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April n Showa 21 inventor address American congregation-Illinois 0101 0101 Aday ソ ン Son ys
幡 Aland / J 渚 渚 Francis Bar ・ ・ パ ー (パ ー 、 (1 other) 3 Patent applicants American
congregation Country of Illinois 46 / J / 7 Lanta Lynn Burk in varnish) d'tundameer f # 0/4,
deputy person [phase] Japan Patent Office 0 JP 50-374010 published Nissho 50. (1975) 4.8, ■
Japanese Patent Application No. iq, bqotq ■ 願 1971, (1971) l), / 7 in-house serial number
'731L6'1B670753 the title of the invention! To perform multiple scheduled control actions in a
multi-channel device with Luchi Channel @ * @ Road arrangement 1! III. In a circuit arrangement,
a device for growing a plurality of signals II, each having a small amount of / II signal current
steering device, and a corresponding signal received and amplified, said signal path Between
each of the potential source and each of the signal steering devices. A multi-stage variable
resistance device, wherein the supplied signal is selectively supplied in a forward direction for
boosting action or K for feedback for relative attenuation. Channel control circuit arrangement.
1 Claim
3 Detailed Description of the Invention The invention generally relates to multi-channel control
circuits, in particular for use in the audio division of the associated receive-) multi-channel
control circuits, volume, balance, treble and base. Such control of the required audio control for
any number of audio channels. A single and inexpensive single-part DC operating control element
relates to a popeering multi-channel control circuit arrangement. Various manual adjustable
controls by users for multiple audio channels, such as in conventional stereophonic or
quadrasonic (da-channel) music devices etc., require one or more potable resistance control
elements. . Usually, each separate potentiometer is interconnected on one control axis, and each
such potable resistance element is inserted into each associated audio channel. Such a composite
control element is an essential element up to now It was sworn to be The reason is that in order
to control signal information through the resistive element itself and to control the air and to try
to combine the function of one such element with the function of the other element, it is
necessary to generate a field F-. . In particular, with regard to F-n control, i.e. with the control of
the Treble and base EndPage: 1, each separate potentiometer, which is connected within the
relevant envelope and connected to the common control, must be operated. There is also the
problem of simultaneously sliding each separate resistive element at the same time. Furthermore,
the associated circuitry used to selectively solicit treble and base in the transformed audio signal
information is generally complex, particularly in multi-channel devices. These circuits are more
expensive and often require considerable space. SUMMARY OF THE INVENTION Accordingly, it
is an object of the present invention to provide an improved multi-channel control circuit
arrangement having a plurality of manually adjustable controls for hen and low frequency roll-off
and other control and eliminating the aforementioned drawbacks. is there. A more specific object
of the present invention, an audio system in which the desired audio control is easily
accomplished using a single DC-acting variable resistive element for each such desired control
for any number of signal channels. In order to provide a control and circuit arrangement, it is
intended to provide an audio control circuit arrangement of the type described above in which
the adjustable control elements themselves are not passed through. The objective can be
implemented in a single monolithic integration port (by means of a simple external potentiometer
device coupled to the required variety of audio wli signals including repelle, base, volume and
tolerance to a unidirectional potential source) It is an object of the present invention to provide
an audio control circuit of the type described above.
Yet another object of the present invention is the above described integrated circuit
configuration in which the DC level is effectively balanced so that the DC level is substantially
unchanged by the various settings of the associated DC operating audio I '[ll JIK device. Try to
provide the type of audio e, tm circuit arrangement. It is important to establish a technique to
achieve effective tone control and volume and balance control for multi-channel audio devices by
using a single variable resistance element to which DC voltage is supplied to one terminal. . Audio
control 1 Circuit arrangement is formed in monolithic integrated circuit form and various audio
control units (replete, pace balance and polyneim) are provided O2K outside the IO package O
control circuit itself 0 control circuit itself Kti differential amplifier A plurality of current steering
circuits in the form are provided. To achieve this in 7Il of these differential amplifiers associated
with the tone control lt / pair filter network. The output of this differential amplifier is fed to two
filters, one on the high pass and the other on the low pass, and the respective signals
representing the base and treble signal information are returned (the "cut" action Provided) or
fed forward ("boost" action is obtained). Control by feedback or forward feed sh related variable
resistance element or switch body) effectively providing such control elements as l- for treble
frequency and seven for base frequency as well as balance and volume control In this case, the
high-pass and low-pass filter @ path networks are defective in that the feedback is not used. A
pair of differential −5 II operating in parallel is a suitable DC potential source El! Control section
with related potentiometers (control elements). As a result, the multi-information signal is
effectively transmitted with no change on the ground kf + road. The company operates the right
and left channel differential amplifiers in the same direction for volume control, ie forward both
the left and right signals. Must supply in parallel, shunt both, remove. The balance control 1IIC
controls the left and right signals in a mutually complementary manner, supplying one in the
forward direction and shunting the other and vice versa. The invention will be described with
reference to the drawings. In the drawings, FIG. 1 shows the inventive audio control circuit
arrangement in integrated circuit form. "As shown, this integrated circuit chip includes four
separate bond pads that operate as external m-junctions. This example control circuit · is a stereo
device with left and right audio channels. It is particularly preferred to use, but not limited to
such applications.
