The difference Plasma TVs with LCD TVs
Television tube model with technology Cathoda Ray Tube (CRT) or cathode ray tubes that have been aged 75 years, gradually been replaced by hi-tech flat-screen TVs LCD or plasma TV.
The biggest drawback of CRT TVs are perceived electronics manufacturer that has reached its size limit. This causes the magnification of the size of the TV means also have to change the dimensions of the tube. TV size 29 inch alone account for a large room especially for the thickness of the tube.
Though the audience requires a large TV for the convenience of the eye. No wonder the tube TV technology is not currently developed.
On the other hand, LCD televisions and plasma TVs have a size smaller. Thickness of the TV is only a few inches that makes it easily placed anywhere in the room. Could stand on the floor, taped like painting on the wall there is even a TV manufacturer could advertise their products on display high on the ceiling.
The main cause of this model is more compact TV is not needed on screen projection unit. Utilizing conventional tube TV technology as a treatment of electron particles. A gun-shaped tool, while the TV is connected to the mains, will shoot a beam of charged electrons or negative atomic particles to the screen. The electron is then captured different screen phosphor layer and the color intensity, so the picture emerges.
DIFFERENT with conventional TVs, LCD TVs use the same technology with a laptop screen or flat screen monitors. In addition to compact size and lightweight also has a higher resolution screen. LCD screen consists of millions of crystals wrapped in a thin glass layer. Each of these crystals have different responses to electrical energy. This is what makes the display on the screen was so varied in color.
Plasma TV screen using the technology in the form of small glass balls that contains a gas called plasma. When energized electrical energy, gas, plasma is out ultraviolet rays that burn the layer of glass on the screen. As a result, the screen changed from black to colorless.
That's the fundamental difference of plasma TV technology with LCD TVs. There are many other differences of both technologies, such as size and flat screen technology.
LCD TVs have limitations in terms of its dimensions, because the LCD is actually designed as a computer monitor. Currently, the largest screen is a Samsung 46-inch size. TV was launched mid-2004, after previously shown at an exhibition of electronic and household appliances in New York, April. Therefore, the size LCD TVs are generally located in the market currently ranges between 15, 17, 20, to 22 inches.
Plasma TVs have a screen size is much bigger, designed for audiences who liked the TV screen above 37 inches. The size of plasma TV can reach 76 inches. So it is not surprising that the fans chose to put together a big screen with your home theater.
But once owners of plasma TVs should be prepared with a soaring utility bills. This is because plasma TVs power consumption doubled from LCD TVs. The main cause is? Is the cooling system of the screen.
Plasma TVs need a fan to 'cool' plasma TV screen that is not too hot when used in a long time. Therefore do not use the combustion process, the LCD screen has a longer life than plasma screens.
FROM the side view the TV picture, both have different characteristics. Screen plasma TVs tend to not able to display black properly. In fact, compared to CRT TVs though, plasma TVs are still lost in producing a dark black color and dark gray shades. Another problem that static images for long periods such as logo of the TV station could not quickly disappear from the screen. Shadow still remains even though the TV broadcast has been moved to other impressions.
In the matter of the quality movement of the picture, plasma TVs have the advantage capable of displaying fast moving images. So the displacement image as an action movie (action) is more comfortable to watch at the plasma TVs. Then viewed from the point of view, plasma TV to have the benefits can be watched from every angle, just like conventional TV.
Usually, plasma TVs sold in the form of video displays, so that remains to be burdened with buying a TV tuner (tuning wave) and speakers.
Conversely LCD TVs are sold complete with speakers and tuner. LCD TV screen has the ability to display a clear black color. To find comfort in watching, eyes must be directed straight at the screen. When viewed from the other side, who looked only a shadow only. LCD TV profits are not require excessive cooling system, so that his voice is more smooth than plasma TVs. So, could be an option for those who need a screen for computer and watch TV.
For those who intend to replace his TV with a large size, some other aspect to consider is contrast ratio, aspect ratio and resolution. Contrast plays an important role in producing images that comfortable to watch. The value refers to the dark or bright screen. The higher the ratio, the better the picture display.
Average LCD TV has a contrast ratio ranging from 400:1 to 800:1. Plasma TVs ranging from 600:1 to the most sophisticated has the ability to 1.500:1.
