JPS5122361

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DESCRIPTION JPS5122361
■ Multiple recording system App. No. 39-4379 ■ Japanese Patent Application No. 37-47631
[Phase] Application No. 37 (1962) October 25 @ Inventor Toshiya Inoue Toshiya Yokohama
Japan 12 12 JVC Victor Co., Ltd. Ueno Ancient Buddha same place Maki Masatoshi same place 0
applicant Japan Victor Co., Ltd. Yokohama 12 Kanagawa Prefecture Moriyacho 3 12
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing an embodiment of
the system of the present invention, FIG. 2 is a waveform showing an example of a stereo audio
signal in the above, and FIG. 3 is a waveform diagram showing an example of a carrier signal in
the same Fig. 4 shows a synthesized waveform in which a carrier signal is superimposed on a
stereo sound signal, and Fig. 5 shows a recording frequency characteristic curve of a record.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiplex
recording method in which a carrier signal having an appropriate upper limit frequency
modulated by another additional signal is superimposed on a normal stereo audio signal and
multiplex recording is performed on a recording medium, Here, when performing such multiplex
recording, the speed amplitudes of the stereo audio signal on the output side of the recording
amplifier and the carrier wave signal are made equal by making y equal between the stereo audio
signal and the carrier signal. The noise ratio should be recorded without deterioration. The
invention will now be described in detail by way of example with reference to the drawings. The
figure shows the case where the present invention system is applied to a normal 45-45 system
stereo record, where 1 is a left signal input terminal of a stereo audio signal, 2 is a right signal
input terminal and 3 is an attached signal input terminal. , 4 is a [111111] modulator, 5 is an
output terminal of the modulator, 6 is a mixer for mixing a stereo audio signal and a carrier
signal modulated by another additional signal, 7 is a left signal and a carrier signal The output
terminal of the mixing mixer, 8 is the same (the output terminal of the mixer mixing the right
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signal and the carrier signal, 9 is a recording amplifier, 10 is a cutter for cutting records, and 11
is a cutter for the cutters. The left drive coil for driving the cutting needle 13 and the same 12
(right drive coil). Now, the carrier signal appropriately modulated by the additional signal in the
modulator 4 is mixed with the stereo audio signal in the mixer 6 and amplified to the level
necessary to drive the cutter 10 by the recording amplifier 9 Ru. In this case, the stereo audio
signal input to the mixer 6 from the left signal input terminal 1 or the right signal input terminal
2 has a waveform as shown in FIG. 2 and the carrier signal input to the mixer 6 from the output
terminal 5 of the modulator 4 Is a waveform as shown in FIG. 3, and the output of the mixer is a
waveform as shown in FIG. 4 in which one of the stereo audio signal and the carrier signal is
superimposed. Now, let M be the average maximum level of the stereo audio signal before being
mixed, and the same (if the maximum level of the super audio carrier signal is S, ie, these
recording level ratios, ie, The M / S ratio is a very large factor as a condition to be recorded in the
record. The reason is that the velocity amplitude of the cutting needle 13 of the cutter is detected
in the record cutter 10, and this is fed back to the recording amplifier 9 in a feedback cutter
system, which causes constant electric power. On the other hand, the velocity swing frequency
characteristic of the record cutting groove is y flat. On the other hand, the recording frequency
characteristic of the record is defined by the Japanese Industrial Standard (JIS) or the American
Record Industry Association (RIAA) etc., and its characteristic curve is as shown in FIG.
Therefore, in order to cut the record cutting groove based on this characteristic curve, it is
necessary to correct the characteristics of the cutting tool 10 and the correction of the cutting
loss, but as the electric power, this characteristic curve is y-corrected. The recording amplifier 9
having the recording frequency characteristic must be used [111111] EndPage: 1. When
recording a composite signal of a stereo audio signal and a carrier signal modulated with an
additional signal in a record, the M / S ratio is reduced, that is, when the carrier signal level is
thick After the composite signal passes through the recording amplifier 9, the above-mentioned
recording frequency characteristic of the recording amplifier makes the M / S ratio smaller and
the current flowing through both drive coils 11.12 of the cutter 10 is almost the carrier wave. It
becomes the current by the signal. A safety current is defined in both drive coils 11 and 12 of the
cutting tool, and when a current exceeding this limit continues to flow, these drive coils will burn
out. Therefore, if the record is cut within the range of the safe current, the recording level M of
the stereo audio signal becomes very small, and the signal-to-noise ratio becomes very small
when reproducing this signal. Thus, the standard recording level of a normal stereo record
defines the speed amplitude as 5cIrL / Sec, that is, Odb at the frequency IKC / S, but now, for
example, the M / S ratio is 1 and the frequency of the carrier signal If the current value of the
drive coil at the time of mixing is made the same as the current value at the time of normal stereo
recording of stereo audio signals only, the recording level of the M signal decreases by about 17
db. A record recorded with the S ratio can not be so-called compatiblity. If recording is performed
with a thick M / S ratio (small carrier signal level), the signal-to-noise ratio of the S signal
decreases, which impairs the sound quality of the additional signal, which is also unsuitable.
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From these facts, it can be seen that an appropriate M / S ratio exists within the above range.
Therefore, when the recording dovetail ratio, ie, M / S ratio, of the stereo audio signal and the
carrier signal represented by the velocity amplitude in the recorded record sound groove is made
close to 1, both the stereo audio signal and the other additional signals are signal to noise. It is
clear from the results of the experiments for M / S that recording can be done without
deteriorating the ratio. However, as the stereo audio signal level M in this case, the average
maximum level of the IKC / S component [1111111 of the stereo audio signal (normally when
the program level is monitored by a VU meter, IKC / S signal indicating OVU, ie, IKC / S standard
It corresponds to the recording level.
The stereo audio signal level is represented by. As described above, in the recording amplifier
which has been subjected to negative feedback including the cutter, constant speed output (that
is, constant speed cutting needle vibration) can be obtained for a constant amplitude input, so
outside this feedback loop When a constant amplitude human power is applied to the recording
amplifier having the RIAA or JIS recording characteristic compensator, the velocity amplitude on
the output side becomes y equal to the recording frequency characteristic compensation curve of
FIG. Therefore, as described above, in the velocity amplitude of the recording sound groove, the
recording level ratio (M / S ratio) between the stereo audio signal and the carrier signal should
preferably be close to 1, as described above. The mixing ratio of the stereo audio signal to the
carrier signal at the human power of the recording amplifier having the RIAA or JIS recording
characteristic compensator, that is, the M / S ratio of the recording frequency characteristic
curve shown in FIG. 5 to the IKC / S of the stereo audio signal of the recording frequency
characteristic curve. The degree of increase in the frequency of the carrier signal For example,
when the carrier signal is 15 KC / S, it can be said that V may be equal to 17.2 db. As described
above in detail, the present invention is a recording amplifier with a recording characteristic
compensator in a multiplex recording system in which a carrier wave signal modulated by
another addition signal is superimposed on a stereo audio signal and multiplex recording is
performed on a recording medium. It is characterized in that the velocity amplitudes of the stereo
audio signal and the carrier signal at the output side are equal y, and the desired purpose can be
achieved.
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