Crosstalk cancellation systems and methods

1. A method for crosstalk cancellation, the method comprising:

receiving a near-end acoustic signal via a microphone and a far-end acoustic signal via a receiver;

generating a cross-talk estimate signal, the generating comprising:

delaying the far-end acoustic signal;

filtering the delayed far-end acoustic signal to produce a filter output, the filtering based at least in part on fixed predetermined filter coefficients, the delayed far-end acoustic signal being in the time domain;

adapting a gain variable for estimating cross-talk, the adapting the gain variable comprising dividing a cross-correlation by a magnitude of filter outputs, the cross-correlation being based at least in part on the near-end acoustic signal and the filter output;

applying a gain to the filter output to produce the cross-talk estimate signal, the gain based at least in part on the adapted gain variable; and

subtracting the cross-talk estimate signal from the near-end acoustic signal to generate a cleaned acoustic signal.

2. The method of claim 1 , wherein adapting the gain variable further comprises:

calculating an echo return loss enhancement (ERLE) based at least in part on a cross-correlation, the near-end acoustic signal, and the filter output; and

calculating the gain variable using the cross-correlation and the filter output if the ERLE is greater than a predetermined minimum threshold established for gain adaptation and the cross-correlation is greater than zero.

3. The method of claim 2 , wherein the cross-correlation is a cross product of a vector of the near-end acoustic signal and a vector of the filter output.

4. The method of claim 2 , wherein the ERLE is a magnitude squared of the near-end acoustic signal multiplied by an inverse of the cross-correlation squared, divided by a magnitude squared of the filter output, subtracted from a magnitude squared of the near-end acoustic signal.

5. The method of claim 2 , wherein the gain variable is equal to the cross-correlation divided by a magnitude squared of the filter output.

6. The method of claim 2 , further comprising preventing divergence of the gain variable by:

placing a predetermined upper bound on the gain variable;

setting a state value to a predetermined non-zero value in response to adapting the gain variable; and

providing the cleaned acoustic signal to an output instead of the near-end acoustic signal unless a state variable has a non-zero value.

7. The method of claim 6 , wherein the state variable is set to zero in response to a magnitude squared of a cleaned acoustic signal vector subtracted from a magnitude squared of a near-end acoustic signal vector being less than a threshold value.

8. A system for reducing crosstalk, the system comprising:

a memory to store executable instructions;

a microphone to transduce a near-end acoustic signal;

a receiver to receive a far-end acoustic signal;

a delay element to delay the far-end acoustic signal by a predetermined delay;

a filter to receive the delayed far-end acoustic signal and generate a filter output based on fixed predetermined filter coefficients, the delayed far-end acoustic signal being in the time domain;

a gain control module that executes the executable instructions stored in the memory to apply an adapted gain to the filter output to produce a cross-talk estimate signal, the adapted gain being based at least in part on dividing a cross-correlation by a magnitude of filter outputs, the cross-correlation being based at least in part on the near-end acoustic signal and the filter output, the cross-talk estimate signal being a scaled filter output;

an adder configured to subtract the cross-talk estimate signal from the near-end acoustic signal to generate a cleaned acoustic signal; and

a switch to selectively output the near-end acoustic signal or the cleaned output signal.

9. The system of claim 8 , wherein the filter comprises an n-tap finite impulse response (FIR) filter.

10. A method for reducing crosstalk, the method comprising:

delaying a far-end acoustic signal by a predetermined delay; and

subtracting a crosstalk estimate value for the delayed far-end acoustic signal from an input acoustic signal, wherein the crosstalk estimate value is a scaled version of filter outputs generated by a finite impulse response filter that utilizes fixed predetermined filter coefficients, the filter outputs being scaled using an adaptable gain value, the delayed far-end acoustic signal being in the time domain, the adaptable gain value being based at least in part on a cross-correlation divided by a magnitude of filter outputs, the cross-correlation being based at least in part on the input acoustic signal and filter output.