96kHz Investigation
Does content above 20kHz produce anything audible?
Check for 96kHz sample rate
96kHz has been set, but sample-rate-conversion may happen if the interface is being shared.
Start testing
Great, you have audio above audio range.
Now test the audibility of some high frequency content audio files.
Test Waves Setup
Selection of sampled waveform to use as reference.
Reference
Test Wave 1 - Single Tone
First test wave, adds a single sine wave at the specified frequency. Investigate basics of audibility and intermodulation.
Test Wave 2 - Double Tone
Second test wave, adds two sine waves at the specified frequencies. Investigate more complex intermodulation components.
Test Wave 3 - Noise
Third test wave, adds noise to the signal above the ultrasonic threshold set below.
Test Wave 4 - Saturation
Fourth test wave, creates harmonics using Tanh distortion of the signal, added above the ultrasonic threshold set below.
High-Pass
The noise and distortion test waves are synthesised by high-pass filtering the added components and mixing them in with the reference sample.
Preview:
FFT of Input
Test your interface
Connect the input of your sound interface to the output and monitor the test signal.
You can do this by:
- Using the software mixer for the interface.
- Using a cable to connect the output to the input.
- Using an external mixer or microphone.
FFT of Output
FFT of Input
For a valid test, you should see sound well over 20Khz and ideally up to 40kHz.