Dynamic magnetic information storage or retrieval – Record editing
Patent
1990-12-11
1995-05-09
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Record editing
360 91, 360 66, H04N 578
Patent
active
054145678
ABSTRACT:
A magnetic recording method and apparatus which performs a quadrature phase shift keying operation on a digital information signal, superimposes a high frequency bias signal on the performed signal, records the resulting signal into a deep portion of a magnetic layer of a magnetic tape with a first rotational head, and records a video signal in a surface portion of the magnetic layer above a track formed by the former recording, with a second rotational head which is different in azimuth angle from the first rotational head, the frequency of the high frequency bias signal being set to a value which is about four times as high as the carrier frequency of the quadrature phase shift keyed digital information signal, thereby eliminating a 5th-order distortion component due to cross modulation of the high frequency bias signal and the carrier frequency.
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English Abstract of Japanese Kokai 60-195704 published Oct. 4, 1985.
Abeta Akira
Amada Nobutaka
Arai Takao
Takeuchi Toshifumi
Usuda Kouei
Hitachi , Ltd.
Kapadia Varsha A.
Psitos Aristotelis
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