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)