Improving the quality of the speech signal using a FIR band pass filter with Fast Fourier transform

Abstract

Noise and echo is a key factor for the quality of speech signal that the listener will be less effective. This article proposes an improving the quality of speech signal using FIR band pass filter with Fast Fourier Transform (FFT) to filter the noise and echo signal. Each speech signal from 54 positions in a room is used to be the input signal in this experiment. These speech signal are then pass through the FIR band pass filter N = 80 and also uses the FFT to analysis the frequency speech. The experiment results show that the FIR band pass filter N = 80 can reduce the noise and echo speech signal in the range of 500 Hz–2.5 kHz when comparing in the frequency domain with FFT. It provides the approximately 80% improving of the quality speech signal.