03-15-2010, 11:57 PM | #1 |
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DR800SG has abnormal noise when page turning
Does anyone find there is abnormal noise like "zzzz" when turning the page on DR800SG? The sound is little and you have to put your ear close to the device.
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03-16-2010, 12:45 AM | #2 |
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I don't hear anything, but it's possible that it's out of my audible range. I can hear the 19khz tone, but not the 20khz tone, at the Mosquito Ringtone Hearing Test. If you can hear 20khz or higher you may be noticing something most people can't.
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03-16-2010, 12:49 AM | #3 | |
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03-16-2010, 01:52 AM | #4 | |
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03-16-2010, 02:54 AM | #5 |
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That's exceptional!
I won't see 50 again either and I thought I was doing really well with that 19khz. You must have great genes and/or you've kept your eardrums from getting beaten up by loud noise all your life. |
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03-16-2010, 03:19 AM | #6 |
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If your sound card accepts only 44k samples per second (44khz), as most soundcards do (and most "HD Audio" soundcards are configured in windows to use 44khz), then it cannot output any sine waves with frequency more than 22khz, see http://en.wikipedia.org/wiki/Nyquist...mpling_theorem
50khz sine wave will turn on into silence after resampling to 44khz, so there will be nothing but silence from your speakers, your ears cannot help it |
03-16-2010, 06:12 AM | #7 | |
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I've never heard anything on my iRex iLiad, iRex 1000S or iRex 800S. |
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03-16-2010, 06:37 AM | #8 |
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I can hear it if I put the back of the unit up against my ear, and, because I'm very old, I can't hear anything above 12 khz on the Mosquito test. I don't on the whole though read with the back of the unit against my ear so I can't see it being a problem - just wish you hadn't told me about it because now I'll be listening for it!
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03-16-2010, 07:49 AM | #9 | |
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When pressing my ear to the back, I hear it. It sounds somewhat like briefly flicking a spiral spring and listening to it vibrating. Never would have heard it in "normal reading position", looking at the front with a distance >> 20cm instead of pressing the ear to the back. |
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03-16-2010, 08:33 AM | #10 | |
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03-16-2010, 08:49 AM | #11 |
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03-16-2010, 09:39 AM | #12 |
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Just an idea: On most other readers, I have to inflict some "noisy" action, to turn pages: Push a button or use the stylus on the screen. This simply may "overlap" any sound of the display.
On iRex 800, turning the flipbar is relatively silent of course. So any "noise" may become way more obvious. Might just be the normal sound of flashing the screen. But I understand: Once you've found something, you focus on it and start to worry. And suddenly you hear it without even trying... Personally I don't really worry. Wouldn't have heard it on my own... Last edited by mgmueller; 03-16-2010 at 10:17 AM. |
03-16-2010, 10:07 AM | #13 | |
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03-16-2010, 12:04 PM | #14 |
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So. maybe we are agreed that it's not an abnormal noise, but a normal one that you can only hear if you do something abnormal with your ereader
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03-16-2010, 12:29 PM | #15 |
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I have yet to see 50, but I was a drummer for a long time. I'm avoiding that test because it'll probably just depress me.
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