Lossless and loss-limited compression of sampled data signals
US5839100A · kind A · utility
Inventor
Key dates
| Filing date | Apr 22, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Apr 22, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B14/068
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An efficient method for compressing audio and other sampled data signals without loss, or with a controlled amount of loss, is described. The compression apparatus contains a subset selector, an approximator, an adder, two derivative encoders, a header encoder, and a compressed block formatter. The decompression apparatus contains a compressed block parser, a header decoder, two integration decoders, an approximator, and an adder. The compressor first divides each block of input samples into a first subset and a second subset. The approximator uses the first subset samples to approximate the second subset samples. An error signal is created by subtracting the approximated second subset samples from the actual second subset samples. The first subset samples and error signal are separately encoded by the derivative encoders, which select the signal's derivative that requires the least amount of storage for a block floating point representation. A compressed block formatter combines the compression control parameters, encoded subset array, and encoded error array into a compressed block. The decompression apparatus first parses the compressed block into a header, an encoded first subs…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.