Multiplexed television signal processing system
US4318127A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1980 |
| Grant date | Mar 2, 1982 |
| Priority date | — |
| Expiry date | Aug 1, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0355
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal processing system in a transmission system like Teletext System in which a binary signal is superimposed on a television signal for transmission is disclosed. When the binary signal is received, an upper (or lower) level of a pilot signal in the binary signal is clamped to a first reference voltage by a clamp circuit while the amplitude of the pilot signal is controlled by a variable gain amplifier such that the lower (or upper) level of the pilot signal becomes equal to a third reference level. The binary signal is then amplitude-discriminated using a second reference voltage as a discrimination reference. In this manner, the binary signal is correctly converted to a digital signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.