how to calculate normalized frequency for frequency sweep ?

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guduguntla sai shankar 2016-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/282022-how-to-calculate-normalized-frequency-for-frequency-sweep

评论： Gautam Mohan 2016-5-4

Hello everyone, I need some help regarding normalized frequency calculation.

I will explain my basic proble now. I have designed an IIR filter(Lowpass and Bandpass) in matlab script and I am giving a frequency sweep of 10KHz to 1MHz sine wave in simulink as input to this IIR filters. Inorder to get linear phase for this IIR filters I need to cascade my IIR filters with an AllPass filter.

Now for calculating this allpass filter coefficients I need to calculate normalized frequency. Generally Normalized frequency will be calculated for single frequencies but how to calculate it for a frequency sweep?

My sampling frequency is 10MHz.

Any help will be appreciated.

Thanks in advance.

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Gautam Mohan 2016-5-4

Hi Guduguntla,

To calculate the normalized frequency of a sweep, we just need to normalize the bounds of the sweep. Remember that Fn = Fr/Fs, where Fn = normalized frequency, Fr = real-valued frequency, and Fs = sampling frequency.

If we apply the bounds of 10KHz and 1MHz to this formula, we get that you should sweep from the normalized frequencies of 0.01 to 0.1.

Hope this helps!

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