Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Reexamination Certificate
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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Abdin Abdul-Hamed Mazen
Tan Baolin
Dwight Cavendish Systems Limited
Feild Joseph H.
Flynn ,Thiel, Boutell & Tanis, P.C.
Negron Daniell L
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