In PSpice simulation in digital filter transmission line design

Designers using Pspice simulation is mainly for analog circuits.

However, it can also be simulated digital filter. A digital filter main part is the delay element, Adder and multipliers. Adder and multiplier can use operational amplifier, delay element can be used a transmission lines to simulation. The transmission line in PSpice is a forgotten for a long time, it can realize the delayed a few seconds.

　　

For example, Figure 1 shows a second order of digital filters.

The filter's transfer function is:

Of these, H (z) is a digital filter transfer function, and variable z is the z-transform, but Ai is the transfer function of the denominator of the coefficient polynomials, Bi is the transfer function coefficient polynomials of molecules.

Use the filter design software can get the values of these coefficients (bibliography 1). Sampling frequency fS and transmission delay is t = 1/fS. For example, a band-pass digital filter with 900Hz to 1kHz of 3dB passband, sampling frequency for Butterworth characteristics analysis 6kHz, can have following transfer function:

At this point, transmission delay to 1/6000 = 166.67ms.

If you set for the transmission of additional 1 Ω impedance of Z, the transmission lines of argument for Z0 = 1 Ω, and t = 166.67ms. Figure 2 is PSpice circuit. VCVS (voltage-controlled voltage source) E1 and E2 emulation voltage follower, and E3 and E4 and VCVS and their connected resistor is simulation Adder. Figure 3 is the simulation results.

　　

Based on the MPEG-4 and RTP network video monitoring system research (1)

First, the video surveillance system overview

Video surveillance system is an integral part of the security system, it is a preventive capacity strong comprehensive system.

Video surveillance with its intuitive, easy, and information content rich and widely used in many occasions.

Traditional video surveillance mainly to simulate the system (i.e. CCTV system) as the primary, the transmission distance from analog video signal, usually suited to small-scale regional monitoring (such as a single building, the small-scale establishments, etc.), not remote monitoring, the part of the independent operation, system expansion capability, the new device is added to the existing system, in recent years, with the computer, network, and image processing, transport, technology, video surveillance system is moving the front-end integration, video, digital, monitoring, networking, systems integration, video processing and intelligent direction.

Figure 1 video monitoring market forecast

You can see from Figure 1, since the analog system in many ways more difficult to meet user's requirements, since the beginning of the 1990s, digital video surveillance system in occupies a major position, slowly and eventually replace the existing analog system.

Digital video surveillance is an information technology as the core of security electronics technology development.

Digital signal spectrum efficiency is high, high anti-interference, distortion, which can carry out data processing to enable convenient query retrieval possible; you can use the network video stream transmission distance, open protocol, enabling security subsystems and security systems and other information systems for networking and information exchange and sharing. Flexible, economical and practical, digital video surveillance coverage monitoring camera equipment, codecs, video matrix, storage devices, video management platform, transport networks, and market products.

As the global counter-terrorism and other changes in the international situation, as well as on existing monitoring system networking requirements, many emerging video surveillance applications such as cross-province/cross-city large enterprises need cross-domain security monitoring requirements, personal, home security, and so on, General digital video surveillance system is very difficult to meet these requirements, the system essentially on video surveillance system requirements are based on a large-scale application, for these occasions, we need to consider a number of new issues.

In addition, business customers of the monitoring system also remain in their own self-maintenance of building their own private network mode, client monitoring products are made from a private agreement, products are closed, cannot, by establishing their own self-maintenance mode on the customer's technical level and maintain force have raised very high demand, industry will need to monitor and control system of building and maintaining the separation from the consumer, by a professional team to complete.

Therefore, operators to launch carrier-grade video monitoring service that provides the user from the network to the device, from construction to maintenance package solution is to meet the needs of the industry, operators can provide different user needs to hire or purchase of flexible service, the user's video centrally managed at the same time strengthen the data backup functionality, allowing users to query data are more accurate and fast, greatly reduces the customer's monitor.

Operators to launch carrier-grade video monitoring service for this new market presents the following advantages:

(1) from the security industry chain, the traditional three-tier structure of the value chain (manufacturer-sales agents-engineering and System Integrator) primarily small and medium-sized projects (capital/scale/users), but in the emerging applications such as large system "safe city" project and a large number of individuals and families of video surveillance in a comprehensive application, the traditional three-tier structure of the value chain to a large extent, has been hard to adapt.

