Video: PCM uncompressed yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
PCM yog txoj kev encoding feem ntau siv rau uncompressed digital audio. LaserDiscs nrog cov suab nrov muaj LPCM taug qab ntawm cov channel digital. Hauv PCs, PCM thiab LPCM feem ntau xa mus rau hom ntawv siv hauv WAV (txhais tau rau xyoo 1991) thiab AIFF audio containers (txhais tau rau xyoo 1988).
Ntawm no, yog PCM suab tsis tau compressed?
Thaum cov chaw nres nkoj ntawm lub thawv teeb saum toj thiab Blu-duab tshav / DVD players tau sau npe PCM los yog linear PCM (LPCM), lawv xa mus rau uncompressed suab cov channel es tsis yog encoded hom xws li Dolby Digital, TrueHD, DTS thiab DTS-HD. PCM tuaj yeem yog mono, lub tso suab lossis muaj ntau cov channel rau ib puag ncig suab.
Tom qab ntawd, lo lus nug yog, qhov txawv ntawm PCM thiab LPCM yog dab tsi? PCM yog pulse coded modulation, whereas LPCM yog linear mem tes coded modulation. Linear txhais tau hais tias cov nqi yog linearly spaced - qhov tseem ceeb yog ncaj qha proportionalto lub teeb liab amplitude.
Ib yam li ntawd, PCM lossis Dolby Digital puas zoo dua?
Yog lawm, PCM yog uncompressed suab, whereas DolbyDigital yog compressed, uas cuam tshuam qhov zoo rau qhov chaw. Dolby TrueHD, ntawm qhov tod tes, yog lub suab tsis zoo, zoo li cov ntaub ntawv zip, uas zoo ib yam rau PCM , hauv txoj kev xav (Kuv yuav tsis nkag mus rau hauv qhov kev sib cav). Qhov ntawd zoo li nug yog CD lub suab zoo dua tiam MP3.
PCM ntawm TV yog dab tsi?
Los ntawm Rob Kemmett. Pulse-code modulation, abbreviated" PCM , " yog ib daim ntawv ntawm cov teeb liab digital uas siv los sawv cev cov ntaub ntawv. PCM yog tus qauv suab hom ntawv rau CDs, DVDs, khoos phis tawj thiab cov xov tooj digital, thiab yog ib qho kev xaiv audioformat ntawm ntau lub TV.
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