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Sampling rates higher than 44.1Khz?
Grand Dizzy
post Feb 5 2006, 01:10
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I recently met a musician who claims he can quite easily hear the difference between 44.1KHz and 96KHz.

This shocked me a little because I'd always been told that the human ear cannot hear any higher quality than CD (44.1KHz) quality.

So... was this guy just lying (or fooled by his senses), or was I being lied to when I was told the human ear cannot hear any higher quality than CD?

This post has been edited by Grand Dizzy: Feb 5 2006, 01:11
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Pio2001
post Feb 10 2006, 00:48
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Oh no !



QUOTE (AndyH-ha @ Feb 5 2006, 04:34 AM)
At 96kHz sampling rate the filter effects at 20kHz are somewhat different than when sampling at 44.1kHz. This is a measurable result but whether or not many, or any, people can truly hear it does not seem to have been established by impartial studies.
*


You can try it yourself : http://www.hydrogenaudio.org/forums/index....showtopic=17118 . However, if the files sound different, it doesn't mean that the high resolution one is better. It can be worse because of the ultrasonic content introducing distortions in the audible range.

QUOTE (AndyH-ha @ Feb 6 2006, 04:17 AM)
MOST audio players (as part of the DAC) use anti-alaising filters. The image is reflected back down from the Nyquist limit. That means it gets mixed into the music.
*


No. This is the case in an ADC. In a DAC, it is the opposite, it's the content below the Nyquist frequency that is reflected above the Nyquist limit. They are the ultrasonic harmonics that create the rectangle steps if the output is unfiltered.
Anyway, since CD are recorded with anti-alias filters, there is nothing left above 22050 Hz that could be "reflected back" in a DAC.

QUOTE (Hollunder @ Feb 6 2006, 04:53 PM)
So if I'm right a Anti-alias Filter is a low-pass filter (lets signals below a certain frequency go through) that cuts off every frequenzy above half the sample frequency to avoid alias-signals.

The Problem is that those filters can't be "perfect" but if you apply them at a higher sampling-frequency the result will be closer to perfect
*


They can be perfect in practice, but we don't want them to be perfect. It would cause a lot of oscillations at 22050 Hz. It could cause distortions and even endager the tweeters.

QUOTE (hdante @ Feb 7 2006, 11:27 PM)
Mathematically, cos(32KHz)+cos(30KHz) = 2*cos(31KHz)*cos(1KHz). Add the time in equation and you have a 1 KHz harmonic with a variable intensity of 2*cos(31KHz*t).
*


Mathematically, a 32 kHz frequency is a trigonometric function of time, not of frequency !

We have

Cos(32000 x 2 x Pi x t) + Cos(30000 x 2 x Pi x t) = 2 x Cos(31000 x 2 x Pi x t) x Cos (1000 x 2 x Pi x t)
For any t real.

Thus the sum of a 30 kHz and a 32 kHz sine is a 31 kHz sine that has a variable amplitude. This amplitude is given by the absolute value of Cos(1000 x 2 x Pi x t), that reach zero 2000 times per second, and 1 2000 times per second too.

QUOTE (mandel @ Feb 8 2006, 12:51 AM)
I just created a 96khz wav file with a 30k and a 32k tone and could hear a beat frequency as you say. 
*


You cannot count 2000 beats in your head in one second ! What you hear is not a beat frequency, but a 2 kHz sinewave. It is one of the two intermodulation products of the 30 kHz and 32 kHz sinewaves, that are 2 kHz and 62 kHz (f2 - f1 and f2 + f1). This is called intermodulation distortion, or IMD. It occurs in amplifiers and speakers, as well as harmonic distortion, whose sum, Total Harmonic Distortion, is noted THD.

QUOTE (krabapple @ Feb 8 2006, 01:00 AM)
there's no silly idea that some audiophile won't embrace.  There are belt-driven CD players out there too. 
*


Don't forget the anti-gravitational foils, that cancel the space-time distortions caused by mechanic parts of the CD players, and prevent the sound to move from the speakers to your ears : http://www.belt.demon.co.uk/product/ref/ref.html , or the interconnect cables shielded against gamma rays : http://www.hifi-cables.com/prod.html !
But my favourite one is the golden screwdriver : http://www.wbtusa.com/wbt0481.html
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ChiGung
post Feb 10 2006, 01:53
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I think i can see that happening in the amp - that the wavering current demand for beating 'hybrid' tones is not perfectly satisfied - producing the new tones.

