Two proposals received from Doordarshan for consideration by the meeting of sg-6 are attached for comments
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- Results of measurement carried out on DRM in MW and SW bands
- DRM mode: A/64/16/0.6/S
- DRM mode: B/16/4/0.5/L
- DRM RMS power: 500W
Element 17: DurationName: Duration Definition: The actual duration of the Resource in HH/MM/SS Comment: It should be similar to DC Education Standard Qualifier. Typically it can be HH/MM/SS format Element 18: AgentName: Agent Definition: An entity responsible for marketing to the content of the resource. Examples of an Agent include a person, an organization, or a service. Typically, a single name of an Agent should be used to indicate the entity. 4 Should such information be supplemented with further information in the form of Metadata when those programmes are digitally archived? For Archiving purposes, we can use two additional elements as follows: 1.Original recording format: This may be helpful in selecting the correct digital format along with necessary filters, if we know the original recording format of the archival data. 2.Date of Last Broadcast. 5 How to format, store & transfer metadata in production and post-production environments? Metadata can be attached to Multimedia by using the wrapper file concept. Metadata information should be included in the header of the wrapper file. The wrapper file should have the following structure: 
The metadata should always form the integral part of the content file after initial production. The wrapper file including metadata information should be transferred from production stage to post-production stage where the existing metadata may be read and if required, it may be modified & updated. 6 Possibility of optimal data model to uniformly describe and define metadata structure, its component Multiple data Models/formats are available for Metadata, such as, RIFF-BWF, EBU-P/Meta, METS-XML etc. However, it is suggested that the following fields should be essential part of any format finalized for Metadata. The length/size of these fields may be decided as per the maximum Metadata Size possible in the adopted Metadata Format. 6.1 Format description This metadata should define the format of Digital Audio/Video file so that it can be played by the player Module using right plugins & with proper settings. For Audio portion, the various dimensions of the format field can be: Number of channels Sampling Rate Quantization Bits Whether Linear or Compressed? If compressed, Compression Format If compressed, Bit rate Data Block size 6.2 Ownership & distribution rights This Metadata should contain a rights management statement for the multimedia resource. A URL can be used to point to an Internet site that clearly states ownership & distribution rights on multi-media content. Alternatively, Type of access permitted e.g. Unrestricted, Pay-per-view, Copy / edit allowed etc can be used. The following Metadata fields are suggested. Publisher / Production Company- An entity responsible for creating/making the content available Rights- Information about the rights held in and over the content. 6.3 Production Date This Metadata should contain information regarding date of production of the content. 6.4 Intellectual information Information on the persons having Intellectual rights over the multi-media content shall be contained by this Metadata information. The following five Intellectual information fields should suffice the requirement. Producer/Creator Writer/Lyrics /Contributor Composer Artist/Singer Actor Only the owner should be able to modify the information in these fields. 6.5 General Information The Metadata fields related to General information can be following: Title Title will be the name by which the resource shall be formally known as. Theme / Subject The field shall describe the topic of the content of the resource. Typically, a Theme will be expressed as keywords, key phrases or classification codes that describe a topic of the resource. Language This field shall intimate the main language of the resource. International standards for Language codes can be used here. Content Type This field shall describe the type of content e.g. Song, Interview, Drama, News, Drama serial. The field may be expressed as pre-defined classification code. e) Description The field shall describe mood/genre of the content e.g. sad, romantic, Patriotic, Spiritual, Comedy etc. The field may be expressed as pre-defined classification code. f) Country/Source Name of the country where origin of resource lies or a Reference to a content from which the present content is derived. h) Duration The actual duration of the Resource in HH/MM/SS i) Agent An entity responsible for marketing of the content. j) Media No. / Code No. /Identifier This field may be used to identify the resource by means of a string or number conforming to a formal identification system. Example of formal identification systems includes the Uniform Resource Identifier (URI) or Uniform Resource Locator (URL). 