Multi-channel signal separation

Claim 2

A signal processing system comprising: a plurality of detectors for detecting source signals subjected to a generating system transfer function; a processor for receiving the detected signals and producing a reconstruction filter for filtering the detected signal to produce reconstructed source signals, the reconstruction filter being produced such that correlation between reconstructed source signals is forced to approach zero even when each detector receives source signals from plural sources; and said reconstruction filter for receiving the detected signals to generate a reconstruction of the various source signals without interference from any of the other source signals.

Claim 3

A signal processing system, as recited in claim 1, wherein the reconstruction filter is inversely related to said transfer function.

Claim 4

A signal processing system, as recited in claim 2, wherein some of the transfer function parameters are known.

Claim 5

A signal processing system, as recited in claim 2, wherein none of the transfer function parameters are known and the transfer function has a finite impulse response.

Claim 6

A signal processing system, as recited in claim 4, wherein the reconstruction filter is adjusted iteratively.

Claim 7

A signal processing system, as recited in claim 4, wherein the reconstruction filter is adaptive.

Claim 8

A signal processing system, as recited in claim 1, wherein the reconstruction filter has a finite impulse response.

Claim 9

A signal processing system comprising: a first detector for receiving at least one source signal subjected to a generating system transfer function; a second detector for receiving at least one source signal subjected to said generating system transfer function; a reconstruction filter including a first transfer function to which a first signal from the first detector is applied and a second transfer function to which a second input signal from the second detector is applied, the output of the first transfer function being subtracted from the second input signal and the output of the second transfer function being subtracted from the first input signal; such that the reconstruction filter for filtering the first and second signals produce reconstructed first and second source signals with a correlation that is forced to approach zero even when each detector receives source signals from plural sources.

Claim 10

A signal processing system comprising: a first detector for receiving at least one source signal subjected to a generating system transfer function; a second detector for receiving at least one source signal subjected to said generating system transfer function; a reconstruction filter including a first transfer function to which a first signal from the first detector is applied and a second transfer function to which a second input signal from the second detector is applied, the output of the first transfer function being subtracted from the second input signal and the output of the second transfer function being subtracted from the first input signal; such that the reconstruction filter for filtering the first and second signals produce reconstructed first and second source signals with a correlation that is forced to approach zero even when each detector receives source signals from plural sources.

Claim 11

A signal processing system, as recited in claim 8, wherein the first and second transfer function are tapped delay lines with a plurality of equal delay segments, the output of each delay segment is multiplied by a filter coefficient, and the filter coefficient outputs for the respective delay segments are summed to serve as outputs for the first and second transfer functions.

Claim 12

A signal processing system, as recited in claim 9, wherein the reconstruction filter is inversely related to said transfer function.

Claim 13

A signal processing system, as recited in claim 10, wherein some filter coefficients are known.

Claim 14

A signal processing system, as recited in claim 10, wherein none of the filter coefficients are known and the generating system transfer function has a finite impulse response.

Claim 15

A signal processing system, as recited in claim 12 wherein the reconstruction filter is adjusted iteratively.

Claim 16

A signal processing system, as recited in claim 12, wherein the reconstruction filter is adaptive.

Claim 17

A signal processing system, as recited in claim 8, wherein the reconstruction filter has a finite impulse response.

Claim 20

A method, as recited in claim 16, wherein the reconstruction filter is inversely related to said transfer function.

Claim 21

A method, as recited in claim 17, wherein some of the transfer function parameters are known.

Claim 22

A method, as recited in claim 17, wherein none of the transfer function parameters are known and the transfer function has a finite impulse response.

Claim 23

A method, as recited in claim 19, wherein the reconstruction filter is adjusted iteratively.

Claim 24

A method, as recited in claim 19, wherein the reconstruction filter is adaptive.

Claim 25

A method, as recited in claim 16, wherein the reconstruction filter has a finite impulse response.

Claim 26

A signal processing system, for reconstructing first source signal S 1 and a second source signal S 2 which are subjected to a generating transfer function, comprising (a) a first detector which produces a first observed signal y 1 from at least one source signal subjected to said transfer function; (b) a second detector which produces a second observed signal y 2 from at least one source signal subjected to said transfer function; (c) a reconstruction filter including: (i) a first filter H 21 which processes the first observed signal y 1 and produces a first output signal U 1 , (ii) a second filter H 12 which processes the second observed signal y 2 and produces a second output signal U 2 , (iii) a first subtractor which subtracts V 2 from Y 1 to produce V 1 , (iv) a second subtractor which subtracts U 1 from Y 2 to produce V 2 , (v) a processing transform which converts the signals V 1 and V 2 , respectively, into reconstructed source signals, S 1 and S 2 , respectively, wherein the correlation between the reconstructed source signals is forced to approached zero, even when each detector receives source signals from plural sources.

