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Wave Corrector Users • View topic - filters produce or reveal new noise on tape

filters produce or reveal new noise on tape

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Moderator: Derek

filters produce or reveal new noise on tape

Postby citguy » Sat Feb 12, 2005 6:58 pm

I have been processing "concert hall" tapes which have various degrees of hiss or hum on them. When applying filters, both hum and hiss, I am either "creating" or revealing low level noises (in spaces with no music content) that sound like burbbling water or "chipmunk chatter". I suspect the cause of this is the inablility to get a really "clean" profile from a tape that has ever present "room ambiance". In other words, the concert hall has a "sound of its own" especially with 3000 people present. Hardly a studio setting. I have had to resort to just using treble cut on some of these tapes. Sometimes I can "get away" with using "hum and treble" but the combination of "hum and hiss filter" is definitely not possible. I have considered the possiblity of noise being "generated" by the tape at the playback heads. I have demagnetized and cleaned without significant improvement although I have discovered that magnetized heads can generate "new noise" at playback.
Stan
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Postby Derek » Sun Feb 13, 2005 2:02 pm

Stan

The characteristics you describe are typical of a file that has been over-filtered. This happens, as you intimate, when the noise profile includes other sounds along with the tape hiss. You really need to search for a section of the tape where there is no extraneous sound apart from the hiss – and then to capture this as a new noise profile. It should then be possible to hiss filter without the unwanted burbling.

You can rest assured that there is nothing wrong with your tape player. The hiss filter works by selectively removing frequency components of the signal. If too much is removed, it has the adverse effect on the sound quality that you have described.

In any event, from your description of this recording, I would advise only using the hiss filter on its minimum setting (8dB reduction).
Derek
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Postby citguy » Sun Feb 13, 2005 10:21 pm

Thanks Derek. I have found that the results vary with the "engineer" who made the recording and the "mike placement" either high in the hall or close to the orchestra. I have also found that taking an extremely small profile (.1 sec) and expanding it, then cleaning any "bumps" out of it with "cut and paste" can sometimes give me a cleaner profile. Does the "profile" average all the content or just create a mask based on everything it finds? I believe "hall ambience" is not a static signal but a background that has it's own frequency albeit a very low one.
(I posted this reply to the wrong messeage before but deleted it)
Stan
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Postby citguy » Fri Mar 18, 2005 11:59 pm

citguy
 
Posts: 151
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Postby Glenn » Sat Mar 19, 2005 6:27 pm

Glenn
 
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Location: Toronto, Canada

Hiss Filter

Postby ramiller » Fri Apr 01, 2005 4:36 am

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