Qhov sib txawv tseem ceeb ntawm kev sib txawv thiab cov khoom tsis sib xws yog qhov sib npaug ntawm qhov sib npaug ntawm qhov ntau thiab tsawg thaum, nyob rau hauv nonuniform quantization, cov kauj ruam ntau thiab tsawg tsis sib npaug. Lwm qhov tseem ceeb ntawm qhov sib txawv ntawm qhov tsis sib xws thiab cov khoom tsis sib xws yog tias, nyob rau hauv cov khoom sib xws, qee qhov yuam kev ntawm quantization tuaj yeem tshwm sim, tab sis nonuniform quantization txo qhov quantization yuam kev.
Cov kab ke sib txuas lus xa cov teeb liab ntawm lub tshuab xa mus rau tus txais. Cov teeb liab no yog analog signals. Feem ntau, cov teeb liab analog tuaj yeem cuam tshuam kev cuam tshuam thiab cuam tshuam thiab lwm yam. Yog li ntawd, cov teeb liab analog tau hloov mus rau cov teeb liab digital. Cov txheej txheem no hu ua digitization. Feem ntau, cov teeb liab digital yog qhov tseeb, raug thiab muaj qhov cuam tshuam tsawg kawg nkaus. Quantization yog ib kauj ruam hauv cov txheej txheem digitization.
Quantization yog dab tsi?
Thaum digitizing, thawj kauj ruam yog coj mus kuaj lub teeb liab ntawm lub sijhawm tsis tu ncua. Yog tias lub sijhawm ua piv txwv lossis lub sijhawm ua piv txwv yog Ts ces qhov piv txwv lossis zaus (fs) yog 1 / Ts. Rau lub teeb liab kom rov tsim dua raws nraim, tus qauv piv txwv (fs) yuav tsum ntau dua ob npaug ntawm qhov ntau zaus.
Cov kauj ruam tom ntej yog qhov quantization. Nws muab ib tug finite discrete tus nqi rau cov qauv. Cov cuab yeej ua haujlwm quantization yog quantizer. Nws yuav siv cov tswv yim coj mus kuaj thiab ua kom cov zis ntau. Qhov zoo ntawm quantizer tso zis yog nyob ntawm tus naj npawb ntawm quantization theem. Tsis tas li ntawd, qhov chaw nruab nrab ntawm ob qib quantization uas nyob ib sab hu ua kauj ruam loj. Hauv daim duab hauv qab no, cov kab khiav ceev sawv cev rau qib quantization.
Daim duab 01: Quantization
Muaj ob hom quantization nyob ntawm cov kauj ruam loj. Lawv yog uniform quantization thiab non-uniform quantization. Qhov sib npaug kom pom cov kauj ruam loj (d) yog muab hauv qab no. Xmax yog tus nqi siab tshaj plaws ntawm lub teeb liab thiab Xmin yog qhov tsawg kawg nkaus tus nqi ntawm lub teeb liab. Tus L yog tus lej ntawm qib uas faib cov teeb liab.
Uniform Quantization yog dab tsi?
Uniform quantization muaj qhov sib npaug sib npaug ntawm qib quantization. Ntxiv mus, muaj ob hom nyob rau hauv uniform quantization. Lawv yog mid-tread thiab mid-rise quantization. Ob qho no yog symmetrical ntawm keeb kwm. Nyob rau hauv nruab nrab xov quantization, lub hauv paus chiv keeb nyob rau hauv nruab nrab ntawm ib tug tread ntawm lub staircase zoo li daim duab. Qib quantization nyob rau hauv nruab nrab xov yog khib hauv tus lej. Nyob rau hauv nruab nrab-nce quantization, lub hauv paus chiv keeb nyob rau hauv nruab nrab ntawm ib tug nce ib feem ntawm lub staircase zoo li daim duab. Cov qib quantization nyob rau nruab nrab-nce txawm yog tus lej.
Nonuniform Quantization yog dab tsi?
Nyob rau hauv nonuniform quantization, cov kauj ruam loj tsis sib npaug. Tom qab quantization, qhov sib txawv ntawm tus nqi nkag thiab nws cov nqi quantized yog hu ua quantization yuam kev. Raws li hais saum toj no, nyob rau hauv uniform quantization, cov kauj ruam loj yog sib npaug. Yog li ntawd, qee qhov ntawm lub teeb liab yuav tsis npog. Qhov no tuaj yeem ua rau muaj qhov yuam kev ntau ntxiv.
Txawm li cas los xij, nyob rau hauv cov ntaub ntawv ntawm nonuniform quantization, cov kauj ruam loj hloov yog li nws yuav muaj qhov yuam kev yam tsawg kawg nkaus. Tom qab ua tiav qhov quantization, cov kauj ruam tom ntej yog encoding. Nws txhais txhua qib quantization los ntawm binary code.
Qhov txawv ntawm Uniform thiab Nonuniform Quantization yog dab tsi?
Uniform Quantization yog hom quantization nyob rau hauv uas cov qib quantization yog uniformly spaced yog Uniform Quantization. Nonuniform Quantization yog hom quantization uas cov qib quantization tsis sib npaug yog Nonuniform Quantization.
Ntxiv mus, Uniform quantization muaj qee qhov yuam kev quantization. Tab sis, Nonuniform quantization txo quantization yuam kev.
Summary – Uniform vs Nonuniform Quantization
Kab lus no tau tham txog qhov sib txawv ntawm ob hom quantization uas tsis sib xws thiab tsis sib xws. Qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov tsis sib xws yog qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug thaum qhov sib npaug ntawm qhov tsis sib xws tsis muaj qhov sib npaug.
