Method and apparatus for downmixing decoded data streams in the

Details Method and apparatus for downmixing decoded data streams in the Method and apparatus for downmixing decoded data streams in the

1997-05-02

1999-08-31

Chin, Stephen

Pulse or digital communications

Pulse code modulation

375241, 341 50, 341 55, 381 77, 381 80, 704500, 704501, H04B 1404, H04B 166, H04B 300

Patent

active

059463520

ABSTRACT:
A data processing device is programmed to decode and transform a stream of data representing a plurality of subband encoded channels of audio data into one or more channels of PCM encoded data for reproduction by a speaker subsystem. An improved method for decoding and transforming utilizes downmix matrices (1021 and 1022) to form downmixed frequency domain channels in buffers (1031-1034). Only two long DCT transform operations (1041 and 1042) and two short DCT transform operations (1043 and 1044) are needed to transform the downmixed frequency domain channels into a left PCM output (1071) and a right PCM output (1072).

REFERENCES:
patent: 5488665 (1996-01-01), Johnston et al.
patent: 5636186 (1997-06-01), Yamamoto et al.
patent: 5644310 (1997-07-01), Laczko, Sr. et al.
patent: 5657423 (1997-08-01), Benbassat et al.
patent: 5729556 (1998-03-01), Benbassat et al.
patent: 5748835 (1998-05-01), Lee
patent: 5867819 (1999-02-01), Fukuchi et al.
Bergher et al., Dolby AC-3 and MPEG-2 Audio Decoder IC with 6-Channels Output, IEEE Transactions on Consumer Electronics, pp. 567-574, Aug. 1997.
Okabe et al., Full Audio Software Solution For a 16-Bit DSP Core For Digital Audio Decoder LSI, IEEE Transactions on Consumer Electronics, pp. 117-124, Feb. 1998.
MPEG-1, 3-11172.
MPEG-2, Information Technology--Generic Coding of Moving Pictures and Audio : Audio ISO/IEC 13818-3, 2.sup.nd .
Digital Audio Compression Standard (AC-3), Dec. 20, 1995, Advanced Television Systems Committee, ATSC Standard.
TI-17424A (S.N. 08/475,251), allowed, Integrated Audio Decoder System and Method of Operation.
TI-17600 (S.N. 08/054,127), allowed, System Decoder Circuit With Temporary Bit Storage and Method of Operation.

Affiliated with

Also associated with

Rating

Method and apparatus for downmixing decoded data streams in the does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for downmixing decoded data streams in the , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for downmixing decoded data streams in the will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2428141