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.

[Dana Massie]

I have exactly the same error message from the same code. Running R2024a.

Answer 2

[Paul]

As shown at designMultistageDecimator, this function retruns a dsp.FilterCascade object

M = 48;
Fin = 30.72e6*M;
Astop = 90;
BW = 1e7;
Fc = Fin/(2*M);
TW = 2*(Fc-BW);
c = designMultistageDecimator(M,Fin,TW,Astop)

c = 
  dsp.FilterCascade with properties:

         Stage1: [1x1 dsp.FIRDecimator]
         Stage2: [1x1 dsp.FIRDecimator]
         Stage3: [1x1 dsp.FIRDecimator]
         Stage4: [1x1 dsp.FIRDecimator]
    CloneStages: false

This object does not have a filter method.

methods(c)

Methods for class dsp.FilterCascade:

FilterCascade               freqrespopts                info                        isreal                      phasedelay                  step                        
addStage                    freqz                       isFilterCascade             issos                       phasez                      stepz                       
cascade                     freqzmr                     isLocked                    isstable                    realizemdl                  tf                          
clone                       generateFilteringCode       isallpass                   measure                     release                     zerophase                   
coeffs                      generatehdl                 isequal                     noisepsd                    releaseStages               zpk                         
cost                        getNumStages                isfir                       noisepsdopts                removeStage                 zplane                      
fdhdltool                   grpdelay                    islinphase                  order                       reset                       
firtype                     impz                        ismaxphase                  outputDelay                 specifyall                  
freqrespest                 impzlength                  isminphase                  parallel                    ss                          

Static methods:

helpFilterAnalysis          helpSupportedSystemObjects  

Call "methods('handle')" for methods of dsp.FilterCascade inherited from handle.

Instead, operate on an input by use the object like a function call, as shown at dsp.FilterCascade

u = rand(4800,1);
y1 = c(u);

Reset the object to use again from scratch

reset(c);
y2 = c(u);
isequal(y1,y2)

ans = logical
   1