Introduction of telecom operators involved in the construction of large-scale network video monitoring of the model will be the best option, in the capital, scale, technology, and other aspects will give security industry brings revolutionary change.

(2) the majority of users, including public users, large and small businesses users have personal home user, the fundamental purpose of mainly want video monitoring on public order, health or family enterprises carry out effective monitoring to improve law and order, effective management of enterprise and domestic security.

And when the system in the course of a problem or unable to meet the current situation, for itself and does not have a very strong security professional and technical capacity of the users will be a major difficulty. Government/public security's core values is to maintain public order, ensuring a good social environment, the enterprise's core value is to generate more profit, and video surveillance as a tool, if you have the ability to be managed, that video surveillance as an operating business, users only need to care about how to more effectively use becomes the market trends, make public or businesses are able to put more focus on improving your own core values.

[1] [2] [3]

Marker video Blue Star fourth-generation DVR full listing (1)

We all know, this stage of the application of the monitoring programmes shall be compatible with the alert scheme and alarm is triggered after the first transmission to the control room.

At check-in staff will need to first-time verification through monitoring picture, this time as short as possible, the faster the view presents the more rapid processing events. However, the traditional meaning of verifying all refer to view the site in a way to confirm that the current situation picture, this is only one way, I can only see the current situation, which presents the situation after already occurred, there are more important to see the warning is triggered even trigger position before, and in time, this will occur as soon as possible after the Aviso view video recording. You can have immediate playback after alarm Aviso? can, but need time, users often need to wait a few minutes before they can view the Aviso, the wait is fatal, and that is what we usually say that cannot be registered on that. Blue Star fourth-generation DVR is designed for digital video and the design of dedicated file system, completely changed the traditional video recording mode, start recording after 1/4 seconds to synchronize playback, do a video that is recorded or broadcast, no waiting, thereby greatly improving the efficiency of the Aviso playback.

One of the core value of the DVR is used for video playback, it's a core value that is stored in the video store, video materials security has become a topic of most concern users.

We know, DVR recording information in the hard disk on your PC are General, and video information file is used by the file system is a Windows file system and the PC is the same, then it means that the DVR to the hard drive in the PC can be used with our daily processing files, hard disk video information can be seen on the PC, then you may have accidentally deleted or even malicious deletion, and modification, make videos of uniqueness and security cannot be guaranteed, that is what we usually video be removed or altered, Blue Star fourth-generation DVR can do hard disk connected to your PC cannot see the file on your hard disk, even if you quick format a hard disk, nor will undermine its videos, so the most direct and effective prevents videos from being deleted and tampering, guarantee the videos indestructible.

The most basic DVR is used for video storage and video playback, if you want to put the DVR's core values to the maximum extent, you must resolve all three of these core issues.

As always focus on independent research and development technology of Blue Star perfect solves these problems, it can be said is really solves three problems of digital video, fill the three demerits of digital video. In addition, the Blue Star fourth-generation DVR in unique functionality also enables breakthroughs:

Unique to strengthen the entire way synchronization of playback, Blue Star fourth-generation DVR support all-CIF models will playback, such as 16-ch CIF models that support 16-way synchronization of playback.

Unique graphical retrieval to timeline as the main line, intuitive display video segment of nature and time distribution, fast and accurate playback the video.

Unique site hold feature in some particular point in time, such as the observation of a social security number, license plate numbers, and other important information that can be immediately frozen static observation details screen.

Unique spot, the playback screen is displayed, i.e. monitoring scene picture and view video playback two not delay.

View more pictures of the scene, one screen can be used to playback video, which guarantees access to video material needs, but also do not miss out on the field of monitoring.

Unique backup video native playback, any videos via USB disk or burn a CD or DVD drive, and other peripherals, subject can be backed up on your PC to view, in connection to DVR, the DVR also can be used to retrieve and play.

Unique in its own device-level troubleshooting, the equipment of various failures can real-time monitoring and alarm, security equipment and stable operation.

Blue Star believes that future competition will focus on close to user needs features user-friendly, fine processing, who can break the siege, the one who will go further.

Blue Star from its inception has been adhering to the "quality from professional" business purposes, always focus on product innovation, focus on the production of quality monitoring, focus on user requirements, the focus on market brand image.

