| 1. | Voice communication system
话音通信系统 |
| 2. | The paper studies the digital data and voice communication system based on the distributed fire control network
本文研究了基于分布式火控网络的数字通信和语音通信。 |
| 3. | Fire detection and alarm systems for buildings - code of practice for the design , installation , commissioning and maintenance of emergency voice communication systems
建筑物火灾探测和警报系统.应急语音通讯系统的设计安装交付使用和维护的实用规则 |
| 4. | 3 . finish demonstrating , designing and realizing an underwater voice communication system . code , modulation , equalization and demodulation are realized in real - time
对水下语音通信系统进行方案设计论证，完成编码调制、均衡和解调在硬件系统上的实时实现。 |
| 5. | Upon the request from some institutions that have the practical needs for uwa applications , the research is conducted to achieve the objective of developing a digital underwater acoustic voice communication system with longer working distance
本研究是根据很重要的应用单位对更远作用距离语音通信机的需要而选题的。 |
| 6. | The work comprises of : traffic control detection system ; cctv surveillance system ; radio communication system ; voice communication system ; speed enforcement system ; and associated traffic field equipment such as fully variable message signs
此系统包括交通控制及侦察系统，闭路电视监察系统，无线电通话系统，语音通讯系统，超速检控摄影系统及相关的实地交通设备，提供可更新交通讯息的道路指示牌。 |
| 7. | This thesis makes a research on the design and implementation of an underwater digital voice communications system , which can realize the high speed transmission of digital voice streams in real time and implement voice communications with a good quality
本论文对水下数字语音通信系统的设计和实现进行了研究，开发了一套水下数字语音通信系统，该系统实时的实现水下数字语音的高速传输，并能完成高质量的语音通信。 |
| 8. | The performance of the system has been investigated both in the laboratory ' s pool and on sea trials in real ocean environments at xiamen bay coast . the results have indicated that the new generation of underwater acoustic voice communication system has the capability to overcome the severe multipath interference and has longer working range
通过实验室水池的实验和厦门港浅海域的现场测试，证实了本研究实现的新一代水声数字语音通信机确实有更远的作用距离并且有抗强多途径干扰的能力，达到预期的研究目标。 |
| 9. | This thesis mainly deals with the hardware design of whole system , on the basis of summarization of underwater voice communication systems , this thesis analyzes some key technology used in underwater digital voice communications , demonstrates the feasibility of the whole system , and then provides a scheme to realize the whole system
本论文以整个系统的硬件设计为主要研究对象，在综述水下语音通信系统的基础上，首先分析了水下数字语音通信中的几项关键技术，论证其可行性，并由此提出了整个系统的实现方案。 |
| 10. | It has been proven that the spread spectrum technologies have good capabilities of overcoming isi in electromagnetic wireless channel . the feasibilities of their applications to underwater acoustic channel have been analyzed , the frequency hopping technology is chosen . instead of using time - frequency diversity , convolutional coding and viterbi decoding are employed to combat signal fading , consequently the bit - rate and bit - error - rate performance of the underwater acoustic voice communication system can be balanced and controlled
由于扩频技术在抗码间干扰方面具有优良的特性，因此在分析了各种扩频技术于本研究应用的可行性之后，确定了跳频技术作为具体实现方案；在克服幅度衰落方面，选用卷积编码和维特比译码方法来替代原有的分集技术以综合调节系统的通信速率与误码性能，达到差错可控的目的。 |