The size aspect ratio describes the ratio of width to height screen. Conventional TV uses 4:3 format, while the large-screen TV use 16:9 ratio. This ratio does not vary much with the format used in cinema industry, which is very comfortable to watch DVD movies on the big screen, considering the comparison is not much different from 1.85:1 16:9.
In choosing a TV should be considered also aspects of the resolution. Plasma and LCD TV products already use the technology for fixed-pixel arrays. This means that this product already has rows and columns are fixed for a specific image format. In general, a good quality TV that is classified as high definition, if a resolution value of more than one million, ie starting from 1280 x 720, 1366 x 768 and 1024 x 1024.
Resolution for conventional TV's most high 852 x 480 so-called enhanced definition. Standards for TV tubes is generally located at a resolution of 640 × 480 and 720 × 480.
The difference is what makes these two technologies memunyai respective markets, as needed. Moreover, in terms of pricing is also much different.
quoted from : http://ilmupengetahuan-teknologi.blogspot.com
Wednesday, April 20, 2011
Sony DSR-PD170
This camera is very familiar and many users in Indonesia, from TV cameramen, Production House, until Wedding cameramen. Perhaps the many advantages of this camera that affect the decision to use the Sony PD170.But make no mistake there are some images that can not beachieved by using this camera . For example: we want to get a picture that only focus on objects with background blur, can only be in the position of extreme close-ups and can not be in the position of medium or more wide.
With so many cameramen who may be from the first study to years only know and feel this camera has become a true cameramen, should learn to type like a professional camera: Panasonic AJD610, AJD400 Panasonic, Sony DSR-400, Sony DXC D50 and others. Usually those who can operate one of these cameras will not have difficulty operating the camera other types.
So the Sony PD-170 camera is good and suitable for small-News cameraman as making it more mobile. For the production that require special pictures would be great to use a professional camera. *
Cable Modem
The internet has become even faster. Gone are the days of sluggish dial-up connections. Cable modems offer a way for you to use your cable connection to get high-speed internet access.
How do cable modems work?
First of all, data and information from the internet comes over the coaxial cable, the same cable that is used to give you a television signal if you have cable television. Coaxial cables have the ability to store a large amount of data, so there is plenty of room for both your television and internet.
The cable modem is what allows you to have both cable television and high-speed internet access on the same coaxial cable. There are several parts of a cable modem, and they each serve a different function. The tuner is the portion that receives the internet signal from the cable and then moves the signal to the demodulator. The demodulator takes the signal and the data that is on it and coverts it into a digital form that can eventually be read by the computer. Some cable modems also have a modulator, which takes the signal and converts it back to a form that can be transmitted back out into the coaxial cable.
High-speed internet access gives you a lot of freedom. You no longer need to tie up a phone line in order to have an internet connection. They also allow you to get and receive data at a faster rate because a coaxial cable has a lot of space, despite the fact that you also use the cable to get a cable television signal.
In order to enjoy high-speed internet access, you will need a cable modem. Understanding how the modem works will help you make the best choices, in terms of price and function, when purchasing one.
Cable Modems provides detailed information on Cable Modems, Installilng Cable Modems, Cable Modem Reviews, Uncapping Cable Modems and more. Cable Modems is affiliated with Computer Cables.
Article Source: http://EzineArticles.com/?expert=Kevin_Stith
How do cable modems work?
First of all, data and information from the internet comes over the coaxial cable, the same cable that is used to give you a television signal if you have cable television. Coaxial cables have the ability to store a large amount of data, so there is plenty of room for both your television and internet.
The cable modem is what allows you to have both cable television and high-speed internet access on the same coaxial cable. There are several parts of a cable modem, and they each serve a different function. The tuner is the portion that receives the internet signal from the cable and then moves the signal to the demodulator. The demodulator takes the signal and the data that is on it and coverts it into a digital form that can eventually be read by the computer. Some cable modems also have a modulator, which takes the signal and converts it back to a form that can be transmitted back out into the coaxial cable.
High-speed internet access gives you a lot of freedom. You no longer need to tie up a phone line in order to have an internet connection. They also allow you to get and receive data at a faster rate because a coaxial cable has a lot of space, despite the fact that you also use the cable to get a cable television signal.
