Motorola Corporation

Eric S Collins

Brett L Lindsley

Reginald JuVann Hill

Mark Timko

A method and apparatus for compression/decompression and filtering of a signal in which the apparatus has an input register ( ) which receives the received signal, an output register ( ) which transmits a processed signal and a distributed arithmetic processor ( ) having a plurality of operational modes. The distributed arithmetic processor is coupled to the input register by an input path and is coupled to the output register by an output path. The apparatus also has a DCT butterfly processor ( ) selectively switched into the input path in response to selection of a predetermined operational mode from the plurality of operational modes. An IDCT butterfly processor ( ) is also selectively switched into the output path in response to the selection of one of the predetermined operational modes. Additionally, the apparatus selectively functions as a FIR filter with both the DCT butterfly processor ( ) and IDCT butterfly processor ( ) removed from the input and output paths.

Method and apparatus for compression/decompression and filtering of a signal

An arbitration and task switching technique in a real-time multiprocessor data processing system (20) having a common bus (32) and a segmented shared memory (30), where fullness of memory segments of the shared memory (30) is used as a measurement for arbitration and task switching priorities. A bus request mechanism in each of the processors dynamically calculates normalized priority values based on relative needs across the system (20). The normalized priority calculation is based on monitoring the fullness of memory segments of the shared memory (30) associated with each processor (24, 26, 28) of the system (20). Using this normalized priority calculation, the bus access order and bus bandwidth are optimally allocated according to tasks executed by the processors (24, 26, 28). Also, the normalized priority calculation and a preprogrammed threshold is used to control task switching in the multi-processor system (20).

Growing community of inventors

Barrington, IL, United States of America

Eric S Collins