Lecture 3: Delta Modulation (DM) 1nd semester

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Presentation transcript:

Lecture 3: Delta Modulation (DM) 1nd semester 1438-1439 By: Adal ALashban

Outline - What is Delta modulation? - Why Delta modulation? - Concept of DM. - DM block diagram. - Demodulation. - PCM Vs. DM.

What is Delta Modulation? - A Delta Modulation (DM or Δ-Modulation): Is an analog-to-digital and digital-to-analog signal conversion technique used transfer data.

Why Delta Modulation? - DM is an analog-to-digital conversion. - DM is the simplest form of differential pulse-code modulation (PCM). - DM used by Satellite Business Systems or SBS. - To achieve high signal-to-noise ratio, delta modulation. - DM can change instantly but voice signals can’t not change instantly. - DM signal is smaller than the PCM system.

Concept of DM

DM Block Diagram If signal is large, the next bit in the digital data is 1, otherwise, it is 0.

Delta Modulator

Demodulation - Demodulation: is digital-to-analog signal conversion. - It’s the reverse system of modulation. - Demodulation was first used in radio receivers.

DM Block Diagram

Delta Demodulator

PCM Vs. DM

PCM Vs. DM

Any Questions ?