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DESCRIPTION JPS5768989

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DESCRIPTION JPS5768989
Description 11 Title of Invention
Reverberation microphone
3. Detailed Description of the Invention The present invention relates to the improvement of a
reverberator-equipped microphone. FIG. 1 shows a conventional reverberator-equipped
microphone. In the same figure (1), 1 is a dynamic microphone unit, 12 is its diaphragm, 13
14.15 d, it is a foam elastic body provided in the case 16 ° 12, 18 is a mover, 11 and 20 are
Recesses and coil shields that constitute the reverberation amount fli1 provided in the case 21
respectively, through holes provided in the diaphragm 19 and the vibration @ 12 fd case 16.17,
the elastic body 14, and the mover 18 The valve is connected acoustically. In such a
configuration, the bubble density of the elastic body is changed by moving the movable element
18 in the direction of all the arrows A and B in the figure, so that the diaphragms 12 ° 19 are
acoustically opened and shut off to adjust the reverberation amount. Ru. On the other hand, in
FIG. 7B, reference numeral 23 denotes a microphone unit made of, for example, an electret for
contact sound provided in a case 24 having a plurality of through holes, and a reverberation
provided in each case 28 in 25.26.27. A diaphragm and a coil spring are provided, and a
microphone unit 29 is provided in the case 28 and is a microphone unit made of electret, for
example, for reverberation. The output blade signals of the microphone units 291 and 23 are
supplied to the mixing circuit 30, and a reverberation sound @ festival is performed. EndPage: In
the case of the microphone shown in FIG. 1 (a), the sound sensitivity is not a problem, but the
sound pressure in the low frequency range (150 Hz to 1.5 kHz) of the diaphragm 20 is very
small and reverberation occurs. It has the drawback of being difficult. Generally, an isocurve
circuit of a vibrating thread consisting of a diaphragm and a coil spring is lowered as shown in
FIG. 2- (a). Where T is a diaphragm, F is an input sound pressure, and Z is a radiation reactance
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or the like. The amplitude characteristics when such a diaphragm (also called a spring) V and a
constant sound pressure are applied are as shown in FIG. 2 (b). The sound pressure characteristic
of the front surface of the diaphragm is as shown in FIG. 2 (C). In this case, f of the vibration
system. Is usually 2 kHz to 8 kHz. Considering that this is replaced with all the microphones, if
the sound pressure is totally applied from outside to the front of the diaphragm and the
microphone unit 7 'is installed from the outside, the sound pressure in the low range generated
from the moving plate is very small. I can say that. In other words, the reverberation in the sound
band is very low. Also, in the case of FIG. 6 (b), the reverberation sound can be obtained
sufficiently. The reverberation sound obtained by the microphone unit 29 (7) The direct sound
obtained by the mito microphone unit 23 is synthesized and the sound quality is not good. It has
the disadvantage of
This invention 1 is made based on the above-mentioned circumstances, provides an empty room
in the front of an imaging board which generates a reverberation, provides a through hole
communicating with the outside in this empty room, and provides a microphone unit in the
empty room Therefore, it is an object of the present invention to provide a reverberant
microphone which can raise the sound pressure level in the low range and improve the sound
quality. Hereinafter, an embodiment of the present invention will be described with reference to
the drawings in FIG. 3. In FIG. 3, 31 is a bottomed cylindrical first case, and an opening of this
case 31 is a diaphragm. 2 is provided. An elastic member, for example, a coil spring 33 is
provided between the bottom portion and the moving plate 32 inside the housing 31. At the front
of the diaphragm 32 of the housing 31 is provided a second housing 35 which forms a vacant
space 34. A through hole 36 as a sound path is provided in a portion of the housing 35 facing
the diaphragm 32. Further, in the inside of the housing 35, for example, an electret in which a
FET (field effect transistor) is incorporated, and a microphone unit 37 are provided. Reference
numeral 38 denotes a power supply and an output circuit. An equivalent circuit of the
microphone according to the above configuration is as shown in FIG. 4 (a). It is a cavity of the
space 34 by the C housing 35. The same parts as in FIG. 2 (,) are given the same reference
numerals. As described above, by providing the air chamber 34 on the front surface of the
imaging plate 32, the sound wave entering from the through hole 36 is transmitted to the
microphone unit 37. 11, the diaphragm 32 is driven. The sound wave generated by the
diaphragm 32 enters the microphone unit 37 as a reverberation component, and further drives
the diaphragm 32. Therefore, the low-pass characteristic is improved as shown by fl in FIG. 4 (b)
by providing the space 34, and the whole sound pressure has the effect of rising as compared
with the conventional case indicated by f2. Also, by providing the vacant room 34, the
reverberation time can be increased. According to the experiment, when the volume of the cavity
34 is 1 occ degree, the diameter of the through hole 36 is suitably changed by about 2 vm. If it is
larger than this, the frequency at which the residual stems will be high and the reverberation
time will be short, and if it is small, the residual time will be long, but the high frequency will be
lowered. In addition, when the cavity on the rear surface of the diaphragm 32 is sealed, a volume
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(20 CC or more) that does not significantly increase the stiffness of the diaphragm 32 is
necessary, but small holes are provided to release the back pressure. The orientation of the
microphone unit 37 does not necessarily have to face the diaphragm 32.
As described above, according to the present invention, it is possible to provide a microphone
with a reverberation device that raises the sound pressure level in the low frequency range and
improves the sound quality. 4, a brief description of the surface Fig. 1 (,) (b) is a side sectional
view showing different conventional residual 4 device 'N microphone with different, Fig. 2 (, fb)
EndPage: 2 (c) is each This figure is shown to explain the conventional vibration system, and the
figure (a) an equivalent circuit diagram of the ld vibration system, the figure (b) a plate width
characteristic figure, the figure (c) a sound pressure characteristic figure, 3 is a side sectional
view showing an embodiment of the third microphone with echo device according to the present
invention, FIG. 4 (,) is an equivalent circuit diagram of the vibration system shown in FIG. 3, and
FIG. 3 (b) is FIG. It is a sound pressure characteristic view of the device shown in FIG. 32:
diaphragm, 33: coil spring, 34: empty space, 36: through hole, 37: microphone unit. Applicant
Agent Attorney Suzue Takehiko Yutaka-EndPage: 3
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