In DVR product maturing product homogeneity serious situation, 2010 Blue Star, in detail, thoughtful user, end DVR will be end of rumors, DVR can go further. In the embedded digital DVR product areas, since January 2001, Blue Star publishing domestic first BSR-2001 embedded digital hard disk recorders, and have completed the BSR-3000/4000 series and BSR-5000/6000 series DVR upgrade, domestic manufacturers are development, after 10 years of process, product and industrial pattern shape, but monitoring market networked, intelligent, high-definition of requirements will be led to the DVR on the renewal form in the product. In network connection, the DVR will merge the functionality of the DVS, NVR with powerful networking capabilities; in an intelligent, is intelligent storage and retrieval, and video analysis; in high-definition of image sharpness will gradually from CIF to D1 to 720P and above resolution.

[1] [2]

See domestic family video monitoring next spring? (1)

Family integrated communication, entertainment and information services, home security, intelligent home and remote control is information-based products for the family of the four main directions, home video surveillance is the core of home security products.

According to the digital home nuoda Advisory series report---family information product planning, research and analysis:

Overseas carriers introduce home monitoring service

United States at & t combines it in fixed telephony, mobile telephony, cable television, Internet and other network infrastructure advantage, and Agere Systems combined, trueone solution can provide the user with carrier-grade mobile phone or PC video surveillance applications, as well as iptv, voip, and other large amounts of data, the digital home of intelligent monitoring services delivered to a remote PC or mobile phone that supports wireless and Wired video surveillance programme.

United Kingdom Telecom's digital home gateway known as the bt homehub, provide the user with information, communication and entertainment services, emphasizing the ease of use, Plug and play, plenty of connectivity, also stresses integrity, through diversification of family terminal provides a variety of services to support a variety of intelligent monitoring device data interface and physical interfaces, video surveillance is more focused on the network camera.

France Telecom has a corresponding action, their brand is to live with unified brand packaging, like livephone, livemusic, livezoom etc devices.

The livebox through ADSL access to the Internet, and then through the digital home of wireless access methods to access a variety of monitoring devices and intelligent household appliances, France Telecom's video surveillance called livezoom, is axis206w wireless webcam, an embedded web server, is very rich, known as the world's smallest wireless network camera.

Spain Telecom tde home network business follow "communication (communications), multimedia (multimedia) — security, local & remotemanagement (security, local and remote management) — automation (automatic control)" in the line, in business to provide adequate, with bandwidth can support multiple family characteristics of subnets.

Using osgi-based webservice programmes on the various devices within a family based monitoring of web Forms. Mainly for any business to have sufficient bandwidth to support multiple families, mainly families in different qos guarantees between the business, but also through wifi gateway family network and interface network to make use of the Internet, wireless in anywhere you can access various services on the indoor equipment can remote management and maintenance, remote monitoring of equipment or the use of wireless WiFi protocol access gateway, the industry known as full of art wireless intelligent digital home solutions, more focused on wireless network camera monitoring programmes, the use of the osgi framework.

Japan Telecom's nttdocomo phones use of their own in the mobile service advantage, launched i-mode mode operation mode, either directly through a mobile phone or PDA remote control intelligent home appliances at home, in the remote control uses the concept of "m2mremotecontrol", human and machine (mantomachine), machines and machines (machinetomachine) between the remote control.

Ntt offers available through the Internet or foma handset control hc-1000 monitoring camera. The device uses a 3-megapixel cmos sensor, 2 x digital zoom, Ethernet interface, support for 802 .11a/b/g, you can shoot video qvga quality. Built-in "active defense" systems, squawk alert sound scare robbers. Even microphone/speaker, bi-directional communication system to facilitate negotiations with thieves. In addition, ntt-neomeit (ntt West Japan subsidiary) has launched the via pda or cell phone remote control home appliances and receive monitoring alarm information service, highly convenient.

[1] [2]

Car security market launch cell phone remote control storm

Imagine you are participating in a business meeting, your iPhone received a letter marked with ' auto theft alert "e-mail.

The email alert and you attempt to break into your ToyotaLandCruiser, thus activating the auto alarm.

After a few seconds, another email notifying you that your LandCruiser engine has been launched.

