App-43
IM 701210-06E
Appendix
App
MEAN (Moving Average) Filter
Characteristics
• Pass band is flat.
• Has linear phase characteristics and constant group delay.
• The characteristics are of low-pass filters.
• Has comb-shaped bandwidth characteristics.
-80
-60
-40
-20
0
0 f 0.1 f 0.2 f 0.3 f 0.4 f 0.5 f
2
4
8
16
32
64
128
MEAN (Moving Average) Frequency Characteristics
dB
(f: sampling frequency [Hz])
Computation Delay
The group delay can be derived from the following equation. It is constant and depends
on the filter order.
Group delay = (Number of moving average points – 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 + (Number of moving average points – 1)/2}×sampling clock
cycle
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.
Appendix 6 DSP Channel Computation (Optional)
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