PCM audio input clips about csharp-data-visualization HOT 8 CLOSED

Just ran your program and ran into a similar issue. If I yell at my microphone when I click run it works perfectly. Must have to do with some audio level input calibration in first run. Any ideas on if it is your code or if it is a libraries?

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Just ran your program and ran into a similar issue. If I yell at my microphone when I click run it works perfectly. Must have to do with some audio level input calibration in first run. Any ideas on if it is your code or if it is a libraries?

I haven't looked into it specifically yet (I know this issue is a bit old), but I just uploaded a similar program a few days ago: https://github.com/swharden/ScottPlot/tree/master/demos#realtime-audio-data

You can download compiled versions here:
https://github.com/swharden/ScottPlot/tree/master/demos/AudioMonitor/compiled

Do they present the same problems?

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I just ran the compiled version of the FFT AudioMonitor, and it presented the same issue. If I yell into the mic, it has far less 'mic noise' than the times that I open the program in silence.

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One thought I had is that I'm trying to force the sound card to operate in 16-bit mode, but perhaps not all sound cards are happy with this. I made an alternate version which auto-detects the bit rate the sound card wants to operate at. Does this version have the same problem? autoBitRateFFT.zip

I'm starting to wonder if it may be an issue with NAudio (the library I'm using to access the microphone). They have demo code on their website you could use to test it out if you want...
https://github.com/naudio/NAudio/blob/master/Docs/RecordWavFileWinFormsWaveIn.md

ps: Thanks for helping me debug this! I can't recreate the issue on my home computer (but I can at my work computer).

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I'm so sorry - I sent you the wrong ZIP. Does this version have the same problem?

autoBitrateCircular.zip

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I know what the problem is. I way over-thought it!

• left-click-drag to pan
• right-click-drag to zoom
• middle-click once to auto-scale

Just zoom out! It auto-zooms based upon the peak volume it hears in the first half-second or so.

Let me know how that works for you!

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Haha yeah, sorry...That definitely solves it! I should have noticed the units were off. Speaking of which, your y-axis is labeled Hz, but it is definitely not 1 Hz up there. Does it maybe mean kHz? or are the graph units arbitrary...

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Glad you got it working!

Yeah, that was a typo in the axis label. Those units are kHz. You can test it with http://www.szynalski.com/tone-generator/ to be sure.

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