Road surface characterization based upon filter coefficients

A system, comprising:

• a filter coefficient monitoring module that is configured to receive a first set of filter coefficient data from a noise cancellation module;
• a road surface profile module that is configured to:
• receive an input representing a road surface type and generate a road surface profile based upon the road surface type and the first set of filter coefficient data;
• store the road surface profile including a correspondence between the road surface type and the first set of filter coefficient data;
• and
• perform a matrix calculation on the first set of filter coefficient data to represent the road surface profile;
• and
• a road surface determination module that is configured to:
• receive a second set of filter coefficient data and determine the road surface type based upon the second set of filter coefficient data, the second set of filter coefficient data different from the first set of filter coefficient data;
• and
• access a look-up table, provide the second set of filter coefficient data to the look-up table, and receive the road surface type from the look-up table.

A method, comprising:

• receiving a second set of filter coefficient data;
• retrieving a road surface profile based upon the second set of filter coefficient data, the road surface profile including a road surface type that corresponds to a first set of filter coefficient data;
• determining the road surface type based upon the second set of filter coefficient data, the second set of filter coefficient data different from the first set of filter coefficient data;
• accessing a look-up table, providing the second set of filter coefficient data to the look-up table, and receiving the road surface type from the look-up table;
• and
• performing a matrix calculation on the first set of filter coefficient data to represent the road surface profile.

A method for detecting a road profile in a vehicle, comprising:

• performing noise cancellation using a plurality of taps with a plurality of filter coefficients, respectively;
• adjusting values of the plurality of filter coefficients during operation of the vehicle;
• and
• determining a road surface type based on the plurality of filter coefficients.