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Dave,
I didn't realize you were recording digitally, using an optical cable.
What is your digital source? A tape deck with optical out?
I have experienced this noise exactly as you have, when trying to record
digitally from my laptop. It sounds fine when the MT831 is paused in
recording preview mode, but the actual recording on minidisc has noise
which sounds like its dropping LSBs, or the sample words are
missaligned. I was thinking that it is either the copyright flag bit in
the SPDIF stream or some kind of format incompatibility with my laptop's
output - but haven't had time to research. Recording in analog mode
sounds fine, which makes me think its not the ATRAC compression, but
something with the digital input --> ATRAC path.
I even tried reducing and increasing the input levels to test if it is
ADC quantization noise (but there should NOT be an ADC in the path, but
I test anyway). The noise has the same magnitude and characteristics.
My suspicion is the copy protection bit is active in the stream from my
laptop, the MT831 recognizes this and reduces the compression quality.
I will be very surprised (and very pissed off) if this was a bug in
Sharp's design or poor compression quality on their part. Can anyone
share their knowledge on what the copy protection bit will do in digital
recording?
Chris Eddington
Sharp MT831-A owner
Santa Clara, CA
Dave Hooper wrote:
> Hmmmm... Ok - so if I'm recording digitally, I still hear the same
> artifacts. So that rules out the ADCs unless the Sharp has some kooky
>
> DAC->ADC design on the digital input. Which I'm pretty sure it
> doesn't.
>
> As for the guy who says 'get some better headphones' : The music I'm
> recording *HAS* hisss in the track. Better headphones would just let
> me
> hear the hisss better. My headphones are plugged into my minidisc
> headphone-out socket. If I record (either digitally or via analogue
> line-in) into my sharp831 I get a chance to preview the music as it
> goes
> into the MD recorder ... and it sounds NOTICEABLY different on record
> preview to how it sounds when I playback what I've just recorded - on
> the
> same MD unit - using the same headphones.
>
> So the actual headphones used are irrelevant here.
>
> Ideas or knowledge, anyone? (Should I maybe consider taking it back to
> the
> shop I bought it at? I've listened to a MD recorded on some Aiwa
> cheapy
> portable MD unit and it still sounds better than my twice-the-price
> Sharp
> portable.)
>
> Hey, are maybe Sharp portables not very good? And does the Aiwa
> portable use
> (as I suspect it probably does) the same ATRAC chipset as
> developed+used by
> Sony for the Sony portables?
>
> dave
>
> > > I find that my Sharp-831 does not offer particularly good
> > > compression. I can
> > > clearly HEAR the artifacts, especially if the music contains a
> > > quiet passage
> > > that contains a proportionately large amount of background hiss,
> and on
> > > cymbals, hihats, etc.
> >
> > Just remember, it could also be due to the ADCs. Decks often have
> much
> > better ADCs than portables.
> >
>
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