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Gen videyo ki nan de kalite MPEG2 nan koòdone nan transmisyon aktyèl DVB-C Kòd ekipman sistèm éfuzyon transmèt estanda koòdone: asenkron se seri asi koòdone ak SPI nan koòdone synchronous ak garanti.
SPI tout ansanm gen siyal 11 ki itil, se chak siyal pòv santim itilize nan de siyal ogmante bon jan kalite transmisyon rejè entèferans, transmèt ak DB25 sou lyen fizik, paske sa a konekte yon liy anpil ak konplèks, distans transmisyon se ti bout tan, parèt fasil pann. Men, SPI se kolateral 11 siyal, pwosesis la senp epi li èkspansibilite se fò, D 'a nan pwodiksyon an nan paske sa se kounye a jeneral MPEG2 videyo xslt ak videyo dekodaj se SPI koòdone siyal nan estanda la.
Asi yo itilize seri transmèt, bezwen yon kab kowaksyal transmèt sèlman, konekte yon liy ki senp, distans transmisyon long. Dapre domaj la aktè ak SPI ak asi respektif, souvan vle gen tranzisyon an mityèl nan koòdone SPI ak asi lè siyal transmisyon.
1, SPI estrikti siyal
SPI nan sistèm transmisyon kolateral gen ladan siyal nan siyal nan yon revèy, 8 siyal done, yon senkronizasyon ankadreman ak yon done siyal efikas. 047H nan multiple synchronous ki TS korespondans yo nan siyal synchronisation ankadreman vlope, siyal efikas itilize done longè a ki TS divisions gen ladan se multiple 188 oswa multiple 204. Lè sak TS ap grandi multiple 188, siyal efikas se done tout tan tout tan n nan wo, an menm tan an tout siyal kenbe synchronous ak siyal revèy.
2, asi koòdone
Asi transmèt kouran ka gen diferan done pousantaj, men to transmisyon se konstan, pou 270Mbps, paske sa a asi se OK, ap voye epi resevwa done yo MPEG2 nan to diferan. Se asi sistèm transmisyon statified estrikti. ISO / IEC 13818 nan estanda nan kouch nan tèt 2nd, sèvi ak MPEG2 - 1 (sistèm), 0th a melanje 1st a se kanal la fib FC ki baze sou 1SO / IEC CD 14165-1. FC sipòte yon varyete de fizik transmèt ajans, si se kowaksyal kab transmèt, rete tann.
8bit a ki pral genyen ladan synchronous pake deferant MPEG2 pi wo a tout pil moute yon mo lè yo chanje yo nan 10bit anpile yon mo; Fè nan Lè sa a, ak / lè stringing ansanm conversions, D 'yon nouvo mo lè kondisyon an, ak lè done sous pa gen vinn pare, yo ta dwe mete yon K pawòl Bondye a synchronous nan 28.5, transmèt pousantaj yo nan lòd reyalize 270Mbps yo fiks de asi. Fòm koule ti jan seri ap pase amortisman / kondwi sikwi ak rezo kouti, voye bay Connector kab kowaksyal. Ta dwe rive nan koule nan kab kowaksyal, nan resevwa lè k ap resevwa done, vle pase Connector ak rezo kouti pi wo a tout, kouti rive sou kous la ki retabli revèy ak done, antreprann stringing ansanm pwochen / altènatif; Pou retabli multiple senkronism, asi dekodaj dwe chache K28.5 synchronous mo premye, yon fwa rechèch mo sa a senkronism, li se delimiter nan done ki resevwa fwontyè imedyatman savwa atrib, bati dekodaj pwodiksyon multiple ki kòrèk la nan multiple pou fè aranjman pou kidonk; antreprann ranplasan 10 / 8bit finalman, MPEG2 kòd la TS ki retabli senkronism bay yon pake reskonsab done. Men, K28.5 mo synchronous se pa disponib done, paske yo dwe efase lè sa a Decoder.
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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zh-CN.fmuser.org -> Chinwa (senplifye)
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