Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1990-10-03
1992-07-14
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360 32, G11B 509
Patent
active
051308649
ABSTRACT:
The invention includes an A/D converter, a digital input, decoder for demodulating a signal supplied to a digital input terminal to decode it into respective blocks of data, a digital copy control signal detecting portion for detecting a digital copy control signal from a channel status signal in an output signal of the digital input decoder, a digital copy permissibility decision portion for deciding whether digital copying is permissible or not, according to an output of the digital copy control signal detecting portion, a recording signal selecting portion for selecting one of an output signal of the A/D converter and an output signal of the digital input decoder and supplying the selected signal to a recording signal processing circuit, a first selection switch for selecting one of an output signal of a reproduced signal processing circuit and an output signal of the digital input decoder and supplying the selected signal to a D/A converter, and a second selection switch for selecting one of an output signal of the D/A converter and a signal supplied to an analog signal input terminal and supplying the selected signal to the A/D converter, whereby even in the digital recording mode, when the digital copying permissibility decision portion decides that digital copying is impermissible, the recording signal selecting portion selects an output signal of the A/D converter, the first selection switch selects an output signal of the digital input decoder, and the second selection switch selects the output signal of the D/A converter, so that a change is made from the digital recording mode to the analog recording mode, and thus a continuous recording is made.
REFERENCES:
J. Watkinson, "Compact disc mastering," Electronics and Wireless World, vol. 92, No. 1600, pp. 47-62, Feb. 1986.
Canney Vincent P.
Matsushita Electric - Industrial Co., Ltd.
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