Howtosignalprocessing
Ripples are the fluctuations (measured in dB) in the pass band, or stop band, of a filter's frequency magnitude response curve. Elliptic and Chebyshev-based filters have constant ripple across their pass bands. While Bessel and Butterworth derived filters have no ripple in their pass band responses.
- What does passband ripple do?
- What is an acceptable passband ripple?
- What do you mean by pass band?
- What is passband and stopband?
What does passband ripple do?
In many applications, you can allow the gain in the passband to vary slightly from unity. This variation in the passband is the passband ripple, or the difference between the actual gain and the desired gain of unity.
What is an acceptable passband ripple?
A ripple of 0.5% is a often good choice for digital filters. This matches the typical precision and accuracy of the analog electronics that the signal has passed through. The Chebyshev filters discussed in this chapter are called type 1 filters, meaning that the ripple is only allowed in the passband.
What do you mean by pass band?
A passband is the range of frequencies or wavelengths that can pass through a filter. For example, a radio receiver contains a bandpass filter to select the frequency of the desired radio signal out of all the radio waves picked up by its antenna.
What is passband and stopband?
Q: What is the passband and the stopband? A: Passband is the band of frequencies of the input signal that passes through the filter with an attenuation of less than 3 dB attenuation, while stopband is a band of frequencies of the input signal that are blocked or more highly attenuated by the filter.
