App-28
IM 701210-06E
SHARP Band-pass Filter Order Pass-band Width 15%
Center frequency 10% 11% 12% 13% 14% 15% 16% 17%
Order 155 110 89 73 62 52 49 41
Center frequency 18% 19% 20% 21% 22% 23% 24% 25%
Order 38 36 34 32 27 26 25 24
Center frequency 26% 27% 28% 29% 30%
Order 23 22 21 21 21
SHARP Band-pass Filter Order Pass-band Width 20%
Center frequency 12% 13% 14% 15% 16% 17% 18% 19%
Order 191 129 98 78 67 58 49 46
Center frequency 20% 21% 22% 23% 24% 25% 26% 27%
Order 40 38 36 31 29 28 27 26
Center frequency 28% 29% 30%
Order 25 24 20
Computation Delay
The group delay can be derived from the following equation. It is constant and depends
on the filter order.
Group delay = (Filter order – 1)/2
Unit: s/T
s
(where T
s
is the sampling frequency [s])
The computation delay can be derived from the following equation.
Computation delay = {4 + (filter order – 1)/2}×sampling period
However, if the sampling frequency exceeds 100 kHz, it is fixed to 100 kHz (10 µs).
It is also fixed to 100 kHz (10 µs) when in envelope mode.
Characteristics Examples
• SHARP Low-pass
-80
-60
-40
-20
0
0 f 0.1 f 0.2 f 0.3 f 0.4 f 0.5 f
5%
10%
20%
SHARP Low-pass Frequency Characteristics
dB
(f: sampling frequency [Hz])
Appendix 6 DSP Channel Computation (Optional)
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