Pulse modulation methods

Pulse accentuation schemes aim at appointment a narrowband analog arresting over an analog baseband approach as a two-level arresting by modulating a beating wave. Some beating accentuation schemes aswell acquiesce the narrowband analog arresting to be transferred as a agenda arresting (i.e. as a quantized discrete-time signal) with a anchored bit rate, which can be transferred over an basal agenda manual system, for archetype some band code. These are not accentuation schemes in the accepted faculty back they are not approach coding schemes, but should be advised as antecedent coding schemes, and in some cases analog-to-digital about-face techniques.

Analog-over-analog methods:

Pulse-amplitude accentuation (PAM)

Pulse-width accentuation (PWM)

Pulse-position accentuation (PPM)

Analog-over-digital methods:

Pulse-code accentuation (PCM)

Differential PCM (DPCM)

Adaptive DPCM (ADPCM)

Basin accentuation (DM or Δ-modulation)

Delta-sigma accentuation (∑Δ)

Continuously capricious abruptness basin accentuation (CVSDM), aswell alleged Adaptive-delta accentuation (ADM)

Pulse-density accentuation (PDM)