Integrated circuit for television receivers comprising a sonic separator with a clamping circuit
US4506297A · kind A · utility
2Cited by
3References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Jun 24, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/126
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To prevent the separation-level shift occurring in the clamping circuit during the transmitted vertical synchronizing pulses or during prolonged interference pulses, a pulse opening an electronic switch (S) inserted between the clamping circuit and one RC section thereof is generated by means of a coincidence stage (KO), a gate circuit (TS), an inverter (I), and an AND gate (U). The clamping circuit is thus unblocked only during the horizontal synchronizing pulses, so that no shift of the separation level can occur during the vertical synchronizing pulses or during any interference pulses in the composite color signal (F).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.