Location:
Search - digital radio
Search list
Description: Digital cellular telecommunications system (Phase 2+)
Mobile radio interface layer 3 specification
(GSM 04.08 version 7.8.0 Release 1998)
Platform: |
Size: 2896896 |
Author: 石火龙 |
Hits:
Description: DIY微型数字调谐收音机 -DIY mini-mini Digital Tuning Radio DIY Radio Digital Tuning
Platform: |
Size: 36864 |
Author: andezeng |
Hits:
Description: HX108-2七段数码管超外差式收音机原理分析与组装过程-HX108-2 seven-segment digital tube superheterodyne radio principles of analysis and assembly process
Platform: |
Size: 707584 |
Author: 王王 |
Hits:
Description: fsk modulation Frequency shift keying (FSK) is the most
common form of digital modulation in the
high-frequency radio spectrum, and has
important applications in telephone circuits.
This article provides a general tutorial on FSK
in its many forms. Both modulation and
demodulation schemes will be discussed
Platform: |
Size: 1024 |
Author: knyl |
Hits:
Description: 这个程序可以计算给定点处的小区信号范围覆盖。-is program computes a map of visibility from a selected point on a topography. It has been written to help the search for radio relay best location. Because it considers only direct line of sight, it gives a good estimation for possible radio link for short distances only (less than 10 km), neglecting curvature of the Earth, Fresnel zone and atmospheric refraction on radio waves propagation. The program computes the relative elevation angle of the mask for each point (the angle is null or negative if the point is visible).
The function needs a digital elevation model Z and associated (X,Y) vectors or matrices of coordinates (same unit as Z), position of the point (X0,Y0), the antenna height H0 (for instance 4 m), and the hypothetic antenna height Ha on each topography points (for instance 3 m). When no output argument is given, the function plots a map of the results (color map of mask angles, and blank for visible points, see example screenshot).
The script is not fully optimize
Platform: |
Size: 434176 |
Author: ken |
Hits:
Description: 数字钟
实现定点报时
整点报仿电台报时
闹钟-Fixed-point digital clock to achieve the whole point timekeeping timekeeping clock radio reported that imitation and so on
Platform: |
Size: 562176 |
Author: lm |
Hits:
Description: Up until the end of the 20th century, there was a fairly clear division between the cellular industry and other telecommunication
industries which offered basic telephone, television, radio, computer and Internet services. Most mobile operators used
second generation (2G) digital wireless technologies to enable voice communications and limited data services, while most
wireline, cable and satellite systems provided the bulk of the other telecommunication services. In spite of its initial limitations,
cellular communications have been a tremendous success, surpassing fixed line connections worldwide in 2001, just 12
years after its market introduction. This has been especially evident in developing markets where, due to their lower
deployment costs and greater network flexibility, wireless technologies have become the primary means of communication
for millions of people, spurring the economic and social development of these markets.
Platform: |
Size: 1053696 |
Author: redami |
Hits:
Description: 多功能数字钟，有校时，仿广播报时，整点报时，闹铃等功能！-Multifunction digital clock, there are schools, the fake radio timekeeping, the whole point timekeeping, alarm and other functions!
Platform: |
Size: 1024 |
Author: puhaitao |
Hits:
Description: Learn about Ultra-wideband (UWB) transmission - the most talked about application in wireless communications. UWB wireless communication is a revolutionary technology for transmitting large amounts of digital data over a wide spectrum of frequency bands with very low power for a short distance. This exciting new text covers the fundamental aspects of UWB wireless communications systems for short-range communications. It also focuses on more advanced information about networks and applications. Chapters include: Radio Propagation and Large Scale Variations, Pulse Propagation and Channel Modelling, MIMO (Multiple Input, Multiple Output) RF Subsystems and Ad Hoc Networks.
