WATERMARK GENERATOR, WATERMARK DECODER, METHOD OF GENERATING WATERMARK SIGNAL BASED ON BINARY MESSAGE DATA, METHOD OF GENERATING BINARY MESSAGE DATA BASED ON A SIGNAL WITH WATERMARK AND COMPUTER PROGRAM USING DIFFERENTIAL CODING

摘要

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