Sound recording apparatus

Details Sound recording apparatus Sound recording apparatus

1977-05-04

1979-01-02

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

G11B 502

Patent

active

041330102

ABSTRACT:
A sound recording head includes an induction coil. A feedback resistor is connected in series with the induction coil between the input and output of an operational amplifier to form the feedback branch of the amplifier. A load resistor is connected to the junction between the feedback resistor and the induction coil. An audio-frequency audio signal and also a higher-frequency magnetic biasing signal are applied to the operational amplifier input. The open-loop gain of the operational amplifier is at least one order of magnitude greater than the gain of the amplifier with the aforementioned feedback branch connected thereto. The resistance of the feedback resistor is at least one order of magnitude greater than the impedance of the induction coil at the frequency of the magnetic biasing signal. The resistance of the load resistor is at least one order of magnitude smaller than the impedance of the induction coil at the frequency of the magnetic biasing signal.

REFERENCES:
patent: 3530257 (1970-09-01), Brown, Jr.
patent: 3806828 (1974-04-01), Johnson
"Record Current Driver for Battery Operated Recorder"-Higgin-Botham et al.; IBM TDB, vol. 18, #11, Apr. 1976.
"Design of Mag. Recording & Playback Amplifiers"-Sah et al.; IEE-Terg Proceedings-India, vol. 13, #2, pp. 39-46, Mar./Apr. 1975.

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