On Fri, Jul 8, 2011 at 7:49 AM, Bert Freudenberg <b...@freudenbergs.de> wrote: > On 08.07.2011, at 08:08, Caryl Bigenho wrote: > >> Hi.... >> >> Let's put this to a test! >> >> With all the flooding we are having in Montana this summer the clouds of >> mosquitos are really fierce! Our family is visiting with their PCs and I >> have a Mac. We can try this in the next couple of days and see if it really >> works. It says it can be barely audible. I was curious to see how low these >> notes would be and found this interesting chart (link below). Many of the >> instruments listed are no longer in daily use and exist mainly in museums, >> but some, such as the bass viol and bassoon are very common. In fact, my >> husband has his bassoon here with him in Montana! But, I don't think he >> wants to play a continuous low note... he has better things to do! We can >> find an appropriate tone generator for our test. >> >> http://www.contrabass.com/pages/frequency.html >> >> Caryl > > Easy to test using an XO. In Etoys, select the "sound" category in any > object's viewer, drag out the "play frequency of" tile, make the script > ticking. You should hear the sound now, and you can click on the green > down-arrow to lower the frequency: > > > > > On my XO it becomes inaudible at 200 Hz using the built-in speakers. Plugging > in good headphones it goes way below 30 Hz. > > - Bert - > > > > _______________________________________________ > Sugar-devel mailing list > Sugar-devel@lists.sugarlabs.org > http://lists.sugarlabs.org/listinfo/sugar-devel > >
Absolutely we should use things like this as an opportunity for kids to do some science. (FWIW, you can use Turtle Art to generate sine waves as well, by importing a python block) [[0, ["start", 2.0], 0, 100, [null, 1]], [1, ["userdefined", "pysamples/sinewave.py"], 0, 142, [0, 2, null]], [2, ["number", 100], 58, 142, [1, null]]] Where you set number to whatever Hz you want. -walter -- Walter Bender Sugar Labs http://www.sugarlabs.org _______________________________________________ Sugar-devel mailing list Sugar-devel@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/sugar-devel
