Electrical audio signal processing systems and devices – Binaural and stereophonic – Stereo sound pickup device
Patent
1994-04-11
1997-05-27
Kuntz, Curtis
Electrical audio signal processing systems and devices
Binaural and stereophonic
Stereo sound pickup device
381 92, H04R 500
Patent
active
056339356
ABSTRACT:
A stereo ultradirectional microphone apparatus for detecting a sound to produce stereo sound signals, comprises: first and second ultradirectional microphones arranged side by side with a given distance in parallel for converting a sound into first and second sound signals respectively, first and second delays for delaying an output of the first and second microphones by a delay time .tau. respectively, and first and second subtractors for subtracting for subtraction between the first sound signal and an output of the second delay and subtracting for subtraction between the second sound signal and an output of the first delay. The delay time .tau. corresponds to a difference between the timings of a sound from a sound source in a direction making a clockwise angel .theta. from the front where a dead angel should be made. The subtraction provides the dead angle. Similarly, a dead angle on the side is also made to obtain a stereo characteristic. The directivity in the frequency characteristic of microphone is equalized to cancel the sensitivity in the dead angle. A stereo apparatus for forming the dead angles with two set of two filters having respective transfer characteristics determined by measurement and an adder is also disclosed.
REFERENCES:
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Furukawa Hiroki
Ibaraki Satoru
Kanamori Takeo
Ono Kiminori
Tagawa Junichi
Chang Vivian
Kuntz Curtis
Matsushita Electric - Industrial Co., Ltd.
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