基于现场可编程模拟阵列FPAA的音频均衡器设计

Design of Audio EQ Based on Field Programmable Analogy Arrays

数字音频均衡器中最关键的部分就是滤波系统,滤波系统精度的高低、效果的好坏直接决定着整台均衡器对音频的修饰效果.本文采用开关电容技术的现场可编程模拟阵列FPAA构成的数字音频均衡器,选择了一种全新构建音频均衡器的设计方法,以求获得一个使用方便、音效调节效果好、成本低的音频均衡器系统.开关电容椭圆函数滤波器的整体频率响应特性与标准曲线比较接近,是一种较好的音频均衡器滤波器系统.随着开关电容技术、电流模和电压模技术的进一步发展,FPAA可广泛用于工控、医疗、仪器、高级音频、自动测试设备、汽车、通信等领域.

The filter system is the most pivotal part of the digital audio equalizer;its precision and effect influence the whole audio equalizer performance. In this paper a new design method for audio equalizer is proposed, that is digital audio equalizer system based on Field Programmable Analogy Arrays （FPAA） of switch capacitance technology. With this method,the audio equalizer system will be greatly enhanced in convenience,efficiency and performance ,low cost. The frequency responses of Elliptic function illters of switch capacitance is very closely to the ideal sound styles frequency response curves, which is a good system of the audio equalizer filters. With the further development of switch capacitance technology, current model and voltage model technology, FPAA will expect a considerable development and wider application in medical, instrument, senior audio, automatic test equipment, communications and motor vehicle etc.