Lect-23_07 - Lecture 23 DPCM DM Line Codes 1 Delta...

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1 Lecture - 23 1-03-2007
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2 Delta Modulation
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3 D – Σ Modulator
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4 Two versions of D – Σ Modulator
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5 Line Codes – PCM Signaling Formats Unipolar Signaling: A binary ‘1’ is represented by high level ( +5 Volts or A Volts) and a binary ‘0’ by zero level ( 0 Volts) This is also called ‘ON – OFF’ keying. Polar Signaling: Binary ‘1’s and ‘0’s are represented by equal positive and negative values. Bi-polar Signaling: This is also called pseudo-ternary signaling. A binary ‘1’ is alternately represented by positive or negative values ( say +5 volts or -5 volts) and a binary ‘0’ is represented by a zero level. Three encoded levels are used to represent two-level data. This is also called Alternate Mark Inversion (AMI).
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6 Line Codes – PCM Signaling Formats Manchester Signaling: Binary ‘1’ – a positive half a bit period followed by a negative half a bit period. Binary ‘0’ -
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Lect-23_07 - Lecture 23 DPCM DM Line Codes 1 Delta...

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