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JPS56176600

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DESCRIPTION JPS56176600
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of an automatic wide
switching device of an amplifier circuit of the present invention. 3
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 3 3 3 3 4 3 4 Left channel
amplification circuit 4 right channel amplification circuit 5, 6 supply path 7.8 switching
transistor 10 ииииии Jack switch.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stereo
amplification circuit having a wide mode F, wherein the automatic wide switching device of the
amplification circuit is such that an ordinary stereo mode is established whenever the head plug
is attached to the jack. In the stereo amplification circuit, when the right and left speakers are
close, changing the phase of the channels inserted by -4 ░ to each other to add a signal, -8 "//
f711??2 to each other in order to give a sense of stereo It is generally busy. The drawback of
this method is that the midrange sound is missed. Especially when listening to music or the like
with the head 7 on, this tendency is large and the music or the like to be reproduced becomes
unnatural. Therefore, the present invention provides an automatic wide switching device for an
amplification circuit which always turns to a normal stereo mode when the head 7 on plug is
inserted into a jack, and will be described below with reference to the drawings. (1) is an antenna,
and a tuner (2) is connected to the output side. + 31 (41 is a left channel amplifier circuit and a
right channel amplifier circuit connected to the output side of the tuner circuit (2), and some of
the signals of the left channel amplifier circuit (3) and the right channel amplifier circuit (4) are
phased tl-changed and extracted, and added to the right channel amplifier circuit (4) or the left
channel amplifier circuit (5) which respectively extracted the above signals via the supply path
+51161. The switching transistors (7) and (8) are connected to the supply path 15 + 161, and
are turned on / off 6 by the switching transistor +71 (81ti circuit switch +9) tiI. A housing H is a
speaker connected to the jack switch f91fi. Next, the operation of the present invention will be
described. Now, when the FM stereo broadcast signal is received by the antenna (1), it is
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amplified, frequency-converted and further detected by the tuner circuit (2) to generate a left
audio signal and a right audio signal. 'The left audio signal and the right audio signal are
respectively added to the left channel amplifier circuit (3) and the right channel amplifier circuit
(4) and amplified. When the head 7 on plug is not inserted in the jack, the amplified left audio
signal and right audio signal are connected to the jack switch (9) to the connecting piece (1: I
(14) (l information 1e). Speaker housing 1) UK supplied and drives the speaker a?0. By the way,
part of the signals of the left channel amplifier circuit (3) and the right channel amplifier circuit
(4) are changed in phase and extracted also to the supply path L51 (6).
At this time, a bias voltage is applied to the pace of the switching transistor (7) (81 via jack
switch + 9) QO contact (1: 1141 (d) (L), and the switching transistor 71 (81 is turned on
Therefore, the extracted signal is extracted and applied to the right-channel amplifier circuit (4)
and the left-channel amplifier circuit (3), which are in a series of fourteen, to become a wide
mode that makes the sound spread. Next, when a head 7 on plug (not shown) is inserted into the
jack, the left audio signal from the left hand left column amplifier circuit (3) and the right
channel amplifier circuit (4) is turned on via the resistor (17) ns. And a right-handed signal are
added to reproduce these signals. At this time, the contact piece 131 (141 ?! Since 9tie is turned
off, the switching transistor + 71t8 + is also turned off and no signal is extracted to the supply
path +51 (6) from the left channel amplifier circuit (3) and the right channel amplifier circuit (4).
Therefore, it becomes a normal stereo mode and can enjoy the natural performance. As described
above, in order to increase the sense of sound spreading, the signal extracted by changing the
phase from the left channel amplifier circuit or the right channel amplifier circuit is extracted as
described above. When the head 7 on plug is inserted when the head 7 on plug is inserted into
the jack, the supply path to be added to the right channel amplification circuit or the left channel
amplification circuit which is different from 5 is automatically disabled when using the head 7 on
The stereo mode makes it possible to listen to natural performances.
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