写一段matlab代码,提取语音信号的mfcc特征(语音信号存储在audio_data中)
时间: 2024-06-03 15:07:45 浏览: 11
% 假设语音信号已经存储在变量audio_data中
% 定义参数
fs = 16000; % 采样率
win_size = 0.025; % 分帧窗口大小(秒)
hop_size = 0.01; % 分帧窗口移动大小(秒)
num_mfcc = 13; % mfcc系数个数
% 将语音信号分帧
frame_length = round(win_size * fs);
frame_shift = round(hop_size * fs);
num_frames = floor((length(audio_data) - frame_length) / frame_shift) + 1;
frames = zeros(frame_length, num_frames);
for i = 1:num_frames
start_index = (i - 1) * frame_shift + 1;
end_index = start_index + frame_length - 1;
frames(:, i) = audio_data(start_index:end_index);
end
% 对每一帧计算mfcc特征
mfccs = zeros(num_mfcc, num_frames);
for i = 1:num_frames
frame = frames(:, i);
% 计算每一帧的mfcc系数
mfcc = melcepst(frame, fs, 'M', num_mfcc, floor(3*log(fs)), frame_length, frame_shift);
mfccs(:, i) = mfcc';
end
% 输出mfcc特征矩阵
disp(mfccs);