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Re: Stereo > Mono Downmixing on iOS
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Re: Stereo > Mono Downmixing on iOS


  • Subject: Re: Stereo > Mono Downmixing on iOS
  • From: Paul Davis <email@hidden>
  • Date: Thu, 31 Mar 2011 19:30:09 -0400

On Thu, Mar 31, 2011 at 7:25 PM, Paul Davis <email@hidden> wrote:

 [ ... ]

this was sent before i was done editing :(

basically, the story is fairly straightforward:

1) adding samples together may overflow the sample format
2) it is almost certain never to happen if the sample format is floating point
3) in integer or fixed point formats, you need to "solve" the overflow
problem at the time of the summation
4) in the floating point case, you need to solve the overflow problem
whenever conversion back to an integer (or fixed point) format occurs
(it may never occur, in theory; in practice it always does).

there are an awful lot of systems out there that don't solve it in
either location, even though this is blatantly incorrect. it doesn't
bite all that often.

--p
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  • Follow-Ups:
    • Re: Stereo > Mono Downmixing on iOS
      • From: Roman Thilenius <email@hidden>
References: 
 >Stereo > Mono Downmixing on iOS (From: Jan <email@hidden>)
 >Re: Stereo > Mono Downmixing on iOS (From: Morgan Packard <email@hidden>)
 >Re: Stereo > Mono Downmixing on iOS (From: Jan <email@hidden>)
 >Re: Stereo > Mono Downmixing on iOS (From: Roman Thilenius <email@hidden>)
 >Re: Stereo > Mono Downmixing on iOS (From: Paul Davis <email@hidden>)
 >Re: Stereo > Mono Downmixing on iOS (From: Bob Lang <email@hidden>)
 >Re: Stereo > Mono Downmixing on iOS (From: Roman Thilenius <email@hidden>)
 >Re: Stereo > Mono Downmixing on iOS (From: Paul Davis <email@hidden>)

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