Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1976-12-16
1978-05-30
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 66, G11B 2736, G11B 547
Patent
active
040926788
ABSTRACT:
A first signal of a relatively high frequency and second signal of a relatively low frequency are alternately generated, the amplitudes of these signals varying with time. Then the first and second signals are recorded, together with a predetermined bias signal, on a magnetic recording medium by a tape recorder, and thereafter the thus recorded first and second signals are reproduced. Subsequently, detection is made of a point of time when the third harmonic component of the reproduced second signal comes to have a predetermined level ratio with respect to the reproduced second signal. The level of the reproduced second signal at the point of time to be detected as mentioned above is held, and at the same time the peak level of the reproduced first signal is also held. Thus, the bias for the tape recorder is set up at a required value on the basis of the difference or ratio between the held first and second signals.
REFERENCES:
patent: 3300590 (1967-01-01), Cronin
patent: 3564160 (1971-02-01), Temes et al.
patent: 3704349 (1972-11-01), Goshima et al.
patent: 4011585 (1977-03-01), Sunagz
Canney Vincent P.
Shin-Shirasuna Electric Corp.
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