(TCO 4) A signal consists of only two sinusoids, one of 65 Hz and one of 95 Hz. This signal is sampled at a rate of 245 Hz. Find the first six positive frequencies that will be present in the replicated spectrum.

65 Hz, 95 Hz, 150 Hz, 180 Hz, 310 Hz, 340 Hz

Explanation:

Given :

Frequencies of the sinusoids,

,  and

Sampling rate

The positive frequencies at the output of the sampling system are :

When n = 0,

when n  = 1,

When n = 2,

Therefore, the first six positive frequencies present in the replicated spectrum are :

65 Hz, 95 Hz, 150 Hz, 180 Hz, 310 Hz, 340 Hz

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

the part of the wave he is travelling on is the crest