基于微处理器与现场可编程模拟阵列(FPAA)的数字音频均衡器设计

由于分立器件与运放构建的模拟电感音频均衡器,因受分立器件本身性能影响,存在许多不利因素,使得该音频均衡器在竞争中处于劣势;鉴于纯数字音频均衡器性能相对稳定但价位较高,其应用集中于高档场合而难以普及。本文提出了一种新的音频均衡器设计方法,采用摩托罗拉Anadigm子公司的现场可编程模拟阵列产品AN221E04和Freescale低成本微处理器GT60构建的高集成、高精度、高信噪比、高抗干扰能力的模拟可编程结构的数字音频均衡器系统。该系统软件仿真性能优良,容易达到预期设计效果。该设计方法证明可编程产品的应用将大大提高模拟领域的设计性能。

Design of digital audio EQ based on micro-processor and field programmable analogy arrays

With the development of multimedia technology,performance of media equipment has been greatly improved.The traditional audio equalizer is constructed by op-amplifiers and discrete components,being influenced by the specifications of discrete components.These equalizers have disadvantages of poor stability,and declining quality in short-term and insufficient anti-jamming ability.Moreover,the analogy design is complicated,and the system debug and balance is difficult and time consuming.In contrast,full-digital audio equalizer has good performance and stability,but the price is expensive.We propose a new design method for audio equalizer,that is,to design a high precision and high SNR digital audio equalizer system based on field programmable analogy arrays(FPGA) and micro-controller.With this method,efficiency and performance will be greatly enhanced.