Signal identification system

Details Signal identification system Signal identification system

1989-10-25

1992-05-12

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 19, 360 60, G11B 2328

Patent

active

051134373

ABSTRACT:
A signal identification system, suitable for producing an identification code on a sound track recording is described. The system includes an encoder 209 effective to eliminate a variable sequence of frequency bands from an audio signal and insert a sequence of code signals into the frequency bands. As the sequence of frequency bands varies throughout the sound track recording, the presence of the code is difficult to detect.

REFERENCES:
patent: 4156205 (1979-05-01), Kadin et al.
patent: 4325089 (1982-04-01), Hsu
patent: 4802212 (1989-01-01), Freeman
patent: 4876617 (1989-10-01), Best et al.

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