英文書籍，Introduction.to.Mobile.telephone.Systems.1G.2G.2.5G.and.3G.Wireless.Technologies.and.Services
上傳時間： 2015-02-25
上傳用戶：hoperingcong
ITU-T Recommendation V.90 98年9月版本 A DIGITAL MODEM AND ANALOGUE MODEM PAIR FOR USE ON THE PUBLIC SWITCHED telephone NETWORK (PSTN) AT DATA SIGNALLING RATES OF UP TO 56 000 bit/s DOWNSTREAM AND UP TO 33 600 bit/s UPSTREAM
標簽： MODEM Recommendation ANALOGUE DIGITAL
上傳時間： 2014-01-17
上傳用戶：hn891122
ITU-T Recommendation T.30(2005 09) SERIES T: TERMINALS FOR TELEMATIC SERVICES Procedures for document facsimile transmission in the general switched telephone network
標簽： Recommendation Procedures TERMINALS TELEMATIC
上傳時間： 2015-06-04
上傳用戶：shizhanincc
該源代碼是有關modem 撥號，it is based on Windows telephone API (TAPI) service
上傳時間： 2014-01-08
上傳用戶：Divine
New security and control protocol for VoIP based on steganography and digital watermarking （關于ip telephone security的外文資料2006年）
標簽： steganography watermarking and security
上傳時間： 2014-06-13
上傳用戶：皇族傳媒
Application Note Abstract This Application Note introduces a complete and detailed PSoC® project. telephone Call Logger keeps the detailed record of approximately 945 phone calls (7-digit number is assumed to be one phone call) including date, start time and the duration of the phone call in the PSoC device. Users can get this detailed report into the PC environment by using free software, which is included in the project file. When records reach near full capacity of the Flash memory, an LED will turn on to show that it is necessary to backup the data. Software gets the data from PSoC, organizes it and prepares a printable version. Additionally, it sends the date and time information to the PSoC. The external parts in this project can be obtained easily in the market.
標簽： Application Note introduces Abstract
上傳時間： 2014-01-01
上傳用戶：集美慧
It is about spline word,please refer to this chapter and analysis ,then you will find how to draw spline ,if you have any problem,please contact me,my telephone is "none",haha!
標簽： analysis chapter spline please
上傳時間： 2016-03-07
上傳用戶：x4587
Abstract-The effect of the companding process on QAM signals has been under investigation for the past several years. The compander, included in the PCM telephone network to improve voice performance, has an unusual affect on digital QAM data signals which are transmitted over the same channel. The quantization noise, generated by the companding process which is multiplicative (and asymmetric), degrades the detectability performance of the outermost points of the QAM constellation more than that of the inner points. The combined effect of the companding noise and the inherent white gaussian noise of the system, leads us to a re-examination of signal constellation design. In this paper we investigate the detectability performance of a number of candidates for signal constellations including, a typical rectangular QAM constellation, the same constellation with the addition of a smear-desmear operation, and two new improved QAM constellation designs with two-dimensional warpi
標簽： investigation Abstract-The companding the
上傳時間： 2013-12-20
上傳用戶：英雄
The files in this directory comprise ANSI-C language reference implementations of the CCITT (International Telegraph and telephone Consultative Committee) G.711, G.721 and G.723 voice compressions. They have been tested on Sun SPARCstations and passed 82 out of 84 test vectors published by CCITT (Dec. 20, 1988) for G.721 and G.723. [The two remaining test vectors, which the G.721 decoder implementation for u-law samples did not pass, may be in error because they are identical to two other vectors for G.723_40.]
標簽： implementations directory reference comprise
上傳時間： 2014-01-22
上傳用戶：Breathe0125
The second edition of WiMax Operator鈥檚 Manual includes most of the material from the first edition, plus new discussions of 鈥?The ultra-high-speed mobile telephone standard, HSDPA 鈥?Ultrawideband (UWB) 鈥?Changes to DSL technologies 鈥?Mobile voice 鈥?Mobile entertainment 鈥?New backup systems The new edition also reflects the changes that have occurred in the industry over the last year and half, including the emergence of restandards wireless broadband equipment with fully developed mobile capabilities, ignificant alterations in the competitive landscape, and he opening of valuable new spectrum for roadband wireless operators.
標簽： edition the Operator includes
上傳時間： 2014-01-02
上傳用戶：xiaodu1124
