2. A signal to be analyzed has been collected in a digital form. From informatio

Question

2. A signal to be analyzed has been collected in a digital form. From information obtained from the signal source the max frequency present is 780 Hz. The person doing the analysis, however, only knows that the frequency range is about 0 to about 1000 Hz. Amplitude-frequency analysis shows that the following frequencies are present: 780 Hz and 220 Hz. Identify any alias frequencies samples/sec, which, according the definition we are using, sample rate must be at least 2*max signal frequency. present in the analyzed signal. Sample rate chosen by the analyst is 2000 (a) With max frequency [1000 Hz] noted above as the signal frequency, what, if any, alias frequencies are estimated? (b) What does the analyst do to determine which is the alias and then eliminate it from the spectrum?

Explanation / Answer

(a)As the sampling frequency is equal to twice the maximum frequency there will be no aliasing so no alias frequency would be present.

(b) As there is no alias frequency so no need for elimination.

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