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Topic: Showing sound waves (pressure v. time) on a PC (Read 10365 times)
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jmkess
Newbie
Posts: 1
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I'm looking for hardware and software that will let me use a microphone to display sound waves on a classroom PC. I have a few old ULI's which I use with old macs and the Vernier/Tufts MacSound software to accomplish this now, but now I have a video projector in my room hooked up to a PC and I want to use that to display the waveforms. Our PCs have no external serial ports (at least none I can find), but have quite a few USB ports. The PC also seems to have a microphone built in to the monitor, but no-one in our school appears to have used it or has any idea how to. I also have a LabQuest. Any suggestions?
Joe
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jflick
Newbie
Posts: 1
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Joe,
I want to do this as well. One source of the hardware/software you need is Pico Technologies in the UK. They make PC oscilloscopes, spectrum analyzers, data loggers, etc. They have a product called DrDaq which includes PC oscilloscope and spectrum analyzer software and a small piece of hardware containing sensors for light, sound, and temperature. It sells for about $150 and is made for teachers. Check it out at
http://www.picotech.com/educational.html
I bought one a few months ago. I've played around with sound inputs and waveforms using the built-in microphone but haven't spent much time with it yet. It plugs into the parallel port on your PC and is a little slow in reacting. I called them about that, and they said they have an adaptor unit to go into the USB port which makes it faster - an extra purchase.
There may be other sources for this type of equipment, but I don't know (Let me know if you find any).
I'm also looking for some simple equipment that I can use to set up some sound and music demonstrations. In particular, I need an audio function generator that will put out sine waves and square waves and has a vernier dial so that I can vary the frequency continuously -- and a way to convert these waveforms into sound, like through a guitar amp or whatever. Need some kind of adaptor interface between the function generator and the amp. I'd like to do all this outside of the PC because I need the PC for displaying waveforms, frequency spectra, etc. Do you have any ideas on inexpensive hardware and the hookup for this?
John
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Jake
Vernier Specialist
Full Member
Posts: 176
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The LabQuest microphone can display the waveforms as you described. If you have Logger Pro 3.6 or newer installed, you can use the LabQuest's internal microphone in the same way that you would use a regular microphone sensor. This works great for displaying waveforms.
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