1 Introduction
The International Organization for Standardization (ISO) has developed a new standard MPEG-7 based on the formulation of MPEG-1, MPEG-2 and MPEG-4 standards. The official name of the standard is "Multimedia Content DescripTIon Interface" (MulTImedia Content DescripTIon Interface). ), its goal is to produce a standard for describing multimedia content data to meet the needs of real-time, non-real-time, and push-pull applications. It is different from waveform-based and compression-based representations such as MPEG-1 and MPEG-2, and Different from the object-based representation such as MPEG-4, it will carry out standardized description of various types of multimedia information, and link the description with the described content to realize fast and effective search.
2. Goals of MPEG-7
1) Support multiple audio and visual descriptions
description includes free text, n-dimensional space-time structure, statistical information, objective attributes, subjective attributes, production attributes and combined information. For visual information, the description may include colors, visual objects, textures, sketches, shapes, volumes, spatial relationships, motion and deformation, etc. For audio information, the description may include pitch, mode, speed of sound, changes in speed of sound, etc.
2) According to the abstract level of information, provide a method of describing multimedia materials in order to express the needs of users at different levels for information.
3) Support the flexibility of data management, the globalization and interoperability of data resources.
3. MPEG-7 components
The main elements of MPEG-7 include the following.
1) Description tool, including a set of descriptors D (Descriptor) and description scheme DS (DescripTIon Schemes). Descriptor refers to the syntax or grammar used to define and express a certain aspect of an entity. The expression entity is composed of feature identifiers (such as color) and data types (such as character strings). The data type can be "composite", it can be composed of a combination of several data types, or it can be "describe" a feature by several Ds. The description scheme is composed of one or more D and DS, and DS specifies the structure and grammar of their relationship.
2) Description Definition Language DDL (DescripTIon Definition Language) is used to specify a language for describing the program. It is a model language, a representation of the results of audio and video data modeling. DDL specifies the description tools of MPEG, including descriptors and description schemes, and provides rules for constructing descriptors into description schemes. DDL also allows the definition of extended DS in special applications. The description tool is instantiated through DDL and described in text format (XML).
3) System tools used to support multiple descriptions, synchronization issues, transmission mechanisms, file formats, etc.
4. MPEG-7 attribute description tool
The MPEG-7 standard provides a series of attribute description tools for unified management of attributes. The attribute description tools are mostly used when more than one media is described (such as audio and video). These description tools are divided into five categories according to their functions: content description, content management, content organization, navigation and access, and user interaction.
1) Basic Elements
Basic data types provide a set of extended data types and mathematics types that are helpful for describing AV (Audio-Visual) content, such as matrices and vectors. Basic data types can also construct connected media files, locate content, describe time, place, and people. It is these basic elements that form the basis for defining the MPEG-7 description scheme through the DS specification.
2) Content Description
The purpose of content description is to describe the perceptible information content to characterize the perceptible content information. The content description includes two aspects: structure and semantics. The structure tool describes the temporal and spatial structure information of AV content by dividing fragments, frames, static and dynamic regions. Semantic tools describe the real world reflected in AV content through objects, events, abstract concepts and relationships. Structural tools and semantic tools work together through links to jointly complete the description of the content.
3) Content Management
Content management is used to process information related to multimedia document creation, media ownership and encoding, that is, information that cannot be abstracted.
4) Content Organization
Content organization provides a method to describe the analysis and classification of multimedia data, which can be used to describe the attributes of a group of objects.
5) Navigation and Access
Navigation and access tools are used to define a series of abstracts of audio and video content, decompose and transform information, and make browsing and obtaining AV content more convenient. It contains three parts: overview, decomposition and transformation.
6) User Interaction
It describes user preferences and usage information, which makes access to the media more personalized and provides convenience for users. For example, the priority of media can be defined according to the user's hobby, so that the user can find the most suitable information as soon as possible.
5. Application areas of MPEG-7
People require high-efficiency access, interactive operation and display of multimedia information in daily life. These are the two types of applications of MPEG-7 "Pull" and "Push". These two types of applications are closely related to social politics and economics, and are indispensable in professional fields such as education, film and television, and in different occasions of consumer applications.
1) Pull type
The purpose of the MPEG-7 standard is to define a specification to make the query of AV data as convenient as the current text query. Although its recognized application of multimedia content description is far more than "acquisition", it still remains as many original MPEG-7 applications. These "acquisition", or "Pull" type applications involve databases, multimedia information files, and network-based Internet models (users request information from the server).
The following are some applications of the "Pull" type.
(1) Commercial music applications (karaoke and music sales)
When the user sees a song from the TV station, only need to sing a few paragraphs, the entire song can be "searched" from the database without much effort; after charging an appropriate fee, the entire song can be downloaded to the user's computer on.
(2) Sound Effect Library
Artists and sound designers can specify a sound effect type, and then choose the appropriate need from the many variations of this sound source. For example, providing a prototype sound, specifying detailed features, or using onomatopoeia, a deformed way of "searching" through humming, to produce the type of abstract sound he wants to find.
(3) Historical database
People can pass some specific keywords ("The People's Republic of China is established!"), key events (WTO), speaker (Bill Gates), location (capital), date (September 11, 2001), or It is any combination of the above aspects to "search" an audio and video record or other related events.
(4) "Search" movie scenes through reminiscent auditory events
In people's memory world, many visual events are unforgettable. The most obvious example is to use a specific "description" to refer to movie and TV scenes or dialogue, sound, etc., and find a movie in this way.
2) Push type
"Push" and "Pull" type applications are the opposite. "Push" type applications are more like broadcast methods and the new web broadcasts. The "Pull" model is from index to "search", and the "Push" model is from selection to "filter". These two types of applications have completely different requirements. Usually "Pull" deals with the "description" of static information stored in the database, while "Push" deals with the "description" of changing dynamic information. The requirement of "Push" or "filtering" is to provide multimedia information that users only want to watch or listen to.
As in digital systems (including data broadcasting), MPEG-7 description can help users select programs and various types of data broadcasting information for viewing at the time or later, as well as recording and storage. In the environment of a personalized broadcast system, the data provided to users can be "filtered" from the data broadcast according to their respective types, and the generation of types can be automatic (such as based on location, age, gender, or previous selection behavior Etc.), it can also be semi-automatic (such as based on preset interests, etc.).
6. Concluding remarks
The emergence of MPEG-7 is an inevitable product of the transition from the text information era to the multimedia information era. In the future multimedia information retrieval services, MPEG-7 will surely play a leading role. At present, many research institutions have begun to conduct research on the key technologies among them, and have achieved certain results, but there is still a considerable gap between practical applications. With the rapid development of MPEG standards and network systems, the application of MPEG-7 will also flourish, providing more convenience for our study and life.
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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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