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G.722

G.722 is an ITU-T standard 7 kHz Wideband audio codec operating at 48, 56 and 64 kbit/s. It was approved by ITU-T in November 1988. Technology of the codec is based on sub-band ADPCM (SB-ADPCM).

G722 provides improved speech quality due to a wider speech bandwidth of 50–7000 Hz compared to narrowband speech coders like G.711 which in general are optimized for POTS wireline quality of 300–3400 Hz. G.722 sample audio data at a rate of 16 kHz (using 14 bits), double that of traditional telephony interfaces, which results in superior audio quality and clarity.

SPIRIT G.722 conforms to ITU-T G.722 recommendation that specifies speech compression and decompression at rates of 48, 56, or 64 Kbps based on Sub-Band Adaptive Differential Pulse Code Modulation (SBADPCM). G.722 SB-ADPCM encoder reduces a bit rate of a uniform digital signal, which is coded using 14-bit with 16 kHz sampling, to 64 kbps (or 56 or 48 kbps). G.722 decoder performs the reverse operation to the encoder. It can be effectively used for audio and speech compression in speech storing, digital circuit multiplication and telephony applications.

Features

  • Fully bit exact with ITU-T G.722
  • Based on Sub-Band Adaptive Differential Pulse Code Modulation (SB-ADPCM) algorithm
  • 3 bitrates supported: 48, 56, or 64 kbps
  • Input/output samples format: Linear PCM, 16 kHz, 14 bits.
  • 50…7000Hz coding bandwidth
  • Sample-by-sample or block based analog input
  • Simple application interface
  • eXpressDSP compliant. Code is reentrant, supports multithreading and dynamic memory allocation

To integrate SPIRIT G.722.1 into your video conferencing application or service please send us a request at sales@spiritdsp.com

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