Adaptive estimation and compensation of clock drift in acoustic echo cancellers

A method for acoustic echo cancellation clock drift compensation, comprising:

• receiving capture position information;
• receiving render position information, the render position information including a render read pointer;
• calculating a capture delay;
• calculating a render offset;
• calculating a filtered error based, at least in part, upon the equation:
• filtered error=(1−error filter)*filtered error+(error filter*raw error)
• where error filter is a constant and raw error is the difference of a render write pointer and the render read pointer less the render offset;
• and,
• adjusting a render read pointer based, at least in part, upon the raw filtered error.

A computer readable medium storing computer executable components of a system facilitating acoustic echo cancellation clock drift compensation, comprising:

• a clock drift compensator component that calculates a capture delay and a render offset, the clock drift compensator adjusting a render read pointer based, at least in part, upon a filtered error based, at least in part, upon the equation:
• filtered error=(1−error filter)*filtered error+(error filter*raw error)
• where error filter is a constant and raw error is the difference of a render write pointer and the render read pointer less the render offset;
• and,
• an AEC component that performs acoustic echo cancellation of capture data based, at least in part, upon the adjusted render read pointer.

An acoustic echo cancellation clock drift compensation system, comprising:

• means for buffering capture data, the means for buffering capture data having a capture write pointer and a capture read pointer;
• means for buffering render data, the means for buffering render data having a render write pointer and a render read pointer;
• means for compensating clock drift, the means for compensating clock drift calculating a capture delay and a render offset, the means for compensating clock drift adjusting the render read pointer based, at least in part, upon a filtered error based, at least in part, upon the equation:
• filtered error=(1−error filter)*filtered error+(error filter*raw error)
• where error filter is a constant and raw error is the difference of the render write pointer and the render read pointer less the render offset;
• and,
• means for performing acoustic echo cancellation of the capture data, the means for performing acoustic echo cancellation utilizing the adjusted render read pointer.