Apparatus and methods for coding, decoding, analyzing and synthesizing a signal
US4672670A · kind A · utility
67Cited by
3References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1983 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Jul 26, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/27
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an ADPCM (Adaptive Differential PCM) system, in which the signal is commonly coded in C.sub.i, Q.sub.n, and .sigma. parameters, a lower sampling rate which normally causes distortion is made possible by deriving additional parameters A.sub.k, B.sub.k as a function of the error (distortion) between the original signal S.sub.n and the sampled signal Y.sub.n. The A.sub.k, B.sub.k coefficients control a distortion filter at the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.