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:
Jun. 01, 1976
Filed:
Jun. 23, 1975
Hirotaka Kurata, Tokyo, JA;
Sansui Electric Co., Ltd., Tokyo, JA;
Abstract
A composite signal for a four-channel stereo broadcast includes a main channel component, first and second sub-channel components and at least one pilot signal. The composite signal is fed to a stereo signal demodulator through an FM tuner. The stereo signal demodulator derives the pilot signal out of the composite signal to produce first and second sampling pulse series, each sampling pulse having a different repetition frequency. The first sampling pulse series is fed to a delay circuit that is provided with electronic delay lines such as dynamic shift registers. The delay circuit is switched by the first sampling pulse series for sampling the composite signal, to shift sampled values. Sampled values delayed in the delay circuit are fed to a logical circuit to derive the main and first sub-channel components. The second sampling pulse series is supplied to a switching circuit for demodulating the second sub-channel component. The main and first sub-channel components are substantially equalized to the second sub-channel component in delay time.