The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1980
Filed:
Oct. 23, 1978
Gerald L Vano, Brockton, MA (US);
Alden Research Foundation, Brockton, MA (US);
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.