Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-01-19
1977-02-15
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
178DIG12, H04N 508
Patent
active
040083705
ABSTRACT:
A synchronizing signal amplifier which has an input terminal coupled to a source of synchronizing signals and noise signals by means of a capacitor has its common terminal coupled to reference potential by means of a switching circuit having its input terminal coupled to the source of synchronizing signals and noise signals. When signals produced by the source of synchronizing signals and noise signals are less than a noise threshold level established by the switching means, the common terminal of the amplifier is coupled to reference potential by the switching means and the current through the capacitor is basically a function of the input impedance of the amplifier.
When noise pulses produced by the source of synchronizing signals and noise signals are greater than the noise threshold level, the common terminal of the amplifier is decoupled from reference potential by the switching means and the current through the capacitor is a function of the input impedance of the switching means which is much greater than the input impedance of the amplifier. The change of charging impedance reduces the change of charge on the capacitor during noise pulses.
REFERENCES:
patent: 3441669 (1969-04-01), Janson et al.
patent: 3639780 (1972-02-01), Lovelace
Rasmussen Paul J.
RCA Corporation
Richardson Robert L.
Whitacre Eugene M.
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