A / a pair of such integrated circuit chips X is sufficient for the reference channel audio device.
However, multi-channel EndPages other than circuit xld stereo and reference channel audio
devices can be advantageously applied to two-channel devices, and the invention is of course not
limited to the control of audio frequencies. is there. The purpose of the circuit X for the device 4c
having multiple audio channels is to set predetermined basic audio control for the left and right
audio channels, ie volume, balance, treble or traffic-based control of simple and inexpensive
single variable impedance device Of course, it is to be carried out in the form of a DC operation
control device. As shown in FIG. 1, a potentiometer n connected between a fixed terminal and a
unidirectional potential source and the ground performs desired F-rebble control, and a
potentiometer J connected similarly performs base control. Likewise the potentiometer! a)
Perform volume control at position g, and operate as a potentiometer xh conventional balance
control device. The operation of the audio control circuit X can be more easily understood by
referring to the pull-up diagram of the circuit arrangement shown in FIG. As shown in this figure,
one associated receiver number is fed to the input terminal 15 and from there to the differential
amplifier #X. One output of the differential amplifier y (about half of the input level) is supplied
directly to the tone control output reference terminal 32. The other output (about three times the
input) of the differential amplifier y is fed to the filter network #. Filter Network One of the
output parts passes a frequency above the intended reference frequency (eg 1000 H) and thus
acts as a high pass filter and the other output acts as the required low pass filter ,. Pass
frequencies below 1000HM. A high-pass frequency (treble) signal output is provided to the first
DC control loop j 174 C, and a low frequency (ie base) signal output is provided to a separate
similar DC-JIi 1 network 60 each DC 181I? iJ network 50 and 60 Fi / pair of output terminals.
One output of each control network is fed back to the differential amplifier 30 and the other
output is fed to the tone control output reference terminal 3λ. When the movable contact arm of
the treble control device, ie, the methin geometer, is adjusted close to the B terminal, almost all
the lep frequency and p threat audio signals are supplied to the differential amplification @ MK
return terminal. And therefore "cut" position or shape adjustment-but when the peristaltic arm of
the l tensiometer 調整 is adjusted close to the ground terminal>, the signal information company
forward feed, ie the output terminal which acts as a "boostage" action Supplied to
The adjustment of the base control meter geometer S has the same effect on the base station
wave number, in which case #i Booth) action is performed on frequencies below the 1000 HzO
reference station wave number. The important point of the present invention is that the F-n
control output terminal JJK appears in the conventional conversion signal! As it is generally used
in, it consists of three waveforms instead of KJ and is in the saddle point. In the circuit
arrangement described above, one part is obtained from the output of the differential amplifier
circuit WO and one other two parts are obtained from the DC control circuit J and ≦ atom force.
These latter two parts enhance or attenuate the signal frequency of the two ts parts in the
frequency range, but the middle range frequency company hardly carbonizes-in this case-a
conventional layer using a wedge of one waveform part The unwanted [cusp J (Ouspimg) effect
that has been occurring is effectively removed. The peaking effect is the result of the base and
treble frequency portions that occur offset as their outputs interface due to the phase
relationship as the composite audio signal passes through the sequential band pass filters.
Anyway, the above tone Ill! The lIm device n and 3 eg an example ttf 1000 Hz (D reference level
kfs la + J / dbs degrees)-designed to generate Talcutge and a "cut" of about -tsa'b. That is, the
cutting action or feedback 1 '. Under the condition the gain of the output of the differential
amplifier y associated with the tone control output reference terminal n is reduced by about-乙
ILb / オ at a threshold value of -2 / repair limit <toon H 冨 -tsab) 1 . In this company full cassi
position, it represents that it is l / ≦ damping. Conversely, in a 5 boost operation or forward feed
operating condition, the gain of the differential amplifier X is increased by about 10 ≦ am /
octave from the reference level of fl1000 Hz to the limit of + 2 / min. The above numbers (IFi is
never critical,-just an example. Specific Design Needs for These Numeric Line Specific
Applications EndPage: It can be changed to fit into 3 cases. An example of the circuit of the tone
control part of the integrated circuit layout X is shown in FIG. The audio control circuit is shown
for simplicity for l channels, ie -4 for the left audio channel. The circuitry for the right audio
channel works similarly with the left audio channel and the essentially cIwl-et configuration. As
shown, one audio signal is supplied to the input terminal of the bonding pad / J, and from there
to the differential amplifier 〃.
