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JPS4946702

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DESCRIPTION JPS4946702
· 41 "B," Patent Office Secretary-Name (582) Matsushita Electric Industrial Co., Ltd. rl 2
representative representative Matsushita Masaru i stand 4 agent 〒 517 Address Osaka
Prefecture Kadoma city Oza Kadoma 1006 address Matsushita Electric Industrial Co., Ltd. (4 A)
Request for duplicate of the application-1-Japanese patent office 0 JP JP 4967702 [phase]
published Japan JP 49. (1974) 5. , 4 agency internal reference number □ 1 o Japan classification
1 Mi statement 1, the name of the invention
Record player
3. Detailed description of the invention Carrier frequency signal in the frequency band higher
than audio frequency with audio frequency signal (hereinafter referred to as audio frequency
signal)) different from recent audio frequency signal (hereinafter referred to as audio frequency
signal A) All FM or qPM A recording board has been developed and used in which a modulation
signal (hereinafter simply referred to as a modulation signal) obtained by modulation is added
and these are simultaneously recorded in one sound groove. In this type of recording board, to
pick up the audio frequency signal color, the pickup is used to extract the audio frequency signal
A and the modulation signal at the same time, this is separated by a filter, and the modulation
signal is demodulated to obtain an one audio frequency signal You need to play. However, since
the recording disc is made of synthetic synthetic resin material, it is easily deformed by the
charge of the pickup or the frictional heat generated by the needle point. And, in this case, since
the charging friction force depends on the displacement of the sound groove and the impedance
of the needle tip, the state of the deformation is greatly influenced by the recorded signal. For
example, asperities that are recording modulated signals move or shake under the influence of
the signal. EndPage: 13 For the modulation signal or the audio frequency signal A, AM
modulation and FM, PM modulation is received, and the modulation signal is 1 ill signal t If the
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original audio frequency signal 乙 is distorted It will be represented in the form. The present
invention aims at making as close as possible to the original signal by applying the correction to
the signal to be demodulated using the properties of the record board and the conversion
characteristics of the pickup skillfully from the above-mentioned saddle point. It is a thing.
Hereinafter, the record reproduction cylinder of the present invention will be described with
reference to the drawings of the embodiments. FIG. 1 is a block diagram of one embodiment of
the record horse master device of the present invention. An electrical signal from the pickup
corresponding to the displacement of the sound groove is applied to the input terminal 1. The
electric signal applied to the input terminal 7-1 is the audio frequency signal A and the audio
frequency signal F as described above, and the carrier white signal in the frequency band on the
audio frequency BI is also FM or! It is a composite signal with the modulation signal obtained by
riPM modulation. Reference numeral 2 denotes a preamplifier having an appropriate frequency
characteristic as well as an amplification function, and sometimes called an equal control or an
equalizer 1 because it functions to restore the recording frequency characteristic on the
recording side. An amplifier circuit 3 further amplifies the output of the pre-amplifier 2 to
process the frequency appropriately, and outputs the output of this amplifier circuit 3 to a
speaker (not shown) to reproduce the sound corresponding to the J7 Jafnti audio frequency
signal nona can do.
In this case, a modulation signal is simultaneously applied to the speaker, but since the
modulation signal is an inaudible frequency signal higher than the audio frequency, it is not
reproduced as voice, and even if it is reproduced, it is It is not an obstacle. If it is necessary to
remove the modulation signal, a low pass filter may be inserted before or after the amplification
circuit 3 to pass only the audio frequency signal. A high-pass or band-pass filter 4 inputs the
output of the pre-amplifier 2, and selectively passes only the modulation signal from the output
of the pre-amplifier 2. Reference numeral 6 denotes an inaudible frequency amplitude regulator
to which the output of the filter 4 is input. Reference numeral 6 denotes a so-called phase
adjuster such as a variable phase shifter, a variable delay device, or a frequency adjuster.
