AudioScope
Why Does 6 kHz Sound Like 2 kHz?
Listen to the original tone, then hear what happens when it is sampled too slowly.
Hear the pitch drop
At 8,000 samples per second, the Nyquist limit is 4 kHz. In this model, a 6 kHz tone above that limit produces samples consistent with a 2 kHz tone of the appropriate phase. Filtering before sampling helps prevent this.
Original AudioScope simulation. Start at a comfortable volume. Read more about sampling and aliasing.
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