AUDIO WATERMARKING

摘要

A method of providing a digital watermark in an audio signal comprises selecting a key frequency value determining how watermark information is to be embedded into a first time frame of the audio signal. A plurality of discrete frequency component values of the audio signal is provided for the first time frame. At least two frequency components for the time frame are selected as a function of the key frequency value. The two frequency components are tested to determine if they meet a given mutual criterion for the signal in the first time frame. If the components do not meet the criterion, the magnitude of at least one of the two frequency components is adjusted in the first time frame.