Magnetic recording system with signal-controlled bias and equali

Details Magnetic recording system with signal-controlled bias and equali Magnetic recording system with signal-controlled bias and equali

1980-08-11

1982-10-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 66, G11B 545, G11B 547

Patent

active

043531008

ABSTRACT:
A stereophonic magnetic tape recording system having a pair of magnetic recording heads each provided with its own signal processing circuit including amplifiers, an equalizer, etc. Shared by both channels, a bias oscillator feeds a bias current, having a frequency higher than the spectrum of the information signals to be recorded, to both record heads. For continuously adapting the recording bias and equalization to the high frequency portions of the information signals, each channel is further provided with a variable impedance circuit connected in parallel with one of the record heads, and a control circuit for varying the impedance of the variable impedance circuit as dictated by the high frequency portion of the corresponding information signal. A decrease in the impedance of each variable impedance circuit results in the reduction of the bias current fed to the corresponding recording head and of the high frequency level of the information signal; conversely, an increase in the impedance of the variable impedance circuit results in an increase in the bias current and in the high frequency level of the information signal.

REFERENCES:
patent: 4220979 (1980-09-01), Kitamura et al.
patent: 4263624 (1981-04-01), Gundry
patent: 4279005 (1981-07-01), Kitamura et al.
"Headroom Extension for Slow Speed Magnetic Recording of Audio"--Kenneth Gundry.

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