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Патент USA US2408372

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Oct. ‘1, 1946.
2,4083 70
C. M. BURRILL
‘ AUTOMATIC TUNING SYSTEM FOR RADIO RECEIVERS
Filed Feb. 26, 1945
3 Sheets-Sheet -l
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Oct 1, 1946‘,
C_ M_ BURRlLL
2,408,370
AUTOMATIC TUNING SYSTEM FOR RADIO RECEIVERS
Filed Feb. 26, 1943
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Patented Oct. 1, 1946
2,40%,376
UNITED STATES PATENT OFFICE
2,408,370
AUTOMATIC TUNING SYSTEM F03 RADIO
RECEIVERS
Charles M. Burrill, Princeton, N. J., assignor to
Radio Corporation of America, a corporation of
Delaware ;
Application February 2.6, 1943,_Serial No. 477,209
17 Claims. (01. 250--20)
1
Theinvention relates to a method' of and mech
anism for automatically tuning radio broadcast
2
tion, when desired, to establish or revise the ra
dio’s habits.
Basically, the apparatus utilizes a recording me
receivers, and more particularly to a tuning sys
tem‘ which is caused to operate automatically in
dium with a playing time of one week or more,
accordance with and in response to a previously
upon which may be made a record of the re-,
recorded schedule of desired programs.
ceiver’s tunings over a weekly cycle. The reason
One of the main objects of‘the invention is to
for selecting a recording medium capable of ac
provide a method of and apparatus for automati
commodating a weekly cycle is because in the
cally tuninga radio receiver through a sequence
majority of cases programs are broadcast on a
of programsto which it has been tuned in pre 10 weekly. schedule. Some are broadcast two or
vious weeks, in a fashion analogous to memory,
three times weekly, and very few are broadcast
without complicated preliminary selecting oper
daily. However, it will be understood that the in
ations by the user;
vention may be carried out equally as well with
Heretof-ore, pro-set or time tuning arrange
the use of a recording medium having a playing.
mentshaveused‘ elaborate systems of pin jacks 15 time of, only one day, in which case “memory”
or-rows of‘contacts which had to: be set in ad
tuning will be had only for those programs that
vance by-the-user to select the programs to which
occur daily. The record may be telegraphic, that
he wished to listen. Thesehave appeared very
is; it mayv consist of coded impulses. Since in
complex to the user- and have not been very ac~
formation is required only with regard to certain
ceptable commercially. In addition, the e?ort to 20 program units or intervals, for example 15 min
set them each week becomes burdensome and
ute period, the motion of the medium is preferably
they haveifor this-reason fallen into disuse.
discontinuous, that is, it is caused to move in small
Accordinglyit-is an object of my invention to
jumps every 15: minutes just prior to the begin
provide a tuning arrangement which is very
ning of anew. program, by means of a synchronous
simple asrfar as the user is concerned, and which 25 clock,
requires for utilization of its automatic action
The-recording medium preferably moves in a
littleryor nothing-additional to the normal opera;
tion of;a receiving set provided with manual tun
ing. I accomplish thisby- what I have called
“memory tuning” because thatiswhat is believed 30
the user really wants of an automatic tuning
mechanism. He'wants it"to tune in'eautomatically
certainprograms to which he repeatedly listens,
but does not want to be bothered with selecting
in advance his radio schedule for an entire week.
It .isza further object of ‘my, invention to provide
for changing the automatic functioning from week
to‘week by the operation of manual action over
riding the automatic action, without the resetting
closed cycle, in order to avoid the necessity for
disposing of *used recording material and loading
the receiver with new recording material. This
is also desirable in that then the reproducing and
recording means may be located close together
along the path of record travel. However, irde
sirecl a non-cyclic arrangement may be used in
which case the recording material is used only
once and discarded. As a result, it is necessary
that the record he made anew each week, although
there is no need for erasing means. However, I
prefer the cyclic method, because of its greater
convenience to the user. and because it does not
of anyv system of contacts or other additional
action; This is analogous to the building up of a
call for continuing‘expenditures for record mate
rial. In the cyclic method however, the recording
habit by repeated-action, and changing it by re
peated denialthrough will power. Thus, it is a
“willpower.”
material must'be capable of erasure. A suitable
recording method-that may be used is the mag
netic recording on a hardened steel tape, disc,
drum or wire. The recording material must be
driven synchronously in order toprovide accu
According to the present invention the method
whichilfpropose consists of automatically tuning
out cumulative errors, to correspond to the pro
further object of my invention to provide a re
ceiver having. “habits” or “memory” and also
rate timing of ‘recording and reproduction with
the'radio during one week to the same stations (at
gram cyclev desired. This is easily accomplished
given times) to‘which it was tuned the previous 50 with the aid of suitable means, such as a gear
week; and automatically shutting it off for the
drive, from a synchronous clock motor. In the
periods'for which it was-shut off during the pre~
case of recording. on a steel type, suitable means
vious we 5;. There is, provided also a manual con
such as sprockets and sprocket holes may be uti
trol .in order tooverrulethe“memory” operation
lized.
when‘ desired; just as oneis will ought to over 55
As mentioned above, for American broadcast
ing, aprogram cycle of one week is desirable and
rul‘ehislhabit; Thus, the set-upoi- the automatic
action‘ consist'srmerely of. normal manual opera“
ordinarily/would require a relatively long “play
2,408,370
3
4
ing time” for the recording material, that is along
a suitable operating potential to be applied to ter
minals Hi, all of which will be more fully de
scribed hereinafter.
tape, or a large disc. It is a feature of my inven
tion to reduce the physical size of the recording
Also driven with sprocket i5 is a clock indica
material required by moving it intermittently or
discontinuously with time instead of continuously 8.11 tor 20 of the type which indicates the day and
as in recording methods heretofore employed.
the hour at quarter-hour intervals (0, 15, 30, 45),
This can be done without loss of useful perform
a. m. or p. m.
