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JPS50114152

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DESCRIPTION JPS50114152
Patent Office Secretary Saito Hideo Address 3-12, 3 Moriyacho, Kana-ku, Yokohama-ken, Patent
applicant address Cloudy 221 3-2-2 Moriyacho, Kana-gu, Yokohama-ken Name (432) Japan
Victor Co., Ltd. Address 6105 Tokyo Minato Ward Shinbashi 1-chome 18-19 (4) Power of
attorney 1 49-017679 [Phase] Japan Patent Office 0 JP 59-, Ll, 4.1520 published Japan 50.
(1975) 9.6 Internal Code No. g767231121f31. 'I / itI-3 / ? / l 13' Specification 1, title of the
invention
Angle modulation method
3. Detailed description of the invention The non-invention relates to an angle modulation system,
the dynamic range is large by using a voltage control oscillator (1) as a modulator, and an angle
modulated wave signal without distortion due to phase (delay) characteristics Do you get an
angle modulation scheme? Intended to be provided. In the current discrete multi-channel record,
the angle modulated wave difference signal of 2 channels each is superimposed on the direct
wave sum signal of 2 channels each on the left and right front walls and cut and recorded. If
there is interference between the modulation carrier waves to be cut and recorded in this multichannel record, a beat is generated in the detection output, and a phenomenon in which a
distorted leak signal is mixed occurs. For this reason, as a conventional modulation method, a socalled splay signal modulation system in which the left and right modulation carrier waves are in
phase and modulated is used as the only method. Although the above-mentioned helical
modulation method is a modulation method having relatively good linearity, since only a phase
shift of ? radian can be obtained, a large phase shift is awaited by performing frequency
multiplication. For this reason, the need arises to provide a band pass filter in the multiplication
stage. 21EndPage: 1 Therefore, to obtain a larger dynamic range, it is necessary to increase the
number of multiplication stages. Therefore, the noise signal level also increases with the increase
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in the number of multiplication stages, which results in the disadvantage that the dynamic range
can not be expanded. In addition, the use of a band-pass filter causes the phase (delay)
characteristics of the angle-varying m-wave signal to be non-linear, which causes distortion.
Furthermore, because many transformers (coils) t-are used for the Wm filter, temperature
characteristics, aging characteristics, etc. become a problem, and are they highly stable
performance? Holding is extremely important, and there is a disadvantage that the size of the
system itself is increased. The present invention eliminates the above-mentioned drawbacks and
will be described with reference to the accompanying drawings. FIG. 1 shows a block diagram of
an embodiment of the angle modulation method which is not invented. In the figure, reference
numeral 1 denotes a main oscillator, which has, for example, an oscillation frequency of 300 Kfiz.
The output signal of this master oscillator 1 is supplied to 7-RIP 70-tub 2 where the frequency is
stepped down to 51 Giz 0 (3), while the 300 KHz output signal is passed through buffer
amplifiers 15 and 16't-respectively. And the frequency converters 17 and 18 respectively. The
output signals of the flip 70 tab 205 are supplied to the phase detectors 5 and 6 through the
output amplifiers 3 and 4, respectively, of the flip flops 11 and 12 of 5 KHz!
Each H force signal is phase compared. Above phase detector 5. The output signals of ? are
respectively supplied to integrator 7.8 and integrated 7? : After that, it is applied to voltage
controlled oscillators (VOO) 9 and 10 to control its output oscillation frequency (the carrier
frequency of the angle modulated wave signal described later). The VOOs 9 and 10 have a freerunning oscillation frequency of, for example, 270 kHz. Here, above VOO9. A variable J4 signal tI
of the 5J listening frequency band of the left channel and the right channel is supplied to the
terminal 10 from the input terminal 13.14. Accordingly, the free-running oscillation frequency
270 KHz of the VOOs 9 and 10 is angle-modulated with the modulation signal of the left and
right channels. The output angle-modulated wave signal of the VOO 9 or 10 is supplied to a
frequency converter 17.18 described later (4). The signal is supplied to the flip flop 11.12, where
the carrier frequency of 270 KHz is counted down to a frequency of 5 KHz. The angle-modulated
wave signal output from the flip-flop 11 ░ 12 is phase-compared with the output signal of the
above-mentioned 70 s. Here, the 5 KHz angular modulated wave signal supplied to each of phase
detectors 5 and 6 from Arbitr. 70 ti ti + 12 is stepped down to a flip flop 11.12 TES 12)
modulation index or modulation degree i. The phase detection operation of the phase detectors 5
and 6 is considered to be practically acceptable. Thus, phase detectors 5, 6, integrators 7, 8, VOO
9, 10 and French flip-flop 11.12 respectively constitute a phase locked loop, and the 270 KHz
output carrier of VOO 9 and the 270 kHz output carrier of wooio Is always in the same phase.
