METHOD AND DEVICE FOR INTRODUCING WATERMARK INTO AUDIO SIGNAL Russian patent published in 2021 - IPC G10L19/18 H04N19/467 

FIELD: electronics.

SUBSTANCE: invention relates to electronics and, in particular, to the use of a special analog signal, a watermark (WM), for the protection and identification of copyright for a genuine, legal audio signal. A device for introducing a watermark into an audio signal obtained from an audio signal source has a noise generator with equal spectral power density of a noise signal, an amplifier with a variable gain, a generated noise level meter configured to measure the level at the output of the noise generator and including a frequency filter with a bandwidth an audio signal having analog input and output; an amplitude detector for determining the level of generated noise, having an analog input and output; an audio signal source level meter configured to measure the level at the output of an audio signal source and including a frequency filter with an audio signal frequency band having analog input and output, an amplitude detector for determining the level of an audio signal source, an audio signal detector against a background of natural noise, including a level meter for an audio signal source, a threshold device with an analog input and a control output; a comparison device having first and second analog inputs and outputs; the first controlled key, the second key, the third controlled key, an adder.

EFFECT: increased secrecy of the embedded WM in the audio signal.

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