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DESCRIPTION JPS5865498

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DESCRIPTION JPS5865498
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
reverberator-equipped microphone that suppresses the occurrence of howling. Conventionally, as
a microphone with a reverberation device, one shown in FIG. 1 is known. That is, the inside of the
microphone case 1 is divided into the front and rear cavities 4.5 by the reverberation diaphragm
3 'to which the coil spring 2 is fixed, and the front cavity 4 is provided with the through hole 6
communicating with the outside. In addition, the microphone units 7.8 are housed in the front
and rear vacant spaces 4.5 respectively. The in-phase output signals from the microphone units
7.8 are mixed in the mixing circuit and input to an amplifier circuit (not shown). However, in
general, when the microphone is used in a sound field where the sound wave from the speaker is
input to the microphone at a high level, the speaker and the microphone are acoustically coupled
to be connected to the high frequency microphone, the amplifier circuit and the amplifier circuit.
A closed loop is formed between the loudspeakers, which causes the housing to be very
unpleasant. The same applies to the microphone with a reverberation device shown in FIG. 1
described above, and when the microbon unit 7.8 is acoustically coupled to a speaker (not
shown), howling tends to occur, and in particular, the microphone with a reverberation device is
Since two Bonn units 7.8 are provided and the reverberation diaphragm 3 is also provided, there
is a problem that howling tends to occur. In addition, in order to suppress howling between the
microphone and the speaker, a proposal is also made to reduce the microphone sensitivity to the
direct sound from the speaker to near zero by using the gain difference between the two
microphones placed symmetrically with respect to the speaker. It is done. However, this
technology is still a theoretical proposal and is under investigation as to how to specifically
arrange the microphones, and when applied to a microphone with a reverberator, two
microphones are used as speakers. On the other hand, it is difficult to place it in the target
because of geometric limitations, and its practical implementation is difficult. The present
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invention has been made to solve the above-mentioned drawbacks, and microphone units whose
output signals are in opposite phase to each other are stored in the front and back spaces divided
by the reverberation plate fixed to the elastic material in the microphone case. It is an object of
the present invention to provide a microphone with a reverberation device in which the
occurrence of howling is suppressed, which is characterized by providing a mixed signal of the
output signals of both microphone units while providing it. Hereinafter, the present invention will
be described in detail. The same reference numerals as in the conventional example of FIG. 1
denote the same parts. FIG. 2 is a Jll'i elevation showing an embodiment of the present invention.
In the figure, the microphone case 1 has a right bottom cylindrical shape, in the middle of which
the reverberation diaphragm 3 is stretched by a known means, and the inside of the microphone
case 1 is divided into a front chamber 4 and a rear chamber 5 It is divided into At the center of
the reverberation diaphragm 3, the tip of a coil spring 2 whose one end is fixed to the bottom of
the microphone case 1 is fixed. In the microphone case 1 facing the reverberation diaphragm 3
in the front room 4 side divided by the reverberation diaphragm 3, a through hole 6 as a sound
path for introducing a sound wave from a sound source (not shown) into the cavity 4 The
microphone unit 7 is supported by the mounting hole of the microphone case 1 in the space 4. A
communication hole 9 with the outside is bored in the rear space 5 divided by the reverberation
diaphragm 3 (in the side wall of the microphone case 1, and in the space 5, it opposes the
communication hole 9. The other microphone unit 8 supported by the side wall on the side of
These microphone units 7.8 include non-directional electret-microbon units having built-in FET
transistors, for example, having uniform characteristics, and output voice conversion signals of
opposite phases that are out of phase with each other by 18 o ░. The output signal of the
microphone unit 7.8 is input to the negative phase mixing circuit 1o, and the mixed output signal
from the negative phase mixing circuit 1 ░ is input to an amplifier circuit (not shown). The
reverse phase mixing circuit 1o is a known circuit that mixes the output signals of the
microphone units 7.8, and can be accommodated outside the microphone case 1 or housed in the
microphone case 1. In the microphone with reverberation device of the present invention thus
configured, the sound wave from the sound source directly enters the front space 4 through the
through hole 6 of the microphone case to drive the microphone unit 7 provided in the space 4. ,
Vibrate the reverberation diaphragm 3 at the boundary between the vacant space 4 and 5. Since
the illumination spring 2 is fixed to the reverberation diaphragm 3, the reverberation vibration of
the reverberation diaphragm 3 is caused. The reverberation vibration is generated by the
microphone unit 7 in the front chamber 4 and the microphone unit 8 in the rear chamber 5
Drive. The communication hole 9 provided in the microphone case 1 is for driving both the
microphone units 7 and 8 with equal sound pressure. When the sound source close to the
microphone, for example, the voice of the microphone user causes the diaphragm 3 to
reverberate and vibrate the diaphragm 3, the microphone units 7 and 8 are disposed before and
after the reverberation diaphragm 3, respectively. According to the vibration of the reverberation
diaphragm 3, positive and negative sound pressure is applied.
