Design of a DSP-based 24 bit digital audio equalizer for automotive applications

The project deals with the design and realization of a dedicated board DSP-based for the processing of audio signals for automotive applications (DIGIcar). The I/O interface of the board is composed of two stereo inputs and two stereo outputs. The prototype was realized in a four layer PCB with SMD components. The layers were designed in order to reduce high frequency effects of digital signals on analog audio signals. 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 to synthesize the suitable equalizing filters given standard acoustics car measurements. Then the filters are stored in the board Flash EEPROM. A few options are available to tailor the equalizer for different cars. Listening tests and acoustic measurements show the effectivene...

• Type: Conference
• Year: 2002
• Where: ISCAS
• Authors: Alberto Bellini, Eraldo Carpanoni, Giacomo Frassi, Monica Tesauri, Emanuele Ugolotti
• Keywords: Analog Audio Signals, Audio Signals, DIGIcar Board, Hardware, ISCAS 2002