Apparatus for marking a recorded signal

Details Apparatus for marking a recorded signal Apparatus for marking a recorded signal

1989-04-20

1990-10-16

Shoop, Jr., William M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

455109, G11B 1504

Patent

active

049639986

ABSTRACT:
This invention relates to apparatus for marking a recorded signal. The apparatus includes means for generating and storing a marking signal comprising at least two codes which are mutually in phase quadrature. The codes are converted to analogue signal and are used to phase-shift modulate the signal to be recorded, the modulating means performing the function of a single side band modulator on the signal to be recorded.

REFERENCES:
patent: 4086634 (1978-04-01), Cook
patent: 4100575 (1978-07-01), Morio et al.
patent: 4528588 (1985-07-01), Lofberg
patent: 4578722 (1986-03-01), Lovgren et al.
patent: 4581766 (1986-04-01), Parker
patent: 4644422 (1987-02-01), Bedini
Lathi, "Modern Digital and Analog Comm. Systems," 1983, pp. 234-244.

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