Telegraphy – Systems – Line-clearing and circuit maintenance
Patent
1973-01-02
1976-01-27
Griffin, Robert L.
Telegraphy
Systems
Line-clearing and circuit maintenance
H04L 506
Patent
active
039353877
ABSTRACT:
A TV pulse generator for generating television synchronizing and blanking signals and a chrominance subcarrier gating signal. The switchable generator is formed with a clock pulse generator having a frequency which, for the CCIR and the RTMA standards, is 80 times the line frequency. In addition to auxiliary pulses of field frequency, circuits of frequency dividers formed with JK flip-flops and pulse generators also generate auxiliary pulses of line frequency and of double the line frequency. The edges in the synchronizing and blanking signals and in the PAL or NTSC chrominance subcarrier gating signal generated by signal generators are accurately determined by trigger signals derived from the clock pulses.
REFERENCES:
patent: 2720555 (1955-10-01), Krause
patent: 2748188 (1956-05-01), Stahl et al.
patent: 3487166 (1969-12-01), Ryan
patent: 3564141 (1971-02-01), Hurst
patent: 3581011 (1971-05-01), Ward et al.
Griffin Robert L.
Steckler Henry I.
Stellar George G.
Trifari Frank R.
U.S. Philips Corporation
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