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IMA ADPCM encoding
Megaman
post Oct 21 2005, 04:52
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Hi, I recently acquired a cheap chinese MP3 Player with voice recording/encoding capability.

The max voice quality you can get from this is "IMA ADPCM 16bit 32kbps mono".

I downloaded some voice encodings from the player and opened them with Adobe Audition, edited useless parts and saved as the same format.

There is supposedly a re-encoding process going on, but I can´t notice any quality degradation. I really don´t want to save to plain PCM because, correct me if I´m wrong, the files would be 4 times bigger (I already tried with approximately 4x size increase).

What would you do to preserve as much quality as possible without increasing the size (I mean keeping it around the same bitrate)?

Thanks.

Edit: it was actually 32kbps

This post has been edited by Megaman: Oct 23 2005, 01:40


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kjoonlee
post Oct 21 2005, 05:29
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If all you're doing is splicing, you wouldn't lose any quality except at boundaries. I think you can safely ignore that.


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chrizoo
post Jun 11 2009, 11:07
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QUOTE (kjoonlee @ Oct 21 2005, 05:29) *
If all you're doing is splicing, you wouldn't lose any quality except at boundaries. I think you can safely ignore that.


why do you think so ?
After all, if you just split/truncate mp3 files, you definitely LOSE quality IF there is re-encoding taking place. (Only some special mp3-editors can split/truncate without re-encoding!)
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