Recording and reproducing apparatus with limited digital copying

Details Recording and reproducing apparatus with limited digital copying Recording and reproducing apparatus with limited digital copying

1990-12-26

1993-07-27

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360 27, G11B 1504, G11B 502

Patent

active

052315460

ABSTRACT:
A composite digital signal received by a recording and reproducing apparatus includes a digital information signal and a control signal. The control signal represents a number of digital copy generation of the associated information signal. The information signal of the received digital composite signal is recorded into recording medium. The information signal is reproduced from the recording medium. During the reproduction of the information signal, a new control signal is generated which represents a number equal to one plus the number represented by the control signal of the received composite digital signal. The new control signal and the reproduced information signal are combined into a new composite digital signal. The new composite digital signal is outputted. A check is made as to whether or not the number represented by the control signal of the received composite digital signal is equal to a predetermined number. When the number represented by the control signal of the received composite digital signal is equal to the predetermined number, the recording of the information signal of the received composite digital signal is inhibited.

REFERENCES:
patent: 4550350 (1985-10-01), Billings
patent: 4652941 (1987-03-01), Pfannkuch
patent: 4937679 (1990-06-01), Ryan
"Digital Audio Interface", p. 11, Sep. 1987, EIAJ, Engineering Department.

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