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JPS56125693

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Notice
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DESCRIPTION JPS56125693
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of
a vibration noise canceling microphone according to the present invention, FIG. 2 is a diagram
showing an example of a signal processing circuit, and FIG. It is a characteristic view showing a
noise level. Explanation of symbols of main parts, 1 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и vibration pickup, 4 и и и и и signal processing circuit, 5 и и и ......... Impedance conversion
circuit, 7 ... ... Characteristic compensation circuit.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone
capable of canceling vibration noise. There are microphones of various structures that are
transducers that convert air vibration into current, but in the case of microphones of any
structure, vibration noise transmitted to the microphone unit through the t-body of the
microphone is used. It was easy to shut off, and it was easy to use. For example, when using a
dynamic microphone unit using a magnet, it is possible to suppress imaging noise through the
housing to some extent by arranging a vibration absorbing material such as rubber between the
microphone unit and the housing. Although it is possible, in the case of a microphone using a
lightweight microphone unit of an electreto-contrast type or the like, it is not possible to absorb
vibration by a member such as a comb because the resonance frequency rises. There is a method
of canceling vibration noise transmitted through the housing by combining two diaphragms of
the microphone unit, and combining signal currents from the respective diaphragms. However,
such a method is not effective except when using an omnidirectional microphone unit, and can
not be implemented with a primary sound pressure gradient microphone or the like which is an
ordinary single-directed hospital microphone. The present invention ameliorates the abovementioned disadvantages of the conventional microphones, and it is possible to output the
vibration noise transmitted from the case to the microphone unit even when using a
unidirectional and lightweight microphone unit. It is an object of the present invention to provide
a vibration noise canceling microphone that can be prevented. The vibration noise canceling
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microphone according to the present invention is provided with an imaging pickup having a
vibration direction parallel to the direction of the main axis of the microphone unit inside the
housing of the microphone, and the output signals of the vibration pickup and the microphone
unit It is characterized in that it is configured to cancel vibration noise. Hereinafter, embodiments
of the present invention will be described in detail with reference to the drawings. FIG. 1 is a
perspective view showing an example of a microphone configured in accordance with the present
invention. The microphone shown in FIG. 1 has an electreto-contrast-type microphone unit 1, and
this microphone unit 1 is fixed to one end of a cylindrical holder 2 made of metal or the like. At
the other end of the holder 2, a vibration pickup 3 using a polymeric piezoelectric material or the
like is provided.
Further, at the central portion of the holder 2, a signal processing circuit 4 is provided which
combines output signals of the microphone unit 1 and the vibration pickup 2. As described
above, since the microphone unit 1 and the vibration pickup 3 are fixed in common to the holter
2, it is possible to obtain substantially the same output signal with respect to external vibration.
Since the vibration direction of the CANOP 3, that is, the direction perpendicular to the main
surface of the piezoelectric body coincides with the direction of the main axis of the electreto
condenser type non-microphone uninot 1, the vibration pickup 3 is from the outside of the
microphone unit 1. The vibration of the holder 2 is detected in the direction V which is sensitive
to the vibration. The second and third vibration hinokanops 3 detect only the acceleration of the
vibration of the holder 2 and the sensitivity to the original sound vibration to be detected by the
microphone is low. It is arranged so as not to The microphone shown in FIG. 1 is further housed
in a predetermined case together with a battery of the signal processing circuit 4 and the like,
and a wind screen etc. is provided to detect the sound pressure reaching the microphone unit 1.
Although it is possible to configure a microphone or the like, it is also possible to use the holder
2 as the housing itself or to connect the battery case to the holder 2 to configure the housing.
Next, FIG. 2 shows an example of the configuration of the signal processing circuit. In this figure,
the output signals of the microphone unit 1 and the vibration pickup 3 are manually input to the
impedance conversion circuits 5 and 6 using FETs, respectively, and the output signal of the
impedance conversion circuit 6 connected to the vibration pickup 3 is The characteristic
compensation circuit 7 is inputted. The outputs of the characteristic compensation circuit 7 and
the impedance conversion circuit 5 are commonly connected to become the output of the
microphone. ! In this case, the output of the microphone unit 1 is connected by connecting the
vibration pickup 3 to the innoance conversion circuit 6 or inverting the phase by the
characteristic compensation circuit 7 so that the phase is opposite to the output signal of the
microphone unit l. Among the signals, components equal to the output signal of the vibration
pickup 3 are canceled out, so that it is possible to cancel the vibration noise transmitted through
the outside, ie, the housing, and obtain an output signal having a high S / N ratio. In order to
cancel such vibration noise, the signal level and frequency characteristics of the microphone unit
1 and the vibration pickup 3 should be equal or preferably the sensitivity characteristics of the
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microphone unit 1 and the vibration pickup should be set to appropriate values. Setting and
special features!
It is effective to compensate the frequency characteristic by the compensation circuit 7. Fig. 3
shows l-! The vibration noise level of the microphone of the present invention obtained as a
result of canceling vibration noise as in the ILO, and the vibration of the conventional
microphone! 1 is a characteristic diagram comparing l-l'lY'lF responses, and as illustrated by a
broken line, the microphone according to the present invention has a gain lower than that of the
conventional microphone indicated by a solid line, especially in the mid-low range It is
understood that the vibration noise level is reduced. The microphone according to the present
invention is characterized in that the noise level due to the external vibration is very low as
shown in -F, and in particular, the hunt microphone used on hand, the microphone built in
equipment such as a tape recorder, and the hearing aid These microphones are excellent in
performance as microphones used by fixing them to the sea urchin body. In the above
embodiment, although an example using a microphone unit, ie, a sound pressure type electret
condenser type microphone, has been shown, the invention is not limited thereto, and various
microphone units such as a speed type dynamic type microphone unit may be used. It is clear
that you can. Further, the signal processing circuit portion can be provided outside the
microphone, and a method of connecting so that the microphone unit and the vibration
pinocousof output are synthesized in the reverse phase without providing an active element is
also possible.
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