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:
Mar. 16, 1982
Filed:
Mar. 27, 1978
Takashi Kikuchi, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A first generator 1 produces a continuously increasing signal corresponding to the tone arm pick-up stylus position, and a second generator 2 produces a synchronizing signal comprising a pulse for each turntable rotation. The synchronizing pulses alternately gate the position signal between a pair of parallel peak holding circuits 5a, 5b whose differential output S is compared with a reference signal T, and when the former exceeds the latter the tone arm is returned. Any cyclical variations in the position signal due to the eccentricity of the record spindle hole are self-cancelling during the differential comparison because their magnitudes are substantially the same when sampled during the same relative periods of the turntable rotation cycle. The high pitch of the lead-out groove at the end of the record play produces a large differential output signal, to thereby trigger the tone arm return.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile