Blackfin平台上软件传真Modem的设计与实现
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摘要
随着VoIP业务逐渐为广大消费者所熟悉,IP语音网关作为IP电话系统的重要组成部分已具备较大的市场和应用规模。传真通信作为传统的传输静态图像的手段,由于其具备一定法律效力、用户使用习惯和方便性,它仍然是公共电话网上的一个基本业务。因此在IP语音网关中集成传真的功能已成为迫切的需求。
论文结合中国科学院沈阳计算技术研究所网络与通讯实验室的自主研发项目SIPSYS蓝蜻蜓IAD-08O语音网关,简单介绍了传真机的分类以及传真通信的发展历程,研究了三类传真机通信的基本原理以及相关的ITU-T T.4、T.30协议、信源编码、信道编码以及V系列传真调制解调器标准;通过对目前IP传真研究现状的分析和总结,针对具体项目的需求提出了在SIPSYS蓝蜻蜓IAD-08O语音网关上用纯软件的方法实现存储转发传真功能;设计了传真Modem的体系结构以及各个功能模块的组成,给出了传真Modem的C语言具体实现,并针对SIPSYS蓝蜻蜓IAD-08O语音网关的软硬件平台结构对软件传真Modem进行了优化。最后给出了原型系统的测试结果。从测试结果来看,该系统性能稳定,各项性能指标都达到或超过了预期目标。
目前SIPSYS蓝蜻蜓IAD-08O语音网关已经进行小批量生产,并且在实际应用中效果良好。
With the VoIP(Voice Over Internet Protocol) service gradually familiar to consumers, IP voice gateway, as the important part of IP phone system, already has an larger size of markets and applications. As the traditional means of transmission of still images, Fax communications, because of its legal effect, user habits and convenience, is still a basic business in PSTN. Therefore, IP voice gateway integrated fax functionality has become an urgent demand.
With the project of SIPSYS Blue Dragonfly IAD-08O Voice Gateway being the research background, this paper briefly introduces the classification of fax machines and the development of fax communications, studies the basic principles of communications of G3 fax machines and the related ITU-T T.4, T.30 protocol, source coding, channel coding as well as the V series modem standards; through the study and analysis of the current status of IP fax and the project-specific requirements, puts forward the pure software solution to achieve store and forward fax functions in the SIPSYS Blue Dragonfly IAD-08O voice gateway; designs a fax modem architecture and the composition of the various functional blocks, gives a fax modem concrete realization of the C language, and for the SIPSYS Blue Dragonfly IAD-08O voice gateway hardware and software platform architecture, Fax modem software has been optimized. Finally, gives the prototype system test results. From the test results, the system performance is stable, and various performance indicators have met or exceeded target.
Present SIPSYS Blue Dragonfly IAD-08O Voice Gateway has been carrying out small-volume production, and has a good results in practical application.
论文结合中国科学院沈阳计算技术研究所网络与通讯实验室的自主研发项目SIPSYS蓝蜻蜓IAD-08O语音网关,简单介绍了传真机的分类以及传真通信的发展历程,研究了三类传真机通信的基本原理以及相关的ITU-T T.4、T.30协议、信源编码、信道编码以及V系列传真调制解调器标准;通过对目前IP传真研究现状的分析和总结,针对具体项目的需求提出了在SIPSYS蓝蜻蜓IAD-08O语音网关上用纯软件的方法实现存储转发传真功能;设计了传真Modem的体系结构以及各个功能模块的组成,给出了传真Modem的C语言具体实现,并针对SIPSYS蓝蜻蜓IAD-08O语音网关的软硬件平台结构对软件传真Modem进行了优化。最后给出了原型系统的测试结果。从测试结果来看,该系统性能稳定,各项性能指标都达到或超过了预期目标。
目前SIPSYS蓝蜻蜓IAD-08O语音网关已经进行小批量生产,并且在实际应用中效果良好。
With the VoIP(Voice Over Internet Protocol) service gradually familiar to consumers, IP voice gateway, as the important part of IP phone system, already has an larger size of markets and applications. As the traditional means of transmission of still images, Fax communications, because of its legal effect, user habits and convenience, is still a basic business in PSTN. Therefore, IP voice gateway integrated fax functionality has become an urgent demand.