True to form sir, if there are any left believing "mika@music player"'s ~midlevel acoustic misunderstanding in this thread.. theyve only got themselves to blame. I can see you earn your money whistling.gif

QUOTE
But my favourite one is the golden screwdriver http://www.wbtusa.com/wbt0481.html

Id give it a try though, good for mashing into difficult slots maybe shifty.gif


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no conscience > no custom
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Posts in this topic
- Grand Dizzy   Sampling rates higher than 44.1Khz?   Feb 5 2006, 01:10
- - AndyH-ha   The most profound differences are not higher frequ...   Feb 5 2006, 03:34
- - gameplaya15143   call him/her on it... make em prove it to you it ...   Feb 5 2006, 03:38
- - Grand Dizzy   Andy, I didn't realise antialiasing filters we...   Feb 5 2006, 21:48
- - AndyH-ha   MOST audio players (as part of the DAC) use anti-a...   Feb 6 2006, 03:17
|- - Grand Dizzy   Duhh... sorry, that all went completely over my he...   Feb 6 2006, 13:49
|- - krabapple   QUOTE (Grand Dizzy @ Feb 6 2006, 07:49 AM)Duh...   Feb 7 2006, 17:48
|- - hdante   QUOTE (krabapple @ Feb 7 2006, 02:48 PM)QUOTE...   Feb 7 2006, 18:06
|- - SebastianG   QUOTE (hdante @ Feb 7 2006, 06:06 PM)[...] Fo...   Feb 7 2006, 19:29
|- - hdante   QUOTE (SebastianG @ Feb 7 2006, 04:29 PM)QUOT...   Feb 7 2006, 22:27
|- - mandel   QUOTE (hdante @ Feb 7 2006, 10:27 PM)QUOTE (S...   Feb 7 2006, 23:51
|- - RockFan   QUOTE (mandel @ Feb 7 2006, 02:51 PM)That...   Feb 8 2006, 00:07
||- - krabapple   QUOTE (RockFan @ Feb 7 2006, 06:07 PM)QUOTE (...   Feb 8 2006, 00:27
|- - hdante   QUOTE (mandel @ Feb 7 2006, 08:51 PM)That...   Feb 8 2006, 00:48
||- - mandel   QUOTE (hdante @ Feb 8 2006, 12:48 AM)QUOTE (m...   Feb 8 2006, 01:04
||- - WmAx   QUOTE (mandel @ Feb 7 2006, 08:04 PM)Here is ...   Feb 8 2006, 01:15
|||- - mandel   QUOTE (WmAx @ Feb 8 2006, 01:15 AM)QUOTE (man...   Feb 8 2006, 01:28
|||- - ChiGung   QUOTE (mandel @ Feb 7 2006, 08:04 PM)Here is ...   Feb 8 2006, 04:39
|||- - WmAx   QUOTE (mandel @ Feb 7 2006, 08:28 PM)- Here w...   Feb 9 2006, 06:22
|||- - bug80   QUOTE (WmAx @ Feb 9 2006, 07:22 AM)Did you no...   Feb 9 2006, 10:48
|||- - WmAx   QUOTE (bug80 @ Feb 9 2006, 05:48 AM)QUOTE (Wm...   Feb 9 2006, 15:32
||- - hdante   QUOTE (mandel @ Feb 7 2006, 10:04 PM)Same res...   Feb 8 2006, 15:41
||- - mandel   QUOTE (hdante @ Feb 8 2006, 03:41 PM)QUOTE (m...   Feb 8 2006, 18:12
|- - WmAx   QUOTE (mandel @ Feb 7 2006, 06:51 PM)Why do y...   Feb 8 2006, 00:57
- - enry2k   I know that oversampling in A/D and D/A converters...   Feb 6 2006, 14:06
- - Hollunder   QUOTE (Grand Dizzy @ Feb 6 2006, 01:49 PM)Duh...   Feb 6 2006, 15:53
