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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an example of a
conventional microphone mixing circuit (7), and FIG. 2 is a circuit diagram showing one
embodiment of a microphone mixing circuit incorporating the present invention. FIG. 3 is an
external view of an example of a switchable variable resistor which realizes the present invention,
and FIG. 4 is a detailed view of an example of a connecting portion of the switchable variable
resistor. In the figure, 1 is a variable resistor portion, 2 is a switch portion, and 3 is a connecting
portion between a resistor rotary shaft and a switch. In the drawings, the same reference
numerals indicate the same or corresponding parts. Figure 1 Figure 2
Detailed Description of the Invention In this invention light, the source side (the side to be mixed)
of the microphone mixing circuit in the audio amplification circuit. 汐 II に 関 す る relates to a
circuit for adjusting the mix ratio of the record signal) and the microphone 1llll (mixing side). The
microphone mixing circuit is used for the purpose of mixing a monaural microphone signal with
a stereo source signal in a stereo pre-main amplifier (5)! -7-\-evening. The mixing ratio is a ratio
or a variable ratio, but the variable ratio is easy to use. It is one in the past. Mixing ratio I! An iIl
adjustable microphone mixing circuit diagram is shown in FIG. In FIG. 1, 11 is the source side left
channel signal source pressure, t2 is the source side stone channel source voltage, ri is the left
channel signal image resistance, r2 is the right channel signal source resistance, AMP is the
microphone signal amplifier, ro is the ro The internal resistance of the microphone amplifier, 6m
is the output pressure of the microphone amplifier A, VR is the mixing adjustment variable
resistor (VRI and VB2 are in the same movement, and VRI1 is for the left channel VR2iz right
channel) , E3 is the left channel mixed output vehicle pressure The4i right channel mixed output
town pressure, R5 is the left channel load resistance, and 6 is the right channel negative
resistance. The microphone signal and the source tall signal are mixed with K through the
microphone amplifier via the VRI and VR2 mixing ratio adjustment variable resistors on the
source side signal lines of both left and right channels as shown in FIG. Output voltage Kea 0 0
mixed output at this time, about 5. Ding R2 (2)! 左 Left channel mixed output voltage (m) Mu (屁
/) L1 + 几 5) tl + (R57R2 十 R6), which can be obtained as shown in equation (2), respectively. ·
(1) where R's = R2R5 / 1 + 2 + R5, Rs = Rt 几 5 / (approximately 1 + R5) right channel mixed
output 1 pressure (t4) t4 = () 46 /) L3 + R6) t2 + (1 'L6') / R4 + R6) (2) where B = a4R6 / (R4 + 几
6), R6 ′ = R3hptR3 + Rs) * rl, r2. ro is I (l + n2. 0 because it is smaller than R3 + Ra, Rs, Rs 0 so
ignored, thus mixing output of source signal and microphone signal? The output 1 pressure can
be obtained by The mixing ratio can be adjusted by changing each of R2, Ra, and R4i.
R3 = 0 and only the source 唄 11 must be added to the output, but this and (3) customs-bending,
the signal source internal resistance rl, rl can not be ignored and the left channel also has n
microphone signal components (+3 ) + 3 # (rl / R2) tm (rl << R2, rl << R5) == + 31 right channel
is also n microphone signal component (t4) t4! (R2 / 4 (4) or (rl (桐, rl << 63 ... (4)), the signal of
the microphone is also sent to the source) In the t state where the VRf source lllll is turned off,
only the source lll signal can be set to the output amount pressure, and even if it is a force 7+) no
microphone signal component can be generated. Also the left and right channels on the source
side? Although it is desirable not to interfere, it also receives a shadow 41 of rl, rl, ro, n voltage
(+3) t from the right to the left channel: '; (ror2 / lRt + R2) tR3 +) + 4)) + 2. 15) 'Jbf' L pressure
from left to right channel ctatt X = (ro, rt / l Rt + approx. 2 ha u3 + f4a)) tl----t61 i 51. The signal
of the right channel goes to the left and the signal of the left channel to the right at a ratio V
shown in the + 6i equation, and one cross-over force 5 is generated. (4) In order to remove the
defects of f 'Lfc, the source signal is generated by disconnecting the circuit by receiving the
switch connected to the variable resistor for adjusting the mixing ratio and disconnecting the
circuit from the source 911 j. The present invention is to provide a microphone mixing circuit
which can obtain a KELR of a mixing ratio 1: 0 of a to-microphone signal and at the same time
eliminate cross talk of the source 1 regular channel output 1. Hereinafter, an embodiment of the
present invention will be described. Fig. 2 Svv is a switch interlocked with the VR devised to solve
such a gap. Fig. 3 is a drawing of the switchgear with switch 9 outside work. In this figure, (1) is
applicable to five resistors. (2) is the switch part, (3) is the connection of the resistor rotary shaft
and the switch @, FIG. 4 is a detailed view of the switch switching mechanism, (4) a cam, (5) 汀
switch cutting mechanism, (6 ) Is a resistor rotary shaft, + 71 m switch cover. When the
switchable variable resistor shown in FIG. 3 is used as in the second factor, this switchable
variable resistor can be switched to the source side by the cam shown in FIG. Since it is a
mechanism to turn off, when it turns it to the source side, Y side tube is selected when X 倶 II%
other than n.
Therefore, since the circuit similar to that of FIG. 1 is configured by connecting the source 7 to
the source + MI 1 and other than Y 91, the conventional function can be obtained. When the
switch is turned to the X side, it becomes independent of the left stone channel and the
microphone amplifier output. Therefore, if t4) or +41 is substituted for t3) and +41, 13 = 0. t4 =
0. Because there is no t component of the microphone signal either, it becomes a friend since it
becomes friends Vc, R2 = ■, R4 = ω at this time. Substituting in equation +61, t3 = 0. Since t4 =
0, crosstalk between the left and right channels is also eliminated. As described above, n
according to this invention is a simple circuit configuration, the influence of Shiniwa mochi
resistance plow, and the source of the variable resistor for adjusting the mix ratio l11: in the
position. All (A circuit that is not affected by the love effects of the microphone amplifier? Can be
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