Dynamic magnetic information storage or retrieval – Head – Core
Patent
1974-12-19
1977-01-11
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Head
Core
1791001PS, 360 12, 360 79, G11B 3100
Patent
active
040028585
ABSTRACT:
A continuous primary audio program is periodically interrupted and a programmable source having a secondary program is periodically operated by an automatic electrical control in response to a control signal having a frequency outside of the audio frequency range and supplied by the secondary source. A sensing circuit selectively operates as a resonant amplifier and responds to the control signal to de-activate the secondary program and reinstate the primary program while further initiating a timing sequence by a timing circuit. Cyclic operation is provided by the timing circuit which functions to operatively attenuate the primary program and operate the secondary program after a predetermined duration of time following the control signal. Common circuitry is employed to program the secondary source by converting the resonant amplifier to an oscillator which operates with a selectively supplied source signal of a predetermined duration to provide an oscillatory output supplying the control signal to the secondary source.
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patent: 3644682 (1972-02-01), Parilla
patent: 3775569 (1973-11-01), Lougeay et al.
patent: 3825947 (1974-07-01), Rubin et al.
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