User Guide

dCS Purcell User Manual Manual for Software Issue 2.2x
dCS Ltd September 2004
Manual filename: Purcell Manual v2.2x.doc Page 15 email: [e-mail]
English version web-site: www.dcsltd.co.uk
Step 4 – Reducing the Output Wordlength
If you are using Cloning or DSD output mode, or the output sample rate is set
to 176.4 or 192 kS/s, the Output Wordlength cannot be changed so proceed to
Other Settings.
IMPORTANT! Purcell generates 24 bit data, regardless of the input word length. If your
DAC cannot handle 24 bit data, the Output Wordlength MUST be set to
match. Noise Shaping and / or Dither MUST be applied to smooth the
transitions.
If the extra bits are just ignored, the audio outputs may sound grainy and
unpleasant low level effects will result. For more information, see “Wordlength
Reduction” on page 52.
do this: Check the maximum input wordlength specification in the manual for the DAC.
You must set Purcell to match this.
do this: Open the Menu and press the Output button once so the display shows
Out Word. Use the
Select button to set this page to match the number of bits
your DAC can handle.
do this: While the menu is still open, press the Output button again to scroll to the
N.Shape page (Noise Shape). Use the
Select button to set this to Auto.
do this: While the menu is still open, press the Output button again to scroll to the
Dither page. If the Out Word setting is 16 or 18 bits, use the
Select button to
set this to N.Tri. Otherwise, set it to Off.
Other Settings
The basic set-up procedure is complete.
Many more features are available through the Function Menu. See the Function
Menu section starting on page 20 for more information.