Ndeipi PCM audio uye nei ichikosha
PCM inomirira P ulse C ode M kudurudza.
PCM inoshandiswa kushandura zviratidzo zveanalogog (dzinomiririrwa ne waveforms) muzviratidzo zvekudhijara zvemashoko (izvo zvinomiririrwa ne1 uye 0's-yakafanana nemashandisi emakombiyuta) pasina kuomesa . Izvi zvinobvumira kudhindwa kwemimhanzi kana mafirimu soundtrack kuti akwanise munzvimbo duku (enzanisa hukuru hweCD kune rekodi vinyl).
PCM Basics
PCM kufanana-ku-digital audio kutendeuka kunogona kuoma, zvichienderana nezvinoenderana nekutendeuka, unhu hunodiwa kana huchidiwa, uye kuti mashoko acho akachengetwa sei, anotumirwa, kana kugoverwa. Zvisinei, hezvino zvakasikwa.
Ipa PCM file kududzirwa kwechidimbu kweinzwi remagetsi analog. Chinangwa ndechekudzokorora zvinhu zvechiratidzo cheanalogog yepamusoro zvakanyanya sezvinobvira.
Nzira iyo analog-to-PCM kutendeuka inoitwa ndeye nzira inonzi sampling. Sezvataurwa pamusoro apa, izwi reanalogog rinofamba mumafungu, apo PCM inongororwa 1 uye 0. Kuti tibate analog inzwi kuburikidza neCPM, pfungwa dzakananga pamusoro payo inonzi sound wave inofanira kushandiswa (kuwandisa). Nhamba yakawanda ye wave wave yakatorwa papi inopiwa (bits) inosanganisira chikamu chekuita. Mamwe mapepa akaiswa mutsara uye zvikamu zvikuru zvemufaro wakagadziriswa pane imwe neimwe inoreva zvakanyatsonaka pamucheto wokuteerera. Somuenzaniso, muCD audio, analog waveform sampuli 44.1 chikamu kaviri pamusi (kana 44.1kHz), ine zvikamu zvine 16bits muhupamhi (yakadzika). Mune mamwe mazwi, izwi re digital digital audio audio 44.1kHz / 16bits.
PCM Audio and Home Theatre
Rumwe rudzi rwePCM, runyararo pamwe chete nemodhuturo yemodhi (LPCM), inoshandiswa muDVD, DVD, Blu-ray Disc, uye mamwe maitiro ekuteerera audio.
Mune CD, DVD, kana Blu-ray Disc player, LPCM (inowanzozivikanwa sechiratidzo chePMM) inoverengwa kubva pa diski uye inogona kuendeswa nenzira mbiri:
- Imwe nzira ndeyokuchengetedza fomu yayo yepamusoro uye kutumira iyo chiratidzo kuimba yemitambo yakagadziriswa ne digital optical, digital coaxial , kana HDMI connection . Munhu anogamuchira ndiye anoshandura chimiro chePMM kune analogog kuitira kuti inogona kutumirwa kuburikidza nemagetsi uye kune vakurukuri. Chikonzero chiratidzo chePMM chinofanira kushandurirwa kuAnalogog ndechokuti nzeve yomunhu inoshanda nekunzwa zviratidzo zveanalogog audio.
- Nzira yechipiri ndeyeCD, DVD, kana Blu-ray Disc player kuti ichinje chimiro chePMM kudzokera kune fomu yeanalogog mukati, uye wotamisa chirevo chekufananidza chakagadzirwa patsva kumusha wemitambo kana kugamuchira stereo kuburikidza nehutano hwemazwi analogo. Muchiitiko ichi, stereo kana imba yemitambo yakagamuchirwa haafaniri kuita chero humwe humwe hutendeuko kuitira kuti iwe unzwe inzwi. Vakawanda veCD vatambi vanongopa hurumende yeanalogog kubudiswa, naizvozvo inotarisirwa kuti chiratidzo chePMM pa disc chinoshandurwa kuti analogog nomutambi mukati. Zvisinei, vamwe vatambi vCD (pamwe chete nevose vane DVD neBlu-ray Disc) vanogona kutumira pikicha yePMM audio zvakananga vachishandisa nzira ye digital optical kana digital coaxial connection. Mukuwedzera, vazhinji veDVD neBlu-ray Disc vatambi vanogonawo kutumira maCPM nehutano neHDMI connection.
PCM, Dolby, uye DTS
Chimwe chinyengeri chinowanzoitwa neDVD neBlu-ray Disc mavambo ndechekuverenga kudhindwa kweDodby Digital kana DTS manyore emhando dzemasaini. Dolby neDTS vane mavhidhiyo ekudhijisa anonyora anoshandisa coding iyo inogadzirisa ruzivo kuitira kuti inokodzera zvose zvakapoteredza mazwi audio audio digitally pane DVD kana Blu-ray Disc. Kazhinji, maDocby Digital neDTS audio asina kufanirwa anoendeswa kumusha wemitambo yekugamuchira mvumo yekuwedzera kududzira kune analog-asi pane imwe nzira.
Kana uchitanga kuvhara dhoni yacho, vakawanda vanoita DVD kana Blu-ray Disc vanogonawo kushandura mukati maDodby Digital uye DTS maziso kuCompmatic PCM, uye vozopinza chiratidzo ichocho chakanyorerwa kumusha wemitambo yemunharaunda kuburikidza nehutano hweHDMI, kana kuti shandura chiratidzo chePMM Analogog yezvinobuda mumitambo miviri kana kuti miviri yeanalogog yakabuda kune imwe imba yemitambo yakagamuchira iyo inobatanidza zvinoenderana.
Zvisinei, sezvo chiratidzo chePMM chisina kukwaniswa, zvinotora nzvimbo yakawanda yokutumira mahara. Saka, kana ukashandisa digital optical kana coaxial connection, pane nzvimbo yakakwana yekuendesa miviri miviri yePMM audio. Nokuda kweCD kutamba zvakanaka zvakakwana, asi nokuda kweDolby Digital kana DTS mifananidzo yakakomberedza iyo yakashandurwa kuCPM, unofanirwa kushandisa kubudiswa kweHDMI, sezvo inogona kutumira kusvika kumasere masere eCPM audio.
Kuti uwane zvakawanda pamusoro pekuti PCM inoshanda sei pakati peBlack-ray player uye mvumo yemitambo yemusha, shandisa Blu-ray Disc Player Audio Settings: Bitstream vs PCM .