Bit rate - abin da yake da shi? mafi kyau bitrate

Music kuma fina-finai son su saurari da kuma kula da dukan kõme. Wannan hadawa audio da video files? Tsare-tsare ne daban-daban, da Wa'adinku shi ne ma daban-daban. Amma akwai wani ra'ayi cewa shi ne na kowa a cikin wadannan biyu lokuta. Wannan siga da aka kira da bitrate. Mene ne wannan?

Basic bayanai

Don gane da wannan ra'ayi, ya kamata ka yi tunani game da babban hanyoyi na coding da kuma audio matsawa. A Carlsbad, Jamusawa masana kimiyya na farko samarwa da wani ingantaccen audio matsawa algorithm cewa ya ba da fitarwa fayiloli ne quite m quality. A Hanyar samarwa da su shi ne cewa tushen fayil da aka yanke guntu-guntu na 50 ƴan daƙiƙa, duk wadannan da wani ɓaɓɓake kara bincikar dabam.

Don wannan karshen, da sauti da aka yada a kan Fourier harmonics. Shiryar da sakamakon safiyo na likitoci da kuma masana kimiyyar daga dama jefa duk mitoci da cewa kunnen da talakawan mutum ba ya ji. Alal misali, sau da yawa cire wasu taushi sauti a kan bango na m ƙungiyar makaɗa. Bugu da kari, cikin sarari-ceto yanke ma dogon pauses tsakanin sake kunnawa.

Kamar yadda wani na farko "raw" yana amfani da wani misali WAV format dijital audio. Yana Stores cikakken bayani game da asalin sauti, kamar yadda ta dijital Replica. Digitization a cikin wannan format faruwa a mita na 44 kHz. Yana amfani da WAV riga tsaoho audio-CD. Haka kuma, da sake kunnawa ne kawai da kishiya fasalin na rubuta bayanai, tare da sakamakon cewa ya jũya music.

Rikodi karin bayanai

Bayani game da "yanke-kashe" harmonics rubuce a cikin generated fayil wanda size ne da yawa karami fiye da asali. Hakika, shi ma yana da sauti ne da nisa daga cikakken wasa da tushen abu. Amma idan rufewar da aka yi a hankali, cikin mutum kunne ba zai iya ji bambanci. A sa'an nan za mu koma ga manufar bitrate. Mene ne wannan?

definition

Wannan ne adadin data canjawa wuri, da kuma canja wuri ne alaka da wani takamaiman lokaci tazara. Saboda haka, wannan ra'ayi kai tsaye nuna adadin data cewa an "jefa daga" na tushen fayil. A bit kudi ne kasa, da karami da sakamakon fayil kamar yadda aka cire daga kusan duk "karin" harmonics.

Suna auna a kilobits da na biyu (kbps), da kuma audio coding a fina-finan sau da yawa amfani megabits da biyu (Mbps). Idan muka magana game da classic MP3, mafi m za a iya daukan wani 128 kbps bitrate. Abin da ake nufi?

Gaskiyar cewa daukan samfur rate - iyaka bayan da sauti fara muhimmanci deteriorate. Hakika, shigar wanda ke aiki tare da taimako na wasanni na opera mawaƙa ba lallai ba ne, amma song pop divas encode da bitrate aka ba musamman kaskantar da ingancin sauti.

Musamman m wannan bambanci lokacin sauraron online rediyo a kan Internet. Stations cewa amfani da bitrate 48kbps da 128 kbps The hanya a kan, sauti quite daban.

Abin da suke?

Akwai iri biyu: m (CBR) da kuma m (VBR). Wannan yana da muhimmanci musamman a lokacin da shigar da bidiyo: idan da akai bit kudi da aka yi amfani da, na biyu fim za a matsa yin amfani da akai adadin bayanai. Hakika, bambanci tsakanin tsauri da kuma a tsaye data a cikin wannan harka, ba. Idan darajar wani m, sa'an nan da low-motsi scenes za a rikidadde yin amfani da ƙaramar yawan albarkatun.

A irin wannan algorithm aka yi amfani da daidaitattun tsaren na matsa video. Saboda haka, wata al'ada MPEG ba wani babba riba a cikin adadin fitarwa fayil domin sauki dalilin cewa na nazarin da pruned kowane firam.

