Michael R Perkins

US Patent:

54206391, May 30, 1995

Filed:

Apr 1, 1993

Appl. No.:

8/041670

Inventors:

Michael G. Perkins - Lawrenceville GA

Assignee:

Scientific-Atlanta, Inc. - Norcross GA

International Classification:

H04N 732

US Classification:

348418

Abstract:

Methods for compressing data in a system employing vector quantization (VQ) and Huffman coding comprise: First, quantizing an input vector by representing the input vector with a VQ codevector selected from a VQ codebook partitioned into subsets, wherein each subset comprises codevectors and each codevector is stored at a corresponding address in the VQ codebook. Next, generating a rate dependent Huffman codeword for the selected codevector, wherein the rate dependent Huffman codeword identifies the subset of the VQ codebook in which the selected codevector is stored. And finally, generating a substantially rate independent Huffman codeword for the selected codevector, wherein the substantially rate independent Huffman codeword identifies a particular VQ codevector within the subset identified by the rate dependent Huffman codeword.

US Patent:

61887293, Feb 13, 2001

Filed:

Apr 1, 1993

Appl. No.:

8/041446

Inventors:

Michael G. Perkins - Lawrenceville GA

Assignee:

Scientific-Atlanta, Inc. - Norcross GA

International Classification:

H04N 730

US Classification:

3752402

Abstract:

A video compression system comprises a control computer 52; a plurality of encoders 54, 56, 58; a plurality of encoder buffers 60, 62, 64; a multiplexor 66; a data channel 70; a demultiplexor 80; a decoder buffer 82; a decoder 84; and display 86. The control computer controls the encoders and the multiplexor 66 to avoid overflows and underflows of data provided to the decoder buffer 82.