M: The modulation error ratio, which is the ratio of the effective value of the vector magnitude to the effective value of the error magnitude on the constellation diagram (the ratio of the square of the ideal vector magnitude to the square of the error vector magnitude). Yana daya daga cikin manyan alamu don auna ingancin siginar TV na TV. Yana da girma mai mahimmanci ga sakamakon kuskuren logarithmic na karkatar da hankali a kan siginar yanayi na dijital. Ya yi daidai da siginar siginar-da-da-don-amoukar da akafi amfani da shi a tsarin Analog. Tsarin yanke hukunci ne na juriya ga rashin nasarar. Sauran alamomin iri ɗaya kamar su ƙimar kuskuren Ber bit bit, C / n Carrier-to-amoise iko, Matsakaicin Matsakaicin Matsakaicin Power, Sangara Matattara, da sauransu.
An bayyana darajar Mer da DB, kuma mafi girman darajar Mer, mafi kyawun ingancin siginar. Mafi kyawun siginar, kusancin alamomin suna zuwa matsayin da ya dace, da kuma mataimakin. Sakamakon gwajin na mer na nuna ikon mai karɓar dijital don mayar da lambar Binary, kuma akwai wata ma'ana ta hannu-da-noise mai kama da shi (s / n) ya zama mai kama da irin siginar kasuwancin. Siginar da aka tsara ta Qam-modup ne daga gaba kuma shiga gida ta hanyar hanyar sadarwa. Mai nuna alama zai zama a hankali ya lalace. Game da batun batun zane-zane na 64qam, ƙimar ƙasa mai ƙarfi ta Mer shine 286DB, zai iya tabbatar da siginar isassun gargajiya da ke haifar da ingancin USB. Idan yana da ƙasa da wannan darajar, ba za a kulle zanen zane-zane. Mer mai nuna alamar ingancin abubuwan buƙatun: don 64 / 256qam, mai amfani (sakandare shine sauƙin 40.
Muhimmancin Mer Mer ana daukar su azaman nau'i na ma'aunin SNR, da ma'anar Mer shine:
①. Ya ƙunshi nau'ikan lalacewar siginar: amo, layin mai ɗaukar ruwa, iq amplitude rashin daidaituwa, amo amo.
②. Yana nuna karfin ayyukan dijital don mayar da lambobin Binary; Yana nuna digiri na lalacewa zuwa siginar TV na Digital bayan an watsa ta ta hanyar sadarwa.
③. SNR shine sigogi sigogi, da kuma mer ne sigogi na rediyo.
Lokacin da siginar siginar siginar zuwa wani matakin, alamomin za su yanke shawara ba daidai ba. A wannan lokacin, ainihin kuskuren kuskuren bitar ber yana ƙaruwa. Rashin kuskure. Don alamu na dijital, tun lokacin da aka watsa bin Binary aka watsa, ana kiranta yawan kuskuren bit bit ƙididdiga (ber).
Ber = Kuskure bit kudi / duka bit kudi.
Ber an bayyana shi gaba daya a cikin bayanan kimiyya, da kuma ƙananan da, mafi kyau. Lokacin da ingancin siginar yana da kyau sosai, abubuwan da suka dace kafin da bayan gyara kuskuren iri ɗaya ne; Amma dangane da wasu tsangwani, ka'idar kuskure a gabani da bayan gyara kuskure sun bambanta, kuma bayan gyara kuskuren ƙarancin bit ya ragu. Lokacin da kuskuren bit shine 2 × 10-4, mosaic ya bayyana lokaci-lokaci, amma har yanzu ana iya duba shi; Mahimmin Ber shine 1 × 10-4, babban adadin mosaics sun bayyana, kuma sake kunna hoton ya bayyana. Ber mafi girma 1 × 10-3 ba za a iya gani da komai ba. Kalli. Index na da kawai darajar ma'ana kuma baya nuna matsayin kayan aikin gaba ɗaya. Wani lokacin yakan haifar ne ta hanyar karuwa kwatsam saboda tsangwama nan take, yayin da Merus gaba gaba daya. Za'a iya amfani da tsarin gaba ɗaya azaman nazarin kuskuren bayanai. Saboda haka, da mer zai iya samar da gargadi na farko don sigina. Lokacin da siginar ta rage, mer zai ragu. Tare da karuwar hayaniya da tsangwama ga wani gwargwado, mer zai rage, yayin ber ber ba ta canzawa. Sai kawai lokacin da tsangwama yana ƙaruwa zuwa wani gwargwado, Mer Ber ya fara don tabarbare lokacin da mai da ƙarfi ya ragu. Lokacin da mai da ƙarfi ya saukad da ƙofar gefen, da Ber zai sauke sosai.
Lokacin Post: Feb-23-2023