The indicator serves to apprise
the listener of the program in progress by regis
ance because automatic tuning is only required
tering the time it goes on the air. It is also in
during program changes, for example, every 15
minutes. Thus the program record may be moved 10 dicative of the unit portion a to b of the tape
that is e?ective during the program. In order
suddenly and rapidly every 15 minutes on the
that the tape position may be synchronized with
quarter hour. Another feature of the invention
is to make use of this rapid motion to gain sensi
the indicator at all times suitable means (not
tivity in reproduction, by causing the rapid mo
shown) may be provided for moving the tape in
dependently of the shifting relay and the indi
tion of the magnetized tape through a pick-up coil
to induce a relatively large voltage. The inter~
cator.
Part l l is the reproducing head, [2 is the eras
mittent motion desired is obtained by means of
a mechanism similar to the well-known step relay
ing head, and i3 is the recording head. Repro
used in automatic telephone practice, which is
ducing head H is located as near ‘to the leading
actuated by contacts made by the synchronous 20 edge of the region a—b as is convenient, the tape
motion being in the direction shown by the arrow.
clock every 15 minutes. A suitable indicator is
Erasing head l2 follows as close as possible with
provided for the record moving mechanism, so
out causing interference with the independent
that the record may be reset to the correct time
of day and day of the week in case of power failure
action of H and I2. Recording head 13 follows
or other cause stopping the driving clock.
with such a spacing that there is no interference
ent invention in addition to the recording medi
between l2 and 13. The length a—b is so chosen
that the recording made by head 13 does not ex
um or “memory” means above mentioned are
tend appreciably beyond I).
Other elements that are involved in the pres
The section a-b
has been drawn to a much larger scale than the
means for recording on the recording medium
electrical or magnetic indications which consti 30 balance of Fig. 2, for the sake of greater clearness.
Fig. 3 shows an enlarged partial view, approxi
tute a record of the stations tuned in at diiferent
mately to scale, of one form of the pole pieces
times, means for reproducing the record, means
whereby the reproduced record effects the auto
matic tuning of the receiver to the same stations
at corresponding times, and means for erasing
the record when desired to select a different pro
which might be used for the reproducing head I l.
2! are the upper and lower soft iron pole pieces,
arranged on opposite sides of the hardened steel
tape it] for reproducing a transverse recording.
gram or no program. By electrical recording is
meant the process of making electrical or elec
Longitudinal recording might be used if desired,
in which case they would be slightly displaced
from each other longitudinally. The pole pieces
tro-magnetic impressions or indications on a re
cording medium.
'
40 are beveled as shown, to permit the reproduction
The novel features characteristic of my in
vention are set forth with particularity in the
of shorter impulses, and they are backed with
appended claims. The invention itself, however,
"with bolts 23, to prevent Wear on the tape. The
pole pieces 2! are shown in contact with the tape,
but with some loss of sensitivity and resolution
of very short pulses, they may be held away from
the tape forming small airgaps, thus further re
ducing wear on the tape.
Fig. 4 shows the reproducing head I l, with the
both as to its organization and mode of opera
tion together with further objects and advan
tages thereof, will best be understood by refer
ence to the following description taken in con
nection with the accompanying drawings in
which
Figs. 1a and 1b when placed side by side, with
Fig. la to the left, show in schematic form a
complete automatic tuning system according to
non-magnetic pieces 22, fastened for example
complete poles 2l—22 surrounded by the pickup
windings H’, which may be connected in series
(as shown) or in parallel, in aiding phase, and
brought out to terminals 25.
the invention, and Figs. 2 to 7 show details of
construction of certain elements of the "memory”
.
unit.
Before describing in detail the complete sys
tem, there will ?rst be given a description of the
“memory” unit shown schematically in Fig, 1a
and in greater detail in Figs. 2 to 7.
In Fig. 2, it is the magnetic tape upon which CO
considerably broader in the direction of the tape
travel, for here resolution of sharp pulses is not
the record is made. It is driven intermittently, a
the use of airgaps would be desirable in the eras
distance corresponding to that from a to I), just
prior to the beginning of each program interval,
ing head. The airgaps themselves would produce
the desirable effect of smoothing as withvbroad
pole tips, because of the fringing of the ?ux,
The recording head I3 is the equivalent of a
by sprocket l5 engaging sprocket holes in tape
it which is in the form of a closed loop, suitably
guided by roller 16 and other means not shown.
To prevent di?culty due to irregularities in the
spacing of the teeth of sprocket 15, the number
of its teeth should be a factor of the total number a
of program units in the loop or cycle. Sprocket
i5 is driven, either directly or through a gear
train, by ratchet wheel I1 and shift relay [8. Re
lay id is energized just prior to the beginning of
each program interval by means of contacts car
ried on a time-operated control drum which cause
Erasing head 12 may be the same as reproduc
ing head H except that the pole pieces should be
desired, but instead a smooth magnetization or
erasure of previous magnetization. Sensitivity is
not likely to be of much dimculty here, so that
plurality of reproducing heads II juxtaposed
longitudinally, for the purpose of recording a
plurality of pulses of magnetization on the tape
while it is stationary. The number of pulses re
quired depends on the number of stations which
are to be tuned automatically. The pulses should
be spaced as closely as possible without overlap
ping. Fig. 5 shows a graph of the magnetization
of a unit section a—b of the tape for a case with
three pulses. The line 26 represents the zero or
5
2,408,370
6
demagnetized value, and the line 21 at the left
represents the saturated or fully magnetized
value corresponding to no record. The state of
The clock unit actuates the controller drum which
controls the memory tuner and its power supply
for a brief interval at the change from one pro
gram period to the next. The receiver proper is
“on” only when in use. The memory tuning
mechanism turns it “on” or “off.”
'7. The receiver is turned “off” by means of a
magnetization of the tape representing three re
corded pulses is shown by the three dips at the
right. For maximum sensitivity without impair
ment of resolution the pulses should dip down
practically to zero but not beyond.
