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JPS4835363

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DESCRIPTION JPS4835363
■ Stereo pickup method 昭 Japanese Patent Application No. 44-48556 [Phase] Application No.
44 (1969) June 20 @ Hikaru Okawa-Kawasaki Kouki Ward Komukai Toshiba Town 1 Tokyo
Shibaura Electric Research Institute 総 合 Applicant Tokyo Shibaura Electric Co., Ltd. Kawasaki
City Kawasaki-ku Horikawacho 72 [phase] Attorney Attorney Takehiko Suzue 4, outside
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram for explaining an
embodiment of a stereo pickup system according to the present invention, and FIGS. 2 and 3 are
respectively right and left channel conversion capacitors used in the circuit of FIG. Waveform
diagrams showing displacement, FIGS. 4 to 7 are waveform diagrams for explaining
demodulation of the output of FIG. 1 by the bistable multivibrator, and FIGS. 8 to 15 are
monostable multilines of the output of FIG. FIG. 16 is a specific circuit connection diagram of the
demodulator according to FIG. 8 to FIG. 15, for explaining the demodulation by the vibrator.
Detailed Description of the Invention The present invention relates particularly to a disk record
reproduction system, which converts the displacement of the reproducing needle into a change
in electric capacitance or a change in electric resistance, and this change is the oscillation time
constant of the astable multivibrator circuit. The present invention relates to an improvement of
a so-called capacitor type stereo pickup system in which an electric signal is obtained by putting
in a circuit. A pickup for reproducing a disc record (hereinafter simply referred to as a record) as
a conventional signal source. A reproduction needle for picking up the vibration of the sound
groove wall of the record, a cantilever for transmitting the vibration of the reproduction needle to
the conversion part, and a transformer for converting the vibration of the needle tip into an
electric signal integrally with the cantilever It consists of a dumper and a tone arm that supports
the above parts and enables tracing of the [111111] sound groove of the record. Nowadays, as
this transducer, ■ Piezoelectric method of converting mechanical stress into electric signal by
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piezoelectric body etc., ■ Moving net) MM moving coil, etc. Electromagnetic motion of obtaining
an electric signal proportional to the mechanical vibration velocity of a conversion element such
as moving coil MO The electric method, ■ The photoelectric conversion method which converts
the displacement of the needle tip into the change of luminous flux or light quantity and converts
it into the electric quantity from the photoelectric conversion method which changes this light
energy, ■ The electrode plate of the capacitor The capacitor system which takes out the change
of the capacity of this capacitor as a frequency change or the change of direct charge, and
obtains an electric signal, and ■ Other e.g. electromechanical conversion of semiconductor etc. A
method using an element is known. Among these various methods, in order to reduce the
effective mass of the needle tip and to increase the compliance, the method of using moving coil
MO at the present, the photoelectric conversion element of and the capacitor method of. It has
been used for goods. The present invention relates to (1) a capacitor system among the
conversion systems. As described above, there are two types of capacitor systems, as described
below, depending on the conversion method. That is, the capacitance change due to the
displacement of the reproducing needle is applied to the oscillation circuit, and the carrier wave
of this oscillation circuit is frequency-modulated (FM modulation), and thereafter it is
demodulated by this frequency detection (FM detection) and the electric signal is The electric
charge of q is supplied onto the plate of the capacitor in the pickup and the FM type capacitor
system to be taken out. At this time, the potential difference e between both electrodes of the
capacitor is represented by e = day, where C is the capacitance value of the capacitor.
Accordingly, there is a DC bias type capacitor system that takes out a low frequency electric
signal by using the change in the potential difference e between the electrode plates due to the
change of the capacitance C due to the displacement of the regeneration needle.
