I’m currently doing some tests to evaluate Pisound + RPI3 self noise in the following setting:
Input: IN jack, mono recording (nothing connected for this test)
FS: 192 kHz
Gain potentiometer set to the minimum
I noticed some emerging noises:
1 ray @ ~31kHz
Increasing noise from 48kHz up to 96kHz. The noise floor is around -74dB @ 48kHz and -45dB @ 96kHz.
Pisound + RPI3 noise floor FFT
I tried several power sources and different test environments but those noises are always present on my signal.
Are those noises normal?
Many thanks by advance for your help.