Adaptive compression and decompression of bandlimited signals
US7009533B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 2004 |
| Grant date | Mar 7, 2006 |
| Priority date | — |
| Expiry date | Mar 1, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/413
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An efficient method for compressing sampled analog signals in real time, without loss, or at a user-specified rate or distortion level, is described. The present invention is particularly effective for compressing and decompressing high-speed, bandlimited analog signals that are not appropriately or effectively compressed by prior art speech, audio, image, and video compression algorithms due to various limitations of such prior art compression solutions. The present invention's preprocessor apparatus measures one or more signal parameters and, under program control, appropriately modifies the preprocessor input signal to create one or more preprocessor output signals that are more effectively compressed by a follow-on compressor. In many instances, the follow-on compressor operates most effectively when its input signal is at baseband. The compressor creates a stream of compressed data tokens and compression control parameters that represent the original sampled input signal using fewer bits. The decompression subsystem uses a decompressor to decompress the stream of compressed data tokens and compression control parameters. After decompression, the decompressor output signal is p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.