【正文】 路越走越寬，祝福我親愛的老師們身體健康，桃李滿天下！參考文獻[1]葉淦華．通信原理教程[M]．北京：中國電力出版社，2005． [2]褚振勇，齊亮，田紅心，高楷娟．現(xiàn)代通信原理及應(yīng)用[M]．西安：西安電子科技大學出版社，2006． [3]候振鵬．嵌入式C語言程序設(shè)計[M]．北京：人民郵電出版社，2006年．3675．[4]當方．微型計算機控制技術(shù)[M]．中國水利水電出版社，2001年．[5]徐士良．C語言程序設(shè)計教程[M]．北京：人民郵電出版社，2001年．[6]潘新，民王，燕芳．微型計算機控制技術(shù)[M]．電子工業(yè)出版社，2003年．75132． [7]劉保柱，蘇彥華，張宏林．System View從入門到精通[M]．北京：人民郵電出版社，2010． [8]田耕，序文波，張延偉．System View的設(shè)計與分析[M]．.北京：電子工業(yè)出版社，2007． [9]程佩青．數(shù)字信號處理教程[M]．北京：清華大學出版社，2007． [10]崔嵬．PCM通信系統(tǒng)的實現(xiàn)技術(shù)研究[M]．北京:北京理工大學，2003．[11劉松強．數(shù)字信號處理系統(tǒng)及其應(yīng)用[M]．北京:清華大學出版社，1996． [12]白鳳山，鐵勇．基于System View的多路載波通信系統(tǒng)仿真[J]．內(nèi)蒙古大學學報，2001，(04).256259． [13]周炯盤，龐沁華．通信原理[M]．北京:北京郵電大學出版社，2005．[14]羅衛(wèi)兵，孫樺，張婕．matlab動態(tài)系統(tǒng)分析及通信系統(tǒng)仿真設(shè)計[M]．西安電子科技大學出版社，2001．[15]TS320C54x Assembly Language Tools User’s Guide[M]．Texas Instruments,．[16] of Metropolian Area Network[J].IEEE Communication Magazine,2010,24(1)．[17]BrianW.CProgrammingLanguage[M].PrenticeHallPTR,1988．附錄A 科技文獻Pulsecode modulationFrom Wikipedia, the free encyclopedia PCM redirects here. For other uses, see PCM (disambiguation). Pulsecode modulation (PCM) is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in puters, Compact Discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps. Linear pulsecode modulation (LPCM) is a specific type of PCM where the quantization levels are linearly is in contrast to PCM encodings where quantization levels vary as a function of amplitude (as with the Alaw algorithm or the μlaw algorithm). Though PCM is a more general term, it is often used to describe data encoded as LPCM. Linear pulsecode modulation (LPCM) is a specific type of PCM where the quantization levels are linearly is in contrast to PCM encodings where quantization levels vary as a function of amplitude (as with the Alaw algorithm or the μlaw algorithm). Though PCM is a more general term, it is often used to describe data encoded as LPCM. A PCM stream has two basic properties that determine the stream39。s fidelity to the original analog signal: the sampling rate, which is the number of times per second that samples are taken。 and the bit depth, which determines the number of possible digital values that can be used to represent each sample.History Early electrical munications started to sample signals in order to interlace samples from multiple telegraphy sources and to convey them over a single telegraph cable. The American inventor Moses G. Farmer conveyed telegraph timedivision multiplexing (TDM) as early as 1853. Electrical engineer W. M. Miner, in 1903, used an electromechanical mutator for timedivision multiplexing multiple telegraph signals。 he also applied this technology to telephony. He obtained intelligible speech from channels sampled at a rate above 3500–4300 Hz。 lower rates proved unsatisfactory. This was TDM, but pulseamplitude modulation (PAM) rather than PCM. In 1920 the Bartlane cable picture transmission system, named after its inventors Harry G. Bartholomew and Maynard D. McFarlane, used telegraph signaling of characters punched in paper tape to send samples of images quantized to 5 levels。 whether this is considered PCM or not depends on how one interprets pulse code, but it involved transmission of quantized samples. In 1926, Paul M. Rainey of Western Electric patented a facsimile machine which transmitted its signal using 5bit PCM, encoded by an optomechanical analogtodigital converter. The machine did not go into production. British engineer Alec Reeves, unaware of previous work, conceived the use of PCM for voice munication in 1937 while working for International Telephone and Telegraph in France. He described the theory and advantages, but no practical application resulted. Reeves filed for a French patent in 1938, and his US patent was granted in 1943. By this time Reeves had started working at the Telemunications Research Establishment (TRE). The first transmission of speech by digital techniques, the SIGSALY encryption equipment, conveyed highlevel Allied munications during World War II. In 1943 the Bell Labs researchers who designed the SIGSALY system became aware of the use of PCM binary coding as already proposed by Alec Reeves. In 1949 for the Canadian Navy39。s DATAR system, Ferranti Canada built a working PCM radio system that was able to transmit digitized radar data over long distances. PCM in the late 1940s and early 1950s used a cathoderay coding tube with a plate electrode having encoding perforations, As in an oscilloscope, the beam was swept horizontally at the sample rate while the vertical deflection was controlled by the input analog signal, causing the beam to pass through higher or lower portions of the perforated plate. The plate collected or passed the beam, producing current variations in binary code, one bit at a time. Rather than natural binary, the grid of Goodall39。s later tube was perforated to produce a glitchfree Gray code, and produced all bits simultaneously by using a fan beam instead of a scanning beam. In the United States, the National Inventors Hall of Fame has honored Bernard M. Oliver and Claude Shannon as the inventors of PCM,as described in Communication System Employing Pulse Code Modulation, . Patent 2,801,281 filed in 1946 and 1952, granted in 1956. Another patent by the same title was filed by John R. Pierce in 1945, and issued in 1948: . Patent 2,437,707. The three of them published The Philosophy of PCM in 1948.Implementations PCM is the method of encoding generally used for unpressed audio, although there are other methods such as pulsedensity modulation (used also on Sup