Comment by FrankBooth
14 years ago
I tried this in Audacity, with the project set to 96kHz and two tones at 25kHz and 28kHz. I couldn't hear either of the tones individually, but I could hear a tone when played together. This is on Windows 7 with the sound card configured for 24-bit/48kHz. Am I running into resampling artifacts somewhere in the chain?
EDIT: it turns out Audacity won't generate a tone above 20kHz (the UI accepts the value, but when you reopen it the value has been rounded down), so both of my generated tones were actually 20kHz.
I tried this with 19kHz and 20kHz. Couldn't hear any of them on their own, but very clearly together.
EDIT: You can generate higher than 20kHz by increasing the pitch of a tone lower than 20kHz. Upon doing this, I could hear 24kHz and 26kHz together.