Patent ID: 8693703

Claim:
A method of improving the signal to noise ratio of a user's voice captured by a microphone in a headset comprising the steps of combining two audio signal, by a) measuring a sound signal at a first spatial position using a first transducer in the headset, in order to generate a first audio signal comprising a first target signal portion including the user's voice and a first noise signal portion, b) measuring the sound signal at a second spatial position using a second transducer, in order to generate a second audio signal comprising a second target signal portion including the user's voice and a second noise signal portion, c) processing the first audio signal in order to phase match and amplitude match the first target signal with the second target signal within a predetermined frequency range and generating a first processed output, wherein the first audio signal processed by using a pre-calibrated matching filter in order to phase match and amplitude match the first target signal with the second target signal within a predetermined frequency range, wherein the matching filter is pre-calibrated to a predetermined geometry of transducers and the target source of the user, d) calculating the difference between the second audio signal and the first processed output in order to generate a subtraction output, by using an adaptive filter having an adaptive parameter, e) calculating the sum of the second audio signal and the first processed output in order to generate a summation output, f) processing the subtraction output in order to minimise a contribution from the noise signal portions to the system output signal and generating a second processed output, and g) calculating the difference between the summation output and the second processed output in order to generate the system output signal.