However, in the above aOFM type capacitor system, [111111] EndPage: 1 must match the center
frequency of the carrier wave with the tuning center frequency of the demodulator, and this
frequency shift causes distortion in the reproduced sound. That is, the conversion capacitor that
converts the displacement of the needle tip into an electric signal changes with time. Since the
capacity changes due to temperature change, mechanical fluctuation, etc., the center frequency
of the carrier is varied, and for almost the same reason as above, the tuning center frequency of
the demodulator is also varied, and the shift of the tuning center frequency In this case, the
normal demodulation is not performed, and the reproduced sound contains a distortion
component to cause a serious failure. Therefore, this a type of FM capacitor system is delicate in
its handling and frequently requires complicated adjustment. It is not commonly used, and it is
found in some high-grade products. Also, in the above-mentioned DC bias type capacitor system,
the size of the electrode plate of the conversion capacitor, in which the capacitance value
changes due to the displacement of the regeneration needle, is limited, making it difficult to make
the capacitance thick without difficulty. Naturally, the impedance of the conversion capacitor
increases. Therefore, in order to extract a signal higher than the low cutoff frequency fc (Hz ")
from the conversion capacitor, the frequency k higher than the low cutoff frequency gc (Hz). The
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impedance of the conversion capacitor must be used to supply charge to the conversion
capacitor with an impedance greater than that of the conversion capacitor, and furthermore, the
input impedance of the amplifier for extracting low frequency electrical signals from the
conversion capacitor is determined by the impedance of the conversion capacitor. It must be fat
(it must be shunned. In general, however, the capacity of the conversion capacitor is several PF to
several + PF, that is, 1σ12F order (order), and if the low cutoff frequency fc (Hz) is sufficiently
low (the required human impedance of the amplifier reaches 109 Ω or more, It is very difficult to
obtain such an ultra-high input impedance stably and reliably, and it is a simple method, so it has
not been put to practical use. Therefore, the object of the present invention is to change the
capacitance of the regenerating needle by changing the displacement of the regenerating needle
or the electrical resistance of the regenerating needle, and to change the displacement period of
the astable multivibrator. The time during which the switching elements that make up this
astable multi-initial vibrator are turned on or off is changed by the left and right signals, and this
output signal and this output signal are bistable for every two vibrators or single Create a sum
signal and a difference signal with the output signal obtained by acting on a low [111111]
constant multi-vibrator, create left and right signals, separate the left and right signals separately,
and obtain re-output sound Therefore, D-class is not influenced by temperature change and
mechanical fluctuation, and it does not require ultra-high input impedance. Furthermore a
Zohaba possible in width unit to provide a stereo pickup system highly competitive economic
benefits of S / N ratio.
In the following, the present invention will be described in detail with reference to FIGS. 1 to 16.
In FIG. 1, the conversion capacitors corresponding to the two left and right signals are replaced
with two capacitors of the time constant circuit for determining the oscillation period. Fig. 6
shows a stable multivibrator circuit. Reference numerals 1 and 2 respectively denote an on / off
operation of the astable multivibrator ヲ Alternately inverted transistors, the emitters of the
transistors 1 and 2 are connected by a common line and grounded, and the collectors of the
transistors 1 and 2 are It is connected to the power supply terminal 5 which is normally
connected to an external power supply of typically 10 V 1 (V) via the collector load resistors 3
and 4 respectively. The connection point of the pace of the transistor 1 is bifurcated, and one end
is connected to the power supply terminal 5 via the pace resistor 6 of resistance value R6, and
the other end is a capacitance value according to the displacement of the left channel sign
component in the vibration of the regenerative needle. Is connected to the connection point
between the collector of the transistor 2 and the collector load resistor 4 via the left “channel
conversion capacitor 7” represented by the changing capacitance value C7. The connection
point of the pace of the transistor 2 is bifurcated, and one end is connected to the power supply
terminal 5 through the pace resistor 8 having a resistance value R3, and the other end is a
capacitance value due to the displacement of the cloth channel during the vibration of the
regenerative needle. Is connected to the connection point between the collector of the transistor
1 and the collector load resistor 3 via the conversion coefficient denoted by the capacitance
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value C9 at which Cv changes. Further, an output terminal 10 for connecting the output signal of
the multivibrator is connected to a connection point between the collector of the transistor 2, the
collector load resistor 4 and the capacitor 7. To explain this operation, this astable multi-biflator
circuit keeps transistor 2 on when transistor 1 is off and transistor 2 reverses off when transistor
1 is on and this on, off The oscillation is performed by alternately repeating the reverse
operation, and during the time τ1 during which the transistor 1 is off and the transistor 2 is on,
the capacitance value of the left channel conversion capacitor 7 is: [111111] EndPage: 2C7, page
Since the resistance value of the resistor 6 is R6, τ1 = 0.69 × (37 · R6). Similarly, since the
capacitance value of the right channel conversion capacitor 9 is C9 and the resistance value of
the pace resistor 8 is R8 during the time .tau.2 during which the transistor 1 is on and the
transistor 2 is off, .tau.2 = 0.69X (39.R8 Given by Therefore, the time τ of one cycle is τ = τ1 +
72 = 0.69 (C7 · R6 + C9 · R8). 2 and 3 show the displacement ξ R, (t) of the conversion capacitor
9 of the right channel and the displacement ξ L (t) of the conversion capacitor 7 of the left
channel, respectively, and FIG. The output waveform obtained from the output terminal 10 of the
astable multivibrator of a figure is shown.
