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Патент USA US2411190

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NOV. 19, 1946.
M, BROWN
2,411,190
FREQUENCY RESPONSE COMPENSATING MEANS
Filed Sept. 14, 1944
F117. 1.
INVENTOR.
E4,
221
a
—
'
BY
MRS/Mu B/eanw
‘
Arr):
Patented Nov. 19, 1946
2,411,190
UNITED STATES. PATENTQ- OFFICE '
FREQUENCY’ RESPONSE COMPENSATING ‘
.
MEANS
Marshall Brown, Chicago, 111.
Application September 14, 1944, Serial No. 554,103
14 Claims. (Cl. 179-1)
2
The present invention relates to means for
a piezoelectric or crystal phonograph pickup.
,
' People who are hard of hearing have diiferent
A is similarly connected to a tube 6 in the partial
diagrammatic showing of Fig. 3.
1
My invention comprises the use of a potené
tiometer 7 having an adjustable or sliding con
tact 8, with the potentiometer connected at an
end thereof via conductor 9 to a limiting resistor
Among the objects of ‘the invention is to provide
nected to the microphone 4 and the sliding contact
adj‘ustably controlling or varying the frequency
response of any audio ampli?er and more particu
larly one using a piezoelectric unit such as a piezo
electric or crystal microphone in a hearing aid. or
ill which, in turn, is connected via conductor H
types of hearing loss and this loss as shown by
to the grid circuit part [2 of the grid 5 and micro
the audiogram or chart of their threshold‘ ‘of
hearing may indicate, in one person, a loss of the 10 phone :3, and with the potentiometer connected
at the other end thereof via conductor 13 to a
high notes of the audio frequency range; in
condenser l4 and thence via conductor I5 to the
another person, a loss of the low notes thereof;
grid circuit part [6 of the grid I‘! of tube I (Fig. 1),
in ‘still another person, a loss in the middle or
or to the plate circuit part I 8 of the plate- l9.
intermediate frequency; and in still a further
of
the tube 2 (Fig. 2), or to the screen grid‘ 26
person, a straight line loss of all ‘the notes for 15
(Fig. 3). Suitable grounds 2! and ‘22 are con
the extent of the audible range.
'
8 for completing the. circuit.
a novel device for adjusting the frequency re~
sponse so as to give a correction for the particular
tion is shown inconnection with a piezoelectric
or crystal phonograph pickup 23 which is con—
nected to ground on one side and via a’conductor
I2-24—l_6 to the grid ll of the tube"! on the
type of loss desired to be'corrected or compen
sated for' and particularly to make a‘very gradual
or 'very closely controlled adjustment by'g?ne
gradations'or incremental changes which will
other side. With this conductor is shunted a
potentiometer ‘! which‘ is connected at an end
be substantially smooth as distinguished from a
jump or step adjustment or change; ‘
‘
Other objects, advantages, capabilities, fea
25 thereof via conductor 9, a limiting resistor It,
and conductor II to the conductor part I'LL-24;
and at‘the other end thereof via conductor l3,
tures, or the like are comprehendedby the inven
tion as will later appear, or as are inherently
possessed by the invention. ‘
'
condenser‘ l4, and conductor [5 to theconductor
.
Referring brie?y to the drawing:
30
' Fig. 1 is a diagrammatic view of my invention’
shown in connection with a crystal unit. and with
the compensating means connected to the grid
_
Referring more particularly to Fig. 4 the inven
part 24—l6. The potentiometer 7‘ has an ad
justable contact. or slider? ‘connected to ground
22. ‘The pickup. 23 may have ,a ist‘ylusfor the
like
25.
‘
'
>
‘
‘
‘ The value of the limiting, resistor‘ It! may be:
of the input tube and'the grid of another audio
selected to limit the maximum amount of low
35 frequency response cut-off of the microphone 4,
Fig. 2 ‘is a similar view with the invention simi
or the pickup 2'3. Adjusting the sliding contact
larly connected as in Fig. 1, except with the com
8
along the potentiometer‘ ‘1. toward the end
pensating means connect die the plate ‘of an-.
thereof connected to the limiting resistor I0 effects
other audio tube;
‘ “ .
'
‘ V‘
a smooth graduated control of reducing or cutting
Fig. 3 is a partial. similar view withthe com
down the low frequency response whereby, there
pensating means connected to the ‘screen-grid of
is a'higher pitch or frequency response at the
tube;
‘
.
