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3Com Corporation

Kurt Dobson

Jack Yang

Kevin J Smart

Nathan M Whitney

Peter M Rigstad

Randy C Rollins

Kenneth Morely

Phil Adams

A peripheral module capable of interaction with a host system comprises a digital signal processor (DSP), a cache controller, and minimal or no resident memory for initial storage of instructions and data. The peripheral module utilizes the memory resources (e.g., ROM and RAM) of a host system. The cache controller interfaces to the DSP and provides an instruction and data stream, upon request, from a resident cache. A bus interface unit arbitrates access to the host system via a host bus for access to host system resources by the cache controller for extracting DSP information (e.g., instructions and data) from the host system for utilization by the DSP within the peripheral module. The cache controller and cache thereby provide the instruction and data stream as required by the DSP for digital signal processing applications and relieve the need for resident storage within the peripheral module.

Apparatus and method for operably connecting a processor cache and a

The compression method utilizes a combination of both lossy and lossless compression to achieve significant compression while retaining very high subjective quality of the reconstructed or decompressed signal. Methods and apparatus for compression and decompression of digital audio data are provided. In one preferred embodiment, the compression method or apparatus has a bit rate control feedback loop particularly well suited to matching the output bit rate of the data compressor to the bandwidth capacity of a communication channel. Embodiments trade-off various error sources in order to keep perceptible distortion levels to a minimum for a fixed bit rate. Preferred embodiments also utilize a unique combination of run length and Huffman encoding methods in order to take advantage of both local and global statistics.

Method and apparatus for wavelet based data compression having adaptive

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Sandy, UT, United States of America

Kurt Dobson