Pulse counting works by generating a narrow, fixed-width square wave pulse at a set point in the received FM signal’s waveform, usually at the zero-crossing point. Since the frequency of the ...

The IC’s built-in soft clipping will limit the volume gain, but we’ll get something that’s ever more like a square wave as we keep passing the signal through further amplification stages.

From that page, we present the sketch in Figure 6. Figure 6 A square wave and its Hilbert transform, bringing about a 90° phase shift of each frequency component of the input signal in its own time ...