DR800 DR800SG has abnormal noise when page turning

[Opensesame]

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.

thanks

[Dellaster]

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.

[HansTWN]

Originally Posted by Dellaster

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.

Better test it on your dog! If it jumps every time you turn a page you know the sound exists.

[Patricia]

Originally Posted by Dellaster

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.

I'm delighted: I won't see 50 again but I can hear the 22khz.

[Dellaster]

Originally Posted by Patricia

I'm delighted: I won't see 50 again but I can hear the 22khz.

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.

[penartur]

Originally Posted by Patricia

I'm delighted: I won't see 50 again but I can hear the 22khz.

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

[mgmueller]

Originally Posted by Opensesame

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.

thanks

Another user reports a "whistle" on his new iRex 1000S: https://www.mobileread.com/forums/sho...37&postcount=1
I've never heard anything on my iRex iLiad, iRex 1000S or iRex 800S.

[TGS]

Originally Posted by Opensesame

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.

thanks

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!

[mgmueller]

Originally Posted by TGS

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!

Just did your test.
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.

[badbob001]

Originally Posted by mgmueller

Just did your test.
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.

Quick, test for the sound in standby.

[Opensesame]

Originally Posted by badbob001

Quick, test for the sound in standby.

It only happens when page turning.

[mgmueller]

Originally Posted by Opensesame

It only happens when page turning.

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...

[Opensesame]

Originally Posted by mgmueller

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: One 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...

Good idea

[TGS]

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

[Shaggy]

Originally Posted by Dellaster

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.

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.