On Tuesday, 14 May 2019 04:24:46 BST Jack wrote: > On 2019.05.13 23:10, tu...@posteo.de wrote: > > Hi, > > > > is it somehow possible to play USB-Audio on a PC without one of these > > USB-dongle-"soundcards" (DACs)? > > > > I searched the web and only got links to those dongles... > > > > On the other hand: On the forum of the developers board one post > > spokes of a "dummy" USB-Audio device... > > > > How can I acchieve this? > > > > Thanks for any help in advance! > > Cheers! > > Meino > > It's not clear what you really want. Why would you want USB audio > without an actual USB audio device? Without a USB audio > dongle/device/whatever, what would you have to actually produce > sound? I can imagine a "dummy" USB audio device - but I can imagine > it for testing the software, but not actually producing any sound, so > why would you want it? > > Jack
As Jack said, a USB connector passes digital signals from your audio source (PC media player) to a USB connected device, which is able to convert the digital signals to analogue audio (DAC chip). Without such a converter you wouldn't be able to hear sound coming out of whatever you connected to the USB port. If you connect USB speakers, a soundbar, USB-C earphones and the like, they all have some DAC converter chip on them to turn the binary USB input into audible sound. There's Class 1 and Class 2 USB audio devices. Class 1 can process up to a maximum of 24-bit/96kHz files, while Class 2 can reach up to 24-bit/192kHz - if you have this quality of audio files. A dummy audio driver pretends it is an audio device for testing the audio on your PC, but it will not produce audio output. I found this page explaining how USB audio works: https://www.edn.com/design/consumer/4376143/Fundamentals-of-USB-Audio -- Regards, Mick
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