FAAD2 is a HE, LC, MAIN and LTP profile, MPEG2 and MPEG

Adaptive Delta Modulation Demo

关于声卡采集的一个程序，可做FFT，利用声卡做采集卡，可做声音的频谱分析。-card on a procedure for the acquisition, FFT can do, using sound card collection to do, to do the voice spectrum analysis.

主要讲了SM算法的内容在本部分规定的椭圆曲线数字签名算法中，涉及到两类辅助函数：密码杂凑函数与随机数发生器。

dsp音频驱动，dm6467读写tlv320aic32-dm6467 control tlv320aic32 by i2c

封装了使用wav文件对象的录音和播放api。-Wav file package object to use recording and playback api.

使用DELPHI实现文本文件显示和声音同步播放-use DELPHI text documents and voice simultaneously broadcast

音频分类和音频放大器；分析，支持向量机分类，音频分割

C++编译OpenH323代码的源代码，有助于学习掌握基本的OpenH323技术。值得学习和参考-C++ Compile OpenH323 code, source code, contribute to learning and mastering the basic techniques of OpenH323. Worthy of study and reference

rt_lpc is a light-weight application that performs real-time LPC analysis and synthesis. It features the following: real-time LPC analysis real-time LPC synthesis visualization of original, predicted, and error waveforms visualization of vocal tract shape from LPC coefficients adjustable LPC analysis order adjustable synthesis pitch shift MIDI controlled pitch (hit m ) lots of other choices (pitch pulse source selection, emphasis filter) STFT plot modular LPC library available on MacOS X, Linux, and Windows under GPL part of the sndtools distribution

应用背景用于产生一个正弦扫频信号，我是用来测量声音在粮食中的衰减程度，扫频信号它与噪声的相关程度比较小，接收到的波形不易失真，所以设计了这个声音发射器。关键技术产生一个正弦扫频信号，并且扫频信号的幅值，发声时间以及起始频率和终止频率可以在前面板中进行设置，通过适当的调整便可以得到一个你所需要的声音发声器