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. 15, 1990
Filed:
Nov. 21, 1988
Applicant:
Inventor:
Takashi Koga, Kanagawa, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03D / ; H03D / ;
U.S. Cl.
CPC ...
329336 ; 329342 ; 329343 ; 375 82 ;
Abstract
An FM signal demodulator for converting the frequency of an input signal to a corresponding voltage. The demodulator includes a delay circuit responsive to the input signal for delaying the phase of the input signal by a fixed time, an exclusive-OR gate responsive to the input signal and the delayed phase signal from the delay circuit for outputting a pulse signal having a duration corresponding to the fixed time and an LPF responsive to the pulse signal for generating an output signal having a level which changes in response to changes in the frequency of the input signal.