Audio copy protection system

G - Physics – 11 – B

Patent

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Details

G11B 20/00 (2006.01) H04H 60/04 (2009.01) H04N 21/835 (2011.01) G06F 21/00 (2006.01) H04N 5/913 (2006.01)

Patent

CA 2584219

An apparatus for applying an anti-copy protection signal for use with switchable head recorders, such as Video Hi-FI recorders, is described. A high frequency pulsed signal is added to an original signal. The pulses interfere with the compensator circuitry such that the switching of the record head cannot adequately be masked on recording of a signal. On playback, the switching of the recording heads can subsequently be heard. In Video Hi-Fi recorders, the effect of the high frequency signals also interferes with the compressor-expander circuits to worsen the sound of the head switching.

La présente invention se rapporte à un appareil conçu pour appliquer un signal de protection contre les copies pouvant être utilisé avec des enregistreurs à têtes commutables, tels que des enregistreurs haute-fidélité. Un signal pulsé à haute fréquence est ajouté à un signal original. Les impulsions créent des interférences avec les circuits de compensation de sorte que la commutation de la tête d'enregistrement ne peut pas être masquée de manière adéquate lors de l'enregistrement d'un signal. Au moment de la lecture, la commutation des têtes d'enregistrement peut être entendue subséquemment. Dans les enregistreurs Vidéo haute-fidélité, l'effet des signaux haute fréquence perturbe également les circuits de compression-expansion afin d'aggraver le son de la commutation des têtes.

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