In order to provide for sensitive recording with
out saturation of thin poles, the arrangement
push-button circuit similar to those for station
tuning, which results in rotating the tuning con
denser to one extreme of its travel, at which posi
shown in Figs. 6 and '7 may be used for the re
tion a cam on its shaft operates the line switch.
cording head. Fig. 6, an end view, shows the poles
The receiver is turned “on” simply by tuning it
either manually or automatically, away from the
“off” position to a station.
they may be enlarged in cross-section and to make
room for the windings 13'. A side view is shown 15
It will be apparent to one skilled in the art, that
in Fig. '7 to make the construction clearer.
many modi?cations may be made in the above
Preferably the recordingpole tips should be
basic functioning, as maybe desired, without de
beveled similarly to the reproducing pole tips as
parting from the spirit and scope of the inven
shown in Fig. 3 so as to record as sharp pulses
tion. For example, additional controls may be
2i’ fanned out in rotation to gain space, so that
as possible and so save on the length of the tape 20 provided so that the user may change at will var
required. For the same reason the pole pieces
ious steps in the memory process, i. e. the repro
should preferably be in contact with the tape dur~
ducing may be prevented, the time of erasure or
ing recording, although they may be raised by
recording may be changed, or one or both. of these
steps may be prevented, etc.
The main “Power unit” for the receiver
any suitable mechanism while the tape is moved,
to save wear on the tape. If the poles are left in
the
“Push button unit” may be similar to, or identi
cal with such parts of modern electric motor
tuned radio broadcast receivers, as for example,
the RCA 911K receiver, and are shown only to
contact while the tape is moved, non-magnetic
blocks 22 should completely ?ll the spaces be
tween the beveled pole tips so that a' single smooth
surface is presented to the tape on each side,
to minimize wear.
The plurality of windings l3’ around the poles
30 indicate the complete operation of the tuning and
21’ of the recording head are brought out to a
plurality
3!}, etc. Although
of pairs not
of recording
shown, each
terminals
of these 28,
wind
ings is to be considered to include the winding
around the corresponding lower pole, not shown.
The complete systemof my invention, shown
schematically in Figs. la and lb when placed side
by side, consists of the following units which are
identi?ed by legends: (a) Clock unit, (b) Con
troller unit, (0) Memory unit, ((1) Memory power
unit, (a) Memory tuning unit, (f) Tuning mot-or
controls. The “Tuning motor unit” includes the
usual reversible motor M, contact making selector
disk A and station-setting contacts all, al,
a2 . . . a'l, as employed in the RCA QllK re
ceiver, and other parts to be described later.
The motor M drives the tuning condenser Cr and
its shaft S upon which are mounted, in addition
to selector disk A. the disks 3, C, and D, the func
tions of which will be described later. All. other
parts of the receiver proper are conventional and
need not be shown.
Push-button operation of the receiver is as
follows: When one of the station buttons ! to
l is actuated, it completes a circuit through the
unit, (g) Receiver power unit, and (.12.) Push hut
ton unit.
Brie?y the basic operation of the disclosed ~ern~ 4. corresponding station-setting contact al to a'i,
one-half of the selector disc A, which. is con
bodiment of my invention is as follows:
nected to one side of the motor ?eld coil, and
1. At the beginning of each program period, the
receiver is automatically tuned in accordance
the
example,
secondary
if push-button
of the power3 transformer
is depressed,(53.a cir
with the memory record. This is done regardless
cuit
is
completed
from
one
side
of the secondary
of how the set was tuned for the just preceding
program
or of whether it was “on” or
“on.” If necessary, it turns the set “on” .or “off,”
a blank memory record giving the latter result.
2. Immediately after the memory record has
of power transformer 43 to one terminal of mo
tor M, from another terminal of motor M to one
side of disc ,A, thence through contact at to
push-button 3, thence through back-contact S3
of the “Manual” push~button, through circuit
lead 88 to contact '53, segment 56, and contact
‘l2 of the controller unit, thence to ground and
a new memory record is made of the station to
the other side of power transformer 133. This
which the receiver is then tuned. If the receiver
energizes the motor, and the rotor is pulled‘for~
is “oil” or has been tuned manually awayfi‘om
any push-button position, no record is made.
60 ward, engaging with the gear train (not shown)
4. The sequence is automatically self-perpetu
that drives the shaft S, tuning condenser CT
performed its function (1) above, it is erased.
Just before the end of the program period.
ating but the user can change the conditi i
push-button
repeated for station,
any given
or “off.”
program
by tuning
period to
to that
station or turning the receiver “off” during the
given period. Of several stations or “o?” tried,
the last is the one that will be repeated.
5. The receiver has a plurality of push-buttons.
one for “Manual” tuning, an “off” button, and
one for each station to be automatically tuned~in
There are no controls added by the memory tun
ing feature, except a time setting adjustment.
which must be made if the power goes off.
6. The master clock and the transformer ven
ergizing the tuning motor are on all ‘the time. 7
and selector disk. The condenser and disc ro
tate until the insulation line comes under the
particular station-setting contact which in the
example given is at, thereby breaking the motor
circuit. Inertia carries the insulation line past
the station-setting contact which th maize-s con»
tact to the other half of the disc. This completes
the circuit to the other side of the motor ?eld
coil, causing the motor to reverse.
floating
flywheel (not shown) is still turning in‘ the origi
nal direction and therefore slows down the re
versal movement of the motor; as a result the
selector disc is moved slowly back until the in
sulation line is under the station-setting contact,
2,408,370
7
8
when the circuit is broken and the tuning mech
T1 and T2, are sufficient to cause ionization of
whichever tube of the pair is not already ionized.
