As I wrote: My USB device is capable of one sample rate only, and that is the sample rate of the incoming digital audio stream.įYI: When this sample rate changes, the device disappears and a different USB audio device appears which, of course, is capable of nothing but the new sample rate. ![]() Thus the box is grayed out and there is nothing to select or set up. In System Tray > Recording Devices > Recording > Properties > Advanced > Default Format only one sample rate is available, which is in this case 2 channels, 24 bit, 96000 Hz. Now I learned the background of it and that a solution comes into sight - but just before it is completely working it fails at 96 kHz. So we were convinced that with Audacity (provided, that the correct project rate is selected) we will definitely always get a 1:1 recording from the audio source - and we were deeply disappointed when we just recently found out that under Windows (in contrast to OS X) the samples were truncated to 16 bit and obviously dithered. There is nothing that you can set up wrong in any driver. This device determines (counts) the external sample rate and logs on to the PC as a UAC1 (or, in case, UAC2) device which is capable of nothing else but that external sample rate. There are basically two ways the “recording device” determines the incoming sample rate: Maybe it helps somebody to solve the 96 kHz issue. 96 kHz/24 bit when no external digital audio signal is connected. We can easily program it so that it sends a test signal of e.g. Meanwhile I can offer it as a kind of kit for DIYs, too. I expected this question… Because I never saw such a device myself but needed one for a product, a friend of mine (software) and I (hardware) designed it. Out of curiosity: what device are you using to record? ![]() In case there is just a source for such a signal missing, I can possibly help. Maybe somebody cared for Windows 24 bit but didn’t expect that somebody would come up and ask for 24 bit not only at 48 kHz, but also at 96 kHz. There may be another WASAPI mode that allows upsampling, but I don’t know how to set that up and of course there is no audio benefit to doing that. Note that on MACs happens exactly what I describe here (e.g., 96 kHz and all 24 bit) and that on Windows in MME mode also 96 kHz, but truncated to 16 bit, are working. And because my USB interface is only capable of the incoming data rate, the UAC1 driver’s output can only be the same as the input. This UAC1 driver is capable of up to 96 kHz with 24 bit or 192 kHz with 16 bit. The driver is the Windows internal USB Audio Class 1 (UAC1) driver, not a propriety one. “Normal” windows drivers take care of any conversion and pretty much hide the hardware capabilities/limits I.e., it always runs exactly at the clock of the audio source. ![]() This USB interface is a digital-audio-to-USB adapter (either S/PDIF- or Toslink-to-USB) which is capable one direction only and nothing but the sample rate of the incoming digital audio signal. It’s not a soundcard, it’s an external USB interface (possibly also called a “soundcard”). I THINK that means your soundcard only runs at 48kHz internally
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