SECAM decoder with phase-locked loop demodulators

Details SECAM decoder with phase-locked loop demodulators SECAM decoder with phase-locked loop demodulators

1991-09-17

1993-03-16

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, H04N 1118

Patent

active

051949385

ABSTRACT:
A SECAM decoder comprises an input receiving a chrominance subcarrier (SP); first and second outputs delivering respectively the decoded blue (B2) and red (R2) signals; a first PLL phase demodulator (30) receiving the subcarrier (SP), operative only during the blue lines; a second PLL phase demodulator (31) receiving the subcarrier, operative only during the red lines; a first adder (32) receiving the output signal (B1) of the first demodulator (30) and this same signal delayed by a line period to deliver the decoded blue signal (B2); an adder (33) receiving the output signal (R1) of the second demodulator (31) and this same signal delayed by a line period to deliver the red decoded signal (R2).

REFERENCES:
patent: 4117410 (1978-09-01), Bender
patent: 4249201 (1981-02-01), Christiansen et al.
patent: 4553156 (1985-11-01), Douziech
patent: 4631487 (1986-12-01), Beech
patent: 4933749 (1990-06-01), Van Lammeren

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