eggman Posted July 24, 2007 Share Posted July 24, 2007 I've noticed that on occasion when using the test oscillator that i can hear sine waves at 20'000Hz as distinctly as those at 13'000. This should not be the case, as usually my ears kick out round about 17'000. Restarting Logic, relaunching core audio and switching my interface on and off (though not always in the order) generally resolves the problem, but i shouldn't have to go through all that. Does this happen to anyone of you out there. Would you think that Logic, OS X, my interface (Edirol FA-66), or my Monitors (KRK Rokit &SE) are to blame? Much appreciated. Link to comment Share on other sites More sharing options...
Ashermusic Posted July 24, 2007 Share Posted July 24, 2007 I've noticed that on occasion when using the test oscillator that i can hear sine waves at 20'000Hz as distinctly as those at 13'000. This should not be the case, as usually my ears kick out round about 17'000. Restarting Logic, relaunching core audio and switching my interface on and off (though not always in the order) generally resolves the problem, but i shouldn't have to go through all that. Does this happen to anyone of you out there. Would you think that Logic, OS X, my interface (Edirol FA-66), or my Monitors (KRK Rokit &SE) are to blame? Much appreciated. My guess is that it has more to do with temperature or other changes in your room or your ears than any of those but that is only a guess. Link to comment Share on other sites More sharing options...
eggman Posted July 24, 2007 Author Share Posted July 24, 2007 Thanks for your reply, but I wouldn't imagine so... (a) because mine are not the only ears to hear this, and (b) because the change occurs within seconds, and I know of no force in Geneva, save maybe CERN, that has the power to so quickly alter a room temperature to such drastic effect... Link to comment Share on other sites More sharing options...
shivermetimbers Posted July 24, 2007 Share Posted July 24, 2007 I've noticed that on occasion when using the test oscillator that i can hear sine waves at 20'000Hz as distinctly as those at 13'000. This should not be the case, as usually my ears kick out round about 17'000. Restarting Logic, relaunching core audio and switching my interface on and off (though not always in the order) generally resolves the problem, but i shouldn't have to go through all that. Does this happen to anyone of you out there. Would you think that Logic, OS X, my interface (Edirol FA-66), or my Monitors (KRK Rokit &SE) are to blame? Much appreciated. I just tried the osc. and found some problems with it. One being a frequency change when adjusting the volume level. You could use headphones to eliminate the speakers. Since volume can also determine what level you hear at, try using your built in audio (with headphones) and try the test osc again. Try this out. There is a free test to check your left and right ear at different dB's (It won't test the voices you hear in your head). I think musically my ears are shot and my right ear is damaged more than my left. http://www.digital-recordings.com/hearing-test/www-ht-pro/ht_help_p.html Link to comment Share on other sites More sharing options...
Jope Posted July 24, 2007 Share Posted July 24, 2007 If you hear something that you know you should not be able to hear, I suppose you conceive suspicion it might be something else what in fact is audible, right? Maybe it's a kind of interference between the 20kHz tone and the chosen sample frequency. Are you on 44.1kHz? 20kHz would be very close to the maximum that can theoretically be reproduced with that sample rate, and the closer you get to that maximum, the more artifacts arise (dependent on how good anti-aliasing works). Maybe do some experiments with higher sample rates. However, I have no idea why this happens only occasionally... Link to comment Share on other sites More sharing options...
ski Posted July 24, 2007 Share Posted July 24, 2007 Try this out. There is a free test to check your left and right ear at different dB's (It won't test the voices you hear in your head). Link to comment Share on other sites More sharing options...
fader8 Posted July 24, 2007 Share Posted July 24, 2007 Since volume can also determine what level you hear at, shiver, That's either incredibly profound and over my head, or you just hadn't had enough coffee yet. Link to comment Share on other sites More sharing options...
eggman Posted July 24, 2007 Author Share Posted July 24, 2007 http://www.digital-recordings.com/hearing-test/www-ht-pro/ht_help_p.html this test requires either I.E. or Netscape, and i'd go deaf rather than install either on my Mac Nice heads up Jope on the sample rate though... turns out i'd been running logic at 44, while my FA-66 had been running at 48 (and when turning it on and off, i had been hitting that switch by mistake... after a few tests, i established the following: running logic at 44 with the FA-66 at 48 = Buzz running logic at 48 with the FA-66 at 44 = Buzz running logic at 48 with the FA-66 at 48 = No buzz running logic at 44 with the FA-66 at 44 = No buzz Whether or not this is normal converter behaviour, I have no idea, but at least I now know what is going on and how to avoid it... Thanks you all for your help! Link to comment Share on other sites More sharing options...
shivermetimbers Posted July 24, 2007 Share Posted July 24, 2007 Since volume can also determine what level you hear at, shiver, That's either incredibly profound and over my head, or you just hadn't had enough coffee yet. It's the coffee depravation. After re-reading that it is the most redundant thing I have ever said. The only thing to top that was my wife asking me if I watered the fish. (Coffee Deprivation) In a long roundabout way (concerning loudness and frequency) a person with hearing loss will need to increase the dB of a frequency in order to hear it (along the lines of an EQ). This does not mean that nerve damage can be compensated for by turning up the volume (hearing aid). Link to comment Share on other sites More sharing options...
Nublu Posted July 24, 2007 Share Posted July 24, 2007 shivermetimbers wrote I think musically my ears are shot and my right ear is damaged more than my left. I know a guy who was tested and was experiencing 10% hearing loss. He made a conscious effort to avoid all stress on his hearing. He even carried ear plugs with him. Five years later, he was tested again. Somewhere in that period his hearing normalized. He figures about 98% ... Maybe you. As far as this thread goes, Jope is making a lot of sense to me. Link to comment Share on other sites More sharing options...
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