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g 728 wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 see also 2 references 3 external links toggle the table of contents g 728 7 languages deutsch español français 日本語 한국어 русский yorùbá edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia itu t standard for speech coding g 728 bit exact fixed point 1994 song g 728 is an itu t standard for speech coding operating at 16 kbit s it is officially described as coding of speech at 16 kbit s using low delay code excited linear prediction technology used is ld celp low delay code excited linear prediction delay of the codec is only 5 samples 0 625 ms the linear prediction is calculated backwards with a 50th order linear predictive coding filter the excitation is generated with gain scaled vq the standard was finished in 1992 in the form of algorithm exact floating point code in 1994 a bit exact fixed point codec was released g 728 passes low bit rate modem signals up to 2400 bit s also network signaling goes through the complexity of the codec is 30 mips 2 kilobytes of ram is needed for codebooks mean opinion score for g 728 is 3 61 the essence of celp techniques which is an analysis by synthesis approach to codebook search is retained in ld celp the ld celp however uses backward adaptation of predictors and gain to achieve an algorithmic delay of 0 625 ms realaudio 28 8 is a reduced bitrate variant of this standard using 15 2 kbit s 1 see also edit list of codecs comparison of audio coding formats references edit realaudio 28 8 multimediawiki wiki multimedia cx external links edit itu t g 728 page c source code for g 728 dead link v t e multimedia compression and container formats video compression iso iec mpeg dv mjpeg motion jpeg 2000 mpeg 1 mpeg 2 part 2 mpeg 4 part 2 asp part 10 avc part 33 ivc mpeg h part 2 hevc mpeg i part 3 vvc mpeg 5 part 1 evc part 2 lcevc itu t vceg h 120 h 261 h 262 h 263 h 264 avc h 265 hevc h 266 vvc h 267 enhanced compression model smpte vc 1 vc 2 vc 3 vc 5 vc 6 truemotion and aomedia truemotion s vp3 vp6 vp7 vp8 vp9 av1 av2 chinese standard avs1 p2 avs gb t 20090 2 16 avs2 p2 gb t 33475 2 gy t 299 1 hdr vivid gy t 358 avs3 p2 gy t 368 others apple video avs bink cinepak daala dvi ffv1 huffyuv indeo lagarith microsoft video 1 msu lossless oms video pixlet prores 422 4444 quicktime animation graphics realvideo rtvideo sheervideo smacker sorenson video spark theora thor ut wmv xeb yuls audio compression iso iec mpeg mpeg 1 layer ii multichannel mpeg 1 layer i mpeg 1 layer iii mp3 aac he aac aac ld mpeg surround mpeg 4 als mpeg 4 sls mpeg 4 dst mpeg 4 hvxc mpeg 4 celp mpeg d usac mpeg h 3d audio itu t g 711 a law µ law g 718 g 719 g 722 g 722 1 g 722 2 g 723 g 723 1 g 726 g 728 g 729 g 729 1 ietf opus ilbc speex vorbis flac 3gpp amr amr wb amr wb evrc evrc b evs gsm hr gsm fr gsm efr etsi ac 3 ac 4 dts bluetooth sig sbc lc3 chinese standard avs1 p10 gb t 20090 10 avs2 p3 gb t 33475 3 audio vivid gy t 363 dra gb t 22726 exac sj t 11299 4 others acelp alac asao atrac celt codec 2 isac lyra melp monkey s audio mt9 musepack optimfrog osq qcelp rcelp realaudio sd2 shn silk siren smv svopc tta true audio twinvq vmr wb vselp wavpack wma mqa aptx aptx hd aptx low latency aptx adaptive ldac lhdc llac truehd image compression iec iso ietf w3c itu t jpeg ccitt group 4 gif heic heif hevc jbig jbig2 jpeg jpeg 2000 jpeg ls jpeg xl jpeg xr jpeg xs jpeg xt png apng tiff tiff ep tiff it others av1 avif bpg djvu exr flif icer mng pgf qoi qtvr wbmp webp containers iso iec mpeg es mpeg pes mpeg ps mpeg ts iso iec base media file format mpeg 4 part 14 mp4 motion jpeg 2000 mpeg 21 part 9 mpeg media transport itu t h 222 0 t 802 ietf rtp ogg matroska smpte gxf mxf others 3gp and 3g2 amv asf aiff avi au bpg bink smacker bmp divx media format evo flash video heif iff m2ts matroska webm quicktime file format ratdvd realmedia riff wav mod and tod vob ifo and bup collaborations netvc mpeg la alliance for open media methods entropy arithmetic huffman modified lpc acelp celp lsp wlpc lossless lossy lz deflate lzw pcm a law µ law adpcm dpcm transforms dct fft mdct wavelet daubechies dwt lists comparison of audio coding formats comparison of video codecs list of codecs see compression methods for techniques and compression software for codecs retrieved from https en wikipedia org w index php title g 728 oldid 1333620848 categories speech codecs audio codecs itu t recommendations itu t g series recommendations hidden categories articles with short description short description matches wikidata articles using infobox templates with no data rows all articles with dead external links articles with dead external links from may 2025 this page was last edited on 18 january 2026 at 21 17 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents g 728 7 languages add topic