Frequency domain de-correlation parameter in speech noise reduction system based on frequency domain adaptive line enhancer

A speech noise reduction system based on a frequency domain adaptive line enhancer has been proposed. The adaptive line enhancer (ALE) is effective to extract sinusoidal signals blurred by a broadband noise and utilizes only one microphone; therefore, it is suitable for realization of speech noise reduction in the portable electronic devices. Moreover, the noise reduction system adopts the frequency domain adaptive filter using the modified DFT pair to obtain faster convergence. In the ALE, an input signal is generated by delaying a desired signal by the de-correlation parameter, which makes a noise in the input signal de-correlated with that in the desired one. In this paper, we introduce individual de-correlation parameters in frequency domain signals and adjust them according to the dominancy of the speech element in noisy speech. Noise reduction performance is examined through computer simulations using several speeches.