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Which among the following is not a component of hardware defined radio?

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Which among the following is not a component of hardware defined radio?

(a) Demodulator

(b) Antenna

(c) Filters

(d) Analog to digital converter

The question was posed to me during an interview.

I need to ask this question from Building CRA on SDR Architecture topic in chapter Cognitive Radio Architecture of Cognitive Radio

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The correct choice is (d) Analog to digital converter

The explanation is: A typical hardware defined radio used as a frequency modulated/ amplitude modulated broadcast receiver consists of radio hardware such as antenna, filters, and demodulators. The primary function is the conversion of radio signals into audio signals.

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