G.722.2 | GSM-AMR Wideband Codec

G.722.2 (AMR-WB) Wideband Audio Codec

Adaptive Digital’s G.722.2 Audio Codec is a real-time implementation of the ITU-T G.722.2 standard, also known as Adaptive Multi-Rate Wideband (AMR-WB). Designed for high-quality speech communications, the codec delivers superior voice clarity for VoIP, mobile networks, teleconferencing, unified communications, and broadcast applications.

AMR-WB encodes 16 kHz sampled audio and supports multiple bit rates ranging from 6.6 kbps to 23.85 kbps, enabling flexible bandwidth management while maintaining excellent speech quality. By extending the speech frequency range from 50 Hz to 7 kHz, the codec provides significantly more natural and intelligible voice reproduction than traditional narrowband codecs limited to 300 Hz to 3.4 kHz.

As the first wideband speech codec standardized for both wireless (3GPP) and wireline (ITU-T) communications, G.722.2 has become a leading choice for next-generation voice services that require high speech quality, interoperability, and efficient bandwidth utilization.

Key Benefits

• ITU-T G.722.2 (AMR-WB) compliant
• Wideband speech coding with 50 Hz to 7 kHz audio bandwidth
• Multiple bit rates from 6.6 kbps to 23.85 kbps
• Enhanced HD voice quality and speech intelligibility
• Optimized for VoIP, mobile, and IP communications
• Suitable for teleconferencing and broadcast applications
• Efficient bandwidth utilization
• Real-time implementation for DSP, ARM, and embedded platforms

G.722.2, also known as Adaptive Multi-Rate Wideband (AMR-WB), is an industry-leading wideband speech codec standardized by both the ITU-T and 3GPP. This dual standardization enables seamless deployment across fixed-line, VoIP, and wireless communication networks, making AMR-WB one of the most widely adopted codecs for modern voice services.

Built on advanced Code Excited Linear Prediction (CELP) technology, G.722.2 delivers significantly improved speech quality compared to traditional narrowband codecs. By operating at a higher sampling rate and supporting a speech bandwidth of 50 Hz to 7 kHz, AMR-WB provides clearer, more natural voice reproduction and enhanced speech intelligibility for both voice and multimedia communications.

The codec supports multiple bit rates ranging from 6.6 kbps to 23.85 kbps, allowing communication systems to optimize bandwidth usage while maintaining excellent audio performance. G.722.2 also incorporates advanced telephony features such as Voice Activity Detection (VAD), Discontinuous Transmission (DTX), and Comfort Noise Generation (CNG) to improve network efficiency and enhance the user experience.

Today, AMR-WB is widely used in HD Voice services, VoIP platforms, mobile networks, unified communications, audio conferencing, and next-generation telecommunications systems, where superior voice quality and interoperability are essential.