想问一下语音信号分帧加窗后做fft时怎么设置频率分辨率
% df = 2;
% Nfft = fs/df+1 为什么我设置了频率分辨率后,做出来的频谱就不对了?是不是和窗函数有关系
Nfft = fs;
f = (0:Nfft-1)*fs/Nfft;
win = hanning(fs);
inc = floor(0.3333 * fs);
frame = enframe(sig, win, inc);
fn = (length(sig) - fs) / inc + 1;
L = floor(fn);
y = 0;
a = 0;
for j = 1 : L
frame1(j, :) = 2 * frame(j, :); %这里为什么要乘2?
a = (abs(fft(frame1(j, :), Nfft)) / (Nfft / 2)) .^ 2 / 2;
y = y + a;
end
y = y / L;
y(1) = y(1) / 2;
Ly = 10 * log10(y / 4e-10);