Question about Lands Phones
Q no1) A signal of frequency 4 Kz is sampled at the rateof 3500Hz .What will be the effect on the signal and signal frequency ?
Please show the solution with the help of "MATHEMATICAL CALCULATION" and "RAY DIAGRAM" using sine wave.
Posted on Feb 22, 2008
The signal and signal frequency remain unchanged. In this context, these terms refer to the incoming, and not resultant, aspects of the system.
However, because the Nyquist frequency (1.75kHz, or half the sampling rate) is not greater than the signal bandwidth (4kHz), aliasing will be introduced into any reconstructed signal that is based on these samples. Not enough data about the signal has been captured to be able to recreate it in its original form.
If the signal is very simple (a sine wave, for instance), the "apparent frequency" of the result can be calculated without too much trouble. A more complex signal (i.e. a voice signal with a bandwidth of 4kHz) presents more analysis problems.
I suggest you read your textbook for further information.
Posted on Feb 14, 2008
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Posted on Jan 02, 2017
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