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Патент USA US2406340

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Aug. 27, 1946.
2,406,340
L. BATCHELDER I
ELECTRIC GOMPENSATOR
Original Filed Oct. 12,‘ 1939
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INVENTOR.
BY
LAURENCE/BATCHE E£1’
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_ ‘ATTORNEY
Patented Aug. 27, 1946
2,406,340
UNITED STATES PATENT OFFICE
2,406,340
'
ELECTRIC COMPENSATOR
Laurence Batchelder, Cambridge, Mass., assignor
to Submarine Signal Company, Boston, Mass,
a corporation of Maine
Original application 0ctobe1:12,.1939, Serial No.
299,180, now abandoned. Divided and this ap
plication December 5, 1940, Serial No. 368,656
3 Claims.
1
The'present application is a division of my co
pending application Serial No. 299,180, ?led Oc
tober 12, 1939, now abandoned.
(Cl. 177-386)
2
inductances having mutual inductance between
the two parts of their windings, as provided, for
example, by common iron cores as shown.
The present invention relates to electric com
The center taps I8 and I9 lead respectively to
pensators particularly to such as are used for
the inputs of the transformers 28 and 29, the
the determination of the direction of subma
transformer secondaries being connected across
rine sound sources. For this purpose a plurality
the binaural or B-line as shown. The output of
of electroacoustic transducers for producing elec
the B-line is connected to the telephone indi
trical response upon excitation by compressional
cators 36 and 3?. The B-line switch, here shown
waves are mounted at spaced positions in a pre 10 schematically, is more fully described in my prior
determined con?guration.
A wave impulse ar
United States Patents Nos. 2,070,570 and 2,088,580.
riving from a distant source will, therefore, strike
It will now be understood that compressional
the several transducers or receivers at different
wave energy striking the receiving devices I will
instants of time whereby the electrical currents
cause them to produce electrical currents ‘having
or voltages produced by the said devices will 15 a phase difference depending upon the time of
vary in time phase depending upon the angle
arrival of the sound energy at the several receiv
which the direction of the sound source makes
ers. The maximum lines by means of the switches
with the surface upon which the receivers are
make it possible to bring the energy from the
mounted. By progressively varying the phases
individual units of the two groups of receivers
of the several electric impulses so produced in 20 into phase. The energy from the two groups of
such a manner as to bring them all into phase,
receivers is then impressed upon the B-line. The
the direction of the sound source can be deter
energy from the left group of receivers passes
mined by noting the amount of phase variation
through the left portion of the B-line while that
required. For'this purpose adjustable electrical
from the right group of receivers passes through
retardation lines are commonly employed. These 25 the right portion of the B-line.
are frequently divided into two parts, the bi
The maximum line switches comprising the
naural or B-line and the maximum lines. The
brushes I2 and I3 and the auto transformer
present invention relates particularly to a max
I6 for the left line as seen in Fig. 1 and the
imum-line switch.
brushes I4, I5 and auto transformer I‘! for the
The invention will best be understood with
right line make possible substantially perfect mid
reference to the accompanying drawings in
series terminations for both parts of each of the
which Fig. l is a schematic diagram of an elec
maximum lines without the necessity of provid
tric compensator in accordance with the present
ing center taps in the series inductances of the
invention, and Fig. 2 is a development of one of
lines. One of these switches is shown in greater
the maximum line switches in accordance with 35 detail in the development present in Fig. 2. A
the present invention.
portion of the retardation line comprising the in
Referring to Fig. 1, four compressional wave
ductances 9 and the capacitances I 0 is shown for
receiving devices I are shown. These all have one
six different positions of the brushes. The con
lead connected to a common conductor 2. The
tact studs I I connected to the terminals of the
other terminals of the left pair of receivers are 40 inductances 9 and the two movable brushes I2
connected to the input of the left maximum line
and I3 which are connected to the terminals of
3 at 4 and 5, while the right pair of receivers
the auto transformer I6 having the center tap l8
is connected to the input of the right maximum
are shown in their true relative sizes and spaces
line 6 at ‘I and 8. The lines 3 and 6 are electric
which they must have in order that the transi
retardation lines of recurrent sections formed of 45 tions be equally spaced.
