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Application of multistage decimator filter to signal

조회 수: 1 (최근 30일)
Paramonte
Paramonte 2024년 3월 4일
댓글: Cláudio Jorge 2024년 3월 5일
Dear all
We had a piece of code to decimate data (decimation ratio (dec_factor) > 13) that read:
Hfd=fdesign.decimator(dec_factor,'Nyquist');
Hm=design(Hfd,'multistage');
signal_output=filter(Hm,signal_input);
Matlad is warning that
Warning: Multistage design using fdesign.decimator will be removed. Use designMultistageDecimator instead.
So we are replacing the codewith:
Astop = 80;
TW = 0.03*fs_sampling/2;
Hm=designMultistageDecimator(dec_factor,fs_sampling,TW,Astop,'CostMethod','design');
We don´t know what to do with Hm in order to apply the filter to get signal_input.
Any ideas?
Thanks in advance

답변 (1개)

Manikanta Aditya
Manikanta Aditya 2024년 3월 5일
이동: Mathieu NOE 2024년 3월 5일
The 'designMultistageDecimator' function in MATLAB returns a multistage decimator object, which you can use to filter your signal. The returned object 'Hm' is a multistage decimator object, and you can use it just like you used the 'Hm' object in your previous code.
Here’s how you can apply the filter to your signal:
signal_output = filter(Hm, signal_input);
This line of code applies the multistage decimator filter Hm to your input signal signal_input, and stores the result in 'signal_output'.
So, your complete code would look like this:
Astop = 80;
TW = 0.03*fs_sampling/2;
Hm = designMultistageDecimator(dec_factor, fs_sampling, TW, Astop, 'CostMethod', 'design');
signal_output = filter(Hm, signal_input);
  댓글 수: 3
Manikanta Aditya
Manikanta Aditya 2024년 3월 5일
Good morning,
The error message suggests that the filter function is not receiving the expected number of input arguments. This is because the 'signal_input' variable not being defined or accessible in the scope where the filter function is called.
Please ensure that 'signal_input' is defined and contains the signal data you want to decimate.
If 'signal_input' is defined in a different function or script, you might need to pass it as an argument or declare it as a global variable. If 'signal_input' is supposed to be loaded from a file, make sure the file loading operation is successful and the data is correctly assigned to 'signal_input'.
Thanks!
Cláudio Jorge
Cláudio Jorge 2024년 3월 5일
Thank you for your response.
I will incorporate a portion of the signal we're utilising, enabling to observe the errors that we had:
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dec_factor=50;
fs_sampling=200;
Astop = 80;
TW = 0.03*fs_sampling/2;
Hm = designMultistageDecimator(dec_factor, fs_sampling, TW, Astop, 'CostMethod', 'design');
signal_output = filter(Hm, signal_input);
Error using filter
Not enough input arguments.
Thanks in advance.

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