In order to enjoy high-speed internet access, you will need a cable modem. Understanding how the modem works will help you make the best choices, in terms of price and function, when purchasing one.
Cable Modems provides detailed information on Cable Modems, Installilng Cable Modems, Cable Modem Reviews, Uncapping Cable Modems and more. Cable Modems is affiliated with Computer Cables.
Article Source: http://EzineArticles.com/?expert=Kevin_Stith
Monday, April 18, 2011
Know the DVB Standard Preliminary
Know the DVB StandardPreliminary
At this time we can say that the entire broadcasting chain starting from the production process to distribution of digital television has been done, but the last chain of transmission process to end-users are still largely conducted in analog. DVB (Digital Video Broadcast) is one of the systems used to transmit digital TV broadcasting until the end-user.
DVB development effort as a global standard for digital television broadcasting either via satellite or terrestrial originated from the formation of the DVB Project in 1993. DVB Project consists of approximately 250 institutions from 30's, country and consists of broadcasters, manufacturers, network operators, regulatory bodies and academic institutions. DVB Project does not perform the function as a regulator but a work based on business and commercial aspects.
In a further development of the DVB Project has successfully developed a series of DVB specifications are not limited to video broadcasting, but also has penetrated down to the applications and multimedia services.
This paper will try to give a bit of an idea of the DVB standard. Given the breadth and depth of DVB standards, this article can not possibly cover everything. For those readers who are interested to know more about DVB can read a variety of references are available, including through http://www.dvb.org or http://www.etsi.org.Why DVB
DVB was developed based on the background of the importance of broadcasting system which is open (open system) which is supported by the ability of interoperability, flexibility and commercial aspects. As an open system, the DVB standard can be used by vendors to develop a variety of innovative services and value-added services that are compatible with each other DVB devices from other vendors. In addition, digital programs transmitted by the DVB specifications can be transferred from one transmission medium to another transmission medium with a cheap and easy. The approach taken by the DVB is to maximize the existing tools and common system available in the commercial market.
With digital technology, DVB can utilize bandwidth more efficiently. One satellite transponder that is usually only used for one analog TV program, using the DVB can be used to broadcast the 8 channel digital TV. Besides the addition of a TV channel capacity, the terrestrial transmission media can be obtained better image quality and even the media cable TV, DVB-C offers two-way interaction.
One of the fundamental decisions taken in setting standards is the selection of DVB MPEG-2 as "data containers". With these conceptions of the transmission of digital information can be flexibly without the need to provide limits what type of information will be stored in "data container" is. Selection of MPEG-2 compression system for coding and done because it proved that MPEG-2 capable of providing good quality according to available resources. From a commercial standpoint, the adoption of MPEG-2 which is the standard of existing and proven very beneficial because it allows DVB to concentrate on its efforts in finding ways to package the MPEG-2 data packets through different transmission including satellite, cable, SMATV, LMDS, as well as terrestrial. Chip-sets for coding and decoding MPEG-2 has been commercially available so that the price of the decoder in the commercial market priced. However because the MPEG-2 contained in the ISO document is generic, then the DVB Project developed a document that contains restrictions on the syntax and parameters of MPEG-2 and recommended values used in DVB applications.
DVB Service future will consist of various types of programs developed through a number of transmission channels. For IRD to ditune for certain services automatically through a user friendly navigation system then adds a navigation aid DVB DVB-SI (Service Information) which is an extension of the Programme Specific Information (PSI) from MPEG-2. Service information in DVB serves as the header of the MPEG container so that the receiver can find out what it takes to decode the signal.
