Signal Handling
Digital data handling
158
Store signal value Saves the value of the signal at the time of the
command.
Sig zero - value Creates a new zero by subtracting the stored value from
the current value of the signal and applies this zero to all future values.
When these commands surround a baseline-shifting command, the effect is to
bring the new baseline to the previous level, as shown in Figure 24.
The Store event must occur before the event that shifts the baseline, and the
zero - value event must occur after the baseline has stabilized at the shifted
level.
Figure 24 Correcting baseline level shifts in digital signals
Baseline level change
Baseline-shifting event occurs
No correction
Signal
Signal
Run time correction
3. Sig zero – val event occurs
Time
2. Baseline-shifting event occurs
1. Store signal value event occurs
Time
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