Products > Test Equipment

Audio via Sound Card Line In and Spectrum Analyzer

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Fungus:

--- Quote from: radiolistener on July 12, 2023, 10:55:17 am ---For example, if you don't expect very expensive top performance, Creative E-MU 1212M is a good working horse with 24-bit ADC.

--- End quote ---

Not going to fit in his Microsoft Surface.  :)


--- Quote from: kirk spec on July 12, 2023, 08:26:59 am ---I just want a rough idea how the USB Hub is able to route the power from the external mini-usb adaptor to one of the USB slot when the slot is already getting power from the notebook USB? Won't the mini-usb adaptor power and notebook usb power collide?  I need to know in preparation to power the Behringer.

--- End quote ---

That's what electronics engineers are paid for.

I believe you're over-thinking the sound card aspect. If you want to record human voice the microphone will be orders of magnitude more important than the sound card.

Plus: Many voice-optimized microphones come with USB output these days so you won't even need a sound card.

dobsonr741:
Try Rew to see the noise floor of your laptop ADC: https://www.roomeqwizard.com/

Fungus:

--- Quote from: dobsonr741 on July 12, 2023, 12:55:59 pm ---Try Rew to see the noise floor of your laptop ADC: https://www.roomeqwizard.com/

--- End quote ---

That page recommends this calibrated USB microphone:

https://www.minidsp.com/products/acoustic-measurement/umik-1

I don't know anything about it but it could be what the OP really needs instead of a sound card (or something similar to that)

kirk spec:
The E1DA Cosmos ADC has this spec:

Input Range
1.7Vrms 640Ω,
2.7Vrms 1kΩ,
3.5Vrms 1.3kΩ,
4.5Vrms 1.66kΩ,
6.7Vrms 2.46kΩ,
7.6Vrms 2.82kΩ,
8.5Vrms 3.12kΩ,
10Vrms 3.48kΩ,
43Vrms 13.6kΩ
Note: Unbalanced impedance about 30% less.

I know input and output impedance is important due to the idea of resistive divider where the larger value will receive more voltage. How do I measure the resistance above? Is it the ADC input impedance or is it the source impedance of the Line Out?

RPP:
I've been using a Focusrite Scarlett 2i2 with REW, AudioTester and ARTA software for a while now.  It works well for me . . .

Rich

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