System for protection against copying on magnetic tape...

Details System for protection against copying on magnetic tape... System for protection against copying on magnetic tape...

2005-03-23

2008-12-30

Feild, Joseph H. (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

C369S047120, C380S237000, C726S026000

Reexamination Certificate

active

07471479

ABSTRACT:
An audio or other programme signal is modified to provide protection against copying on a magnetic tape recorder. The signal from a source (10) is amplified (16) and then subjected to Fourier analysis (11) to determine the signal amplitude in a plurality of subbands across the audible range. The subband containing the component of greatest magnitude is selected on an adaptive basis and applied to a stored psycho-sensorial model (12), which determines the maximum amplitude of interference which can be masked by the selected subband. An anti-copy signal is generated (14) by complex division of the desired interference by a stored representation of the response of a tape recorder (13).

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Translation of DE 3806411.
Translation of DE 3806411 A1.
Translation of DE 3806411 A1 (Jun. 2006).
United Kingdom Patent Office Search Report dated Nov. 22, 1999.

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