The transistors IOa and the base input end pre-test resistor 33 of 〃1 are connected to each
other, and from there via the resistor 36 to ground. The transistors of transistors 30 & 101 are
interconnected by a pair of resistors B and M, and their junctions are coupled to the collector of
the J) run lister, which acts as a current source for the two transistors. Resistor J7 acts as an
emitter load for transistor JOo, and resistors U and J? a) Run as a runlister j17 & & zbo collector
load. As mentioned above, the collector of the runlister XJb is used as an output terminal for
differential amplification @ M〇, and the other output of G is taken from the collector of the
transistor 30h, and this collector is used as the transistor W and the resistor p. Through to be
coupled to the filter network V. By appropriately selecting the value of the resistor 33, about half
of the input signal present at the bonding pad / St / C at the collector of the transistor 3θ1 in
relation to the level of the operating potential supplied to the differential amplifier y is obtained.
To be able to At the same time, the output of the transistor x island collector is approximately 44
* of the above input signal. The filter network V comprises a binding pad / JK coupled capacitor
dip which has a value of passing frequencies above the 1000 HmO reference frequency and acts
as the required high pass filter. It is connected in series with the connection between the bonding
pad 14 and the external ground of the circuit 0, and is used as a low pass filter necessary for the
stop and nailing and resistance% control. The output obtained at the connection point between
the capacitor is and the resistance% is supplied to the bonding pad l. Resistor C female F
runlister's emitter load ls), capacitor q .. provides compensation for approximately JfKHz slew-off.
@@ * jo provides l-to-O differential amplifier I2 and! d to provide separate high and low signal
frequencies at lndinda pad l and / JKk to DC control circuits X and 60, respectively. It has a
current steering device that makes it easy. Each differential amplifier has three F transistors j aj j
j b j j Jo and j j IL j j) j j 6 which are suitably interconnected as shown. The transistors 5 and 5
operate from a current or a signal source, and the l pairs of the runlisters jJa-jJ'b and jf-*-j1 are
related. Act as a current steering device. Transistors jJs and t4! The base input terminals of b are
interconnected in the same manner as the base input terminals of transistors 5 and b.
resistance! ! And jt work as an Ivy load. The operating potential is supplied via a resistor it
connected to the terminal of the flatter KB 10 of the transistors jJ & and S 亭 a. In operation,
transistor jJ · is biased to a predetermined conduction level (by means of a reference voltage
supplied via resistor jde to its base), on which a high -1, ie, the signal frequency, is superimposed.
This transistor acts as the current of the differential amplifier 9, ie as a signal source, and the
signal current is shunted by the transistors jJ & and jJK according to the supplied bias. The fixed
reference voltage is supplied to the connection point of the base input terminals of the
transistors jJb and Sl &, and the usable bias potential is applied to the base input terminals of the
transistors jJa and sol: I by the treble control of the electric tensiometer n. Supply via j7. Thus,
the F-Lansta jJa is supplied to the base 1. . The current flows through the run lister jJa (mostly
the line of the signal current when the voltage is higher than the voltage supplied to the
transistor 32bO base). Of course, it depends on the specific difference in bias voltages supplied to
the bases of the actual current values. In particular, a substantial portion of the signal frequency
of the base of the transistor jλC is fed back to the base input of the transistor gb of the
differential amplifier 経 through the transistors 70 and 7 acting as level shifters. As a result, the
signal level * S of the associated output terminal decreases, and the signal level of the tone
EndPage: 4 · control reference terminal 32 decreases. Because of this, the treble controller n at
this position has a "cut" action. However, if the treble controller is adjusted to a position where
the base bias of transistor s2 & is lower than the bias supplied to the base of the transistor, the
signal current flowing through the transistor is increased, and accordingly the current of
runlister s2 & is decreased. . In this case, the output of the transistor Q is forwardly supplied to
the tone control reference terminal n, and the signal a supplied from the output terminal of the
transistor 3 to this terminal 32 is enhanced. In this operating condition, the booth F or forward
feed is obtained as described above. Preferably, the differential amplifier 54E provides DC
balancing to eliminate unwanted shifts in DC level. Differential Amplifier # Operates in parallel
with the butterfly differential amplifier g, but interconnects the voltages supplied from the
reference voltage source and the treble controller U to be controlled to be in the opposite
conductive state with the differential amplifier U.
