Anti-copying system for audio signals

Details Anti-copying system for audio signals Anti-copying system for audio signals

2005-06-07

2005-06-07

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

With mixer

C380S201000, C360S060000, C381S056000

Reexamination Certificate

active

06904153

ABSTRACT:
In order to protect audio signals against copying, it is proposed to mix the audio signal with at least one non-audible disturbance signal. A first disturbance signal may be a low-frequency signal which is added to the audio signal, while a second disturbance signal may be a high-frequency disturbance signal which is multiplied with the audio signal. Additionally, the second disturbance signal may be modulated by a modulating signal comprising either the original or inverted original signal, or spoken messages indicative of an illegal copy.

REFERENCES:
patent: 4644422 (1987-02-01), Bedini
patent: 4802212 (1989-01-01), Freeman et al.
patent: 5394274 (1995-02-01), Kahn
patent: 0 298 691 (1989-01-01), None
patent: 0 372 601 (1990-06-01), None
patent: 0 392 612 (1990-10-01), None
patent: 0 348 570 (1991-01-01), None

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