|- - Grand Dizzy   Oh I think I get it. It's a lot like picture ...   Feb 6 2006, 23:40
- - Hollunder   right, it's principialy the same I found a ni...   Feb 7 2006, 12:58
- - RockFan   QUOTE (Grand Dizzy @ Feb 4 2006, 04:10 PM)I r...   Feb 7 2006, 20:38
|- - krabapple   QUOTE (RockFan @ Feb 7 2006, 02:38 PM)Now as ...   Feb 7 2006, 22:11
||- - RockFan   QUOTE (krabapple @ Feb 7 2006, 01:11 PM)Wrong...   Feb 7 2006, 23:21
||- - WmAx   QUOTE (RockFan @ Feb 7 2006, 06:21 PM)You sim...   Feb 7 2006, 23:45
||- - RockFan   QUOTE (RockFan @ Feb 7 2006, 02:21 PM)Of cour...   Feb 7 2006, 23:51
|- - hdante   QUOTE (RockFan @ Feb 7 2006, 05:38 PM)On play...   Feb 7 2006, 22:37
||- - RockFan   QUOTE (hdante @ Feb 7 2006, 01:37 PM)Again, I...   Feb 7 2006, 23:40
||- - krabapple   QUOTE (RockFan @ Feb 7 2006, 05:40 PM)QUOTE (...   Feb 8 2006, 00:00
|||- - RockFan   QUOTE (krabapple @ Feb 7 2006, 03:00 PM)I loo...   Feb 8 2006, 00:11
|||- - RockFan   You bore me. The last word is yours, please do sa...   Feb 8 2006, 00:19
||- - hdante   QUOTE (RockFan @ Feb 7 2006, 08:40 PM)But man...   Feb 8 2006, 00:22
|- - WmAx   QUOTE (RockFan @ Feb 7 2006, 03:38 PM)Please ...   Feb 7 2006, 23:39
|- - RockFan   QUOTE (WmAx @ Feb 7 2006, 02:39 PM)By reading...   Feb 7 2006, 23:44
- - sven_Bent   @gangran dizzy i hear alot of audiophiles around ...   Feb 7 2006, 23:04
- - AndyH-ha   QUOTE Why do you say the hi-res mix may be safely ...   Feb 8 2006, 00:27
|- - mandel   QUOTE (AndyH-ha @ Feb 8 2006, 12:27 AM)Q...   Feb 8 2006, 00:37
- - krabapple   http://www.ioforums.net/forums/view_topic....rum_i...   Feb 8 2006, 00:49
- - Grand Dizzy   This thread is fascinating! But most of it is ...   Feb 8 2006, 23:06
|- - ChiGung   QUOTE (Grand Dizzy @ Feb 8 2006, 10:06 PM)Thi...   Feb 9 2006, 02:53
|- - LoKi128   QUOTE (ChiGung @ Feb 8 2006, 08:53 PM)The que...   Feb 9 2006, 04:26
|- - ChiGung   QUOTE (LoKi128 @ Feb 9 2006, 03:26 AM)The sou...   Feb 9 2006, 13:53
- - LoKi128   Well, here is what little I can remember from RF t...   Feb 9 2006, 02:31
- - Hollunder   I guess the best way to proof that it has influenc...   Feb 9 2006, 04:26
- - krabapple   more on the 'beating' issue, from James Jo...   Feb 9 2006, 18:13
|- - hdante   There's too much interpreting here. I've f...   Feb 9 2006, 18:34
|- - ChiGung   QUOTE (hdante @ Feb 9 2006, 05:34 PM)QUOTE (m...   Feb 9 2006, 19:00
||- - SebastianG   QUOTE (ChiGung @ Feb 9 2006, 07:00 PM)Unfortu...   Feb 9 2006, 19:25
|||- - ChiGung   Points well made sebG - seems you are cool -Trie...   Feb 9 2006, 19:40
|||- - hdante   QUOTE (SebastianG @ Feb 9 2006, 04:25 PM)I co...   Feb 9 2006, 19:42
