Audio decoder core constants ROM optimization
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United States of America Patent
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Aug 22, 2000
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app pub date -
Apr 17, 1998
filing date -
May 3, 1996
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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.
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Patent Owner(s)
- AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kolluru, Mahadev S | Santa Clara, CA | 11 | 325 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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