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JPS51137303

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DESCRIPTION JPS51137303
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of a conventional carrier
disk reproducing apparatus, FIG. 2 is a frequency characteristic diagram of the output of the
conventional pickup, and FIG. 3 is an output waveform diagram of the pickup of FIG. 4 is a
carrier output waveform diagram in the conventional example, FIG. 5 is a system diagram of the
measuring circuit of the present invention, FIG. 6 is a frequency characteristic diagram of the
band pass filter or high pass filter of the present invention and the conventional example, FIG. Is
a carrier output waveform diagram according to the present invention. In the figure, 1 is a carrier
disk, 2 is a pickup, 3 is a player, 4 is an equalizer circuit, 5 is a low pass filter, 6 is an amplifier, 1
is a band pass filter or high pass filter, 8 is a limiter, 9 is a limiter A demodulation circuit, 10 is a
mixing circuit, 11 is a muting circuit or a noise reduction circuit, 11 is a demodulator, 18 is an
oscilloscope, and 19 is a monitor speaker. Fig.1-5 real open 51-137303 (2) Fig.2 Fig.3 Fig.5 n6
π bZ0 j 040 N) ω station dIL group ([κHz) 1-6-real open 51-137303 (3) Fig. 4 Fig. 7-7-51-137
303 (4) Correction 50.4.11 Drawing Fig. 4 and Fig. 7 are corrected as follows. Fig. 4 Fig. 7 1 1 8-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge
frequency characteristic correction circuit, when the carrier traces the carrier disk to 1% at the
time of reproduction of the carrier disk, when the pickup traces the carrier disk, the
characteristic of the pickup is high due to the characteristic of the pickup. A cartridge frequency
characteristic correction circuit VC @@ compensates for the attenuation of the frequency output.
As a reproducing apparatus for taking out 14 signals from a carrier disk on which a conventional
multiplex signal is recorded via a pickup, a reproducing apparatus as shown in FIG. 1 is known.
That is, in FIG. 1, (11 is a carrier signal (11 籏 j 3 I), and the difference signal among the signals
synthesized from four front left, left rear, right rear and right front signals LP, LB, RB and RF to
be transmitted) A signal obtained by angle-modulating a 30 kH 2 carrier by (LF-LB) and a sum
signal (LP + LB) are cut on 10,000 walls of the groove of the carrier disk 111, and a difference
signal (RF-RB)? Similarly, a signal obtained by angle-modulating a 30 kHz noise carrier and a sum
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signal (RF + RB) are provided on the other wall of this groove. The carrier disc (1) is mounted on
the player (3), the reproduction signal is taken out by the pickup (2), and the reproduction signal
is added to the equalizer circuit (4). Furthermore, by adding the output to the low pass filter (5),
one part is removed from the carrier component of the reproduction signal and the signal 4
superimposed thereon, and the above-mentioned sum signal (LP + LB) which is the output of the
low pass filter (5) ) And (BP + RB) via an amplifier (6) to the mixing circuit α. On the other hand,
the reproduction signal from the pickup (21) is taken out from the front stage of the equalizing
circuit (4) and added to the band pass filter or bypass filter (7), and the output thereof is
demodulated via the recovery transistor (8). By adding (9jK), difference signals (LP-LB) and (RFRB) are obtained as the output (2). The difference signals (LP-LB) and (RF-RB) are added to the
mini-rating circuit for improving the 8 / N ratio, or the noise reductor circuit fillK, and the output
is applied to the mixing circuit t1. Note that a control signal is added from a minimizing circuit or
a noise reduction circuit + IllX: Vi, a limiter +8). Therefore, the signals 2LF, 2LB, 2RF and 2RB are
obtained as the output of the mixed circuit product, and these signals are constructed to obtain
the left, right rear, right front and right rear signals LP, LB% RF and RB. t. In the above-mentioned
configuration, the characteristics of the band pass filter or bypass filter ji) for extracting the
modulation signal are substantially flat at the carrier frequency band of 20 kHz to 40 kHz.
However, when the pickup (2) traces the outer periphery of the carrier disk tt + due to the
characteristics of the pickup cartridge, the output of the pickup rod 21 is attenuated as shown by
the curve U13 in FIG. As the carrier extends to the inner periphery of the carrier disk 11), it
attenuates as shown in FIG. This is because the trace of the pickup (2) extends to the inner leg
portion of the carrier disc (1), and the reproduction loss is caused by the de-tailing, etc. during
tracing loss when the reproduction signal has a high frequency. it is conceivable that. As a result,
even if carrier modulation frequency band #i having a high frequency or angle modulation such
as frequency modulation or phase modulation is performed at the time of cutting of the carrier
disc (1), angle modulation such as frequency modulation or phase modulation during
reproduction thereof. In addition to the above, he receives a range tone. Therefore, as shown in
FIG. 3, the band pass filter (7: l ′ ′, T′II), which passes only the signal in the carrier frequency
band from the signal extracted by the pickup 12), receives an amplitude modulation a4 as shown
in FIG. Modulated signal (becomes Is. As a result, the harmonic components of the sum signal (LF
+ LH) and CRF + le B having the frequency band of 0-15 kH2 described above enter the carrier
frequency band, and the amplitude becomes larger than the amount of the carrier signal. At the
inner periphery of the carrier disc +11, a large amount of harmonic components of a large
waveform amplitude as shown in FIG. 4 is inserted into the carrier frequency band (4) '7 j 曳 14 j.
