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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram of the conventional
voice output circuit connection device, FIG. 2 is a connection diagram of the voice output circuit
connection device in one embodiment of the present invention, FIG. b is a side view of a two-pole
and three-pole head plug, respectively. A, B: 3 pole jack, 2a, 2b: earth terminal, 3a, 3b, 4a, 4b =
signal terminal, 7 to 10: resistance.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection
device of an audio output circuit for supplying stereo signals to headphones or i earphones.
Heretofore, as a connecting device of this type of circuit, there is one having two sets of jacks so
that two sets of jacks and one telephone can be connected. For example, the slave shown in FIG.
1/71. In the conventional apparatus, A and B are two sets of 03-pole jacks for stereo
headphones. Shacks A and B respectively have two sets of signal terminals 3a and 4a. ab, 4b and
earth terminals 2a, 2b. 12 and 1 'are terminals for connection of stereo sound output, R
represents a right channel signal and L represents a left channel signal. These stereo headphones
are used for small portable stereo FM radios, tape recorders, cassette recorders, radiocassettes
and the like. By the way, although such commercially available stereo headphones are portable,
there has been a drawback that the reproduced sound leaks to the outside, is not sufficiently
small, and becomes too noticeable when worn. Also, earplug-type earphones, which are
conventionally used in conventional transistor radios and the like, do not leak sound to the
outside and are small enough to be hardly noticeable at the time of wearing. There is stereo-t ##
4. If it can not be used for \-'and it is inserted directly into a shirt as shown in Fig. 1, its plug
portion is for the structure for two-pole jack shown in Fig. 3 a. The 3-piece channel of audio
output is grounded and mono! As for le [, i egg 涛. There is also a drawback that can not be used.
, -M-. Based on the above point of view, the present invention is connected to an audio output
circuit that enables stereo reception using two monaural earplugs / spu-type earphones and also
allows use of the original stereo headphones. It is an attempt to capture the device. FIG. 2 shows
an embodiment of the present invention. The jacks A and B used here have the same structure as
that shown in FIG. 7 to 1 o are resistors R8, and the four resistors shown in the figure are
selected to have the same resistance value so as not to cause an imbalance in the output. The
wiring method is different from that of FIG. 1, and the signal end T-3a of the A jack and the B
jack signal terminal 4b are connected to the R channel wiring of the stereo signal through the
resistors 7 and 1 °, respectively. On the other hand, the signal end of the A jack 4a and the
signal terminal 3b of the B jack are also connected to the L channel wiring of the stereo signal via
the resistors 8 and 9, respectively.
And kidding. よう。 C, connected, f 'Lfrc 9 ya A (6, if you insert an earplug-type earphone with a
plug shown in Fig. 3a for mono laur, the left channel will also be jack B by jack A) (Since the
channel can be received, a stereo signal can be received by two mono-rail · tt # 4 'jacks.
Furthermore, if stereo headphones (shown in FIG. 3) connected to either one of the 11-jack A or
B are connected, stereo reception can also be performed. However, in this case, jack A and jack B
are mutually opposite (this is opposite channel, so be careful. As described above, according to
the present invention, it has a feature that stereo reception can be performed without any
modification even when using a portable earplug-type earphone or stereo headphone.