Further, the angle modulated wave signal counted down by the flip flop 11.12 is made to have
the modulation index ml smaller by the number of step-down. In 51gM, it is possible to obtain a
dynamic range which is increased by the number of step-down without detracking the loop or di
(5). The output angle-modulated wave signal of v 009, 10 is supplied to the frequency converters
17 and 18 where it is frequency-converted by the output signal of the main oscillator 1 through
the buffer amplifier 15.16. Now, assuming that the output signal frequency of VOO 9 and 10 is
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f8, the output oscillation frequency of main oscillator 1 t-fo, and the carrier frequency required
finally is f, frequency converters 17 and 18/47 = ,, A signal whose frequency has been converted
to -f8 is output. The frequency converter 17 and the daily output signal fc pass through low-pass
filters 19 and 20, respectively, and output terminals 21 and 22 take out angle modulated wave
signals of the left and right channels of the carrier frequency 31 field 2 respectively.
FIG. 2 shows a block diagram of one embodiment of a phase tM wave number) control loop of an
unintended angle modulation scheme. In the figure, reference numeral 23 denotes an input
terminal to which the oscillation frequency of the main oscillator 1 is supplied, and reference
numeral 28 denotes an output terminal of a signal controlled by the phase CM wave number eJ
control loop. (6) EndPage: 224.25.26 and 27 indicate a phase detector, an integrator, vCO and a
flip 70 tab, respectively. Now, it is assumed that the signal R (8) input to the input terminal 23
and the signal 0 (8) output from the output terminal 28. ????? Assuming that the integrator
25 comprises a resistor R and a capacitor with a capacitance of 0 as shown in the figure, its
transfer function is + T8. However, .tau. = OR. From this, the transfer function GC8) of the control
loop is expressed by the following equation. Since the equation (1) is a second-order system,
assuming that the transfer function G (8) is (7), the equations (1) and (2) are compared to give
2?? = ? (3) ?. Therefore, the angular frequency ? u and the attenuation factor ? held by the
control loop are respectively expressed by the following equations (3L (4)). Accordingly, the
transient response at the time of hold-in (tracking) of the frequency (phase) control loop is as
shown in equation (6). By the way, the modulation signal frequency 11 is of course an audible
frequency band. So, the lowest audio frequency of this modulation signal / 5. Let fi high audio
frequency be 'm2. The frequency (the frequency held by the phase-control loop is given by (87
from the above equation (5)). In the angle modulation method of the present invention, the
above-mentioned frequency fn is set to 'n' 5-10'm, (8) because one noise in the low band
generated from the semiconductor element used in the control loop including vCO becomes a
problem in the angle modulation method. doing. As described above, by setting the tracking
frequency of the frequency (phase) III control loop lower than the audio frequency band, it is
possible to suppress the deterioration of the noise due to the noise of the angle modulated wave
signal to some extent. The dynamic range of the angle-modulated wave signal of the first
noninvention system is determined by the step-down number of the alternating flop 11.12. That
is, when the shift frequency is ?f, the modulation index mf in frequency modulation is known.
Therefore, the maximum modulation limit level is determined by ? О (step-down number). In
the non-invention system, the output oscillation station (9) of the main oscillator 1 has a wave
number of 300 KH2, the output signal frequency of the flip flop 2111.12 is 5 KHz, and the free
running oscillation frequency of vCOs 9 and 10 is 270 m. Of course, any KHz may be used, and
furthermore, the carrier frequency of the angle modulated wave signal may not be 30 KHz.
Furthermore, by using a crystal oscillator for the main oscillator 1, more stable operation is
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possible. As described above, in the angle modulation system, which is not invented, performs
angle modulation with a voltage controlled oscillator, and the signal obtained by stepping down
the carrier frequency of the output modulated wave signal of this voltage controlled oscillator
and the output oscillation of the main oscillator The angle modulated wave signal is extracted
from the phase lII control loop which controls the carrier frequency of the above-mentioned
angle modulated wave signal by a signal obtained by stepping down the frequency, and an angle
modulated wave signal of a desired frequency band is obtained from this. Therefore, a large
phase shift can be obtained, and therefore, a large dynamic range can be obtained, and a band
pass filter is not convenient because one frequency multiplication is not performed, so that there
is no distortion of phase (delay) characteristics. There are numerous features such as high
stability modulation, small size, etc. + 1 nlEndPage: 3
4. Brief description of the drawings FIG. 1 is a block diagram of one embodiment of the angle
modulation method according to the present invention, and FIG. 2 is a block diagram of one
embodiment of the frequency (phase) control loop of FIG. is there. 1: Master oscillator + 2.11.12.
27 иии Ari-flop, 3, 4, 15.16 и и и Buffer amplifier, 5, 6. 24 и и и Phase detector, 7, 8 ░ 25 иии Integrator,
9, 10.26 и и и Voltage control oscillator, 13. . 14 ... modulation signal input terminal, 17 ░ 18 ...
frequency converter, 19.20 ... low pass filter +21.22 ... modulated signal output terminal. (FIG. 1,
FIG. 2, FIG. 6, other inventors EndPage: ?
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