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

1 Ansicht (letzte 30 Tage)
tengteng QQ
tengteng QQ am 12 Dez. 2021
Beantwortet: Avadhoot am 14 Feb. 2024
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
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79
78
62
61
60
60
60
60
58
44
70
71
72
72
71
70
66
37
5
3
2
4
74
75
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78
78
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78
77
81
83
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50
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63
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63
56
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59
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65
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65
26
25
50
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54
54
76
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64
69
73
77
79
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85
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90
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90
88
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86
71
70
61
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35
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35
34
67
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72
65
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68
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64
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40
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53
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48
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79
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12
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16
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15
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3
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15
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2
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8
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Antworten (1)

Avadhoot
Avadhoot am 14 Feb. 2024
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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