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JPH0523695

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DESCRIPTION JPH0523695
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound receiving device for a small electronic device such as a portable wireless device.
[0002]
2. Description of the Related Art A sound receiving device such as a conventional portable
wireless device or a microphone provided in a portable recording device will be described with
reference to FIGS.
[0003]
In general, the microphone 1 provided in the portable radio 16 is nondirectional, and the
microphone 1 is fixedly provided inside the case 2.
[0004]
The sound received by the microphone 1 is converted into an electric signal, amplified by the
audio signal amplifier 3, and then the noise outside the audible band is cut by the voice band
filter 4, and the antenna 6 is turned by the transmitter 5. It is supposed to be sent through.
[0005]
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However, the ambient noise during use of the communication device is mostly in the living noise
and in the audible range.
For this reason, it is difficult to remove this noise by the voice band filter 4, and as a result, the
noise during a call is also converted to an electrical signal as it is and transmitted, and the signal
to noise ratio (SN ratio) It has deteriorated and has led to the deterioration of call quality.
[0006]
SUMMARY OF THE INVENTION In view of such circumstances, the present invention seeks to
obtain excellent call quality even during a call in a noisy environment.
[0007]
SUMMARY OF THE INVENTION According to the present invention, a storage case is rotatably
provided in a small electronic device case, a non-directional microphone and a directional
microphone are stored in the storage case, and the rotation of the storage case is performed. It is
characterized in that the microphone which receives the sound by the movement is selected.
[0008]
[Operation] Depending on the noise level of the call environment, it is possible to select and use
the nondirectional microphone and the directional microphone to ensure the call quality
regardless of the noise level of the call environment.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
In FIGS. 1 to 4, the same components as those shown in FIGS. 5 to 7 are denoted by the same
reference numerals and the description thereof will be omitted.
[0011]
In the case 7 of the wireless communication device, the microphone housing 8 can be freely
rotated via the rotation shaft 9
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[0012]
A nondirectional microphone 10 and a directional microphone 11 are stored in the storage body
8, and the surface of the storage body 8 communicates with the sound receiving surfaces of the
nondirectional microphone 10 and the directional microphone 11. Drill the call holes 12 and 13.
Further, on the back surface of the storage body 8 in close contact with the case 7, a
communication hole 14 communicating with the sound receiving surface on the back surface
side of the directional microphone 11 is bored.
A micro switch 15 is provided at one end of the rotating shaft 9 so that the micro switch 15 is
operated by the rotation of the rotating shaft 9
[0013]
The nondirectional microphone 10 and the directional microphone 11 are connected to the audio
signal amplifier 3 through the micro switch 15, and the nondirectional microphone 10 and the
directional microphone are moved by the rotation of the storage body 8. 11 are alternatively
connected to the micro switch 15.
[0014]
The operation will be described below.
[0015]
FIG. 2 shows a state in which there is little ambient noise and a call is being made using the
nondirectional microphone 10. In this case, the micro switch 15 comprises the nondirectional
microphone 10 and the audio signal. The amplifier 3 is connected.
[0016]
Next, when there is much noise in the surrounding area and the speech quality is poor, the
storage body 8 is raised.
[0017]
By raising the storage body 8, the micro switch 15 is activated, the directional microphone 11
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and the audio signal amplifier 3 are connected, and the directional microphone 11 receives
sound. .
[0018]
Here, when the directional microphone 11 is used, the reason for raising the storage body 8 is a
state in which the directional microphone 11 can receive sound on both sides from the call hole
13 and the call hole 14 and In order to
This has a configuration in which the directional microphone 11 cancels the noise from both the
call holes 13 and 14 and emphasizes only the call.
[0019]
Even in a noisy speech environment, the speech quality can be ensured.
[0020]
It goes without saying that the support structure of the storage body 8 or the switch for
detecting the rotation of the storage body 8 can be changed as appropriate.
[0021]
[Effect of the Invention] As described above, according to the present invention, high-quality
communication can be secured in any of a noiseless communication environment and a noisy
communication environment.
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