Adaptive-Multirate Wide-Band Speech Codec (ACELP)

The G722.2 recommendation describes the detailed mapping from input blocks of 320 speech samples in 16-bit uniform PCM format to encoded blocks of 132, 177, 253, 285, 317, 365, 397, 461, and 477 bits and vice versa. The sampling rate is 16 kHz leading to a bit rate for the encoded bit stream of 6.60, 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05, or 23.85 kbit/s. The coding scheme for the multi-rate coding modes is Algebraic Code Excited Linear Prediction Coder (ACELP). The multi-rate wideband ACELP coder is referred to as AMR-WB. The codec described in this recommendation also utilizes an integrated Voice Activity Detector (VAD).

Our implementation of G.722.2 is available for Blackfin platforms and can be demonstrated on BF533-EZLite or simulated on PC platforms.

Datasheet for Blackfin

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