On Tue, 31 Jul 2018 11:01:32 +0200, Jean-Michaël Celerier wrote: >Do you have a source for this ? Yesno! Actually I'm the source, since I worked as a professional audio engineer for e.g. Brauner Microphones, Werner Nekes and other. However, perhaps you expect something as the below quoted Wikis: "Sampling rate 48,000 Hz The standard audio sampling rate used by professional digital video equipment such as tape recorders, video servers, vision mixers and so on. This rate was chosen because it could reconstruct frequencies up to 22 kHz and work with 29.97 frames per second NTSC video - as well as 25 frame/s, 30 frame/s and 24 frame/s systems. With 29.97 frame/s systems it is necessary to handle 1601.6 audio samples per frame delivering an integer number of audio samples only every fifth video frame.[9] Also used for sound with consumer video formats like DV, digital TV, DVD, and films. The professional Serial Digital Interface (SDI) and High-definition Serial Digital Interface (HD-SDI) used to connect broadcast television equipment together uses this audio sampling frequency. Most professional audio gear uses 48 kHz sampling, including mixing consoles, and digital recording devices." - https://en.wikipedia.org/wiki/Sampling_(signal_processing)#Sampling_rate "To avoid aliasing, the input to an ADC must be low-pass filtered to remove frequencies above half the sampling rate. This filter is called an anti-aliasing filter, and is essential for a practical ADC system that is applied to analog signals with higher frequency content." - https://en.wikipedia.org/wiki/Analog-to-digital_converter#Sampling_rate An audio device might come with a filter optimized for 48KHz usage.