With the project of SIPSYS Blue Dragonfly IAD-08O Voice Gateway being the research background, this paper briefly introduces the classification of fax machines and the development of fax communications, studies the basic principles of communications of G3 fax machines and the related ITU-T T.4, T.30 protocol, source coding, channel coding as well as the V series modem standards; through the study and analysis of the current status of IP fax and the project-specific requirements, puts forward the pure software solution to achieve store and forward fax functions in the SIPSYS Blue Dragonfly IAD-08O voice gateway; designs a fax modem architecture and the composition of the various functional blocks, gives a fax modem concrete realization of the C language, and for the SIPSYS Blue Dragonfly IAD-08O voice gateway hardware and software platform architecture, Fax modem software has been optimized. Finally, gives the prototype system test results. From the test results, the system performance is stable, and various performance indicators have met or exceeded target.
Present SIPSYS Blue Dragonfly IAD-08O Voice Gateway has been carrying out small-volume production, and has a good results in practical application.
引文
[1]刘立柱.数字传真通信[M].成都:电子科技大学出版社. 2000.
[2]陈楚华,史林. IP传真的分析与改进[J].计算机与信息技术. 2006,5:21-24.
[3]陈高长艳,郑喜凤,刘维亚. CMX869在高速低功耗调制解调器中的应用[J].仪表技术与传感器. 2006,1:38-40.
[4]杨小牛,搂才义,徐建良.软件无线电原理及应用[M].北京:电子工业出版社. 2001.
[5] ITU-T Recommendation T.0. Classification of Facsimile Terminals for Doucument Transmission over the Public Networks. 1996.
[6]周子耀.传真三类机软硬件原理与应用[M].北京:电子工业出版社. 1997.
[7] Andrew S. Tanenbaum潘爱民译.计算机网络[M].北京:清华大学出版社. 2004.
[8] ITU-T Recommendation T.30. Procedures for Ducument Facsimile Transmission in the General Switched Telephone Network. 1996.
[9] ITU-T Recommendation T.4. Standardization of Group 3 Facsimile Terminals for Doucument Transmission. 1996.
[10]廖海红.通信系统中的CRC算法的研究和工程实现[D].北京:北京邮电大学. 2006.
[11]赵晓雷.无线通信系统中ARQ机制的研究与实现[D].西安:西安电子科技大学. 2009.
[12]汪晓燕,周吉,王斌. ARQ差错控制方式的分析设计及突发误码的影响[J].无线电通信技术. 1997,23(6):18-22.
[13]樊昌信,张甫栩,徐炳祥等.通信原理[M].北京:国防工业出版社. 2001.
[14] Ozugur T,Naghshineh M,Kermani P. Comparison of go-back-N and selective reject ARQ modes of HDLC over half-duplex and full-duplex IR links and the effects of window size and processor speed in utilization. The Ninth IEEE International Symposium on 1998:708-712.
[15] Hui H Y,Chung P S,Cham W K,et al. Comparison of standard G3 and ECM G3 transmission using computer simulation. IEEE Region 10 Conference on Computer and Communication Systems. 1990:758-762.
[16]周子耀.传真机原理与应用[M].北京:中国铁道出版社. 1992.
[17]代金良.高速传真通信系统中的调制解调器研究[D].大连:大连理工大学. 2006.
[18]马辉.高速传真技术研究与实现[D].大连:大连理工大学. 2006.
[19]米亮,罗新民,王泉. QAM解调器自动增益控制的设计[J].信息终端. 2003,12:63-65.
[20] ITU-T Recommendation V.21. 300 bits per second Duplex Modem Standardized for Use in the General Switched Telephone Network. 1984.
[21] ITU-T Recommendation V.27ter. 4800/2400 bits per second Modem Standardized for Use in the General Switched Telephone Network. 1984.
[22] ITU-T Recommendation V.17. A 2-Wire Modem for Facsimile Applications with Rates up to 14400bit/s. 1991.
[23] Analog Devices,Inc. ADSP-BF531/BF532/BF533 Data Sheet. Analog Devices,Inc. 2008.
[24]陈峰. Blackfin系列DSP原理与系统设计[M].北京:电子工业出版社. 2004.
[25]罗建,丁宗杰,闫冰.基于DSP的软件DDS及其在FSK调制中的应用[J].无线通信技术. 2009,1:59-62.
[26]石元君,雷菁,郑林华. PSK调制方式的快速软件实现[J].信息技术. 2003,27(2):83-85.
[27]杨英强.基于TMS320C5420的2FSK设计与实现[J].现代电子技. 2005,14:114-115.
[28]程燕飞.高速传真系统中关键技术研究[D].大连:大连理工大学. 2006.
[29]罗小巧,吴迪,董继承等.基于现代DSP技术的QAM调制解调器设计[J].电子测量技术. 2009,2:112-114.
[30]何兵,陈建.一种基于DSP的V.17 Soft Modem实现方案[J].通信技术. 2002,6:31-32.
