Synchronous signal generator for the muse signal
US5148276A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1990 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Nov 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/091
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A synchronous signal generator for use with the MUSE signal in the MUSE system which is a high definition television systems. A PLL circuit including a phase comparator and a voltage-controlled oscillator and a counter, is used to generate a system clock synchronized with an external clock. A frame synchronizing signal detected through a frame sychronization detection circuit from an inputted digital MUSE signal frame-resets the counter through a window circuit. The frame synchronization is established at an accuracy of a set range of the window circuit. Also, in this case, if the sychronization deviates on a clock by clock basis, a sampling phase error from a phase error computing circuit is monitored by a comparator circuit so that a deviation in the synchronization can be detected. When the synchronization deviates, by horizonally resetting the counter, the clock synchronization can be established. By effecting the three steps noted above, the synchronous signal generation for the digital MUSE signal can be properly achieved. Also, by combining an arrangement noted above with a conventional synchronous signal for an analog MUSE signal, a synchronous signal generator for both a d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.