False Clicks in FM Detection

It is shown that the expected number of clicks per second at the output of a conventional frequency modulation discriminator is smaller than the number given by Rice [1]. In any analysis of the discriminator the difference is small, and it does not affect the output signal-to-noise ratio appreciably. However, m the analysis of threshold extending demodulators, which remove a large number of clicks, the difference can become very important. The predicted results are experimentally verified using a simple but novel technique.