NetNews Usenet Archive 1992 #31/NN_1992_31.iso/spool/rec/audio/17380

Text File | 1992-12-27 | 1.8 KB | 44 lines

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From: [e-mail] (Joe Peterson)
Subject: Sony MZ-1 (MD) recording noise
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Date: Sun, 27 Dec 1992 17:40:12 GMT
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I have been playing with a Sony MZ-1 (MD recorder) for a while now.
I like the unit very much, including the sound quality.  But I have
a question for anyone out there who has some experience or access to
one of these.

When doing analog recording (via analog line from a CD player), I
have noticed a slight modulated tone at a very low level (up and
down wavering tone).  You can hear it in the playback if you turn up
the volume all the way between songs from a CD (i.e. quiet) source.
It is mostly in the left ear, but a lower tone can be heard in the
right.  The wavering (modulation) of the tone's frequency seems to
be in sync with the dimming and brightening of the LCD display
while recording (you can hear it through the headphones while
recording as well).  I can hear it while recording with nothing
plugged into the input jack as well.

My theory is that there is some kind of cross-talk between the
power supply and the A/D converter (perhaps the left channel HW
is closer to the source).  As far as the bright-and-dim flucuations
of the LCD back-light: maybe this is due to the periodic activation
of the writing laser.

Any info from others out there would be appreciated.  I'd love
to know whether these bahaviors are normal for the unit or
not.

I am being a bit anal here (the interference I hear is not
really detectable when actual music is present!).

                        Joe