我正在尝试提取音频文件的峰值.我有以下代码来提取振幅谱的包络.但是我没有得到所需的输出图.有人可以告诉我需要做些什么调整来获得正确的图表.这是我的代码:
[song,FS] = wavread('c scale fast.wav');
P=20000/44100*FS; % length of filter
N=length(song); % length of song
t=0:1/FS:(N-1)/FS; % define time period
% Plot time domain signal
figure(1);
subplot(3,1,1)
plot(t,(3*abs(song)))
title('Wave File')
ylabel('Amplitude')
xlabel('Length (in seconds)')
xlim([0 1.1])
xlim([0 N/FS])
% Gaussian Filter
x = linspace( -1, 1, P); % create a vector of P values between -1 and 1 inclusive
sigma = 0.335; % standard deviation used in Gaussian formula
myFilter = -x .* exp( -(x.^2)/(2*sigma.^2));% compute first derivative, but …