Patent ID: 6256394
Filing Date: 2001-07-03
Classification: G10L,H04R

Abstract:
A signal transmission system comprising:means for generating correlated sound signals from correlated electric signals;means for generating a wanted sound signal;at least one sensor for detecting a mixed signal, the mixed signal comprising at least the wanted sound signal and said correlated sound signals; andprocessing means coupled to said at least one sensor for isolating an estimate for said wanted sound signal contained in said mixed signal,characterized in that the processing means extracts the estimate of the wanted signal contained in the mixed signal by decorrelating, via multiple shifts, the estimate relative, respectively, to the correlated electric signal, said processing means being source separating means and comprising:a first input for receiving said mixed signal from said at least one sensor;second inputs for receiving said correlated electric signals;a first adder having a first input coupled to said first input for receiving said mixed signal;a second adder having a first input coupled to said first input for receiving one of said correlated electric signals;a third adder having a first input coupled to another of said second inputs for receiving another one of said correlated electric signals;a first adaptive filter having in input coupled to an output of the second adder and an output coupled to a second input of said first adder;a second adaptive filter having an input coupled to an output of said first adder and an output coupled to a second input of said second adder;a third adaptive filter having an input coupled to the output of said first adder and an output coupled to a second input of said third adder;a fourth adaptive filter having an input coupled to an output of said third adder and an output coupled to a third input of said first adder;a fifth adaptive filter having an input coupled to the output of said third adder and an output coupled to a third input of said second adder;a sixth adaptive filter having an input coupled to the output of said second adder and an output coupled to a third input of said third adder; andadapting means coupled to the outputs of said first, second and third adders for adapting the coefficients of the first, second, third, fourth, fifth and sixth adaptive filters,wherein the output from the first adder forms the estimate of the wanted sound signal, the output from the second adder forms an estimate of one of said correlated sound signals, and the output from the third adder forms an estimate of the other of said correlated sound signals.