G.723.1

Real-time implementation of the ITU G.723.1 voice coder

Adaptive Digital’s G.723.1 codec provides efficient low-bit-rate speech compression with Annex A support for VAD, DTX, and CNG, making it ideal for VoIP, IP telephony, and telecommunications applications.

Coding Rate: 5.3 or 6.3 kbps
Sampling Rate: 8 kHz
Delay: 37.5 msec

Platforms

Availability

Platforms
Arm ® Devices – Armv7-A / Armv8-A || Armv9-A || Armv7-M / Armv8-M
Texas Instruments – TI TMS320C7000 C7x, TMS320C6000 C64x/C64x+, C674x, TMS320C5000 C55x / Legacy C54x
Windows x86 (32-bit) / x64 (64-bit)
Linux 32-bit / 64-bit
ADT G723.1 is available on the above Platforms: Other configurations are available upon request.

Features

  • Fixed bit rate (5.3 kbit/s with 20 byte 30 ms frames, 6.3 kbit/s with 24 byte 30 ms frames)

  • eXpress DSP™ Compliant.

  • Functions are C-callable.

  • Capable of in-band synchronization.

  • Can be integrated with echo cancellers, and tone detection/regeneration.

  • C64x xDM Compliant: easy codec implementation and integration for DaVinci™ Technology

Description

G.723.1 Voice Codec

Adaptive Digital’s G.723.1 Voice Codec is a real-time implementation of the ITU-T G.723.1 speech coding standard, designed for applications that require high-quality voice compression and reliable speech reproduction. Widely used in VoIP, IP telephony, voice gateways, unified communications, and telecommunications systems, G.723.1 delivers efficient bandwidth utilization while maintaining excellent voice clarity.

The codec compresses speech using 30 ms frames with a low algorithmic delay of 37.5 ms, making it well suited for real-time voice communications. Adaptive Digital’s implementation includes Annex A support, featuring Voice Activity Detection (VAD), Discontinuous Transmission (DTX), and Comfort Noise Generation (CNG) to reduce network bandwidth consumption and improve overall communication efficiency.

Optimized for DSP, ARM, and embedded platforms, the G.723.1 codec provides a standards-compliant solution for developers and equipment manufacturers building next-generation voice communications products.

Key Benefits

  • ITU-T G.723.1 compliant encoder and decoder
  • High-quality speech compression for voice applications
  • Efficient low-bit-rate voice coding
  • 30 ms frame processing with low algorithmic delay
  • Annex A support for VAD, DTX, and CNG
  • Reduced bandwidth requirements for VoIP networks
  • Optimized for DSP, ARM, and embedded systems
  • Ideal for IP telephony, VoIP gateways, and telecom infrastructure

Specification Tables

NOTE: We specify MIPS (Millions of Instructions Per Second) as MCPS (Millions of Instruction Cycles Per Second). Unless otherwise specified, peak MIPS are indicated.

Armv7-A G.723.1 Cortex-A8/A9/A15 | Armv8-A, Armv9-A

CPU Utilization & Memory Requirements
Memory usage is given in units of byte
FunctionMIPS (6300 sampling rate)MIPS (5300 sampling rate)Program MemoryData MemoryPer-Channel Data MemoryScratch
Encode55.350.6166K18,98016008
Decode665048

G.723.1 Cortex-M4/M7 | ARM9e/ARM11

CPU Utilization & Memory Requirements
Memory usage is given in units of byte
FunctionMIPS (Peak)Program MemoryData MemoryPer-Channel Data MemoryScratch
Encode224193K18,98016008
Decode135048

G.723.1 Armv8-M Cortex-M33/M35 – Preliminary

CPU Utilization & Memory Requirements
Memory usage is given in units of byte
FunctionMIPS (Peak)Program MemoryData MemoryPer-Channel Data MemoryScratch
Encode314193K18,98016008
Decode18.25048

G.723.1 C64x+

Memory usage is given in units of byte
FunctionProgram MemoryData MemoryPer-Channel Data MemoryStack
EncodeCommon
10208		35232238801420444
Decode915221432400260

G.723.1 C64x

Memory usage is given in units of byte
FunctionProgram MemoryData MemoryPer-Channel Data MemoryStack
EncodeCommon
10112		40128238121420444
Decode892021364400260

MIPSMIPSMIPS
RateC62xC64x*C64x+
5.3 Encode6.17.87.2
5.3 Decode0.570.70.62
6.3 Encode5.77.37
6.3 Decode0.570.70.62

Note: Please contact us for C62x specifications.

*G.723.1 Annex A , which specifies silence suppression, voice activity detection (VAD), discontinuous transmission (DTX), and comfort noise generation (CNG), is included.

Rate | FunctionMIPSProgram MemoryData MemoryStackPer Channel Data Memory
5.3 Encode11.22150221716801480
5.3 Decode1.3424
6.3 Encode11.22150221716801480
6.3 Decode1.4424

*G.723.1 Annex A , which specifies silence suppression, voice activity detection (VAD), discontinuous transmission (DTX), and comfort noise generation (CNG), is included.

Rate | FunctionMIPS**Program MemoryData MemoryStackPer Channel Data Memory
5.3 Encode11.22162020744801480
5.3 Decode1.3424
6.3 Encode11.22162020744801480
6.3 Decode1.4424

**Note: The MIPS is measured when the program placed internally, and channel and tables are placed in the DARAM. For the low memory version build, the total MIPS usage increases by 0.5 MIPS

G.723.1 C54x

CPU Utilization & Memory Requirements
Memory usage is given in units of 16 bit word.
Coding RateMIPSProgram MemoryTable MemoryData MemoryPer-Channel Data Memory
5.316.513.03 K44652K1.3K
6.316.913.03 K44652K1.3K

G.723.1 C54x Annex A*

CPU Utilization & Memory Requirements
Memory usage is given in units of 16 bit word.
Coding RateMIPSProgram MemoryTable MemoryData MemoryPer-Channel Data Memory
5.322.614 K10 K1 K1 K
6.320.5614 K10 K1 K1 K

*G.723.1 Annex A , which specifies silence suppression, voice activity detection (VAD), discontinuous transmission (DTX), and comfort noise generation (CNG), is included.

G.723.1 Linux PC-Windows

CPU Utilization & Memory Requirements
Memory usage is given in units of byte
FunctionMIPS (Peak)Program MemoryData MemoryPer-Channel Data MemoryStackScratch
Encode9570K19K2100<20 KB16
Decode8

G.723.1 Linux 32 Bit*

CPU Utilization & Memory Requirements
Memory usage is given in units of byte
*Contact sales for 64 Bit numbers
FunctionMIPS (Peak)Program MemoryData MemoryPer-Channel Data MemoryScratch
Encode145160K19,17616008
Decode85048

API Functions

API function call summary

api functions

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