Apogee MA-1 Silver Edition (Mk.II.3) Белая книга - Страница 2
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Aptomizer: White paper
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• Have a lower recording level and use a digital normalizer or optimizer after conversion: The
disadvantage here is that the resolution of the recording is not enhanced. For instance if 20
of the available 24 bits have been used, digital normalizing will "stretch" 20 bits to 24 bit. The
result is that the resolution remains the same , but the distortion is even worse since it has
been enlarged by the same ratio. Compare this to zooming in on a digital photo. The zoomed
in area becomes larger, but the resolution does not change and therefore the picture distortion
becomes equally more visible.
• Soft Limit: Soft Limit is a good way of keeping peaks in control and bringing up the overall level
However for some material the effect of soft limit is not desired.
The Aptomizer solution:
The Aptomizer circuit makes sure every bit available is being utilized without having "overs" be-
cause it is a self-learning process. The stereo balance will not be affected since the relationship
between left and right will always be maintained.
The procedure starts by going into the Learn Mode The Aptomizer circuit will keep track of maxi-
mum levels as long as this learn mode is engaged. Once this status is left, the Aptomizer circuit
will calculate the corresponding analog gain adjustment so that the maximum level measured will
be at exactly 0 dBfs. The DA analog circuitry will be adjusted accordingly to assure a true unity
gain signal path. It is now up to the user to make artistic decisions about the recording level,
leave it as is and have the perfect recording. Alternately go to trim mode, bring down the Aptom-
izer level to allow some headroom or bring up the Aptomizer level and engage soft limit to avoid
"overs". The last Aptomizer setting will always be stored and retrieved by the Rosetta 200 and
only when Learn Mode is engaged will the settings be changed.
Conclusion:
The Aptimizer circuitry will simplify the process of finding the right level for recording. It will en-
hance the quality of every recording by using the maximum headroom, without the need for any
compression, limiting or "bit-zooming". Leaving distortion and noise to a minimum and maximizing
the dynamic range. Needless to say this will be a very useful tool for any recording professional
and enthusiast.
APOGEE ELECTRONICS CORPORATION
www.apogeedigital.com