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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of
the present invention. 3 иии Amplifier и 4 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и built-in speaker 7 и и и и и и и и и external speaker, 8 и и и ииииplug.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic
mounting which has a good speaker and has a connection terminal for an external speaker, in
which the built-in speaker and the external speaker are operated immobile. Acoustic equipment
such as radio or tape recorder etc. with one speaker inside: In the speaker, the speaker has a
ratio ? ?, ?, an axial small-diameter one, and the allowable input is ?'Jt-> ///,) ^! (2) Because
the input is large, distortion is likely to occur, and parts in the device resonate due to the
vibration of the built-in speaker, generating chattering noise, and it is inconvenient to obtain a
large output from the internal speaker. For this reason, there are some which are provided with
terminals for external speaker contact, and can be operated to operate the external speaker when
obtaining a large output, but in this case, switching to the built-in speaker every time the external
speaker is used It was awkward and inconvenient because it had to be adjusted in volume and it
had poor operability. In the present invention, the operation of connecting the external speaker
automatically supplies the large output to the external speaker, and the operation of the built-in
speaker automatically supplies the small-scaled output. Let's explain about the tape recorder
using sections and songs. 1 is a magnetic tape, 2 и, i its reproduction head. The reproduction
signal is amplified by the output signal of amplifier 2 or amplifier 3 and its output is connected
to the external speaker connection. The voltage is supplied to the terminal a of the switch 4. In
this case, the terminal connected to the ladder a is usually connected to the built-in speaker 6
through the resistor 53, and thus the plug is not connected to the chassis 4 In-, the output of the
amplifier 3 is supplied to the built-in speaker 6 through the resistor 6, the output is attenuated
by the resistor 5, and the inner end speaker 6 is operated. On the other hand, the plug 8 и is
connected to the terminal a while the plug 8 и is connected to the terminal a by inserting the plug
8 to which the external speaker 1 is connected in the front 1 self shear or 4 vC. The output of the
amplifier 3 is released, and instead the external speaker 7 is directly connected to the output ?
of the amplifier 3, and the output of the amplifier 3 is supplied to the external speaker 7 without
attenuation. The terminal C of the chassis 4 is grounded. With the above configuration, when the
plug 8 is inserted into the chassis 4, the output of the amplifier 3 is supplied as it is to the
external speaker 7, and therefore the external speaker 7 is driven with a large output. On the
other hand, if the plug 8 is removed from this state, the built-in speaker 6 is supplied with the
output 4 of the amplifier 3 which is automatically attenuated by the resistor 5, and hence the
sound emitted from the inner speaker 6 without requiring a fan adjustment operation. Distortion
is prevented.
The same applies to an audio device other than a tape recorder, and the structure for connection
of an external speaker is the same for other connection terminal structures. As apparent from the
description of the present invention or one or more of the above, the output of the amplifier is
attenuated and supplied to the implosive speaker, while being supplied to the external speaker
(without being attenuated, For example, when driving an external speaker in place of the inner
speaker, and when switching from an external sound repulsive force to a peak speaker, the
adjustment operation is not required for the sound. In this case, it is possible to drive off with a
small output, and in particular to prevent distortion during driving of the inner vertical speaker
automatically, and its practicality is great.
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