Linear full duplex system and method for acoustic echo cancellation

A machine-readable medium embodying a set of instructions that, when executed by a machine, causes the machine to:

• calculate, via an echo estimation module, an echo estimate of an echo due to a far end signal associated with a communication;
• obtain a residual echo by subtracting, via an echo subtraction module, the echo estimate from a near end signal associated with the communication;
• decorrelate, using a decorrelation module, the far end signal and the residual echo, wherein output of the decorrelation module is used for adaptations of an adaptive filter module;
• detect and manage, via a dual double talk detector, double talk associated with the communication, the step of detecting and managing comprising:
• computing, via a power based detector, a maximum power of the far end signal over a double talk detection window;
• and
• computing, via a correlation based detector, correlation between the echo estimate from the echo estimation module and the near end signal and between the residual echo and the near end signal;
• determine, via an acoustic echo canceller controller state machine, presence of the double talk based on the computed power and the computed correlations;
• and
• provide status information associated with the double talk to the acoustic echo canceller controller state machine.

A system, comprising:

• an echo estimation module to calculate an echo estimate of an echo due to a far end signal associated with a communication;
• an echo subtraction module to obtain a residual echo by subtracting the echo estimate from a near end signal associated with the communication;
• a decorrelation module to decorrelate the far end signal and the residual echo;
• an adaptive filter module to receive output of the decorrelation module for performing adaptations of the adaptive filter module;
• a dual double talk detector to detect and manage double talk associated with the communication, wherein the dual double talk detector comprises:
• a power based detector to compute a maximum power of the far end signal over a double talk detection window;
• and
• a correlation based detector to compute correlation between the echo estimate from the echo estimation module and the near end signal and between the residual echo and the near end signal;
• and
• an acoustic echo canceller controller state machine to determine presence of the double talk based on the computed power and the computed correlations and to receive status information associated with the double talk.