1. 读取WAV声音文件
% wavread(filename) 读取一个WAVE文件，并返回采样数据到向量y中，Fs表示采样频率, bits表示采样位数
[y, Fs, bits] = wavread('drum.wav');
%假设声音文件有两个声道，我们只分析第一个声道，如果要分析第二个声道可以改为：ft=y(:,2);
ft = y(:,1);
sigLength = length(ft); %获取声音长度
%可以使用sound函数来播放声音
sound(y, Fs, bits)
>> left = y(:,1);
>> leftSigLength = length(left)
leftSigLength =
106764
>> sound(y, Fs, bits)
>> ydown10=y./10;
>> sound(ydown10, Fs, bits)
>> yup10=y.*10;
>> sound(yup10, Fs, bits)
>> sound(ydown10, Fs, bits)
>> sound(y, Fs, bits)
>> sound(yup10, Fs, bits)
>> sound(y, Fs, bits)
>> sound(ydown10, Fs, bits)
>> yleftHirightLow=[yup10(:,1);ydown10(:,1)];
>> yleftHirightLow=[yup10(:,1),ydown10(:,1)];
>> sound(yleftHirightLow, Fs, bits)
>> sound(yleftHirightLow, Fs, bits)
>> yleftLowrightHi=[ydown10(:,1),yup10(:,1)];
>> sound(yleftLowrightHi, Fs, bits)
>>
>> wavwrite(ydown10,Fs,'ydown10.wav');
>> wavwrite(yup10,Fs,'yup10.wav');
Warning: Data clipped during write to file:yup10.wav
> In wavwrite>PCM_Quantize at 248
In wavwrite>write_wavedat at 272
In wavwrite at 114
>> wavwrite(yleftHirightLow,Fs,'yleftHirightLow.wav');
Warning: Data clipped during write to file:yleftHirightLow.wav
> In wavwrite>PCM_Quantize at 248
In wavwrite>write_wavedat at 272
In wavwrite at 114
>> wavwrite(yleftLowrightHi,Fs,'yleftLowrightHi.wav');
Warning: Data clipped during write to file:yleftLowrightHi.wav
> In wavwrite>PCM_Quantize at 248
In wavwrite>write_wavedat at 272
In wavwrite at 114
>>
