Mu audio digital, makalata AMR ndi ochepa kwa A zovuta M ulti- R kudya ndi zofanana ndi AMR audio maonekedwe. Mawonekedwe a fayilowa, omwe anamasulidwa koyamba mu 1999, ndi othandiza makamaka pakukakamiza ndi kusunga ma voti poyerekeza ndi mawonekedwe omwe amawoneka ngati MP3 , WMA , ndi AAC mwachitsanzo. Ndiyotayika ndi maofesi omwe amadziwika ndi extension .amr - kupatula pa lamulo ili ndikuti mawonekedwe a galasi 3G angagwiritsidwe ntchito kusungirako mitsinje ya AMR pamodzi ndi kanema. Mwachidziwitso, mtundu uwu wa njira yojambula mawu nthawi zina umatchedwa kuti vocoding.
AMR Narrowband ndi Wideband matembenuzidwe
Pali zigawo ziwiri za AMR zomwe zili AMR-NB ndi AMR-WB. Choyamba (AMR-NB), ndi narrowband version yomwe nthawi zambiri imagwiritsidwa ntchito pamene zinthu zotsika zotere zili zokwanira - monga mawu oyamba ojambula omwe mungakhale nawo pa MP3 . Mafupipafupi omwe amagwiritsa ntchito AMR-NB ndi 300-3400 Hz omwe amatha kupanga khalidwe labwino lomwe likufanana ndi foni yachikhalidwe. Njira yaying'onoyi ikugwiritsa ntchito zotsatirazi:
- 04.75 kbps
- 05.15 kbps
- 05.90 kbps
- 06.70 kbps
- 07.40 kbps
- 07.95 kbps
- 10.20 kbps
- 12.20 kbps
Mndandanda wachiwiri wa AMR ndi mtundu wa broadband umene umaimiridwa ndi mawu akuti AMR-WB. Monga dzina lingatanthauzire, ili ndi mawu owonjezera omwe amagwiritsira ntchito chiwerengero chachikulu kuposa AMR-NB kuti asunge mawu pamtunda wapamwamba kwambiri - njira yomwe amagwiritsiridwa ntchito pafupipafupi ndi iyi-50 -7000 Hz. Mafuta omwe amagwiritsidwa ntchito pa widband version ya AMR ndi awa:
- 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
Chifukwa chapamwamba pafupipafupi komanso chifukwa chapamwamba kwambiri, AMR-WB imakonzedwanso kuti ikhale yogwiritsidwa ntchito mu GSM (Global System for Mobile Communications) ndi ma technology technologies a UMTS (Universal Mobile Telecommunications System) - omwe amadziwika kuti 2G ndi 3G mafoni othandizira.
AMR Vs. MP3 kwa Voice Recordings
Ngakhale kuti MP3 ndi mtundu wotchuka kwambiri wa ma audio, sizowonjezera bwino (poyerekeza ndi AMR) ponena za kulankhula. Mpangidwe wa AMR, pambali inayo, ndi wabwino kwambiri pa ntchito yotereyi ndipo ndi mawonekedwe osankhidwa ngakhale kuti sali othandizidwa kwambiri ndi hardware ndi mapulogalamu.
Ntchito yowonjezereka ya AMR yomwe mungathe kuigwiritsa ntchito mu nyimbo za digito ikugwiritsa ntchito chipangizo chowonekera (monga MP3 kapena foni yamakono) kuti mulandire phokoso; ambiri osewera ma MP3 masiku awa akhoza kuwirikiza ngati ojambula mawu akugwiritsa ntchito microphone yokhazikika mkati. Kuti mugwiritse ntchito bwino sewero la MP3 loperewera - makamaka ngati kuunika kogwiritsa ntchito- wopanga chipangizocho angasankhe kugwiritsa ntchito mawonekedwe a AMR. Ma fayilo a AMR amawoneka ochepa kwambiri kuposa mawonekedwe otchuka omwe amagwiritsidwa ntchito kusunga nyimbo - monga MP3, AAC, WAV, ndi WMA mwachitsanzo.