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Re: Automatically detect sound imperfections ?

Posted by Technobarbarian on 12/15/05 23:43

"ern" <erniedude@gmail.com> wrote in message
news:1134688442.631787.181020@g14g2000cwa.googlegroups.com...
>
> Technobarbarian wrote:
>> "ern" <erniedude@gmail.com> wrote in message
>> news:1134674979.161278.327540@o13g2000cwo.googlegroups.com...
>> > Anybody know a way or method or idea to...
>> >
>> > automatically detect sound imperfections and report them ?
>> >
>> > Could be using an existing program or one that I have to create...
>>
>> EncSpot will look for sync errors:
>> http://www.guerillasoft.co.uk/encspot/index.html I found it pretty
>> useless,
>> most of the errors it finds are imperceptable to the ear or so minor as
>> to
>> be easily ignored. It's "guesses" as to the encoder used are famously
>> inaccurate. The same algorithms used to clean up pops and clicks could
>> probably be used to find and count them, but once you've gotten to that
>> point I suspect most folks would rather clean them up than count them.
>>
>> TB
>
> Thanks TB. I don't want to clean up anything. I want to count,
> analyze, and know what those things are. I'll be purposely causing
> them, so the point of this application is to find pops, clicks.

It seems like pops and clicks are only part of the story and the
easiest thing to quantify. Hiss is important too and a lot harder to deal
with. Blank spots can be part of the music or a big imperfection. And the
EncSpot guy does seem to be onto something too, it just yields so many
positive hits that I didn't have time to go through and figure out which
ones mattered and which ones didn't. My sampling seemed to indicate that
most of them didn't matter.

I have gotten curious about what you're up to. If it was fast enough a
program to check the quality of mp3 files could be useful. Another program
you might want to look at is MP3 shield. It looks for corrupt files. In my
collection it runs around 50% false positives, but I haven't found any false
negatives and it gets it down to a list I can work through pretty quickly.

TB

 

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