1. NTSC
NTSC is the abbreviation of National Television Standards Committee, which means "(United States) National Television Standards Committee".
NTSC is responsible for developing a set of American standard television broadcast transmission and reception protocols. In addition, there are two sets of standards: Progressive Inverted Image (PAL) and Sequential and Color Saving Television System (SECAM), which are used in other countries in the world. The NTSC standard has not changed much since they were created, except for the addition of new parameters of the color signal. NTSC signals are not directly compatible with computer systems.
There are 525 horizontal lines in each frame of the NTSC TV full-screen image. The lines are arranged from left to right and top to bottom. Every other line is jumping. So each complete frame needs to scan the screen twice: the first scan is an odd line, and the other scan is an even line. Each half-frame screen scan takes about 1/60 second; the full frame scan takes 1/30 second. This interlaced scanning system is also called interlacing (also means interlacing). The adapter can convert the NTSC signal into a digital signal that the computer can recognize. On the contrary, there is a kind of equipment that can convert computer video to NTSC signal, and can use the TV receiver as a computer monitor. However, since the resolution of a general-purpose TV receiver is lower than that of an ordinary monitor, no matter how large the TV screen is, it cannot adapt to all computer programs.
In recent years, the industry urgently needs to adopt a new set of TV standards. One proposed protocol is high-definition television (HDTV). The HDTV standard can be completely directly compatible with computer systems. However, there are still some design problems that have not been resolved. Some industry experts worry that such compatibility will seriously increase the cost of general-purpose TVs.
2. HDCP
HDCP (High-bandwidth Digital Content Protection): High-bandwidth digital content protection technology. The era of HDTV (High Definition Television) is approaching. In order to adapt to the high bandwidth of HDTV, HDMI has appeared. HDMI is a high-definition digital interface standard, it can provide a high bandwidth, lossless transmission of digital video and audio signals. In order to ensure that the high-definition signals transmitted by HDMI or DVI will not be illegally recorded, HDCP technology has emerged. The HDCP technical specification is led by Intel. When users make illegal copies, the technology will interfere and reduce the quality of the copied images, thereby protecting the content.
The data content protected by HDCP technology on the computer platform will be driven by the COPP (Certified Output Protection Protocol) in the operating system to verify the graphics card first. Only legal graphics cards can achieve content output, and then the key of the display device must be authenticated. Only devices that meet the HDCP requirements can finally display the content transmitted by the graphics card. During HDCP transmission, both the sender and receiver store a set of available keys. These keys are stored secretly. Both the sender and receiver perform encryption and decryption operations based on the keys. A special feature must be added to such operations. Value KSV (Video Encryption Key). At the same time, each device of HDCP will have a unique KSV serial number, and the cryptographic processing unit of the sender and receiver will check each other's KSV value to ensure that the connection is legal. The HDCP encryption process will process each pixel, making the picture irregular and unrecognizable. Only after confirming the synchronization can the sender and receiver perform reverse processing to complete data restoration. In the decryption process, the HDCP system will confirm the connection every 2 seconds, and at the same time, perform the synchronization identification code of the sender and the receiver every 128 frames to ensure the synchronization of the connection. In order to deal with the situation of key leakage, HDCP has specially established a "revocation key" mechanism. The key set KSV value of each device is unique. The HDCP system will compare and look up the KSV value in the revocation list after receiving the KSV value. The KSV that appears in the list will be regarded as illegal, causing the authentication process to fail. The revocation key list here will be included in the multimedia data corresponding to HDCP and will be updated automatically.
At present, high-definition video is becoming more and more popular, which can be seen from the radio and television programs in developed countries, the video resources in the Internet, and the output equipment of large-screen terminals. Because high-definition content is a digital signal, it is easy to copy and store without distortion. It is no wonder that content providers represented by film producers/distributors strongly support HDCP technology and strive to provide high-definition TV/movie and interactive network formats. Before the large-scale emergence, this content protection function was deployed on all personal terminal devices.
As mentioned earlier, HDCP requires the joint support of software and hardware, and all devices involved in content transmission are indispensable. Microsoft will integrate the "Protective Content Output Management Protocol (OPM)" in the new-generation operating system Vista to confirm the performance of the display device and HDCP support before outputting content. At the same time, as the main carrier of high-definition video, Blu-ray and HD-DVD will also implement the HDCP standard.
The video source playback and display terminal equipment will realize the secondary encoding/decoding of the signal through the built-in conversion chip. The products involved include display cards, DVD players, TVs, monitors, projectors, etc. HDCP is realized through the digital interface DVI-D or the new HDMI, the latter of which is more commonly used and has both audio/video transmission, and has almost become a sign of HDCP support. However, HDMI+HDCP currently seems to have a high reputation in the field of home appliances, and it has almost become the standard configuration of new products, far ahead of actual applications. However, due to future compatibility and pressure from upstream protocol makers, equipment manufacturers dare not neglect. In the PC field, although Microsoft has been "warning" that Vista can only support HDCP protocol display cards and corresponding drivers, the repeated ticket skips have given accessory manufacturers more reasons.
