从信号中提取特征并将其保存在文件中

Question

我正在Matlab中制作一个脚本，以便从音频信号中提取特征。这是代码：

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。当我执行代码时，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！

Answer 1

您的局部变量会覆盖 Matlab 函数。

例如：min = min(y); ，创建一个名为 min 的局部变量，从现在开始，当您使用 min 时，使用该变量而不是min函数。

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);

我修改了您的局部变量名称(只是在每个变量的末尾添加了0(。