Source: Huaqing vision embedded School, source: http://www.embedu.org/Column/Column698.htm
Author: Instructor Cheng,Hua Qing vision embedded college lecturer.
I. Data Communication Methods
The basic data communication methods can be divided into parallel communication and serial communication.
(1) Parallel Communication: multiple data lines are used to send data simultaneously. It features high transmission speed and is suitable for short-distance communication.
(2) Serial Communication: one pi
wireless mode video stream to the receiving end, the output image, to Whdi as the representative. At present, only Whdi technology can be realized in the industry.
Transfer without delay
Because Whdi technology provides enough wireless bandwidth, without compressing the way to transmit, save the video in the compression and decompression process of time spent, so can ensure that the transmission of film and television frequency is completely without delay.
Resolution up to 1080P
Whdi techno
Localmessagesender object in another application. The transmitter always sends the first message, but the receiver may respond and implement bidirectional communication. You can also create both the transmitter and receiver objects in two applications so that one of them can send the first message.
When you create a sink, you must give it either a unique name in the global scope or a unique name within th
layer has different refractive index (R1), and its value is usually less than 1% of the fiber core. If the light
The angle of incidence less than the critical angle shoots into the core and cladding interface, and the light will be absorbed through the cladding into the coat.
The use of optical fiber as a transmission media must be equipped with photoelectric conversion equipment, namely, optical transmitter and optical receiver. The optical
Http://zhidao.baidu.com/link?url=nkdS5wMr2QzSxzSgUebp4r4HSlKuBn2Y3IqMu7bUi9NBABPtwvN7-Fd2rrfdn8TDSqnfVGNTvWvsHOQMzpoLq_
What is the effective omni-direction radiation power?
In fact, the directional transmitting antenna is often used, so that the transmitter power is concentrated in a particular direction and the energy is greatly enhanced in this particular direction.
assuming that the energy in a particular direction is greater than the non-directi
Overview:
Media independent interface (media-independent interface), or media-independent interface, is the Ethernet industry standard defined by the IEEE-802.3. It includes a data interface and a management interface between MAC and PHY.
Data interfaces include two independent channels used for the transmitter and receiver respectively. Each channel has its own data, clock, and control signal. The MII data interface requires a total of 16 signals.
Th
= 1 due to the pull-up resistance.
The txo end of this interface circuit is tested by adding a 1 kHz TTL square wave. When the 120 Ω end resistance is not added, both the 485-a and 485-b ports of the interface chip have a voltage variation process of about 50 μs, as shown in figure 2. The rising edge of the RO waveform at the receiving end has a significant delay of about 30 ~ 40 μs (compared with the DI of the data sending end), resulting in a large transmission error. When the 120 Ω resistan
Int SetReceiveMode (RTPTransmitter: ReceiveMode m)
----- Set the receiving mode to m. The value of m can be RTPTransmitter: AcceptAll, RTPTransmitter: AcceptSome, RTPTransmitter: IgnoreSome. Note! If the mode changes, all information about the received or ignored addresses will be lost.
Int AddToIgnoreList (const RTPAddress addr)
----- Add the address addr to the ignore address list.
Int DeleteFromIgnoreList (const RTPAddress addr)
----- Remove the address addr from the ignored address list.
V
By Sreekrishnan Venkateswaran
Linux Bluetooth
Bluetooth is a short-range wireless technology used to replace cables. It supports 723 kbps (asymmetric) and 432 kbps (symmetric) speeds to transmit data and voice. The transmission range of a Bluetooth device is about 10 meters (30 feet ).
BlueZ is the official Linux Bluetooth Stack. It consists of the Host Control Interface (HCI) layer, Bluetooth Protocol core, Logical Link Control and Adaptation Protocol (L2CAP) SCO audio layer, other Bluetooth
In communication, the standard serial port must have a lot of handshake signal and state information in order to keep the operation safe and reliable. This is because each computer in the communication has a different CPU speed (which causes "wrong frames") and the transmitter sends data faster than the receiver receives (this can cause "overshoot"). To solve this problem, we use a simple handshake signal, that is, the
the environment with multi-path effects: beam forming and multi-channel space diversity. The following sections describe their functions and benefits.
