Multiple-loop adaptive delta modulator
US4411003A · kind A · utility
11Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Jul 20, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/024
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An adaptive delta modulator employs an additional feedback loop to produce a more accurate estimate of the input signal. The delta modulated bit stream is applied to a filter having variable filter characteristics such as bandwidth, the output of the filter being combined with the signal estimated by the prior art adaptive delta modulator. The characteristics of the incoming signal, such as bandwidth, are determined by examining the prior art estimated signal, and the filter characteristics of the additional feedback loop are varied in accordance therewith.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.