:: > Is it theoretically possible to amplify the sound in a mp3 file without
:: > reencoding it? What would be the quality loss of this operation?
::
:: Yes: modifying the global_gain field in each channel of each granule in a
:: Layer III frame has the effect of amplifying or diminishing the decoded signal
:: in increments of 1.5 dB.
::
:: There is apparently no quality loss associated with this change as long as the
:: signal is not amplified so much as to cause clipping.
::
Clipping is also no problem of quality loss. It's only a problem of a
decoder decoding a MP3 to a fix-point PCM file. These decoders have problems
with high level clipping and with low level quanization noise.
MP3 can handle a dynamic of up to 400 dB.
--
Mit freundlichen Grüßen
Frank Klemm
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