Here, the time for which the output in FIG. 4 maintains + V (the time for which the atransistor 2
is off) changes according to the displacement ξ B of the right channel conversion capacitor 9,
(1), and the output is C (V) The time to maintain (ie, the time when transistor 2 is on) is changed
by the displacement .PSI.L (t) of left channel conversion capacitor 7 so that the average potential
of the output waveform is as shown in FIG. This corresponds to the difference (ξR, (t) −ξL (t))
between the displacement ξB of the conversion capacitor 9 and (t) and the displacement jL (t) of
the conversion capacitor 7 of the left channel. Also, to explain the input impedance necessary for
the amplifier for extracting the output of this astable multivibrator, the oscillation cycle τ of this
astable multivibrator is τ = 10 μsec, that is, the repetition frequency of the pulse output is 100
KHz, The resistance value R6pR8 is obtained by setting the capacitance values C7 and Cg of the
conversion capacitor 7.9 to c7 = 09 = 10PF and .tau.1-.tau.2 = 511SeC and resistances R + and R
+ 8 of the paper resistances 6 and 8 respectively as Ra = Rs. Ra = bird = 5 μsec / (0,69 × 10 PF)
2 0.7 (MΩ) = 700, and it is sufficient if the input impedance of the amplifier connected to the
output of this astable multivibrator is greater than 700 Ω Yes, this condition can be easily met.
Next, with reference to the demodulation of the output obtained from this astable multivibrator,
枦 6 can be obtained from this bistable multivibrator by using the output waveform shown in FIG.
Indicates the output waveform. Thus, the periods .tau.3 and .tau.4 of this pulse are, for example,
.tau.3 = .tau.1 + .tau.2, and when the pulse given in FIG. 6 is detected, an output as shown in FIG.
7 11111111, that is, (.PHI.R (t) .noteq.L (t)) component Is obtained. The sum and the difference
between this (ξR, (t) ξL (t) component and the signal having the (ξR (t) −ξL (t)) component
in FIG. 5 can be taken as ξB, (t) component and ξL (T) Components can be obtained by using a
general Matrices circuit, or a circuit similar to this, as the circuit for taking the sum and
difference here. Also, the pulse signal having ((R (t) −ξL (t)) component in FIG. 4 has only (高周
波 B, (t) −ξL (t)) component as shown in FIG. 5 if high frequency components are simply
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removed. In order to obtain this (ξR, (t) −ξL (t)) component, a conventional low pass filter may
be used. Next, another method of demodulation will be described with reference to FIGS. 8 to 16.
FIG. 8 shows an output waveform of the astable multi-mixer circuit of FIG. 1, and FIG. 9 is FIG.
The average potential of the pulse output waveform, that is, (ξR, (t) −ξL (t)) component is
shown.
(FIG. 8 FIG. 2 FIG. 9 is identical to FIG. 4 and FIG. 5 respectively. ) On the other hand, triggered by
the positive pulse signal of FIG. In a monostable multivibrator which maintains a zero potential
for a period of time and then reverses it to (10) V, (V) and holds this + only for 3 hours until the
next trigger signal comes in, the time constant τ '. The pulse output signal shown in FIG. 8 is
applied to this monostable multivibrator by setting .quadrature. And T2 average value, and the
pulse waveform shown in FIG. 10 is obtained. Here, since τ0 + τ58τ1 + τ2 is τ5: (τ1 ×
τ2) −τ0, τ is included in the addition of (τ1 + τ2), and passing the pulse waveform of FIG.
10 through a low-pass filter results as shown in FIG. A waveform of (ξ11′Mt) + ξL (t)
component is obtained. Therefore, taking the sum and difference of both pulse output signals in
FIG. 8 and FIG. 10 and thereafter removing the high frequency component from this sum signal
and difference signal, the signals of ξR (t) and ξ L (t) component It can be obtained separately.
