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Design of a Digital Audio Equalizer for Automotive Applications

The project delas with the design and realization of a dedicated board for the processing of audio signals for automotive applications, named DIGIcar. It features two stereo inputs (24 bit resolution) and two stereo outputs. The prototype was realized in a 4 layer PCB with SMD components. The DIGIcar board was tested stand-alone with an Audio Precision System 2022. Experiments were performed inside a car too, where the DIGIcar board was interfaced with a four channel power amplifier and connected between audio source and car loudspeakers. A development tool in MATLAB was exploited in order to synthesize the suitable equalizing filters, given standard acoustic car measurements. Then the filters are stored in the board FLASH EEPROM. A few options are available to tailor the equalizer for differen cars. Listening tests and acoustic measurements show the effectiveness and the functionality of the designed board.

Authors: Bellini, Alberto; Tesauri, Monica; Ugolotti, Emanuele; Carpanoni, Eraldo; Frassi, Giacomo
Affiliations: University of Parma, Parma, ITALY ; ASK Industries, ITALY(See document for exact affiliation information.)
AES Convention:112 (April 2002) Paper Number:5542 Import into BibTeX
Subject:Automotive Audio

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