A coherent multiple frequency estimator and its applications in synthesis-analysis audio watermarking

Summary form only given. The paper extends our previous work on single parameter watermarking to the multiple parameter case. Watermarks are embedded in multiple sinusoidal tracks via frequency quantization index modulation (F-QIM), and extracted by a coherent multiple frequency estimator using Newton´s method. Experiments are conducted subject to MP3 attacks and, in an 8-track sinusoidal synthesis-analysis setup, above bits/sec of data hiding is consistently achieved with error correction. Furthermore, the frequency estimator´s performance is compared against the fundamental limit of the inverse Fisher information.