Patent ID: 8099285

Claim:
A system for identifying audio data comprising: a transform system for receiving left channel audio data and right channel audio data and electronically generating a plurality of frequency bins of left channel magnitude data, left channel phase data, right channel magnitude data and right channel phase data; a watermarking system for receiving watermarking data and electronically modifying predetermined frequency bins of the left channel phase data and the right channel phase data to encode the watermarking data; a magnitude system for receiving the left channel magnitude data and the right channel magnitude data and increasing the left channel magnitude data and the right channel magnitude data for one or more of the predetermined frequency bins to a threshold level if the left channel magnitude data and the right channel magnitude data for the corresponding frequency bin are less than the threshold level; and a timing system for receiving a plurality of bits of timing data and modifying two or more predetermined frequency bins of the left channel phase data and two or more predetermined frequency bins of the right channel phase data to encode each bit of the timing data; wherein the predetermined frequency bins of the left channel phase data and the right channel phase data that are used to encode timing data are modified by different phase angles than the predetermined frequency bins of the left channel phase data and the right channel phase data that are used to encode watermarking data.