WO2003021848A2 - Digital broadcast system - Google Patents
Digital broadcast system Download PDFInfo
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- WO2003021848A2 WO2003021848A2 PCT/US2002/027804 US0227804W WO03021848A2 WO 2003021848 A2 WO2003021848 A2 WO 2003021848A2 US 0227804 W US0227804 W US 0227804W WO 03021848 A2 WO03021848 A2 WO 03021848A2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
- H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
- H04H60/23—Arrangements for conditional access to broadcast information or to broadcast-related services using cryptography, e.g. encryption, authentication, key distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/26—Arrangements for switching distribution systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2385—Channel allocation; Bandwidth allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2402—Monitoring of the downstream path of the transmission network, e.g. bandwidth available
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/254—Management at additional data server, e.g. shopping server, rights management server
- H04N21/2541—Rights Management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/254—Management at additional data server, e.g. shopping server, rights management server
- H04N21/2543—Billing, e.g. for subscription services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
- H04N21/25866—Management of end-user data
- H04N21/25883—Management of end-user data being end-user demographical data, e.g. age, family status or address
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41407—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8166—Monomedia components thereof involving executable data, e.g. software
- H04N21/8193—Monomedia components thereof involving executable data, e.g. software dedicated tools, e.g. video decoder software or IPMP tool
Definitions
- the present invention relates to broadcast communications systems. More specifically, the present invention is a Broadcast Service Provider system that is used as the communication link between broadcasters and end-users.
- This application claims priority of U.S. Provisional Application Serial No. 60/316,279, filed September 4, 2001.
- a conventional radio news or other information broadcast contemplates a single stream of news items or programming content spoken by a newscaster and simultaneously received by thousands of listeners.
- the newscaster must attempt to transmit items, which are of interest to the maximum number of listeners or viewers (end-users or consumers) in the limited time available.
- the end-users for their part must attend to many items, which are of no interest to them personally in order to catch the relatively few which are of interest. Additionally, the end-users must be available at the time the items are transmitted; delayed listening via recording is not very practical.
- the analog voice nature of radio broadcasts also makes them rather wasteful of scarce spectrum resources.
- a first object of the present invention is to provide a total and complete down link between broadcasters or content providers and end-users.
- a second object of the present invention is to provide digital broadcasting of a variable codec type in the form of TV, audio, visual and data programming to RF receivers spread over a large geographical area.
- a third object of the present invention is to enable a broadcast service provider system that incorporates robust dynamic modulation, on-the-fly codec upgrades, broadband, wired and wireless broadcasting, audio, video, and data-streaming into one black-box solution for electronics manufacturers, broadcasters and consumers.
- a fourth object of the present invention is to enable a broadcasting system that increases the number of channels per transmitter that are available for broadcasting dynamically as two independent factors become more efficient: codec compression and RF hardware QAM density.
- a fifth object of the present invention is to enable a broadcast service provider system in which end-users may be charged on a per-channel basis.
- a sixth object of the present invention is to provide a broadcasting system that may be upgraded without major changes in hardware.
- the system includes a digital channel database that stores a program data-stream provided by a broadcaster, a computer network for accessing and distributing the program to a number of tower controllers, and digital transmitters associated with the tower controllers for transmitting the program to end-users.
- the end-users receive the program via a digital receiver module that may be attached to electronic appliances such as digital TVs, MP3 players, cellular telephones, etc.
- Each part of the system may be software configurable so that data transmission standards may be upgraded without major changes in hardware.
- FIG. 1 illustrates one embodiment of the system for providing broadcasting services according to the present invention
- FIG. 2 illustrates the information that may be displayed to an end-user of the broadcasting services
- FIG. 3 illustrates an array of transmitters for broadcasting digital signals to several end-user locations
- FIG. 4 illustrates one embodiment of the digital signal transmitter of the present invention.
