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| Audio via Sound Card Line In and Spectrum Analyzer |
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| kirk spec:
--- Quote from: noisyee on July 13, 2023, 01:46:27 am --- --- Quote from: kirk spec on July 12, 2023, 10:27:33 am ---And it's at $150. Why can't other sound cards more expensive match the spec? And if you have Line Out already without needing any Mic preamp Why can't hobbyists use it as sound card/interface at all? --- End quote --- Cosmos ADC use a new released ESS ES9822, while other sound cards use very old AKM, CirrusLogic, or TI parts. It will take a long time for a new part to hit the market. Also the ES9822 is quite expensive, don't expect it appear on a cheap sound card. Most hobbyists would use their sound card. Like I said, the Cosmos ADC is over killed for most application, so only those guys who are really serious about THD but can't afford the expensive Audio Precision would use Cosmos ADC. --- End quote --- What is the equivalent of the E1DA Cosmos ADC in the Data Acquisition Devices (DAQ) world? Does DAQ need also very flat THD? And if DAQ has flat THD the same as the Cosmos ADC, then the DAQ can equally work for audio too? |
| uktony:
After a lot of testing and experimentation, I'm currently using an Asus Xonar STX card for audio testing. The Asus Xonar DX is a lot cheaper and also gives very good measurements. Another ADC I'm using is an Olivine 2 from Altor Audio which is useful for portable measurements (it's a USB device with isolation) https://www.altor.co/products/test-equipment/olivine-2-adc There are other better options out there, such as the E1DA Cosmos ADC mentioned previously in this thread. I built a front end buffer / gain stage which plugs into the input of my sound card (and also provides a measure of protection for the sound card) and I use a custom built Crystal CS 4398 DAC as a signal generator, using the WaveGene signal generator software. The software I use for measurements is WaveSpectra and Virtins Multi Instrument. It's all documented on my website here -> https://gtkc.net/audio-test-and-measurement-for-diy I hope this info is useful. This is a screenshot of Virtins Multi Instrument software, showing a typical measurement. |
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