How to control the stopband attenuation of the resample function ?

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Abdelwahab Afifi 2020-10-24

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https://ww2.mathworks.cn/matlabcentral/answers/624913-how-to-control-the-stopband-attenuation-of-the-resample-function

回答： Vaishnav Katiyar 2020-10-27

I'm using resample function to upsample my data. I need to increase the stop band attenuation to improve the Adjacent channel power ratio (ACPR) . How can i do that?

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Answer 1

Vaishnav Katiyar 2020-10-27

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https://ww2.mathworks.cn/matlabcentral/answers/624913-how-to-control-the-stopband-attenuation-of-the-resample-function#answer_525418

This example shows how to design a minimum-order lowpass FIR filter with a passband frequency of 0.37*pi rad/sample, a stopband frequency of 0.43*pi rad/sample (hence the transition width equals 0.06*pi rad/sample), a passband ripple of 1 dB and a stopband attenuation of 30 dB.

Fpass = 0.37;

Fstop = 0.43;

Ap = 1;

Ast = 30;

d=

designfilt('lowpassfir','PassbandFrequency',Fpass,'StopbandFrequency',Fstop,'PassbandRipple',Ap,'StopbandAttenuation',Ast);

Refer the article below for more details on designing FIR and IIR filters based on frequency response specifications using the designfilt function in the Signal Processing Toolbox® product.

Practical Introduction to Digital Filter Design