预加重分帧加窗matlab
时间: 2024-01-07 19:22:19 浏览: 122
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。
阅读全文