In addition, MPEG-2 decoder enables a flexible design as improving the quality of the encoding. Any increase in performance due to the development of new encoding system will be automatically reflected on the image quality of the decoder.Transmission
DVB standards can be applied to a variety of media ranging from satellite transmission (DVB-S), cable (DVB-C) or terrestrial radio waves (DVB-T).Standard DVB-S DVB Project is the first product that allows the delivery of DVB signals via satellite. The document describes the various tools for purposes including the implementation of the modulation channel pengkodingan Binary Phase Shift Keying (BPSK).Channel coding and modulation systems DVB on cable systems (CATV) is described in the document DVB-C standard. This document is the basis for further development for the specification of [DVB-CS is used, (Satellite) Master Antenna TV (SMATV).DVB also regulates the use of terrestrial transmission media in DVB-T specification. Utilization of microwaves for transmission via DVB MMDS (Multichannel Microwave Distribution System) can be divided into two specifications: for the MMDS frequencies above 10 GHz (DVB-MS) using DVB-S specification, while for frequencies below 10 GHz (DVB-MC) is primarily based on DVB-C.Conditional Access System
CAS (Conditional Access System) is a subsystem that serves as control access to programs or services that are able to receive just service users who have received authorization. CAS consists of several blocks of which mechanism to scramble the program or service, Subscriber Management System (SMS), Subscriber Authorization System (SAS), etc.. SMS is essentially a data base containing customer information of a service, while the SAS function encrypt and send the code-words that enable the IRD to mendescrambler a program. DVB Project is not to make CAS as part of the DVB standard. However DVB Common Scrambling Algorithm developed a, namely tools for scrambling Transport Streams or Program Streams Elementary. DVB liberate the use of types of CAS in accordance with the needs of operators from multiple vendors DVB members that offer a competitive commercial product.In addition to the DVB standard allows the occurrence of cross-medium interoperabillity which allows various different delivery media can be interoperable with each other, one aspect of interoperability is that all DVB-compliant devices from different vendors can easily connect to each other in a broadcast chain.However integrated receiver decoders (IRD), which uses a different Conditional Access technology may not always be interoperable with each other. There are two approaches by DVB for the occurrence of interoperating between various different CAS, namely:
* SimulCrypt, in this case some programs to negotiate commercial providers to enable users who already have a proprietary CAS IRD with embedded in them can enjoy the different services of the CAS due to supply the necessary proprietary information.
* Multicrypt, CAS technologies can be on one platform so that the same IRD can receive dibroadcast programs simultaneously from several different programs CASnya.
Interactivity
DVB system has the ability to utilize the return path between the IRD and the Service Provider via the module's Subscriber Management System. For the purposes of this return path is required modem and telephone or cable TV networks return path or even a satellite uplink. Return this path can be used to send signals back from the user as the application televoting, playing games, tele-shopping, and tele-banking, and also to send commands browsing on an internet website. Despite the limited bandwidth for the return path is not suitable for sending video images to move from house to broadcasters, the next stage of development is expected to allow for this to happen. In addition, DVB also offers a kind of interactivity without requiring a return path that is providing a variety of program choices according to user choice.
Many services are offered in DVB will require some form of interaction between the user and the program provider or network operator. This interaction can be a bit of a command transmission but may also require fairly intensive interaction as in communication via the Internet. Interactive TV identified as one of the important keys that will control the digital transmission system in the future. Various members of the DVB has developed a comprehensive plan for the introduction of interactive TV since 1997. The occurrence of convergence in this area allow for a turning point in the future world of broadcasting.Various specifications of the DVB return channel has been published by ETSI including the DVB-RCC (Cable) and DVB-RCT (Telephone or ISDN), which is the complement of the DVB-NIP (Network Independent Protocols) are based on MPEG-2 DSM-CC (Digital Storage Media-Command and Control).DVB allows the occurrence of these interactions and specify two types of tools for that purpose. The first is interatif tools that are network-independent which can be regarded as a layer 2 or three in the protocol stack of ISO / OSI protocol derived from the Digital Storage Media Command Control (DSM-CC) of MPEG.The second group is associated with a lower layer (layer 1 or two) of the OSI model / ISO in the form of interactive tools that are network-dependent. There are several specifications that have been developed, among others, through the Public Switched Telephone Networks (PSTN) and Integrated Services Digital Networks (ISDN). It also developed a comprehensive solution for interaction through a network of CATV, Hybrid Fibre Coaxial (HFC), Terrestrial Systems, Satellite Master Antenna Television Systems (SMATV), LDMS, VSAT, DECT, and GSM.Interoperability
DVB systems are designed to make the most common elements in the commercial market. This allows starndard used in distributing the signal without having to perform complicated processes in the process of decoding and re-coding from one medium to another. Interoperability between standards allows manufacturers to achieve economies of scale. Most of the same element used in all sisytem. The following diagram illustrates a common sequence found on the DVB IRD.Development of DVB
Results achieved by the DVB Project in the form of a comprehensive document both technical and non-technical, describing the solutions needed by the players in the market to utilize digital technology in the field of broadcasting. Since receipt of DAVIC (Digital Audio-Visual Council) as the central coordinating agency for the aspects of digital media convergence, DVB has been working together in terms of determining the technical and operational solutions in the development of various multimedia transmission media. Many of the DVB system is accepted as standard DAVIC. What was done by the DVB and DAVIC has expanded from merely broadcasting aspects towards the development of end-to-end interoperability. DVB system with MPEG-2 as the core video coding scheme, audio and data can be used to pack all kinds of formats used for multimedia purposes either in the form of text, images, graphics, and various types of moving image allows multimedia extensions added at the time of its appearance, but the noteworthy is that the key principal of the DVB is "broadcasting", so that the focus of the development of DVB is for commercial broadcasting market. System for DVB relatively new technology vendors, broadcasters and network providers. One of the strengths of the DVB technology lies in the fact that DVB allows transmission some sizzle data at high speed point-to-multipoint in a manner that is safe from the possibility of transmission errors. To enable the transmission of data in question includes the possibility of repetition of the same data transmission at a fixed time interval or not fixed, the DVB has developed a specification for data broadcasting .
