Proximity compensation for remote microphone ANC algorithm

1. A remote microphone system for a vehicle comprising:

at least one physical microphone arranged within a vehicle cabin configured to generate an error signal at a virtual microphone location within the vehicle;

a database configured to maintain a look up table of premeasured seat positions and associated transfer functions;

a processor configured to

receive a seat position indicative of a seat location within the vehicle;

determine whether one of the premeasured positions correspond to the seat position;

in response to one of the premeasured positions not corresponding to the seat position, interpolate the transfer function from at least two known premeasured positions; and

apply the transfer function interpolated from the at least two known premeasured positions to a primary noise signal of the at least one physical microphone to generate the error signal.

2. The system of claim 1 , wherein the transfer function includes filter coefficients specific to the seat position.

3. The system of claim 2 , wherein the filter coefficients are determined at least in part by a least mean square (LMS) optimization routing.

4. The system of claim 1 , wherein the transfer function is linearly dependent on the primary noise signal.

5. The system of claim 1 , wherein the primary noise signal is generated based on a source signal at the physical microphone and an antinoise signal.

6. The system of claim 1 , wherein the virtual microphone location includes two virtual microphone locations, one at each side of the seat.

7. A remote microphone system for estimating an error signal for noise cancelation within a vehicle comprising:

at least one physical microphone arranged within a vehicle cabin configured to generate an error signal at a virtual microphone location within the vehicle at a vehicle seat;

a database configured to maintain a look up table of premeasured seat positions and associated transfer functions;

a processor configured to

receive a seat position of the vehicle seat;

determine whether one of the premeasured seat positions correspond to the seat position;

in response to one of the premeasured positions not corresponding to the seat position, interpolate the transfer function from at least two known premeasured positions; and

apply the transfer function interpolated from the last two known seat positions to a primary noise signal of the at least one physical microphone to generate the error signal.

8. The system of claim 7 , wherein the transfer function includes filter coefficients specific to the seat position.

9. The system of claim 8 , wherein the filter coefficients are determined at least in part by a least mean square (LMS) optimization routing.

10. The system of claim 7 , wherein the transfer function is linearly dependent on the primary noise signal.

11. The system of claim 7 , wherein the primary noise signal is generated based on a source signal at the physical microphone and an antinoise signal.

12. The system of claim 7 , wherein the virtual microphone location includes two virtual microphone locations, one at each side of the seat.

13. A method for estimating an error signal for a virtual microphone for noise cancelation within a vehicle comprising:

receiving a seat position of a vehicle seat;

determining whether the seat position corresponds to a premeasured seat position;

in response to the seat position not corresponding to the premeasured seat position, interpolating the transfer function from at least two known premeasured positions; and

applying a transfer function associated with the seat position to a primary noise signal of at least one physical microphone to generate an error signal.