The distortion of audio signal associated with watermarking has received little attention.We have obtained some distortion laws in this paper.When a certain alternative coefficient is modified in DCT(Discrete Cosine Transform) domain

the law of audio amplitude distortion meets the cosine curve after inverse DCT.For the DWT(Discrete Wavelet Transform) domain audio watermarking

the distortion of audio signal shows the shape of scaling function after inverse DWT if a certain approximation coefficient in DWT domain is justified.Furthermore

analysis on embedding watermark in DWT-DCT domain is performed.By derivations and experiments

we draw the conclusions that the relationships between the variation of sample value and that of the low frequency coefficients in DCT

that of the approximation coefficient in DWT

and that of the low frequency coefficient in hybrid domain

are linear respectively.Our conclusions are helpful to find the discontinuities due to embedding watermark

which may cause audible noise

and improve the efficiency of embedding watermark.