Although the DVB project has reached the stage of maturity, but a variety of activities such as development continues, the development of solutions to membroadcast DVB High Definition Television (HDTV), Specification for Digital Satellite News Gathering (D-SNG), specifications for the interface that will connect the world with DVB networks PDH, ATM and SDH managed by telecom network operators, etc.. q
Dudy Effendi, IPStaff of the Directorate of Planning and Technology, PT. Telekomunikasi IndonesiaDepartment of Physics ITB alumni and the School of Information Science University of Pittsburgh.
At this time we can say that the entire broadcasting chain starting from the production process to distribution of digital television has been done, but the last chain of transmission process to end-users are still largely conducted in analog. DVB (Digital Video Broadcast) is one of the systems used to transmit digital TV broadcasting until the end-user.
DVB development effort as a global standard for digital television broadcasting either via satellite or terrestrial originated from the formation of the DVB Project in 1993. DVB Project consists of approximately 250 institutions from 30's, country and consists of broadcasters, manufacturers, network operators, regulatory bodies and academic institutions. DVB Project does not perform the function as a regulator but a work based on business and commercial aspects.
In a further development of the DVB Project has successfully developed a series of DVB specifications are not limited to video broadcasting, but also has penetrated down to the applications and multimedia services.
This paper will try to give a bit of an idea of the DVB standard. Given the breadth and depth of DVB standards, this article can not possibly cover everything. For those readers who are interested to know more about DVB can read a variety of references are available, including through http://www.dvb.org or http://www.etsi.org.Why DVB
DVB was developed based on the background of the importance of broadcasting system which is open (open system) which is supported by the ability of interoperability, flexibility and commercial aspects. As an open system, the DVB standard can be used by vendors to develop a variety of innovative services and value-added services that are compatible with each other DVB devices from other vendors. In addition, digital programs transmitted by the DVB specifications can be transferred from one transmission medium to another transmission medium with a cheap and easy. The approach taken by the DVB is to maximize the existing tools and common system available in the commercial market.
With digital technology, DVB can utilize bandwidth more efficiently. One satellite transponder that is usually only used for one analog TV program, using the DVB can be used to broadcast the 8 channel digital TV. Besides the addition of a TV channel capacity, the terrestrial transmission media can be obtained better image quality and even the media cable TV, DVB-C offers two-way interaction.
One of the fundamental decisions taken in setting standards is the selection of DVB MPEG-2 as "data containers". With these conceptions of the transmission of digital information can be flexibly without the need to provide limits what type of information will be stored in "data container" is. Selection of MPEG-2 compression system for coding and done because it proved that MPEG-2 capable of providing good quality according to available resources. From a commercial standpoint, the adoption of MPEG-2 which is the standard of existing and proven very beneficial because it allows DVB to concentrate on its efforts in finding ways to package the MPEG-2 data packets through different transmission including satellite, cable, SMATV, LMDS, as well as terrestrial. Chip-sets for coding and decoding MPEG-2 has been commercially available so that the price of the decoder in the commercial market priced. However because the MPEG-2 contained in the ISO document is generic, then the DVB Project developed a document that contains restrictions on the syntax and parameters of MPEG-2 and recommended values used in DVB applications.
