Method and apparatus for downmixing decoded data streams in the frequency domain prior to conversion to the time domain
摘要
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).
申请公布号
US5946352(A)
申请公布日期
1999.08.31
申请号
US19970851575
申请日期
1997.05.02
申请人
TEXAS INSTRUMENTS INCORPORATED
发明人
ROWLANDS, JONATHAN;LI, STEPHEN (HSIAO YI);LACZKO, SR., FRANK L.;GILL, MARIA B.H.;KAM, DAVID (SHIU W.);YOUM, DONG-SEOK