FIELD: protective devices.
SUBSTANCE: invention relates to means for generating, decoding and encoding a watermark. Watermark generator for generating, based on binary data messages of a digital watermark includes a processor of information generated on the basis of information data units of a binary message a first time-frequency representation, where values represent binary data messages; a differential encoder, formed on the basis of first time-frequency representation of a second time-frequency representation comprising a plurality of values, where the difference between the two values expresses a value of first time-frequency representation, to perform differential (difference) coding of values of first time-frequency representation. Water mark generator also includes a watermark signal provider configured to provide a watermark signal based on second time-frequency representation.
EFFECT: technical result is to increase reliability in event of exposure of watermark signal to Doppler frequency.
23 cl, 43 dwg
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