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JPS5193203

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DESCRIPTION JPS5193203
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram of a conventional
example, and FIG. 2 is a connection diagram of an example of the present invention.
6L,6Rはメインアンプである。 Fig. 1-5-51-93 203 (2) l Fig. 2-6-
Detailed description of the invention: When the left channel signal of the 1, -2 channel stereo
signal is L and the right channel signal ftR is used, the signal to the speaker in front of the
listener's left (L -ΔR) (Δ is a function of IIl wave number, and when supplying a signal (B−ΔL)
to the front right speaker, stereo reproduction can be performed with a spread larger than the
interval between those speakers It has been known. There is such an audio matrix type stereo
device as shown in FIG. That is, in FIG. 1, (IL input (IR) is an input terminal, (2L input (2R) is a
tone control circuit / volume control ** circuit, (5 persons), (5B) is a mode switch (shown in
stereo state)) , +71 Fi head phone, and the signal is supplied to the transistor (3L) through the
terminal (IL) and the multiple circuit (2L) to take out the signal and -L to its collector and emitter
respectively. At the same time, the signal B is supplied from the terminal (l) to the transistor (3R)
through the circuit (2R) and the signals 8 and -8 are outputted to its collector and emitter
respectively. Then, the signal -12,-"-B from the transistor (3) is supplied to the filter (4R) K to be
the signal -.DELTA.B, and this signal -.DELTA.R is transmitted through the switch (5A) to the
transistor (3L). And the signal (L-.DELTA.R) is added to the signal (L-.DELTA.R) through the main
amplifier (power amplifier) (6L) and through the switch (7A) linked to the headphone jack (7 :). It
is supplied to the left speaker (8L). Also, the signal from the transistor (3L) is supplied to the
filter (4L) to be the signal -.DELTA.L, and this signal -.DELTA.L is added to the signal R from the
transistor (3R) through the switch (5B) The signal (R-.DELTA.L) is supplied to the right speaker
(8R) through the main amplifier (6R) and through the switch (7B) of the jack (7). Accordingly, the
sound of the signal (L-.DELTA. ') II (R-.DELTA.L) is reproduced from the speakers (8I.quadrature.)
And (8 ft), that is, stereo reproduction is performed. When a headphone plug (not shown) is
inserted into the jack (7;), the switches (7A) and (7B) are turned off, so the speakers (8L) and (8)
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1 are turned off. (31'λ '). Also, at this time, the switches (7C, 71D) of the jack (71C, 7D) are
turned on, and the outputs of the filters (4L, 4R) are bypassed. And 6R are respectively supplied
with the signal L% R.
Therefore, in this case, stereo reproduction can be performed by means of a hedonopon.
Furthermore, when the switches (5A) and (5B) are switched to the state opposite to the state
shown in the figure, the switches (5A) and (5B) are used regardless of whether the jack (7: is
plugged in) The signal L% nK signal −ΔR 1 −ΔL is not added, and the signal R is added to each
other to be a monaural signal (L + R), which is supplied to this signal (, L + R) kaan j (6L), (6B) Ru.
Therefore, monaural reproduction can be performed by the speakers (8L), (8R) or headphones. In
this configuration, the filter (4L input (4R) becomes the load of the transistors (31,), (3L) at the
time of stereo reproduction with the speaker (8L input (8R)) in the configuration like this. It is
disadvantageous. In addition, the operating points of the transistors (3L) and (3R) and the design
of the filters (4L) and (4R) become 1R, and the optimal operation t-performs K <. Since the
transistors (3L) and (3R) enter the signal path at 14 + −− 5 mystery, etc., the noise point is
disadvantageous. The nine jacks (7) must be interlocked with as many as four switches (seven) to
(7D), which is complicated and is a source of failure. In light of these points, the present
invention seeks to eliminate these drawbacks. Therefore, in the present invention, as shown in
FIG. 2, for example, the outputs of the main amplifiers (6L) and (6R) are sent to the amplifiers
(6R) and (6L) through the 74 luta (4L) and (4R). It injects in a reverse phase seeing from L, and it
is K so that signals (L-ΔR) and (R-ΔL) may be obtained. That is, in the example of FIG. 2, an
amplifier (IL). (6R) is an in-phase amplifier, and the transistors (6A) and (6B) of the first stage are
grounded to the emitter, and signals from the terminals (IL) and (IR), R is a circuit (2L). The
signals are respectively supplied to the bases of the transistors (6A) and (6B) through (2R). Then,
the output end of the amplifier (6L input (6R) is taken as the moving contact aK image of the
normally closed switches (7A) and (7B) interlocked with the headphone jack (71). (51. Rumors
The speakers (8L) and (8RC) are respectively connected between the fixed contacts and the
ground. The output terminals of the t + amplifiers (6L) and (SR) are connected to the jacks 71 (7A
input (7B) K respectively) through the volume control resistors (9L) and (9R) and the ground of
the jack 171 The ms point (7C) is grounded.
