Normalizing frequency for fir1() matlab function:??

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Kapal
Kapal 2016-7-18
评论： Star Strider 2022-9-22
I am trying to implement an FIR low pass filter using fir1() function but I am confused in normalizing the frequencies.Whether I had to divide my frequencies by fs or fs/2 for normalization to be used as Wn. Which one will give me the correct results?

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Star Strider
Star Strider 2016-7-18
Always normalise by the Nyquist frequency, in your example ‘fs/2’ if ‘fs’ is your sampling frequency.
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Merve ozdas
Merve ozdas 2022-9-21
why should I use normalization for the cut off frequency?
Star Strider
Star Strider 2022-9-22
@Merve ozdas — Simply because that is the way digital filters are specified and designed. The normalised frequency extends on the interval from 0 (D-C) to π radians/unit (units can be seconds, millimetres, parsecs, or whatever) defining the interval from D-C to the Nyquist frequency. The Nyquist frequency is the highest uniquely identifiable frequency in a sampled signal, and is one-half of the sampling frequency.

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