When ____ of N zero crossings count becomes small, a signal is considered to be present.(a) mean(b) correlation(c) standard deviation(d) varianceI have been asked this question by my school teacher while I was bunking the class.The doubt is from RF and IF Processing Tradeoffs in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio

When ____ of N zero crossings count becomes small, a signal is conside

1.	When ____ of N zero crossings count becomes small, a signal is considered to be present.(a) mean(b) correlation(c) standard deviation(d) varianceI have been asked this question by my school teacher while I was bunking the class.The doubt is from RF and IF Processing Tradeoffs in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» Right answer is (d) variance Easiest explanation: When ZERO crossings are simply counted, a small variance of N zero crossings indicate a SIGNAL to be present. A disadvantage of this technique is the PRESENCE of HIGH speed logic and LACK of equalization.

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