SIGNAL ENCODING TECHNIQUE
• Data can be analog or digital, so can be the signal that
represents it.
• Signal encoding is the conversion from analog/digital data
analog/digital signal.
• The possible encodings are:
• Digital data, digital signal
• Analog data, digital signal
• Digital data, analog signal
• Analog data, analog signal
,Digital Data, Digital Signal
LINE CODING
• Line-coding is the process of converting digital-data to digital-signa
• The data may be in the form of text, numbers, graphical images,
audio, or video
• The data are stored in computer memory as sequences of bits (0s o
1s).
• Line-coding converts a sequence of bits to a digital-signal.
• At the sender, digital-data is encoded into a digital-signal.
• At the receiver, digital-signal is decoded into a digital-data.
, • LINE CODING SCHEMES
• The Line Coding schemes are classified into 3 broad categories
• Unipolar - All signal levels are either above or below the time axis (e.g NRZ)
• Polar - The voltages are on the both sides of the time axis. Polar scheme can be
implemented with two voltages (-v for bit 1 and/or +v for 0). Examples: NRZ, Man
• Bipolar - This coding scheme uses 3 voltage levels: positive, negative & zero. Exam
Bipolar – AMI, Pseudoternary
• Data can be analog or digital, so can be the signal that
represents it.
• Signal encoding is the conversion from analog/digital data
analog/digital signal.
• The possible encodings are:
• Digital data, digital signal
• Analog data, digital signal
• Digital data, analog signal
• Analog data, analog signal
,Digital Data, Digital Signal
LINE CODING
• Line-coding is the process of converting digital-data to digital-signa
• The data may be in the form of text, numbers, graphical images,
audio, or video
• The data are stored in computer memory as sequences of bits (0s o
1s).
• Line-coding converts a sequence of bits to a digital-signal.
• At the sender, digital-data is encoded into a digital-signal.
• At the receiver, digital-signal is decoded into a digital-data.
, • LINE CODING SCHEMES
• The Line Coding schemes are classified into 3 broad categories
• Unipolar - All signal levels are either above or below the time axis (e.g NRZ)
• Polar - The voltages are on the both sides of the time axis. Polar scheme can be
implemented with two voltages (-v for bit 1 and/or +v for 0). Examples: NRZ, Man
• Bipolar - This coding scheme uses 3 voltage levels: positive, negative & zero. Exam
Bipolar – AMI, Pseudoternary
