DTMF信号编、解码器设计及仿真

文档编号:TX413  文档字数:7853,页数:33

DTMF信号编、解码器设计及仿真
摘  要

 DTMF（dual tone multiple frequency）编码是用两个单频音的合成音来表示一个数字或符号。 DTMF解码是用特定的方法或算法识别两个单频音的合成音，提取其包含的数字或符号信息。DTMF信号编码、解码已经成为一种非常成熟的技术，依循的技术规范是ITU Q.23。相对于脉冲拨号方式，DTMF 方式的优点是拨号速率高，通话期间也适用，不会引入明显的干扰。DTMF 编码技术主要包括单音发生和双音合成两部分；DTMF解码技术主要包括双音检测、收发同步和单音分离判别三部分。理解和解决这些技术问题对研发和设计一般通信设备和系统具有普遍意义。
 本文在分析讨论原有的DTMF编码、解码方法的基础上分别提出了一种新的DTMF 编码算法和一种新的DTMF 解码算法。在Ti的TMS320C64XX DSP 上仿真结果表明，新的DTMF编码、解码算法简单易于实现，编码效率高，运行速度快，解码误差率低，是很有实用价值的算法。
                                                                                      
关键词：DTMF信号编码 DTMF信号解码  TMS320C64XX DSP应用

DTMF signal encoder and decoder design and simulation
ABSTRACT

DTMF (dual tone multiple frequency) encoding is to use the synthesis of two single-tone sounds to indicate a number or symbol. DTMF decoding is to use a particular method or algorithm to recognize the synthesis of two single-tone sound, and extract information which contained within the numbers, or symbols. DTMF signal encoding and decoding has become a very mature technology, that follows the technical specification ITU Q.23. Relative to the pulse dialing, DTMF dialing method has the advantage of high rate, and applies during a call without introducing significant interference. DTMF tone encoding techniques include the occurrence and synthesis of two-tone ; DTMF decoding techniques include dual-tone detection, tone transceiver separation of synchronization and identification .Understanding  and solving these technical problems has universal significance for designing in general communications equipment and systems.
On the analyzing result of some of the existing DTMF signal encoding, we has advanced a new DTMF signal encoding and decoding algorithm respectively in the paper. The result of simulation analysis on Ti TMS320C64XX DSP shows that the new DTMF signal encoding and decoding algorithm are simple and easy to realize, possess high coding efficiency, high rate to run,and decoding error rate very low , have practical application value.

Keywords: DTMF Signal Encoding DTMF Signal Decoding TMS320C64XX DSP Application

目  录

摘  要 I
ABSTRACT II
1 引言 1
2 双音多频信号技术规范 2
3 双音多频信号发生算法分析论证 3
3.1 双音多频信号发生现有算法分析 3
3.2 改进的双音多频信号发生编码算法 5
4 双音多频信号解码算法设计论证 7
4.1 双音多频信号接收解码现有算法分析 7
4.2 一种新的双音多频信号接收解码算法 8
5 C64xx DSP 性能特点 11
5.1 C64xx DSP硬件结构 11
5.2 C64xx DSP指令系统 12
5.3 DSP集成开发工具CCS 15
6 算法实现DSP源程序注解 17
7 算法仿真结果与讨论 23
7.1 双音多频信号发生编码算法仿真结果 23
7.2 双音多频信号接收解码算法仿真结果 23
7.3 算法仿真结果讨论 23
8 结论 24
参考文献 25
附录：DTMF 编码、解码数据表 26
谢辞 29

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