Temporally accurate watermarking system and method of operation

A system for identifying audio data comprising:

• a transform system receiving left channel audio data and right channel audio data and 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 phase difference system receiving the left channel phase data and the right channel phase data and generating detected phase difference data based on detected phase differences in predetermined frequency bins of the left channel phase data and the right channel phase data;
• and
• an error estimation system receiving the detected phase difference data and embedded phase difference data and generating an error estimation based on the detected phase difference data and the embedded phase difference data.

A method for identifying audio data comprising:

• receiving left channel audio data and right channel audio data;
• converting the left channel audio data and the right channel audio data into a plurality of bins of left channel phase data, left channel magnitude data, right channel phase data and right channel magnitude data;
• encoding watermark data by modifying a phase difference between the left channel phase data and the right channel phase data for each of a plurality of predetermined bins;
• and
• adjusting the left channel magnitude data and the right channel magnitude data for each of the plurality of predetermined bins to a predetermined threshold if the left channel magnitude data and the right channel magnitude data is less than the predetermined threshold.

A method for identifying audio data comprising:

• receiving left channel audio data and right channel audio data;
• converting the left channel audio data and the right channel audio data into a plurality of bins of left channel phase data, left channel magnitude data, right channel phase data and right channel magnitude data;
• detecting timing data by measuring a phase difference between the left channel phase data and the right channel phase data for each of a plurality of predetermined bins;
• and
• generating error data using the detected timing data and predetermined timing data.