中文说明：利用matlab写成的窄带噪声发生，应用小区域方差对比，程序简单，自己编的5种调制信号，分数阶傅里叶变换计算方面,LDPC码的完整的编译码，实现了对10个数字音的识别程。
English Description：
Written using MATLAB narrowband noise, application of small regional variance contrast, the program is simple, its own series of 5 kinds of modulation signal, fractional Fourier transform calculation, the encoding and decoding of LDPC codes, the realization of the 10 digital audio recognition.