VSB mode selection system
US5745528A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1995 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Jul 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transmitted digital VSB signal comprises a sequence of M-level symbols, where the value of M is defined by a mode control signal which is periodically multiplexed with the transmitted signal. A receiver includes an up/down counter which is reset to a zero count in response to a channel change signal and a latch responsive to the zero count of the counter for storing the next received mode control signal whose accuracy has been verified. The counter is incremented or decremented in response to each subsequently received verified mode control signal which respectively matches or does not match the stored mode control signal. Acquisition of new mode control signals is thereby relatively immune to burst noise, is effected very rapidly after a channel change and less rapidly in the absence of a channel change.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.