Mode recognition for vertical countdown

Details Mode recognition for vertical countdown Mode recognition for vertical countdown

1986-10-09

1988-03-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358155, H04N 504

Patent

active

047290234

ABSTRACT:
An improved vertical countdown system for a television receiver which recognizes weak signal conditions in the received signal. Upon recognition of weak signal conditions or a noise indication from a noise dectector, circuitry provides a signal which is used to drive the receiver circuitry into a forced-standard operation mode for internally generating the vertical drive pulse. Circuitry is employed to monitor the received signal to determine whether sufficient vertical sync information is being received thus detecting whether the received signal is too weak. Also, compatible logic circuitry is monitored to determine whether the received signal has extraneous pulses normally characteristic of a noisy signal. Also, the circuit may be modified to increase or decrease its sensitivity to signal strength fluctuation.

REFERENCES:
patent: 3903474 (1975-09-01), Wiley
patent: 3995109 (1976-11-01), McNay
patent: 4025951 (1977-05-01), Eckenbrecht
patent: 4122488 (1978-10-01), Mikado
patent: 4228461 (1980-10-01), Weissmueller
patent: 4298890 (1981-11-01), Lai et al.

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