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Formula For Sampling Frequency. Wayne King on 12 Oct 2012. N f H f H f L n 25 so n 2 maximum Now 2 f H n f s 25 f s so minimum sampling rate will be 25 k H z. Fs 2B Fs 2B Fs 2B. So I need to use the Baseband sampling.
There is a relationship between length of the input signal and the FFT output not the sampling rate. 3 Division by N2. Amplitude 2abs fft signalN. 𝑓 𝐹𝑠 𝑚 𝑚 Note that this approximation works best on input signals with frequency components that are reasonably spread out such as a sine wave square wave or. 12 Hz sinewave and would therefore require greater than 24 Hz sampling rate to preserve the correct frequency in reconstruction. Amplitude abs fft signalN where N is the signal length.
However real-world signals are often more complex.
An input at exactly the sampling rate is standing still as you will. As the signal m t is Baseband signal after modulation it wil be bandpaas signal will look like this. 1 Division by N. However real-world signals are often more complex. Add a guard band of 4kHz and the required minimum sampling rate is 475kHz. In the figure below you see the sampling effects on a sinusoidalsignal of frequency B Hz that result from the use of different samplingfrequencies.