NF Z83-581-4-1998 Digital cellular telecommunications system (phase 2) Half rate speech Part 4 comfort noise aspect for half rate speech traffic channels (GSM 06 22 version 4 1 1).pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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