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How high can you hear (with music & lowpass), ABX required
How high can you hear?
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TJA
post Mar 6 2003, 03:51
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I tried the 19 kHz samples again and is was sooo easy to hear the difference that i got to 29/30 - the one mistake sure is an error because i was clicking quite fast between the buttons ...

About the (possible wink.gif ) 19.5 and 20.5 samples, i am not sure that i can test that on my current equipment.
As elaborated here http://www.hydrogenaudio.org/forums/index....=ST&f=21&t=7089 i need to go from my soundcard analog to a digital receiver to hear with headphones. And the quality i get from that is quite bad ... mad.gif

Only way to get around that is a new soundcard, with a digital optical out and an additional speaker out, so i can hook up both a receiver and that headphones directly without a receiver ...

About high frequencies, iīm 37, and also sometimes hear some electronic equipment or TV-sets, where most people i ask "do you hear that?" cannot hear it.
But i have no idea what frequences a TV or monitor (in standby) does produce ... unsure.gif


--------------------
3.90.3 --alt-preset extreme -V0 --lowpass 20.5 -> yeah!
"extremist of extreme", johnV @ Sep 13 2002 - 02:01 PM ;-)
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CiTay
post Mar 6 2003, 13:51
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QUOTE (TJA @ Mar 6 2003 - 03:51 AM)
But i have no idea what frequences a TV or monitor (in standby) does produce ...  unsure.gif

15.625 KHz for PAL, 15.75 KHz for NTSC.
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GeSomeone
post Mar 6 2003, 14:04
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QUOTE (CiTay @ Mar 6 2003 - 01:51 PM)
QUOTE (TJA @ Mar 6 2003 - 03:51 AM)
... what frequences a TV or monitor (in standby) does produce .

15.625 KHz for PAL, 15.75 KHz for NTSC.

I would think nothing in stand-by
--
Ge Someone


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In theory, there is no difference between theory and practice.
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DonP
post Mar 6 2003, 14:32
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QUOTE (TJA @ Mar 5 2003 - 09:51 PM)
About high frequencies, iīm 37, and also sometimes hear some electronic equipment or TV-sets, where most people i ask "do you hear that?" cannot hear it.
But i have no idea what frequences a TV or monitor (in standby) does produce ...   unsure.gif

I don't know about PAL, but NTSC (the US TV format) the scan frequency is around 15 kHz.
Computer monitors are all over depending on your video card settings, but if you hear a whine in standby
that is probably in the power supply rather than the flyback (scan) transformer.
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CiTay
post Mar 6 2003, 14:40
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QUOTE (GeSomeone @ Mar 6 2003 - 02:04 PM)
I would think nothing in stand-by

I reckoned he was talking about the monitor, not the TV.
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CiTay
post Mar 6 2003, 14:49
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By the way: 15.75 KHz tones are present on many (even professional) CD productions (in Europe 15.625 KHz tones), which can be seen in spectral analysis. This tones end up on the recording via direct acoustic transmission or when the magnetic field of a TV set near the studio room induces a voltage in the microphone cables.
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TJA
post Mar 6 2003, 17:22
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Hello together,

when thatīs not even 16 kHz, it is not a sign for being able hear good - just wondering that other people could not hear it. Maybe they just have REALY bad ears laugh.gif

KikeG?
Not to bug you, but is there a chance for the samples? unsure.gif
(ftp-server is up and running and also contains some music ...)

ftp://131.220.120.101/

then "incoming" to put things, "pub" to get things ...

Bye,


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3.90.3 --alt-preset extreme -V0 --lowpass 20.5 -> yeah!
"extremist of extreme", johnV @ Sep 13 2002 - 02:01 PM ;-)
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TJA
post Mar 11 2003, 14:23
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Hi!

Thanx to Kikeg for those 19.5 and 20.5 samples!
They are sitting in the above mentioned ftp-server ... (pub/wav/kikeg only, for now)

I tested again:

19.5: like a breeze 10/10
20: this time, nearly as easy!!!! (last time my ears were already deaf, i think)
20.5: much harder due to mistakes and then increasing hearing fatigue - i needed to stop before
beeing able to get below minimal procentage:

###
ABC/HR Version 0.9b, 30 August 2002
Testname: kikeg2

1R = M:\Audio\TEST\wav\kikeg\Chenoa_20_5KHz_lowpass.wav

---------------------------------------
General Comments:

---------------------------------------
ABX Results:
Original vs M:\Audio\TEST\wav\kikeg\Chenoa_20_5KHz_lowpass.wav
23 out of 32, pval = 0.010
###

BUT, i can here the differences quite well! At least till i hear them 10 times ... after that, it gets harder and harder to differentiate!

Also, for 20 kHz and 20.5 kHz it was much harder then 19.5 kHz and below!
I needed to hear "X", "X", then "A", then "X", then "B" then "X" for each trial ...
At 19.5 and below, i could just click "X", only sometime "A" and "X" to verify and then "next trial" smile.gif

Is there a program that supports some checksum?
I mean right now that is not a prove, as i could have made that up.
Maybe a program that calculates some checksum to verify the correct result?!?! smile.gif

I did not test 21 kHz again - but even with fresh ears, i donīt think i can get that ...

Btw. i am 37!!! B)


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3.90.3 --alt-preset extreme -V0 --lowpass 20.5 -> yeah!
"extremist of extreme", johnV @ Sep 13 2002 - 02:01 PM ;-)
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TJA
post Mar 13 2003, 09:56
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Update:

No way to hear the 21kHz lowpass
But 20.5 is confirmed! B)


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3.90.3 --alt-preset extreme -V0 --lowpass 20.5 -> yeah!
"extremist of extreme", johnV @ Sep 13 2002 - 02:01 PM ;-)
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KikeG
post Mar 13 2003, 11:22
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Still, take the results with a grain of salt, because if your card is not very good it can be influencing the test. For example, the other day, I got surprised when unadvertedly I could hear an obvious difference, on casual listening, with the 20.5 KHz lowpass samples.

What happened is that I was listening to the 44.1 KHz samples using Winamp directsound plugin in W98. With waveout plugin, which is safe, I could hear no difference, as usual. The directsound plugin, in my system (mostly for being Win98) ,distorts very high frequencies to the point that makes them easily audible, I guess some weird bad resampling happens.
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masterofimages
post Mar 17 2003, 23:51
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A very interesting test. First time I've ABXed anything. Up to 17.5 was easy (4/4), but then at 18 it got harder (8/10) and at 18.5 I couldn't tell (0/4). I must say that I'm surprised that I could tell the 18 cut-off so easily. In tone tests I could swear I can only hear up to 17.5! ohmy.gif
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