- FIG. 5 illustrates one embodiment of the digital receiver module of the present invention. Detailed Description of the Invention
- BSP Broadcast Service Provider
- ISP Internet Service Provider
- CSP Cellular Service Provider
- An ISP sells connection services to its customers, who otherwise would have to install an Internet line directly to their home or place of business, setup servers, register Internet Protocol addresses, install routers and setup security measures. The cost would be very prohibitive to individuals. If they had any technical problems, they would be responsible for identifying, solving and fixing any issues in addition to all of the money spent on the setup.
- ISPs provide a worry-free way of reaching those core goals by distributing the cost of the bandwidth, servers, hardware, maintenance and repair to all subscribers on the system, thus taking advantage of economies-of-scale.
- the services an ISP provides its customers may be summarized as follows:
- CSPs Cellular Service Providers
- a CSP distributes the cost of base stations and phones across millions of users and over the course of several years of time. As is the case for ISPs, the economies-of-scale play a tantamount role in reducing the per-user cost of the service. Customers pay a base-fee for using the system plus additional charges commensurate with their usage.
- the Services a CSP provides customers may be summarized as follows:
- the present invention allows broadcasters to provide individualized broadcasting services, which in turn allows the BSP to charge customers for a specific usage.
- the BSP system of the present invention provides channels to broadcasters and content providers for transmission to individual consumers (end-users receiving the broadcasted signals). The consumers may be charged on a per channel basis by the broadcasters and content providers.
- a BSP supplies the market with the needed medium through which broadcasters and consumers can communicate. Broadcasters and content providers are then alleviated from expensive equipment setup, maintenance, costly repairs, and capital equipment expenditures. They can focus on their core business objectives: producing and distributing programming and content. Consumers receive numerous digital-quality free broadcast channels and can selectively pay for additional channels that meet their specific needs and desires, paying only for what they use.
- a BSP may provide: la) Broadcaster: Access to a digital broadcasting system from anywhere in the nation, lb) Consumer: Access to digital broadcasting from any consumer RF Appliance,
- BSP system The following are core reasons for customer demand on BSP system: la) Broadcaster: Low-cost barrier to any local, regional and nationwide market of consumers, lb) Consumer: Low-cost barrier to purchase RF appliance and receiver broadcasts nationwide;
- FIG. 1 illustrates the broadcasting process flow according to the system 100 of the present invention.
- the system 100 may include a Digital Channel Database (DCD 101); a number of content providers or broadcasters 103; a wide area network (WAN 105); tower controllers (TCs 107); digital transmitters 109; and a number of appliances connected with a digital receiver module (MP3 player 119, cellular telephone 121, and a TV 123).
- DCD 101 Digital Channel Database
- WAN 105 wide area network
- TCs 107 tower controllers
- MP3 player 119, cellular telephone 121, and a TV 123 digital receiver module
- the information to be broadcasted is referred to as the media source 113.
- the database 115 may include content data streams.
- the media source may represent a Compact Disc, magnetic tape, microphone, ticker- tape feed (AP newswire, Stock info, etc.), hard drive, or any medium through which content can be transferred or converted to a data-stream.
- the database 115 represents the stored content of the broadcaster/webcaster/content provider which can include programming content (such as audio files - like MP3 or WMA -, video files - like MPEG2, MPEG4, DivX - , text files, etc.), advertising, and any other files the broadcaster/webcaster/content provider may wish to archive or store.
- the database 115 is not necessarily on-site with the broadcaster.
- the DCD 101 mat also store programming content and advertising for purchase by the broadcasters.
- a broadcaster could use the DCD 101 as its studios database of the programming content. The broadcaster would simply queue up an order in which its programming and advertising should be played, and control the transmitting of its data- stream remotely from its location office. The data-stream would then originate from the DCD 101 and move directly to the tower controllers, removing the need for a continuous internet link in between the broadcaster and the DCD 101.