Frankly speaking, although HDCP has received widespread attention in the industry and its popularization is a foregone conclusion, from the perspective of HDCP principles, the protection process is too simple, and protection is only achieved in the external transmission process. This is quite limited in the era when computers are widely used. , This not only makes people feel that the makers are suspected of defrauding high licensing fees. Once the digital signal itself is read into the computer in a binary format, the copying process can still be realized. For example, it can be separated by the RIP method similar to the current DVD video disc.
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How far(long) the transmitter cover?
The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far.
EXAMPLE 5W FM Transmitter use in the city and hometown:
I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile).
I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile).
I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft).
Below are the approximate range of different power FM Transmitters. ( The range is diameter )
0.1W ~ 5W FM Transmitter ：100M ~1KM
5W ~15W FM Ttransmitter : 1KM ~ 3KM
15W ~ 80W FM Transmitter : 3KM ~10KM
80W ~500W FM Transmitter : 10KM ~30KM
500W ~1000W FM Transmitter : 30KM ~ 50KM
1KW ~ 2KW FM Transmitter : 50KM ~100KM
2KW ~5KW FM Transmitter : 100KM ~150KM
5KW ~10KW FM Transmitter : 150KM ~200KM
How to contact us for the transmitter?
Call me +8618078869184 OR
Email me [email protected]
1.How far you want to cover in diameter ?
2.How tall of you tower ?
3.Where are you from ?
And we will give you more professional advice.
About Us
FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.
We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.
Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.
We are using advanced technology products for all the systems, because we know the high reliability and high performance are so important for the system and solution . At the same time we also have to make sure our products system with a very reasonable price.
We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .
FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected]
Our Factory
We have modernization of the factory . You are welcome to visit our factory when you come to China.
At present , there are already 1095 customers around the world visited our Guangzhou Tianhe office . If you come to China , you are welcome to visit us .
At Fair
This is our participation in 2012 Global Sources Hong Kong Electronics Fair . Customers from all over the world finally have a chance to get together.
Where is Fmuser ?
You can search this numbers " 23.127460034623816,113.33224654197693 " in google map , then you can find our fmuser office .
FMUSER Guangzhou office is in Tianhe District which is the center of the Canton . Very near to the Canton Fair , guangzhou railway station, xiaobei road and dashatou , only need 10 minutes if take TAXI . Welcome friends around the world to visit and negotiate .
Contact: Sky Blue
Cellphone: +8618078869184
WhatsApp: +8618078869184
Wechat: +8618078869184
E-mail: [email protected]
QQ: 727926717
Skype: sky198710021
Address: No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China Zip:510620
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English: We accept all payments , such as PayPal, Credit Card, Western Union, Alipay, Money Bookers, T/T, LC, DP, DA, OA, Payoneer, If you have any question , please contact me [email protected] or WhatsApp +8618078869184
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PayPal.  www.paypal.com
We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet .
Every of our item list page bottom on top have a paypal logo to pay.
Credit Card.If you do not have paypal,but you have credit card,you also can click the Yellow PayPal button to pay with your credit card.
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But if you have not a credit card and not have a paypal account or difficult to got a paypal accout ,You can use the following:
Western Union.  www.westernunion.com
Pay by Western Union to me :
First name/Given name: Yingfeng
Last name/Surname/ Family name: Zhang
Full name: Yingfeng Zhang
Country: China
City: Guangzhou
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T/T . Pay by T/T (wire transfer/ Telegraphic Transfer/ Bank Transfer)
First BANK INFORMATION (COMPANY ACCOUNT):
SWIFT BIC: BKCHHKHHXXX
Bank name: BANK OF CHINA (HONG KONG) LIMITED, HONG KONG
Bank Address: BANK OF CHINA TOWER, 1 GARDEN ROAD, CENTRAL, HONG KONG
BANK CODE: 012
Account Name : FMUSER INTERNATIONAL GROUP LIMITED
Account NO. : 012-676-2-007855-0
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Second BANK INFORMATION (COMPANY ACCOUNT):
Beneficiary: Fmuser International Group Inc
Account Number: 44050158090900000337
Beneficiary's Bank: China Construction Bank Guangdong Branch
SWIFT Code: PCBCCNBJGDX
Address: NO.553 Tianhe Road, Guangzhou, Guangdong,Tianhe District, China
**Note: When you transfer money to our bank account, please DO NOT write anything in the remark area, otherwise we won't be able to receive the payment due to government policy on international trade business.
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* It will be sent in 1-2 working days when payment clear.
* We will send it to your paypal address. If you want to change address, please send your correct address and phone number to my email [email protected]
* If the packages is below 2kg,we will be shipped via post airmail, it will take about 15-25days to your hand.
If the package is more than 2kg,we will ship via EMS , DHL , UPS, Fedex fast express delivery,it will take about 7~15days to your hand.
If the package more than 100kg , we will send via DHL or air freight. It will take about 3~7days to your hand.
All the packages are form China guangzhou.
* Package will be sent as a "gift" and declear as less as possible,buyer don't need to pay for "TAX".
* After ship, we will send you an E-mail and give you the tracking number.
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For Warranty .
Contact US--->>Return the item to us--->>Receive and send another replace .
Name: Liu xiaoxia
Address: 305Fang HuiLanGe HuangPuDaDaoXi 273Hao TianHeQu Guangzhou China.
ZIP:510620
Phone: +8618078869184
Please return to this address and write your paypal address,name,problem on note: |
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