Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1987-07-07
1989-05-30
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
328114, 329131, 358167, 360 381, H04N 594, H04N 5782, H03D 324
Patent
active
048356220
ABSTRACT:
A demodulator arrangement including a phase-locked loop PLL (11) having an output (17) coupled to an input (23) of a hold circuit (24) also includes detection means (27) for detecting an instantaneous interference (FIG. 4b) in the signal present at the input (10) of the PLL (11) and for subsequently generating a control signal (FIG. 4e) which is applied to a control input (29) of the hold circuit. The hold circuit is adapted to retain the signal applied to its input (23) during the time interval (T.sub.3) when the control signal is presented to its control input (27). The detection means (27) are adapted to determine a phase-lock error between the signal at the input of the PLL (11) and the signal at the output (20) of a voltage-controlled oscillator VCO (19) associated with the PLL (11) and to generate the control signal if the phase-lock error exceeds a given value, for example, 45.degree.. A better detection of the instantaneous interferences can be realized with such an arrangement in comparison with the use of the amplitude information (if present) of the signal at the input (10) of the PLL (11).
REFERENCES:
patent: 4117410 (1978-09-01), Bender
patent: 4361813 (1982-11-01), Watatani
patent: 4403262 (1983-09-01), Ito et al.
patent: 4604659 (1986-08-01), Itoh et al.
patent: 4688103 (1987-08-01), Akiyama
patent: 4692914 (1987-09-01), Yasumura et al.
Franzblau Bernard
McElheny Jr. Donald
U.S. Philips Corp.
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