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JPS50114209

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DESCRIPTION JPS50114209
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electrical connection diagram showing an
embodiment of a stereo signal switching apparatus according to the present invention.
Description of major drawing numbers, 4 · · · Right signal transmission line, 5 · · · E · First jack, J-2
· · · Second jack, SP-1 · · · First internal speaker, SP-2... Second internal speaker. −19−
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stereo signal
switching device K11l, and in particular, a plug can be inserted into one of the specific output
jacks so that a sum signal of left and right signals can be derived from the plug. It was
constructed in If an external output jack is provided in the stereo device so that the left and right
signals KMI15 can be used to listen even to external earphones if they are stored, connect the
earphones to only one of the output jacks. If this is the case, one of the stereo signals from the
earphones will not be heard. In this case, it is convenient if it is possible to listen to the sum
signal of the left and right signals from one earphone. Furthermore, when the earphone is
connected to 1, the internal speaker circuit of the company is disconnected but when the
earphone is connected to only one output jack, as described above, the earphone enables
listening to the sum signal of stereo signals from the earphone. It would be particularly
advantageous if the internal speaker circuit corresponding to the unconnected output jack could
also be disconnected. The present invention is proposed and will be described in detail below
with reference to the embodiment shown in FIG. 3 is an electrical connection diagram of a stereo
signal switching device according to the present invention. Figure number fl + # 'i stereo tuner,
figure number (! l # i right signal amplifier, book +31 Fi left signal amplifier, the right and left
signals derived from the stereo tuner fi + are respectively transmitted through the right signal
transmission line (4) and the left signal transmission line (St The first jack (J +) and the second
jack (J-2) K are respectively applied (amplified by respective amplifiers on the way). The shutter
normally connects the signal transmission line to the internal speaker, but when a plug (not
shown) can be inserted, the shutter is disconnected from the internal speaker and the signal is
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led out through the plug. The figure number J is a switching circuit composed of the swing aI- (81) and the second jack (J-8-2), which are switched when the jack (J-1) K plug of 艷 1 is inserted.
is there. Switch (2) K plug is inserted and switched at 9 o'clock Switch (peak Δ-shaped insertion
8-1) (8-2) is inserted into the jack and not inserted 111 And when the plug is inserted contact
point O (roll over the shoulder. When the plug is not inserted into the jack #i (state 111 shown),
the right signal is applied with the first internal speed (8P-1) K, and the left signal is the
twentieth internal. The speaker (BP-2) K is applied to perform stereo reproduction.
When the plugs are inserted into both of the front and rear jacks, the internal speaker circuit is
disconnected together and the signal is led to the outside through the plug, enabling stereo
reproduction with the external speaker or earphone. When the plug is inserted and only the first
jack (J-1) K is shaken, the contact of the switch (51-1) is rolled to 0 伺 and the left signal
transmission line (6) is cut and the left signal transmission The line is connected to the right
signal transmission line K) and the left and right sum signals are derived from the outside IIK so
that monaural reproduction is possible with the outside 1101 speakers or earphones. According
to the stereo signal switching device, the plug is inserted in both of the two jacks and stereo
reproduction is possible with an external IIO speaker or earphone>, the plug is inserted in one
specific jack and is round The left and right O sum signal is led out IIK through the talk plug, and
monaural playback is possible with one external speaker or earphone, and the internal speaker
path corresponding to the h jack KM not inserted 5 Because it can be cut off, it is a very practical
use. 4, O simple W drawing! Fig. L is an electrical connection diagram showing an embodiment of
such a stereo signal switching device according to the present invention. Explanation of main
figure numbers (4) is right signal transmission line, (i) 紘 left transmission line island, (! 1 is a
switching circuit, (J-1) is a first jack, (J-'1-2) Fil12's jack, (8F-1) allll's internal speaker% (8F-2) is
an internal speaker of hall 2 practical use寮 寮 鐙 三 欅 自 社 own company 自 社 1 1 I (-'□ / S25 I /' j-2 乎 乎 / / − / / / / / / / 2 川 新 出 願 = = = − \ 代表 井 \ representative 、, mouth
42094-'
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