G.719 is an ITU-T standard audio coding format providing high quality, moderate bit rate (32 to 128 kbit/s) wideband (20 Hz - 20 kHz audio bandwidth, 48 kHz audio sample rate) audio coding at low computational load. It was produced through a collaboration between Polycom and Ericsson.[1]
G.719 is based on modified discrete cosine transform (MDCT) coding.[2] It incorporates elements of Polycom's Siren22 codec (22 kHz) and Ericsson codec technology, as well as Polycom's Siren7 and Siren14 codecs (G.722.1 and G.722.1 Annex C), which have been used in videoconferencing systems for many years. As ITU-T Recommendation G.719, it was approved on June 13, 2008.[3][4]
G.719 is optimized for both speech and music. It is based on transform coding with adaptive time-resolution, adaptive bit-allocation and low complexity lattice vector quantization. The computational complexity is quite low (18 floating-point MIPS) for an efficient high-quality compressor. The codec operates on 20 ms frames, and the algorithmic delay end-to-end is 40 ms. The encoder input and decoder output are sampled at 48 kHz.
In addition to the nominal bit rates of 32, 48 and 64 kbit/s, the G.719 codec has an inherent feature of flexible rate selection. In fact, it is possible to accommodate any rate between 32 kbit/s and 64 kbit/s by steps of 4 kbit/s. Moreover, the codec can also provide higher rates than 64 kbit/s and up to 128 kbit/s.
Amendment 1 of the ITU-T G.719 specification defined the use of the ISO base media file format (ISO/IEC 14496-12 a.k.a. MPEG-4 Part 12) as container for the G.719 bitstream. It also defined stereo and multichannel use of G.719 bitstreams in the ISO base media file format. It addresses non-conversational use cases of the codec (e.g. call waiting music playback and recording of teleconferencing sessions, voice mail messages).[1] Thus, media file formats such as MP4 (audio/mp4 or video/mp4) and 3GP (audio/3GPP and video/3GPP) can contain G.719-encoded audio.[5]
G.719 is licensed by Polycom, Inc. and by Ericsson; both licenses are necessary for use. Polycom licensees also receive the right to use G.722.1 (Siren7, Polycom's 7 kHz codec), and G.722.1 Annex C (Siren14, the 14 kHz equivalent).
^ ab"G.719: Low-complexity, full-band audio coding for high-quality, conversational applications". www.itu.int. from the original on 2021-06-13. Retrieved 2021-06-13.
^Britanak, Vladimir; Rao, K. R. (2017). Cosine-/Sine-Modulated Filter Banks: General Properties, Fast Algorithms and Integer Approximations. Springer. pp. 31, 478. ISBN9783319610801.
^"Polycom Siren 22". Polycom, Inc. Retrieved 2009-09-07.
^"G.719: The First ITU-T Standard for Full-Band Audio" (PDF). Polycom, Inc. April 2009. Retrieved 2009-09-07.
^RFC 5404 - RTP Payload Format for G.719, Page 18, Retrieved on 2009-06-17
External linksedit
Official ITU-T G.719 standard
RFC 5404 - RTP Payload Format for G.719
December 04, 2023
standard, audio, coding, format, providing, high, quality, moderate, rate, kbit, wideband, audio, bandwidth, audio, sample, rate, audio, coding, computational, load, produced, through, collaboration, between, polycom, ericsson, based, modified, discrete, cosin. G 719 is an ITU T standard audio coding format providing high quality moderate bit rate 32 to 128 kbit s wideband 20 Hz 20 kHz audio bandwidth 48 kHz audio sample rate audio coding at low computational load It was produced through a collaboration between Polycom and Ericsson 1 G 719 is based on modified discrete cosine transform MDCT coding 2 It incorporates elements of Polycom s Siren22 codec 22 kHz and Ericsson codec technology as well as Polycom s Siren7 and Siren14 codecs G 722 1 and G 722 1 Annex C which have been used in videoconferencing systems for many years As ITU T Recommendation G 719 it was approved on June 13 2008 3 4 G 719 is optimized for both speech and music It is based on transform coding with adaptive time resolution adaptive bit allocation and low complexity lattice vector quantization The computational complexity is quite low 18 floating point MIPS for an efficient high quality compressor The codec operates on 20 ms frames and the algorithmic delay end to end is 40 ms The encoder input and decoder output are sampled at 48 kHz In addition to the nominal bit rates of 32 48 and 64 kbit s the G 719 codec has an inherent feature of flexible rate selection In fact it is possible to accommodate any rate between 32 kbit s and 64 kbit s by steps of 4 kbit s Moreover the codec can also provide higher rates than 64 kbit s and up to 128 kbit s Amendment 1 of the ITU T G 719 specification defined the use of the ISO base media file format ISO IEC 14496 12 a k a MPEG 4 Part 12 as container for the G 719 bitstream It also defined stereo and multichannel use of G 719 bitstreams in the ISO base media file format It addresses non conversational use cases of the codec e g call waiting music playback and recording of teleconferencing sessions voice mail messages 1 Thus media file formats such as MP4 audio mp4 or video mp4 and 3GP audio 3GPP and video 3GPP can contain G 719 encoded audio 5 RFC 5404 defined media type audio G719 Contents 1 Licensing 2 See also 3 References 4 External linksLicensing editG 719 is licensed by Polycom Inc and by Ericsson both licenses are necessary for use Polycom licensees also receive the right to use G 722 1 Siren7 Polycom s 7 kHz codec and G 722 1 Annex C Siren14 the 14 kHz equivalent See also editComparison of audio formats List of codecsReferences edit a b G 719 Low complexity full band audio coding for high quality conversational applications www itu int Archived from the original on 2021 06 13 Retrieved 2021 06 13 Britanak Vladimir Rao K R 2017 Cosine Sine Modulated Filter Banks General Properties Fast Algorithms and Integer Approximations Springer pp 31 478 ISBN 9783319610801 Polycom Siren 22 Polycom Inc Retrieved 2009 09 07 G 719 The First ITU T Standard for Full Band Audio PDF Polycom Inc April 2009 Retrieved 2009 09 07 RFC 5404 RTP Payload Format for G 719 Page 18 Retrieved on 2009 06 17External links editOfficial ITU T G 719 standard RFC 5404 RTP Payload Format for G 719 Retrieved from https en wikipedia org w index php title G 719 amp oldid 1039401039, wikipedia, wiki, book, books, library,
