Parametric audio equalizer based on short-time fourier transform

Abstract

Equalizers (EQs) have been widely used in audio and acoustic processing to adjust the magnitude of certain frequency bands. This paper proposes a parametric EQ based on short-time Fourier transform (STFT). The audio signal is equalized in the frequency domain by modifying its short-time spectrum with the interpolated magnitude frequency response of the EQ. Design examples show that the proposed method can realize the same function as filter-based equalization, while providing more adjustable frequency bands and wider range of gains. This brings in more flexible control and usage of the EQ for practical applications.