inductances 9 in series and capacitances I 0 in
To this end it is necessary that the transitions
shunt as heretofore used in the art. The ends
of each brush from one stud to the next be in
of the lines are terminated by additional capac
stantaneous and that the transitions be equally
itors as shown to provide perfect midshunt ter
spaced as the brushes move along the studs. If
mination. The junction of the series inductances 50 we let the width of the studs be represented by
are connected to contact studs II of the maxi
mum line switches each of which includes a pair
of movable brushes I2, I3 and I4, I5, respectively.
These are connected to the terminals of the cen
S, the width of the brushes by b, and the pitch
of the studs by P, the transitions will be instan
taneous if
b=P_s
(1)
ter tapped auto transformers I 6 and I1, respec 55
tively. The auto transformers are center tapped
In practice it is not essential that the brushes
2,406,340
themselves be made of exactly the correct width
but they can be made wider than the required
value and bevelled at their edges. In order to
make the transitions equally spaced, it is evi
dent from Fig. 2 that
4
both ends of the line are again terminated in a
mid-shunt manner as in position 1.
\
Having now described my invention, I claim:
1. In an electric compensator having an elec
tric retardation line formed of a plurality of re
currentsections of inductive series elements and
capacitive shunt elements, means for effectively
(2), ,
connecting to the electrical center of one of said
inductive elements comprising a center-tapped
where B is the total span of the two brushes.’ 10 auto transformer and means for connecting the
same in, parallel with said inductance element.
Hence
‘
'2. Inpan electric compensator having an elec
tric retardation‘line formed of a plurality of re
(3) '
current sections of inductive series elements and
From Equations 1 and 3 it follows that the 15 capacitive shunt elements, an auto transformer
transitions will be equally spaced if
'
having a’, center, tap and two terminals and
switch means 'for progressively connecting said
terminals to the extremities of one of said in
ductances, then both terminals to the junction
20 between the latter inductance and next adjacent
The progressive position of the brushes as they
inductance, then to the extremities of the last
are advanced over the studs is shown in Fig. 2.
In position lboth brushes l2 and H! are in‘ con
tact with a single stud so that the lead 18 is ef
mentioned inductance and so on.
'
'
3. In an electric compensator having an elec
tric retardation line formed of a plurality of re
fectively directly connected to- the line at the 25 current sections of inductive series elements and
junction of two series elements. Both ends of
capacitive shunt elements, a switch mechanism
the line are thereby terminated in a mid-shunt
including ?rst contact members connected be
tween adjacent series elements, an auto trans
former having a center-tapped Winding, a pair
to the right with the brush l3 in a transition po- -30 of second contact members one connected to
sition between one stud and the next. 'In posi
each extremity of said transformer, means
tion 3 the brush I3 has completed contact with
mounting both ?rst and second contact members
the next stud while the brush’ I2 is still in con
in cooperative relation to each other and so ar
manner.
In position 2 both the brushes have advanced
tact with the preceding stud.
The auto trans
ranged that the space between adjacent ?rst
former I6 is thereby shunted across one of the 35 contact members is the eifective width of each
inductances 9. The center tap l8 is therefore ef
of the second contact members and the total
fectively connected to the center of the element
span of the two second contact members less the
9 whereby both ends of the line are terminated
width of one of them is one half the distance be
in a mid-series manner. In position 4, the
tween corresponding edges of adjacent ?rst con
brushes have moved a further increment to the
tact members, and means for moving the second
right, while in position 5 the brush I2 is in the
contact members relatively to the ?rst.
transition position. In position 6 both brushes
l2 and. I3 are in contact with the next stud and
LAURENCE BATCHELDER.
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