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What is the frequency of the stereo sub carrier signal in FM broadcasting?

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What is the frequency of the stereo sub carrier signal in FM broadcasting?

(a) 19 KHz

(b) 45 KHz

(c) 55 KHz

(d) 38 KHz

This question was addressed to me in an interview for job.

My enquiry is from Comparison Between FM and PM in chapter Noise of Analog Communications

1 Answer

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Correct answer is (d) 38 KHz

Explanation: Stereo broadcasting is made possible by using a subcarrier on FM radio stations, which takes the left channel and “subtracts” the right channel from it. A subcarrier is basically a sideband of a radio frequency carrier wave, which is modulated to send additional information. The frequency set for stereo sub carrier signal in FM broadcasting is 38 KHz.

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