3.2具体代码说明 3.2.1函数mffc:
function r = mfcc(s, fs) ---
m = 100; n = 256;
l = length(s);
nbFrame = floor((l - n) / m) + 1; %沿-∞方向取整 for i = 1:n
for j = 1:nbFrame
M(i, j) = s(((j - 1) * m) + i); %对矩阵M赋值 end end
h = hamming(n); %加 hamming 窗，以增加音框左端和右端的连续性 M2 = diag(h) * M; for i = 1:nbFrame
frame(:,i) = fft(M2(:, i)); %对信号进行快速傅里叶变换FFT end
t = n / 2; tmax = l / fs; m = melfb(20, n, fs); %将上述线性频谱通过Mel 频率滤波器组得到Mel 频谱,下面在将其转化成对数频谱
n2 = 1 + floor(n / 2);
z = m * abs(frame(1:n2, :)).^2;
r = dct(log(z)); %将上述对数频谱，经过离散余弦变换(DCT)变换到倒谱域，即可得到Mel 倒谱系数(MFCC参数) 3.2.2函数disteu
---计算测试者和模板码本的距离 function d = disteu(x, y)
[M, N] = size(x); %音频x赋值给【M，N】 [M2, P] = size(y); %音频y赋值给【M2，P】 if (M ~= M2)
error('不匹配！') %两个音频时间长度不相等 end
d = zeros(N, P);
if (N < P)%在两个音频时间长度相等的前提下 copies = zeros(1,P); for n = 1:N
d(n,:) = sum((x(:, n+copies) - y) .^2, 1); end else
copies = zeros(1,N); for p = 1:P
