Rick explained,
| You needn't bother outputting the signal and recording it. How about
| just comparing (on the computer) the level of a single channel of the
| CD vs. both channels added together. I'm just trying to eliminate the
| possiblity that that "mono" CD doesn't have identical left and right
| channels, and that when you add them you get some kind of
| interference/cancellation. Admittedly, it's a long shot.
Rick,
On several of the tracks in question, I had done an L-R in GoldWave and
gotten a completely flat result, indicating that the two channels were indeed
identical to start.
Also, combining the channels on the computer (say, by ripping a monaural CD
track to a stereo .wav and then converting it to a mono .wav; I guess I could
probably rip it directly to a mono .wav as well) doesn't necessarily follow
the same algorithms as combining them at the MD recorder. For example, the
track I mentioned before peaked at 100% on the CD; when I ripped it and re-
saved it as a mono .wav, the mono .wav still peaked at 100% exactly at the
point where the two channels had peaked. When I recorded it by optical cable
at unity gain to MD, the MD track was much softer; when I copied it to CDR
and re-ripped the CDR to the hard disk, the track peaked around 87%.
I think that the Sony decks' routines for shorting an S/PDIF signal to mono
do something to average or balance the volumes of the two channels, and when
the two channels are identical the calculations end up decreasing the peaks.
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