Someone recently asked me about the de-emphasis option in LAME
(and presumably other iso based encoders).
There are three options:
n = (none, default)
5 = 0/15 microseconds
c = citt j.17
But all the code does is set a flag and write it to the bitstream.
I'm guessing that if you have a PCM input file where one of the above
types of de-emphasis has been applied, you can set this flag in the encoder.
Then the mp3 decoder will "undo" the de-emphasis during playback.
Does any one use this, or know what it is supposed to do?
FhG and Xing dont seem to have this option. Any objections if
I remove it from LAME?
Mark
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