High frequency pulsed sounds might be used for echolocation, and low frequency time continuous signals related with communication and emotive state expression.
高频脉冲信号可能与回声定位有关，而低频连续信号可能与通信和情感表达有关。
A variable frequency inverter with a RS-485bus communication interface is designed. It has the advantages of simple hardware interface and high reliability of communication.
设计了一种带有RS- 485接口的交流变频控制器，它硬件接口简单，通讯可靠性高。
In addition, there will be frequency selective fading in the future broadband MIMO wireless communication systems, and the traditional high-performance equalizer will become extremely complicated.
另外在未来宽带MIMO无线通信系统中，通常面临频率选择性衰落信道，传统高性能均衡器就会变得异常复杂。
Whatever it is radar, eccm equipment, communication equipment or instrument, frequency source with high stability is needed to guarantee the quality of carrier signal.
无论是雷达、电子对抗，还是通信、仪器设备等都需要高稳定度的频率源，以保证载波信号的质量。
The high frequency electronic circuit is an important basic course in the communication and electronic speciality, the practice teaching is an important aspect.
高频电子线路是通信和电子专业的重要专业基础课，实践教学是其中的一个重要方面。
The frequency synthesizer is a kind of discrete frequency singal generator with high stability, and it is widely used in communication, radar, apparatus and navigation system.
频率合成器是一种频率稳定度较高的离散间隔型频率信号发生器，广泛应用在通信、雷达、仪器仪表及导航系统中。
In the communication of multiplex system, the DS signal exists Doppler frequency shift for the high dynamic situation of aerocraft.
在复合系统通信中，飞行器的高动态使扩频信号存在多普勒频移。
The next generation mobile communication 4g called will support very high data transmission rate. It's necessary to introduce technology with high frequency utilization in limited frequency spectrum.
未来的新一代移动通信系统4g需要提供极高的数据速率，在有限的频谱下提供尽可能高的传输速率，这就需要采用高频谱利用率技术。
High data transmission rates and high mobility give rise to time - and frequency - selectivity in wireless communication channels.
高数据传输速率以及终端的高速移动，导致无线通信信道具有时间选择性与频率选择性两个特征。
It has important significance in the design of high purity spectrum agile signal synthesizer and frequency synthesizer in military digital communication equipment.
这对于高纯频率捷变合成信号源和军用数字通信设备中频率合成器的设计具有重要意义。
Low cost high-frequency device, high-frequency amplifying method, radio communication device and mobile phone.
低成本高频装置，高频放大方法，无线通信装置和移动电话。
Because high-speed data take up wide bandwidth, looking for one which have high efficiency modulation scheme and suitable for frequency hopping communication system is needed.
由于高速数据占用更宽的带宽，所以在调制制式上应该寻找一种适合于跳频通信特点的具有高频谱效率的调制方案。
A single carrier modulation scheme suitable for use in high frequency communication systems is provided that achieves improved residual frequency error and phase noise estimation.
提供了一种实现改进残留频率误差和相位噪声估算的、适合于在高频通信系统中使用的单载波调制方案。
The master control chip uses AT89C51, the communication mode adopts DTMF signal with strong anti-interference and high reliability, and simplex frequency modulation.
主控芯片采用AT89C51单片机，通信方式采用抗干扰能力强、可靠性高的DTMF信号和单工调频的无线通信方式。
Orthogonal frequency division multiplex (OFDM) is suitable for Broadband-satellite mobile communication system with the advantage of robustness to muti-path and high bandwidth efficiency.
正交频分复用(OFDM)技术具有抗多径衰落，频谱利用率高等优点，适合于在宽带卫星通信这种无线环境下进行高速传输。
A novel adaptive line enhancer (ALE) with high frequency resolution was presented, which suitable for underwater acoustic communication with MFSK or frequency hopping (FH) modulation.
根据水声mfsk或跳频通信中频率估计特点，提出了一种基于自适应线谱增强器(ale)理论的实用高分辨频率估计新方法。
In high frequency communication, extremely low SNR communication is an expedient means.
在短波通信中，极低信噪比条件通信是一种应急通信手段。
Their gear includes satellite communication systems, high-frequency radio, long-range optical equipment.
他们的装备包括卫星通信系统，高频电台，远距离。
In the field of wireless correspondence, high performance of frequency source is the core part of communication facility, radar, electronic reconnaissance and resistance equipment.
在无线通信领域中高性能频率源是通信设备、雷达、电子侦察和对抗设备的核心部件。
Military Intelligence Battalion's gear includes satellite communication systems, high-frequency radio, long-range optical equipment.
美军陆军军事情报营的装备包括卫星通信系统、高频电台、远距离光学仪器。
For example, both the EAS(Electronic Article Surveillance) system and the RFID(Radio Frequency Identification) system need high effective the short-range radio communication antenna.
例如，许多电子安检设备，如EAS（商品防窃检测）、RFID（射频识别）读写设备等，都要应用高效的近场通信天线。
The analysis of the high frequency impedance in a distribution network is an important aspect of power-line communication.
配电网高频阻抗特性分析是当前电力载波研究的一个重要内容。
Small size, low weigh and high working frequency are the characteristics of multilayer ceramic microwave filter, and it is now being employed in communication and electric products application.
多层陶瓷微波滤波器是一种基于低温陶瓷共烧技术的新型滤波器，具有小型化、轻便化和高频化特点，在通信、汽车、数字化家电等产品中已得到广泛应用。
In order to get high data rate communication, we must enhance frequency efficiency because mat frequency resource is limited.
频谱资源是有限的，为了实现高速通信必须提高频谱效率。
Its business covers network communication, computer system integration, surface mounting technology, printed circuit boards, electricity meters, micro motors, and high frequency devices.
其业务范围包括网络通信，计算机系统集成，表面贴装技术，印刷电路板，电表，微型电机，和高频设备。
It has high frequency efficiency and its implement is simple. Therefore, it has become the topic in high-speed mass optical fiber communication system.
它具有结构简单，频谱利用率高的优点，因此成为高速大容量光纤通信系统中的研究热点。
With the change of climate and high frequency of disastrous weather, weather news is paid more and more attention and being an important question that is worth thinking in the field of communication.
随着气候的变化和灾害性天气的频发，气象新闻这一新闻品种正在受到越来越多的关注。
PA is very important in the wireless communication system, it amplify high frequency signal to the desired power which is sent through the antenna.
射频功率放大器模块是无线通信收发器中的重要模块，它的作用是放大高频信号至所需的功率，并送至天线辐射出去。
Orthogonal frequency-division multiplexing (OFDM) is an attractive transmission technique for high-bit-rate communication systems.
中文含义为正交频分复用，它是一种多载波调制技术。
Orthogonal frequency-division multiplexing (OFDM) is an attractive transmission technique for high-bit-rate communication systems.
中文含义为正交频分复用，它是一种多载波调制技术。
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