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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Manual part no: DOC1241121A1
Page 75
Document No: OS-MA-A0124-112.1A1
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
Noise
Noise arises from processing rounding errors, and from stop band performance.
It is typically around –130dB0, but depends on the conversion being used.
Group Delay
The conversion process takes time, and the time is dependent on the
conversion being carried out, and the filters used. Typical values in
microseconds are given for four conversions in the table below.
Group Delay (µ
µµ
µs) Sample Period (µ
µµ
µs)
Conversion Filter
1
Filter
2
Filter
3
Filter
4
Input Output
44.1k ⇒
⇒⇒
⇒ 96k
1141 1131 1131 1131 22.676 10.417
88.2k ⇒
⇒⇒
⇒ 44.1k
1024 11.338 22.676
96k ⇒
⇒⇒
⇒ 44.1k
1515 1065 1065 1065 10.417 22.676
96k ⇒
⇒⇒
⇒ 48k
868 958 1028 948 10.417 20.833
Table 7 – Group Delays, PCM to PCM transitions