Analysis and Simulation of an Audio Adaptive Equalizer

摘要

The purpose of this thesis was to explore the feasibility of replacing a manual audio equalizer with an adaptive filter that adaptively equalizes the spectral distortion of an audio system. The impulse response of an audio system which includes the response of the speaker crossover network, the power amplifiers, speakers, and the acoustic transfer function between the system's input signal spectrum. The Adaptive Inverse Pre-filter, the Filtered-x algorithm, and the Adaptive Inverse Modeling Control System are investigated which remove the distortion by pre-filtering the audio system's input signal with the audio system's inverse. The audio system examined is the Armstrong Aerospace Medical research Laboratory's Performance and Communication Research and Technology reverberation chamber located at Wright-Patterson Air Force Base. Keywords: Digital filters; Adaptive filters; Audio frequency; Equalization. (jes)