Question

Define nyquist rate and nyquist interval

Answer 1

Nyquist interval: The maximum timeinterval between equally spaced samples of a signal that will enable the signal waveform to be completely determined. (188) Note 1: The Nyquist interval is equal to the reciprocal of twice the highest frequency component of the sampled signal. Note 2: In practice, when analog signals are sampled for the purpose of digital transmission or other processing, the sampling rate must be more frequent than that defined by Nyquist's theorem, because of quantization error introduced by the digitizing process. The required sampling rate is determined by the accuracy of the digitizing process.

Nyquist Rate is the minimum sampling frequency needed to detect the original signal without distortion. eg in your case fmax=150+250=400Hz. Thus N.R. should be 800 Hz.

The maximum time interval between equally spaced samples of a signal that will enable the signal waveform to be completely determined. The Nyquist interval is equal to the reciprocal of twice the lowest frequency component of the sampled signal.ie. in our case fmin=250–150=100Hz. Thus NI should be 0.05s.

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