Fuji Xerox DocuPrint M355df Service Manual page 525

Chapter 10 Principle of Operation
10.1 Telephone System
Threshold value
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
Time
Time
Time
10-4
Higher = 1
Lower = 0
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