Patent ID: 7231271

Claim:
In the field of audio communication, a steganographic method for embedding data, comprising the steps of: a first step of inputting a digital host audio signal; dividing said host audio signal into non-overlapping frames; computing the frame power f e ; a second step of inputting a digital signal to be embedded; determining whether a “0” is to be embedded; IF a “0” is to be embedded; THEN setting the power of a tone at f 0 to a percentage of the power of f e ; setting the power of a tone at f 1 to a fraction of the power of said tone at f 0 ; embedding said tone at f 0 and said tone at f 1 into said frame of said host audio signal; transmitting said frame of said host audio signal; inputting next frame of said host audio signal and next bit of said digital signal to be embedded; and returning to said step of determining; OTHERWISE; setting the power of a tone at f 1 to a percentage of the power of f e ; setting the power of a tone at f 0 to a fraction of the power of said tone at f 1 ; and returning to said step of embedding.