Magnetic recording/reproducing method and apparatus

Dynamic magnetic information storage or retrieval – Converting an analog signal to digital form for recording;...

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360 191, G11B 509

Patent

active

051895641

ABSTRACT:
In an information recording/reproducing apparatus for recording/reproducing a digital audio signal on/from a magnetic medium, a modulator/demodulator for modulating/demodulating the digital signal by offset quadrature phrase shift keying (O-QPSK). This technique is particularly applicable to the multi-layer recording of video and audio signals in a video tape recording/reproducing system and has the advantage of avoiding interference between the recorded digital audio and video signals at the time of reproduction.

REFERENCES:
patent: 4281412 (1981-07-01), Wissel et al.
patent: 4501002 (1985-02-01), Auchtorlonie
patent: 4596022 (1986-06-01), Stoner
patent: 4613976 (1986-09-01), Serverinson et al.
patent: 4758903 (1988-07-01), Noguchi
Miura et al. IEEE Transactions on Consumer Electronics "HiFi VCR System" vol. CE-30 No. 3 Aug. 1984 pp. 360-368.

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