MP3 → AMR

Wi, e li vo planifye. De fòma yo se lossy, se konsa AMR encoder travay soti nan son ki te deja pase pa yon pass psychoacoustic, ak li tèt li desizyon yo konpoze premye set. A 192 kbps oswa pi wo a rezilta a se toujou transparan pou pifò tande. Si ou gen yon master lossless nenpòt kote, enkodaj AMR soti nan sa evite double pass tout antye. MP3 se yon fòma ki gen anpil pèt: yon modèl psikoacoustic depase frekans ki pa ka rekonèt pa zòrèy la, anjeneral nan 128 a 320 kbps. AMR se yon codec pale nan band estrech ki kouri ant 4.75 ak 12.2 kbps, ki modèl la nan traktè vokal imen an plis pase spectre son an antye.

Pa an sante. MP3 gen yon bloc metadonnées apwopriye, men AMR pa gen okenn plas pou atis, albòm, nimewo track oswa koub, se konsa étiquettes yo se abandone piske pa mangled. Konserve MP3 kòm kopi étiqueté, oswa re-étiquette apre sa ak yon zouti tankou Mp3tag oswa MusicBrainz Picard. AMR detwi mizik: bandwidth li a 8 kHz retire tout bagay ki anwo frekans telefòn, epi pa gen okenn kantite re-enkodaj ki pote li tounen.

Paske yon bò li se yon codec pale pliske yon codec mizik. Li modèlman anndan chante moun epi li dechèp tout sa ki deyò bandwidth telefòn, ki se byen pou yon memo vwa e destructive pou nenpòt ki bagay ak enstriman nan li. Konvèti lwen li pa ka refè frekans ki manke yo - yo pa janm te enkode nan premye plas la. MP3 se teknikman outclassed pa AAC ak Opus nan chak bitrate, pa ka estoke plis pase de chanèl itil, ak toujou ajoute yon ti delay enkodè.

Si MP3 se lossy epi AMR se lossless (e.g. MP3 → WAV), AMR pa pi bon ke MP3 — ou pa ka rekipere enfòmasyon ki deja pèdi. Si MP3 se lossless epi AMR se lossy, codec AMR re-kompression; a 192 kbps rezilta a se transparan pou pifò kontni.

Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.

Pa default, wi — 48 kHz MP3 rete 48 kHz nan AMR. Si ou bezwen fè yon downsampling pou konpatibilite (96 kHz → 44.1 kHz pou gravye CD), opsyon sampling-rate applique yon resampling bon kalite nan menm pase enkodaj la.

Not in this step. The converter has no loudness setting and leaves the level as it is. To even out the volume, run the finished AMR through a Normalize tool on this site.

MP3 plays almost everywhere. AAC plays on Apple devices, most Android phones and Sonos. FLAC plays on Sonos and Android but not on older iPods, and WAV plays on nearly everything but makes large files. There are no device presets on this page, so choose the target format your player supports. AMR fè enskri vwa absurdement ti - yon èdtan nan pale ka mete nan kèk megabytes - ak se sa anpil telefòn toujou enskri apèl nan.

Yes. Uploaded MP3 files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted AMR are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.