Low-noise preamplifier

Details Low-noise preamplifier Low-noise preamplifier

1979-06-28

1981-03-10

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 67, G11B 545, G11B 502

Patent

active

042557690

ABSTRACT:
The preamplifier comprises amplifying means, the output of which is inverted relative to the input, and a feedback circuit connected from the output to the input of the amplifier so as to provide a perfect integrator which cancels the amplitude variations resulting from changes in tape speed. The impedance of the feedback circuit and the impedance of the signal source extended to the amplifier are such that the output of the amplifier is the integral of the voltage generated in the inductive head over a wide band of frequencies.

REFERENCES:
patent: 3934267 (1976-01-01), Kosaka et al.
patent: 4041538 (1977-08-01), Parker
patent: 4110798 (1978-08-01), Miller et al.
patent: 4134140 (1979-01-01), Wright et al.
patent: 4157574 (1979-06-01), Stamer
"Low Noise Reproducing Preamplifier for Professional Audio Recorders," _Zolton Vajda, Journal of Audio Engr'. Soc., vol. 23, #1, Jan.-Feb. 1975.
"Improvements of the Noise Characteristics of Amplifiers for Magnetic Transducers," Hoettolmen et al., Jour. of the Audio Eng'r. Soc., vol. 26, #12, 12/78.

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