dCS 974 User Manual | Manual for Software Version 1.0x |
dCS Ltd | May 2001 |
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Step 5 – Reducing the Output Wordlength
If you are using Pure Format Conversion or DSD output modes, the Output Wordlength cannot be changed. Proceed to Other Settings.
If you are performing a sample rate conversion with PCM outputs, the destination equipment can handle 24 bit data and you do not want to reduce the wordlength then leave the Output Wordlength set to the default of 24 bits and set Dither to Off. Proceed to Other Settings.
The dCS 974 generates 24 bit data, regardless of the input word length. If the destination equipment 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 effects will result. For more information, see Word Length Reduction on page 104.
do this: Check the maximum input wordlength specification in the manual for the destination equipment. You must set the dCS 974 to match this.
TOP LEVEL |
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Sample Rate Conversion |
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Audio Input Select |
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Sync Source |
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| Default | |||
Input Sample Rate |
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| 24 | |||
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Output Sample Rate |
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| 23 |
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Output Mode |
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| ... |
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Filter |
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| 8 |
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Output Wordlength |
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| Default | ||
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Noise Shaping |
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| Off | |||
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Dither |
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| 1st Order |
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AES Message Edit |
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| 10th Order | Default |
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| Off | |
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| Top Hat |
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| Triangular |
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| NS Triangular |
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Figure 5 – Setting Wordlength, Noise Shaping and Dither
do this: Scroll down the Sample Rate Conversion menu to Output Wordlength and press the → button. Scroll down the list to the required number of output bits and press Set.
do this: Scroll down the Sample Rate Conversion menu to Noise Shaping and press the → button. From the list below, choose a suitable setting to match the Output Wordlength:
•for 22 or 23 bits, scroll to 2nd order and press Set.
•for 20 or 21 bits, scroll to 3rd order and press Set.
•for 16, 17, 18 or 19 bits, scroll to 9th order and press Set.
do this: For 16 or 17 bits, scroll down the Sample Rate Conversion menu to Dither and press the → button. Scroll down to NS Triangular and press Set.
Manual part no: DOC1241121A1 | Page 19 | Document No: |
Contact dCS on + 44 1799 531 999 | email to: more@dcsltd.co.uk |
(inside the UK replace + 44 with 0) | web site: www.dcsltd.co.uk |