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:
May. 22, 1984
Filed:
Nov. 27, 1981
Billy W Beyers, Jr, Greenfield, IN (US);
RCA Corporation, New York, NY (US);
Abstract
A tuning control system includes a pulse converter for converting a digital word to a corresponding pulse signal having pulses the width or frequency of which represents the magnitude of a tuning voltage associated with a respective channel. The pulse signal is applied to a filter which produces the tuning voltage. An automatic fine tuning (AFT) voltage is generated by an AFT discriminator in an IF section and also applied to the filter to modify the magnitude of the tuning voltage to correct for any frequency deviation of the IF signal. To make the response of the tuner to changes of the AFT voltage more uniform for different channels, the AFT voltage is applied to the filter through a switch which is selectively closed in response to the pulses of the pulse signal so as to change the effective amplitude of the AFT voltage applied to the filter as a function of the channel selected.