Further, the contacts of the switches (7A) and (7B) are connected to the filters (4L) and (4R) and
the mode switch (5B) (5A) through the amplifiers (6R) and (6L) transistors (6B) and (6A),
respectively. And a mode switch (5C) is connected between the input ends of the amplifiers (6L)
and (6R). According to such a configuration, when the +1 switch (5A), (5B) is turned on and the
switch (5C) is turned off as shown in FIG. 1, stereo reproduction with a speaker (8 L (8 pcs)
inserted) is performed. To be done. すなわち、アンプ(6L)。 When (6R) is signaled and R is
supplied, it is assumed that signals (L−ΔfL) and 1−ΔL) are obtained at the output terminals of
the amplifiers (6L) and (SR). Then, the signal (R-ΔL) from the amplifier (6R) is supplied to the
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filter (4R) through the switch (7B) to be converted into a signal (R-m L) (61 '). Since Δ1 is 1,
since Δ210, Δ (R−ΔL) − = ΔR, and this signal ΔR is supplied to the emitter of the transistor
(6A) of the amplifier (6L). However, in this case, the transistor (six) has a phase opposite to the
base input and the emitter power, so that the signal is supplied from the circuit (2L) to the base
and the filter (4R) to the emitter. When the signal ΔR is turned on, the signal L6 of the human
power base ( And the signal ΔB at the emitter input are added in opposite phase to each other to
be a signal (L−ΔR), and this signal (L−8R) is amplified and extracted in the amplifier (6L).
Because of this, as described above, the signal (L−Δ) L) is obtained at the output end of the
amplifier (6L). Similarly, a signal (R-ΔL) is obtained at the output end of the amplifier (6R). The
signals (L-.DELTA.R) and (H, -.DELTA.L) from these amplifiers (6L) and (6R) are supplied to the
speakers (8L) and (8R) through the switches (7A) and (7B). . Therefore, stereo reproduction is
performed with a speaker (8 L input (8 R)) with a spread of (7)> or more above the interval.
Further, in this state, when the headphone plug is inserted into the jack 17+, the switches (7A)
and (7B) are turned off, so the speakers (8L) and (8R) are turned off. At this time, the filters (4L)
and (4R) K signals are not supplied, so the signals from the amplifiers (6L) and (6R). R will be
taken out.
Then, the signal from the amplifier (6L input (6R), R is supplied to the contact point (7L input
(7R)) K of the jack (7) through the resistor (9L input (9B). Therefore, signals are supplied to the
headphones, and R is supplied (K), and stereo reproduction by the headphones is performed from
this K. On the other hand, if the switch (5A ON (5B) is OFF and the switch (5C) is ON, the switch
(5A ON) and the plug (7) may be inserted or not. スイッチ(5A)、(5B)がオフなので、ア
ンプ(6L)。 Since the signals Δ 几 and ΔL are not supplied simultaneously to (6R) and the
input ends of the amplifiers (6L) and (6R) are shorted to each other through the switch (5C), one
circuit (2L) and (2R) , And is a monaural signal (L + R) 81, and this monaural signal (L + R) is
supplied to the speakers (8L), (8R) through the amplifiers (6L), C6R, and so on, so Monaural
playback is performed. And in this case, according to the present invention, at the time of stereo
reproduction by the speakers (8L) and (sR), the filter (4L). While (4R) becomes the load of the
amplifier (6L input (6R), it becomes the emitter load of the transistors (6A) and (6B). The
impedance of the filters (4L) and (4R), the impedance of the speakers (8L) and (8R), and the
impedance of the emitter resistors of the transistors (6A) and (6B) can be made sufficiently large.
. There is no distortion even if it becomes such a load. Further, since the transistors
corresponding to the transistors (3L) and (3R) of the device of FIG. 1 are not required, distortion
is reduced as well as noise is reduced. Furthermore, since the filters (4L) and (4R) can be
designed independently of other circuits, optimal operation can be performed. Also, since only
two switches (7A, 7B) are linked to the jack (7; 7), the m-rate is (9 :, '\ j, noise, failure is reduced).
Furthermore, the cost reduction can be realized by making the transistors (3L) and (3K) of the
circuit in FIG. In the above description, the signals ΔL and ΔR from the filters (4L) and (4R) are
supplied to the emitters of the transistors (6A) and (6B). If there is, it may be supplied to other
points. Also, when the amplifiers (6L) and (6B) are reverse phase amplifiers, it is a signal.
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It is good to supply the point from R to the same phase. Furthermore, in the above-mentioned
busy case, filters (4L), (4R) (D pass characteristic is assumed to be Δ, and Δ2L, Δ 冨 R> 0 is
ignored for simplicity. However, it can be important whether it can be ignored or not. As a result,
the pass characteristics of the filters (4L) and (4R) may be selected so that the outputs of the
amplifiers (6L) and (6R) are (L-ΔR) and (R-ΔL).
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