SECAM Color identifying circuit

Details SECAM Color identifying circuit SECAM Color identifying circuit

1984-07-30

1986-03-04

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 14, 358 19, H04N 947, H04N 1118, H04N 945, H04N 9455

Patent

active

045743010

ABSTRACT:
The invention relates to color television receivers.
Bursts which are transmitted during the line and field retrace-periods and whose frequencies change from one line to the other between 4.25 MHz (blue, luminance) and 4.40625 MHz (red-luminance) are used to obtain a color identification for each line.
To that end a frequency-shift discriminator in which the chrominance subcarrier is switched between two paths, one path being direct and the other comprising a phase shifting circuit, the two parts (9, 10) being thereafter switched to the two inputs of a multiplier (4) whose output signal thus comprises a frequency-dependent DC component. According to the invention, the phase shifting circuit included in one of the paths is constituted by the so-called "cloche" filter (2) which is usually used in all SECAM television sets and which thus fulfills in the circuit according to the invention a special function in addition to its customary functions (FIG. 1).

REFERENCES:
patent: 4072983 (1978-02-01), Aschwander
patent: 4240102 (1980-12-01), Groeneweg
patent: 4357623 (1982-11-01), Hinn
patent: 4408222 (1983-10-01), Gay

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