That is, F transistor s # 1 becomes nonconductive when the transistor island becomes
conductive, transistor 54Fb becomes nonconductive when the transistor is conductive, and vice
versa. The operation of the DC control circuit J is also described above for the DC control circuit
y and is essentially the same as the light operation, and detailed description thereof is omitted, so
it is omitted. The only difference is that a low or base frequency is provided to the base of the
associated current source transistor Ua. The reduction of the output from the feedback or
differential amplifier occurs when most of the signal current flows through the transistor α, and
the forward supply, ie the boost action, is effectively through the transistor with which the
signal current is related . At the end of the event that occurs as it flows, the level shifter 10
coupled to the (-) control output reference terminal 32 is composed of the interconnected
transistors I / and 12 as shown, a resistor r # -tt and a capacitor r. With regard to balance and
volume control functions, it is better to refer to the schematic in FIG. 2A to illustrate both the
right and left audio channel segments, to illustrate the required interaction of the balance control
function. The left audio channel comprises l pairs of DC # llI circuits 10O and iio, the right
channel comprises similar DC control circuits / JO and ixo. Each control circuit consists of a
current steering circuit consisting of one pair of differential amplifiers. The DC control circuit
100 is a differential 7 amplifier 10λ and IO! And the DC control circuit iio comprises differential
amplifiers // 2 and / # t-. In left channel operation, an audio signal is fed to the base of transistor
102o, which acts as a current source, and then selectively flowed to transistors 1oah and 10λb.
The differential amplifier 1 ot functions to make the DC current level 1000 * g as described
above in connection with the differential amplifier evaluation of the DC control circuit y. The ac
signal of the output terminal of the transistor 102 is then likewise subjected to a DC balancing
circuit 114! Flow to the circuit / / 2 to provide. The signal output of the collector of the
transistor (//) is supplied to an emitter p t i ≦, through which it is supplied to a bonding pad −
to form a left audio signal output blade. The same operation occurs in the right audio channel, as
a matter of course, the current source transistor lλ, and 2 oK supply one hundred signal
information are DC control circuits l and o. Selectively flow through the differential amplifiers /
22 and 13λ '. The signal output of the collector of the transistor 13λb is supplied to the emitter
follower transistor 13, from which it is supplied to the bonding pad t, which is taken as the right
audio signal output.
The balance control device is effectively coupled 1 ° to the connection point of the base input
terminals of the transistors 10λ1 and 101113 and to the base input terminals of the transistors
/, 2.2b and / j. Further, the fixed reference voltage is supplied from the voltage source / 10 to the
base human terminals of the gun resistor / JJa and lλ + b and the base input terminals of the
transistors 10 co and 101 a. Similarly, the volume controller is coupled to the junction of the
base terminals of the transistors // Ja and // Q'b and to the base terminals of the transistors / 3
and q / 74411. A fixed reference voltage is supplied from the voltage source / 60 to the P node
terminal of the F transistor / / 2 kr and // la and the base terminal of the transistor / 32 "b and /
J & the End terminal: 5. Balance and volume l! The operation of the 1IIa1 operation is best
understood by reference to the simplified circuit diagrams shown in the 1asa and sb diagrams.
The control differential amplifiers 102 and / 22 have a reference voltage source tSO for
commonly supplying a reference voltage from the reference terminal / 17 to the base input
terminals of the transistors 102b and / 22h. The DC voltage selected by the balance control
device 1 outside the integrated circuit is supplied to the other reference terminal tSS common to
the base human input terminals of the F landers lOJ & and lλ co b via the series resistors ls2 and
ts. As shown, another resistor txt is connected between the reference terminals tss and 757 and
thus between the differential amplifier io λ and the 1220 base connection. Therefore, when the
reference voltage supplied from the balance control device to the terminal 15S is higher than the
reference voltage supplied from the voltage source ISO to the terminal 157, the current source
transistor 10. , And 20 and / J 0 0, the information on the No. 891 selectively flows through the
transistors 10λ 1 and taxb, respectively. As a result, the signal output of the left channel is taken
out of the collector of the transistor 10Jb, and therefore the signal level of the output of the right
channel 2b is increased because the signal output of the right channel 2b is decreased. Of course,
the opposite happens if the reference voltage supplied to the terminal iss is lower than the
voltage level of the terminal 117 supplied by the voltage source 80. Smoothing from one
operating state to the other operating state Switching is performed by the action of the controller
I. The operation of the volume control shown in FIG. J 'b is substantially similar to the operation
described above for the balance control d, and the difference is that in this case the respective
outputs are controlled in the same direction .
That is, the output blades of the right and left audio channels are taken from the collectors of
transistor II: lb and 13 cob ti! Both increase or decrease depending on the appropriate
adjustment of the reference voltage supplied by the controller. As in the case of the balance
control circuit, the potentiometer, the resistor 16 and the capacitor ttr are also provided outside
the integrated circuit package * The present invention has been described above only for specific
examples. The example KO Li is not slaughtered, of course, it is something which can add many
deterioration. The summary of the implementation requirements of the present invention is as
follows. The control circuit described in claim 11 is provided in a single integrated circuit, the
variable resistance device of which is provided externally for manual adjustment.