Your finger to click the icon on the iPhone screen, showing the real-time status of the vehicle interior, a stranger is manipulating your steering wheel.

Another icon to display a map, show your car parking before leaving the company after going.

You withdraw from the Conference, dial 911 and notified the police to the location where your LandCruiser.

Next, you then press the ' stop Auto ' icon to send a message to Toyota's control center, force the engine to stop the LandCruiser. Then, you check the video again, with the car to stop running, you can see the thieves of confusion and unhappiness. In the end, when the car is completely stopped, you will see the thieves will hand on head out the door, was arrested by the police.

"Although this sounds like science fiction, but on Toyota, these capabilities in Japan have already achieved, the company through its G-Security system, as well as G-Link, G-BookmXPro and G-BookAlphaPro remote communication system, offers a range of accessible through mobile phones or PC remote control cars and provide security services feature," iSuppli automotive electronics analyst HitomiLarson said.

In addition, other OEM manufacturers have joined the competition, provide more solutions.

For example, Nissan (Nissan) is the next in the Japan market, on the mobile device services of automobile manufacturers, it is expected that its products and services will come out in 2010. Similarly, other mobile device connectivity solutions will also be in 2010-2011 years in the United States and around the world.

Toyota is Japan's first company to provide car mobile device connectivity and security solutions for enterprises.

Other OEM manufacturers such as Subaru, Mazda (Mazda) uses a Toyota company G-BookAlphaPro and G-Security system. In addition to the above mentioned features, G-Security also allows the user to the phone via PC or remote control door lock, power Windows and warning lights and other equipment.

"Although in automotive interior use mobile devices as a connection interface is not nothing new, Japan manufacturers have become accustomed to using cell phones for mobile navigation, then the content will be delivered to the automobile," Larson said.

"However, some automobile manufacturers are trying to further expand the use of mobile phones as a direct communication channel, for example through a mobile device to send and get vehicle information. ”

Active based on nRF9E5 UHF RFID system design

Based on the CAN bus of intelligent fire alarm system design (1)

This design of intelligent fire alarm system, using CAN bus III communications networks to fire for monitoring objects, using computer technology, testing and field bus technology, under the fire protection requirements and characteristics of the design, composition and work.

The system can both fires occurred early detection and automatic alarm and location under fire, timely output joint fire signal fire facilities, fire-fighting. Practice has proved that the system has a smart, responsive, high reliability, etc., can better meet intelligent building on fire prevention requirements.

1, introduction

Early prediction of fire has been put out the fire, reducing fire losses, protect life and property safety protection is indispensable to modern fire safety measures.

Fire auto-alarm and control system has been widely used in various types of construction and engineering. How to enable multiple independent systems constitute a unified fire monitoring network, is that we must look to solve urgent problems.

2. system composition

2.1 CAN bus

PROFIBUS CAN be used in the production of the bottom of a bus topology of the network, is currently the only international standard fieldbus, can realize fully distributed multiprocessor system, the number of nodes up to a maximum of 110, the transmission medium is twisted pair or fiber.

CAN bus with its strong anti-interference ability, the high communication speed and transmission distance, form the system simple and cost-effective high benefits in occupies the entire market, and intelligent region has been widely used, has been recognized as one of the most promising one fieldbus. Compared to traditional communication bus 485, CAN bus also has many advantages: work in a number of main mode, improved system reliability and spirituality; the perfect communication protocols can be used by the CAN controller chip and its interface chip, which greatly reduces the difficulty of developing the system, reducing the development cycle. At the same time CAN bus in larger data capacity of system network strong processing power and advantage, so CAN bus very suitable as a smart range of underlying network of trunk roads. It is precisely because of the advantages of CAN-bus, so this article uses the CAN bus formed by the three levels of traffic control systems.

2.2 L3 Communications control system

Based on the CAN bus of intelligent fire alarm system of chart shown in Figure 1.

The system consists of three levels of communication control system. This three-level communications control system are: first level: the master computer via RS-232 bus receive central controller alarm information; level 2: central controller via CAN bus receives regional controller alarm information; third-level: user-side automatic alarm in the alarm message via CAN bus transport to regional directors. This three-level network can consist of different network types, response, for a small area, the system can omit regional controller. Visible, the system for different objects to achieve an optimal price-performance and most extensive application coverage, improved product competitiveness and expansion of special convenience.

