Frequency translation phase-locked loop for separate or intercarrier type television sound detection
US4511924A · kind A · utility
10Cited by
0References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1982 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Oct 29, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/607
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a received television signal. The PLL includes a switching arrangement which, in a first position causes the loop to process the IF picture and sound carriers for detecting the audio information in an intercarrier type of detection method and, in a second position causes the loop to process the IF sound carrier for detecting the audio information without the use of the received picture carrier, in a "separate" (split-sound) type of audio detection method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.