I have the following homework question that confuses me:
We have an audio emitter that can emit two signals:
It either emits a sine wave at 23 kHz or it emits a sine wave at 25 kHz.
The receiver has the following sampling frequencies available: 16 kHz, 32 kHz and 48 kHz.
The question asks which is the best sampling frequency for the receiver to know when is 23 kHz being transmitted, and when is 25 kHz is.
The Nyquist criterion states that the sampling frequency should be minimum twice the signal frequency. In this case it should be 50 kHz.
Should I select 48 kHz, or is there a trick?