Reference numeral 7 is an FM or 6 for demodulating a modulated signal,. Here, the FM detector
and the PM detector are essentially the same, and the PM detector is generally configured by
combining the FMWL wave device with the same wave number adjustment circuit. Reference
numeral 8 is an oscillator 4 @ adjuster for adjusting the amplitude of the audio frequency signal
乙 detected by the FM or FM detector 7, and 9 is an output terminal thereof. 10 is an amplitude
detector for detecting a change in modulation of the modulated signal that has passed through
the filter 4, and 11 is a controller for appropriately converting the waveform of the AM @ wave
signal obtained by the amplitude detector 10 . It should be noted that the output of the controller
11 is used to control the degree of adjustment of the amplitude or amplitude, the phase
adjustment 6, the amplitude and the adjustment applied to the adjustment unit 8, and so on. The
speech signal having passed 4 is subjected to adjustment of the amplitude and phase according
to the output of the controller 11 by the amplitude p-regulator and the phase adjuster 6,
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respectively, and detected by the detector 7. Therefore, an audio frequency signal 乙 appears on
the output side of the detector 7 and this is further adjusted by the amplitude adjuster 8. Figures
IJ2 to 4 show another constitution of the present invention, also 11 in which each n is a part
obtained by removing a part from the one shown in Figure 1I. That is, the phase adjustment
device 6 shown in FIG. 2, the one shown in FIG. 3 (the amplitude adjustment adjustment 6 and
the phase adjustment device 6, and those shown in FIG. Each is removed from what is shown in
FIG. [FIG. 6] FIG. 6 is a block diagram showing one embodiment of the amplitude adjuster 4.8,
wherein 1, 2 are input terminals, 13 is an output terminal, and 14 is a control signal input
terminal. Reference numeral 16 denotes a variable resistance element whose equivalent
resistance changes according to a control signal. This is a source of a field effect transistor, a
resistance between drains, a 111 direction resistance of a diode, a photoconductive element such
as CdS, and other variable resistance elements. Composed of!
しる。 FIG. 7 is a block diagram showing an embodiment of the phase adjuster 6, in which 16 is
an input terminal, 17 is an output terminal, and 18 is a control signal input terminal. Reference
numeral 19 denotes a phase inverting circuit composed of a transistor or a transformer, and one
output terminal is connected to the output terminal 17 via the capacitor 20, and the other output
terminal is connected to the control signal. EndPage which changes the resistance value
isometrically EndPage: 27 /... Is connected to the output terminal 17 through the variable
resistance element 21. Therefore, in the regulator 6, the phase of the signal appearing at the
output terminal 17 is determined by the capacitance of the capacitor 20 and the value of the
resistor 21, and the output terminal is controlled by controlling the resistance value of the
variable resistance element 21. The phase of the signal appearing at 17 can be uttered.
Incidentally, the controller 11 is a circuit having an appropriate amplification degree and a
special non-linear characteristic as needed. FIG. 8 and FIG. 9 show four examples of the nonlinear characteristic. . FIG. 10 illustrates how the modulation signal is affected by the audio
frequency signal A, and ←) shows the sound groove inscribed on the recording board. In Fig. 1 α
et al.) The small unevenness is due to the modulation signal of FM or PM variation on the carrier
wave on audio frequency signal color allowed @ L @ wave number, showing that large undulation
moves in the direction of the arrow while audibly circling There is. 8 · When the pick up is billed
by the sound groove of the record board shown in Fig. 10d and the signal is detected as shown in
Fig. 1, the output fillU of this is shown in Fig. 10 (b As shown in), a modulated signal
accompanied by a change in amplitude appears. That is, the change in amplitude of the
modulation signal during recording? Even if it is not accompanied, the relationship between the
sense of sound and the tip of the needle as described above always causes a change in amplitude
at Yayoi. And, furthermore, not shown in detail in the figure, a phase fluctuation occurs at the
same time in relation to the audio frequency signal A 'in the waveform of each cycle of the
modulation signal. In any case, they affect the output of the FM detector. By the way, in this case,
the FM m-wave device splits and amplifies the ordinary house input signal and passes it through
the amplitude limiter so that the influence of the amplitude change does not affect the detection
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output very much! In practice, the fluctuation of the phase is a particularly important problem.
This is because the modulated signal that has been recorded is further phase-modulated, so that
the detector simultaneously detects this phase fluctuation together with the original modulated
signal. For this reason, in the detection output, it is impossible to separate a signal different from
the intended one at the time of recording by reproducing a signal different from the one
originally intended at the time of recording. is there.