DVB Service future will consist of various types of programs developed through a number of transmission channels. For IRD to ditune for certain services automatically through a user friendly navigation system then adds a navigation aid DVB DVB-SI (Service Information) which is an extension of the Programme Specific Information (PSI) from MPEG-2. Service information in DVB serves as the header of the MPEG container so that the receiver can find out what it takes to decode the signal.
In addition, MPEG-2 decoder enables a flexible design as improving the quality of the encoding. Any increase in performance due to the development of new encoding system will be automatically reflected on the image quality of the decoder.Transmission
DVB standards can be applied to a variety of media ranging from satellite transmission (DVB-S), cable (DVB-C) or terrestrial radio waves (DVB-T).Standard DVB-S DVB Project is the first product that allows the delivery of DVB signals via satellite. The document describes the various tools for purposes including the implementation of the modulation channel pengkodingan Binary Phase Shift Keying (BPSK).Channel coding and modulation systems DVB on cable systems (CATV) is described in the document DVB-C standard. This document is the basis for further development for the specification of [DVB-CS is used, (Satellite) Master Antenna TV (SMATV).DVB also regulates the use of terrestrial transmission media in DVB-T specification. Utilization of microwaves for transmission via DVB MMDS (Multichannel Microwave Distribution System) can be divided into two specifications: for the MMDS frequencies above 10 GHz (DVB-MS) using DVB-S specification, while for frequencies below 10 GHz (DVB-MC) is primarily based on DVB-C.Conditional Access System
CAS (Conditional Access System) is a subsystem that serves as control access to programs or services that are able to receive just service users who have received authorization. CAS consists of several blocks of which mechanism to scramble the program or service, Subscriber Management System (SMS), Subscriber Authorization System (SAS), etc.. SMS is essentially a data base containing customer information of a service, while the SAS function encrypt and send the code-words that enable the IRD to mendescrambler a program. DVB Project is not to make CAS as part of the DVB standard. However DVB Common Scrambling Algorithm developed a, namely tools for scrambling Transport Streams or Program Streams Elementary. DVB liberate the use of types of CAS in accordance with the needs of operators from multiple vendors DVB members that offer a competitive commercial product.In addition to the DVB standard allows the occurrence of cross-medium interoperabillity which allows various different delivery media can be interoperable with each other, one aspect of interoperability is that all DVB-compliant devices from different vendors can easily connect to each other in a broadcast chain.However integrated receiver decoders (IRD), which uses a different Conditional Access technology may not always be interoperable with each other. There are two approaches by DVB for the occurrence of interoperating between various different CAS, namely:
* SimulCrypt, in this case some programs to negotiate commercial providers to enable users who already have a proprietary CAS IRD with embedded in them can enjoy the different services of the CAS due to supply the necessary proprietary information.
* Multicrypt, CAS technologies can be on one platform so that the same IRD can receive dibroadcast programs simultaneously from several different programs CASnya.
Interactivity
DVB system has the ability to utilize the return path between the IRD and the Service Provider via the module's Subscriber Management System. For the purposes of this return path is required modem and telephone or cable TV networks return path or even a satellite uplink. Return this path can be used to send signals back from the user as the application televoting, playing games, tele-shopping, and tele-banking, and also to send commands browsing on an internet website. Despite the limited bandwidth for the return path is not suitable for sending video images to move from house to broadcasters, the next stage of development is expected to allow for this to happen. In addition, DVB also offers a kind of interactivity without requiring a return path that is providing a variety of program choices according to user choice.
