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Codierer zur Einbringung eines nicht hoerbaren Datensignals in ein Audiosignal und Decodierer zum decodieren eines nicht hoerbar in einem Audiosignal enthaltenen Datensignals

Coding method with insertion of inaudible data signal into audio signal - converting audio signal into spectral range and producing pseudonoise signal and multiplying it by data signal, before weighting spread data signal with masking threshold.

Frontpage ()

DE 1996-19608926 A: 19960307
DE 1996-19640814 A: 19961002
DE 1996-19640825 A: 19961002
EP 1997-902223 AW: 19970124
WO 1997-EP338 A: 19970124
DE 19640814 C2: 19980723
DE 19640825 C2: 19980723
EP 875107 B1: 19990901
Patent, Electronic Publication
Fraunhofer IIS A ( IIS) ()

The method involves transforming the audio signals to a spectral range and determining a masking threshold (W( omega )) for the audio signals. The method also provides pseudorandom noise signals and data signals. The pseudorandom noise signals are multiplied with the data signals in order to evenly spread the data signal over a frequency range. The spread data signal is then weighted with the masking threshold and overlaid with the audio signals. Preferably when transforming the audio signals the method uses a fast fourier transform. USE/ADVANTAGE - E.g. for spread spectrum communication system. Reduces interference and multipath propagation.