In accordance with an embodiment of the present invention, a noise reduction method for speech processing includes cancelling or reducing noise/interference component signal in speech signal enhancement processing, the method comprising estimating the noise/interference component signal by subtracting voice component signal from a first microphone input signal wherein the voice component signal is evaluated as a first replica signal produced by passing a second microphone input signal through a first adaptive filter. Energy variation of the noise/interference component signal is adjusted based on noise stability detection and/or energy explosion detection, wherein the energy of the noise/interference component signal is reduced or smoothed in voice area or energy explosion area if the stable noise is detected and/or the energy explosion is detected. A noise/interference reduced signal is outputted by subtracting a second replica signal from the target signal, wherein the second replica signal is produced by passing the adjusted noise/interference component signal through a second adaptive filter.