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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing an example of the
present invention, FIG. 2 is a sequential diagram of a part of -f1 and FIG. 3 and FIG. 4 are
waveform diagrams of its explanation. 5 to 7 are system diagrams showing examples of use of
the present invention, and FIG. 8 is a system diagram showing another example of the present
invention. 1 is a source of stereo signals, 6 is a microphone, 10 is a vibrato device, and 12 is a
variable delay unit. Number? (PR Akira) 'W.4. o] q [1 1 嘲 Figure 3-115-actual opening 49-95941
(2) Figure 5 Figure 6-7-116-actual opening 49-95941 (3) Figure 8 / one 117
Detailed Description of the Invention For example, there is a microphone mixing circuit as a
circuit that enables the reproduction of one's own singing voice from a speaker by using music
from a record as a back. However, in the conventional microphone mixing circuit, one or two
microphone outputs can be matched to the left and right channel signals of a stereo device in
monaural or stereo, so that the singing voice reproduced from the speaker is the singing voice of
the singer. There is a drawback that it does not hear well compared to the above and does not
produce good effects. In view of such points, the present invention tries to present a vibrato
circuit capable of applying vibrato to its own singing voice (for FM modulation of the singing
voice), for example, when it is used in the My (1) mixing circuit. It is a thing. An example of the
present invention will be described below with reference to FIG. (1) shows the source of the
stereo signal, for example, the cartridge of the ttf record player, and the signal of the left channel
from the input is equalized and amplified by the equalizer amplifier (2L) K. The power is
amplified and supplied to the main amplifier (4L) through the mixing circuit (3L), and the right
channel signal R from the cartridge (1) at this time is supplied to the left speaker (5L'li). And the
main amplifier (4R) K is supplied through the mixing circuit (3R), and the power is amplified and
supplied to the right speaker (5R). Then, the microphone (6) is prepared, and the output thereof
is amplified by the microphone amplifier (7) K and supplied to the mixing circuit (3L) to be mixed
with the signal of the left channel, and the output of the microphone (6) Is supplied to the vibrato
device α1. (2) In this case, in the present invention, the output of the microphone (6) is supplied
to the variable delay unit, and the output of one microphone 16) is delayed, and the delay time is
periodically likelihooded Frequency modulation is performed to vibrate the output of the
microphone (6). That is, in the vibrato device (II) VC, the signal from the microphone (6) is
amplified by the microphone amplifier flllK, supplied to the variable delay unit 11 and PM
modulated, and the sono output signal is the buffer amplifier α31 and the The signal is supplied
to the mixing circuit (3R) through the filter 04) and mixed with the signal R of the right channel.
In this case, in this example, a variable delay unit (BBD (packet bridge device) is used as I2). This
BBD side is formed, for example, as shown in FIG.
That is, for example, n + 1 FETs (T,) to (Tn-)-1) are provided, which are connected in series
between the drain and the e source, and the drain of the FET (T,) has an input terminal C!
Connected to FET, the source of the FET (Tn + 1) is connected to the power supply terminal CI.