||- - hdante   QUOTE (ChiGung @ Feb 9 2006, 04:00 PM) That i...   Feb 9 2006, 19:39
||- - bug80   QUOTE (hdante @ Feb 9 2006, 08:39 PM)Ok, I th...   Feb 9 2006, 19:51
||- - hdante   QUOTE (bug80 @ Feb 9 2006, 04:51 PM)And how e...   Feb 9 2006, 19:58
||- - bug80   QUOTE (hdante @ Feb 9 2006, 08:58 PM)QUOTE (b...   Feb 9 2006, 20:06
||- - hdante   QUOTE (bug80 @ Feb 9 2006, 05:06 PM)I did and...   Feb 9 2006, 20:09
||- - bug80   QUOTE (hdante @ Feb 9 2006, 09:09 PM)QUOTE (b...   Feb 9 2006, 20:16
||- - hdante   QUOTE (bug80 @ Feb 9 2006, 05:16 PM)... yes? ...   Feb 9 2006, 20:23
|||- - bug80   QUOTE (hdante @ Feb 9 2006, 09:23 PM)QUOTE (b...   Feb 9 2006, 20:26
|||- - hdante   QUOTE (bug80 @ Feb 9 2006, 05:26 PM)By now, d...   Feb 9 2006, 21:19
|||- - bug80   QUOTE (hdante @ Feb 9 2006, 10:19 PM)QUOTE (b...   Feb 9 2006, 21:51
||- - ChiGung   QUOTE (bug80 @ Feb 9 2006, 07:16 PM)QUOTE (hd...   Feb 9 2006, 20:40
||- - bug80   QUOTE (ChiGung @ Feb 9 2006, 09:40 PM)QUOTE (...   Feb 9 2006, 20:45
||- - ChiGung   QUOTE (bug80 @ Feb 9 2006, 07:45 PM)QUOTE (Ch...   Feb 9 2006, 20:56
|- - mandel   QUOTE (hdante @ Feb 9 2006, 06:34 PM)There...   Feb 9 2006, 22:40
- - SebastianG   QUOTE (Grand Dizzy @ Feb 8 2006, 11:06 PM)Thi...   Feb 9 2006, 18:17
|- - hdante   QUOTE (SebastianG @ Feb 9 2006, 03:17 PM)So w...   Feb 9 2006, 18:46
|- - bug80   QUOTE (hdante @ Feb 9 2006, 07:46 PM)Remember...   Feb 9 2006, 18:54
- - krabapple   JJ again , at even greater length and detail, on h...   Feb 9 2006, 18:45
- - bug80   Here is a little Matlab code for anyone who likes ...   Feb 9 2006, 19:08
|- - ChiGung   QUOTE (bug80 @ Feb 9 2006, 06:08 PM)Here is a...   Feb 9 2006, 19:11
|- - bug80   QUOTE (ChiGung @ Feb 9 2006, 08:11 PM)QUOTE (...   Feb 9 2006, 19:15
|- - ChiGung   QUOTE (bug80 @ Feb 9 2006, 06:15 PM)QUOTE (Ch...   Feb 9 2006, 19:21
|- - bug80   QUOTE (ChiGung @ Feb 9 2006, 08:21 PM)QUOTE (...   Feb 9 2006, 19:25
|- - hdante   QUOTE (ChiGung @ Feb 9 2006, 04:21 PM)Ok, ill...   Feb 9 2006, 19:45
|- - ChiGung   QUOTE (hdante @ Feb 9 2006, 06:45 PM)QUOTE (C...   Feb 9 2006, 19:55
- - SebastianG   It's a matter of time/frequency resolution. If...   Feb 9 2006, 20:56
- - Pio2001   Oh no ! QUOTE (AndyH-ha @ Feb 5 2...   Feb 10 2006, 00:48
|- - ChiGung   I think i can see that happening in the amp - that...   Feb 10 2006, 01:53
- - Pio2001   QUOTE (mandel @ Feb 8 2006, 02:28 AM)Here whe...   Feb 10 2006, 00:49
|- - bug80   QUOTE (Pio2001 @ Feb 10 2006, 01:49 AM)QUOTE ...   Feb 10 2006, 11:17
|- - LoKi128   QUOTE (bug80 @ Feb 10 2006, 05:17 AM)Anyway, ...   Feb 11 2006, 04:04
- - Rotareneg   For an example of ultrasonic sound producing audib...   Feb 10 2006, 07:18


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