G.723.1

G.723.1
Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s
StatusIn force
Year started1996
Latest version(05/06)
May 2006
OrganizationITU-T
Base standardsG.721
Related standardsG.726
Domainaudio compression
LicenseFreely available
Websitehttps://www.itu.int/rec/T-REC-G.723.1

G.723.1 is an audio codec for voice that compresses voice audio in 30 ms frames. An algorithmic look-ahead of 7.5 ms duration means that total algorithmic delay is 37.5 ms. Its official name is Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s. It is sometimes associated with a Truespeech trademark in coprocessors produced by DSP Group.

This is a completely different codec from G.723.

There are two bit rates at which G.723.1 can operate:

  • 6.3 kbit/s (using 24-byte frames) using a MPC-MLQ algorithm (MOS 3.9)
  • 5.3 kbit/s (using 20-byte frames) using an ACELP algorithm (MOS 3.62)
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