从信号中提取特征并将其保存在文件中

问题描述：

我正在Matlab中创建一个脚本，以便从音频信号中提取特征。这是代码：从信号中提取特征并将其保存在文件中

clear;clc; 

folder = dir('sonidos'); 
m = length(folder); 

fileW = fopen('caracteristicas.txt','wt'); 

for i = 3:m 
    file = strcat('sonidos/', folder(i).name); 
    fprintf('Leyendo Archivo: %s \n', file); 
    [y, Fs] = audioread(file); 
    max = max(y); 
    mean = mean(y); 
    min = min(y); 
    median = median(y); 
    peak2peak = peak2peak(y); 
    peak2rms = peak2rms(y); 
    rms = rms(y); 
    rssq = rssq(y); 
    std = std(y); 
    var = var(y); 
    kurtosis = kurtosis(y); 
    power = (norm(y)^2)/length(y); 
    fprintf('Caracteristicas: %f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f \n', ... 
      Fs, max, mean, min, median, peak2peak, peak2rms, rms, rssq, std, var, kurtosis, power); 
    fprintf(fileW,'%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f \n', ... 
        Fs, max, mean, min, median, peak2peak, peak2rms, rms, rssq, std, var, kurtosis, power); 
end 

fclose(fileW);

音频文件位于'sonidos'文件夹中。当我执行代码MatLab说：

Leyendo Archivo: sonidos/1.wav 
Caracteristicas: 22050.000000,0.352722,-0.000128,-0.435028,-0.000092,0.787750,17.550266,0.024788,6.027810,0.024787,0.000614,47.710490,0.000614 
Leyendo Archivo: sonidos/2.wav 
Subscript indices must either be real positive integers or logicals.

感谢您的帮助！

通常这个错误还会提供一个行号。它是否说类似“下标索引必须是真正的正整数或逻辑” 测试错误（第15行）rms = rms（y）;“？ – Cecilia

不，它不提供行号。我尝试每行注释，如果我取消注释行max = max（y），则会发生错误。所以，这个脚本读取所有文件，但不能提取任何功能。 –

答

您的本地变量重写Matlab函数。

例如：min = min(y);，创建了一个名为min一个局部变量，并从现在起，当您使用min，变量是用来代替min功能。

检查以下内容：

clear;clc; 

folder = dir('sonidos'); 
m = length(folder); 

fileW = fopen('caracteristicas.txt','wt'); 

for i = 3:m 
    file = strcat('sonidos/', folder(i).name); 
    fprintf('Leyendo Archivo: %s \n', file); 
    [y, Fs] = audioread(file); 
    max0 = max(y); 
    mean0 = mean(y); 
    min0 = min(y); 
    median0 = median(y); 
    peak2peak0 = peak2peak(y); 
    peak2rms0 = peak2rms(y); 
    rms0 = rms(y); 
    rssq0 = rssq(y); 
    std0 = std(y); 
    var0 = var(y); 
    kurtosis0 = kurtosis(y); 
    power0 = (norm(y)^2)/length(y); 
    fprintf('Caracteristicas: %f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f \n', ... 
     Fs, max0, mean0, min0, median0, peak2peak0, peak2rms0, rms0, rssq0, std0, var0, kurtosis0, power0); 
    fprintf(fileW,'%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f \n', ... 
       Fs, max0, mean0, min0, median0, peak2peak0, peak2rms0, rms0, rssq0, std0, var0, kurtosis0, power0); 

end 

fclose(fileW);

我修改了本地变量的名称（刚刚添加0到每个月底）。

感谢您的帮助！有用！ –

从信号中提取特征并将其保存在文件中

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