Digital surround sound processor

Details Digital surround sound processor Digital surround sound processor

1995-11-22

1997-06-24

Kuntz, Curtis

Electrical audio signal processing systems and devices

Binaural and stereophonic

Quadrasonic

381 19, H04R 500

Patent

active

056424230

ABSTRACT:
A digital surround sound decoder. The decoder uses an architecture including two signal processing chips to achieve a program that can decode audio data at sufficiently high resolution. The decoder performs in real time and is compatible with standard surround sound formats. The decoder includes software that utilizes table lookups for critical functions in the decoding process. The processing flow of the decoder's program takes advantage of the multi-function capability within the specific processors used in the design while using a minimum number of program instructions. The program implements band pass filtering, sum-difference calculations, fast-attack slow-decay integration, summation and reciprocal processing, determination of fast and slow modes, look-up table indexing, adaptive matrix processing and various other functions to generate decoded surround sound signals from encoded left and right signal inputs.

REFERENCES:
patent: 3864516 (1975-02-01), Kameoka et al.
patent: 3944735 (1976-03-01), Willcocks
patent: 3970788 (1976-07-01), Cooper
patent: 4862502 (1989-08-01), Griesinger
patent: 5046098 (1991-09-01), Mandell et al.
patent: 5216718 (1993-06-01), Fukuda
patent: 5524054 (1996-06-01), Spille

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