- a codec 111 may be transmitted to end-users in order to upgrade a codec previously stored in the end-users digital receiver.
- the broadcaster 103 provides the broadcast service provider (BSP) with the data-stream from the media source to be transmitted to the end-user.
- BSP broadcast service provider
- the BSP may store the media or program in the DCD 101 before transmitting it to the TCs 107 via the WAN 105.
- an encryption key 117 may be required to decode the information sent over the WAN 105.
- the TCs 107 may then select the towers 109 that will broadcast the program.
- the DCD 101 may be defined as the collective group of servers that reside at the core of the BSP system. Any company, consortium, or individual can use the BSP system to transmit content to consumers, by sending the data-stream of content from the broadcasters studio to the DCD 101.
- a software package is provided by the BSP to content providers and broadcasters 103 to facilitate this process.
- a modified version of a Shoutcast server software would create an avenue for Webcasters to divert one of the Internet-based data-streams directly to the DCD 101 for dissemination, while allowing users to continue to hook up via the web to the Shoutcast server.
- An example of the modified version includes the labeling of one of the DCD servers by the web/net cast server software as a permanent client of the data-stream.
- the DCD 101 serves this function by providing the content provider with 4 types of information:
- the bit-rate availability may be calculated based on the proposed bit-rate of the programming content coming from the broadcaster. For example, if a content provider want to transmit 128 kbps MP3 files, then the DCD 101 determines if that much bandwidth is available on every tower that the content provider wants to broadcast from. If the bandwidth is not available on certain or all towers, the DCD 101 returns the available bandwidth parameter back to the content provider. The broadcaster could then make adjustments according to the bandwidth space available.
- Bandwidth requirements may be determined by adding three values: the total data- rate of the broadcast data-stream, additional text information the broadcaster wants to add, and a small amount of RF overhead.
- additional text information that also take up bandwidth are, geographic location, telephone number, codec type, bit rate, currently playing song/video title and artist, purchasing information, etc.
- Shoutcast software as viewed from the Winamp audio player, is an example of displaying this type of additional information.
- FIG. 2 illustrates how the user interface might appear on a car stereo/CD player.
- the information that may be displayed includes music classification 201, station ID 203, station location 205, data rate 207, broadcast coder 209, and station's phone number 211.
- a content provider would pay exactly for what it wanted in terms of coverage area, while leaving the technical issues of broadcasting to the BSP.
- a graphical view of the proposed broadcast areas would reveal a detailed picture of exactly where consumers could receive the channel. If "white space", or dead areas existed in the coverage pattern, the content provider could modify or expand the desired coverage pattern to reach the desired areas, similar to the way the Cellular Service Providers package their coverage areas.
- the technical solution for the graphical view is solved by loading the DCD 101 with a detailed set of Geographic Information System (GIS) topography and then calculating RF penetration based on previously successful RF algorithms.
- GIS Geographic Information System
- mathematical algorithms from engineering software designed to aid in cellular antenna placement and two- way radio communications tower placement can be used. Obstacles, such as large buildings, will be added where appropriate.
- Previous database applications of GIS topography to establish saturation patterns in the environment have been successfully used in a similar manner by the US Navy for determining environmental changes before and after weapons testing.
- the database serves as an aid to systems engineers in placing new towers and moving existing towers. Resolution of the graphical view may be below 0.5 miles. Selection of the desired coverage areas by broadcasters can be based on city, county, state or geographic boundaries. Broadcasters may adjust and modify coverage areas on the web by changing the parameters of coverage on the database and performing a new query. For example, a Seattle- based broadcaster can also reach other urban markets like Chicago, Dallas, Atlanta, San Francisco, and Washington, D.C. through the BSP system. Cost of Service
- Content providers may reach heavily guarded markets for a nominal monthly cost. As discussed above, with the use of the BSP system, any content provider can phase out its own broadcasting equipment and focus on content creation and advertising revenue generation.