Further, the capacitor C0 is connected between the terminal v and the ground terminal (3), and
the capacitors C1 to C are connected in parallel between source-object gates of F'ET (T,) to (Tn),
The gate of the i-th scan FIT is connected to the clock input terminal 1241 of fx, and the evennumbered FET gates) # i '? It is connected to the 2 clock input terminals ˜. Further, the sources of
the FETs (Tn-1) and (Tn) are connected to the output terminal (T) through the FETs (Ta) and (Tb)
of the source follower. The portion described above, that is, the portion surrounded by the dotted
line in FIG. And terminal I24I. @ K (−1 clock oscillator port 9 as shown in FIG. 3, 180 ° out of
phase! And 2 clock pulses (-period pulse lPa1Pb is supplied). Therefore, although the terminal
voltage of the capacitor C6 changes according to the signal from the amplifier αB, when the
pulse Pa is supplied, the FET ('r +) is turned on, the charge of the capacitor C0 becomes l'ET T)
through the; transferred to Ndensa C1. Then, when the pulse Pb is supplied next, since FIT (T,) is
turned on, the capacitors C, K are transferred through the charged charge HFET (T,) of the
capacitor C1. Then, when the pulse Pa is supplied to the next (4), this turns on the PET (T,), and
the charge of the capacitor C2 is sent through the F'ET (T,) to the capacitors C and KIJ, At this
time, the PET (T,) is simultaneously turned on, so the charge of the capacitor C0 newly charged
by the input signal at this time is transferred to the capacitor C1 through the PET (TI). Thereafter,
the same operation is repeated for each pulse Pa% pb, so that a delay signal can be obtained at
the terminal (1). In this case, since the charges of the capacitors C0 to Cn are mailed out every
pulse Pa, Pb, the pulse Pa. The lower the frequency of Pb and the greater the number of
capacitors C0 to α, the longer the delay time. For example, if n-256 and the frequency of par xpg
and Pb are 10 kHz, a delay time of 12.8 msec can be obtained. In order to change the delay time
of the component BDα2 in one cycle, the clock oscillator fi9 is, for example, a variable frequency
oscillator comprising an astable multivibrator, and a low frequency oscillator ae is provided. A
sine wave signal Sc of 7 Hz is supplied as a (#) oscillator f + 5 Ivc as a control # signal of its
generation 1 wave number, and the frequency Ra of the pulse Pa and Pb from the oscillator f15
is a signal as shown by a solid line in FIG. For example, λ is periodically changed between 10
kHz and 30 kHz with a frequency of 7 Hz of Sc as a period, that is, FM is adjusted by pulse Pa,
PbtiM Sc.
Then, when the same wave number of the clock pulse Pa1 Pb is synchronously changed by the
signal Sc, the delay time τ of vcBBD α2 corresponding to this is also for example 60 ms to 20
ms with the frequency of 7 Hz of the signal Sc as a cycle. Changes periodically between
Therefore, the audio signal from the microphone 16) is periodically changed and delayed
between 4Q msec and 00 with a delay of at least 20 msec in BBD (121), and the part is also
subjected to delay and FM modulation. Therefore, BDDa3 digital signal is delayed and a vibratoadded audio signal is obtained. こう!、てマイクロホン! At the output flBBDfi2 of 6), it is
delayed and vibrated and then mixed in the right channel signal (6) R in the mixing circuit (3R) as
described above. The negative filter α4 is for removing components of the pulses Pa and Pb
contained in the output signal of the BBD (13. At this time, the output of the microphone + 1 + is
delayed (mixed) in the left channel signal LK. Therefore, the left speaker (5L) plays back his own
singing voice backed by the music of record 751 etc. And the right speaker (5R) packs music
from the record ± and his singing voice is slightly delayed Both are vibratoed and played. When
the voice of your own haunted voice and the voice of your voice that is a little delayed and
vibrato is played is played back, it is echoed to the singer at t / cord such as song N and
poppylar. As you can get a certain effect by adding reverberation, in this case you can get a
unique effect different from this. Also, since the undelayed singing voice and the delayed and
vibratoed singing voice are separately reproduced from the speakers (5L) and (5R), the singing
voice reaching the left ear and the right ear will be different, (7) When you are singing (7), the
movement of the body makes the singing voice reaching the left ear and the singing voice
reaching the right ear even more different, so that they can obtain effects that can not be
obtained with the conventional microphone mixing circuit . Also, if there is a playback signal of
the record and R has a singer's voice, it can be chorused with this. In the above description, the
left channel is supplied with an undelayed singing voice signal, and the right channel is supplied
with a delayed and vibratoed singing voice signal. According to Example 1 of FIG. In this case, a
vibrato-songed song delayed from the device annulus is supplied to both channels.
In this case, it is also possible to supply a singing voice signal not delayed by the V amplifier (7)
as indicated by the point-to both channels. FIG. 16 shows the case where the singer's voice is
present in the reproduced signal L% R of the record, and the voice iz disappears and instead a
voice of a vibrato's eye is inserted. νU (2L), (2R) signal, R is supplied to the matrix circuit 18
(signal L-rFL. (8) R-rL (0 ≦ lrl ≦ 1), and these signals L-rI (. R-rL is supplied to the mixing
circuits (3L) and (3ft), and the outputs of the amplifiers (71 and device 00 · are supplied to the
mixing circuits (3L) and (3RIK). In this case, considering the signal component in program north
such as a record, the singing voice of the singer (center vocal) is recorded at the same level in the
center of the stereo device at the same level on the left and right channels. Is recorded at
different levels in the left and right channels in order to distribute the localization to the left and
right of the singer. Therefore, in the matrix circuit (8), L-γl (, R-rL when the matrix is performed,
the level of the signal of the instrument remains t as it is, but if 1γI = 1, the signal of the singer
is canceled and disappears The signal L-rR1R-γL contains only the signal of the instrument, and
as a result, the speakers (5L, f5H) use the music of the record as the back and substitute their
own voice for singing. The singing voice will be played back. Moreover, in this case, as described
above, a one-minute singing voice is not reproduced from the speaker (5L), and one's own song
with a vibrato delay from the spy (9) (5R) is reproduced. So the effects of microphone mixing
become thicker. If O> l> DI, the singer's singing voice of the record becomes small according to
the r, so he can chorus with the singer. Off-figure is to vibrato the singer's singing voice of the
record: (In the case, the sum signal L + of the signal SL and H is taken out from the matrix circuit
(8) and this is supplied to the voice band off-filter (91 And the signal of the singing voice of the
hand is taken out and supplied to the mixing circuit (3L), (3) t), and also supplied to the device 1
(Ill and delayed and vibratoed from the mixing circuit) (At,), supplied to (3R). Therefore, the
speakers (5L), (5) (, 1) are buff music 4-L, the original singing voice and a slightly delayed vibrato
singing vocal voice are now produced.
In the above description, although 1 vibrato is always constant, it can be made more effective
according to the size of the musical note (the cheering voice). Figure 8 gives an example of such
a vibrato device, and in this example a low frequency 7 Hz low frequency device such as 30 L low
frequency device The output signals Sc of these oscillators no and m are supplied as their input
signals to the level control circuit 0η through the switches +211 and ▪. The sound signal from
the nine amplifiers (Ill) is supplied and detected by the detection circuit, and the detected signal
is supplied for time constant times NHVc to change the level according to the level (average
level) of the acoustic signal. The signal is sent to the control circuit α そ の as its control signal.
Accordingly, in the control circuit an, the level of the signal Sc from the oscillator port e or 変 化
changes in accordance with the level of the audio signal, and for example, the level 4 of the
signal Sc is increased as the level of the audio signal increases. The level-controlled signal 5ctf
digger egg is supplied as a control signal for its missing frequency fa. Therefore, the frequency fa
of the pulse Pa% h in the booster II ';) IC is thicker if the signal Sc · D level is thick: as shown by
the solid line in FIG. If the level of the force signal Sc is small, as shown by the dotted line in FIG.
4, the band α 1 changes in the band narrower than 10 kHz to 30 kHz with the period of the
signal Sc. Accordingly, the change range of the delay time τ of the BBD f 121 is smaller if the
level of the audio signal is larger (and smaller if smaller. Therefore, the amount of vibrato
increases as the singing voice increases. And the first term of the vibrato is 21), 1? It can be
changed by switching 2. Thus, the microphone mixing circuit can be given different special
effects. As described above, according to the present invention, it is possible to add to the singing
voice a unique effect that can not be obtained by the conventional microphone mixing circuit,
and to enjoy the pleasure as if a real singer is singing. The power is also easy and the cost is low.
Although in the above description, BDDQ3 is used as a delay unit, a CTD (charge transfer
element) more than a CCD (charge coupled fist device) can be used.
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