Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1979-05-23
1981-07-14
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
360 31, 360 65, G11B 547, G11B 545, G11B 7736
Patent
active
042790050
ABSTRACT:
In order to compensate for differences in magnetic properties of recording tapes, a first and second audio test signals of different frequencies are generated by a variable frequency test signal source, recorded on a magnetic tape and reproduced to represent the magnetic properties of the tape at the different frequencies. The reproduced first test signal is stored in a microcomputer for comparison with the level of the subsequently reproduced second test signal to detect the difference therebetween for making an adjustment of the level of the second test signal in accordance with the detected difference through the use of a level adjusting device. The latter is thereafter held adjusted to the value at which the two test signals have an equal level of reproduction.
REFERENCES:
patent: 4011585 (1977-03-01), Sunaga
patent: 4037259 (1977-07-01), Hammon et al.
patent: 4038692 (1977-07-01), Umeda et al.
patent: 4092678 (1978-05-01), Nishikzwa
Technical Information Brochure #4 by Clarence Stanley, Ampex Corp., Mar. 15, 1958, pp. 1-8.
Kitamura Masatsugu
Onoye Hideo
Yamazaki Masami
Canney Vincent P.
Victor Company of Japan , Limited
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