Wannan manufa ta dogara ne a kan gaskiyar cewa jinkirin scene canjãwa bambanci tsakanin Frames ne low, amma saboda mafi yawansu ba su za a iya tsanani Sauki, wajen rage yawan fitarwa file size. A kaifi guda frame canjawa haka ba aiki, sabili da haka dole amfani da mafi girma bit kudi. Idan ka encode wani movie, ko music amfani da m darajar, da annabta size na fitarwa fayil zama ba zai yiwu ba: cikin kwamfuta iya ba kawai sosai m kimanta.

mafi kyau darajar

Za ka iya haƙĩƙa tambayi tambaya game da abin da darajar zai zama mafi kyau duka. Bari mu yi kokarin amsa wannan tambaya.

Mun riga ya bayyana cewa, a ƙananan iyaka aka dauke su alama a 128 kbps The, damfara da fayiloli amma har yanzu ba kyawawa to irin wannan size kamar yadda rasa mafi yawan amfani bayanai. Mafi yawa daga cikin music masoya yi imani da cewa mafi kyau duka bit rate - shi ne 192 kbps. Hakika, a mafi yawan lokuta, a dauke su mafi kyau darajar a 320 kbps, amma wani gagarumin bambanci, shi ba ya bada.

A duk ya dogara da kayan aiki!

Hakika, "dumi tube sauti" jawabin, ba za mu gudanar, amma a kan mai kyau acoustics ku da sauri rarrabe kunne fayiloli matsa tare da daban-daban quality. Idan shafi iya a al'ada haifa da cikakken kewayon high da kuma low mitoci lokacin wasa akwai babban adadin kayayyakin gargajiya da cewa batu to yanke fitar da wani yawa harmonics.

Hakika, da muhimmancin da Wayar salula na farko al'amurran da suka shafi wani bambanci tsakanin 64 da 128 kbps aka ba su gani ba, amma cikin zamani mobile kayan aiki da aka sanya na da yafi high quality-aka gyara.

Zabi da hakkin darajar!

Kullum, za ka iya damfara da fayil lafiya, idan su yi tunanin abin da kuma yadda za ka yi amfani da shi. Alal misali, idan kana so ka damfara bidiyo game da su sa shi a Fir-version of wasan da sanda, domin mafi yawan bangare wasan sauti zai zama daidai da matsakaicin bit kudi na 92 kbps. Domin murya tsokana da kuma exclamations mafi ake bukata. A akasin wannan, ba adadin ba daraja ceton a matsawa na gargajiya music, kamar yadda in ba haka ba za ka rasa jigon da abun da ke ciki, kamar yadda mafi yawan dabara nuances za kawai yanke.

Duk da haka, a lokuta da dama, yana da hadari ga zaton cewa mafi kyau bit rate - shi ne 256 kbps. Mafi yawan] aliban da ba su sani ba daga kunne babu wani ci a kara karuwa.

Yadda za a canza darajar?

Ba haka rare shi yana iya zama dole don canja bitrate. Nan da nan, za mu lura cewa karuwa a cikin fayil size of 64 kbps The, ta hanyar mayar da shi a cikin wani audio-CD format, wawa kuma m, tun da yanke harmonics sun babu inda ba kai. Ga 'yan don damfara fayil tare da karin "nauyi", dan kadan, Munã rage ta halaye, shi ne quite yiwu.

Wanne shirin ga bitrate ne mafi kyau dace domin gida amfani? Mutane da yawa masu amfani ne mai yiwuwa saba Nero iko multimedia kunshin, wanda kuma ya hada da kayayyakin aiki, don kammala aikin tare da sauti.

Suka saba da fairly sauki dubawa, ilhama, sosai high quality music tsarinsa. Duk da haka, sayen wani kunshin (40 Tarayyar Turai) domin kamar wata kananan aikace-aikace ba ma barata. Ina optimally Easy CD-DA Extractor. A shirin da aka biya, amma akwai wata gaba daya doka version na ta free, wanda ya bambanta kawai wasu hane-hane.

Don canja bit kudi don amfani da shi, dole ne ka bude babban aikace-aikace taga ta biyu-danna ta icon hagu linzamin kwamfuta button, saka audio-CD drive, jira har sai ka ga jerin fayiloli a kan faifai a cikin maganganu akwatin. Za ka iya sa'an nan kuma latsa on RipCD button kuma saka da shirin hanya zuwa ajiye fitarwa fayiloli. All m aikin zai ci gaba a cikin cikakken atomatik yanayin, wani mai amfani da baki ake bukata.

Wannan shi ne dalilin da ya sa akwai wani bitrate. Mene ne shi, ka sani. Idan ka zabi darajar m, shi ne quite yiwu don samun matsa sauti wanda ingancin ba kula shafa.