Cisco Technology, Inc.

Ke Shen

Yi Tong Tse

Fang Wu

Sangeeta Ramakrishnan

Xiaomei Liu

According to the present invention, methods and apparatus for updating reduction ratios are provided. An input bit sequence can be altered to provide modified output bit sequence. The input bit sequence may represent information in a portion of data such as a video sequence, a picture, or an audio stream. In one example, the bit sequence is an MPEG-2 video sequence. The input bit sequence is altered using a reduction ratio to provide a modified output bit sequence. The reduction ratio can be continually updated using rate control information to achieve a target reduction ratio for the input bit sequence.

Methods and apparatus for updating a reduction ratio

According to the present invention, methods and apparatus for filtering transform coefficients are provided. Transform coefficients associated with an input bit sequence can be zeroed to provide modified transform coefficients associated with an output bit sequence. The transform coefficients may represent information in a portion of data such as a video frame, a picture, or an audio stream. In one example, the transform coefficients are DCT coefficients of an MPEG-2 video sequence. The transform coefficients are filtered to provide modified transform coefficients associated with an output bit sequence. The output bit sequence is a rescaled version of the input bit sequence.

Methods and apparatus for transform coefficient filtering

Described herein are data transmission systems and methods that employ flexible memory usage techniques. The techniques allocate memory to include a plurality of block pools, where each block pool includes a set of blocks having a memory size common to the block pool. The number of block pools and common memory size for each may be determined according to the current transmission demands for the bit streams and channels being serviced. A processor for the network device then allocates data from multiple bit streams into a block in one of the block pools based on the memory requirements for the incoming data. The number of blocks may also be varied based on changing transmission demands.

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Sunnyvale, CA, United States of America

Ke Shen