G.722.1

G.722.1 / AMR WB Audio Coder

Adaptive Digital’s G.722.1 codec delivers high-quality wideband audio for VoIP, video conferencing, teleconferencing, and multimedia applications, with support for Annex C enhanced audio bandwidth up to 14 kHz.

Coding Rate: 16, 24, 32, and 48 kbps
Sampling Rate: 16, and 32 kHz
Delay: 20 microseconds pulvinar dapibus leo.

Platforms

Availability

Platforms

Arm ® Devices – Armv7-A / Armv8-A / Armv9-A || Armv7-M / Armv8-M || Legacy Cortex-M3

Texas Instruments – TI TMS320C7000 C7x, TMS320C6000 C66x / C64x / C64x+, C674x, TMS320C5000 C55x / C54x

MIPS32® 24KE™

ADT G.722.1 is available on the above Platforms: Other configurations are available upon request.

Features

Functions are C-callable
Multi -Channel Implementation
Completely re-entrant (Channel can interrupt any Channel, any time)
Can be integrated with echo cancellers, VOX and tone detection/regeneration
The encoder and decoder meet all ITU G.722.1 compliance data files
Includes Frame Loss Concealment Algorithm

Overview

G.722.1 Audio Codec Overview

G.722.1 is an ITU-T standard wideband audio codec designed to deliver high-quality voice and audio communications at low bit rates. Commonly used in video conferencing, teleconferencing, VoIP, unified communications, and audio streaming applications, the codec provides excellent speech clarity while efficiently utilizing available network bandwidth.

The codec supports audio bandwidth from 50 Hz to 7 kHz, enabling significantly improved voice quality compared to traditional narrowband telephony. For applications requiring enhanced audio fidelity, Annex C extends the audio bandwidth to 14 kHz, delivering more natural and intelligible speech. G.722.1 operates at 24 kbps and 32 kbps, while Annex C supports operation at 48 kbps.

G.722.1 uses advanced Modulated Lapped Transform (MLT) compression technology to achieve efficient coding with low complexity and high audio quality. This makes it well-suited for bandwidth-constrained networks where clear voice communication is essential.

The standard includes several annexes that expand functionality and implementation options. Annex A defines frame packet formats and capability identifiers, Annex B specifies floating-point implementations, and Annex C extends wideband audio performance up to 14 kHz. Future enhancements under study may further increase audio bandwidth to support high-definition audio applications.

As a result, G.722.1 has become a popular choice for conferencing systems, IP communications, and multimedia applications that require a balance of audio quality, compression efficiency, and interoperability.

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.

ARM Devices

G.722.1 ARM Cortex-A

CPU Utilization & Memory Requirements
Memory usage is given in units of byte

Function	32 kHz (Annex C) MIPS 48kbps	32 kHz (Annex C) MIPS 32kbps	32 kHz (Annex C) MIPS 24kbps	16 kHz MIPS 32kbps	16 kHz MIPS 24kbps	16 kHz MIPS 16kbps	Program Memory	Data Memory	Scratch
Encode	19	18	15.5	10	9	9	—	—	—
Decode	19.5	18	16	9.5	8.5	8	—	—	—
Encode/Decode	38.5	36	31.5	19.5	17.5	17	46544	31450	6.4K

* With annex “C” defined.

G.722.1 ARM Cortex-A Memory

Memory Requirements
All Memory usage is given in units of byte.

Function	Program	Data	Channel		Scratch
Encode	—	—	1.3K*	668	5.2K
Decode	—	—	2.6K*	1.3K	5.2K
Encode/Decode	7148	24K	—	—	5.2K

G.722.1 ARM Cortex-A Channel Memory

Per Channel Memory Requirements
Memory usage is given in units of byte

G.722.1 Mode	Encoder	Decoder
Wideband (16kHz)	656	1344
Ultra-Wideband (32kHz)	1296	2624

G.722.1 ARM Cortex-M4

CPU Utilization & Memory Requirements
Memory usage is given in units of byte

Function	32 kHz (Annex C) MIPS 32kbps	32 kHz (Annex C) MIPS 24kbps	16 kHz MIPS 32kbps	16 kHz MIPS 24kbps	Program Memory	Data Memory	Scratch
Encode	31.2	28.6	18.6	17.7	—	—	—
Decode	28.8	26.1	15.8	14.6	—	—	—
Encode/Decode	60	54.7	34.4	32.3	14956	30192	6.4K

