O'Reilly logo

Signals and Systems by Smarajit Ghosh

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

1.15 ALIASING

The phenomenon of aliasing occurs if the sampling frequency is less than the Nyquist rate. If sampling rate is less than or greater than the Nyquist rate, it is called under sampling or over sampling. Aliasing phenomenon occurs only for under sampling.

Consider a continuous signal in the time and frequency domain shown in Fig.1.33.

 

Continuous signal in the time and frequency domain

 

Fig. 1.33 Continuous signal in the time and frequency domain

 

If the sampling frequency is too low the frequency spectrum overlaps, and becomes corrupted as shown in Fig. 1.34.

 

Aliasing

 

Fig. 1.34 Aliasing ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required