Many services are offered in DVB will require some form of interaction between the user and the program provider or network operator. This interaction can be a bit of a command transmission but may also require fairly intensive interaction as in communication via the Internet. Interactive TV identified as one of the important keys that will control the digital transmission system in the future. Various members of the DVB has developed a comprehensive plan for the introduction of interactive TV since 1997. The occurrence of convergence in this area allow for a turning point in the future world of broadcasting.Various specifications of the DVB return channel has been published by ETSI including the DVB-RCC (Cable) and DVB-RCT (Telephone or ISDN), which is the complement of the DVB-NIP (Network Independent Protocols) are based on MPEG-2 DSM-CC (Digital Storage Media-Command and Control).DVB allows the occurrence of these interactions and specify two types of tools for that purpose. The first is interatif tools that are network-independent which can be regarded as a layer 2 or three in the protocol stack of ISO / OSI protocol derived from the Digital Storage Media Command Control (DSM-CC) of MPEG.The second group is associated with a lower layer (layer 1 or two) of the OSI model / ISO in the form of interactive tools that are network-dependent. There are several specifications that have been developed, among others, through the Public Switched Telephone Networks (PSTN) and Integrated Services Digital Networks (ISDN). It also developed a comprehensive solution for interaction through a network of CATV, Hybrid Fibre Coaxial (HFC), Terrestrial Systems, Satellite Master Antenna Television Systems (SMATV), LDMS, VSAT, DECT, and GSM.Interoperability
DVB systems are designed to make the most common elements in the commercial market. This allows starndard used in distributing the signal without having to perform complicated processes in the process of decoding and re-coding from one medium to another. Interoperability between standards allows manufacturers to achieve economies of scale. Most of the same element used in all sisytem. The following diagram illustrates a common sequence found on the DVB IRD.Development of DVB
Results achieved by the DVB Project in the form of a comprehensive document both technical and non-technical, describing the solutions needed by the players in the market to utilize digital technology in the field of broadcasting. Since receipt of DAVIC (Digital Audio-Visual Council) as the central coordinating agency for the aspects of digital media convergence, DVB has been working together in terms of determining the technical and operational solutions in the development of various multimedia transmission media. Many of the DVB system is accepted as standard DAVIC. What was done by the DVB and DAVIC has expanded from merely broadcasting aspects towards the development of end-to-end interoperability. DVB system with MPEG-2 as the core video coding scheme, audio and data can be used to pack all kinds of formats used for multimedia purposes either in the form of text, images, graphics, and various types of moving image allows multimedia extensions added at the time of its appearance, but the noteworthy is that the key principal of the DVB is "broadcasting", so that the focus of the development of DVB is for commercial broadcasting market. System for DVB relatively new technology vendors, broadcasters and network providers. One of the strengths of the DVB technology lies in the fact that DVB allows transmission some sizzle data at high speed point-to-multipoint in a manner that is safe from the possibility of transmission errors. To enable the transmission of data in question includes the possibility of repetition of the same data transmission at a fixed time interval or not fixed, the DVB has developed a specification for data broadcasting .
Although the DVB project has reached the stage of maturity, but a variety of activities such as development continues, the development of solutions to membroadcast DVB High Definition Television (HDTV), Specification for Digital Satellite News Gathering (D-SNG), specifications for the interface that will connect the world with DVB networks PDH, ATM and SDH managed by telecom network operators, etc.. q
Dudy Effendi, IPStaff of the Directorate of Planning and Technology, PT. Telekomunikasi IndonesiaDepartment of Physics ITB alumni and the School of Information Science University of Pittsburgh.
Thursday, April 14, 2011
VGA pin
VGA 9 pin :
pin 1 : Video Red
pin 2 : Video Green
pin 3 : Video Blue
pin 4 : Horizontal sync
pin 5 : Vertical sync
pin 6 : Red GND
pin 7 : Green GND
pin 8 : Blue GND
pin 9 : Sync GND
VGA 15 pin
pin 1 : Video Red
pin 2 : Video Green
pin 3 : Video Blue
pin 13 : Horizontal Sync
pin 14 : Vertical Sync
pin 6 : Red GND
pin 7 : Green GND
pin 8 : Blue GND
pin 10 + 11 : Sync GND
pin 1 : Video Red
pin 2 : Video Green
pin 3 : Video Blue
pin 4 : Horizontal sync
pin 5 : Vertical sync
