G.723 [withdrawn] - Extensions of Recommendation G.721 adaptive differential pulse code modulation to 24 and 40 kbit/s for digital circuit multiplication equipment application.

It uses sub-band adaptive differential pulse code modulation (SB-ADPCM) within a bit rate of 64 kbit/s.

G.726 is a waveform speech coder which uses Adaptive Differential Pulse Code Modulation (ADPCM)

NICAM sampling more closely resembles Adaptive Differential Pulse Code Modulation, or A-law companding with an extended, rapidly-modifiable dynamic range.

Similar to other ADPCM (Adaptive Differential Pulse Code Modulation) formats, Dialogic ADPCM compresses audio data into a series of 4-bit samples.

An important variation known as Adaptive Differential Pulse Code Modulation (ADPCM) is today used as the basic compression standard for the extended architecture form of CD-ROM (CD-ROM 'XA').

G.723 is an ITU-T standard speech codec using extensions of G.721 providing voice quality covering 300 Hz to 3400 Hz using Adaptive Differential Pulse Code Modulation (ADPCM) to 24 and 40 kbit/s for digital circuit multiplication equipment (DCME) applications.