Quote:
Originally Posted by tebasuna51
For what 16 bit?
BitDepth have no sense with encoded audio in frequency domain.
In the document 'Digital Audio Compression Standard (AC-3, E-AC-3) Revision B' say:
"8.2.1.1 Input Word Length
The AC-3 encoder accepts audio in the form of PCM words. The internal dynamic range of AC-3 allows input wordlengths of up to 24 bits to be useful."
Then if a input of 24 bits is appropriate for ac3 encoder also the output can be 24 bits.
Edit: and Aften accept 24 bits input without problem.
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You are correct - but only when talking about (E-)AC3. Things are totally different with TrueHD. TrueHD is a lossless codec. That means, it takes 16bit, 20bit or 24bit input data and does *NOT* convert that into frequency domain (doing that wouldn't be lossless), but simply compresses the audio data similar to how ZIP works. So if you feed e.g. a 16bit track into the TrueHD encoder and if you then feed the encoded data into a TrueHD decoder, you should get a perfect 1:1 copy of the original data out of the decoder.