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Reducing noise using a plurality of recording copies, This technique is already patented; does it work; is it used?
verdemar
post Mar 26 2013, 12:55
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I was pondering the usefulness of noise removal based on several copies of a recording, possibly from different physical copies. A Google search reveals that such a technique is already patented:

QUOTE
The present invention provides a method for reducing noise using a plurality of recording copies. The present invention produces a master file with lower noise than the available recording copies, and avoids the problems of losing musical content caused by prior art pop and click removers. The system comprises a recording playback unit, a computer system with a sound input capability, and a high capacity storage system such as a CD recorder. In operation, a plurality of recording copies of a single recording are played on the playback unit. These recordings are digitized by the computer and a separate recording file is formed for each copy of the recording. The recording files are then synchronized. The samples from each of the recording files are then averaged to reduce the noise components. A variety of threshold comparison techniques can be employed to eliminate samples and/or recording files that are outside of a computed range for that sample...


http://www.google.com/patents/US5740146

Do any of you know:

1) Does it work in practice?
2) Is software that does this available commercially or open source?
3) Are there available software/algorithms for synchronizing several audio streams (an essential step before comparing copies)?

Any pointers appreciated.
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verdemar
post Mar 26 2013, 20:56
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Group: Members
Posts: 42
Joined: 10-February 06
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Several replies while I was writing myself...

@bryant: Thanks for the pointer to previous discussion, I missed that when doing my initial search.

@Dynamic: The area of application I had in mind is for old shellac recordings where the masters are long gone, so more in the professional segment than for personal use.
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Posts in this topic
- verdemar   Reducing noise using a plurality of recording copies   Mar 26 2013, 12:55
- - DVDdoug   I theory this can work. Since the signal is coher...   Mar 26 2013, 19:24
|- - verdemar   Thanks, I also figured that the sychronization is ...   Mar 26 2013, 20:43
|- - Arnold B. Krueger   QUOTE (verdemar @ Mar 26 2013, 15:43) ...   Mar 27 2013, 03:03
|- - saratoga   QUOTE (Arnold B. Krueger @ Mar 26 2013, 21...   Mar 27 2013, 03:05
||- - Arnold B. Krueger   QUOTE (saratoga @ Mar 26 2013, 22:05) QUO...   Mar 27 2013, 12:53
||- - Woodinville   In order to make this work you must have: 1) exac...   Mar 28 2013, 00:21
||- - saratoga   QUOTE (Arnold B. Krueger @ Mar 27 2013, 06...   Mar 28 2013, 01:00
||- - Arnold B. Krueger   QUOTE (saratoga @ Mar 27 2013, 20:00) The...   Mar 29 2013, 14:05
||- - 2Bdecided   QUOTE (Arnold B. Krueger @ Mar 29 2013, 13...   Mar 29 2013, 15:21
|||- - verdemar   Sprechmann et al. use the multi-stencil fast march...   Mar 29 2013, 18:17
||- - Kees de Visser   QUOTE (Arnold B. Krueger @ Mar 29 2013, 14...   Mar 29 2013, 22:42
|- - soulsearchingsun   QUOTE (Arnold B. Krueger @ Mar 27 2013, 03...   Mar 27 2013, 08:36
- - extrabigmehdi   I know it's done for pics. If there are a cons...   Mar 26 2013, 19:33
- - Dynamic   QUOTE (verdemar @ Mar 26 2013, 11:55) Do ...   Mar 26 2013, 19:38
- - bryant   http://www.hydrogenaudio.org/forums/index....showt...   Mar 26 2013, 19:39
- - verdemar   Several replies while I was writing myself... @br...   Mar 26 2013, 20:56
|- - bryant   QUOTE (verdemar @ Mar 26 2013, 11:56) @br...   Mar 28 2013, 03:54
|- - verdemar   QUOTE (bryant @ Mar 28 2013, 03:54) Of co...   Mar 28 2013, 14:46
|- - 2Bdecided   QUOTE (verdemar @ Mar 28 2013, 13:46) I p...   Mar 28 2013, 17:39
|- - verdemar   QUOTE (2Bdecided @ Mar 28 2013, 17:39) It...   Mar 28 2013, 19:53
- - 2Bdecided   Wow! Thank you for sharing those David. The sy...   Mar 28 2013, 10:54
- - 2Bdecided   I don't think already declicked or denoised ve...   Mar 28 2013, 21:16
- - bryant   David and verdemar, thanks for taking the time to ...   Mar 29 2013, 07:56
- - 2Bdecided   Thank you for replying! Another potential use...   Mar 29 2013, 12:08


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