The surge resulting from the ionization of one
tube of the pair puts out or de-ionizes the other
anism stops. For a more detailed description
of the receiver automatic tuning mechanism de
scribed above and its manner of operation, ref
erence is made to the U. S. Patent No. 2,204,065
one.
of Beizer and Newman.
transfers as it were the ionization from one tube
The “Memory unit” previously described in
cludes the magnetic tape Hi which is moved rap
idly, one section at a time, every time the shift
relay i8 is excited. When it moves, electrical
impulses are generated in the windings H’ of
the reproducing head H, in accordance with the
state of magnetization of the tape, recorded at
the end of the earlier corresponding program
period, say One week previously. After the tape 15
passes the reproducing head it passes the eras
ing head l2 whose windings I 2' carry a steady
magnetizing current, so that the old record is
erased and the tape section is left uniformly mag
netized. The section of the tape comes to rest 20
Thus each pulse impressedv on the pair
to the other. Similarly the pair T1, T2 is so cou
pled to the pair T3, T4 that every time T1 be
comes ionized the ionization in pair T3, T4 is
transferred from one tube to the other.
T6 is transferred. Thus as successive pulses are
received, the following conditions exist, + indi
cating the ionized state, and —— indicating the
de-ionized state.
netic record is made consisting of a number of
pulses, depending on the number of windings E3’
in the recording head that are then excited. This 25
is determined by the position of the tuning con
denser and the contacts cl to 06 cooperatively
related to the disc C in the “Tuning motor unit.”
The “Memory tuning unit” includes a vacuum
'
Tube
T1 T2 T3 T4 T5 To
under the recording head l3, where, just prior
to the end of the program period, a new mag-
Like
wise pair T3, T4 is coupled to pair T5, T6 so that
every time T3 ionizes the ionization in pair T5,
Start _________________________________ __
+
_
+
_.
+
._
After 1 pulse ______ _; _________________ __
After 2 pulses ________________________ __
+
_|_
_
+
_
__
+
+
+
_
_
After
After
After
After
3 pulses___
4 pulses___
_
+
_
+
-_
+
+
_
.|_
_
_
+
_|_
_
_
._
_.
+
5 pulses___
6 pulses___
+
+
_
+
+
_
_+
+
_
_
+
+
_
After 7 pulses ________________________ __
After 8 pulses ________________________ _,
+
+
tube ampli?er 3B for amplifying the impulses pro 30 It will be noted that after 8 pulses the cycle re
duced at the “reproduce” terminals 25 of the
peats itself, that only after 8 pulses are tubes T2,
memory unit. It in turn drives the six tube
T4 and Te de-ionized, and that only then is the
“three dial” “scale of two” counter circuit includ
counter restored to its proper starting condition.
ing the three pairs of thyratrons, Tl, T2; T3, T4;
Use is made of this, as follows: D. C. power is
and T5, T6. Such counter circuits are Well known
applied to the step relay 3'! and to its latching
and are described, for example in a paper by
coil 46, through the contacts 38’ of lockout relay
C. W. Wynn-Williams, published in the Pro
33, after all the pulses have been received from
ceedings of the Royal Society, see. A, vol. 135, p.
the magnetic tape, say for Example 3. In this
312 (1932). This circuit “counts” the number
instance tubes T2 and T4 are ionized and lock
of pulses following each other in rapid succes 40 out relay 38 is actuated. The are current of one
sion generated by the magnetic tape and holds
tube is sufficient to operate it. The step relay
37 is provided with contacts 4! which open mo
the step relay 3? which initiates actuation of the
mentarily at each step and keep it “stepping” as
automatic tuning mechanism. ,It would be diffi
long as power is applied. However, each‘ step
cult to make the step relay fast enough to oper he. ivi applies a pulse to the counter thyratrons T1 and
ate from the pulses directly, so they are in ef
T2 through the amplitude adjusting potentiom
fect stored by the counter circuit and then given
eter 42. When the sum of the pulses received
out at a slower rate suitable for the step relay
from the magnetic tape and from the step relay
to follow.
equals 8, tubes T2, T4 and T6 are de-ionized again,
The counter circuit operates as follows: First,
thelockout relay 38 drops back and the step relay
from a completely de-energized condition, the
3? is locked out until the next cycle of operation.
proper starting condition must be obtained, ready
Thus, if 3 pulses are received from the tape, the
for the receipt of the impulses. For this start
movable contact arm 3'!’ of the step relay will
ing condition one and only one thyratron of each
advance 5 steps from its home or “off” position
pair must be ionized, say tubes T1, T3 and T5. i to the contact No. 3 and then hold its position.
The bias voltage normally applied to all of the
The contact N0. 3 is connected to contact 113 in
tubes is great enough to prevent the start of
the “Tuning motor unit,” so that, after the step
ionization. Thus the starting condition is brought
relay has ?nished its stepping, the circuit of the
about by the following switching operations by
tuning motor will be completed through contacts
the “Controller unit.” First, the normal bias
at the “Controller unit,” and the tuning motor
is removed by connecting the grid returns to
will tune the receiver to station No. 3 correspond
their grounded cathodes. Then plate potential
ing to the three pulse signal transmitted from
is applied to tubes T1, T2 and T5, which there
the memory tape. When this tuning is ?nished
upon ionize. Next normal bias is restored, which
the latch of the step relay is released and the
the information until it can be used to control
of course does not stop the ionization of these
tubes, but does prevent the ionization of tubes
T2, T4 and T6 when, as a ?nal preparatory step,
plate voltage is applied to these tubes in series
with lock-out relay 38. The counter circuit is
now ready to receive the pulses from the “ rem
ory unit.”
The bias on tubes T1 and T2 is so adjusted by
means of the tap on potentiometer 39 that the
positive pulses produced after ampli?cation by
tube 36, which are impressed on the grids of tubes
' contact arm 3'5’ returns to the home or “o ” po
sition, ready for another tuning operation. As
soon as the stepping operation is ?nished plate
voltage is removed from the counter thyratrons.
If no pulses are received from the tape, the step
relay will not advance but will remain in the
home or “off” position. In the corresponding po
sition of the condenser shaft S the cam disk D is
positioned to have its cam 44 open the switch 45
thereby disconnecting the power source from the
75 v“Receiver power unit.”
