Microphone apparatus
First Claim
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1. A microphone apparatus comprising:
- a first non-directional microphone;
a second non-directional microphone disposed at a distance to the first non-directional microphone so that main axes of the first and second non-directional microphones are aligned on a straight line;
a delay unit for delaying an output signal of the second non-directional microphone;
a high-pass filter for removing low frequency components of an output signal of the first non-directional microphone; and
a subtracter for subtracting an output signal of the delay unit from an output signal of the high-pass filter.
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Abstract
A microphone apparatus using two microphones has a circuit for processing output signals of the two microphones so as to obtain non-directional characteristics in a low frequency region and uni-directional characteristics in a high frequency region. When this microphone apparatus is incorporated in an appliance containing an acoustic noise source and vibration source therein, acoustic noise, vibration noise and wind noise are reduced to prevent a reduction of the S/N ratio when picking up the sound, so that the recording of an excellent quality sound can be realized.
43 Citations
1 Claim
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1. A microphone apparatus comprising:
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a first non-directional microphone; a second non-directional microphone disposed at a distance to the first non-directional microphone so that main axes of the first and second non-directional microphones are aligned on a straight line; a delay unit for delaying an output signal of the second non-directional microphone; a high-pass filter for removing low frequency components of an output signal of the first non-directional microphone; and a subtracter for subtracting an output signal of the delay unit from an output signal of the high-pass filter.
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsKobayashi, Hiroshi, Naono, Hiroyuki, Yamashina, Yuuji, Matsumoto, Michio, Ono, Kiminori
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Primary Examiner(s)Ng, Jin F.
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Assistant Examiner(s)Lefkowitz, Edward
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Application NumberUS07/612,145Time in Patent Office847 DaysField of Search381/71, 381/92, 381/94, 381/26, 367/123, 367/126, 367/121US Class Current381/92CPC Class CodesH04R 2410/01 Noise reduction using micro...H04R 2410/07 Mechanical or electrical re...H04R 3/005 for combining the signals o...
