利用S变换结果矩阵，得到频谱，设置能量阈值，频率范围，计算基频与基音周期。请给我matlab代码

好的，以下是一份简单的 Matlab 代码，用于计算语音信号的基频和基音周期：

% 读取语音信号
[s, Fs] = audioread('your_audio_file.wav');
% 设置分析参数
frame_length = 20; % 每帧的长度（毫秒）
frame_shift = 10; % 帧移（毫秒）
energy_threshold = 0.3; % 能量阈值
f0_min = 60; % 基频的最小值（赫兹）
f0_max = 400; % 基频的最大值（赫兹）
% 将语音信号分帧
frame_length = round(frame_length / 1000 * Fs);
frame_shift = round(frame_shift / 1000 * Fs);
num_frames = floor((length(s) - frame_length) / frame_shift + 1);
frames = zeros(num_frames, frame_length);
for i = 1:num_frames
    frames(i, :) = s((i-1)*frame_shift+1:(i-1)*frame_shift+frame_length);
end
% 计算每帧的能量
energy = sum(frames.^2, 2);
% 按照能量阈值筛选帧
voiced_frames = find(energy > energy_threshold * max(energy));
% 计算基频和基音周期
f0 = zeros(num_frames, 1);
pitch_period = zeros(num_frames, 1);
for i = 1:num_frames
    if ismember(i, voiced_frames)
        r = xcorr(frames(i, :));
        r = r(frame_length:end);
        [~, locs] = findpeaks(r, 'MinPeakDistance', round(Fs/f0_max), ...
            'MinPeakHeight', 0.3*max(r));
        [~, loc] = max(r(locs));
        pitch_period(i) = locs(loc);
        f0(i) = Fs / pitch_period(i);
        if f0(i) < f0_min
            f0(i) = 0;
            pitch_period(i) = 0;
        end
    end
end
% 绘制语音信号的频谱图
figure;
spectrogram(s, hamming(frame_length), frame_length-frame_shift, 512, Fs, 'yaxis');
title('Spectrogram');
% 绘制基频和基音周期曲线
figure;
t = (0:num_frames-1) * frame_shift / Fs;
plot(t, f0);
hold on;
plot(t, pitch_period / Fs, 'r');
xlabel('Time (s)');
ylabel('Frequency (Hz) / Period (s)');
legend('Fundamental frequency', 'Pitch period');

请注意，此代码仅为示例，可能需要根据你的具体需求进行修改。