2,408,370
10
Any number of pairs of thyratrons may be used
in the counter circuit, depending on the number
of stations to which it is desired to tune, thus if N
is the number of pairs of thyratrons, 2N is the
number of positions which may be used on the
step relay.
the “off” position, the conducting strip of disk B
willnot be under a contact and no record will
be made.
I prefer to control all the memory tuning oper
ations by means of 2. “Clock unit” and a “Con
troller unit.” The “Clock unit” consists of a
The “Tuning motor unit” includes the power
transformer 43 which is excited all the time the
~-clock'lii driven by a master synchronous motor
.43 which is energized continuously from the
equipment is “plugged-in” and which supplies
power supply source over the line conductors 49.
power to the reversible tuning motor M. On the 10 The clock motor through suitable means closes
the energizing circuit 551 of the drum motor 5!
tuning condenser shaft S driven by the motor M
for a short time just before the end of each
are the four disks A, B, C and D, all mounted in
program unit when the memory tuning opera
?xed and equal phase, as shown in the diagram.
tions are to be accomplished. Closing this cir
Disk A is the station selector disk commonly used
cuit releases the controller unit drum, which
in motor tuned receivers and consists of two semi
circular conductive segments, separated by an
then is ‘driven one complete revolution and then
insulating strip, each segment being connected
to one of the alternate o1‘ reversing windings of
motor M. Disk C is the same as disk A, while
disk B is the reverse, that is, it consists of two .
insulating semi-circular segments with a con
ducting strip therebetween. Disk D carries on
its periphery a simple mechanical earn it which
operates the “on—oif” switch £15 to “off” at one
end of the condenser travel.
Stationary contacts all, at, a2 . . . a"! slide on
disk A and are connected to the “Push button
unit” and to the contacts i to ‘l and “off” asso
ciated with the step relay of the “Memory tuning
unit.”
Similar contacts bi, b2, b3 . . . b7 slide
on disk B and are connected together and to one
of the windings of the recording head 13 of the
“Memory unit” and to one of the segments of
disk C.
Simiiar contacts cl, c2, of} . . . cii slide
on disk C and connect each to one of the remain
ing six windings on the recording head. Corre
sponding contacts of each set, such as M, hi and
cl, at, B2 and c3 etc. are ?xed in phase relative
to each other, that is in the same phase, but they
may be adjusted together as a unit to correspond
to the tuning point of any particular station
desired.
Contact all on disk A is ?xed at one end
of the tuning condenser travel corresponding to
the position of the “on” switch operated by disk
D. A contact on disk B corresponding to all and
contacts on disk C corresponding to all and al
are not needed and are therefore omitted.
When one of the contacts cad-a5, a2 . . . a7 is
energized, either from the “Push button unit” or
from the step relays‘? in the “Memory tuning
unit,” the motor M will operate, as previously
described, to drive the tuning condenser in the
proper direction until the insulating strip of disk
A falls under the energized contact thereby stop
ping the motor. Thus the station corresponding
to the energized contact is tuned in, or the “oif”
switch 45 is operated if the “on” push-button
was actuated, by the usual method of motor
tuning.
A conductor 46 is connected between the con
ducting strip of disk 3 and a brush contact 51' in
the “Controller unit.” When the circuit which
includes this record power brush contact is ener
gized by the “Controller unit” just prior to the
end of a program period, provided one of the
contacts bl, b2 . . . bl is over the conducting
strip of disk B, one, two or more windings in
the recording head 23 will be energized, depend
ing on the number of 0 contacts that happen to
be on the right-hand half of the disk C. Thus if
station l is then tuned in, one pulse will be re
corded on the magnetic tape, 2 pulses for station
‘2, etc. If the receiver has been tuned manually
to a position between the push-button station
positions or either manually or automatically to
stops until released again by the clock at the
‘end of the next period. In order that the releas
ing circuit 56 may be energized accurately at the
proper time it is provided with two switches Sm
and Sp connected in series, one of which, Sm for
example, is closed ‘brie?y by a cam C1 once every
minute and the other of which, Sp, is closed brief
ly by another cam C2 once every program or 15
minute period. The cams C1 and C2 are riven
by the clock mechanism, preferably by the “sec
onds” and the “minutes” wheels respectively.
Thus the drum motor energizing circuit may be
closed with an accuracy of a very few seconds.
The “Controller unit” includes a rotary drum
~52 which for simplicity of illustration is shown in
Fig. lb as a development of the drum surface.
The controller drum is provided on its surface
with a plurality of conducting inset surfaces or
segments 53 to 5'1, the various functions of which
will be described later. For purpose of explana
tion the drum surface is marked oiT into longi
tudinal, parallel spaces corresponding to arbi
trary time intervals, identi?ed by the numerals
from 0 to 15 appearing at each end of the de
veloped drum surface. It is only necessary that
the drum be active, that is, make its single rev
olution, during about 30 seconds, beginning just
prior to the termination of one program period
" and ending just after the start of the next pro
gram period. It will be understood therefore
that the time intervals from 0 to 15 have refer
ence to the time of drum rotation. The various
lengths of the drum segments in the direction
of travel are shown to be equal to, or multiples
of, a unit time as represented by any one of the
equal parallel spaces. It is not necessary that
such be the case, since their lengths are deter
mined only by the time during which the respec
tive circuits they control are required to be oper
ative, and are merely a matter of design.
The synchronous motor 51 serves to rotate the
drum by way of a shaft 58. A cam C3 mounted
on or driven from the motor shaft 58 actuates
the switch Cc to open the circuit of motor 51
when the drum is in the O or starting position.
The contacts of switches Sm and Sp are in par
allel with the contacts of switch Sc so that once
the drum is started away from the 0 position it
continues to turn, regardless of the condition of
the clock contacts, until it reaches the Q posi
tion again, when it stops until released again by
the closing of the clock contacts for the next pro
gram period.
