Method for decoding MPEG audio data
DC
First Claim
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1. A method for decoding an MPEG audio data frame, comprising the steps of:
- decoding subband data from an audio data frame to generate a first vector, the first vector having components which represent frequency-domain components of a sound sample;
combining two or more components of the first vector, using a butterfly unit;
determining a product of the combination and a matrixing coefficient, using a multiplier;
accumulating the product into a memory location; and
repeating the combining, determining, and accumulating steps one or more times to determine a component of a second vector, the second vector having components which represent frequency-domain components of a sound sample.
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Abstract
An MPEG audio/video decoder has memories, a signal processing unit (SPU) including a multiplier and a butterfly unit, a main CPU, and a memory controller which are time division multiplexed between decoding video and audio data. For audio decoding, the butterfly unit determines combinations of components of a frequency-domain vector to reduce the number of multiplies required to transform to the time domain (matrixing). Matrixing is interwoven with MPEG filtering to increase throughput of the decoder by increasing parallel use of the multiplier, the butterfly unit, and a memory controller.
9 Citations
15 Claims
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1. A method for decoding an MPEG audio data frame, comprising the steps of:
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decoding subband data from an audio data frame to generate a first vector, the first vector having components which represent frequency-domain components of a sound sample; combining two or more components of the first vector, using a butterfly unit; determining a product of the combination and a matrixing coefficient, using a multiplier; accumulating the product into a memory location; and repeating the combining, determining, and accumulating steps one or more times to determine a component of a second vector, the second vector having components which represent frequency-domain components of a sound sample. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for decoding an MPEG audio data frame, comprising:
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decoding subband data from an audio data frame to generate a sample vector S having components Si which represent frequency-domain components of a sound sample, wherein index i ranges from 0 to M; combining two or more of said components Si to produce a linear, unscaled combination Tk of said two or more components Si; repeating said combining M times to obtain a plurality of said combinations Tk; multiplying selected ones of said combinations Tk with selected ones of coefficients from a transformation matrix N to form a plurality of products; adding selected products from said multiplying to obtain a vector component Vj of a vector V; and determining a time-domain sound amplitude from said vector component Vj. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification
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Litigation Data
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Current AssigneeLSI Logic Corporation (Broadcom, Inc.)
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Original AssigneeC-Cube Corporation (Broadcom, Inc.)
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InventorsGalbi, David E.
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Primary Examiner(s)Dorvil, Richemond
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Application NumberUS08/548,895Time in Patent Office1,188 DaysField of Search391/2.09, 391/2.91, 391/2.94, 391/2.12, 704/200, 704/500, 704/501, 704/503, 704/504, 704/203, 704/222, 704/229, 704/230, 704/211, 704/212, 704/205, 382/232, 382/233, 382/238, 382/239, 382/253US Class Current704/503CPC Class CodesG09G 2340/02 Handling of images in compr...G10L 19/005 Correction of errors induce...G10L 19/02 using spectral analysis, e....H03M 7/425 for the decoding process onlyH04N 19/00 Methods or arrangements for...H04N 19/124 QuantisationH04N 19/126 Details of normalisation or...H04N 19/13 Adaptive entropy coding, e....H04N 19/42 characterised by implementa...H04N 19/423 characterised by memory arr...H04N 19/43 Hardware specially adapted ...H04N 19/433 characterised by techniques...H04N 19/436 using parallelised computat...H04N 19/439 using cascaded computationa...H04N 19/44 Decoders specially adapted ...H04N 19/60 using transform codingH04N 19/61 in combination with predict...H04N 19/63 using sub-band based transf...H04N 19/70 characterised by syntax asp...H04N 19/90 using coding techniques not...View All