pin 6 : Red GND
pin 7 : Green GND
pin 8 : Blue GND
pin 9 : Sync GND
VGA 15 pin
pin 1 : Video Red
pin 2 : Video Green
pin 3 : Video Blue
pin 13 : Horizontal Sync
pin 14 : Vertical Sync
pin 6 : Red GND
pin 7 : Green GND
pin 8 : Blue GND
pin 10 + 11 : Sync GND
Friday, April 8, 2011
SHARP TV Repair
TV Feature sharp in protectionist conditions are as follows: if the tv in turn led indicator is red then green and hold a few seconds and then red again.To repair damage Sharp TV with this condition (Protec), bang Zic (http://zicelectronic.blogspot.com) gives the solution as follows:
First you have to clean first with a brush or brush mainboardnya hewn around 2cm, to see and ensure the solder point which is not good, as distinguished loose solder point will be moved and you can see with liquid jelas.Gunakan thinner high-gloss (good quality and fast dry) to clean the stain on mainboard.Setelah dirty or clean, check all the solder points in part: Vertikal-Regulator/power supply-Flyback.blok are most often occurs because of heat damage to the solder point that ditimbulkannya.terutama solderan check in the feet IC vertical and resistornya.Replace the IC vertical if you believe the damaged or also on the mark with resistor color change vertikal.kerjakan carefully.Try to turn on the TV and watch, if it still does not want to start normally, follow these steps:If the flame of a red LED to the green and stop being a yellow, damage occurs to the IC memory (24c04-24c16), replace with a distinguished baru.Setting return parameters used in the service menu. If the red LED continues to die, the damage occurred on the main IC (TDA 938psxxx) or loss of voltage on the regulator 3.3volt, check the power supply.If a green or flashing red, there is an error in the IC memory.ika green LED for 5-10 seconds and re-red, there is a failure on the horizontal section, check the flyback (unplug and measuring with a multimeter scale of 10k in the feet and legs bound ground TR.output horizontal collector, if it moves even a little mean already short flyback . Also check the voltage of 180V to block RGB, usually involves damage to the limiting resistor.Conclusion:SHARP TV that uses a main IC TDA series 938PSxxx, general and frequent damage to: SOLDERAN THE LESS GOOD, VERTICAL IC, MEMORY IC, flyback and REGULATOR.These tips have my practice at home on TV Sharp 14 "Universe and managed successfully. Additional to this model if the Sharp TV vertical images are not normal (blank top and bottom about 10 cm) try to short pins 6 and 7 of IC (service mode) and resetting said vertical bang zic.For the layman who wants to try at home Be careful to stun! remember the TV still stun the rest (1-5 KV) electrical outlet even though the TV is off ..
Http://coretanaba.blogspot.com
First you have to clean first with a brush or brush mainboardnya hewn around 2cm, to see and ensure the solder point which is not good, as distinguished loose solder point will be moved and you can see with liquid jelas.Gunakan thinner high-gloss (good quality and fast dry) to clean the stain on mainboard.Setelah dirty or clean, check all the solder points in part: Vertikal-Regulator/power supply-Flyback.blok are most often occurs because of heat damage to the solder point that ditimbulkannya.terutama solderan check in the feet IC vertical and resistornya.Replace the IC vertical if you believe the damaged or also on the mark with resistor color change vertikal.kerjakan carefully.Try to turn on the TV and watch, if it still does not want to start normally, follow these steps:If the flame of a red LED to the green and stop being a yellow, damage occurs to the IC memory (24c04-24c16), replace with a distinguished baru.Setting return parameters used in the service menu. If the red LED continues to die, the damage occurred on the main IC (TDA 938psxxx) or loss of voltage on the regulator 3.3volt, check the power supply.If a green or flashing red, there is an error in the IC memory.ika green LED for 5-10 seconds and re-red, there is a failure on the horizontal section, check the flyback (unplug and measuring with a multimeter scale of 10k in the feet and legs bound ground TR.output horizontal collector, if it moves even a little mean already short flyback . Also check the voltage of 180V to block RGB, usually involves damage to the limiting resistor.Conclusion:SHARP TV that uses a main IC TDA series 938PSxxx, general and frequent damage to: SOLDERAN THE LESS GOOD, VERTICAL IC, MEMORY IC, flyback and REGULATOR.These tips have my practice at home on TV Sharp 14 "Universe and managed successfully. Additional to this model if the Sharp TV vertical images are not normal (blank top and bottom about 10 cm) try to short pins 6 and 7 of IC (service mode) and resetting said vertical bang zic.For the layman who wants to try at home Be careful to stun! remember the TV still stun the rest (1-5 KV) electrical outlet even though the TV is off ..
Http://coretanaba.blogspot.com
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