设计了一种多频信号采集系统。
用这种方法设计的多频信号接收器具有工作速度低和运算效率高的特点。
The multifrequency receiver designed with this method has the property of lower rate of processing and high calculation efficiency.
方法：根据数字频率合成理论，基于FPGA实现了多频信号源的核心部分。
Method Based on the digital frequency synthesis theory and FPGA, the main part of a multi-frequency signal source is accomplished.
解码部分采用FFT算法从频域进行检测，该方法也可用于其它多频信号的检测。
FFT method is used here to decode the multi - frequency Register signals, which is also suitable for other multi - frequency signals' detection.
本文就计算机多频信号采集设备的设计思路、实施方案、技术难点及其解决措施进行了论述。
This paper offers the way of the design thoughts, technological problems and the solution to the collection.
多频激电相对相位谱法充分发挥了伪随机多频信号作为电法勘探场源的优点，可在找水，找矿等勘探中发挥重要作用。
PRMF relative phase spectrum IP show the advantage of PRMF signal as source of electrical exploration, can play important in groundwater exploration, mineral exploration, and so on.
利用伪随机多频信号作为场源的多频相对相位谱观测法拥有相对相位观测法的优点，同时为异常源的区分提供丰富的信息。
PRMF relative phase spectrum IP method with PRMF signal as excitation has the same advantage of relative phase IP method, and offer rich information for the discrimination of anomaly source.
该模型利用事件通告机制来传送双音多频信号，通过SUBSCRIBE和NOTIFY两个消息来实现交换机对SIP终端的完全控制。
This model offers SIP Specific Event Notification to transmit DTMF, and USES SUBSCRIBE and NOTIFY to realize the control to IP phone.
该系统用MI-TEL公司的DTMF收发器MT8880芯片作为电话双音多频信号的解码核心，用AT89C5 1单片机作主控器，电路简单灵活。
The system uses MT8880 (made by MITEL company) as the decoding chip of DTMF telephone and chip AT89C51 as the microcontroller, so, the circuit is simple and adaptive.
非常多的设备支持组合视频信号。
Many different kinds of equipment understand composite video signals.
为了给验证算法提供现实的BPSK调制的直接序列扩频信号，本文详细介绍了一种多参数可调的扩频信号源的设计方案。
In order to supply the actual BPSK DS-SS signal to verify the algorithms, this dissertation present a design method of spread spectrum signal generator with adjustable muti-parameter in detail.
本文提出一种时分多址跳频信号的捕获方法。
An acquisition method of frequency hopping signal in a TDMA system is presented in this paper.
在存在着各种干扰和多经衰落的无线环境中，扩频信号的宽带特性使得系统的性能得到明显的改善。
In radio environment of existing variable disturbtion and muti-way declining , expand frequence signal's broadband characteristics can improve system performance obviously.
通过对信号进行基于瞬时自相关的瞬时频率提取的方法对中频信号进行分析、识别，然后可以在FP - GA内部构造一个多通道匹配滤波器对信号进行匹配。
The article analyses the signal through the method of gaining instant frequency on the base of instant correlation, then we can make up a multicenter matching filter in the FPGA.
高频信号在多导体电力线上传输时会存在严重的线间串扰，造成接受端信号能量的损失和信号的混乱。
The transmission of high frequency signals in multi-conductor electrical cable may introduce serious line-to-line crosstalk, which may result in the loss of signal energy on receivers.
定频干扰信号的自相关特性严重影响了基于多跳自相关方法的跳频信号检测性能。
Autocorrelation of frequency-fixed signals always greatly interferes the performance of the detection of frequency-hopping signals based on multi-hop autocorrelation theory.
小波变换是信号的时间-频率分析方法，它具有多辨分析的特点，它能有效地检测和识别跳频信号，在跳频通信中有极其重要的作用。
To analyze and detect the feature of frequency hopping signal exactly is a crucial prerequisite to carrying out disturbance to follow the track of signal.
在传输网络中，音频适配器采用双音多频芯片MT8880实现数据格式的转换功能，对讲机则完成对转换后的音频信号收发功能；
In the transmission network, the audio adapter adopts MT8880 to transform the data format and the wireless interphone is to transmit and receive the audio signal.
在传输网络中，音频适配器采用双音多频芯片MT8880实现数据格式的转换功能，对讲机则完成对转换后的音频信号收发功能；
In the transmission network, the audio adapter adopts MT8880 to transform the data format and the wireless interphone is to transmit and receive the audio signal.
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