Electrical audio signal processing systems and devices – Binaural and stereophonic – Pseudo stereophonic
Patent
1997-03-21
1999-12-21
Lee, Ping
Electrical audio signal processing systems and devices
Binaural and stereophonic
Pseudo stereophonic
381119, H04R 500
Patent
active
060059486
ABSTRACT:
A multi-channel input signal is downmixed to a multi-channel output signal by one of four downmixing routines. The downmixing routines compute the output channels by multiplying each of a number of coefficients by one of the input channels, and then accumulating the resulting products to form the output channels. For efficiency, the four downmixing routines perform various different computations on the input channels using different combinations of coefficients. For a given combination of input and output channels, a downmixing routine is chosen that will perform all of the necessary computations for downmixing the input to the output, while minimizing the number of computations performed with zero-valued coefficients. As a result, computational efficiency is increased by avoiding unnecessary computations, while at the same time, programming effort and program size are maintained at reasonable levels.
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patent: 5524054 (1996-06-01), Spille
patent: 5594800 (1997-01-01), Gerzon
patent: 5680464 (1997-10-01), Iwamatsu
Todd et al., AC-3: Flexible Perceptual Coding for Audio Transmission and Storage, Dolby Technical Papers, Publication No. S94/10152, 1994.
Advanced Television Systems Committee Doc. A/52, Digital Audio Compression Standard (AC-3), ATSC, Dec. 20, 1995.
Lee Ping
Sony Corporation
Sony Electronics Inc.
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