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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing one embodiment of
the present invention, FIG. 2 is a front view of an output connection terminal portion, FIG. 3 is a
circuit diagram of another embodiment, FIG. It is a perspective view of the connection case of
further another Example. L, R: Signal source 1.2.3 Output connection terminal 4: Switch.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection
terminal device which can easily select stereo and monaural. There is no particular problem if the
headphones or earphones are for stereo use when monitoring the output with an audio terminal
such as a stereo amplifier, a stereo tape recorder, or a television with an audio device having a 2channel stereo output, for example If it is monaural, you will only hear the sound of one channel.
Depending on how the program is created, the contents of the left and right sounds may differ
greatly, for example, the sound of a certain instrument may be heard from one side and may not
be heard from the other at all. In order to eliminate such unnaturalness, it is sufficient to provide
switches for left and right mixing, but this is costly, and it is also possible to hear an unnatural
sound in the wrong mode if switching is mistaken. There is something I do not notice though.
The present invention solves such a problem and C's embodiment will be described with
reference to the drawings. In FIG. 1, L is the signal source of the first channel, R is the signal
source of the second channel, R + and R2 are signal level adjustment and input / output
impedance matching, or adversely affect the former circuit during mixing (eg recording It is a
resistance added in the sense of preventing the cross talk increase in a circuit etc.), etc. and may
be omitted if unnecessary. 1 is a first output connection terminal (jack or the like) connected to
the signal source of the first channel, 2 is a second output connection terminal connected to the
signal source R of the second channel, 3 is any signal source ( In this example, the third output
connection terminal connected to the second channel) has a switch 4 which closes or opens in
conjunction with connection of a plug (not shown) or the like to the terminal 3. In the above
configuration, when the signal of each channel is added to the signal source H, the case where
the switch 4 is first closed along with the connection to the output connection terminal 3 will be
described. If there is no connection to the terminal 3, the output connection terminals 1 and 2
are connected to the headphone and the earphone respectively, and the signal of the first and
second channels is monitored. People can enjoy stereo sound. If the same two earphones are
connected to the output connection terminals 1 and 3, the switch 4 is closed, the signals of both
channels are mixed through the resistors R1 and R2, and monaural signals are output to the
output connection terminals 1 and 3. Because it is output, you may listen to this with both ears
alone or with two people.
Furthermore, if an earphone is connected to the output connection terminal 2, a monaural signal
can be simultaneously heard by three persons. In this case, it is easy to understand if the display
of the output connection terminal portion is as shown in FIG. 2, for example. 11.12 ° 13
correspond to the output connection terminals of 1, 2 ° 3 in FIG. 1, respectively. The above is an
example of the case where there are three output connection terminals. However, as shown in
FIG. 3 when there are insufficient output connection terminals, 1 'for 1 and 2' for 2 in parallel
with each output connection terminal. The output connection terminals may be connected in
parallel, such as 31 for 3 and so on. Furthermore, although the above can be carried out in the
form of being incorporated in an apparatus, as shown in FIG. 4 as it can also be configured as a
single accessory, the plug 26 is provided on one surface of the housing 20. For example, the first
channel contact 25L1 and the second channel contact 26R1 ground terminal 25E are provided.
The output connection terminals 21, 22 and 23 correspond to 1.2.3 in FIG. The output
connection terminals (jacks) may be distributed and arranged not only on one surface as in this
example but also on a plurality of surfaces other than the surface having the input plug. As
described above, according to the present invention, monaural-stereo switching can be
performed by changing the way of inserting the plug to the output connection terminal without
providing a changeover switch or the like, so that visual distinction is easy and error-proof, etc. It
is a simple structure with a large effect.