The amplitude change and the phase change of-are related to each other because both t'L are due
to the shape of the audible frequency (the sound of fi No. A). That is, there is a one-to-one
correspondence between the change in amplitude and the change in phase. Among them, those
that can be easily detected due to the change in amplitude, according to n. It is also possible to
estimate the change in phase and to cancel the second decision. Of course, it can be offset to the
shadow v of the change in amplitude. 1 ': FIG. 10C) is a signal obtained by amplitude modulation
with the detector 10 shown in FIG. If this signal is added to the modulation signal or the detected
audio frequency signal color, the influence of the audio frequency signal is canceled to obtain the
intended signal at the time of recording. The above is the basic principle of operation of the
device of the present invention. Of particular importance in this operation is the operation of the
controller, 11. This role (well, it is as follows. 10 '(1) The amplitude adjuster 51 is controlled. In
this case, if one alignment device 6 is a straight line @ at the board, the input / output of the
controller 11 must be in a proportional relationship. If such a relationship is satisfied nn, the
amplitude of the output of the amplitude adjuster 6, that is, the human power of the FM detector
7 has only one amplitude, and there is no influence on the FM detection output due to the
amplitude change-(2) Phase modifier 6t-control. In this case, the performance required for the
controller 11 is determined by the material of the record, the rotation speed, the shape of the
pickup needle tip, the needle pressure, and the like. Phase change (C cancellation means to use
phase 1 = relationship with amplitude change as described above, or this phase relationship is
due to the combination of record, pickup, record, pickup as described above . Generally, this
relationship is non-linear, so it is desirable to make the input / output characteristics of the
controller 11 as shown in FIG. 8 and FIG. (J The amplitude adjuster 8 is controlled. In the
configuration of FIG. 1, the importance is not very high. The reason is that a sufficient correction
is made before FEndPage: 31 to 1 'M detection, and the influence of the signal A is almost
completely canceled. For this reason, in this case, 14M1M is complementarily added to the place
which is not compensated at the former stage. For n and n, in the configuration shown in FIG. 3,
n is of great importance. Before FM detection, since all the corrections and adjustments 8 are not
performed, it is not necessary to perform the OFF operation. In this case, operation is performed
using the overall correlation between the amplitude change and the phase change of the signal
と and the FM detection output.
This relationship is also generally non- @. As is apparent from the above description, according to
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the non-invention, n is used to reproduce the modulation signal recorded in the same tone
groove as the signal A with the modulated signal I, -.eta. Good reproduction. Although no
particular mention is made of the record board, the term "record board" in the present invention
means a board made of a synthetic resin, mechanically or chemically subjected to fermentation
(concave and convex), and this surface And a transducer that detects the sound groove with an
electrical signal. At present, the most frequently used, <the form used is a disk-like shape, and the
sound groove is in a spiral shape and has a pitch of rL. And, the sound groove is an inaudible
frequency sufficiently higher than the audio frequency with two sets of independent audio
frequency signal and audio frequency signal in one groove in a method of making a γ according
to the general 45-45 system. The modulated carrier wave is a signal that is recorded.
4. Brief description of the drawings. FIG. 1 is a block diagram of an embodiment of the record
producing apparatus of the present invention, and FIGS. 2 to 4 are block diagrams of another
embodiment of the present invention, FIG. 5 and FIG. Is a block diagram of one embodiment of
the amplitude adjuster, FIG. 7 is a block diagram of one embodiment of the phase adjuster, FIG. 8
and FIG. 9 (input / output characteristic diagram of C controller, FIG. It is a wave form diagram of
each-signal obtained by the sound groove and board n of a board. '1 ... input terminal, 2 ...
preamplifier, 3 ... amplifier ... 4- ... filter, 608 ... amplitude adjustment 6 · · · Phase adjuster, 7 · · ·
FM detector, 9 · · · · · · · · · · · · · · · · · · · · · · AM AM R%, 11 · · · ... Name of controller Attorney Nakao
Toshio Nakao has 1 person 11m Figure 2 Figure 3 Figure 4 EndPage: 4 Figure 7 Figure 8 Figure
9 C-6 Other agent address Osaka Prefecture Kadoma city Oda Kadoma address 100 Matsushita
Electric Industrial Co., Ltd. Internal name (6152) Attorney Shigeo Shigeno EndPage 5
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