From where you can see in Figure 1, the system automatically by user-end alarm, regional directors, central controller and master computer four parts.

It works when the system is running, the user-side automatic alarm main complete onsite fire signal acquisition. When the user-side automatic alarm detects Aviso, via CAN bus transfer to the regional directors, through the regional controller transmitted to the community management monitoring center of central controller and to the relevant departments (Management Center or head of household) alarm signals. This system of the host computer also has a central controller received the alarm message via LED accurate display features, such as the floor, Aviso, area, door, and the fire mode, prompting security personnel to quickly confirm the Aviso, promptly rushed to the scene to ensure the safety of property and life in the laboratory. Due to the can bus from transmission line distance as well as the number of nodes, the node tolerances up to 110, therefore, for large and medium-sized area smart community, proposed a three-level control system of the programme, namely in central controller and client automatic alarms between joining regional controller. Following on the parts of the system described.

　

3. hardware design

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Jietonghua acoustic voice synthesis technology services Anhui Hefei airport

Recently, jietonghua acoustic voice synthesis technology to be successfully applied, hefeiluogangjichang synthesis effect comparable to a professional announcer.

Excellent technical support and advanced service concept, jietonghua acoustic voice synthesis technology help hefeiluogangjichang greatly enhanced airport service quality, perfect service system.

Hefeiluogangjichang is connecting East and West of Anhui Province and developed coastal areas of important aviation hub, with outgoing flights hefeiluogangjichang throughput and sorties were increasing, flight information increases, if only by a large number of artificial broadcast special complex information, can not meet the current development needs, needs to be more efficient, timely, accurate way to do transmit this important task.

Jietonghua acoustic voice synthesis technology fills the blank, compared with traditional artificial broadcast, text input machines converted to voice broadcast not only save on labor costs, but also can take real-time updated flight information fast, timely communication to passengers, allowing passengers to travel more easily, without having to worry about.

All major airlines on customer service system put a lot of the human, financial, as the ability to manage work and a variety of information resources on unified information platform, has reached both orderly and efficient service levels, and can play a uniform corporate image, brand won the double advantage of customers.

Department of our industry-leading jietonghua sound speech synthesis products, sufficient to consider the various factors, tailored for the customer to build air voice service solutions that enable customers to save budget cost, and to improve service quality and efficiency, as it laid the Foundation for integration services.

In recent years, jietonghua sound speech synthesis technology continues to achieve technological breakthroughs, at present, the voice technology in the domestic market share up to 50% and rising, speech synthesis products have been successfully applied in various industries, especially in the aviation field very prominent, can according to user requirements for selection, and supports multiple languages, in Chinese speech synthesis technology, you can provide English, Japanese, Russian, German, Italian and other languages in synthesis technology, capital international airport, Shanghai, Chengdu shuangliu international airport and other large international airport has been successfully applied.

Jietonghua acoustic voice technology with a strong technical support and good after-sales service, won the popularity and indentical praise from customers both at home and abroad.

GetJar, intelligent human-computer interaction of applications will become more and more widely.

Walkers a true traveller, a sound as jietonghua focus speech synthesis, handwriting recognition, speech recognition, intelligent human-computer interaction, technical service providers, will continue to work in the intelligent human-computer interaction in the field of work, to develop more and better application of the new, intelligent human-computer interaction technique brings convenient services to the wider population.

2009 China fingerprint lock market demand analysis (1)

The first section, needs analysis

«Ò» ¡ ¢ product demand

The quality of life with the residents, residential, automotive, office buildings and hotels, etc., the rapid development of the pillar industries, as well as national defense, public security, and financial system on high portability and security of fingerprint products growing demand.

Locks of the consumer market in biometric technology, electronics and other high technology products is also fundamental in a blank stage, but the market of consumer population demand for fingerprint lock wishes it presents each year more than 40% of the high growth in 2009, the Chinese domestic market for fingerprint lock, the share of high-technology products will reach about 10 million sets.

Second, price demand

Europe and the United States with electronic combination lock, remote control lock, the price is relatively high, margins also exists, but the domestic production of these high-tech enterprise of the lock.

In recent years, China began to introduce into their production from the fingerprint lock.

