MPEG 2 DECODER FOR MAC MAC

A synthesis filter for an MPEG-2 audio decoder as set forth in claim 1, wherein said first storage means is a 2048-word read only memory.Д§. A synthesis filter for an MPEG-2 audio decoder as set forth in claim 1, wherein each of said first and second multiplication/accumulation means includes:ДЄ 36-bit accumulator for accumulating 32 31-bit multiplied values from said 16Г—16 signed multiplier without overflow.Д¦. A synthesis filter for an MPEG-2 audio decoder as set forth in claim 1, wherein said system control means is adapted to initialize an accumulator of said first multiplication/accumulation means whenever it performs the accumulation operation 32 times and to initialize an accumulator of said second multiplication/accumulation means whenever it performs the accumulation operation 16 times.ДҐ. A synthesis filter for an MPEG-2 audio decoder as set forth in claim 1, wherein said system control means is adapted to connect a fourth bit k of a 9-bit counter directly to first and second addresses V a and D a and then sequentially incrementing said 9-bit counter by one from 0 to satisfy the following equation: #EQU4# where S j represents audio data, V a =j+128i+96k, D a =j+64i+32k, 0в‰¤kв‰¤1,0в‰¤iв‰¤7, and 0в‰¤jв‰¤31.Д¤. Windowing/overlapping means for copying the contents of said third storage means to said fourth storage means and then controlling said second multiplication/accumulation means to perform a windowing/overlapping operation.ДЈ. Matrixing control means for resetting said first multiplication/accumulation means continuously in a standby mode and starting the multiplication/accumulation operation of said first multiplication/accumulation means upon receiving a main subframe start signal and A synthesis filter for an MPEG-2 audio decoder as set forth in claim 1, wherein said system control means includes: System control means for controlling multiplication/accumulation operations of said first and second multiplication/accumulation means.Дў. Sixth storage means for storing the audio data from said second multiplication/accumulation means therein Дigital/analog conversion means for converting the audio data stored in said sixth storage means into an analog audio signal and outputting the converted analog audio signal to a speaker and Second multiplication/accumulation means for synthesizing the contents copied to said fourth storage means with the window coefficients stored in said fifth storage means to produce audio data

Third storage means for storing output data from said first multiplication/accumulation means therein ДЇourth storage means being copied with the contents of said third storage means ДЇifth storage means for storing window coefficients therein Second storage means for storing subband data therein ДЇirst multiplication/accumulation means for performing a matrixing operation by multiplying the subband data stored in said second storage means by the cosine matrix coefficients stored in said first storage means A synthesis filter for a Motion Pictures Experts Group-2 (MPEG-2) audio decoder comprising:ДЇirst storage means for storing cosine matrix coefficients therein

MPEG 2 DECODER FOR MAC MAC

A synthesis filter for an MPEG-2 audio decoder comprising a first coefficient ROM for storing cosine matrix coefficients therein, a first queue memory for storing subband data therein, a first MAC unit for performing a matrixing operation by multiplying the subband data stored in the first queue memory by the cosine matrix coefficients stored in the first coefficient ROM, a second queue memory for storing output data from the first MAC unit therein, a third queue memory being copied with the contents of the second queue memory, a second coefficient ROM for storing window coefficients therein, a second MAC unit for synthesizing the contents copied to the third queue memory with the window coefficients stored in the second coefficient ROM to produce audio data, an FIFO memory for storing the audio data from the second MAC unit therein, a D/A converter for converting the audio data stored in the FIFO memory into an analog audio signal and outputting the converted analog audio signal to a speaker, and a controller for controlling multiplication/accumulation operations of the first and second MAC units.ДЎ.

Mpeg 2 decoder for mac