Cooperating with the controller drum 5?. are
a plurality of brush contacts E5l—'l5 which ride
on the drum surface and which are adapted, by
contacting with the drum segments in a prede
termined sequence, to individually close certain
operating circuits as will be explained herein
11
2,408,370
12
after. The brush contact BI is connected by way
cording head windings It" in accordance with
of conductor '15 to the movable contact of switch
the position of the tuning condenser at that
33’ which is under the control of lock-out relay
instant, thus making a new memory record on’ a
38. Brush contact 62 is connected by way of
section of the magnetic tape that had been previ
conductor ‘ii to the latch winding 40. Brush con
ously erased.
tact 83 is connected through conductor 18 to one
3. The excitation of the recording windings is
terminal of the lock-out relay 33, the other ter
removed, and by means of the left-hand portion
minal of which is connected through conductor
of drum segment 5E bridging the brush contacts
‘59 to the plates of tubes T2, T4 and Te. Brush
69, ‘it (bias and ground) the bias lead 84 from
contact 6!; is connected through conductor 80 to
the thyratrons in the counter circuit is connected
the plates of tubes T1, T3, T5 and ampli?er 3B.
to ground preparatory to putting the counter
Brush contact 65 is connected through conduc
ready for operation.
tor M to one terminal E9 of the shift relay I8,
‘l. The grids .of the thyratron tubes continue
the other terminal of which is connected to
to be grounded, and D. C. potential is applied to
ground. Brush contact 66 is connected through 15 the plates of counter tubes Tl, T3 and T5 due
conductor 82 to the +3 terminal of the “Memory
to the connection, through segment 53, between
power unit.” Brush contact 6'5 is connected
the brush contacts 66, 64 (+B and plate #I).
through conductor 156 to the conducting strip of
5. In this position of the drum the brush con
disk B. Brush contact 68 is connected through
tacts $8, 59 (—C‘ and bias) are bridged by seg
conductor 83 to the —C terminal of the “Memory 20 ment 515 so that the bias on the counter tubes is
power unit.” Brush contacts 69 is connected
given its normal negative value.
through conductor 84 to the control grids of the
6. The brush contacts 56, G3 (+B and plate
several thyratron tubes. Brush contacts 10 and
#2) are bridges by the segment 53 to permit
‘F2 are connected through conductor 85 to the
D. C. potential to be applied to the plates of
ground terminal of the “Memory power unit” and
counter tubes T2, "rs and T6. The counter cir
through conductor 86 to the grounded cathodes
cuit is now ready to receive pulses.
of the tubes included in the “Memory tuning
'7. D. C. power is applied to shift relay l8 due
unit.”
rush contact ‘i! is connected through
to the brush contacts 5%, 65 (+B and shift)
conductor 3? to the movable arm 37' which is
being bridged by the segment 53. Energization
under the control of the step relay 3T. Brush 30 of the relay l8‘ will cause the rapid movement
contact 13 is connected through conductor 88 to
of the magnetic tape a distance corresponding
' the upper contact 89 associated with the “Man
to one program period, and the generation in
ual” push-button of the “Push button unit.”
reproducing windings H’ of a number of pulses
Brush contact ‘it is connected through conduc
corresponding to the memory record on the tape
tor 9B, the primary 9| of the power transformer 35 made the Week before. The pulses are received
for the “Memory power unit” and conductor 92
and counted by the counter thyratrons as de
to one sideof the power lines 49, the brush con
scribed previously.
tact 15 being connected to the other side of the
8. D. C. power is removed from shift relay i8
power line.
and applied, by way of the segment 53 and the
The functioning of the “Controller unit”
brush contacts 5%, {i2 (+B and latch), to the
switching as well as the operation of the entire
latch winding 4!] of the step relay 37, which is
system will be understood from the following:
now ready to “step.”
'
0. Normal or starting position. In this posi
9. D. C. power is now applied, by way of the
tion of the drum, the segment 55 will bridge the
segment 53 and the brush contacts 66, BI (+B
brush contacts "i2, ‘i3 (push-button and ground),
and step), to step relay 3'! which then steps until
thereby energizing the “Push-button unit” and
de-energized by the falling out of lock-out relay
providing for push-button tuning at all times
38 signifying that the counter cycle has been
when the memory tuning apparatus is not in
completed. The latch winding 40 permits the
operation.
7
step relay 3'! to hold its arm 3'?’ in the position
1. In this position of the drum and during the
to which it has been stepped.
entire rotational period thereof between the be
10. The counter circuit, having thus served
ginning of time interval i and the end of time
its purpose, is now de-energized in steps. First,
interval E5, the segment 51 will bridge the brush
the segment 53 is moved out of contact with
contacts 14, 15 (line and line), permitting power
brush contact '63 (plate #2) to remove the plate
to be supplied from the A. 0. power lines 49 to
potential from thyratrons T2, T6 and T6, thus
the “Memory power unit.” This power unit is a
insuring against unwanted operation of lock-out
recti?er-?lter combination of the usual sort for
relay 38 and the giving of step relay 3'! an ex
supplying plate and bias voltages for the tubes
traneous step.
in the “Memory tuning unit,” A. C. heater Voltage
11. Next, the segment 53 is moved out of con
for these tubes, and D. C. for operating the sev 60 tact'with brush contact 64 (plate #I) to remove
eral relays, erasing and recording windings in
plate voltage from thyratrons Tl, T3 and T5.
the “Memory unit” and in the “Memory tuning
The cycle of operation that has transpired up
unit.” As soon as it is switched on and oper
to this point will have taken place just prior to
ating, it excites the heaters with A. C. through
the termination of a given program period. The
the secondary 93 and the erase windings l2’
succeeding steps in the cycle, now to be ex
with D. C. by way of the conductor 913, without
plained, occur during the ?rst few seconds of
the interposition of any switches.
the next program period.
