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#1
Posted to rec.audio.misc
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Audio frequency shifter wanted
I need something to allow me to hear the presence of high frequency
sounds. In particular, I need something to either shift sounds about 10KHz down or cut their frequency in half. For example, I want to be able to analyze engine sounds, CRT flyback sounds, turbulence in water and air flows, etc. I can't just use an oscilloscope or similar graphics device because the differences between a good and bad flow is usually too subtle to see on a video display. (I only need for the device to work at up to about 22KHz; I don't need it for communication with bats or dolphins, so I don't need for it to work in the 100KHz range.) Since I need for the response to be in real-time I can't just find an analog tape recorder and playback at half speed. (Also, since the response has to be in real-time there will be frequency palliating. This is acceptable.) My budget for the complete device, including microphone, is $300. I tried Google and found "eConvergence's Belfry Bat Frequency Division Detector" at http://njsas.org/projects/bat_detector/01/belfry.html This might do what I want, but it is do-it-yourself. I want an off the shelf device. I also found some MIDI things that might do what I want, but they need a MIDI studio to work with, which puts it out of my price range. Does anyone have any suggestions for a specific device or technical term? (Searching for either "frequency shift" or "frequency division" didn't help much, since there were too many hits for uses unrelated to my use [except for the Belfry Bat detector, which I found among 500 other hits.]) Thanks. due to |
#2
Posted to rec.audio.misc
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Audio frequency shifter wanted
Mark F wrote:
Does anyone have any suggestions for a specific device or technical term? (Searching for either "frequency shift" or "frequency division" didn't help much, since there were too many hits for uses unrelated to my use [except for the Belfry Bat detector, which I found among 500 other hits.]) How about a guitar/bass pitch-shifter pedal? http://behringer.com/UO300/index.cfm?lang=ENG http://www.bossus.com/index.asp?pg=1&tmp=22 Just for a couple... should be able to find them retail for well under $100. |
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