MUNICATIONS课程名称:,,,设计,,,,,,,.;,,转换,,,打败,,,闪电,,敲,,打火,,点火装置signal-to-,地面的,parison比较起来,相对之下parameter[pə'ræmitə],,,,(译).,交错,,,独特的uniquesolution唯一解Insomeways,eachofusislikeerveyperson;andinsomeways,,再次发生1①PCMisdependentonthreeseparateoperations,sampling,quantizing,andcoding.②Manydifferentschemesforperformingthesethreefunctionshaveevolvedduringrecentyears,andweshalldescribethemainones.③Inthesedescriptionsweshallseehowaspeechchanneloftelephonequalitymaybeconveyedasaseriesofamplitudevalues,eachvaluebeingrepresented,thatis,coded,④Furthermore,(kHz).⑤Practicalequipments,however,normallyuseasamplingrateof8kHz,andif8-digitspersamplevalueareused,esrepresentedbyastreamofpulseswitharepetitionrateof64kHz.⑥-1illustratesthesampling,quantizing,
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