[31]孙兴邦,刘亮,夏志忠.定点DSP C55X实现浮点相关运算[J].单片机与嵌入式系统应用, 2007,3:74-76
[32]周小丽,李俊峰.嵌入式系统编程中的代码优化[J].电脑开发与应用. 2004,2:60-62.
[33]明芳.嵌入式系统程序代码优化方法[J].计算机与数字工程,2006,34(10):189-192.
[2]陈楚华,史林. IP传真的分析与改进[J].计算机与信息技术. 2006,5:21-24.
[3]陈高长艳,郑喜凤,刘维亚. CMX869在高速低功耗调制解调器中的应用[J].仪表技术与传感器. 2006,1:38-40.
[4]杨小牛,搂才义,徐建良.软件无线电原理及应用[M].北京:电子工业出版社. 2001.
[5] ITU-T Recommendation T.0. Classification of Facsimile Terminals for Doucument Transmission over the Public Networks. 1996.
[6]周子耀.传真三类机软硬件原理与应用[M].北京:电子工业出版社. 1997.
[7] Andrew S. Tanenbaum潘爱民译.计算机网络[M].北京:清华大学出版社. 2004.
[8] ITU-T Recommendation T.30. Procedures for Ducument Facsimile Transmission in the General Switched Telephone Network. 1996.
[9] ITU-T Recommendation T.4. Standardization of Group 3 Facsimile Terminals for Doucument Transmission. 1996.
[10]廖海红.通信系统中的CRC算法的研究和工程实现[D].北京:北京邮电大学. 2006.
[11]赵晓雷.无线通信系统中ARQ机制的研究与实现[D].西安:西安电子科技大学. 2009.
[12]汪晓燕,周吉,王斌. ARQ差错控制方式的分析设计及突发误码的影响[J].无线电通信技术. 1997,23(6):18-22.
[13]樊昌信,张甫栩,徐炳祥等.通信原理[M].北京:国防工业出版社. 2001.
[14] Ozugur T,Naghshineh M,Kermani P. Comparison of go-back-N and selective reject ARQ modes of HDLC over half-duplex and full-duplex IR links and the effects of window size and processor speed in utilization. The Ninth IEEE International Symposium on 1998:708-712.
[15] Hui H Y,Chung P S,Cham W K,et al. Comparison of standard G3 and ECM G3 transmission using computer simulation. IEEE Region 10 Conference on Computer and Communication Systems. 1990:758-762.
[16]周子耀.传真机原理与应用[M].北京:中国铁道出版社. 1992.
[17]代金良.高速传真通信系统中的调制解调器研究[D].大连:大连理工大学. 2006.
[18]马辉.高速传真技术研究与实现[D].大连:大连理工大学. 2006.
[19]米亮,罗新民,王泉. QAM解调器自动增益控制的设计[J].信息终端. 2003,12:63-65.
[20] ITU-T Recommendation V.21. 300 bits per second Duplex Modem Standardized for Use in the General Switched Telephone Network. 1984.
[21] ITU-T Recommendation V.27ter. 4800/2400 bits per second Modem Standardized for Use in the General Switched Telephone Network. 1984.
[22] ITU-T Recommendation V.17. A 2-Wire Modem for Facsimile Applications with Rates up to 14400bit/s. 1991.
[23] Analog Devices,Inc. ADSP-BF531/BF532/BF533 Data Sheet. Analog Devices,Inc. 2008.
[24]陈峰. Blackfin系列DSP原理与系统设计[M].北京:电子工业出版社. 2004.
[25]罗建,丁宗杰,闫冰.基于DSP的软件DDS及其在FSK调制中的应用[J].无线通信技术. 2009,1:59-62.
[26]石元君,雷菁,郑林华. PSK调制方式的快速软件实现[J].信息技术. 2003,27(2):83-85.
[27]杨英强.基于TMS320C5420的2FSK设计与实现[J].现代电子技. 2005,14:114-115.
[28]程燕飞.高速传真系统中关键技术研究[D].大连:大连理工大学. 2006.
[29]罗小巧,吴迪,董继承等.基于现代DSP技术的QAM调制解调器设计[J].电子测量技术. 2009,2:112-114.
[30]何兵,陈建.一种基于DSP的V.17 Soft Modem实现方案[J].通信技术. 2002,6:31-32.
[31]孙兴邦,刘亮,夏志忠.定点DSP C55X实现浮点相关运算[J].单片机与嵌入式系统应用, 2007,3:74-76
[32]周小丽,李俊峰.嵌入式系统编程中的代码优化[J].电脑开发与应用. 2004,2:60-62.
[33]明芳.嵌入式系统程序代码优化方法[J].计算机与数字工程,2006,34(10):189-192.