模拟信号到数字信号的转换的英文

模拟 imitate; copy
信号 signal; semaphore; gun
到 39
数字信号 digital signal
的 4次方是 The fourth power of 2 i ...
转换 change; transform; convert; ...
数字信号到模拟信号的转换 d/ac
数字信号转换 digital signal conversion
模拟信号转换器 analog signal converter; asc
数字信号转换器 dsc digital signal converter; signal converter
模拟信号 analog signals; analogsignal; analogue signal; dummy signal; model signal; quasi-analog signal; simulated signal; simulating signal; synthetic signal
模拟信号链 analog signal link
拟模拟信号 quasianalog signall
准模拟信号 quasi-analog sigmoid-procto-anoscope
数字信号的判决瞬时 decision i tant of digital signal; decision instant of digital signal
数字信号的时间调制 digital time modulation
数字信号的有效瞬时 significant i tants of a digital signal; significant instants of a digital signal
数字信号 digit signal; digital signals; ds digital signal; numeral signal; numerary signal; numerical signal
数字信号谱 digital signal spectrum
数字信号图 digital signaling diagram
调相模拟信号 phase modulation analog
话音模拟信号 voice analog signal
模拟信号触点 contact for analog signal
模拟信号处理 analog signal processing; ash
模拟信号传输 analog signal transmission

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In this paper , we briefly introduced the performance of wave coding and vocoder , emphasizedly studied the principle and performance of variable rate vocoder q4401 , including the internal construction and pins , qcelp coder & vocoder , pcm interface , cpu interface initialization process , command format and so on . we also designed a application circuit , with the experiment validated its performance . in this design , the pcm interface chip is tp3057 , it was used to finish a / d transform , the compress coding was finished by q4401 , the initialization and control were accomplished by 8051 singlechip
重点是研究变速率语音编解码芯片q4401的工作原理及性能。其中包括q4401的内部结构及管脚、 qcelp编码方式、 pcm接口、 cpu接口、初始化过程、命令格式等，并在此基础上，设计一个实际的应用电路，通过实验，验证其性能。在设计中用pcm接口芯片tp3057来完成从模拟信号到数字信号的转换，再由q4401进行压缩编码，对q4401的初始化及控制由8051单片机来完成。