USB ADC products are common. An example of such a product is a box that converts the output of a phono cartridge into a stream that a computer can capture via a USB connection between the box and the computer. A USB Audio Sound Card on the analog-input side is essentially an ADC.
To test a USB ADC, the QA403 needs to get access to the data flowing into the computer. The ADC’s analog input would be connected to the QA403 generator. With the digital data from the USB ADC, the QA403 could show spectra and run scripts.
For USB DACs, the QA403 has mirror mode. Does an equivalent function exist when the USB data flows in the opposite direction from the USB ADC digital output to the computer, and then the data would be routed from the computer to the QA403 via the USB cable connecting them?
Hi @DavidR, the issue with the 1.x software is that the analyzer engine only works with the QA403 hardware. It cannot take input from another ADC. It can mirror the output of the analyzer engine, but only for sines. As previously noted, this gets fixed for 2.0. But in the interim, you can use something like ASIO for the QA403 hardware and then use REW or other software to do the measurement.
I will wait for your 2.0 software for the QA403. I do not want to work with REW and the special ASIO drivers.
It sounds like all I need is the 2.0 software to test USB audio interface devices on the ADC and DAC sides with the QA403.
A couple of years ago, you mentioned that a QA404 was to be produced. That had S/PDIF coax in and out. With USB connectivity, I do not need that. You mentioned that the QA404 would offer better protection against overvoltage. Is anything else planned for the QA404?