Platform: |
Size: 5261312 |
Author: kinomira |
Hits:
Description: Bluetooth is a standard for short range,
low power, low cost wireless communication
that uses radio technology. Although originally envisioned as a cable-replacement technology by Ericsson (a major cell phone manufacturer) in 1994, embedded Bluetooth
capability is becoming widespread in
numerous types of devices. They include intelligent devices (PDAs, cell phones, PCs), data peripherals (mice, keyboards, joysticks, cameras, digital pens, printers, LAN access points), audio peripherals (headsets, speakers,
stereo receivers), and embedded applications
(automobile power locks, grocery store updates, industrial systems,MIDI musical instruments). Ericsson joined forces
Platform: |
Size: 334848 |
Author: HArry |
Hits:
Description: 用硬件描述语言实现数字钟的设计，实现正常计时，报整点时数，电台整点报时，12小时制与24小时制转换等功能。其中有代码和仿真结果-Using hardware description languages digital clock design, implement the normal timing, the whole point, the number of newspaper, radio and the whole point timekeeping, 12-hour and 24-hour conversion functions. Including code and simulation results
Platform: |
Size: 207872 |
Author: 张军 |
Hits:
Description: 自动识别系统电台的卞要功能是在接收状态将接收到的射频信号解调成高斯最小频移键控(GMSI})比特流以供信号处理板使用 而在发射状态则将来自处理板的9.6 kbps的GMSI}比特流调制成适合发射的射频信号并发射。木电台使用半双工方式工作，共用一副大线，其中发射通路只有一个通道，但可通过微处理器改变调制芯片LMX1501的内部设置数以产生两个频率，然后再经过卜变频得到中心频率分别为162.025 MHz和161.975 MHz的发射信号 木电台的接收则分为二路，其解调芯片都是用TA31136来实现的，其中两路用来接收中心频率分别为162.025 MHz和161.975 MHz信号，另一路用来接收数字呼n}}信号，中心频率为156.025 MHz。二个通路的结构、工作原理和使用的器件都基木相同。
-Bian automatic identification system stations to function in the receiving state will receive the RF signal demodulation into a Gaussian Minimum Shift Keying (GMSI)) bit stream for the signal processing board used while the state will launch from the processing board The GMSI) of 9.6 kbps bit stream into a modulated RF signals suitable for launch and launch. Wood work station using the half-duplex mode, sharing one big line, which launched only one channel path, but can be modulated by changing the microprocessor chip LMX1501 number of internal settings to produce two frequencies, and then get through the BU center frequency of inverter for 162.025 MHz and 161.975 MHz transmit signal wooden radio receiver is split Road, its demodulator chips are used to achieve TA31136, in which two-way center frequencies were used to receive 162.025 MHz and 161.975 MHz signal, the other all the way to receive digital calls n)) signal, the center frequency of 156.025 MHz. 2 channel structure, working
Platform: |
Size: 12288 |
Author: 王军 |
Hits:
Description: DVBViewer allows you to experience Digital TV on your PC. With a proper DVB card you can enter the world of digital entertainment and experience high quality, incredibly sharp TV pictures and near CD quality radio!
Platform: |
Size: 1024 |
Author: hoole |
Hits:
Description: 本文应用软件无线电思想对全数字接收机中的几个关键技术进行了研究，对其中的基本结构及基本模块进行了建模仿真。
-In this paper, thinking of all-digital software radio receiver in several key technologies were studied, of which the basic structure and the basic module of modeling and simulation.
Platform: |
Size: 4279296 |
Author: 河海小僧 |
Hits:
Description: 几个广电标准,搞数字电视研发的一定用的上,正好一起打包了.
GYT231-2008数字电视广播电子节目指南规范
GYZ174-2001数字电视广播业务信息规范
GYZ175-2001数字电视广播条件接收系统规范
GYZ203-2004数字电视广播电子节目指南规范
GYT106-1999有线电视广播系统技术规范-Several radio and television standards, engage in research and development of certain digital TV uses the GYT231-2008 digital television electronic program guide specification GYZ174-2001 digital television broadcasting service information specification GYZ175-2001 digital television broadcasting conditional access system, digital television broadcasting standard GYZ203-2004 E Program Guide Specification
Platform: |
Size: 4766720 |
Author: dhj_chip |
Hits:
Description: 大功率射频数字控制显示部分程序，（液晶显示，串口通讯，按键程序，存储程序，模数转换程序等）-High-power radio frequency digital control display part of the program, (liquid crystal display, serial communications, key procedures, storage procedures, analog-digital conversion process, etc.)