- broadcasters will know exactly the total monthly, quarterly, and annual cost of broadcasting. This enables the broadcasters to determine where to broadcast (i.e., whether it is feasible) and prioritize the audiences to be reached. Consumer Demographics
- the final piece to the DCD 101 is the demographic data maintained on a nationwide basis. Broadcasters may use the data to gain knowledge of several key parameters about the proposed audience: gender ratios, racial cross- sections, age groups, urban population, suburban populations, rural population, average annual income, and many other bits of information. This information is also relevant to broadcasters with respect to selling and raising advertising revenue from companies looking for a specific consumer audience. Additional Aspects of DCD
- the DCD 101 may reside on a nationwide, mission-critical, private Wide Area Network (WAN 105). Once the data-stream from the broadcaster reaches the DCD 101, the data-stream can be forwarded to all specified transmitters or cached for gradual release at a later or specified time. When the data-stream is needed at a transmitter, the DCD 101 forwards it to the appropriate Tower Controller ( TC 107) across the WAN 105. Broadcasters may choose to upload several hours' to several days' worth of programming onto the DCD 101. The DCD 101 would then forward the data-stream during the appropriate hours according to the parameters set by the broadcaster. For example, a broadcaster may choose to queue up a total of 24 hours of programming and then upload the data to the DCD 101 in a matter of minutes. The database DCD 101 then manages the time to begin transmitting that queue of data across the WAN 105 to the transmitters through the TCs 107, thus alleviating the need for a constant stream coming from the broadcaster. 2.
- TCs 107 Another element in the BSP system is the TCs 107, which may be defined as mission- critical servers. After a data-stream arrives at any TC 107 from the DCD 101, the TC 107 attaches security and control parameters to the data-stream before forwarding the data-stream to the transmitters 109. The TC 107 performs four significant tasks: 1) adds encrypted authentication on the data-stream, 2) adds any required codecs, 3) sets the RF controls on the transmitter for this particular data-stream, and 4) adds pay-per-channel receiver identification if applicable. Encrypted Authentication
- An encrypted key that is decipherable by a receiver identifies every data-stream.
- the key may be 128-bits in length and serve in the following ways: prevent receivers from installing harmful contents from the codec part of the data-stream, allow control of digital rights management, and authorize the decoding of pay-per-channel services.
- a codec may be defined as software program that decodes a compressed stream of digitized data back into its original data-file format. For example, station XYZ may decide to switch from an older version of the MP3 codec to a newer version that can produce the same audio quality at a lower bit-rate. The old version may have required 128kbps but the newer codec uses 96 kbps.
- the broadcaster may send the new codec to the DCD 101.
- the database forwards the codec to the appropriate TCs 107 and whenever that particular broadcaster's data-stream comes through with the tag to attach the codec, the uploaded codec file would be integrated into the RF channel on the transmitter.
- the present invention may include the use of software controlled RF transmitters.
- Transmitter hardware is expensive and not easy to upgrade.
- the rate at which RF modulation technology progresses would require a hardware update about every 18 months to stay up with advances at a reasonable rate.
- parameters may be modified without any hardware updates for a longer period of time.
- the BSP system may program the QAM modulation rates from the TC 107. Spacing of the channels may be dynamically allocated as well as other parametrics that control the way the transmitter and receiver communicate by the TC 107.
- Broadband bandwidth over the WAN from the TC 107 to the transmitters requires an accurate calculation of the total number data-streams and the total bandwidth of the data- streams to control costs of broadband and maximize usage.
- the second method requires a point to multipoint broadband link from the TC 107 to every transmitter. However, this would represent an inefficient use of broadband spectrum.
- the broadband WAN 105 is therefore preferably linear in its design with the ability to re-route around any node that is not functioning properly.
- the TC 107 adds the ID of the receivers that are authorized to decode the PPC data-stream periodically.
