How to control the stopband attenuation of the resample function ?

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?

Answer 1

[Vaishnav Katiyar]

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