Audio sonic watermarking algorithm based on double DCT transform

Based on double DCT transform, an audio sonic watermarking algorithm was proposed. After the first DCT transform, coefficients of low frequency were chosen for the second DCT transform. Though the method of modifying the coefficients of double DCT transform domain, the watermarking was embedded with large capacity. Experimental results indicate that the proposed algorithm has good hidden effect, and it is very robust to 30% resample and MP3 compression attacks, and to a variety of other distortions in Stirmark Benchmark for Audio.