Muting device

Details Muting device Muting device

1981-06-19

1983-08-02

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360 61, G11B 1504, G11B 1512

Patent

active

043969550

ABSTRACT:
In a recording apparatus for performing magnetic recording onto different parts of a magnetic recording medium as it runs in sequence, a switching element is connected in series in a signal path to a magnetic head which is connected to the output of the signal amplifier and to a bias oscillator. Accordingly, the signal current flowing to the magnetic head can be interrupted. A delay circuit is provided for controlling the operation of the switching element so as to defer initiation of the signal current flow to the magnetic head. This is done pending attainment of the speed of movement of the magnetic recording medium to a substantially constant level after the magnetic recording starts. Connected in parallel to the switching element is a by-pass circuit of which the impedance is relatively low at a frequency equal to that of the bias supplied to the magnetic head. A stabilized muting effect from the low to the high sound region thus can be produced.

REFERENCES:
patent: 3721774 (1973-03-01), Yonemoro et al.
patent: 4090224 (1978-05-01), Sato
patent: 4263626 (1981-04-01), Kobayashi

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