查询词典 digital channel

Analog channel ; digital coding ; fault detection

模拟信道；数字编码；故障检测

Firstly it describes the development ,basic principle and application and propagation characteristic of mobile channel , then investigates the system structure of DAB transmitter and receiver separately and the key technology of realization of the digital audio broadcast system.And then discusses the system component of FFT －the demodulation module of OFDM .The 409- points FFT module employs a radix-4 decimation-in-frequency algorithm, includes arithmetic element , read and write address element ,twiddle factor element and control element , is realized by FPGA. In the end , the result is verified in the matlab .

首先概述了OFDM的发展、基本原理和应用以及移动信道的传播特性，接着分别研究了数字音频广播接收机和发射机的系统结构，以及数字音频广播系统实现的关键技术，然后详细论述了OFDM解调模块FFT的系统结构，主要研究了4096点FFT采用基－4按频率抽取实现的算法，整个FFT模块包括了运算单元、读写地址单元、旋转因子单元以及控制单元，并且在FPGA中进行了硬件实现，并在matlab环境下对结果进行了验证。

CPLD is the core of the sampling audio board, which converts the analog audio signal in every channel to digital audio signal, then stores the audio data in the data buffer.

音频采集板以CPLD为核心，主要将各路模拟音频信号转换成数字音频信号，然后存入数据缓冲区。

Equipped with AT89C51,the temperature sensor and the modulus convertor and coordinated by soft and hard wares,the system can fufil the instantaneous gathering of multichannel temperature signal,then,by meaus of asynchronous string communication,send the digital signal to PC which can separately display the instantaneous value and the average value of each channel temperature in bar diagram and weblike form,and print the temperature curve graph through data scale transferring,analyzing,and collating.

该系统运用单片机AT89C51、温度传感器保温器及模数转换器，通过软硬件的配合，实现了多路温度信号的实时采集，用异步串行通信发送数字信号到PC机，PC机经过数据的标度转换、分析、整理，分别用棒状图和网状表格显示各路温度瞬时值和平均值，打印出静态降温调温曲线图。

In this paper, digital baseband transmission system to a simple description, Channel Signal Processor of which are part of a focused on.

本文首先对数字基带传输系统进行了简单的描述，并对其中关于信道信号形成器的部分进行了着重讲解。

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在公司的成功经营过程中，我们与包括德国拜罗伊特国际艺术节组委会、蒙古国蒙中友好协会、蒙古国国家旅游促进会、蒙古国GRANDSKY国际旅行社、中国旅游卫视、中国自驾网、中国数字电视车迷频道等在内的各官方及民间机构、公司、团体等建立了良好的战略合作伙伴关系，并成功运做了包括"中蒙环保大型自驾之旅"、"中蒙房地产商务考察之旅"等国际商务文化交流活动，在业界树立了相对的知名度及良好的信誉度。

I will soon take delivery of a new Uniden/Bearcat BX-785D 1,100-channel digital scanner, along with a very wideband discone antenna.

我不久将要取得一台新的UNIDEN/BEARCAT的BX-785D，有1100个频道的数字扫描接收机，配上一个有很宽的带宽的DISCONE天线。

Because it is more superior than that of the binary scale FSK and OOK that the binary scale moves the looks key and accuses of the system in resisting noise performance and channel communication frequency band utilization ratio etc., widely used in digital communication.

二进制移相键控方式是受键控的载波相位按基带脉冲而改变的一种数字调制方式。由于二进制移相键控系统在抗噪声性能及信道通信频带利用率等方面比二进制FSK及OOK的优越，因而被广泛应用于数字通信中。

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With up to 1,800 dpi resolution, 10 bits per color channel, automatic exposure control and color balance, clear, accurate digital images are assured.

高达1800 dpi的分辨率，每一频道各为10bits ，自动曝光控制和色彩平衡，清晰，准确的数字图像是有保证的。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。