From the original SynthMaker forum (2004–2014), with its members’ names and dates.
tester ·
I was wondering. Is it possible to create ultrasounds using sonic patterns from audible range? I mean - in a similar way as the binaural/differential beats are created, or to be more precise - some sort of amplitude modulation that is done by external/mechanical means (sound output is limited to SampleRate/2, thus nothing ultra- comes out of the box). Any ideas?
oddson ·
No... it is fundamental that your sound-card cannot produce any frequency above the Nyquist rate.
Warmonger ·
You can't do that with soundcard, but you should be able to produce ultrasonic sounds using nonlinear acoustic material, similiarly to nonlinear electromagnetic materials.
In fact, all normal materials are somewhat nonlinear, the issue is whether their nonlinearity is big enough to produce second-order and higher harmonics with resonable amplitude. This, however, can be answered only by knowing advanced physics of acoustics.
I don't think it's an interesting area or research, though, as ultrasonic sounds can be easily produced with basic analog devices.
tester ·
Well - if some sort of cheap "speaker" (method of combining) could be made externally, and ultrasonic material could be encoded within regular 44.1k sound (1st channel carrier, 2nd channel modulator), then maybe it's interesting however. Besides it's also a matter of whether this is happening naturally and under what conditions/circumstances (what kind of biological or mechanical factors are in the game).
jjs ·
Plus you need very expensive Ultrasound "speakers"like they used with Corrosion searches in metalls like they do in petroxhemic industries and they are very expensive. You're talking about 2 to 5 Mhz that kind of ranges. Simply not possible witg regular soundcard. Of course you can use flowstone or labview to control an interface capable of sending signals to such ultrasound device, but most of the times you wil be using Xylinx processors to program.
tester ·
Actually the story behind is a little different. 😉 First I started to look for some info on origins of yoga nidra (google is your friend) to make it a companion for qigong soaring crane. And found it in nyasa with conjunction with mantras and bija mantras (mantra purusha?). Then I started to check about the science behind mantras (effect vs meaning; towards effects of sound instead of philosophy of meaning), because adding sound to such body integrative techniques makes sense (digital formant filter is something they did not had in the ancient past). Thus I landed on peswiki and inventions of John Ernst Worrell Keely; like "ether", dissapearing water, but also cooling the air with sound (sonic refrigerator). Does not makes too much sense? 🙂 Maybe, but it was fun journey with interesting conclusions and some unanswered questions.
cyto ·
I like having you around, tester! 🙂
-cyto
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