请编写pan_tompkin函数
时间: 2024-02-22 11:00:34 浏览: 23
Pan-Tompkins算法是一种常用的心电图(QRS)信号处理算法,用于检测心电图信号中QRS波形的位置。以下是一个简单的MATLAB实现pan_tompkin函数:
```matlab
function [qrs_locs, qrs_peaks] = pan_tompkin(ecg_signal, fs)
% This function implements the Pan-Tompkins algorithm for detecting QRS complexes in ECG signals.
% Input:
% ecg_signal: ECG signal (single lead)
% fs: Sampling frequency of the ECG signal (in Hz)
% Output:
% qrs_locs: Location of the detected QRS complexes (in samples)
% qrs_peaks: Amplitude of the detected QRS complexes (in mV)
% Filter the ECG signal using a bandpass filter
[b, a] = butter(2, [5 15]/(fs/2), 'bandpass');
ecg_signal = filter(b, a, ecg_signal);
% Differentiate the filtered signal
diff_signal = diff(ecg_signal);
% Square the differentiated signal
sq_diff_signal = diff_signal .^ 2;
% Integrate the squared signal using a moving window
win_size = round(fs/2);
int_signal = movmean(sq_diff_signal, win_size);
% Find the peaks in the integrated signal
[qrs_peaks, qrs_locs] = findpeaks(int_signal);
% Remove peaks that are too close to the edges
min_dist = round(fs/3);
qrs_locs(qrs_locs < min_dist) = [];
qrs_locs(qrs_locs > length(ecg_signal) - min_dist) = [];
end
```
该函数接受两个输入参数:ECG信号和采样频率。它首先使用5-15Hz的带通滤波器对ECG信号进行滤波,然后对滤波后的信号进行差分、平方和移动平均积分,最后在积分信号中寻找QRS波峰。函数输出两个向量,一个是QRS波峰的位置,另一个是QRS波峰的幅值。请注意,此实现仅适用于单导联ECG信号。