Английская Википедия:Internet Speech Audio Codec

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Шаблон:Short description Шаблон:Infobox file format Шаблон:Infobox software Шаблон:Lowercase internet Speech Audio Codec (iSAC) is a wideband speech codec, developed by Global IP Solutions (GIPS) (acquired by Google Inc in 2011).[1][2] It is suitable for VoIP applications and streaming audio. The encoded blocks have to be encapsulated in a suitable protocol for transport, e.g. RTP.

It is one of the codecs used by AIM Triton, the Gizmo5, QQ, and Google Talk. It was formerly a proprietary codec licensed by Global IP Solutions. As of June 2011, it is part of open source WebRTC project,[3] which includes a royalty-free license for iSAC when using the WebRTC codebase.[4]

Parameters and features

  • Sampling frequency of 16 kHz (wideband) or 32 kHz (superwideband)[5][6][7]
  • Adaptive and variable bit rate of 10 kbit/s to 32 kbit/s (wideband) or 10 kbit/s to 52 kbit/s (superwideband)[5][6][7]
  • Adaptive packet size 30 to 60 ms
  • Complexity comparable to G.722.2 at comparable bit-rates
  • Algorithmic delay of frame size plus 3 ms

See also

References

Шаблон:Reflist

External links

Шаблон:Compression formats Шаблон:Compression Software Implementations

Шаблон:Multimedia-software-stub

  1. Шаблон:Cite web
  2. Шаблон:Cite web
  3. webrtc.org/faq/#what-is-the-isac-audio-codec Шаблон:Webarchive.
  4. webrtc.org/license/additional-ip-grant/.
  5. 5,0 5,1 Ошибка цитирования Неверный тег <ref>; для сносок rfc-draft не указан текст
  6. 6,0 6,1 Шаблон:Cite web
  7. 7,0 7,1 Шаблон:Cite web