Products > Test Equipment
Audio via Sound Card Line In and Spectrum Analyzer
radiolistener:
--- Quote from: dobsonr741 on July 12, 2023, 12:16:20 pm ---Any sound input/output on the PC will be real time - they are streams of data with a few millisecond latency.
--- End quote ---
it depends on the sound card. Professional sound card can support ASIO drivers with low latency down to 2-3 ms. Usual PCI-E sound card has about 100-300 ms latency. Some cheap Chinese sound card can have up to several seconds latency
radiolistener:
--- Quote from: Fungus on July 12, 2023, 12:48:49 pm ---Plus: Many voice-optimized microphones come with USB output these days so you won't even need a sound card.
--- End quote ---
usb output is a sign that microphone is not professional and has a bad sound quality
Fungus:
--- Quote from: radiolistener on July 12, 2023, 03:35:23 pm ---... several seconds latency
--- End quote ---
I really doubt that.
radiolistener:
--- Quote from: kirk spec on July 12, 2023, 01:50:35 pm ---How do I measure the resistance above?
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With amplitude measurement and using Ohms law. When you connect some sound source to sound input, both have some impedance and your connection turns into voltage divider. When impedance is the same it turns into 1:2 voltage divider, because both resistance is the same.
But high impedance is very bad, because higher resistance means worse noise floor due to Johnson–Nyquist thermal noise. This is why hi-end ADC and DAC max impedance is limited to about 2 kΩ max, because they will be unable to keep 140 dB dynamic range with higher impedance.
dobsonr741:
E1DA impedance: those voltage / impedance values are for the ADC input.
What is your source? Voltage level and impedance of the source?
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