Facsimile recorder with sweep rate detection

Facsimile and static presentation processing – Facsimile – Recording apparatus

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Details

358267, 358285, H04N 136

Patent

active

042233577

ABSTRACT:
A facsimile recorder having the capacity to record signals at different sweep rates and a circuit to distinguish noise from synchronization pulses so that the correct sweep rate will be utilized. The circuit includes a grounded timer switch which receives a start signal and opens to the voltage of the circuit and another switch which is opened to ground during the period between each of the phasing pulses. Two capacitors are arranged in parallel to receive a charge simultaneously while the switch is opened but a diode between them allows discharge of only the first of them when there is an interruption due to either noise or the next synchronization pulse. Since the rate of charge on the capacitors is substantially linear with respect to time, the charge on the second capacitor will remain at the highest level seen between the end of one pulse and a burst of noise or the next pulse if there is no noise. The voltage of the second capacitor is displayed to level detectors which signal a logic circuit in the recording equipment to direct the sweep rate of the recorder.

REFERENCES:
patent: 2873315 (1959-02-01), Fricks
patent: 3492424 (1970-01-01), Hare et al.
patent: 3510057 (1970-05-01), Werme
patent: 3761610 (1973-09-01), Krallinger et al.
patent: 3831091 (1974-08-01), Kanitz et al.

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