Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-06-17
1986-09-09
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, H04N 504
Patent
active
046112294
ABSTRACT:
A circuit for phase locking the flyback pulse to a reference signal. A phase detector receives the flyback pulse (to be phase locked) and receives the reference signal. It outputs an error signal to a control circuit including first and second differential amplifiers having differing operational characteristics, one being linear in a narrower range than the other. The differential amplifier having the larger linearity range provides control signals to a coarse delay adjust circuit in the form of a programmable divider which also receives clock pulses at a high multiple of the horizontal frequency f.sub.H. The output of the coarse delay adjust circuit is applied to a fine delay adjust circuit responsively connected to the output of the first differential amplifier, which is linear over the narrower range. The output of the fine delay adjust circuit is coupled to the horizontal system. Large changes in the phase of the flyback signal are achieved by recognizing large deviations in the wider range differential amplifier and causing the coarse delay adjust circuit to make a relatively large adjustment in the phase of the output signals thereof. Thereafter, fine adjustments are made by the fine delay adjustment circuit in response to control signals from the narrower range differential amplifier.
REFERENCES:
patent: 3505473 (1970-04-01), Dillenburger et al.
patent: 4122488 (1978-10-01), Mikado
patent: 4151485 (1979-04-01), LaFratta
patent: 4309662 (1982-01-01), Baudoux
patent: 4335403 (1982-06-01), Srivastava
patent: 4467359 (1984-08-01), Hosoya
patent: 4498103 (1985-02-01), Aschwanden
Lee Ronald B.
Srivastava Gopal K.
Chin Tommy P.
Harvey David E.
Zenith Electronics Corporation
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