Texas Instruments Corporation

Dong-Seok Youm

Frank L Laczko, Sr

Jonathan L Rowlands

Maria B H Gill

Stephen (Hsiao Yi) Li

Fuk Ho Pius Ng

Stephen (Hsiao Li

Maria Bh Gill

David (Shiu) W Kam

David (Shiu Kam

A data processing device is provided which has multiprocessors that can be configured on a cycle by cycle basis as loosely coupled or tightly coupled. Bit-stream Processing Unit (BPU),executes instructions from ROM,and accesses data from RAM,. Similarly, Arithmetic Unit (AU),executes instructions from ROM,and accesses data from RAM,. Both processor operate in parallel and exchange data by accessing RAM,. AU,can receive an instruction directive from BPU,directing it to perform a selected sequence of instructions in a loosely coupled manner. AU,can also receive an instruction directive from BPU,directing that a portion of AU,operationally replace a portion of BPU,for the duration of one instruction which allows data to be passed directly between the processors in a tightly coupled manner.

Microprocessor with functional units that can be selectively coupled

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).

Method and apparatus for downmixing decoded data streams in the

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Richardson, TX, United States of America

Dong-Seok Youm