| 摘要 |
There is provided a method and an apparatus for generating a noise reduced output signal from sound received by a first microphone. The method comprises transforming sound received by the first microphone into a first input signal, wherein the first input signal is the frequency domain signal of the analog-to-digital converted audio signal corresponding to the sound received by the first microphone, transforming sound received by a second microphone being spaced apart from the first microphone into a second input signal, wherein the second input signal is the frequency domain signal of the analog-to-digital converted audio signal corresponding to the sound received by the second microphone, calculating, for each frequency component, an energy transfer function value as real-valued quotient obtained by dividing a temporally averaged product of the amplitude of said first and second input signals by a temporally averaged absolute square of said second input signal, wherein temporal averaging is subject to a first update condition, calculating, for each frequency component, a gain value which is a function of said calculated energy transfer function value, and generating said noise reduced output signal based on the products of said first input signal and said calculated gain value at each frequency component. |
