Stopband

Find Stopband Edge Frequency

Find Stopband Edge Frequency
  1. How do you find the stopband edge frequency?
  2. What is the stopband frequency?
  3. How is stopband attenuation calculated?
  4. What is the frequency range of passband and stopband?

How do you find the stopband edge frequency?

In general there is no standard way to calculate the stop band edge, other than specifying a desired stop band attenuation and checking at which frequency this attenuation is first attained (for a low pass filter).

What is the stopband frequency?

A stopband is a band of frequencies, between specified limits, through which a circuit, such as a filter or telephone circuit, does not allow signals to pass, or the attenuation is above the required stopband attenuation level.

How is stopband attenuation calculated?

The stopband attenuation is the difference, in decibels, between the lowest gain in the passband and the highest gain in the stopband. Ideally this would be infinite; the higher the better.

What is the frequency range of passband and stopband?

Let us design a lowpass filter having the following specifications: passband response = 0.1 dB, passband frequency = 1200 Hz, stopband attenuation = 30 dB, stopband frequency = 2200 Hz, and sampling rate = 8000 Hz.

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