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As a result, since the microphone units 7.8 are in a relation of outputting converted signals of
opposite phases, as shown in the output signal characteristic diagram of the microphone units
7.8 in FIG. The converted output signal (A> (B)) is in phase at the same signal level, and is mixed
in the reverse phase by the mixing circuit 10, and the output signal of the microphone unit 7.8 is
superimposed as shown in FIG. Thus, a combined signal approximately twice that of the output
signal of each microphone unit is obtained. As a method of mixing the output signals of the
microphone unit 7.8, there is a method of connecting in parallel with a method of connecting
each output signal in series, but the output impedance of the microphone unit is doubled or 1?2
In both cases, the combined output power is doubled. That is, the output of the microphone with
reverberation device of the present invention is increased. Also, in general, a sound source
distant from the reverberator microphone, for example, a sound wave from a speaker, does not
have enough energy to reverberate the reverberation diaphragm 3. Therefore, the sound
pressure from the speaker is directly applied to the microphone unit 7.8 in close in-phase, and
the microphone unit 7.8 outputs the converted signal of the same level and the opposite phase as
shown in the characteristic diagram of FIG. A) (B) is output, and the negative phase output signals
are canceled each other by the negative phase mixing circuit 10, and the output from the
negative phase mixing circuit 10 is suppressed. As a result, the howling group system constituted
by the microphone unit, the 751 circuit and the speaker is cut off, and howling is suppressed. In
the microphone with reverberator according to the present invention, the transfer difference due
to the distance between the microphone units 7.8 is considered to be a structure in a frequency
band that does not cause a problem. Furthermore, as the acoustic energy for driving the
microphone unit of the microphone with reverberation device of the present invention in the
same phase, in addition to the sound waves from the above-mentioned speakers, noise and shock
noise in the natural world far from the microphone and the microphone case are transmitted.
There is mechanical conduction noise (for example, touch noise of the microphone case), and the
converted signal of these ? noises is also output in the opposite phase from the microphone unit
7.8 as described above, so that it is suppressed by mixing them. Is possible. As described above,
according to the microphone with reverberation device of the present invention, the inside of the
microphone case is divided into the front and back spaces by the reverberation plate to which
the elastic material is fixed, and the output codes are stored in the front and rear spaces. A
microphone unit of opposite phase to each other is provided to output a mixed signal of both
microphone unit output signals, so that the mixed output of the microphone unit by the sound
wave of the speaker separated from the microphone can be reduced to almost zero. Thus, it is
possible to cut off the acoustic loop system between the microphone and the speaker and to
suppress howling.
Further, it is possible to suppress extraneous noise that does not vibrate the reverberation
diaphragm and touch noise of the microphone case, and handling of the microphone with
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reverberation becomes easy. Furthermore, for sound waves from a sound source close to the
reverberator microphone, the mixing output of the microphone unit increases approximately
twice, and the output of the reverberator microphone increases.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view showing a conventional microphone with reverberation device, FIG. 2 is
a sectional view showing one embodiment of the microphone with reverberation device of the
present invention, and FIG. 3A-C is a microphone with reverberation device shown in the second
An example of the output signal level of each microbon unit and the combined output level of
each output signal by the sound wave of the sound source close to the sound source, and FIG. 4
is the sound wave of the sound source distant from the microphone with reverberator shown in
FIG. 4 is a characteristic diagram showing an example of the output signal level of each of the
microphone units according to.
1ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
reverberation diaphragm 4.5 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Microphone unit
9 ииииииииииии communication hole 10 ииииииииииии reverse phase mixer Attorney Attorney mandatory
mountain adjuvants - horse 1 Zuba 2 Zuba 3 view (A), (C) horse 4 Figure
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