Passband ripple and stopband attenuation
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Omar Abdel Deen
le 14 Mar 2021
Commenté : Star Strider
le 25 Mai 2024
Hello ,
I want to know how to select the passband ripple for my signal , does it depend on specific standered to be selected ? does it hava anything to do with the fft ?
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Ali
le 24 Mai 2024
How does changing the passband and stopband attenuation affect the filter's performance?
Star Strider
le 25 Mai 2024
@Ali — If the passband and stopband attenuation values differ significantly, this can result in a very steep transition region, and the filter can exhibit undesirable characteristics. Reducing the difference in the passband and stopband attenuation values can improve filter performance in this instance. Other than that, the only effects are to change the amplitudes of the signal components in the passband and stopband.
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Star Strider
le 15 Mar 2021
Passband ripple (derived from elliptic and Chebychev filters and not strictily applicable to all filter designs, such as Butterworth) is generally set at 1 dB. Stopband ripple or attenuation can be whatever you want it to be (within limits), with usual values being between 50 dB and 100 dB. Note that getting the [z,p,k] outputs of the filter design functions and then using the zp2sos function generally results in a stable filter.
6 commentaires
Star Strider
le 4 Avr 2021
That appears to be correct to me. (For the record, I am a Board-Certified Internal Medicine physician, now retired.)
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