Kwizaziso zedijithali, iileta ze-AMR zifutshane ukuba i- A daptive M ulti- R idle kwaye ihambelane nefomathi yomsindo we-AMR. Le fom efomathiweyo yefayile, eyayiqala ukukhutshwa ngo-1999, iyasebenza ngokugqithiseleyo ekucwangciseni nasekugcineni ukurekhodwa kwezwi xa kuthelekiswa namafomathi aqhelekileyo afana ne- MP3 , iWMA kunye ne- AAC umzekelo. Ifomati elahlekileyo kunye neefayile eziqhelekileyo ezichongiweyo nge-extension yamam. - ngaphandle kwelo mgaqo kukuba ifomathi ye-3GP ingasetyenziselwa ukugcina imilambo ye-AMR kunye nevidiyo. Ngokuqinisekileyo, lolu hlobo lweendlela zokubhala ngegama ngamanye amaxesha libizwa ngokuba yi-vocoding.
Iinguqulelo ze-AMR Narrowband kunye neWideband
Kukho imilinganiselo emibili yefom ye-AMR e-AMR-NB kunye ne-AMR-WB. Iyokuqala (i-AMR-NB), ingumngqamaniso omncinci oqhelekileyo usetyenziswa kwiimeko apho izitrate eziphantsi zaneleyo - njengeziko lokurekhoda kwezwi elingenakho kwi- MP3 player . Ibanga lexesha eliqhelekileyo elisetyenziselwa i-AMR-NB ngu-300-3400 i-Hz enokukwazi ukuvelisa umgangatho ozwakalayo onokufaniswa nomnxeba wendabuko. Le ngqungquthela ye-narrowband isebenzisa le bitrate ezilandelayo:
- 04.75 kbps
- 05.15 kbps
- 05.90 kbps
- 06.70 kbps
- 07.40 kbps
- 07.95 kbps
- 10.20 kbps
- 12.20 kbps
Ingqungquthela yesibini ye-AMR luhlobo lwe-wideband olumelelwe ngesivakalisi, i-AMR-WB. Njengoko igama liza kuphakamisa, eli lizwi eliphuculweyo elisebenzisa umgama ongaphezulu kwe-AMR-NB ukwenzela ukugcina ilizwi ngelizinga eliphakamileyo kakhulu - ububanzi bezityalo ezisetyenzisiweyo kukuba le 50 -7000 Hz. Iibhitrate ezisetyenziselwa i-wideband version ye-AMR zi:
- 06.60 kbps
- 08.85 kbps
- 12.65 kbps
- 14.25 kbps
- 15.85 kbps
- 18.25 kbps
- 19.85 kbps
- 23.05 kbps
- 23.85 kbps
Ngenxa yoluhlu lwamaxesha aphakamileyo aphezulu kwaye ngoko ke ikhwalithi yentetho ephakamileyo, i-AMR-WB ilungiselwe ukusetyenziswa kwi-GSM (iNkqubo yeSizwe ye-Mobile Communications) kunye ne-UMTS (i-Universal Mobile Telecommunications System) ubuchwepheshe - enye into eyaziwa ngokuba yi-2G ne-3G amanethiwekhi omnxeba ngokulandelanayo.
AMR Vs. I-MP3 yeRekhodi yezwi
Nangona iifomati ye-MP3 mhlawumbi iyona ifayili evelele kakhulu, ikhona ingabalulekanga ngokuthe ngqo (xa kuthelekiswa ne-AMR) xa kuthethwa ukuthetha ngekhowudi. Ifomathi ye-AMR, ngakolunye uhlangothi, ibaluleke kakhulu kumsebenzi onjalo kwaye ifomathi ekhethiweyo nangona ingaxhaswanga ngokubanzi yi-hardware kunye nesofthiwe.
Isicelo esona siqhelekileyo se-AMR ukuba ufumaneke kumculo wedijithali usebenzisa idivayisi ephathekayo (njengomdlali we-MP3 okanye i-smartphone) ukuthatha isandi; abaninzi abadlali be-MP3 kule mihla banokuphinda kabini njengoko abarekhoda bezwi basebenzisa i-microphone ekwakhiweyo. Ukuze usebenzise ngokufanelekileyo umgcino we-MP3 player of limited storage - ngakumbi ukuba i-flash based-umenzi wefowuni unokukhetha ukusebenzisa ifomathi ye-AMR. Iifayile kwifomathi ye-AMR zincinci kakhulu kwisilinganiso ngaphezu kweefomathi ezithandwa kakhulu ukugcina umculo - njenge MP3, AAC, WAV, kunye ne-WMA ngokomzekelo.