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[Industrial field of application] When using a mobile phone in a car, it is dangerous to take a
phone call with one hand while driving, so to talk without a phone, use a speaker separately from
the phone. It is necessary to set up and release the voice of the other party. Also for voice input,
it is necessary to install a microphone separately from the telephone. In that case, a howling
phenomenon (echo phenomenon) occurs in which the sound emitted from the speaker is again
input to the microphone and is output from the speaker. The present invention is intended to
alleviate this and make it easier to talk during driving.
2. Description of the Related Art As shown in FIG. 2, after the speaker case is attached to a
dashboard or the like or fixed by bolts, the direction of the speaker can not be changed.
Therefore, in the positional relationship with the microphone, the direction of the speaker can
not be changed to an angle at which the sound of the speaker can not easily enter the
microphone. On the other hand, when the microphone case as shown in FIG. 3 is mounted on a
sun visor or dashboard, the distance and the positional relationship from the mouth to the
microphone differ depending on the driver, and there are many cases where the driver leaves the
optimal position. In such a case, it is necessary to use a high sensitivity microphone, but on the
other hand, there is a problem that the microphone can easily spread the sound emitted from the
speaker due to the increase in the sensitivity of the microphone. In addition, when using a
unidirectional microphone, in the case of a microphone case where an air gap that leads to the
outside is provided only in the conventional voice input unit, the voice is trapped in the
microphone case and echoes, which makes the caller feel uncomfortable. give.
SUMMARY OF THE INVENTION As shown in FIG. 6 and FIG. 7, the present invention has a
structure in which the orientation of the speaker can be freely changed. Further, as shown in FIG.
4, the flexible tube is extended from the support attached to the sun visor, and the microphone
case is attached to the tip end thereof, and the unidirectional microphone is built in it. Make a
gap in the back of the microphone case that leads to the outside so that sound does not stick to
the microphone case. A resistor is inserted in series at the output of the microphone as shown in
Attach the speaker to the speaker case. The front case and the rear case are fixed and integrated.
As shown in FIG. 6, the rear case is provided with a columnar protrusion having a hemispherical
concave surface and provided with a bolt hole at the center. Also, the base has a flat surface for
fixing to the other side, and has a convex spherical surface, and the opposite side produces a
spherical void. The rear case and the spherical portion of the base are put together to form a
convex hemispherical shape, and one side is inserted with a seat having a concave hemispherical
void portion, a spring is mounted and tightened with a bolt and a nut. As shown in FIG. 8, the
housing can be moved universally with respect to the spherical surface of the base to change the
direction of the front case on which the integrated speaker is mounted, thereby changing the
sound output direction. Therefore, the speaker angle is set in a direction in which the sound is
not directed to the microphone side, so that the sound output from the speaker is unlikely to
enter the microphone again.
On the other hand, the microphone side uses a unidirectional microphone so that only voice from
a certain direction can be input. For this purpose, it is always important to use the microphone at
the optimum location of the voice input by the unidirectional microphone close to the mouth
where the voice is generated. If the input position is good, it is easy to input the voice generated
from the tip of the mouth, so that low input sensitivity can be achieved. It can be said that in the
case of low input sensitivity, it is difficult for voices coming from noise and speech to enter. FIG.
4 is fixed to a sun visor and a flexible tube incorporating a lead wire at its tip is used to maintain
its optimum voice input position. By doing so, even at a low input sensitivity, conversation can be
performed without any problem, so the sound output from the speaker becomes difficult to be
input again from the microphone.
As shown in FIG. 9, an air gap communicating with the outside is provided at the back of the
microphone case so that the sound entering from the front of the microphone does not stagnate
in the microphone case. This is to discharge the vibration from the hole to the outside so that the
air vibration of the input voice does not echo to the inside of the microphone case and to be
input again, thereby making it difficult for the echo from the inside of the microphone case to
occur. is there.
A resistor is inserted in series with the output of the microphone as shown in FIG. The sensitivity
of the microphone will inevitably vary within a certain range due to its manufacture. Therefore,
the output also varies as it is, and it is difficult to control the output within a certain range.
Therefore, this proposal aims at inserting the resistance of the large and small resistance value in
series according to the variation and outputting the sound signal outputted from the microphone,
and aligning the output signal within a certain range, so the output can be easily and accurately.
It can be adjusted.
Brief description of the drawings
1 is a block diagram of the present invention.
Fig. 2 shows the specifications of the conventional type speaker side.
Fig. 3 shows the specifications of the microphone of the conventional type.
4 is an installation example of the microphone side in the present invention.
5 is a diagram in which a resistor is inserted in series to the output of the microphone.
6 is a configuration diagram of the rear case and the Cancer part.
7 is a set of a rear case and a Cancer part.
8 is an installation example of the speaker side in the present invention.
(The direction of the speaker can be changed universally.
9 is a cross-sectional view of the microphone case.
Explanation of sign
Mobile phone speaker ASSY microphone ASSY microphone case front hole rear hole flexible tube
microphone cord presser spring ▼ 10 マ イ ク microphone unit 11 11 ナ ッ ト nut 12 rear case
ケ ー ス 13 ▲ 14 椀 seat 椀 15 15 16 ビ ス screw ▲ ▲ 17 ▼ Microphone cap 18 18 マ イ ク ロ
ホ ン Unidirectional microphone 19 19 マ イ ク Microphone holder
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