# Design FIR filter to separate signals

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Tu Nguyen le 19 Avr 2022
Réponse apportée : Nithin le 31 Oct 2023
Dear all,
I have a data have 2 signals, how can I design a fir filter and iir filter to seperate the left signal alone.
Thank you so much for your help
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### Réponses (1)

Nithin le 31 Oct 2023
Hi Tu,
I understand that you want to design FIR and IIR filters to separate the left signal alone.
To implement this, kindly refer to the following steps:
1. Input your data: Load your data containing the two signals.
2. Design FIR Filter: Decide on the filter specifications, such as filter type, filter order, and cutoff frequency and use the fir1 function to design a FIR filter as shown in the following code snippet:
filterOrder = 50;
cutoffFrequency = 0.2;
fir_filter = fir1(filterOrder, cutoffFrequency);
3. Filter the Data: Apply the designed FIR filter to your data to separate the left signal:
left_signal = filter(fir_filter, 1, your_data);
4. Design IIR Filter: Decide on the filter specifications for the IIR filter and use the “butter” function to design an IIR filter.
[b, a] = butter(filterOrder, cutoffFrequency, 'low');
5. Filter the Data: Apply the designed IIR filter to your data.
left_signal_iir = filter(b, a, your_data);
For more information regarding “fir1”, “butter” and “filter” functions, kindly refer to the following documentation:
I hope this answer provides you with the required information regarding your query.
Regards,
Nithin Kumar.
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