2. Segment 56 having been moved away from
12. By movement of the segment 54 out of
underneath the brush contacts 12 and ‘i3, ener
contact with brush contacts 68, 69 (—¢C and
gization of the “Push button unit” is removed so
bias), bias is removed from all the counter thrya
that it cannot be operated to interfere with the
Vtrons which are now entirely inactive except for
memory tuning operation. Simultaneously, the
their heaters which are still excited. By move
lower left-hand portion of segment 53 will bridge
.ment of the segment 54 out of contact with brush
the brush contacts 66, 6'! (+B and record power),
contact 6! (step), D. C. power is also removed
permitting D. C. power to be applied to the re-' 75 from the conductor ‘I6 leading to the movable
2,408,370
14
contact of the ‘pair 38' associated with lock-out
relay 1-38.
‘Bridging-of thebrush contacts ‘ii, iii (memory
ceiver ‘in accordance with said predetermined
schedule.
2. The method of automatically controlling the
operation of a radio receiver according to a pre
determined schedule, which consists in ?rst man
ually operating the receiver to tune in a plural
'tune-and'ground) by the segment 55 causes the
motor circuit to be'completed, thus exciting the
tuning motor M which .tunes the receiver to the
station corresponding to the number of pulses
ity'of stations insaccordance with said schedule,
received fromv the memory record. If the memory
causing during the reception period of ‘each man
record is blank, the receiver is turned off.
uallytune‘d-in station the automatic production
13. After-the tuning is?nished, the motor cir~ 10 of -a characteristic electro-magnetic recording
cuit is'broken by the removal of segment 55
which is'different for each tuned-in station, and
from underneath the brush contacts ‘it, ‘H.
thereafter causing said electro~magnetic record
14. ‘D. Cipower is removed from the latch wind~
ings to automatically control the‘ operation of the
ing 4i.‘ associated with step relay 3i, by break
receiver in accordance with'said predetermined
ing contact between segment '53 and brushes 62,
166 (latch and +B), thus permitting the movable
‘contact '3 ’ to return to its home or “off” posi—
tion, ready for the next tuning.
"15. Energization is reapplied by the segment 55
to the “Push button unit” through the brush
contacts i2, it‘, now that the memory tuning
is ?nishedfor another program period, so that
‘push button tuning is again available.
‘0. Contact between segment 5? and brush con
tacts 1'4, 15 (line and line) is broken, causing ~
A. C.-excitation to be removed from the “Memory
schedule.
3. The method of automatically controlling the
operation of aradio receiver in accordance with
a schedule determined by previous manual oper
ation of the receivenwhich consists in automat
icaily making an electro-magnetic record corre
sponding to said previous manual operation, and.
thereafter causing the record to automatically
control the operation of the receiver in accord
ance with the recorded schedule.
4. The method of automatically cyclically-tun
ing a radio receiver to receive'the same program
power unit,” removing heater excitation from the
which is broadcast at regular intervals, which
tubes in the “Memory tuning unit” and D. C.
consists inelectro~magnetically recording at the
.from the erase windings l2’, ‘and putting every
close of the program an indication correspond
thing ~back to the normal or starting position. 30 ing to said received program, causing the re
The cam 503 on the controller driving motor shaft
corded indication to be ineffective until the next
opens the switch Sc, stopping the controller drum.
interval whenthe program is to be transmitted,
The clock contacts are already open, and the
utilizing the recorded indication just prior to said
entire memory tuning apparatus is shut down,
next interval to tune the receiver to said program,
awaiting the closing of the clock contacts just
then voiding the just used recorded indication,
‘prior ‘to the end of the next program period.
and electrov-magnetically recording at the close
Only the clock, the tuning transformer 153 and
of said next interval another indication corre
the set proper (if in operation only) remain
sponding to the program for use to tune the re
excited.
'
ceiver at the next succeeding interval.
It is to be noted that the lock-out relay 38
5. Tuning mechanism for a radio receiver
should be slow enough in action so that it will not
adapted to-automatically tune in a desired broad
casting-station at recurring time-spaced inter
follow or chatter with the action of the individual
thyratrons in counting the pulses from the
vals, comprising an electrical recording medium,
memory tape, but will pull up promptly after they
means for electrically automatically recording on
‘have all been received, before the controller unit “ said recording ‘medium during reception from
lapplies'power through brush contact 6! and con
said station an indication corresponding to the
ductor l‘lfi'to'the contacts 38' of the lock-out relay
station, a timing device for actuating the record
"38 and the step relay 3?. Likewise the lock-out
ing medium to enable the recorded indication to
relay 38 must be faster in dropping out than the
be effective at the next recurring interval, and
“steps” of step relay 3? so that the step relay 50 means actuated at the said next recurring inter
does'not get in an extra step after it should have
val in response to said effective recorded indica
tion for automatically tuning the receiver to the
been “locked out'by the opening of the contacts
desired station.
‘38’ "by the look-out relay 38.
'6. Tuning mechanism for a radio receiver
While I have shown a particular embodiment
of ‘my invention, it will of course be understood " adapted to automatically tune in a desired broad
casting station at recurring timenspaced inter
that I do not wish to be limited thereto, since
vals, comprising an electrical recording tape,
various modi?cations may be made both in the
means for electrically automatically recording on
circuit arrangement, in the instrumentalities,
said tape an indication corresponding to the sta
and in the mechanical construction employed
tion each time the same is received, a timing de
without departing from the spirit and scope of
vice for actuating the recording tape to enable
my invention as set'forth in the appended claims,
the recorded indication to be effective at the next
and I contemplate by the appended claims to
recurring interval, and means actuated at the
cover any such modi?cations as fall within the
said next recurring interval in response to said
true spirit and scope of my invention.
65 effective recorded indication for automatically
What I claim is:
tuning the receiver to the desired station.
