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JPH10336786

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DESCRIPTION JPH10336786
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
external selection system for audio output in which an internal speaker for audio output in a
wireless communication apparatus or the like and an output from an external speaker are
arbitrarily switched.
[0002]
2. Description of the Related Art As a conventional switching method of this type, as shown in
FIG. 3, for example, an input audio signal is passed through a switching / amplifying unit 1 so
that each output can be obtained. When a headphone or the like is connected to the headphone
connection terminal 4, the switch 11 is used with the input selection switch 11 on the b side, and
when the internal speaker 2 or the external speaker 3 is used, the input selection switch 11 is a.
Switch to the side to use.
[0003]
At this time, the selection of the internal speaker 2 or the external speaker 3 is determined by
switching to the a side or the b side of the speaker changeover switch 14.
[0004]
Furthermore, Japanese Utility Model Application Laid-Open No. 2-108278, "jack with switch" and
Japanese Utility Model Application Laid-open No. 3-77590, "Speaker input circuit switching
device" are all the same as the prior art described above. By using the contact piece, the input /
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output circuit is switched.
[0005]
However, in the prior art as described above, in the case of an ordinary radio or the like, an
internal speaker or an external speaker (a headphone jack is often provided).
When switching the three parties of headphones), for example, the audio output destination is
switched in order of priority from the internal speaker or the external speaker to the headphone,
or conversely from the headphone to the internal speaker or the external speaker.
[0006]
Then, when the internal speaker or the external speaker is selected (see FIG. 3), the switching
operation is two-way selection with the above-mentioned headphones, and it is impossible to
change the output destination by three-way selection. In order to realize this, there is a
disadvantage that the other two connections must be disconnected and further reconnected.
[0007]
The present invention was made to remedy this drawback of the previously known switching
scheme in speech output.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to
output the audio output of an internal speaker to an external speaker or headphone in a radio
communication apparatus or the like having an internal speaker. A switching control means and
an output selection switching means are provided so that the audio output can be arbitrarily
selected and switched by the amplification means and the audio signal switching means.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present
invention will be described in detail based on the drawings. FIG. 1 shows a switching / amplifying
unit 1, an internal speaker 2, an external speaker connection terminal 3, and a headphone
connection terminal 4. The microcomputer 5 and an output selection switch 6 for manually
determining an audio output destination.
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[0010]
Further, FIG. 2 is a flowchart of a control program executed by the microcomputer 5.
[0011]
Functionally explaining the operation of FIG. 1, “A” of the output selection switch 6 is an
internal speaker 2 (headphone priority), “B” is a simultaneous output of an internal speaker 2
and a headphone 4, and “C” is an internal speaker. 3 (headphones priority), “D” are set so as
to simultaneously output the external speaker 3 and the headphone 4, and “E” is set as audio
output of only the internal speaker 2 (headphones non-priority).
[0012]
On the other hand, the microcomputer 5 processes the input / output signal by the interface 51
based on the control program information stored in advance in the memory 52 according to the
input information of the output selection switch 6, and then performs arithmetic processing by
the CPU 53. It is.
[0013]
Hereinafter, the operation of the present invention will be specifically described in order. (1)
First, when the output selection switch 6 is set to “A”, the input selection switch 11 and the
instruction of the microcomputer 5 are The speaker switching switch 14 is connected to the a
side, and the input audio signal is amplified by the speaker power amplifier 12 to be a required
audio output (however, the audio output when the headphone 4 is connected to the headphone
jack 61 at this time) , This headphone 4 takes precedence).
[0014]
(2) Next, when the output selection switch 6 is set to "B", the input selection switch 11 is
connected to the b side and the speaker selection switch 14 is connected to the a side according
to the instruction of the microcomputer 5 At the same time, the input audio signal is amplified by
the speaker power amplifier 12 or the headphone power amplifier 13 so as to produce the
required audio output.
[0015]
(3) Next, when the output selection switch 6 is set to "C", the input selector switch 11 is
connected to the a side and the speaker selector switch 14 is connected to the b side according
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to the instruction of the microcomputer 5 At the same time, the input audio signal is amplified by
the speaker power amplifier 12 so as to be a necessary audio output (however, at this time, the
headphone 4 gives priority to the audio output when the headphone 4 is connected to the
headphone jack 61).
[0016]
(4) Next, when the output selection switch 6 is set to "D", the input selection switch 11 is
connected to the b side and the speaker selection switch 14 is connected to the b side according
to the instruction of the microcomputer 5 At the same time, the input audio signal is amplified by
the speaker power amplifier 12 or the headphone power amplifier 13 so as to produce the
required audio output.
[0017]
(5) Next, when the output selection switch 6 is set to "E", the input selector switch 11 and the
speaker selector switch 14 are connected to the side a according to the instruction of the
microcomputer 5, and the input audio signal is a speaker The power amplifier 12 amplifies the
signal so as to obtain a necessary sound output (however, even if the headphone 4 is connected
to the headphone jack 61 at this time, the internal speaker 2 gives priority to the sound output).
[0018]
In the present invention, the setting conditions for switching are set to five stages, but from the
gist of the present invention, the object of the present invention can be achieved if the number of
outputs of the conventional example is exceeded. The number of setting conditions does not
matter.
[0019]
Since the present invention is configured as described above, the following effects can be
obtained.
[0020]
Since an amplifier, a CPU, etc. already incorporated in a wireless communication device etc. can
be used as it is, the circuit configuration can be simplified.
[0021]
Further, by connecting an internal speaker and an external speaker having different audibility
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characteristics, switching of the audio output according to the type of the received signal is
possible, and therefore, it is possible to use a speaker according to the reception condition.
[0022]
Furthermore, since voice output can be performed simultaneously with the internal speaker or
the external speaker and the headphones, for example, as in the case of public operation, the
operator such as a wireless communication device in a location with a lot of ambient noise uses
headphones. Under recommended conditions, and in the case where there is a listener other than
the operator, the operator can use headphones and the listener can hear the communication
contents through the internal speaker or the external speaker, Each can obtain an ideal reception
environment.
[0023]
Also, by providing an output selection switch on the headphone jack, combined with the use of
headphones, the space of the entire device can be effectively utilized.
[0024]
Brief description of the drawings
[0025]
1 is a block diagram showing an embodiment of the present invention.
[0026]
2 is a flowchart of a control program executed by the microcomputer according to the present
invention.
[0027]
3 is a block diagram showing a conventional embodiment.
[0028]
Explanation of sign
[0029]
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Reference Signs List 1 switching / amplification unit 2 internal speaker 3 external speaker
connection terminal 4 headphone connection terminal 5 microcomputer 6 output selection
switch 11 input selection switch 12 speaker power amplifier 13 headphone power amplifier 14
speaker selection switch 61 headphone jack
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