Periodic signal enhancement system

A signal enhancement system comprising:

• means for receiving an input signal;
• means for delaying the input signal by multiple different delays;
• means for partitioned adaptive filtering the input signal based on the multiple different delays;
• and
• means for reinforcing the input signal with a partitioned adaptive filtering output.

A signal enhancement system comprising:

• a signal input;
• an M1 sample delay coupled to the signal input;
• an M2 sample delay coupled to the M1 sample delay;
• a first adaptive filter coupled to the M1 sample delay and comprising a first filter output;
• a second adaptive filter coupled to the M2 sample delay and comprising a second filter output;
• filter reinforcement logic connected to the first filter output and the second filter output;
• and
• signal reinforcement logic comprising circuitry, program instructions stored in memory, or both, where the signal reinforcement logic is connected to the signal input and the filter reinforcement logic.

A method for enhancing a signal, comprising:

• receiving an input signal comprising a fundamental frequency;
• delaying the input signal by multiple different sample delays to obtain multiple differently delayed input signals;
• applying a partitioned adaptive filter comprising multiple individual adaptive filters to the multiple differently delayed input signals;
• generating a filtered output with the partitioned adaptive filter, the filtered output approximately delayed by an integer multiple of the fundamental frequency;
• generating an error signal for each of the multiple individual adaptive filters;
• adapting each of the individual adaptive filters based on the error signal for that individual adaptive filter;
• and
• reinforcing the input signal with the filtered output.

A product comprising:

• a machine readable medium;
• and
• machine readable instructions embodied on the machine readable medium that:
• delay an input signal comprising a fundamental frequency by multiple sample delays to obtain multiple differently delayed input signals;
• apply a partitioned adaptive filter comprising multiple individual adaptive filters to the multiple delayed input signals;
• generate a filtered output with the partitioned adaptive filter, the filtered output approximately delayed by an integer multiple of the fundamental frequency;
• and
• reinforce the input signal with the output estimate.