Even if the operation for removing the high frequency component is performed before the
operation for taking the sum and difference of both pulse output signals, the components of
ξRIt) and ξL (t) can be obtained separately in the same manner. Now, the case where sweeping
for taking the sum and difference of the signals in FIGS. 8 and 10 is performed prior to the high
frequency component removal operation will be described. FIGS. 12 and 14 are pulse outputs in
FIGS. 8 and 10 respectively. The waveforms obtained by taking the sum and difference of the
signals are shown, and the 79L output signal in FIG. 12 and FIG. 14 includes the components of
(R (t) and (L (t) as the fundamental wave [since 11111EndPage: 3, By detecting the pulse signals
of FIGS. 12 and 14 and removing the high frequency components, low frequency output signals
shown in FIGS. 13 and 14 are obtained respectively, and thus ξR, (t) and ξL (t) components Can
be obtained separately. FIG. 16 shows an embodiment of a demodulator using this monostable
multibibreak-- next. That is, FIG. 16 shows a monostable multivibrator which generates a pulse
output signal including (ξR (t) + ξL (t)) component, a pulse output signal of this monostable
multivibrator, and (ξR (t) −ξL ( t) Pulsed human power signal including the component 7 is
composed of which sum and difference signal to obtain. That is, the transistor 11 turns off in the
steady state and turns on in the metastable state, and the transistor 12 turns on and off in the
metastable state in the steady state forms a monostable multivibrator, and both transistors The
emitter of 11.12 is connected to the ground terminal 13 and the collector is connected to the
external power supply terminal 16 of Vcc by way of the collector 9 resistors 14 and 15,
respectively.
The junction of the collector of the transistor 11 and the collector load resistor 14 is connected
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to the base of the transistor 120 through the coupling capacitor 17, and the junction of the base
of the transistor 120 and the coupling capacitor 17 is connected to the bias power terminal 19 of
+ Eb1. Connecting. Furthermore, the connection point between the collector of the transistor 12
and the collector load resistor 15 is connected in parallel with each other, and the base of the
transistor 11 is connected via the base resistor 20 and the speedup capacitor 21. The connection
point between the up capacitor and the sensor 21 is connected via the resistor 22 to the external
bias power supply terminal 23Fc of -Eb2. Next, the connection point between the core 11 of the
transistor 11, the resistor 14 and the capacitor 17 is sequentially connected in series via the
diode 24 and the capacitor 25 to connect the output pulse signal of the multivibrator of FIG. The
junction between the diode 24 and the capacitor 25 is connected to the power supply terminal
16 via a resistor 27 which applies a bias voltage to the diode 24. On the other hand, the base of
the transistor 28 for inverting the phase of the manual signal to the input terminal 26 is
connected to the connection point between the input terminal 26 and the capacitor 25 (-, the
emitter of this transistor 28 is grounded via the emitter resistor 29 Connected to terminal 13, the
rllllllN collector is connected to the power supply terminal 16 to which the + vrc power is
supplied via the collector load resistor 30. Next, a resistor 31 and a resistor 32 are connected in
series between the collector of the transistor 12 of the monostable multivibrator and the
collector of the phase inversion transistor 28, and the collector of the transistor 12 and the
emitter of the phase inversion transistor 28 Between the resistor 33 and the resistor 34 are
connected in series. The resistors 31, 32, 33, 34 form a matrix circuit, and the connection point
between the resistors 31 and 32 takes out the sum signal of the output of the monostable
multivibrator and the signal generated at the collector of the phase inversion transistor 28.
Connected to the right channel output terminal 35, the connection point between the resistors
33 and 34 is connected to the left channel output terminal 36 for extracting the sum signal of
the output of the monostable multivibrator and the signal generated at the emitter of the phase
inversion transistor 28. . Next, the operation of this circuit will be described. When the pulse
signal of the multivibrator shown in FIG. 8 is applied, this pulse signal acts on the monostable
multivibrator through the capacitor 25 and the 'diode 24. This monostable multivibrator is the
pulse signal of the input terminal 26 Since it is driven by a negative trigger, a pulse output
waveform is generated on the collector side of the transistor 12 that includes a-(ξR (1) + L (t))
component.
