Audio decoder core constants ROM optimization

Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

704270, G10L 1900

Patent

active

061086339

ABSTRACT:
A ROM for storing constants used in both the MPEG-2 and AC-3 audio decoding algorithms. These constants include (i) matrixing constants for AC-3 and MPEG audio decoding algorithms and (ii) windowing coefficients for AC-3 and MPEG audio decoding algorithms. The ROM includes (a) a first partition for storing a first set of constants which are windowing coefficients for AC-3 decoding, (b) a second partition for storing a second set of constants which are constants used for pre-IFFT and post-IFFT steps of AC-3 decoding (Blkswflag=1), (c) a third partition for storing a third set of constants which are both IDCT coefficients for MPEG decoding and IFFT coefficients for AC-3 decoding, (d) a fourth partition for storing a fourth set of constants which are constants used for pre-IFFT and post-IFFT steps of AC-3 decoding (Blkswflag=0), and (e) a fifth partition for storing a fifth set of constants which are windowing coefficients for MPEG decoding. The first and fifth partitions store 256 windowing coefficients for AC-3 decoding and 256 windowing coefficients for MPEG decoding, respectively. The second partition stores 64 sine and 64 cosine coefficients for AC-3 pre- and post-IFFT steps (Blkswflag=1). The fourth partition stores 128 sine and 128 cosine coefficients for AC-3 pre- and post-IFFT steps (Blkswflag=1). And, the third partition stores 64 unique sine constants and 64 unique cosine coefficients.

REFERENCES:
patent: 5126726 (1992-06-01), Howard et al.
patent: 5448310 (1995-09-01), Kopet et al.
patent: 5473631 (1995-12-01), Moses
patent: 5515107 (1996-05-01), Chiang et al.
patent: 5576765 (1996-11-01), Cheney et al.
patent: 5576958 (1996-11-01), Kawakatsu et al.
patent: 5594789 (1997-01-01), Seaholtz et al.
patent: 5623311 (1997-04-01), Phillips et al.
patent: 5635985 (1997-06-01), Boyce et al.
patent: 5638128 (1997-06-01), Hoogenboom et al.
Dave Bursky, "Single Chip Performs Both Audio and Video Decoding," Electronic Design, Apr. 3, 1995.
Unknown, "Coding of Moving Pictures and Associated Audio for Digital Storage Media At Up To About 1.5 MBIT/s," 3-11171 rev. 1, (Part 3 Audio), May 30, 1995.
International Organisation for Standardisation Organisation Internationale De Normalisation ISO/IEC JTC1/SC29/WG11 Coding of Moving Pictures and Audio, "Information Technology--Generic Coding of Moving Pictures and Audio: Audio ISO/IEC 13818-3", Second Addition, Feb. 20, 1997.
Martin Boliek, "Real-Time Discrete Cosine Transform Chip Using Generalized Chen Transform Technology,"pp. 428-431, Ricoh California Research Center, Menlo Park, CA.
Unknown, "Digital Audio Compression (AC-3)," T3 review copy of draft ATSC audio standard, Aug. 12, 1994, Doc. T3/251.
Unknown, "Information Technology--Generic Coding of Moving Pictures and Associated Audio Information: Video," ISO/IEC 13818-2, Draft International Standard, Nov. 9, 1994.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Audio decoder core constants ROM optimization does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Audio decoder core constants ROM optimization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio decoder core constants ROM optimization will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-592926

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.