Claim 27

A signal processing system, for reconstructing first source signal S 1 and a second source signal S 2 which are subjected to a generating transfer function, comprising (a) a first detector which produces a first observed signal y 1 from at least one source signal subjected to said transfer function; (b) a second detector which produces a second observed signal y 2 from at least one source signal subjected to said transfer function; (c) a reconstruction filter including: (i) a first filter H 21 which processes the first observed signal y 1 and produces a first output signal U 1 , (ii) a second filter H 12 which processes the second observed signal y 2 and produces a second output signal U 2 , (iii) a first subtractor which subtracts V 2 from Y 1 to produce V 1 , (iv) a second subtractor which subtracts U 1 from Y 2 to produce V 2 , (v) a processing transform which converts the signals V 1 and V 2 , respectively, into reconstructed source signals, S 1 and S 2 , respectively, wherein the correlation between the reconstructed source signals is forced to approached zero, even when each detector receives source signals from plural sources.

Claim 28

A system, as recited in claim 23, wherein the reconstruction filter is inversely related to said transfer function.

Claim 29

A system, as recited in claim 24, wherein some of the transfer function parameters are known.

Claim 30

A system, as recited in claim 24, wherein none of the transfer function parameters are known and the transfer function has a finite impulse response.

Claim 31

A system, as recited in claim 26, wherein the reconstruction filter is adjusted iteratively.

Claim 32

A system, as recited in claim 26, wherein the reconstruction filter is adaptive.

Claim 33

A system, as recited in claim 23, wherein the reconstruction filter has a finite impulse response.

Claim 36

A system, as recited in claim 30, further comprising a speech recognition device coupled to said reconstruction filter.

Claim 37

A system, as recited in claim 30, wherein the reconstruction filter is inversely related to the transfer function.

Claim 38

A system, as recited in claim 32, wherein some of the transfer function parameters are known.

Claim 39

A system, as recited in claim 32, wherein none of the transfer function parameters are known and the transfer function has a finite impulse response.

Claim 40

A system, as recited in claim 34, wherein the reconstruction filter is adjusted iteratively.

Claim 41

A system, as recited in claim 32, wherein the reconstruction filter is adaptive.

Claim 42

A system, as recited in claim 30, wherein the reconstruction filter has a finite impulse response.

Claim 43

A signal enhancing system in an underwater acoustic environment, where both a source signal and noise are subjected to a generating system transfer function, comprising a sonar array for producing and receiving ultrasonic signals, wherein the received signals represent a plurality of first observed signals Y 1 -Y p , including at least one of source signal and noise components, a microphone near a noise source which produces a second observed signal Y 2 , including at least one of source signal and noise components, a processor for receiving the first and second observed signals Y 1 --Y p and Y 2 , and producing a reconstruction filter for filtering the detected signals to produce reconstructed source signals, said reconstruction filter producing separate reconstructed signals where the correlation between the reconstructed signals is forced to approach zero, even when the sonar array and the microphone both detect source signal and noise components.

Claim 44

A signal enhancing system in an underwater acoustic environment, where both a source signal and noise are subjected to a generating system transfer function, comprising a sonar array for producing and receiving ultrasonic signals, wherein the received signals represent a plurality of first observed signals Y 1 -Y p , including at least one of source signal and noise components, a microphone near a noise source which produces a second observed signal Y 2 , including at least one of source signal and noise components, a processor for receiving the first and second observed signals Y 1 --Y p and Y 2 , and producing a reconstruction filter for filtering the detected signals to produce reconstructed source signals, said reconstruction filter producing separate reconstructed signals where the correlation between the reconstructed signals is forced to approach zero, even when the sonar array and the microphone both detect source signal and noise components.

Claim 45

A system, as recited in claim 38, wherein the reconstruction filter is inversely related to the transfer function.

Claim 46

A system, as recited in claim 39, wherein some of the transfer function parameters are known.

Claim 47

A system, as recited in claim 39, wherein none of the transfer function parameters are known and the transfer function has a finite impulse response.

Claim 48

A system, as recited in claim 41, wherein the reconstruction filter is adjusted iteratively.

Claim 49

A system, as recited in claim 41, wherein the reconstruction filter is adaptive.

Claim 50

A system, as recited in claim 38, wherein the reconstruction filter has a finite impulse response.