基于FPGA数字信号音频处理 毕业论文.doc

PAGE 34 基于FPGA数字信号音频处理 The Digital Signal Processing of audio based on FPGA 摘 要：目前，随着电子技术的快速发展人们对MP3多媒体播放器、DVD音频唱盘、Iphone等的音质、体积、功耗和处理速度有了更多更高要求。因此现在数字音频处理技术已经逐渐取代模拟音频处理技术，并且得到了迅速的普及应用。 音频处理的数字化是利用数字滤波算法对采集的音频信号进行变换处理来实现，对此在本文中介绍了数字滤波器的一些算法。傅里叶变换（DFT）作为其数字信号处理中的基本运算，发挥着重要作用。特别是可快速傅里叶变换换（FFT）算法的提出，减少了当N很大的时候DFT的运算量，使得数字信号处理的实现与应用变得更加容易。由于快速傅里叶变换算法在实际中得到了广泛应用，毕业设计给出了基-2FFT原理、讨论了按时间抽取FFT算法的特点。 本文主要探讨了基于FPGA数字信号音频处理的理论与实现，涉及到了其结构与设计流程、硬件描述语言（VHDL）、Quartus = 2 \* ROMAN II软件、音频录放、DE2开发板介绍等等。 关键词：音频处理技术、 数字滤波 、算法、FPGA Abstract At present,with the rapid development of the electronic technology,people have many higher requirements such as sound quality,volume,power waste and processing speed to the MP3 multimedia,DVD audio disc,Iphone and so on.So nowadays,the analog audio processing technology is replaced gradually by the digital audio processing technology,and digital audio processing technology has a chance to become common and widely used. The audio processing digitization is using the digital filter algorithm to sample.In the part of this passage there are some introduction about the digital filter algorithm. DFT plays an important part in digital signal processing as a basic calculation.Especially,FFT algorithm reduces the calculation quantity when N is a little great ,which makes it much easier for implement and application.As the fast Fourier transform algorithm in practice to a wide range of applications，radix-2 FFT theory has been given out and the characteristic of DIT FFT are discussed in the design of graduation. The passage mainly probes into the theories and realization of the digital signal processing of audio based on FPGA(Field Programmable Gate Array),including its structure and processing of design.It also contains VHDL，Quartus = 2 \* ROMAN II software ，audio record and broadcast,introduction of DE2 study board and so on. Keywords:audio processing technology、digital filter、algorithm、FPGA 前言 第一章 绪论 1.1音频处理技术概述 在科技飞速发展的数字化时