Biasing and erasing apparatus and method for magnetic tape recor

Details Biasing and erasing apparatus and method for magnetic tape recor Biasing and erasing apparatus and method for magnetic tape recor

1992-06-15

1994-06-14

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 68, G11B 503, G11B 502

Patent

active

053215630

ABSTRACT:
A circuit for generating a bias signal and an erase signal for use in a recording apparatus having a record head for recording an input analog signal on a magnetic tape, and an erase head for erasing information from the tape. A DC erase signal is applied to the erase head in response to the erase control signal to cause the erase head to erase information. An AC bias signal is generated and is combined with the input analog signal to make a record signal. The record signal is applied to the record head in response to the record control signal to record information on the tape. A controller generates an erase control signal and as record control signal. The AC bias signal is generated by an AC bias oscillator, such as a Hartley oscillator to reduce the noise contributed in the recording system. Use of a DC source to drive the erase head reduces the cost of the circuit, while maintaining a significant increase in the signal-to-noise ratio.

REFERENCES:
patent: 3947642 (1976-03-01), Mayerle
patent: 4504874 (1985-03-01), Imai
patent: 4616273 (1986-10-01), Ishii et al.
patent: 4837644 (1989-06-01), Yunoki
Snader, Earl E. Bias Oscillator Circuits Radio-Electronics, Jul. 1962.
Semiconductors, Transistors and Circuits, Buchsbaum, Sc.D., pp. 201-205, Buchsbaum's Complete Handbook of Practical Electronic Reference Data, Second Edition.
PCT Notification of Transmittal of the International Search Report or the Declaration, (Sep. 29, 1993), pp. 1-9.

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