Methods of and information recording devices for recording and/o

Details Methods of and information recording devices for recording and/o Methods of and information recording devices for recording and/o

1994-08-16

1995-09-26

Epps, Georgia Y.

Dynamic information storage or retrieval

Duplication or copying

369 48, 369 53, 360 60, 380 4, G11B 509, G11B 364

Patent

active

054539684

ABSTRACT:
Methods of and information recording devices for recording and/or inhibiting recording of a signal including copy bits on a record carrier, and a record carrier including that signal. The signal has successive information frames including main data and subcode data. The subcode data of the information frames make up successive subcode frames having copy bits with logic values which alternate among the subcode frames in accordance with a predetermined pattern. Each subcode frame has at least one copy bit. In one of the embodiments, the signal is received and a determination is made whether to inhibit its recording on the basis of the predetermined pattern exhibited by the logic values of the copy bits contained in the subcode frames. In another embodiment the subcode frames are replaced by substitute subcode frames having copy bits with logic values which alternate among the substitute subcode frames in accordance with a selected pattern prior to recording of the signal. The predetermined and selected patterns are indicative of a particular characteristic of the main data (e.g., whether the main data is copy protected).

REFERENCES:
patent: 4528588 (1985-07-01), Lofberg
patent: 4682317 (1987-07-01), Tomisawa
patent: 4775901 (1988-10-01), Nakano
patent: 4849836 (1989-07-01), Kachikian
patent: 5231546 (1993-07-01), Shimada et al.
CEI-IEC 958 International Electrotechnical Commission, "Digital Audio Interface", pp. 3-49.

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