加窗matlab音频
时间: 2023-12-06 13:37:30 浏览: 29
以下是使用汉明窗加窗matlab音频的示例代码:
```matlab
% 读取音频文件
[y, Fs] = audioread('example.wav');
% 设置窗口大小和重叠长度
win_size = 256;
overlap = win_size / 2;
% 使用enframe函数将音频分帧
frames = enframe(y, win_size, overlap);
% 构造汉明窗
win = hamming(win_size);
% 对每一帧进行加窗
win_frames = frames .* repmat(win', size(frames, 1), 1);
% 将加窗后的帧合并成音频
y_win = overlapadd(win_frames, overlap);
% 播放加窗后的音频
sound(y_win, Fs);
```
其中,`enframe`函数用于将音频分帧,`hamming`函数用于构造汉明窗,`repmat`函数用于将汉明窗复制成与每一帧相同的大小,`overlapadd`函数用于将加窗后的帧合并成音频。
相关问题
预加重分帧加窗matlab
预加重、分帧和加窗是语音处理中常用的步骤。下面是一个在Matlab中实现预加重、分帧和加窗的示例:
```matlab
% 预加重
pre_emphasis = 0.97; % 预加重系数
audio_signal = % 输入音频信号
pre_emphasized_signal = filter([1, -pre_emphasis], 1, audio_signal);
% 分帧
frame_length = 0.025; % 帧长(秒)
frame_overlap = 0.01; % 帧重叠(秒)
frame_length_samples = round(frame_length * sample_rate); % 帧长(样本数)
frame_overlap_samples = round(frame_overlap * sample_rate); % 帧重叠(样本数)
num_frames = floor((length(pre_emphasized_signal) - frame_length_samples) / frame_overlap_samples) + 1; % 帧数
frames = zeros(frame_length_samples, num_frames); % 存储分帧结果
for i = 1:num_frames
start_index = (i-1) * frame_overlap_samples + 1;
end_index = start_index + frame_length_samples - 1;
frames(:, i) = pre_emphasized_signal(start_index:end_index);
end
% 加窗
window_type = 'hamming'; % 窗函数类型
window = window(window_type, frame_length_samples);
windowed_frames = frames .* window;
```
这段代码首先进行预加重,然后将音频信号分成多个帧,最后对每个帧进行加窗操作。你可以根据自己的需求调整预加重系数、帧长、帧重叠和窗函数类型。
语音信号分帧加窗matlab
以下是MATLAB中语音信号分帧加窗的代码示例:
%% 读取音频文件
[x,fs] = audioread('example.wav');
%% 设置帧长和帧移参数
frame_len = 0.02; % 帧长(秒)
frame_shift = 0.01; % 帧移(秒)
%% 将帧长和帧移转换为采样点数
frame_len = round(frame_len*fs); % 帧长(采样点)
frame_shift = round(frame_shift*fs); % 帧移(采样点)
%% 分帧加窗
nframes = fix((length(x)-frame_len+frame_shift)/frame_shift); % 计算帧数
frames = zeros(nframes,frame_len); % 初始化帧矩阵
for i = 1:nframes
index = (i-1)*frame_shift+1;
frames(i,:) = x(index:index+frame_len-1).*hamming(frame_len)';
end
%% 显示第一帧的波形和谱图
subplot(2,1,1);
plot(frames(1,:));
title('第一帧波形');
subplot(2,1,2);
spectrogram(frames(1,:),hamming(frame_len)',0,frame_len,fs,'yaxis');
title('第一帧谱图');