Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-07-24
1983-08-09
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358139, 358 10, 358198, H04N 550
Patent
active
043982204
ABSTRACT:
The present invention comprises a tuning detecting circuit, a synchronization detecting circuit, an audio noise detecting circuit, a logic circuit and a muting circuit. According to the present invention, a tuning detecting circuit detects the tuning state (i.e., proper tuning, mistuning and slight mistuning) of the local oscillator. The tuning detecting circuit receives a pair of oppositely phased signals (AFT1, AFT2) from an automatic fine tuning circuit, and generates an output signal indicative of the tuning state of the local ascillator. A synchronization detecting circuit, receiving synchronizing signals and flyback pulses, determines whether the synchronization is maintained; this circuit generates an output signal indicative of the synchronization of the synchronizing signals and the flyback pulses. An audio noise detecting circuit receiving an audio intermediate frequency (IF) signal, detects whether the IF signal includes a noise component, and generates an output signal indicative of the presence of noise. A logic circuit receives the output signals from the tuning, synchronization and audio noise detecting circuits. Depending on the operational states, the logic circuit generates either a first output signal, a second output sign, or a third output signal indicative of the operational states.
REFERENCES:
patent: 2632800 (1953-03-01), Schlesinger
patent: 2910530 (1959-10-01), Clark
patent: 3518365 (1970-06-01), Chaddha
patent: 4025953 (1977-05-01), Sideris
patent: 4038689 (1977-07-01), Rzeszewski
patent: 4340908 (1982-07-01), Wakabayashi
Abstract No. DT 2741-506.
Masinick Michael A.
Tokyo Shibaura Denki Kabushiki Kaisha
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