III. channels demand

Along with the fingerprint technology continues to mature and developing, the gradual reduction in production costs, fingerprint technology-related products will usher in a period of great development.

The present United States, United Kingdom, Japan and other developed countries have provisions on the entry of foreign citizens in the airport security check will capture fingerprint; United States already in the territory of 115 airport installed fingerprint scan detection system; Japan immigration authority also provides that the port on the immigration of foreign citizens is also collecting fingerprints; preparation for the 2010 Shanghai World Expo held at the Shanghai mass transit will introduce fingerprint security inspection. All of this shows that the fingerprint technology is about to enter the outbreak-growth period. But on the other hand, fingerprint lock of greater market is the civilian market. The popularity of the civil market, currently the biggest obstacle exists mainly manifested in two ways: first, the concept of reasons, many people lack of understanding of the fingerprint lock, a little "greener pastures", or even think that it does not have a traditional mechanical lock for safe and reliable, in fact, this is the deviation of the fingerprint lock. In fact many people used the fingerprint lock later often inseparable from it, because the fingerprint lock not only more secure, but you sure can give rise to a great convenience, with it, you no longer have to keep and carry a big bunch of keys, this is the modern embodiment of modern life and the pursuit. So for fingerprint lock manufacturers, consumer guides and universal access to education, there are a lot of work to do; the second is price reasons, lock the price also does not have to install the ordinary people can afford. Because at present able to batch manufacturing enterprises, also is the fingerprint lock not to enter the large-scale industrialization phase, with the scale to reduce manufacturing costs. 2009 Beijing Olympic years later, is China's rapid development of fingerprint lock market. With some luxury flats, fingerprint lock market application will enter a phase of rapid growth. Currently, the focus on the development of project real estate market. Fingerprint lock to project real estate market focus for development. Fingerprint lock civil market potential value, after assessment, really great, but as a stylish, futuristic high-tech products, to enter the civil market, must be put in a large number of ads, leads the consumer trend. Civil market development, spending a significant amount of sales force; whereas the same sales force in engineering market inputs, a works contract it is often the hundreds of thousands, or even the fingerprint lock, the scale effect in stark, relatively fixed regional also significantly reducing post-sales installation and maintenance costs.

4. purchase requirements

Consumers at the time of purchase, price is the first consideration, the fingerprint lock products regardless of the structure or price are superior to their potential substitute products.

When consumers buy products, product quality is the second consideration. Internal fingerprint lock manufacturers to increase product sales, it is first necessary to win the hearts of consumers purchase, the price advantage, increase the product's technical input. In addition to the safety performance, frequency, by referring to the response speed, recognition rate, additional features are the key indicators, intelligent also owners understand accept and simplistic. Now intelligent system is normally provided by the developer to provide hardware products, property companies provide software maintenance, community owners for intelligent device know enough depth, is one of the most important equipment failure.

The second section, supply analysis

«Ò» ¡ ¢ product supply

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High resolution video surveillance camera market ready for takeoff

Frost & Sullivan company Chief Analyst will today (April 8) publish high resolution video surveillance camera market.

London March 31 messages in recent years, the video surveillance camera market undergoing dramatic changes.

Camera manufacturers are rapidly improved to meet the growing security needs. As the video surveillance is in the shops from low-end to high-end goods of critical infrastructure, manufacturers are faced with ever more opportunities.

2010 April 8, Frost&Sullivan company will in the next quarter on high-definition video surveillance camera market analysis briefing to discuss the development of this market.

The report will include technical trends, camera market size and competitiveness trends analysis of the three aspects.

Camera components suppliers in recent years considerable progress has been made, this help camera manufacturers introduced advanced technology and rich functionality and economic solution.

But the latest progress provides more image details and realized in a variety of applications must have a smart analysis of video and video localization functionality.

"In addition, advanced integration technology and remote monitoring technology combined with falling commodity prices, will monitor as a secure and not secure areas are more economical solution," Frost&Sullivan company electronic security group senior research analyst ArchanaRao said.

Recent market research to further explore the large number of IT companies entering the video surveillance industry.

The update through a discussion of technology trends and provide the European high-definition video surveillance camera market prospect forecast, would be of benefit to video surveillance camera vendors, component manufacturers, surveillance cameras resellers and integrators on the market of the judgment.