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Music Clip where lowpass 16 is obvious?
guidryp
post Apr 2 2002, 15:11
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I recently did a sweep test and I can easily hear past 20k (I don't have to turn up the volume or anything). But I had a hard time telling ff123's mustange clips Original from 15kHz cutoff.

I then encoded a some music at --lowpass 16 and could distinguish no loss of frequency.

Does anyone have a clip where the difference is blindly obvious to them. Lowpassing at 16 saves a lot of bits and if I can't tell the difference, why waste them? Perhaps my material does not make it obvious enough.

Peter
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guidryp
post Apr 5 2002, 03:16
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QUOTE
Originally posted by JonPike


Check the "How high can you hear" thread on this board..

This came up,  and apparently you can get soundcard generated aliasing on very high freqencies,  that's probably what your hearing.    Possibly the sound program ff123 used might have generated some distortion as well..

I used Cool Edit 2000 to make a longer one for more accuracy,  and found similar noises,  but:  1. Bringing the sound level from 0db to -3db reduced them a lot,  2.  Changing from 44.1Khz sample rate to 48Khz made them completely inaudible.  This on a SB Audigy card.



Yes, that worked perfectly. Apparently my card handles 48KHz natively as well. The alaising is unreal on the ff123 44.1KHz sweep. Converting the sweep to 48 KHz also worked well. But I was able to get a real good idea of my hearing with a slow sweep and a big frequency plot.

I notice the first drop off right around 15KHz and it is silence by 16KHz.

Too bad about the aliasing since, most stuff seems to be in 44KHz.

Peter
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Posts in this topic
- guidryp   Music Clip where lowpass 16 is obvious?   Apr 2 2002, 15:11
- - JohnV   Try castanets. http://lame.sourceforge.net/downloa...   Apr 2 2002, 17:00
- - guidryp   QUOTE Originally posted by JohnV Try castanets. h...   Apr 2 2002, 17:05
- - guidryp   I tried the castanets on the ABX training site and...   Apr 3 2002, 01:08
- - NeoRenegade   QUOTE Originally posted by guidryp I recently did...   Apr 3 2002, 16:27
- - guidryp   QUOTE Originally posted by NeoRenegade I seriousl...   Apr 3 2002, 17:08
- - Pio2001   Since I'm at the bottom of the results of the "how...   Apr 3 2002, 22:33
- - guidryp   Thanks for the thread. I was able to find the neat...   Apr 3 2002, 23:28
- - guidryp   QUOTE Originally posted by NeoRenegade I seriousl...   Apr 4 2002, 01:35
- - tubenut   I have the same situation. My on-motherboard "sou...   Apr 4 2002, 06:05
- - guidryp   Now I burned a CD with with most of the sample dir...   Apr 4 2002, 06:25
- - lucpes   If you're looking for a new sound card I would sug...   Apr 4 2002, 06:52
- - Pio2001   Have a look at terratec products too, the EWX and ...   Apr 4 2002, 11:23
- - NeoRenegade   Sorry for doubting your hearing, guidryp.   Apr 4 2002, 15:05
- - guidryp   QUOTE Originally posted by NeoRenegade Sorry for ...   Apr 4 2002, 18:09
- - JonPike   QUOTE Originally posted by guidryp Thanks for the...   Apr 4 2002, 22:39
- - guidryp   QUOTE Originally posted by JonPike Check the "H...   Apr 5 2002, 03:16
- - fewtch   QUOTE Originally posted by tubenut Unfortunately,...   Apr 5 2002, 04:59
- - mithrandir   QUOTE Originally posted by fewtch Think twice ab...   Apr 5 2002, 07:26
- - SometimesWarrior   QUOTE Originally posted by fewtch Think twice ab...   Apr 5 2002, 07:36
- - lucpes   QUOTE does the Santa Cruz have the same high-frequ...   Apr 5 2002, 14:01
- - Case   Thanks for the links lucpes. Finally a test of SB ...   Apr 5 2002, 14:27
- - deranger   Use this cool program to test your soundcard: htt...   Apr 5 2002, 16:00
- - lucpes   for more reviews I would go here: http://www.digi...   Apr 5 2002, 16:06
- - Case   Thanks for the links Lucpes and Deranger. I downl...   Apr 5 2002, 18:04
- - rjamorim   QUOTE Originally posted by Case are kX drivers re...   Apr 5 2002, 18:49
- - tubenut   Do the reviews at www.pcavtech.com mean anything? ...   Apr 5 2002, 20:28
- - KikeG   You can get an updated version of the Sound Card A...   Apr 5 2002, 21:25
- - Case   QUOTE Originally posted by KikeG You can get an u...   Apr 5 2002, 21:46
- - fewtch   QUOTE Originally posted by SometimesWarrior I ju...   Apr 6 2002, 03:51
- - mp3fan   Tubenot, QUOTE Alas, my hearing petered out at so...   Apr 6 2002, 05:51


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