JPS49124003

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DESCRIPTION JPS49124003
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of an embodiment of the
amplification device of the present invention. 3 ... 1st resistor, 4 ... 2nd resistor, 5 ... switch, 6 ...
1st amplifier, 7 ... 2nd amplifier, 11 ... 11th 3 amplifiers. −７−
[Detailed description of the device] Body! Regarding the JFFi @@ device, it is assumed that a
simple device tube that acidifies a monaural signal to a stereo signal at the time of reproduction
or at the time of bell sound with a tape recorder or the like. For example, there is a system in
which all of the music is explained at the time of reproduction of the stereo bell-belled music
tape, and the song t5 is played according to the music. Then, the reproduction of the mini-thick
tape is performed in stereo, and the commentary and the song are often performed in monaural.
In this case, monaural signals such as commentary and songs are amplified by the respective
channel D amplifiers, and it is easy to see when the volume of each speaker is increased. The
present invention provides an amplification device for combining a stereo signal and a monaural
signal as described above. An embodiment of the above will be described with reference to the
drawings. Of the stereo signals, 21 amplification 6 amplifying at the open side and amplification
iS7 at the other channel 22 t11il 1111 and a second amplifier amplifying the monaural signal
noise 7 and 11 amplifiers 11 are provided respectively for amplifying 7 and monaural terractors.
It is assumed that the signal is connected to the input terminals 1 and 2 Fi stereo signal II (IQ
shown) of the tenth amplifier · and the second amplifier 7 described above. It is assumed that the
output terminals 8 and the sFi speakers (not shown) at each of the above-mentioned increases
@@ 6, 7 are connected to the cloudy sound head (not shown). The third amplifier 11 is connected
at its input terminal to a signal source such as the microphone 10, and the output side thereof is
one of the switching terminals of the changeover switch 6! 1ail is being scolded. The other switch
terminal a of the changeover switch 6 is turned to a common ground point, and the common
terminal is turned to an open terminal Kll of the first resistor 3 and the second resistor 114. The
terminals of the first resistor 3 and the second resistor 164 company I110,000 are connected to
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the input terminal 1 and the input terminal 2, respectively. The operation of this device will now
be described. Now, the change-over switch S is not connected to the change-over terminal aliIc-)
4). Then, the stereo signal at the time of recording or reproduction is amplified from the input
terminals 1 and 2 to the first amplifier and second amplifier! It is amplified by 7 and appears on
the j output terminal 8.9. When the switch is switched to the switch st-switch terminal blI, the
company performs the following operation. That is, the output impedance of the third amplifier
11 is set to be much smaller than the resistance value of the first resistor 3 and the second
resistor 4, and the input ladder 1 and the input terminal 2 [ (The stereo signal seen is the first
amplifier 6 and the second amplification a! Without causing interchannel talostalk.
It is amplified by Y. On the other hand, the monaural signal from the microphone 4 phone 1o is
amplified by the 23 amplifiers 11, and the 1 input terminal 1 and the input terminal 2 Vc can be
obtained through the changeover switch 6, the first resistor @ S * and the resistor 114 ,
Therefore, the first increase @ l! The 16 and the second $ 1i 417 amplify the stereo signal of
each channel and at the same time amplify the third amplifier 11 one word. Therefore, it is
possible to synthesize a comment or a song for the record 4 to 0) to the title of the reproduction),
6. When the resistance values of the tenth resistor 3 and the second resistor 4 are set to the
same value, the monaural signal from the third amplifier 11 is transmitted to the first amplifier 6
and the second amplifier 7. Each has the same size q) ratio. As a result, since the audio signal (if
the stereo signal is heard separately on each channel) and the monaural signal is heard from the
center of the speaker (Ill not shown) of each channel, it becomes extremely silent. In the
embodiment of the present invention, one terminal of the first resistor 3 and the second resistor
l114 is connected to the input terminal 1 and the input terminal 2 in this embodiment of the
present invention. ! The same effect can be obtained by connecting each of the amplifiers 7 * of
the amplifier 7 to the * signal path. As described above, in the amplification device of the present
invention, the amplification of the stereo signal is performed respectively by increasing h21 and
the signal path of the second amplifier from the o-th amplifier to the O signal t first resistor and
y! Because it is added via resistance IIIvt of 2, the stereo signal and the monaural signal O
synthesis can be performed very easily 吠吠-C2 に対する ', 16-0 and it is possible to mix the
commentary and the song for the music. Since the output impedance of the eighth amplifier is
sufficiently lower than the resistance value of the first resistor and the second resistor, the stereo
signal is not deteriorated and the stereo signal is not degraded. Can be combined with the
monaural signal. Furthermore, by making the resistance value of the first resistor and the
resistance value of the second resistor the same value 19, the ratio of the monaural signal
metallized to the stereo signal can be made the same in each channel. A monaural signal such as
S 中 song to a sound collection is heard from the center of each speaker, and as a result, it has an
excellent effect tube that becomes very slow as a sound.
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