简介:随着科技的发展,广播设备不断更新,MD录音机以其体积小、重量轻、携带方便、存储量大、存储介质寿命长、编辑功能强大、音质好等优点,已逐渐成为广播领域外出录音和节目编辑的主用设备之一。
简介:Inthispaper,thecapabilityofIEEE802.11bDistributedCoordinationFunction(DCF)modesupportingofConstantBitRate(CBR)andVariableBitRate(VBR)VoiceoverIP(VoIP)trafficisinvestigated.Then,thecapacityof802.11bWirelessLocalAreaNetwork(WLAN)systemcarryingvoicecallsinawiderangeofscenarios,includingvaryingdelayandpacketlossrateconstraintsisanalyzedandevaluated.BothG.711andG.729voiceencodingschemesandarangeofvoiceinter-arrivaltimeareconsidered.Theanalysesandsimulationresultsshowthatcapacityishighlysensitivetothedelaybudgetallocatedtothesumofpacketizationandwirelessnetworkdelays.Foragivenpacketlossrateconstrained,G.729isshowntohaveacapacitygreaterthanthatwhenG.711isused.ThesimulationresultsshowthatbysupportingVBRunderDCFmodethenetworkhastheapproximatelytwicemuchcapacityassupportingCBRhas,regardlessoftheencodingschemesandtheinter-arrivaltime.
简介:分析了用AT45DB161B存储数据的特点和容量,给出了采用ATMEL的串行DataflashAT45DB161B来存储行驶数据的行驶记录仪的设计方法.同时给出了W77E58和AT45DB161B的接口电路和程序代码。试验表明,采用AT45DB161B来存储数据的行驶记录仪具有体积小、容量大、功耗低、硬件接口简单、抗干扰能力强,容量扩展简单的优点。