Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-01-13
1990-06-12
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358196, 358198, H04N 552, H04N 560
Patent
active
049337670
ABSTRACT:
A video intermediate frequency signal processing circuit includes synchronous detection circuit (77) which receives a video intermediate frequency signal through a path including a bandpass filter (51), a phase locked loop circuit (59) and an automatic phase control loop (67), and another path including another bandpass filter (53). Both signals received by the synchronous detection circuit (77) are maintained to be the same in phase by virtue of the operation of the automatic phase control loop (67), so that the synchronous detection circuit (77) generates a video detection output signal including a video signal accurately demodulated and a sound intermediate frequency signal having no phase modulation component causing a sound buzz.
REFERENCES:
patent: 4811096 (1989-03-01), Gukamura
P. Fockens, C. G. Eilers; Intercarrier Buzz Phenomena Analysis and Cures, IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug. 1981, pp. 381-397.
A. Hamada, Phase-Lock Television IF Amplifier-Video Detector, IEEE Transactions on Consumer Electronics, vol. CE<21, No. 4, Nov. 1975, pp. 340-347.
M. Huber, H. Kriedt, R. Stepp, Modular Video IF Concept, IEEE Transactions on Consumer Electronics, vol. CE-29, No. 3, Aug. 1983, pp. 414-419.
Britton Howard W.
Mitsubishi Denki & Kabushiki Kaisha
Powell Mark R.
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