‘
'
L
any audio tube in the circuit; H . _
microphoneior pickup, and adjusting theslider
Fig. 4 is a similar view with. the invention used
8 along the potentiometer. l.toward ‘the end
with a piezoelectric or crystal phonograph pickup
thereof
connected to the‘ condenser. “effects a
and has the compensating means connected? en; 45 smooth graduated controlfor'reducing or cutting?
tirely to the grid of the input tube.
‘
l f ‘
down the high frequency ‘response whereby there
Referring more particularly to the drawing,
the embodiments chosen to illustrate the ilIVeIlF
is .a lowerpitch or frequency.‘ ‘response. .
' .A piezoelectricvcrystal is a mechanical vibrator
and with a crystal“ microphone 4, the latter being
also connected‘, on the grid side thereof‘, to the
grid 5 of the tube 6. It‘ is to be‘ understood‘; even
condenser,.or both, shunted across it, its frequency.
tion are shown ‘in connection with a tube I 50 electrically equivalent tola series-resonant circuit,
andv by varying the value of a resistor, or vof a
(Fig. 1), or a tube‘ 2 (Fig. 2‘), or‘ a’tube‘ 3 (Fig.3),
thoughv not shown in Fig; 3‘,‘ that the microphone
response. is accordingly‘ changed.
While I have‘herein- described and upon. the
drawing shown. a'few illustrative embodiments
of my invention‘it is. to be understood‘that the
2,411,190
3
which has a piezoelectric crystal unit connected
invention comprehends other constructions, ar
rangements of parts, details, features, or the like
without departing from the spirit of the inven
tion.
Having thus disclosed the invention, I claim:
1. In a device of the character disclosed‘and.
which has a piezoelectric crystal unit connected
to ground and an amplifying tube, the combina
.tion therewith _of a circuit including a variable
resistor only connected in shunt with said unit
to control the frequency response of said unit,
and including an adjustable contact connected
to said resistorv and to ground.
A l
to ground and an amplifying tube, the combi- ‘
nation therewith of a circuit including a variable
resistor only connected in shunt with said unit
to control the frequency response of said unit,
and including an adjustable contact connected
to said resistor and to ground, a portion of said
resistor being connected in shunt with said unit
and the other, portion thereof connected with a
condenser which is connected to said tube, said
circuit also including a limiting resistor to limit
the maximum value of low frequency response
cut-off of the unit.v
8. In a device of the character disclosed and
I ‘
2. In a device of the character disclosed and
which has a piezoelectric crystal unit connected
which has a piezoelectric crystal unit connected
to ground and an amplifying tube, the combina
tion therewith of a circuit including a variable
resistor connected in shunt with said unit to con
to ground and an amplifying tube, the combi-v
nation therewith of a circuit including a variable
resistor only connected in shunt with said unit
trol the frequency response of said unit, and in
to control ‘the frequency response of said unit,
cluding an adjustable contact connected to said
and including an adjustable contact connected 20 resistor and to ground, a portion of said resistor
to said resistor and to ground, said circuit also
being connected'in shunt with said unit and the
including a limiting resistor to limit the maxi
other portion thereof connected with a condenser
mum value of lowfrequency response cut-off of
which is connected to said tube, said tube‘hav
'
inf,r a grid and said condenser being connected to
3. In a device of the character disclosed and 25 said grid, said circuit also including a limiting
which has a piezoelectric crystal unit connected
resistor to limit the maximum value of low fre
to ground and an amplifying tube, the combina
quency responsev cut-off of the unit.
tion therewith of a circuit including a variable
9. In‘ a device of the character, disclosed, and
resistor only connected in shunt with said unit
which has a piezoelectric unit connected to
30
to control the frequency response of said unit,
ground and an amplifying tube, the combination
the unit.
and including an adjustable contact connected
therewith of a circuit including a variable re
to said resistor and to ground, a portion of said
sistor. connected in shunt with said unit to con
resistor being connected in shunt with said unit
trol the frequency response of said unit, and in
and the other portion thereof connected with a
cluding an adjustable contact connected to said
35
condenser which is connected to said tube.
resistor and to ground, a portion of said resistor
4. In a device of the character disclosed and
being connected in shunt with said unit and the
'which'has a piezoelectric crystal unit connected
other portion thereof connected with a condenser
to ground and to an amplifying tube, the combi
which is connected to said tube, said tube having
nation therewith of a circuitincluding a variable 40 a plate and said condenser being connected to
resistor only connected'in shunt with said unit to
said plate, said circuit'also including a limiting
control the frequency response of said micro
resistor
to limit the maximum value of low fre
phone, and including an adjustable contact con
quency response cut-off of the unit.‘
nected to said resistor and to ground, a portion
of said resistor being connected in shunt with
said unit and ‘the. other portion thereof con
nected with a condenser-which is connected to
'
‘ ,
‘ 10. In a device of the character disclosed and
said tube, said tube havinga grid and said con- '
denser being connected to said grid.
