Multiplexed television signal processing system

Details Multiplexed television signal processing system Multiplexed television signal processing system

1980-08-01

1982-03-02

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 700

Patent

active

043181279

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.

REFERENCES:
patent: 3507985 (1970-04-01), Breukink et al.
Wirless World, Nov. 1975, pp. 498-504.

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