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DESCRIPTION JPH11341591

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DESCRIPTION JPH11341591
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
technology for picking up an audio signal, and more particularly to a microphone with a mixer
used for audio and audio equipment.
[0002]
2. Description of the Related Art FIG. 3 shows a conventional example of a system configuration
for collecting one or more acoustic signals using a plurality of microphones, and in this example,
four microphones are used. An example is shown. In FIG. 3, 1-1, 1-2, 1-3, 1-4 are microphones
for picking up an acoustic signal, 2-1, 2-2, 2-3, 2-4 are microphone cables, 3 Is a microphone
mixer, 4-1, 4-, 2-4, and 3-4 are volume control knobs, and 5 is an output terminal.
[0003]
In FIG. 3, the acoustic signals collected by the microphones 1-1 to 1-4 are input to the
microphone mixer 3 via the microphone cables 2-1 to 2-4. The acoustic signals input to the
microphone mixer 3 are adjusted by the volume adjustment knobs 4-1 to 4-4 respectively
corresponding to the appropriate volume so that they are added and output from the output
terminal 5.
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[0004]
The sound collection system with the plurality of microphones 1-1 to 1-4 shown in FIG. 3 is a
general system used, for example, for recording a conference performed by a plurality of people.
[0005]
However, in the conventional system, when a conference or the like is assumed, there is a
problem that a plurality of microphone cables scatter on the conference desk and it is
troublesome.
Further, in order to add a plurality of microphone signals, there is a problem that the gain is
increased particularly in a low frequency region where the wavelength is long, and the signal
output from the output terminal 5 can be heard.
[0006]
FIG. 4 is an example of a frequency amplitude characteristic to show the above problem. In this
example, there is a sound source having a flat frequency amplitude characteristic in space, and
when the sound is collected by four microphones, the frequency amplitude characteristic of the
signal observed at the output terminal 5 of FIG. 3 is shown. It can be seen from the example of
FIG. 4 that the low frequency band is lifted.
[0007]
As described above, in a system in which sounds collected using the plurality of microphones 1-1
to 1-4 are added by the conventional microphone mixer 3 and one signal is output, A large
number of microphone cables are required, causing a problem of complication. In addition, when
a plurality of microphone signals are added as they are, there is a problem that the low frequency
region with a long wavelength is lifted and the sound is stagnant.
[0008]
An object of the present invention is to provide a device capable of outputting a clear acoustic
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signal without raising the complexity of the microphone cable and raising the low frequency
region even if a plurality of microphone signals are added.
[0009]
SUMMARY OF THE INVENTION The present invention provides a microphone and an amplifier
for amplifying a microphone signal level in order to solve the complexity of the microphone cable
and the feeling of stagnation when adding a plurality of microphone signals. And a filter for
suppressing low frequency components of the microphone signal in one case.
Further, the present invention has an input terminal and an output terminal, and the electric
signal inputted from the input terminal is added to the output signal of the filter of the present
invention and outputted from the output terminal. Therefore, simply by connecting the
microphones with mixer according to the present invention in series, it is possible to easily
obtain a signal obtained by adding a plurality of microphone signals.
[0010]
The filter for suppressing low frequency components according to the present invention is
characterized in that the amount of suppression is variable.
[0011]
Furthermore, it is characterized by having a power supply input terminal and a power supply
output terminal, and as a result, power supply lines can be connected in series.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described with reference to FIG.
In FIG. 1, 10 is a microphone with a mixer according to the present invention, 11 is a
microphone, 12 is a volume for amplifying a microphone, 13 is a high pass filter for suppressing
low frequency components, 14 is an input terminal, 15 is an adder, 16 Is an output terminal, 17
is a power output terminal, and 18 is a power input terminal.
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[0013]
Next, the operation will be described.
First, an acoustic signal collected by the microphone 11 is adjusted to an appropriate volume by
the volume 12. Next, the low frequency component of the microphone output signal is
suppressed by the high pass filter 13. This signal is added to the signal input to the input
terminal 14 and output from the output terminal 16. At this time, power to these electric
components is supplied by the power from the power input terminal 18.
[0014]
Next, an embodiment in which a plurality of mixer-equipped microphones 10 according to the
present invention are used will be described with reference to FIG. In FIG. 2, the same
components as those in FIG. 1 are denoted by the same reference numerals. Reference numeral
19 denotes an input terminal of an electric device such as a recorder, and reference numeral 20
denotes a power adapter. 21 is a signal cable and 22 is a power cable. Although FIG. 2 shows an
example in which three microphones with mixers 10 are connected, -1, -2, -3 are added to the
respective codes in order to distinguish the microphones with mixers.
[0015]
In FIG. 2, the signal collected by the microphone 10-1 with a mixer is output from the output
terminal 16-1, and input to the input terminal 14-2 of the microphone 10-2 with a mixer via the
signal cable 21-1. Ru. In the microphone with mixer 10-2, after the signal collected by the
microphone 11-2 passes through the volume 12-2 and passes through the high pass filter 13-2,
it is input to the input terminal 14-2 by the adder 15-2. The resultant signal is added to the
signal from the mixer-equipped microphone 10-1 and output from the output terminal 16-2. The
signal output from the output terminal 16-2 is input to the input terminal 14-3 of the
microphone with mixer 10-3 via the signal cable 21-2 and, similar to the case of the microphone
with mixer 10-2, a high pass filter The output signal from 13-3 is added by the adder 15-3 and
output from the output terminal 16-3. The output from the output terminal 16-3 is connected to
the input terminal 19 of an electric device such as a recorder. On the other hand, the power from
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the power adapter 20 is connected to the power input terminal 18-3, and the power output
terminal 17-3 is connected to the power input terminal 18-2 through the power cable 22-2.
Power is supplied to the Each of the high pass filters 13-1 to 13-3 operates to suppress low
frequency components, but as the number of connected microphones is increased, the low
frequency components are lifted, so the number of connected high frequency The amount of
suppression can be varied.
[0016]
According to the present invention, a microphone with a mixer according to the present
invention comprises a microphone for picking up an acoustic signal, a variable amplifier for
amplifying the acoustic signal picked up by the microphone, and a low level of the amplified
acoustic signal. Since a filter for suppressing frequency components, an adding unit for adding an
electric signal input from an input terminal and an output signal of the filter, and an output
terminal for outputting the added signal, one conventional microphone can be used. The
microphone cables that were necessary can be treated as if a plurality of microphones are
connected to one microphone cable, and the complexity can be reduced. Also, by connecting the
power cables in series, they can be handled like one. Furthermore, by combining the power cable
and the signal cable into one, the complexity can be further reduced.
[0017]
Further, in the present invention, by providing a filter capable of varying the amount of
suppression for suppressing the low frequency component of the microphone signal, it is
possible to reduce the lift of the low frequency component generated when adding a plurality of
microphone signals. Clear acoustic signal output can be obtained. Furthermore, since the lifting
of the low frequency component differs depending on the number of connected microphones, the
amount of suppression can be varied correspondingly.
[0018]
Further, since the power supply input terminal and the power supply output terminal are
provided, power can be supplied to the microphone with the mixer other than the power supply
of its own, and the handling becomes simple.
[0019]
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As described above, by using the microphone with a mixer of the present invention, the
complexity of the cable is reduced, and a clear acoustic signal can be obtained.
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