After reading a lot of rss feeds after my holiday (about 200+) I came across an article about high frequency sounds and how people over 30 will not be able to hear it - so I wanted to see if I am over the hill. It is the sort of noise that some shop keepers have outside their stores to stop youths congregating. Anyway, I generated a 12000Hz tone and I could hear it! If you want to try it just download audacity (a cross-platform audio editor) and create your own noise. Once you have audacity goto: Generate > Tone, then waveform = Sine, Frequency=12000 or higher, amplitude=1, duration=however long you want it (in seconds). You could make it your mobile (cell) phone's ring tone or burn it to a CD, put it on repeat, then go out and really annoy the neighbours' kids - are you reading this Ian? You can also go here and give yourself a hearing test. If you don't want to (or can't) download audacity you could try to download the attached annoying_sound.mp3 which is stereo and has 12000Hz on the left channel and 12060 Hz on the right channel to really annoy you.
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