FIELD: methods and devices for additional data insertion in and extraction from audio signals.
SUBSTANCE: proposed procedure for inserting additional data such as watermarks in audio signals and extracting them from compressed audio signal involves separation of audio signal during insertion of additional data into frames, generation of set of prediction filtration factor for each frame, prediction coding of each frame using mentioned coefficients, and for inserting additional data at least one of chosen filtration factors is adjusted to equal value of these additional data. In this way any impact on bit transfer speed is made absolutely impossible.
EFFECT: provision for reading additional data without decoding entire audio signal or impairing quality of music.
7 cl, 3 dwg, 3 tbl
