ARC Audio AMR-WB (G.722.2) Encoder and Decoder

DesignWare® ARC® Audio Adaptive Multi Rate Wide Band (AMR-WB) software for the DesignWare ARC Sound AS211SFX and AS221BD audio processors consists of a speech system for devices such as tablets, mobile phones and voice over IP (VoIP) applications.

AMR-WB is defined in ITU standard G.722.2 and referred to as wideband coding of speech using Adaptive Multi-Rate Wideband.

Compared to AMR-NB (300-3400Hz) AMR-WB has a much wider bandwidth (50-7000Hz) and provides a much better audio quality.

ARC Audio AMR-WB (G.722.2) Encoder/Decoder


  • Compliant to the G.722.2 ITU-T standard speech codec
  • Compliant to the following 3GPP (GSM) standards
    • 3GPP TS 26.173
    • 3GPP TS 26.174 (Test Vectors)
    • 3GPP TS 26.190 (Speech Codec)
    • 3GPP TS 26.194 (Voice Activation Detector)
  • Wide Audio Bandwidth: 50-7000Hz
  • Bitrates: 6.60, 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05 and 23.85 kbps (all nine speech codec modes)
  • Supports source controlled rate (SCR)
  • Sampling rate: 16 KHz with a resolution of 14 bits (in a 16 bit word)
  • Voice Activity Detection (VAD)
  • Comfort Noise Generation (CNG)
  • Packet Loss Concealment support for the decoder
  • Supports ITUT, MIME, DEFAULT, and IF2 bit stream formats
  • Discontinuous Transmission (DTX)
  • Robust against memory latency: 64/16 MHz processor load at 100 cycles latency (encoding/decoding)