I'm taking a risk posting this: Carfagno's out-of-control autoresponder might
forge my address on another vacation post to the list. Anything from
hosting4u.net is not from me, even if it bears my name.
Jonathan explained,
I> I didn't mean that exactly: recording a source with two identical channels
I> in stereo and then comparing them afterwards would help to determine where
I> and if a synchronisation loss was occuring - if after stereo recording
I> the two originally identical channels were out of sync. with each
I> other then the synchronisation loss is occuring somewhere between the
I> computer and the MD's DSP, meaning there is probably nothing 'wrong' with
I> the algorithm being used to combine the two channels for mono recording.
About three years ago I posted a similar puzzle here: mono-mode recordings
from other MDs -- for example, I'm getting ready to record a song off the
radio, and the recorder is in stereo mode in case the song will be in stereo,
but it turns out the song is monaural, so to save disc space I dub it in mono
afterward to another disc -- were also losing volume, and they were losing it
*throughout* the track. I posted that experience here and got no responses.
With that, as with this, the VU meters on the recorder showed the levels of
the input (as adjusted by the gain setting if it wasn't at 0.0 dB), but the
resulting recording was much softer throughout, not just at peaks.
If the explanation were that the tracks got out of sync, then the soft parts
of the redundant stereo input would become louder as they got mixed with
louder volumes. Moreover, how can the two channels of an S/PDIF signal get
out of sync like that? Every frame contains the left channel and the right
channel information that should be played at the same time.
I> Of course the ATRAC may work differently on each of the two channels for
I> stereo recording...
If ATRAC is destroying the peaks, why doesn't the same effect show up in
stereo-mode MD recordings? It has to be something in the algorithm for
shorting stereo to mono. When I have a .wav file on hard disc with two
identical channels and I convert it to mono, the amplitudes are preserved.
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