line coding - staffnew.uny.ac.idstaffnew.uny.ac.id/upload/132048522/pendidikan/line+coding.pdf ·...
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Line Coding
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Figure 4.1 Line coding
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Figure 4.2 Signal level versus data level
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Figure 4.3 DC component
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Figure 4.5 Line coding schemes
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Unipolar encoding uses only one voltage level.
Note:Note:
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Figure 4.6 Unipolar encoding
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Polar encoding uses two voltage levels Polar encoding uses two voltage levels (positive and negative).(positive and negative).
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Figure 4.7 Types of polar encoding
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In NRZ-L the level of the signal is In NRZ-L the level of the signal is dependent upon the state of the bit.dependent upon the state of the bit.
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In NRZ-I the signal is inverted if a 1 is In NRZ-I the signal is inverted if a 1 is encountered.encountered.
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Figure 4.8 NRZ-L and NRZ-I encoding
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Figure 4.9 RZ encoding
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A good encoded digital signal must A good encoded digital signal must contain a provision for contain a provision for
synchronization.synchronization.
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Figure 4.10 Manchester encoding
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In Manchester encoding, the In Manchester encoding, the transition at the middle of the bit is transition at the middle of the bit is
used for both synchronization and bit used for both synchronization and bit representation.representation.
Note:Note:
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Figure 4.11 Differential Manchester encoding
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In differential Manchester encoding, In differential Manchester encoding, the transition at the middle of the bit is the transition at the middle of the bit is
used only for synchronization. used only for synchronization. The bit representation is defined by the The bit representation is defined by the
inversion or noninversion at the inversion or noninversion at the beginning of the bit.beginning of the bit.
Note:Note:
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Figure 4.12 Bipolar AMI encoding
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Figure 4.13 2B1Q
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Figure 4.14 MLT-3 signal
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