Transmission Beam Forming Technology
Beam is a technology used when multiple transmitting and receiving antennas exist in an open or less obstacle environment. When multiple transmitting antennas exist, each sent RF signal produces a different phase during transmission due to different transmission paths. These differences will affect the overall
UART (Universal asynchronous transmitter ER/transmitter)General asynchronous transceiver UART is a chip used to control computers and serial devices. One thing to note is that it provides an interface to the RS-232C data terminal device so that the computer can communicate with the modem or other serial devices that use the RS-232C interface. As part of the interface, UART also provides the following func
placement sectorplacer (where all particles are from a specified center point, the Radius Range and angle range of the fan surface are born), and The multipart placement multisegmentplacer (the User specifies a series of points where particles are generated along the line segments defined by these points ).
Transmitter (osgparticle: Shooter)-specifies the initial speed of the particle. The radialshooter class allows you to specify a speed range (mete
this value is not 0 o'clock, the emitter will use this value as the number of initialized particles emitted.Quality level SpawnDisplays the quality setting scale, which determines the scale at which the system's video settings are low, to reduce system consumption.Detail ModeThe transmitter's display accuracy, the transmitter will not work when the system's display accuracy is below this setting.Disabled lods Keep Emitter AliveThe emitter remains in
According to reports from foreign media, Microsoft recently unveiled more detailed features of Windows 8.1 at the TechEd conference in New Orleans, which includes support for NFC printing and Wi-Fi hotspot features. For enterprise users, the addition of these two features will undoubtedly make Windows 8.1 more practical.
Microsoft has said in the Windows business and springboard blogs that Windows 8.1 will allow the PC to connect to the printer in an NFC way, completing the print task. Of cours
============ Problem Description ============I am a novice Android, recently encountered a problem: how to put an Android device's screen in real-time sharing to multiple devices.I'm not sure what this technology is called, screen sharing, screen syncing, screen broadcasting, remote monitoring? Does that mean a thing?and the principle and solution of screen sharing on Android is the same as on a PC?Ask the great God to explain the specific solution! Is the trouble to say to achieve this function
, support built-in camera flash, support dynamic desktop;(5) May 2010, support FLASH;APP2SD function;(6) December 2010, support VP8 and WEBM video formats, support front camera, Sip/voip and NFC, one-click Text Selection, copy and paste;(7) February 2011, N-app purchases function;(8) May 2011, mobile phone system and tablet system merged, support USB input device, support Xbox 360 wireless handle;(9) July 2011, introduced the application display zoom function;(10) October 2011, function; Greatly
==================== Problem Description ====================I am a novice Android, recently encountered a problem: how to put an Android device's screen in real-time sharing to multiple devices.I'm not sure what this technology is called, screen sharing, screen syncing, screen broadcasting, remote monitoring? Does that mean a thing?and the principle and solution of screen sharing on Android is the same as on a PC?Ask the great God to explain the specific solution! Is the trouble to say to achie
June 15 News, early this morning Microsoft Sync push Win10 Mobile and Win10 pc Preview version 10586.420, which also belongs to Windows10 TH2 Stable branch, this version does not bring new features, mainly bug fixes and system stability improvement. Now Microsoft has released 10586.420 of the updated content.Here are the cumulative updates, including the WIN10 desktop and mobile version:? Improve reliability such as IE11, Microsoft Edge Browser, Cortana, audio playback, Groove music audio playba
protection. The integrated hardware-wide security system is another feature of a83t. A83T supports digital rights protection schemes, including high-level widevinelevel1, for Miracast hdcp2.x, support secureboot/secure Storage function to ensure the security of system and data. The 28nm's advanced technology, ultra-energy-efficient CORTEX-A7 architecture, the most balanced performance power POWEVRNBSP;SERIESNBSP;5NBSP;GPU, and continuous optimization
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