Programmable record changer

Details Programmable record changer Programmable record changer

1976-04-30

1978-06-06

Konick, Bernard

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

1791004A, 1791003V, 250214B, 250570, 360 72, 274 15R, 307358, 274 23R, G11B 1914

Patent

active

040938328

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.

REFERENCES:
patent: 2952464 (1960-09-01), Stimler
patent: 3368080 (1968-02-01), Nakagiri
patent: 3429580 (1969-02-01), Hammond
patent: 3661397 (1972-05-01), Worth
patent: 3867628 (1975-02-01), Brown
patent: 3937903 (1976-02-01), Osann

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