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JPS4992802

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DESCRIPTION JPS4992802
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing an example of the
present invention, FIG. 2 is a connection diagram of an example of a part thereof, and FIG. 3 is a
waveform diagram for explanation thereof. 1 is a source of stereo signals, 6 is a microphone, and
10 is a delay device. 2 Fig. 1--1-. +++. + ++ ++-J-5 J-Apr 49-92802 (2) Fig. 2 op, 『ζ ζ ■ 第
Fig. 1 6− 6
Detailed Description of the Invention For example, there is a microphone switching circuit as a
circuit that enables the user to play back his / her singing voice from a speaker by using music
from a record as a back. However, in the conventional microphone mixing circuit, since one or
two microphone outputs are added as they are to the left and right channel signals of a stereo
device in monaural or stereo as they are, the singing voice reproduced from the speaker is
compared to the singing voice of the singer. There is a problem that it is difficult to hear good
pines, and you can not get good effects. The present invention intends to provide a microphone
mixing circuit which is effective and yet simple in view of such a point k. An example of the
present invention will be described below with reference to FIG. In Fig. 1, (1) indicates a stereo
signal source, for example, a cartridge of a record player if t, and the left channel signal from this
is equalized and amplified by an equalizer amplifier (2L) K and then a mixing circuit. The signal is
supplied to the main amplifier (4L) through (3L), amplified in power, and supplied to the left
speaker (5L), and at this time the signal of the right channel of the cartridge (1) is extracted by
the equalizer amplifier (2B). After being equivalently amplified, the main amplifier (4R) K is
supplied through the mixing circuit (3R), and the power is amplified and supplied to the right
speaker (5B). In the present invention, the microphone output is mixed as it is to one of the left
and right channels, and is delayed and mixed to the other. That is, the microphone (6) is
prepared, and the output thereof is amplified by the microphone amplifier + 71K and then
supplied to the mixing circuit (3L) K (2) and mixed with the signal of the left channel to be cosummary of the microphone (6) The output is supplied to the delay device αIK. Then, in the
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delay unit a1, the signal from the microphone (6) is amplified by the microphone amplifier fillK,
supplied to the delay unit a and delayed for a predetermined time, and the delayed signal is
transmitted through the buffer amplifier 0 and the low 1-loss filter. A mixing circuit (3R) K is
supplied to be mixed with the signal of the right channel. In this case, in this example, a BBD
(packet pre-gate device) is used as the delay unit 021. This BBDU is configured, for example, as
shown in FIG. That is, for example, 257 FETs (Ti) to (1) are provided, the drain and source are
connected in series with each other, the drain of FIT (T4) is connected to the input terminal anK,
and PE'r (% ,) @ Source is connected to the power terminal ■.
When the capacitor C0 is connected between the terminal I211 and the ground terminal (K), the
capacitors C1-Cm are connected in parallel between the source and gate of the FET (T,) to (1,),
and an odd number T) The gate of the PET #i is connected to the clock input terminal t24 of the
1st arm, '(the gate of the 85th even-numbered FBT is connected to the 2nd input terminal (g) k
Output terminal (i) K is connected through PET (Ta), (Tb) of 'rtm) source u7-siowa. The portion
described above, that is, the portion surrounded by the dotted line in FIG. And, the terminal
(support), (I) rake oscillation l! As shown in Fig. 3 from # 05, clock pulses (sync pulses) pa and pb
of 180 ° out of phase with each other are supplied. Therefore, the terminal voltage of the
capacitor C0 changes according to the signal from the amplifier α1). However, when the pulse
Pa is supplied, the switch FIT (T) is turned on. Transfer to capacitor C, through T). Then, when
the pulse Pb is supplied next, this l; FDFET (T! ) Is turned on, the charge on the capacitor C1 is
transferred to the capacitor C1 through PUT (T,). Then, when the pulse Pa is supplied next, since
FIT (Ta) is turned on by this tl, the charge stored in the capacitor C1 is transferred to the
capacitor C, when it is transferred to the capacitor C, PFtT (T). . At this time, the FET (T4) is also
turned on at the same time, so that the charge of the capacitor C0 newly charged by the input
signal at this (4)-is transferred to the capacitor C, through FIT (Tt). Thereafter, the same
operation is repeated for each of the pulses Pa and Pb, so that a delay signal can be obtained at
the terminal 弼. In this case, since the charge transfer of the capacitors C8 to C- is performed for
each of the pulses Pa and Pb, the delay time becomes longer as the frequency of the pulses Pa
and Pb lowers or the number of capacitors C0 to CtU increases. . Therefore, to increase the delay
time, the frequency of the pulses Pa and Pb may be lowered or the number of capacitors C6-C ゎ
may be increased. If the frequency of K pulses Pa and Pb is lowered to increase the delay time,
the input signal is sampled as pulse Pa and transmitted as a kind of PAM signal, so the
transmission band becomes narrow, while capacitor C0 If the number of Cps is increased, the
cost becomes proportionally high, and the yield of the integrated circuit becomes worse, and the
size becomes larger, so that it becomes more expensive.
Therefore, practically, for example, as described above, the number of capacitors 00 to ctmO may
be 256, and the frequency of Pa% pb may be set to about 1 OkHz in Pal (5), in which case the
transmission band is 5 kHz. , A delay time of 12.8 msec is obtained. In this way, the output BBD
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f13 of the microphone (6) is delayed, for example, by 12.8 ms and then mixed with the signal of
the right channel in the km circuit (3R) as described above. The filter is for removing the
components of the pulses Pa and Pb contained in the delay signal. At this time, the output of the
microphone (1) is mixed with the signal of the left channel without being delayed. Therefore, the
left speaker (5L) plays back his singing voice backed by the music from the record, and the right
speaker (5R) plays back his singing voice backed by the music from the record for a while Be
done. And when his own singing voice that is not delayed like this and his singing voice that is
delayed a little is played back, the echoes and reverberations are added to the singer in records
such as the song song Yabobura, so that a reasonable effect is obtained by k. In this case, a
unique effect different from this can be obtained. Also not delayed singing and delay (6)! Since
the singing voices are reproduced separately from the speakers (5L) and (5R), the singing voices
reaching the left ear and the right ear will be different, or if the body moves while singing, the
left ear Since the voice to reach and the voice to reach the right ear are further different, it is
possible to obtain an effect that can not be obtained by the conventional microphone mixing
circuit. In addition, since the singing voice reproduced from the left and right speakers (5L) and
(5R) becomes the same K, the effect becomes small by all means when the mixed signal of the
delayed singing voice and the delayed singing voice is distributed to the left and right channels.
Because of this, the delay time of the BBIX 121 must be increased, but in the present invention,
the delay time of the BBD 117J is reproduced since the non-delayed singing voice and the
delayed singing voice are reproduced separately from the speakers (5L) and (5R) K. Even if it is
short, the effects as described above can be obtained, and therefore, the BBD1 13it FET and the
small-sized one with a small number of capacitors may be used, and the yield when converting
BBIX 121 into IC is better than K. Furthermore, since the number of F'ffTs and capacitors of B8IX
[21 is small and the number of capacitors is small and there is no loss or distortion to the delay
signal, the # (7) which has no delay or distortion can be overcome. Ru.
As described above, according to the present invention, it is possible to add to the singing voice a
unique effect that can not be # 'ii by the conventional microphone mixing circuit, and to enjoy
the pleasantness as if a real singer are singing. it can. Moreover, it is as simple as 1 or 1
statement for that purpose, and also cheap. In the above description, the BBD fi 21 is used as a
delay unit, but a CTD (charge transfer device) of C0D (charge coupled device) can be used, and
the delay time is, for example, 60 m. If it is set to seconds or more, effects different from the
above can be obtained.
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