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RE: Sounds that cannot be heard?

135.245.10.2

Say two sound sources: A and B, both generated pure tones above 20 kHz at frequency f(A) and f(B), respectively. For most people, if you play one source at time, they will not be able to hear.

Now if you play two sources A and B at same time, then they one can hear. The superposition of f(A) and f(B) can form a wave at fundamental freq below 20 kHz. There are three parameters in each f, called amplitude, phase and frequency. For these two sources, if you vary those 6 parameters, you can hear various tones.

Now if there are 10 instruments played in the stage that output some harmonics modes above 20 kHz, that catched by mic in recording….. this is why you need your system to reproduce those higher freq modes….

Hope this is helpful.


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