Application of multistage decimator filter to signal

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

Answer 1

[Manikanta Aditya]

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);

[Cláudio Jorge]

Good morning,

Upon running this code, I encounter the following error:

Error using filter

Not enough input arguments.

Error in decimation_v1 (line 89)

signal_output =filter(Hm, signal_input);

Thanks

[Manikanta Aditya]

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]

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.