G.722.1 ARM Cortex-M33/M35 – estimate

CPU Utilization & Memory Requirements
Memory usage is given in units of byte

Function	32 kHz (Annex C) MIPS 32kbps	32 kHz (Annex C) MIPS 24kbps	16 kHz MIPS 32kbps	16 kHz MIPS 24kbps	Program Memory	Data Memory	Scratch
Encode	25	23	15	11.3	—	—	—
Decode	23	21	10	11.7	—	—	—
Encode/Decode	48	44	25	23	14956	30192	6.4K

G.722.1 ARM Cortex-M Channel Memory

Per Channel Memory Requirements
Memory usage is given in units of byte

G.722.1 Mode	Encoder	Decoder
Wideband (16kHz)	656	1344
Ultra-Wideband (32kHz)	1296	2624

G.722.1 ARM Cortex-M3 Legacy

CPU Utilization & Memory Requirements
Memory usage is given in units of byte

Function	MIPS 24kbps	MIPS 32kbps	Program Memory	Data Memory	Per-Channel Data Memory
Encode	28.2	28.9	—	—	648
Decode	27.1	28.1	—	—	1312
Encode/Decode	55.3	57	28318	20718	1950

TI Processors

G.722.1 C62x

CPU Utilization & Memory Requirements
Memory usage is given in units of byte

Function	MIPS 24kbps	MIPS 32kbps	Program Memory	Data Memory	Per-Channel Data Memory
Encode	2.47	2.6	—	—	648
Decode	2.22	2.45	—	—	1312
Encode/Decode	4.69	5.05	20128	22624	1950

G.722.1 C64x / C64x+ / C66x /C674x | C7x

CPU Utilization & Memory Requirements
Memory usage is given in units of byte

Function	32 kHz (Annex C) MIPS 48kbps	32 kHz (Annex C) MIPS 32kbps	32 kHz (Annex C) MIPS 24kbps	16 kHz MIPS 32kbps	16 kHz MIPS 24kbps	16 kHz MIPS 16kbps	Program Memory	Data Memory	Scratch
Encode	4.93	4.70	4.22	1.95	1.86	1.75	—	656 or 1296*	—
Decode	3.98	3.49	3.34	2.12	1.85	1.76	—	1344 or 2624*	—
Encode/Decode	8.86	8.19	7.56	4.07	3.72	3.51	52K	—	6.4K

* With annex “C” defined.
C64x supports Big Endian/Little Endian

G.722.1 C55x

CPU Utilization

Function	32 kHz (Annex C) MIPS 48kbps	32 kHz (Annex C) MIPS 32kbps	32 kHz (Annex C) MIPS 24kbps	16 kHz MIPS 32kbps	16 kHz MIPS 24kbps	16 kHz MIPS 16kbps
Encode	5.91	5.76	5.32	3.10	2.91	2.85
Decode	7.64	7.07	6.53	4.15	3.64	3.39
Encode/Decode	13.55	12.83	11.85	7.25	6.55	6.24

Note: Annex C mode – The G.722.1 coder works for both 16kHz and 32kHz sampling rates. If annex C is not defined, the G.722.1 coder works for 16kHz sampling rate.

Description

G.722.1 Wideband Audio Codec

Adaptive Digital’s G.722.1 codec is a high-quality, low-complexity implementation of the ITU-T G.722.1 standard, designed for VoIP, video conferencing, teleconferencing, multimedia, and hands-free communication systems. The codec delivers exceptional speech clarity with audio bandwidth from 50 Hz to 7 kHz, while Annex C extends performance up to 14 kHz for enhanced wideband audio quality.

Optimized for bandwidth-efficient communications, G.722.1 supports 16, 24, 32, and 48 kbps operation, making it ideal for applications that require high-quality audio transmission over constrained networks. The codec supports both 16 kHz and 32 kHz sampled audio signals, providing reliable performance for modern IP communications and conferencing platforms.

Adaptive Digital’s G.722.1 solution is optimized for DSP, ARM, and embedded systems, offering a standards-compliant codec that combines excellent audio quality, low processing requirements, and seamless interoperability.

Key Benefits

ITU-T G.722.1 compliant encoder and decoder
High-quality wideband audio coding
Audio bandwidth up to 7 kHz
Annex C support for up to 14 kHz audio bandwidth
Supports 16, 24, 32, and 48 kbps bit rates
Optimized for low-complexity embedded implementations
Supports 16 kHz and 32 kHz audio sampling
Ideal for conferencing and hands-free applications
Suitable for VoIP, multimedia, and IP communications systems

API Functions

API function call summary

ResetG722_1 (…) Initializes the G.722.1 audio coder Channel structures

EncodeG722_1 (…) Executes the G.722.1 encoder

DecodeG722_1 (…) Executes the G.722.1 decoder