1. Broadband network digital TV, also known as IPTV or BTV, or interactive network TV, is a kind of broadband Internet, multimedia and other technologies integrated to provide home users with a variety of interactive services including digital TV New technology. It can well adapt to the rapid development trend of today's networks and make full and effective use of existing broadband network resources.
In the current commercial broadband network, users can enjoy IPTV services in two ways at home:
(1) Computer: In this way, users can listen to radio programs or enjoy music while surfing the Internet through a computer, or they can watch video programs such as TV or movies directly on the computer.
(2) Network set-top box (STB) + ordinary TV. A new network set-top box (STB) is added to the user's home. The set-top box provides an AV interface, which is directly connected to an ordinary TV. The user can choose to watch broadband network TV programs by controlling the set-top box.
Users can not only enjoy traditional Internet data services and online games through PC, but also can watch broadband video programs such as TV and movies on ordinary TV through special conversion equipment STB.
2. Key technologies in IPTV
The essence of IPTV application is the transmission and distribution of streaming media on broadband networks. Therefore, the application and development of IPTV are the result of the simultaneous application of the following key technologies.
(1) Broadband access technology: The fast-developing broadband access technology provides a path for the transmission of media streams.
Among the broadband access technologies currently in use, DSL is a technology that can provide broadband data services through ordinary telephone lines. The commonly used ADSL (Asymmetrical Digital Subscriber Line, Asymmetric Digital Subscriber Line) technology can provide a bandwidth of 8M downstream. The ADSL standard has been defined in detail in the ITU-T G.992.1. With the rapid development of technology, ITU-T introduced two new-generation ADSL standards in June 2002 and January 2003: ADSL2 (G.992.3) and ADSL2+ (G.992.5). The maximum uplink and downlink rate supported by ADSL2 is 1.3M/15M, while the maximum uplink and downlink rate supported by ADSL2+ can reach 1.3M/24M. Higher bandwidth makes it possible to transmit a large amount of streaming media.
(2) IP multicast routing technology: powerful support for streaming media distribution.
IP multicast routing technology realizes point-to-multipoint high-efficiency data transmission in an IP network. It can effectively save network bandwidth and reduce network load. Multicast is a network technology that allows one or more senders (multicast sources) to send the same data packet to multiple receivers at the same time. It is a network technology that can double without increasing the backbone network load. An effective solution to increase the number of service users, and therefore become the preferred solution for current high-traffic video services. In the application of IPTV, the use of IP multicast routing technology can effectively distribute media streams and reduce network traffic. At present, the access device realizes the user's on-demand join and leave functions through the IGMPProxy function, thus realizing the on-demand distribution of media streams. And it reduces the excessive bandwidth occupation of multicast. With the application of IP multicast technology to integrated access devices, most devices support IGMPsnooping and IGMPProxy functions.
IGMPsnooping is a basic solution to the broadcast flooding of IP multicast on Layer 2 network equipment. By listening to the IGMP protocol messages between the client and the multicast routing device on the Layer 2 network device, obtain the user list information of the multicast service, and forward the multicast data according to the current user information, so as to suppress the Layer 2 multicast The purpose of flooding.
IGMPproxy provides a complete solution for the multicast service of Layer 2 devices through the proxy mechanism. The Layer 2 network equipment of IGMPproxy is implemented. It assumes the role of Server on the user side, and periodically queries user information, and assumes the role of Client on the network routing side, and sends current user information to the network when needed. It can not only achieve the purpose of suppressing the flooding of Layer 2 multicast, but also effectively obtain and control the
control user information, and at the same time play a certain role in reducing network-side protocol messages to reduce network load.
(3) Digital coding technology: technical support for transmission reliability.
The transmission of audio/video and other multimedia information on the network involves reliable real-time transmission of streaming media. Therefore, digital coding and decoding technology is one of the key technologies of IPTV. At present, the applicable coding standards under the broadband network environment are: MPEG-4, AC-1 and H.264, etc. MPEG-4 is the ISO/IEC standard, formulated by MPEG, and currently uses MPEG-4Part2; H.264 is a video coding standard developed by ITU-T’s VCEG and ISO/IEC’s MPEG Joint Video Group JVT. T's H.264 is also ISO/IEC's MPEG-4 Part10; AC-1 is Microsoft's video coding standard, which is the name of the coding standard adopted by WMV9 after submitting materials to the Codec Standards Organization.
The continuous improvement of network bandwidth, such as the application of ADSL2 or ADSL2+ technology, can increase the user's uplink and downlink rate to 1.3M/24M. And if the ITU-T H.264 or WMV9 is used to encode the media stream, the 800K bit rate can already provide a quality close to that of DVD, which fully meets the requirements of current users. Therefore, the combination of the two guarantees the transmission reliability of the IPTV media stream. Although there is no corresponding national standard that specifies the digital coding technology adopted by IPTV, no matter it is MPEG-4, H.264, or WMV9 coding technology, it has reached the requirements of IPTV applications. If combined with the new broadband access technology, any encoded streaming video program can be transmitted in real time.
3, summary
The emergence of IPTV as a new application is not simply an application on broadband networks. Rather, it is produced under the development of network transmission technology, IP multicast routing technology, and streaming media coding technology, and is the result of the powerful combination and application of these key technologies.
IPTV will inject new vitality into broadband operators and program providers. In addition to providing users with communication and information services, broadband operators can also provide users with rich and personalized TV programs through IPTV, which is of great help to attract users and improve user satisfaction.
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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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