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Audio via Sound Card Line In and Spectrum Analyzer

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kirk spec:

I just cancelled my Behringer order when I heard about the E1DA Cosmos ADC. It has very low distortion which I need. My signal is mainly human voices, I want to analyze voices so I need very clear reproduction without added distortions.

Why didn't you guys get the E1DA Cosmos ADC as some kind of sound card? How does it differ to a sound card?

Also to evaluate my notebook sound (without any input). First I need to get hold of free PC software audio spectrum analyzers. Please list the free ones that are easy to use and complete. I'm not familiar with Mathlab. Thanks.

noisyee:

--- Quote from: kirk spec on July 12, 2023, 09:47:00 am ---Why didn't you guys get the E1DA Cosmos ADC as some kind of sound card? How does it differ to a sound card?

--- End quote ---

Cosmos ADC doesn't have mic preamp, that mean you just can't plug a mic direct into it. It will not work AT ALL. You will need a separate mic preamp like the Cosmos APU.
The functionality of the Cosmos ADC is more likely a audio ADC evaluation board rather than a commercial sound card.
Some audio hobbyist mainly use it as a distortion meter to test audio amplifier. The distortion of the Cosmos ADC is over killed for most application.

kirk spec:

--- Quote from: noisyee on July 12, 2023, 10:06:45 am ---
--- Quote from: kirk spec on July 12, 2023, 09:47:00 am ---Why didn't you guys get the E1DA Cosmos ADC as some kind of sound card? How does it differ to a sound card?

--- End quote ---

Cosmos ADC doesn't have mic preamp, that mean you just can't plug a mic direct into it. It will not work AT ALL. You will need a separate mic preamp like the Cosmos APU.
The functionality of the Cosmos ADC is more likely a audio ADC evaluation board rather than a commercial sound card.
Some audio hobbyist mainly use it as a distortion meter to test audio amplifier. The distortion of the Cosmos ADC is over killed for most application.

--- End quote ---

I don't need a preamp, because my line out already has about 1 Volt output directly to Line In of the Cosmos ADC.

If the Cosmos ADC has this spec:

THD+N   0.00007% @ 1kHz, @ -5dBFS, SR 48kHz, BTW 20Hz - 20 kHz.

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?

kirk spec:

--- Quote from: kirk spec on July 12, 2023, 10:27:33 am ---
--- Quote from: noisyee on July 12, 2023, 10:06:45 am ---
--- Quote from: kirk spec on July 12, 2023, 09:47:00 am ---Why didn't you guys get the E1DA Cosmos ADC as some kind of sound card? How does it differ to a sound card?

--- End quote ---

Cosmos ADC doesn't have mic preamp, that mean you just can't plug a mic direct into it. It will not work AT ALL. You will need a separate mic preamp like the Cosmos APU.
The functionality of the Cosmos ADC is more likely a audio ADC evaluation board rather than a commercial sound card.
Some audio hobbyist mainly use it as a distortion meter to test audio amplifier. The distortion of the Cosmos ADC is over killed for most application.

--- End quote ---

I don't need a preamp, because my line out already has about 1 Volt output directly to Line In of the Cosmos ADC.

If the Cosmos ADC has this spec:

THD+N   0.00007% @ 1kHz, @ -5dBFS, SR 48kHz, BTW 20Hz - 20 kHz.

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 ---

It looks like the E1DA Cosmos ADC are already sold out everywhere?

https://www.linsoul.com/products/e1da-cosmos-adc?variant=42117413142745

They discontinued it somehow? Why?

If I get one and connect it to spectrum analyzers, I can get output in real time with the real time input, right?

radiolistener:

--- Quote from: kirk spec on July 12, 2023, 03:26:53 am ---I want my analog audio to be inputted into a PC spectrum analyzer software. What is the best sound card/interface/system that can do this with minimal distortion? Is this related to Total Harmonic Distortion? I don't want the frequency of the original analog audio to be altered. So I want it to pass through the line in and into the PC software itself. If the recording quality of a sound interface or card is good. Does it automatically mean the Line In audio would be good too. What is the relationship between recording and pass through (what is the right term?)

And what sound card/interface/system can you recommend?  Thank you.

--- End quote ---

if you don't want to original signal frequency be altered, you're needs sound card with ADC that has good enough dynamic range and linearity.

The main parameters which you needs to check is dynamic range (SNR), third-order intermodulation distortion (IMD3) and total harmonic distortion (THD).

For a good result you're needs to use professional sound card with very high dynamic range, usually they based on modern 24 or 32 bit ADC which SNR reaching up to 120 dB and even better.

For example, if you don't expect very expensive top performance, Creative E-MU 1212M is a good working horse with 24-bit ADC.

Avoid soundcard with switching mode DC/DC converters, because they have noise. Also avoid cheap portable USB sound card because they have dirty power and bad filtering and shielding

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