Recording medium having copying protection signals recorded in s

Details Recording medium having copying protection signals recorded in s Recording medium having copying protection signals recorded in s

1997-04-07

2000-01-04

Hindi, Nabil

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369124, 369 58, H04N 576

Patent

active

060117656

ABSTRACT:
A signal processing apparatus in which an analog signal having a first band is summed to a copying protection signal having a pre-set frequency in a second band sufficiently separated from the first band and the resulting sum signal is converted into a 1-bit digital signal which is then recorded on a recording medium. Therefore, if a user annuls the copying protection on purpose, the sum signal is converted into a multi-bit signal at the time of removing the pre-set frequency, preventing the original 1-bit signal from being copied. Thus it becomes possible to inhibit copying of the 1-bit digital signal in the high-band high-quality state proper to the 1-bit digital signal.

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Patent Abstract of Japan No. 04331517.

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