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mpeg 1 audio layer i 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 specification 2 references 3 external links toggle the table of contents mpeg 1 audio layer i 9 languages deutsch italiano 한국어 polski português русский simple english українська 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 audio formats mpeg 1 audio layer i filename extension mp1 internet media type audio mpeg 1 audio mpa 2 initial release december 6 1991 34 years ago 1991 12 06 3 latest release iso iec 13818 3 1998 april 1998 28 years ago 1998 04 type of format lossy audio contained by mpeg es standard iso iec 11172 3 4 iso iec 13818 3 5 open format yes free format expired patents website http mpeg chiariglione org standards mpeg 1 audio mp1 formally mpeg 1 audio layer i or mpeg 2 audio layer i is a lossy audio codec and one of three audio formats included in the mpeg 1 standard for files only containing mp1 audio the file extension mp1 is used it is a deliberately simplified version of mpeg 1 audio layer ii created for applications where lower compression efficiency could be tolerated in return for a less complex algorithm that could be executed with simpler hardware requirements while supported by most media players the codec is considered largely obsolete due to wider acceptance of the more complex mpeg 1 audio layer ii mp2 and mpeg 1 audio layer iii mp3 codecs a limited version of mpeg 1 audio layer i was used by the digital compact cassette format in the form of the pasc precision adaptive subband coding audio compression codec pasc and mpeg 1 audio layer i were essentially identical except the bit rate of pasc was fixed at 384 kilobits per second the only channel configurations supported by pasc were stereo joint stereo and dual mono on prerecorded cassettes only mono was not supported because of the fixed bit rate pasc regards the padding slots that are needed for encoding at 44 1 khz stereo as dummy 6 and sets them to zero whereas the iso iec 11172 3 standard uses the extra 32 bits in each padded frame to store data specification edit mpeg 1 audio layer i is defined in iso iec 11172 3 the first version of which was published in 1993 sampling rates 32 44 1 and 48 khz bitrates 32 64 96 128 160 192 224 256 288 320 352 384 416 and 448 kbit s 7 an extension has been provided in mpeg 2 audio layer i and is defined in iso iec 13818 3 which first version was published in 1995 additional sampling rates 16 22 05 and 24 khz additional bitrates 48 56 80 112 144 and 176 kbit s 7 mp1 uses a comparatively simple sub band coding using 32 sub bands 8 references edit m nilsson november 2000 the audio mpeg media type network working group doi 10 17487 rfc3003 rfc 3003 proposed standard s casner p hoschka july 2003 mime type registration of rtp payload formats network working group doi 10 17487 rfc3555 rfc 3555 obsolete obsoleted by rfc 4855 and 4856 updated by rfc 3625 and 4629 patel k smith bc rowe la 1993 09 01 performance of a software mpeg video decoder proceedings of the first acm international conference on multimedia multimedia 93 acm multimedia new york city association for computing machinery pp 75 82 doi 10 1145 166266 166274 isbn 978 0 89791 596 0 s2cid 3773268 reference 3 in the paper is to committee draft of standard iso iec 11172 december 6 1991 iso iec 11172 3 1993 information technology coding of moving pictures and associated audio for digital storage media at up to about 1 5 mbit s part 3 audio iso 1993 retrieved 2010 07 14 iso iec 13818 3 1995 information technology generic coding of moving pictures and associated audio information part 3 audio iso 1995 retrieved 2010 07 14 philips dcc system description draft archive org philips consumer electronics b v september 1994 retrieved 14 april 2021 the padding bit indicates whether the current frame has a dummy slot 1 2 mpeg audio frame header 2003 08 03 archived from the original on 2015 02 08 retrieved 2009 05 29 mpeg 1 audio layer 1 thefreedictionary com external links edit official website sub band coding a description of sub band coding including an overview of the mp1 codec 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 v t e mpeg moving picture experts group mpeg 1 2 3 4 7 21 a b c d e g v m u h i 5 mpeg 1 parts part 1 systems program stream part 2 video based on h 261 part 3 audio layer i layer ii layer iii mpeg 2 parts part 1 systems h 222 0 transport stream program stream part 2 video h 262 part 3 audio layer i layer ii layer iii mpeg multichannel part 6 dsm cc part 7 advanced audio coding mpeg 4 parts part 2 video based on h 263 part 3 audio part 6 dmif part 10 advanced video coding h 264 part 11 scene description part 12 iso base media file format part 14 mp4 file format part 17 streaming text format part 20 laser part 22 open font format part 33 internet video coding mpeg 7 parts part 2 description definition language mpeg 21 parts parts 2 3 and 9 digital item part 5 rights expression language mpeg d parts part 1 mpeg surround part 3 unified speech and audio coding mpeg g parts part 1 transport and storage of genomic information part 2 coding of genomic information part 3 apis part 4 reference software part 5 conformance mpeg h parts part 1 mpeg media transport part 2 high efficiency video coding h 265 part 3 mpeg h 3d audio part 12 high efficiency image file format mpeg i parts part 3 versatile video coding h 266 mpeg 5 parts part 1 essential video coding part 2 low complexity enhancement video coding other mpeg dash retrieved from https en wikipedia org w index php title mpeg 1_audio_layer_i oldid 1374042240 categories audio file formats film and video technology mpeg hidden categories articles with short description short description matches 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