System and method for compression and decompression of audio signals
US5673364A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1993 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Dec 1, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/09
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A speech compression/decompression system and method which do not require special hardware are described. The compression unit represents an input audio signal as a collection of parameters, wherein the parameters are a remnant excitation pulse sequence, a set of spectral coefficients and a set of pitch parameters. The decompression unit utilizes the pitch parameters and remnant excitation pulse sequence to produce a reconstructed excitation signal. The decompression unit also utilizes the spectral coefficients to filter the reconstructed excitation signal into a speech waveform. The compression unit includes a short-term predictor, a two-step long-term predictor and a multi-pulse analyzer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.