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JPH11239392

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH11239392
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wireless microphone, and more particularly to a user-friendly wireless microphone which can
switch between speech and vocal with a microphone body.
[0002]
2. Description of the Related Art In recent years, it is well known that user-friendly wireless
microphones are used to speak while presenting materials to the public such as conferences and
paper presentations.
[0003]
Generally, wireless microphones of this type are divided into two for speech used in lectures and
for vocals used in karaoke etc. The user prepares two types of microphones and appropriately
uses them in accordance with the respective applications. Is the current situation.
[0004]
FIG. 4 is a block diagram showing the configuration of a general wireless microphone.
The sound is converted into an electric signal, which is an electric signal, by the sound collection
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unit 1, and is supplied to the low frequency amplification circuit 2.
The audio signal amplified by the low frequency amplification circuit 2 is mixed with the tone
signal generated by the tone oscillation circuit 3 for tone squelch and then supplied to the
oscillation modulation circuit 4. The oscillation modulation circuit 4 modulates the oscillation
carrier wave with the input voice signal and tone signal and outputs it. The modulated carrier
wave is supplied to the high frequency amplification circuit 5, amplified to a predetermined
power, and then transmitted from the antenna 6. A power control circuit 7 generates a power
supply voltage of the entire wireless microphone based on the power supply 8. The talk switch is
connected to the power supply control circuit 7, and an audio signal is transmitted from the
antenna 6 by ON / OFF thereof.
[0005]
For example, as disclosed in Japanese Utility Model Laid-Open Publication No. 61-176 896, there
is also proposed a device which connects a switching device between an amplifier and a
microphone using one microphone to switch vocals and speech and appropriately output the
same. .
[0006]
A wireless microphone for speech as a conventional wireless microphone is generally used for
speech and speech, suppressing relatively low frequency components of the speech signal for
speech intelligibility. Emphasis on
[0007]
In addition, wireless microphones for vocals used for singing voices such as karaoke are used to
amplify the frequency characteristics of the audio signal without reducing it at a low frequency
component, usually 100 Hz or less, and to suppress distortion even for large audio inputs. It has
a characteristic in which the amplification degree is reduced over the entire frequency
component, and both have different characteristics.
[0008]
Therefore, as microphones having different characteristics depending on the application are
indispensable, two microphones have to be prepared for speech and vocals, which is expensive
and extremely inconvenient.
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For this reason, although it is conceivable to mechanically adjust and share the housing itself of
the microphone body, the structure becomes complicated, and not only the cost of momentum
increases, but it becomes difficult to maintain the expected performance as the microphone .
[0009]
In addition, as disclosed in Japanese Utility Model Laid-Open Publication No. 61-176896, it is
needless to say that the size of the apparatus becomes large and the cost becomes high, as well
as being inconvenient.
[0010]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention
provides a sound collecting unit for converting sound into an electric signal, and a low frequency
amplification unit for amplifying a sound signal output from the sound collecting unit. A first
circuit disposed between the sound collection unit and the low frequency amplification unit, one
terminal of which is connected via the first capacitor, and the other terminal of which is the
second capacitor and the resistor And a switching unit for switching between the second circuit
in which the first and second circuits are connected in series.
[0011]
Furthermore, the present invention provides a wireless microphone that can suppress the
fluctuation of the impedance caused when the switching unit is switched by providing the ground
resistance between the sound collecting unit and the switching unit.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an
embodiment of a wireless microphone of the present invention, and FIG. 2 is an external view of
the wireless microphone.
[0013]
According to the wireless microphone of the present invention, the configuration is basically the
same as that of the above-mentioned prior art, so the same components as in the prior art will be
described with the same reference numerals.
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[0014]
That is, the sound is converted into an electric signal, which is an electric signal, in the sound
collecting unit 1 and then supplied to the low frequency amplification circuit 2 through the
switching unit 9.
One terminal a of the switching unit 9 is connected to the low frequency amplification circuit 2
via a capacitor 10, and the other terminal is connected to the low frequency amplification circuit
2 via a resistor 12 connected in series with the capacitor 11. It is connected.
The audio signal amplified by the low frequency amplification circuit 2 is mixed with the tone
signal generated by the tone oscillation circuit 3 for tone squelch and then supplied to the
oscillation modulation circuit 4.
The oscillation modulation circuit 4 modulates the oscillation carrier wave with the input voice
signal and tone signal and outputs it.
The modulated carrier wave is supplied to the high frequency amplification circuit 5, amplified to
a predetermined power, and then transmitted from the antenna 6.
[0015]
A power control circuit 7 generates a power supply voltage of the entire wireless microphone
based on the power supply 8.
The talk switch is connected to the power supply control circuit 7, and an audio signal is
transmitted from the antenna 6 by ON / OFF thereof.
Reference numeral 13 denotes a grounded resistance (load resistance) inserted between the
sound collecting unit 1 and the switching unit 9 to suppress a change in impedance generated
when the switching unit 9 is switched.
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[0016]
For example, a slide switch is used as the switching unit 9, and a mode of being housed in the
housing 14a of the microphone main body 14 is adopted, and is exposed only when the power
supply (battery) or the like is replaced. Therefore, it does not switch easily.
[0017]
Here, as shown in the figure, by switching to one terminal a and connecting it to the first circuit,
as a microphone for speech, a relatively low component (usually around 300 Hz or less) of
frequency components of an audio signal As the characteristics of the frequency amplification
circuit 2 shown by the line S in FIG.
[0018]
In addition, by switching the switching unit 9 to the other terminal b side and connecting it to the
second circuit side, as a microphone for vocals, the occurrence of distortion can be suppressed
even for a large voice input and the low frequency characteristic can be changed. it can.
[0019]
As described above, according to the wireless microphone of the present invention, it is a matter
of course that clear speech can be obtained for speech by switching the switching unit provided
in the microphone itself. There is an effect that it is possible to simultaneously switch the
frequency characteristics and sensitivity of the microphone so as to withstand a loud voice with
little distortion for vocals.
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