む。 FIG. 44 is a carrier waveform diagram in this case, in which the horizontal axis represents
time 2 sec / d + v, and the vertical axis represents voltage 0.02 V / div. Therefore, when the
reproduced signal is demodulated by the demodulation circuit '91, there is a drawback that this
harmonic component appears as an abnormal sound. Accordingly, the main object of the present
invention is to provide a cartridge frequency characteristic correction circuit for eliminating the
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above-mentioned drawbacks. That is, in the present invention, in place of the above-mentioned
band pass filter or bypass filter (7), a bypass filter having, for example, 124 B 10 ct inclination
characteristics for correcting the frequency characteristic of the pickup cartridge at the inner
periphery of carrier disk +1) is inserted. By doing this, when one pickup picks up an inner
portion of the carrier disc (1) (it is intended to greatly reduce the generated abnormal noise.
Hereinafter, the experimental results of the present invention and the conventional example are
compared with each other, and the present invention has excellent effects.
Incidentally, the present invention described later, the conventional example and the OII test
results are actually measured by the adjustment circuit as shown in FIG. That is, in FIG. 5, ill is a
disk (5) 1 1 9 disc, and it is distinguished by a bell sound method called UD-4 system
substantially similar to the tlc 'D-4 system. It is part of this supernatural tune tf
"Touchmeinthemorning" and its playing time is 30 seconds. Also, the f-weighted pickup (2) is an
MM-type pifkuafup designed to reproduce the carrier disc (1). It is a demo synthesizer for
reproducing the UD carrier disc (1), and the output end of the pickup (2) is connected to this
demo simulator αα. − H oscilloscope, a 9 is a monitor speaker, and is connected to the output
end of this 1 det. The number of pop-outs at the time of reproduction of the measuring circuit
and the carrier disc (1) configured as described above was subjected to trial driving and
observation of one reproduced sound by using a monitor speaker (1 s and an oscilloscope feature
in combination). Hereinafter, experimental results of the conventional example and the
embodiment of the present invention will be described. , ** Example bypass filter or HA band
pass filter (If the frequency response in the carrier frequency band of 71 is the characteristic
shown by the curve (F1) in FIG. 6 (6) i 6, three different values of VC 1 to A 3 Measured using a
Φ Yaria disk (1) of the above-mentioned tune by a cartridge having the characteristics. The
number of dropouts at a point midway from the outer periphery of the carrier disk (1) and the
innermost periphery thereof in the case of O is as shown in the table below. In this case, the
carrier waveform at the time of running using the first cartridge was a waveform including many
harmonic components as shown in FIG. Embodiment 1 In the case where the frequency response
of the bypass filter or band pass filter (7) in the carrier frequency band is the characteristic
shown by the curve (F2) in FIG. Add 1111 using carrier disc (1). In this case, the number of
dropouts in the middle point from the outer circumference of the carrier disk il + and the
innermost circumference thereof and the (7) l J ZJ l membership is as follows: In this case, the
carrier waveform when the first cartridge is used is as shown in FIG. 7, and the El harmonic
component of the conventional example is greatly reduced. In the carrier waveform diagram of
FIG. 7, the horizontal axis represents time 2 sec / div, and the vertical axis represents voltage
0.02 V / div.
Example 2 In the same conditions as Example 1, when the frequency response in the carrier
frequency band of the band pass filter or the bypass filter (7) is the characteristic shown by the
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curve (Fs) in FIG. The carrier disc 11+ was used. In this case, the number of dropouts at a point
midway from the outer periphery of the carrier disk (1) and the innermost periphery thereof is as
shown in the following table. (8) Mar .-- Multi .--> 0 Example 3 Furthermore, the level of the
carrier frequency band of the characteristics shown in the curve (F3) of FIG. 6 in the case of
Example 2 is 3 dB, 1: 7? Sixth n) 9-curve-(F4) Not shown Characteristic tw s s ハ ハ ハ バ ス ・ · ·
sita It was also measured using the same carrier disk 11) using a bypass filter. In this case, the
number μ of dropouts on the innermost periphery of the carrier disk 1) is as shown in the
following table. , 2, 724. As is apparent from the above-described embodiment, the present
invention has a band pass filter and a father has a bypass filter (7) as shown by the curve (F2) of
FIG. 6 and the filter of FIG. (P13) selected as having the characteristics shown in (F3) has a
feature capable of greatly reducing abnormal noise generated when tracing the inner peripheral
portion of Carrierzo 9) Paper Iquis (1). It should be noted that the carrier disk (11 outer
circumference and 11 of them, the level of one carrier is relatively large compared to mts among
them, the level of the harmonics of the sum signal which is the main channel is compared to the
level of the carrier Because the noise is small, the abnormal sound is not very noticeable.
Accordingly, in the present invention 1, the correction of high-frequency erosion during
reproduction is performed only on the inner portion of the carrier disc il +, for example, from the
outer peripheral portion to the inner peripheral portion without correction in conjunction with
the pickup t21K. It will be clear that the correction is good.
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