Frequency domain training to compensate acoustic instrument pickup signals

An acoustic instrument signal compensation apparatus comprising:

• a first input port configured to sample a first signal received at the input port from a first source responsive to an undetermined broadband excitation of an acoustic body instrument;
• a second input port configured to sample a second signal received at the input port from a second source responsive to the excitation;
• a first data memory configured to store a plurality of filter coefficients;
• a signal processor module operatively coupled to receive the sampled first signal and the sampled second signal, and to send a plurality of trained filter coefficients to be stored in the first data memory;
• and,
• a program memory coupled to the signal processor module and containing instructions that, when executed, cause the signal processor module to perform operations to generate the trained filter coefficients, the operations comprising:
• a) receive a frequency domain representation (X1(k)) of the sampled first signal;
• b) receive a frequency domain representation (X2(k)) of the sampled second signal;
• c) deconvolve the (X1(k)) with the (X2(k)) to generate a quotient vector;
• and,
• d) determine whether to use the generated quotient vector to generate the trained coefficients based on a comparison of the generated quotient vector to a predetermined model associated with predetermined characteristics of the acoustic body instrument.

An acoustic instrument signal compensation apparatus comprising:

• a first input port configured to sample a first signal received at the input port from a first source responsive to an undetermined broadband excitation of an acoustic body instrument;
• a second input port configured to sample a second signal received at the input port from a second source responsive to the excitation;
• a first data memory configured to store a plurality of filter coefficients;
• a signal processor module operatively coupled to receive the sampled first signal and the sampled second signal, and to send a plurality of trained filter coefficients to be stored in the first data memory;
• and,
• means coupled to the signal processor module for causing the signal processor module to perform operations to generate a quotient vector and determine whether to use the generated quotient vector to generate the trained coefficients based on a comparison of the generated quotient vector to a predetermined model associated with predetermined characteristics of the acoustic body instrument.