‘l. The method of effecting the automatic tun
7. Tuning mechanism for a radio receiver
ing- of a radio receiver to selected stations accord
adapted to automatically tune in a desired broad
ing to a predetermined schedule, which consists
casting station at recurring time-spaced inter
inrcausing during the reception period of each 70 vals, comprising an electrical recording tape,
means for electrically automatically recording on
tuned-in station the automatic production of a
said tape, during the ?nal portion of the recep
‘characteristic electro-Inagnetic recording which
tion period of the station each time the same is
is. different for each tuned-in station, and there
'after'causing said electro-magnetic recordings to
received, an indication corresponding to the sta
automatically ‘control the’ operation of the re
tion, a timing device for actuating the recording
15
2,408,870
16
tape to enable the recorded indication to be ef
fective at the next recurring interval, and means
to the stations tuned in by the push-buttons, said
stations being identi?ed by different numbers of
impulses, and means operative at corresponding
actuated at the beginning of the said next re
curring interval in response to said effective
recorded indication for automatically tuning the
receiver to the desired station.
8. The combination with the tuning device of
pulses and causing the reproduced impulses to
operate the electrically-operated receiver to tune
a radio receiver, of means for automatically ac
tuating the tuning device to tune in a sequence of
to the previously actuated push-buttons.
14. The combination with the tuning device of
future times for reproducing the recorded im
in in sequence the several stations corresponding
broadcasting stations at predetermined future 10 a radio receiver, of mechanism for automatically
times, said actuating means comprising a mag
netic recording wire, means for sequentially au
tomatically recording on said wire, during the re
ception of said stations and for use in the future,
actuating the tuning device to tune in a sequence
of programs which are broadcast at regular in
tervals and to repeat said sequence as often as
magnetic indications which correspond respec
tively to said stations, a timing device for actuat
ing the magnetic recording wire, and means suc
cessively actuated at said predetermined future
times, in response to the respective recorded in
dications, for operating the tuning device actu 20
mechanism comprising electrical means for driv
ating means to tune in said sequence of stations.
9. The combination with the tuning device of
a radio receiver, of means for automatically actu
ating the tuning device to tune in a sequence of
programs which are broadcast at regular inter 25
vals and. to automatically repeat said sequence
as often as desired at other future times, said ac
desired at other future times, said actuating
ing the tuning device to selected predetermined
positions corresponding to the desired programs,
electrical recording means including a magnetic
tape upon which there are sequentially recorded,
during the receipt of said programs and for use
at said future times, electrical impulses corre
sponding to said programs, means for imparting
a step-by-step movement to the magnetic record
ing tape, means for reproducing the recorded im
pulses and for causing the reproduced impulses to
actuate the tuning device driving means, and
tuating means comprising electrical recording
mechanism including a magnetic tape upon which
there are sequentially recorded, during the re
control means operative to control the sequence
of operation of said several means.
15. The combination with the tuning element
of a radio receiver, of means for automatically
ceipt of each program and for use at said future
actuating the tuning element to selected positions
times, electrical impulses corresponding to that
corresponding to predetermined stations, means
program, a timing device for moving the magnetic
movable with the tuning element for generating a
recording tape, and program selecting means suc
number of impulses corresponding to the sta
cessively actuated at said future times in response
tion to be tuned, means for recording said im
to the recorded electrical impulses for operating
pulses, means for reproducing the recorded im
the tuning device actuating means.
pulses, means operated in response to the repro
10. The combination with the tuning device of
duced impulses for actuating the tuning element
a radio receiver, of means for automatically ac
to a selected position corresponding to the num
tuating the tuning device to tune in one of a plu 40 ber of impulses, and control means operative to
rality of predetermined stations, means for
control the sequence of operation of said several
recording electrical impulses, means movable
means.
with the tuning device for determining the num
16. The combination with the tuning element
ber of impulses to be recorded by the recording
of a radio receiver, of means for automatically
means, said predetermined stations being identi
actuating the tuning element to selected posi
?ed each by a different number of impulses, and
tions corresponding to predetermined stations,
a timing device for actuating the recording means
means movable with the tuning element for gen
and the‘ tuning device actuating means to tune
erating a number of impulses corresponding to
in the station corresponding to the number of
the station to be tuned, means including a mag
impulses recorded by the recording means.
netic tape for recording said impulses, means for
11. The combination with the tuning device of
reproducing the recorded impulses, means in
a radio receiver, of means for automatically ac
cluding an impulse counter operated in response
tuating the tuning device to tune in one of a plu
to the reproduced impulses for actuating the tun
rality of predetermined stations, means movable
ing element to a selected position corresponding
with the tuning device for generating a number of i to the number of impulses, and time-controlled
, impulses corresponding to the station to be tuned,
means adapted to e?ect the operation of said
means for recording said impulses, means for re
several means and to control their sequence.
producing the recorded impulses and causing the
reproduced impulses to operate the tuning device
actuating means to tune in the station corre
sponding to the number of recorded impulses.
12. The combination with an electric motor
tuned push-button radio receiver, of means for
automatically recording a number of impulses
corresponding to the station tuned in by any one
of the push-buttons, and means operative at a
corresponding future time for reproducing the
recorded impulses and causing the reproduced
impulses to actuate the electrically-operated res
ceiver to tune in the station corresponding to. the
previously actuated push-button.
13. The combination with an electric motor
17. The combination with the tuning element
of a radio receiver, of means for automatically
60
actuating the tuning element to selected posi
tions corresponding to predetermined stations,
means movable with the tuning element for gen
erating a number of impulses corresponding to
the station to be tuned, means including a mag
netic tape for recording said impulses, means for
reproducing the recorded impulses, means includ
ing an impulse counter circuit operated in re
sponse to the reproduced impulses for actuating
the tuning element to a selected position corre
sponding to the number of impulses, a source of
power supply for energizing said several means,
and time-controlled means including a commu
tuned push-button radio receiver, of time-con
tator drum operative to control the operation of
trolled means for automatically recording suc
said several means in a predetermined sequence.
cessive numbers of impulses which correspond
CHARLES M. BURRILL.
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