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:
Feb. 08, 1977
Filed:
Jun. 13, 1975
Kimitake Utsunomiya, Tokyo, JA;
Sony Corporation, Tokyo, JA;
Abstract
An F-M demodulator circuit including a multivibrator and a differential amplifier that have common output electrodes and a capacitor thereacross demodulates a frequency modulated signal differentially applied to input electrodes of the amplifier. The state of conductivity of the multivibrator reverses at a fixed time after reversal of the state of conductivity of the differential amplifier. The capacitor is charged to opposite polarities alternately, according to the relative states of conductivity of the multivibrator and differentially amplifier, by constant current pulses of equal duration. A pulse signal based on the rate of occurrence of the charging pulses has a duty cycle linearly related to the frequency of the modulating signal, and filtering this pulse signal extracts the modulating signal.