  A novel diverse domain (DCT-SVD & DWT-SVD) watermarking scheme is proposed in
this paper. Here, the watermark is embedded simultaneously onto the two
domains. It is shown that an audio signal watermarked using this scheme has
better subjective and objective quality when compared with other watermarking
schemes. Also proposed are two novel watermark detection algorithms viz., AOT
(Adaptively Optimised Threshold) and AOTx (AOT eXtended). The fundamental idea
behind both is finding an optimum threshold for detecting a known character
embedded along with the actual watermarks in a known location, with the
constraint that the Bit Error Rate (BER) is minimum. This optimum threshold is
used for detecting the other characters in the watermarks. This approach is
shown to make the watermarking scheme less susceptible to various signal
processing attacks, thus making the watermarks more robust.
