How can I implement lowpass filter on matrix (1885*1)

3 次查看（过去 30 天）
tengteng QQ
tengteng QQ 2021-12-12
回答： Avadhoot 2024-2-14
Dear all, May i ask a question about how to implement lowpass filter on matrix A (1885*1). I try lot of way to make a lowpass filter, but it is not work. Thank you for helping me!!
A=
90
88
86
85
84
82
81
79
79
79
78
62
61
60
60
60
60
58
44
70
71
72
72
71
70
66
37
5
3
2
4
74
75
76
77
78
78
78
78
77
81
83
84
84
84
85
95
97
98
98
98
98
98
97
95
86
76
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76
74
74
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75
75
78
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79
78
77
73
73
73
72
71
69
68
65
64
78
78
50
51
51
63
64
65
64
63
56
56
59
59
65
65
65
26
25
50
52
53
54
54
54
76
76
64
69
73
77
79
80
85
86
87
90
91
91
90
88
88
88
88
87
86
71
70
61
61
62
62
62
61
60
59
58
58
59
59
59
35
35
35
34
67
68
70
72
73
74
74
74
73
72
65
65
66
68
70
71
72
73
74
74
74
73
72
71
72
73
73
73
72
71
64
63
61
60
62
63
64
64
65
65
65
65
64
63
40
40
38
53
55
56
48
47
47
49
51
54
55
56
56
55
55
56
56
55
55
54
54
53
53
54
55
56
58
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59
56
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51
50
34
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35
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52
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47
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54
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59
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68
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60
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63
65
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53
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51
60
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61
57
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57
57
46
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48
54
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58
60
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58
55
46
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51
45
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59
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64
58
51
50
55
55
55
58
60
61
61
61
61
61
60
59
60
61
61
61
61
62
61
60
79
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81
80
79
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75
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72
71
69
47
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51
51
55
57
58
58
59
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60
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60
59
58
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57
55
53
49
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47
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42
57
59
60
62
63
64
63
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63
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61
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56
55
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50
47
53
53
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60
59
58
56
45
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26
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34
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28
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61
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52
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57
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45
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57
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65
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71
70
68
65
62
55
35
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30
25
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26
34
35
40
44
45
46
46
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46
45
45
50
51
52
53
52
51
19
18
17
51
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51
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39
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56
64
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58
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35
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15
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55
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32
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24
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25
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30
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31
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24
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12
25
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26
25
32
35
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40
40
40
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36
33
16
29
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30
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19
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13
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29
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35
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15
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29
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29
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3
3
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10
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19
15
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2
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18
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15
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2
2
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17
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8
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6
4
2
2
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2
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回答（1 个）

Avadhoot
Avadhoot 2024-2-14
Hi,
I infer from your question that you want to apply a lowpass filter on your 1885x1 matrix. This can be accomplished fairly easily in MATLAB using the function "designfilt". There are two steps to apply a filter on your data. They are as follows:
1. Design the filter: First you need to design the filter by specifying the required properties like the sampling frequency, cutoff frequency and the filter order. A sample filter design can be as follows:
Fs = 1000; % Sampling frequency in Hz (you will need to set this according to your data)
Fc = 50; % Cutoff frequency in Hz
order = 5; % Filter order (you can adjust this as needed)
% Design a low pass filter using a Butterworth design
lpFilt = designfilt('lowpassfir', 'FilterOrder', order,'CutoffFrequency', Fc, 'SampleRate', Fs);
2. Apply the filter: You can use the "filter" function to apply the lowpass filter to your data. The following code is an example of how you can do it:
filteredData = filter(lpFilt, A);
More information about the above mentioned functions can be found in the below documentation:
  1. "designfilt" function: https://www.mathworks.com/help/dsp/ref/designfilt.html
  2. "filter" function: https://www.mathworks.com/help/matlab/ref/filter.html
I hope it helps.

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