Setting The Uv22 - Yamaha CDR1000 Owner's Manual

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Chapter 5—Recording

Setting the UV22

When high-resolution digital audio is transferred to a lower-resolution system, care
must be taken to ensure that the digital audio samples are truncated correctly. When a
24-bit signal is transferred directly to a 16-bit CD recorder, for example, low-level detail
will be lost if the eight least-significant bits (LSB) of each audio sample are simply dis-
carded, resulting in distortion. The greater the truncation, the greater the distortion.
To optimize the truncation process when recording 20- or 24-bit digital audio via the
AES/EBU IN or COAXIAL IN, the CDR1000 employs the popular UV22 system.
Developed by Apogee Electronics Corporation in the United States, and commonly
used for wordlength truncation in CD mastering applications, UV22 preserves the
sonic detail present in 20- and 24-bit digital audio during the conversion to 16-bit
audio, without the side effects of earlier wordlength-reduction techniques, such as dig-
ital dither, noise shaping, and bit mapping.
Press the [UV22] button to turn on UV22 processing.
1
The UV22 indicator lights up.
Press the [UV22] button again to turn off UV22 processing.
2
The UV22 indicator goes out.
UV22 is only necessary when recording 20- or 24-bit digital audio sources via the
AES/EBU IN or COAXIAL IN. It does not affect analog sources connected via the ANA-
LOG IN. Discs recorded using UV22 can be played just like any other disc on standard
CD players.
CDR1000—Owner's Manual