| MPA ???
??? ????? ???? ?????, ????? MPG ? ???? ?????? ???? ?? MPEG1
???. ?? ??? MPEG Audio Layer-1, MPEG-1 Audio Layer-2 Audio
Layer-3 (???? MP3) ??????? MPEG-1 Audio.
WMA ??? Windows Media Audio. WMA ??? ?????
????? ??? ????? ?? ??? ????????? ????? ????? MP3. ?? ?????
???? ???? ?? ???? ????? ??? ???? ????? ????? ???? ??????,
????? ???? ???? ???? ?? RA.
??? ????? MPA to wma, ??? ?? ?????? ??
????? MPA ???? ?????? ?? ????? ?????? Windows ?-DirectShow
???.
????? WMA ???? ??? ???? ????? MPA ????? WMA. ???
???? MPA, ????? ?? ??? ??????, ?? ???? ???? ?? bitrate ?????
??? ?? ?? ????. Bitrate ???? ????, ?? ???? ????? ???? ????,
????? ??? ????? ????, ??????. ??? ?? ????? ??? MPA ??? ?????
wma.
AMR ????? Adaptive Multi-Rate. AMR ??? ???
????? ????? ?? ?????? ??????. ?? ????? ????? ???? ?????, ??
???? ???? ??? ????? ????. ????? AMR ?????? ??? ??? ??????
????? ????????? ????? ?? ???-MMS ,??? ?? ???? ?? ???? ??????
???? ??????, ??? ?? ????? ??? ?????? ??? ??? ??? ?????, ????
'???, ???' ??? ???, ??? ????? AMR ??? ?????? ????? ???
???????? ?????? ?????? ??????? ?? ??? ?????? ???? ??????
????????. AMR ?? ????? ?? ?-Codec ???? ??????? ?? ?? ??? ?-GSM
3GWCDMA ??? 3GPP (3rd Generation Partnership
Project).
??? ????? amr ? WMA, ????? ?????? ?????
???.
????? ???? ???? ???? ????? ?????. ????
???? ??? ???? ????? ? NOKIA3300 ????? ?? ??????? ???? ??? ???
????? ????? ????? ???? ???? ????? ????? ?? ??? ?????. ????
???? ??? ?????? ?? ????? ??? ??? ?? ??? ?? 4 ???? ??? ???? ??
???? 600 ?? 700KB, ???? ???? ???? ???? ???? ????? ?????? ??
AMR. ???? ???? ??? ????? ??? ???? ????? ????? ?? ??????? ????
???? ???? ??? ??????? ????? ????? ??? MMF, MP3, ???
????.
??? ????? ???? ???? ? WMA, ????? ??????
codec ?? ???? ??? HDX4.
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