Electrical audio signal processing systems and devices – Binaural and stereophonic
Patent
1996-08-05
1997-12-23
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
381 94, 381 92, H04S 100, H04B 1500, H04R 300
Patent
active
057013446
ABSTRACT:
An audio processing apparatus is arranged to be capable of attenuating only an unnecessary wind noise without cutting off the low frequency part of sounds picked up. In the apparatus, a first low frequency band signal and a first high frequency band signal are extracted from a signal obtained by subtracting a delayed right-side audio signal from a received left-side audio signal. A second low frequency band signal and a second high frequency band signal are extracted from a signal obtained by subtracting a delayed left-side audio signal from a received right-side audio signal. An addition signal is formed by adding together the extracted first low frequency band signal and the extracted second low frequency band signal. The extracted first low frequency band signal and the addition signal are added together in an arbitrary variable addition ratio to obtain a first variable addition signal. The extracted second low frequency band signal and the addition signal are also added together in an arbitrary variable addition ratio to obtain a second variable addition signal. The extracted first high frequency band signal is outputted with the first variable addition signal added thereto, while the extracted second high frequency band signal is outputted with the second variable addition signal added thereto.
REFERENCES:
patent: 4192969 (1980-03-01), Iwahara
patent: 4308423 (1981-12-01), Cohen
patent: 4980914 (1990-12-01), Konugi et al.
Canon Kabushiki Kaisha
Isen Forester W.
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