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. 06, 1978
Filed:
Apr. 30, 1976
Anson Isaacson, Chicago, IL (US);
Howard J Morrison, Deerfield, IL (US);
Ralph H Baer, Manchester, NH (US);
Donald K Fletchic, Arlington Heights, IL (US);
Albert G Keller, Chicago, IL (US);
Marvin Glass & Associates, Chicago, IL (US);
Abstract
A programmable phonograph record changer which provides automatic sound track selection for each of a plurality of records played sequentially by the record changer. The record changer includes an electro-optic scanner mounted on the pickup arm for sensing the land areas located between the various sound tracks of a disc-type record. An auxiliary tone arm lift and sweep mechanism is controlled by a digital logic system connected to the electro-optic scanner to drive the tone arm across various bands which the user does not want to be reproduced. The logic system includes a programmable memory which stores the preselected sound tracks of a sequence of records which the user intends to be reproduced. A land sensing circuit includes a means for developing a threshold signal which varies with the record surface reflectivity characteristics.