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. 31, 1983
Filed:
Feb. 17, 1981
Michinori Naito, Tokyo, JP;
Trio Kabushiki Kaisha, Tokyo, JP;
Abstract
An FM stereo demodulator comprising a switching signal generator for providing four asymmetrical square wave switching signals whose phase differences from the subcarrier of the FM stereo composite signal are respectively 0.degree., 90.degree., 180.degree., and 270.degree. and whose frequencies are the same as the frequency of the subcarrier; four switching circuits for respectively switching the FM stereo composite signal using the four switching signals; and an undesired-beat cancellation circuit for producing left and right audio signals from the respective output signals of the four switching circuits by cancelling the undesired beat signals in the audio frequency zone, produced by the second harmonic component of the subcarrier and SCA signals contained in the FM stereo composite signals.