正确加窗语音信号

Question

我正在对语音信号应用汉明 window 以执行音频声音的特征提取。

我将信号分成帧的方式是否正确？我应该使用 window 重叠吗？

Here's my attempt using MATLAB:

clear
close all

[data,fs] = audioread('speech_demo.wav');

timeWindow   = 20e-3;
lengthWindow = round(timeWindow*fs); % number of samples per window

L       = lengthWindow;
w_start = 0;
w_end   = lengthWindow;
j = 1;
for k = 1:round(length(data)/lengthWindow)

    x = w_start:w_end-1;
    hold on
    plot(x,hann(lengthWindow),'r:');
    plot(x,data(x+1),'k.-')
    plot(x,data(x+1).*hamming(lengthWindow),'m.-')
    wSignal(j:L*k,:) = data(x+1).*hamming(lengthWindow);

    w_start = w_start + L;
    w_end   = w_start + L;
    j       = L*k+1;

end
set(gcf,'color','w')

信号图和 windows：

放大：

谢谢。

Answer 1

基于我对使用 buffer 和 bsxfun 的评论。考虑以下代码，

[y,Fs] = audioread('someAudioFile.wav');

timeWindow   = 20e-3;
lengthWindow = round(timeWindow*Fs); % number of samples per window

% third argument specifies the number of overlapping samples
yBuffer = buffer(y, lengthWindow, round(lengthWindow*0.2));
hammWin = hamming(lengthWindow);

yBufferWindowed = bsxfun(@times, yBuffer, hammWin);

正确加窗语音信号

Windowing a speech signal correctly

matlab

speech-recognition

signal-processing

fft

speech