SECAM decoder with phase-locked loop demodulators
US5194938A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1991 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Sep 17, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/186
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A SECAM decoder comprises an input receiving a chrominance subcarrier (SP); first and second outputs delivering respectively the decoded blue (B2) and red (R2) signals; a first PLL phase demodulator (30) receiving the subcarrier (SP), operative only during the blue lines; a second PLL phase demodulator (31) receiving the subcarrier, operative only during the red lines; a first adder (32) receiving the output signal (B1) of the first demodulator (30) and this same signal delayed by a line period to deliver the decoded blue signal (B2); an adder (33) receiving the output signal (R1) of the second demodulator (31) and this same signal delayed by a line period to deliver the red decoded signal (R2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.