Now, don't get all hot about it.
I have a dbx recorder or two here, and one can actually record bandwidth
limited squarewaves at higher levels. The one artefact you tend to see of
cours, is down to the finite time the processor takes to do things. You tend
to get level overshoots and undershoots and an obvious worsening of the
noise performance on louder recordings
I never really understood why everyone went toDolby, it was terrible if the
heads and eq were not exact, and was inherently non linear in an obvious
way. I would imagine if DBX had been adopted more widely, people would have
been a lot happier to have cassettes for home recording.

Brian

--
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"Phil Allison" wrote in message
...

"Trevor Wilson"

**If you REALLY want to laugh, look at a 7kHz square wave from a CD
player (even 5kHz is barely passable from most CD players). A good R-R or
high end vinyl playback can do a MUCH better job.


** Square waves output from a CD player (with a suitable test disk) are
near perfect examples of audio band limited square waves. The amplitude
and frequency are steady as a rock, harmonic phase relationships are near
perfect, channel matching is perfect and only inaudible harmonics are
missing.

OTOH, the square wave performance of typical hi-fi R-R and cassette decks
is utterly woeful. Amplitude is modulated all over the place, there is wow
and flutter, channel matching is woeful, there is obvious tape noise,
harmonic phase relationships are all out of wack, there is obvious ringing
and still the inaudible harmonics are missing.

In the cases of both LP and cassette, it is only possible to record a
square wave with low amplitude ( ie -20 dB or so) with any hope of just
getting the available bandwidth.

With CD, it makes no difference - full level ( ie 0dB) square waves are
routine.

TW is bereft of even a single clue.



.... Phil