0 foreword
CMI yard is abbreviation of the coded mark inversion, it is a kind of format of code of daily circuit who applies PCM biquadratic cluster and fiber optical transmission system to, have easy equipment of code transform, have more level jumping, contain the abundant timing information, the convenient clock is drawn, there are advantages such as certain correction capabilities,etc..
Employ doing the format of code of interface in the pulse code modulation terminal installation of high order extensively, proposed as the format of code of line transmission too in the speed is lower than the optic fibre digital transmission system of 8 448 Kb/s.
This text directs against the requirement of the format of code of communication transmission of optic fibre and code principle of CMI yard, recommend one to regard chip of EPM series 7064 as the hardware platform, regard Max +Plus as the software platform, regard VHDL as the developing instrument, the cipher scheme of CMI Cod... Read more
Original agreement (SIP agreement) of conversation It is a kind of control protocol of application layer used for IP network multimedia communication, can set up, revise, and stop multimedia conversation. SIP has good interoperability and opening, support many kinds of services and have multimedia to consult ability, can carry on mutually through SIP server or other network servers among different apparatuses. SIP is easy to expand at the same time, support users to be excursive and can fully satisfy apparatus’ demands for excursive service, and SIP is simple and flexible, computational complexity is small, are especially suitable for applying in embedded application environment. So, lead SIP into embedded application and improve the interoperability of the embedded network equipment and convenience of the access network effectively while relying on SIP autogenous characteristic. But a gentle legal justice and message handling that the human language described which provides ... Read more
Require oscillating period T =1~10S, is chosen the resistance, electric capacity parameter, and draw the connection diagram.
Solve
Circuit, its oscillating period’s C) RR(. T21270+ =. If choose
So the resistance-value range of the variable potentiometer is =− =K~) S~(R11711270101
So chosen =KR12. Minimum oscillating period
... Read more
GPSOne comprehensive GPS, CDMAlX (the packet data swap network of code division multiple access) , GIS (geographic information system) And Internet technology, the location technique that it is American Qualcomm in order to be developed on the basis of business of position, adopt Client/Server way. It will be wireless to assist A-GPS organically with the periodic line AFLT triangular location technique of the advanced forward direction to combine, realize high-accuracy, high usability and alignment at a high speed. In the environment that can’t be used in A-GPS location technique, will switch to AFLT triangular location technique automatically, guarantee fixed success rate and precision. Design individual with positioning, controlling and warning function of concurrent implementation to position the terminal station on the basis of GPSOne module DTGS-800 and low power consumption one-chip computer MSP430 here.
Hardware design of zero-one system
Individual positions ... Read more
1,Foreword
With the swift and violent development of the modern high-speed processor, the treatment technology of the picture is ripe day by day too. Among them, video dectection and tracing which move the goal are the image manipulation, analyze a applied important field, it is the research front of the present relevant field. Move goal video dectection and technology of tracing, there is extensive application in the civil field of navigating in robotic vision, traffic monitoring, visual prewarning, machine etc., playing an important role in military respects such as fire power intercepting, guided missile TV and infrared video guidance,etc. at the same time. Regard DSP and FPGA as video discerning and hunting gear that the key device forms on the basis of the two-dimentional revolving stage, can work in televised image or two infrared wave bands, realize every function of image tracking. Low, problem that processing rate is slow that the hunting gears of tracing alg... Read more
Lay guide think semiconductor announce ispLEVER a few days ago Classic designs edition of the toolkit 1.4. IspLEVER Classic design software has been already staging, Synopsys Synplify Pro adding HDL Analyst function and collecting, and improved ispMACH 4000ZE CPLD Fitter, there is better power consumption that optimizes the function.
Synplify Pro HDL Analyst has offered to designers and realized the high-order register transport level (RTL) ocularly fast Method of Verilog or VHDL. Designers can inquire alternately, it is most efficient for goal CPLD device by way of guaranteeing his code used between picture and source code. For example: Finite state machine (Finite State Machines, FSM) It is the common function in CPLD design. FSM and reveals, there are arrowheads of change of state and a state coding schedules by way of bubble picture by HDL Analyst automatic abstracting.
In order to minimize dynamic power consumption of ispMACH 4000ZE CPLD, Classic 1.4 fitter can... Read more
This text has designed a robot based on MC68HC08 series one-chip computer of Motorola to chase and run the control system, the ones that are used for studying between the robots are simple and interdynamic.
Behavior description of the mobile robot
In this system, we name one for two mobile robots as ” cat ” ,One is named as ” The mouse ” . When two robots can’t receive the signal that the other side sends out, the robot ” cat ” Advance with the sigmoid, the robot ” mouse ” Swing 180 degrees in where it is; Act as the robot ” The cat ” Detect the robot ” The mouse ” At the signal sent out, in order to chase to the robot ” mouse ” sharply Direction,and robot “mouse” Receive at the same time ” The cat ” Signal,last ” the cat ” Israel sharply movement forward, Israel Chase,until escape from “cat ” Coverage,is it unable wi... Read more
With global resource shortage, environmental contamination and deterioration of ecotope, study and already become the theme studied in development of car in compatibility of car and environment. Natural gas car have, discharge the intersection of pollution and reduce, the intersection of fuel and the intersection of economy and fine, the intersection of safety and high, the intersection of engine and advantage such as being longe-lived notably, considered to be the most promising kind of car fuel in the future. Driven by such strong market demand, the oil changes the angry scheme imperatively, the data that can be gathered according to the outside of car carry on analysis, research and design to it.
Overall structure of the zero-one system
This system regards FPGA as the centre, mainly include the following parts: (1)The collecting part of the signal: Including a series of car sensor, obtain engine every parameter in real time; (2)ECU module: Systematic control core... Read more
Output voltage D/A converter of a common bipolar
Fig. 1 inputs for the bipolar output D/A converter [2 ] of 3 bit. Under not inserting inverter G and deviation resistance RB situation, its output voltage is unipolarity, it is an ordinary 3 bit resistor network D/A converter, the output voltage of getting, negative polarity, for this reason set up the deviation circuit composed of RB and VB in Fig. 1.
According to the relation between true code and base complement, insert a deviation electric current in the input end of every amplifier, make, it inputs most significant position into to be 1, and other everybody input for 0 o’clock, export VO =0. In order to make the input code equal zero for the output voltage at 100 o’clock, so long as make IB and I at this moment equal, so should fetch:
Receive the intersection of D/A and input end of converter behind the oppisite phase sign bit that input, get the intersection of bipolar and the intersection o... Read more
Foreword
Recently, I find in the stream radio calling system project based on field bus on some factory large-scale production line, because the expicity information flow needed is greater, with the Off-The-Shelf LED display screen control system that makes up on the basis of AT89C51 chip, because of receiving a great deal of restrictions such as processing rate, system framework, addressing range, peripheral interface resource of the microprocessor, already difficult on condition that demand to reveal more picture element, reveal the great of vertical rate of the content, dynamic display effect are complicated, get the good dynamic visual effect. To the above-mentioned situations, on the basis of utilizing existing resources, have redesigned and developed a kind of brand-new one, hardware structured flowchart system of LED display screen control graph zero-one system composed of high-performance ARM microprocessors of the 32-bit microcomputer, and carry on real-time data commun... Read more
