Tape recording apparatus provided with a bias control device

Details Tape recording apparatus provided with a bias control device Tape recording apparatus provided with a bias control device

1985-04-18

1986-10-07

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 503

Patent

active

046162739

ABSTRACT:
The magnetic tape recording apparatus includes an erasing head for demagnetizing a magnetic tape, a recording head for recording an input recording tape on the magnetic tape, an oscillator generating an erasing A.C. signal the amplitude of which is changed in accordance with the kind of the magnetic tape, an amplitude limitter receiving the erasing A.C. signal to produce a constant A.C. signal irrespective of the kind of the magnetic tape, a gain-controlled amplifier amplifying the constant A.C. signal with a gain controlled with a gain control signal to obtain a A.C. bias signal, an adder adding the A.C. bias signal with the input recording signal to apply the added signal to the recording head, and a means for obtaining said gain control signal from the added signal. The gain control signal obtaining means may include a low-pass filter receiving the added signal, a peak-detector converting the output from the low-pass filter to a D.C. signal, and a comparator comparing the D.C. signal with a reference voltage to obtain the gain control signal.

REFERENCES:
patent: 3838452 (1974-09-01), Royce
patent: 4438466 (1984-03-01), Falkes et al.
patent: 4454548 (1984-06-01), Jensen
patent: 4470084 (1984-09-01), Bingaman

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