A high freq. pin in CD, audible High frequency |
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A high freq. pin in CD, audible High frequency |
 Oct 28 2006, 06:35
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#1
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Group: Members Posts: 97 Joined: 27-November 05 Member No.: 26025  |
I found that about 10%(some ADD & DDD but none of my 4D)of my classical music tracks have a audible high frequency pin around ~16KHz in the spectrum. Each Album have slightly different (constant) magnitude and frequency, and some of them even slightly change the freq. within the track, sometimes they reach the -60dB level.
All my tracks were ripped digitally by EAC to FLAC, so I believe this is not related to lossy compression/ AC noise from my computer, and surely it is not an instrumental tone.  I am really interested to find out the reason and where is the noise source, open wheel tape noise or something else? |
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Oct 28 2006, 06:52
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#2
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 WavPack Developer Group: Developer (Donating) Posts: 1219 Joined: 3-January 02 From: San Francisco CA Member No.: 900 |
I've seen this also from time to time. I believe that it's probably TV monitors in the recording studio which emit a whine at 15,750 Hz (NTSC) or 15,625 Hz (PAL), which is exactly what you seem to be getting. I believe there was a thread about this a few years back.
Yeah, here's the thread: http://www.hydrogenaudio.org/forums/index....showtopic=28244 edit: added link to old thread This post has been edited by bryant: Oct 28 2006, 06:55 |
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Oct 28 2006, 07:52
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#3
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Group: Members Posts: 830 Joined: 3-November 05 Member No.: 25526 |
I have some music with that same noise! It's incredibly annoying and audible.
I've heard it in some movies/anime too on the voice track. This post has been edited by Firon: Oct 28 2006, 07:52 |
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Oct 28 2006, 22:31
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#4
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Group: Members (Donating) Posts: 612 Joined: 31-May 06 Member No.: 31326 |
QUOTE (Firon @ Oct 28 2006, 02:52)  I have some music with that same noise! It's incredibly annoying and audible. I've heard it in some movies/anime too on the voice track. On the bright side of things, as you age, the sound will go away!  ...unless, like me, you get tinnitus and the blasted tv-sound whine is constant! -brendan -------------------- Hacking CD Robots & Autoloaders: http://hyperdiscs.pbwiki.com/
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Oct 29 2006, 03:10
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#5
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Group: Members Posts: 3080 Joined: 1-September 05 From: SE Pennsylvania Member No.: 24233 |
It should also be possible to apply a very narrow notch filter to remove this frequency, with very little effect on the music. Would have been nice if the recording engineer had done this for us.
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Oct 29 2006, 11:26
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#6
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 Group: Members (Donating) Posts: 480 Joined: 13-October 01 From: Stuttgart Member No.: 286 |
My old FM tuner had a very intelligent method to suppress the 19 kHz pilot tone: it mixed a counter-phase 19 kHz tone to the output signal. As the TV line frequency also is very constant, this method would be possible here too.
Is such a thing possible with some audio software? |
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Lo-Fi Version | Time is now: 18th May 2013 - 15:56 |