,
which has a piezoelectric crystal unit connected
to ground and an amplifying tube, the combina
tion therewith of a circuit including a variable
resistor connected in shunt with said unit to ’
5. In a device of the, character disclosed and
control the frequency response‘ ofpsaid'unit, and
torground ‘and an amplifying tube, the combi
nation therewith of a circuit including a vari
able resistor only connected in shunt with, ‘said
being connected'in shunt with said unit and the
other portion thereof connected with a condenser
i which has a piezoelectric crystal unit connected 50 including an adjustable contact connectedto said
unit the frequency response of said unit, and
resistor and to ground, a‘portion of said resistor
which is connected to said‘ tube, said tube having
including an adjustable contact connected to said
resistor, and to ground, a portion of said resistor
being connected in shunt with said unit and the
other portion thereof connected with a condenser
55
which is connected to said tube, said tubehaving‘
so
a plate and said condenser beingconnected to
saidplate.
'
v
,
"
1 6. In a device of the character disclosed and
which has a piezoelectric 1 crystal unit connected
to ground and, an amplifying tube, the'combina
tion therewith of, a circuit including, a variable
resistor only connected in‘shunt with saidun'it
to control the‘fre'quency response ;of saidunit,
and including an. adjustable contact connected
to said resistor and to ground, a portion of. said
a screen grid and said condenser being connected
to said screen grid, said circuit alsoincluding a
limiting resistor to limit‘ the maximum value of
low frequency response cut-o?'of the unit; _
c
a 11. Ina device of the character disclosed and
which has a piezoelectricrcrystal unit connected
to ground and to an ‘amplifying tube, the com
bination therewith of i a- connection from said
unit to said tube, a circuit including a variable
resistor only for shunting said unit to ‘control the
frequency response of said unit, and'including' an1
adjustable contact which is connected to said ‘re-.
sistor andto ground, another portion of“ said
variable resistor being connected to a condenser
which
'12. In
is aconnected
device oftothe
said
character
tube. disclosed vand
resistor being connected in "shunt‘jwith ‘said unit 70 which has a piezoelectric‘ crystal unit connected
and the other portion" thereof 7 connected with a
to ground and to an amplifying tube, the combinae '
condenser which is connected, to saidvtubefsaid
tion therewith of a connection from said? unit to
tube having a screen grid and said condenser
said tube, a circuit including'a variableresistor '
being connected to said screen grid.
‘ '
shunting
said unit ‘to control the frequency re
7. In a device of the character disclosed and
5
2,411,190
sponse of said unit, and including an adjustable‘
contact which is connected to said resistor and to
ground, another portion of said variable resistor
being connected to a condenser which is connected
to said tube, said tube having a grid and said
connection being connected to said grid.
13. In a device of the character disclosed and
which has a piezoelectric crystal unit connected to
ground and to an amplifying tube, the combina
6
maximum value of low frequency response cut
oif of said unit.
‘
~14. In a device of the character disclosed and
which has a piezoelectric crystal unit connected
to ground and to an amplifying tube, the combi
nation therewith of a connection from said unit
to said tube, a circuit including a variable re
sistor only for shunting said unit to control the
frequency response of said unit, and including
tion therewith of a connection from said unit to 10 an adjustable contact which is connected to
said tube, a circuit including a variable resistor
said resistor and to ground, another portion of
shunting said unit to control the frequency re
said variable resistor being connected to a con
sponse of said unit, and including an adjustable
contact which is connected to said resistor and to
ground, another portion of said variable resistor
being connected to a condenser which is connected
to said tube, said ?rst mentioned portion of said
resistor including a, limiting resistor to limit the
denser which is connected to said tube, said ?rst
mentioned portion of said condenser including a
limiting condenser to limit the maximum value
of high frequency response cut-off of said unit.
MARSHALL BROWN.
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