Extraction of an exact symbol rate as applied to bandwidth compression of modem signals through demodulation and remodulation
US5123033A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1990 |
| Grant date | Jun 16, 1992 |
| Priority date | — |
| Expiry date | Sep 27, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0029
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An original symbol rate of a transmitted modem signal which has been demodulated for digital transmission is recovered at a network receiver by obtaining an estimate of error between the original transmitted symbol rate and a known nominal symbol rate. This is realized at the network receiver by measuring an interval between blocks of data in a received signal having other than a known nominal number of data bits. This is achieved because each of the blocks of data is of a known fixed interval. The measured interval is proportional to the desired error estimate. The error estimate is then integrated and employed in an interpolator to adjust the symbol rate of a remodulated modem signal at the network receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.