Platform: |
Size: 182272 |
Author: 管小亮 |
Hits:
Description: 基于直接数字频率合成(DDS) 原理，利用AT89C52 单片机作为控制器件，采用AD9850
型DDS 器件设计一个信号发生器。给出了信号发生器的硬件设计和软件设计参数，该系统可输出正弦
波、方波，且频带较宽、频率稳定度高，波形良好。该信号发生器具有更强的市场竞争力，在跳频技术、
无线电通信技术方面具有比较广阔的发展前景。-Based on Direct Digital Synthesis (DDS) theory, using AT89C52 microcontroller as a control device, the AD9850 DDS device type to design a signal generator. Gives the signal generator hardware design and software design parameters, the system can output sine wave, square wave, and wide bandwidth, high frequency and stability, wave good. The signal generator has a stronger market competitiveness, in the frequency hopping, radio communication technology has relatively broad prospects for development.
Platform: |
Size: 959488 |
Author: 姚木 |
Hits:
Description: 本模块采用了Silicon Labs的Si4432作为无线收发芯片，是一块完整的、体积小巧的、低功耗无线收发模块。模块集成了所有射频相关功能和器件，只向用户提供简单的几个数字I/O口，用户不需要了解无线电的相关知识，就可以使用本模块轻易的开发出性能稳定可靠的无线相关产品。和MC13213单片机接口，使用IO口模拟SPI-This module uses the Si4432 Silicon Labs as a wireless transceiver chip is a complete, compact, low-power wireless transceiver module. RF module integrates all relevant functions and devices, provide users with only a few simple digital I/O port, users do not need knowledge about radio, you can easily use the module to develop stable and reliable wireless related products. And the MC13213 microcontroller interface, using IO port simulation SPI
Platform: |
Size: 876544 |
Author: 孙谦 |
Hits:
Description: 车辆监控、遥控、遥测、小型无线网络、无线抄表、门禁系统、小区传呼、工业数据采集系统、无线标签、身份识别、非接触RF智能卡、小型无线数据终端、安全防火系统、无线遥控系统、生物信号采集、水文气象监控、机器人控制、无线232数据通信、无线485/422数据通信、数字音频、数字图像传输等。和51单片机调试-Vehicle monitoring, remote control, telemetry, small wireless network, wireless meter reading, access control systems, residential paging, industrial data acquisition system, radio labels, identity, RF contactless smart card, a small wireless data terminals, security, fire systems, wireless remote control system, of biological signals acquisition, hydrological and meteorological monitoring, robot control, wireless 232 data communications, wireless 485/422 data communications, digital audio, digital image transmitted so. And 51 single-chip debugging
Platform: |
Size: 194560 |
Author: 孙谦 |
Hits:
Description: The Tri-Band Receiver ("TBR" here after) described in this Web site is the result of a home building project conducted during the second half of 2003.
The general idea behind this project was to build a receiver capable of copying the digital mode amateur radio traffic.
I downloaded so much from the Internet during the past years, that it is appropriate that I should do something in return now, hence this Web site. The work on the TBR is not entirely finished yet, so this Web site will be updated has further enhancements will become available.-The Tri-Band Receiver ("TBR" here after) described in this Web site is the result of a home building project conducted during the second half of 2003.
The general idea behind this project was to build a receiver capable of copying the digital mode amateur radio traffic.
I downloaded so much from the Internet during the past years, that it is appropriate that I should do something in return now, hence this Web site. The work on the TBR is not entirely finished yet, so this Web site will be updated has further enhancements will become available.
Platform: |
Size: 12636160 |
Author: Cemal |
Hits: