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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of a
mixing circuit of the present invention. 1 is a bridge circuit, 2 is a variable resistor for balance
adjustment, 3 is a preamplifier circuit for microphones, 5 is a radio tuner circuit, T is a
preamplifier circuit for recording and reproduction, 8 is a head, 10 is a reproduction and
recording mon. ← For main ann circuit, a and b are first terminals, c and b are second terminals,
So is a radio tag switching switch, S2 @, S2 and S3 are recording / reproducing switching
switches. 1 33 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing (broad)
path in which two different recording or reproduction inputs are mixed, recorded and
reproduced in a tape recorder, and in particular, by a single balancing variable resistance. Shown
in the drawing is considered to achieve the adjustment of the mixing ratio of the two powers
(hereinafter referred to simply as balance adjustment) in the mixing during sound (hereinafter
referred to simply as mixing recording) and in the mixing during playback (sussian mixing
reproduction). According to one embodiment of the present invention, (1) is a bridge-path formed
by connecting four resistors (R,) (xXRJ) (L) in an annular connection, A pair of il magazines axb)
between the two fixed '-\,) e 趨 0': 5 酎 09 鵜 stop i 往 fry <57 nosing variable resistance, (3)
input l1llVc microphone (4) Connected The output side is one of the first terminals (microphone
Japan preamplifier circuit connected to the switch, (5) is a preamplifier path for recording and
reproduction, which will be described later from the radio tape cut-off switch (So) K, selectively
the # 11 terminal The radio tuner circuit connected to the other (a), (7) is interlocked with each
other, and the recording and combining head (8) is input or output from the recording (1) On the
other hand, in the recording * liveback Brian 8 circuit connected in 1 C, the input side of the
input circuit 7 is connected to the other pair of the bridge circuit 1 via one of the recording /
reproducing changeover switch S1. One of two terminals (C) is connected to K, and the other (d)
of the second terminal is connected to the output side of the input side of the playback and
recording monitor main amplifier circuit QO to which the speaker (9) is connected. Further, α〃
is a bias oscillation circuit which supplies an alternating current bias to the head (8) at the time
of recording. In such a configuration, when recording is made with the vowel playback selector
switch l) Tsuru) and i'GII3) switched to the side), the radio tape selector switch (S (11 is as shown
in the illustration 4% (Ra side)) When switched to, the output of the radio tuner [5] and the
output of the microphone preamplifier circuit (7) are balanced to the resistance φφ
(immediately mixed and the mixing ratio of the bridge circuit (1)! After being adjusted by the
variable resistor for M (2), it is supplied to the head (8) together with the output of the bias
oscillation circuit (b) through the preamplifier for recording and reproduction in the same order
7). Therefore, it becomes K that mixing recording of radio output and microphone output can be
performed. Here, the output of the radio tuner circuit (5) and a part of the output of the four
preamp circuit (7) are mixed from the other resistance of the bridge circuit (1) west) K after the
main for reproduction and recording monitor Since the signal is supplied to the speaker (9)
through the amplifier circuit αO, it is possible to monitor the mixing recording.
On the other hand, when the radio tape selector switch (S,) is switched to the (1) side at the time
of playback when the recording / reproduction switch (S,) φ1) (81) is switched to the head (8)
The output -1 of the preamplifier circuit (7) which receives the output of b) and the output of the
microphone preamplifier circuit (3) Since the mixing ratio is adjusted to the variable resistance
(2) K and then supplied to the main amplifier circuit 01, mixing reproduction of the tape
reproduction output and the microphone output can be performed. It is needless to say that
mixing reproduction of the radio output and the microphone output can be performed when the
radio tape switching switch 0) is switched to <Ra) side at the time of the reproduction. Here, the
resistance values of the resistance west) crane) (to) 04) and the variable resistance (2) should be
considered. That is, by taking each resistance value to several tens of ohms and taking one of the
resistances) to the resistance of the other (west) to the other) west) in particular, it becomes
unnecessary when mixing and reproducing. The effect of the resistance (R,) can be eliminated.
Note that, for reference, each resistance is R, = 10, n1R, = 89KQRs = 12 in the above
embodiment. ΩJ4 = IOK! 7. Father The resistance of the above variable resistor (2) + 1 MR vlduv
= 20 x Ω. In the above embodiment, the microphone output and the radio tuner output have
been described as two external inputs in which one or the other is mixed with the tape
reproduction output at the time of mixing recording and mixing reproduction. Etc. may be
different. As described above, according to the present invention, it is possible to achieve balance
adjustment at the time of mixing recording and mixing reproduction by a single variable resistor,
and it is not necessary to additionally add a recording / reproducing switch for this purpose. Is
practical as a mixing circuit for a tape recorder.
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