7. Is it possible to recommend a subset of information that should be delivered in the form of Metadata when digitally recorded sound and television programme are exchanged internationally? The metadata elements recommended above are considered essential. At the most, the following four elements can be deleted in case of international exchange: Element 4 - Description Element 6 - Type/Category Element 12- Date Element 18- Agent 8. Procedure to be adopted in Production and Postproduction to ensure that appropriate metadata is created and maintained: Preparation of Metadata should start at the pre-production stage itself. Content’s General & intellectual information is finalized in the pre-production stage. A tool can be used at this stage to record this information in Digital format so that it can be transferred /attached to Multimedia content at Production/Post production stage. Metadata information related to Format description should be automatically picked up by the Recording Module/application depending upon the selections made by Production personnel at the beginning of Production activity. Recording Module/application should also ensure that General and Intellectual information is entered by Production personnel before the end of Production activity. This could be done either by reading directly from the File containing Metadata produced at Pre-Production stage or by manually entering the data. Application software used during production must ensure that during initial production at least essential metadata is entered. This can be done by prompting to enter the data in the essential fields at the time of saving the file first time. At least, intellectual information fields should be entered in this way. This will ensure that audio content will always carry at least limited metadata. Post Production Module should read the metadata from the file & should allow modifying as well as updating the same. Post Production module should be such that it should not disturb the already entered Metadata. Metadata should survive the course of any processing on multimedia content during post-production phase. It should also prompt for entering the data in essential fields, if any such fields are still blank. PROPOSAL 2
Received: Subject: Questions ITU-R 52-1/6, 60/6, 64-1/6 and 108/6
A collaborative project on DRM in MW and SW bands was undertaken in New Delhi from 7th to 12 May 2007. The project partners were All India Radio (AIR), Asia-Pacific Broadcasting Union (ABU) and Digital Radio Mondiale (DRM). DRM consortium and its members Thomson Broadcast Multimedia, Hitachi Electric Kokusai and University of Basque (Spain) actively participated. The following studies were undertaken during the course of the project: Evaluation of new technology of Single Channel Simulcast (SCS) which enables simultaneous transmission of Analog and DRM Digital MW sound signals using only one transmission infrastructure. Transmission of stereo service using 18 KHz band width in MW band using DRM. Assessment of reception for local coverage using DRM transmission in 26 MHz band. Evaluation of reception in NVIS mode (Tropical broadcasting) in 3 MHz band. 2. Measuring Set-Up Research Department of AIR and Doordarshan provided two mobile vans equipped with measuring set up for various propagation measurements under static and mobile conditions in and around Delhi. Each vehicle was fitted with rooftop receiving antennas, heavy duty batteries, inverters for supplying DC power to professional DRM receiver, laptops and field strength meters etc. A professional DRM receiver made available by M/s. Thomson Broadcast multimedia was fitted in one mobile van and the other van was provided with a Winradio DRM receiver belonging to the Research Department. Block diagram of the measuring set up provided in the Mobile van is given in Figure-1. Figure 1. Block Diagram of Measuring Set up in the Mobile Van. 
3. Field Measurements The field measurements comprised of following types of tests: Single Channel Simulcast (SCS) and full DRM transmissions were made at 666 KHz frequency using a 100kW high power medium wave transmitter located at Nangli (28 46’ 04” N, 77 08’ 32”E) and extensive reception measurements were carried out. DRM Near Vertical Incidence Sky Wave (NVIS) transmission suitable for tropical broadcasting were carried out at 3.315 MHz frequency using a 2kW SW transmitter set up specially by M/s. Hitachi Electric Kokusai, Japan at High Power Transmitting site Kingsway, Delhi (28o 42’ 41”N, 77o 12’ 3.23” E). Demonstration and coverage measurements of DRM transmission at 25900 KHz (26 MHz band) were made for line of sight local broadcasting with a transmitter specially set up by M/s. Hitachi Electric Kokusai, Japan at Kingsway, Delhi (28o 42’ 41”N, 77o 12’ 3.23” E). 4. Conclusion: (i ) Single Channel Simulcast(SCS) in Medium Wave Single Channel Simulcast was successfully carried out in MW band with the following technical parameters: Analogue carrier peak power: 97.5 kW DRM RMS power: 2.5 kW Analogue carrier peak power to DRM RMS power ratio: 16 dB Analogue bandwidth: 9 kHz DRM bandwidth: 9 kHz DRM mode: A/16/4/0.5/S DRM data rate: 11 kbps Antenna: 115 m self radiating mast
(ii ) Stereo transmission using full 18 KHz Band Width in MW band. Full 18kHz bandwidth in MW band was utilized to provide DRM stereo transmission with following parameters for the first time in the world. DRM power level: 50 kW DRM bandwidth: 18 kHz
(iii ) Demonstration of DRM transmission for local coverage using 26 MHz band. DRM transmissions were provided at 25900 KHz (26 MHz band) to assess the reception for local coverage with the following parameters: DRM RMS power: 500 W DRM bandwidth: 20 kHz
Antenna: 3 element Yagi-Aerial The reception was found good. ( iv ) DRM NVIS Transmission DRM NVIS transmission suitable for tropical broadcasting was provided at 3315 KHz (3 MHz band) with the following parameters: DRM RMS power: 500WDRM bandwidth: 10 kHz DRM mode: B/16/4/0.5/LDRM data rate: 11 kbps Antenna: Dipole H 1/1/.5λ Monitorings were made between late evening and early morning hours at Karnal ( 28o 50' 20" N, 77o 08' 30" E) which is at a distance of about 100 km from transmitter. The reception was found good. Directory: DocFiles DocFiles -> What programs are available? DocFiles -> Department of telecommunications DocFiles -> Radio Amateur Station Operator’s Certificate Examination Relevant Application Forms And Notification the indian wireless telegraph DocFiles -> India Remarks in the National Frequency Allocation Table DocFiles -> Pre-trip Science Activities DocFiles -> Spectrum allotted to operators using gsm based systems in different service area Download 127.38 Kb. Share with your friends:
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