Circuit for digital phase difference measuring and synchronizing between pulse trains
US4471299A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1983 |
| Grant date | Sep 11, 1984 |
| Priority date | — |
| Expiry date | Jun 30, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for digitally evaluating the magnitude of the phase error between a reference and a locally generated train (sequence) of pulses. The reference train (sequence) may be, for example, the received horizontal sync pulse in a television receiver and the locally generated synchronizable horizontal trigger of the receiver. The reference pulse train (sequence) contains statistical noise and noise pulses and by multiple phase error sampling (digital) and averaging a much more accurate phase error measurement is obtained. Circuits for directly synchronizing the local trigger generator from the measured phase error are also included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.