On the other hand, the input signal input to the input terminal 26 acts on the phase inversion
transistor 28, and a signal having the opposite phase to the signal of the input terminal 26 is
generated on the collector side of the transistor 28. The signal is-(ξR (t)- It is a pulse signal
containing ξ L (t) fatigue, and the sum of the signal on the collector side of the transistor 12 of
the monostable multivibrator and the signal on the collector side of the phase inversion
transistor 23 is obtained at the right channel output terminal 35 In particular, an output signal is
obtained which contains one ξR, (t) component as a fundamental wave. A signal having the same
phase as the signal of the input terminal 26 is generated on the emitter p side of the phase
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inversion transistor 28, and this signal is a pulse signal including (ξR (t) −ξL (t)) component,
and the left channel output terminal Since the sum of the signal on the collector side of the
transistor 12 of the monostable multivibrator and the signal on the emission side of the phase
inversion transistor 27 is obtained in 36, an output including −ξL (t) as a fundamental wave A
signal is obtained. After that, if the pulse signal obtained from the right channel output terminal
35 [111111] EndPage: 4 pulse signal and the pulse signal obtained from the left channel output
terminal 36 are low-pass filtered respectively to remove high frequency components, ξR (t) · A
low frequency signal of ξ L (t) component can be obtained. Although the transistor is used as
the switching element of the astable multivibrator in the above embodiment, the same result can
be obtained even if the switching element is replaced by a vacuum tube relay discharge tube, a
cylinder lister or the like. In the embodiment, a capacitor is used as the electromechanical
conversion element, but this conversion element determines the oscillation cycle of the astable
multivibrator, for example, a resistor such as silicon crystal whose resistance value changes with
displacement of the needle tip. Similar results can be obtained by substituting for the resistance
of the time constant circuit. Also, the pulse signal obtained from the astable multivibrator may be
demodulated by passing through a waveform shaping circuit to remove noise components, and
stereo records have opposite left and right phases with respect to the horizontal direction (、 Rtt)
Since -ξL (t) component is the sum of left and right signals, it is also possible to use a
monostable signal from which the high frequency component has been removed from the pulse
output signal of the astable multivibrator. Also, in the explanation of FIG. 10, the time constant
.tau.0 of the monostable multivibrator to obtain the (.xi.R (t) .sup.L (t)) component from the (.xi.R
(t)-. Noteq.L (t) component is shown in FIG. The average value of the periods .tau.1 and .tau.2 of
the multivibrator-has been described to coincide with each other, but this period .tau.
Does not coincide with (or may be equal to the average value of τ1 and τ2). Furthermore, in
the embodiment, the sum and the difference between the pulse signal including the (ξR (t) −ξL
(t)) component and the pulse signal including the (ξR (t) and L (t)) component After that, the
operation to remove the harmonics was performed, but the pulse signal containing the ((R (t)
−ξL (t)) component and the pulse signal containing the (ξ11 (& t) −ξL (t)) component It is
also possible to obtain similar results by removing both of the high frequency components or
removing only one of them before making their sum and difference. Also, the stereo record
cutting method is horizontal and vertical, and signals corresponding to (ξR (t) −ξL (1)
component and (ξRIt) and ξL (t)) components are produced, and then the left and right signals
are separated respectively. You can also get 4 The fine ice invention can be applied in various
ways without departing from the scope of the invention. As described above, in the stereo pickup
system of the large invention, two capacitors whose capacitance value changes with the
displacement of the playback needle [111111] or two resistors whose resistance values change
with the displacement of the playback needle are <Use as each of the two capacities that make up
the player or as each of the two resistances, the time during which each of the opposing
switching elements that make up this astable multivibrator turns on or off changes according to
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the left and right signals After that, an output signal containing the (ξR, (t) −ξL (t)) component
of this astable multivibrator is passed through a bistable multivibrator or a monostable
multivibrator Create a signal containing the (ξ FIt) + ξ L (t) component and sum with the signal
containing the (ξ R (t)-ξ L (t) ') component The ξR (t) tξL (t) component is obtained by
differential operation, and the output signal of the astable multivibrator embryo j− which
converts the displacement of the regenerating needle into an electrical signal is electrically
turned on and off. Since it is represented by two values, even if linearity is not required, power
can be sufficiently amplified using a highly economical D class booster. Also, since a noise
component can be removed by passing through a waveform shaping circuit, an astable
multivibrator, which converts the displacement of the reproducing needle into an electric signal,
is attached to the tip of the tone arm, and the output wire from here is considerably Long (even if
noise is mixed in, it is not so much, and because the output impedance is low, it is unnecessary to
use an amplifier with very high human impedance as in the past, and it is easy to manufacture
and operate. . Further, since it is not necessary to detect the period τ of the astable multivibrator
which converts the displacement of the reproducing needle into an electric signal, it is not
necessary to detect the period τ of the reproduction signal even if the period τ deviates with
time. As there is no influence at all, frequent adjustment due to changes over time etc.
In addition, two signals can be taken out simultaneously from one output, and monaural
reproduction of a stereo record and five monaural reproduction of a monaural record are also
possible.
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