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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional acoustic
device, FIG. 2 is a cross-sectional front view of a microphone used for the acoustic device in one
embodiment of the present invention, and FIG. FIG. 4, FIG. 5, and FIG. 6 are each a cross-sectional
view of the same apparatus embodiment. 4 и и и и и и Housing, 8, 9, и и и и и и и и и и и и и и и 10, 11 и и и и и
blind hole, 15 и и и и и и и и и и и и и и и и и и и и Speaker Baffle plate, 14 ииииии Microphone.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio
apparatus such as an interphone and a loudspeaker in which a speaker and a microphone are
mounted in the same case, and in which the occurrence of urling is to be prevented. It is. An
example of a conventional acoustic device is shown in FIG. 1 by taking an intercom as an
example b '4-73. In FIG. 1, 1 is a microphone, 2 is a speaker, and 3 is a housing. In this
apparatus, when the output of the speaker 2 is increased, so-called howling development occurs
in which the output enters the microphone 1 and the sound comes out of the loud speaker 2.
Because of this howling development, the output of the speaker 2 can not be increased at all.
Therefore, the present invention intends to provide an acoustic apparatus in which such howling
development does not occur, and an embodiment of the present invention will be described
below with reference to the drawings. As shown in FIG. 2, a substrate 5 is provided in the inoter
phone housing 4 and a single-field effect transistor 6 for impedance conversion is attached to the
substrate 5. A frame 7 is provided in a housing 4, and curved vibrating membranes 8 and 9 are
stretched on the frame 7. The vibrating films 8 and 9 have a polymeric piezoelectric film. The
sound hole 10 is opposed to the vibrating membrane 9 facing the vibrating membrane 8 and the
sound hole 10 facing the vibrating membrane 9 ?), and the sound hole 11 is independently
formed on the wall surface of the housing 4 with the sound hole 1o. ,! 1. h-I ', 13 12 is a sound
absorbing material, and 13 is a gloss rim. When sound pressure of positive or same phase of
valve is added to sound hole, The outputs of diaphragms 8, 9 are calculated within
housing 4 and sound pressure of opposite phase is added to sound hole 10.11. The outputs of
the vibrating membranes 8 and 9 are subtracted in the housing 4. The microphone thus
configured is attached to the baffle plate. FIG. 3 shows the attachment form. The microphone 14
and the speaker 5 are attached to the same infinite baffle plate 16, and two sets of sound holes 6
and 7 of the microphone 14 are opened on the front and back of the baffle plate 16 respectively.
In this device, the sound pressure generated from the speaker 5 is in the opposite phase in the
case J of the baffle plate 16 and, as described in the above description, the output is not taken
out from the microphone 14-1. The external sound pressure coming from the edge of the front of
the plate is taken out as an output because it is applied to only one vibrating membrane. As
described above, the device of the present invention has four sensitivities to the sound of the
speaker, has sensitivity only to extraneous sound, and is extremely strong against howling.
The device of the present invention is extremely resistant to vibration due to the vibration of the
casing. That is, when the microphones integrally vibrate due to the vibration of the housing 4, the
diaphragm 8.9 operates in the same manner as when sound for the opposite phase is added to
each sound hole, and the signal of the two diaphragms 8, 9 They cancel the bows and do not
come out as high strength. Since interphones and loudspeakers are often used outdoors,
microphones are required to be water resistant. It is required to be structurally simple because
two peristaltic membranes are used. In order to satisfy these requirements, a polymeric
piezoelectric film may be used as the peristaltic film 8.9. The "-J-" embodiment of the hlllp device
of the present invention is shown in FIGS. 4, 5 and 6. FIG. In these embodiments, by mounting
the speaker in the housing, the sound pressure increase inside the housing due to the installation
of the speaker can be prevented, or the sensitivity of the two diaphragms can be made different.
In order to reduce the sensitivity effectively, Fig. 4 shows an example in which many holes 18 are
opened in the case 17 so that the inside of the case 17 and the outside one are equal. For
example, FIG. 5 shows that the output of the two diaphragms 8 and 9 is used even if the internal
use for sound rises as the diaphragms 8 and 9 use different 2-second films with different values
of the piezoelectric coefficient. Were made equal. That is, as the vibrating film 9 on the inner side
of the housing 17, an imaging film with low piezoelectricity and low sensitivity is used. The
embodiment shown in FIG. 6 has a structure in which the sound pressure inside the housing is
reduced by the sound absorbing material 19. The following seven examples are good when the
sound device of the present invention is used for speech to the king and the effect is given at a
frequency of about 30 ?-3 KHz or so 3b, and the comparison fishing part is good and simply T #
It is. As described above, according to the acoustic device of the present invention, since the
microphone having the two diaphragms is used, howling can be effectively removed.
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