What is the sampling rate for digital CVR? How does it match with computer generated sounds (alarms, chimes, cavallery fanfare...) which are also having their own sampling rate or rectangular waveforms. I never worked with digital audio, do you also have some frequency changes similar to my FRD example, so a sound of 42 kHz sampled at 41 kHz is recorded as a 1 kHz sound?
I think you'll find that even young human ears can't hear anything above 20 kHz. CDs are sampled at 44.1 kHz, over twice the highest perceptible frequency to humans. This ensures lossless recording. This is shown by the Nyqvist-Shannon sampling theorem.
I'd imagine CVRs would use the same principle.