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

2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353) Pub Date : 2002-08-07 DOI:10.1109/ISCAS.2002.1009835

A. Bellini, E. Carpanoni, G. Frassi, Monica Tesauri, E. Ugolotti

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引用次数: 2

Abstract

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 car acoustic 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 effectiveness and the functionality of the designed board.

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基于dsp的汽车用24位数字音频均衡器设计

该项目涉及基于dsp的专用板的设计和实现，用于处理汽车应用(DIGIcar)的音频信号。板的I/O接口由两个立体声输入和两个立体声输出组成。该原型是在四层PCB板上实现的。设计这些层是为了减少数字信号对模拟音频信号的高频影响。DIGIcar板在音频精密系统2022上进行了独立测试。实验也在车内进行，其中DIGIcar板与一个四通道功率放大器接口，并连接在音源和汽车扬声器之间。利用MATLAB开发工具，在标准汽车声学测量条件下合成合适的均衡滤波器。然后将滤波器存储在主板闪存EEPROM中。有几个选项可供定制均衡器为不同的汽车。听力测试和声学测量表明了所设计板的有效性和功能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353)

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