Dell 2135cn Service Manual page 803

Threshold value
Version 1 2008.02.01
Analog signal
Voltage
The signal is converted to 1 or 0 depending on
whether it is higher or lower than a threshold value.
In other words, the waveform is quantified.
Voltage
0 1 1 0 1 0 0 0
Digital signal
Voltage
1
0
0 1 1 0 1 0 0 0
Chapter 6 Principle of Operation (Fax)
Time
Higher = 1
Lower = 0
Time
Time
6 – 4
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