Texas Instruments Corporation

Stephen H Li

Frank L Laczko, Sr

Gerard V Benbassat

Jonathan L Rowlands

Karen L Walker

Shiu Wai Kam

Kenneth R Cyr

A data processing system (10) is disclosed which comprises a microprocessor host (12) coupled to a decoding system (14). A host interface block (18) receives a bit stream and passes bit stream on to a system decoder block (20). The system decoder block (20) extracts the appropriate data from the bit stream and loads an input buffer (24) or an optional external buffer (26). An audio decoder block (28) retrieves the data from the input buffer (24) and generates scale factor indices, bit per code word values and subband samples which are stored in an arithmetic unit buffer (30). A hardware filter arithmetic unit block (32) retrieves the information from the arithmetic unit buffer (30) and dequantizes, transforms and filters the data to generate PCM output data which is loaded into a PCM buffer (34). The data within the PCM buffer (34) is output by a PCM output block (36) to a digital-to-analog converter (16).

Audio decoder circuit and method of operation

A data processing device uses a portion of a random access memory as an input buffer 114 for holding a portion of a stream of data which is being processed by a processing unit within the processing device. A Get Bit-Field instruction is provided which directs the processing unit to extract selected bit fields from the data stream stored in the input buffer. A register R6 holds a bit address which points to the end of a selected bit field, while a register R0 holds the width of the selected bit field. An address register is connected to a register R6 in a manner that allows data words to be accessed in input buffer 114 using only a word portion of the bit address. A funnel shifter 203 is disposed to extract the selected bit field from concatenated data words in response to a bit address portion of the bit address in register R6.

Device and method for extracting a bit field from a stream of data

Method for processing a subband encoded audio data stream

System decoder circuit with temporary bit storage and method of operation

A data processing system (10) uses a microprocessor host (12) coupled to a decoding system (14). A hardware filter arithmetic unit block (32) retrieves decoded information from the arithmetic unit buffer (30) and dequantizes, transforms and filters the data to generate PCM output data which is loaded into a PCM buffer (34). An address circuit forms several addresses from a single value to accesses multiple sources of data and coefficients simultaneously for use by the hardware filter arithmetic unit.

Hardware filter circuit and address circuitry for MPEG encoded data

Integrated audio decoder system and method of operation

System decoder circuit and method of operation

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Garland, TX, United States of America

Stephen H Li