- the receiver ID may then be followed by an encrypted key specifying to the receiver which of all the PPC data-streams it is authorized to decode.
- the TC 107 keeps track of 3 pieces of key information: the data-stream authentication key, the specific receiver ID key, and the PPC authorization key. 3. DIGITAL TRANSMITTERS
- the Digital Transmitters may be defined as software controlled RF signal transmitters 109. They may use five parametrics sent by the TCs 107 for every channel.
- the five channel parametrics are 1) channel center frequency, 2) channel width, 3) subcarrier spacing, 4) symbol rate, and 5) frame rate. Once these are set, they do not need to be retransmitted by the TC 107 until a change is required.
- the five parametrics for every data- stream may be transmitted via a single control channel that constantly outputs all of this information for every channel.
- the control channel is referred to be the Radio Frequency Allocation Control (RFAC) channel.
- the transmitters 109 may also receive specification for RF power output from the TCs 107.
- the Digital Authentication Key may be defined as the key created by the TC 107 for every channel.
- the DAK is identified and decrypted by the transmitter 109 to verify that the data-stream is legitimate and that the decryption key is working. If there is a problem, the transmitter 109 informs the TC 107 that the decryption process has failed. The TC 107 may then proceed in the following order to resolve the problem: 1) retry with a new DAK, 2) verify other DAKs are working on other channels, then 3) shut off transmission of the channel at the DT 109 and notify the DCD 101 the DAK is failing on the transmitter. Use of the DAK in this manner prevents tampering by outside sources and ensures that the receiver decryption scheme is working.
- the DT 109 transmits the DAK of every channel through the RFAC channel to ensure that consumer products do not decode any harmful or unauthorized data-streams. Transmitter Arrays
- FIG. 3 illustrates the concept of a tower array set in the south of Florida.
- tower arrays Another benefit of tower arrays is the real-time RF power output adjustments that can be made by the TC 107 to compensate for a particular tower/transmitter that is down for maintenance, power outage, or other reasons.
- Transmitter arrays and TC 107 server clusters provide a significant amount of high-reliability and high-availability for any broadcaster looking for a true digital convergence broadcasting solution.
- the server 301 in the center of the graphic represents a single TC 107 for the region.
- the line 303 represents the broadband backbone coming from the DCD 101.
- Each of the towers 305-313 may be connected directly to the TC 107. Any broadcaster desiring to reach the southern Florida markets would be able to select, through the DCD 101, which towers they wanted their data- stream transmitted from.
- Software upgrades and patches may be sent from the TCs 107 to the transmitters 109 in order to improve digital modulation schemes, security and system efficiency. This can be done via the WAN 105. Transmitter hardware does not need to be replaced when new modulation methods and techniques become available, such as the error correction methods, channel-coupling modes, and other RF parametrics.
- the TC 107 servers may reprogram and update the transmitters 109 remotely via the WAN 105.
- a Unix-based environment may be used to accomplish this because of its inherent ability to shutdown specific services, run updates, and then restart the services without re-booting the entire operating system. Certain versions of Unix also provide a stable, mission-critical certification for use in operations where 6 sigma (i.e., 99.999%) reliability is imperative. 4.
- the RF transport method of the present invention may be defined as the radio frequency link between the transmitter and receiver. It handles three critical aspects of broadcasting in the RF spectrum: RF spectrum availability, RF modulation bandwidth, and data compression efficiency. There are several minor factors as well, but only one worthy of note here: susceptibility to intentional, destructive interference.
- the system of the present invention is capable of providing robust and dynamically controlled RF carriers, efficient narrow-spectrum management, and incorporation of improved codecs.
- RF spectrum can be added selectively across the array of transmitters 109 where a certain region of the RF spectrum is available in one area but not available in other parts of the country.
- Channels may be added to the BSP system.
- Selectivity of RF space is relevant in handling the load requirements in areas with higher demand by broadcasters and consumers. For example, highly populated urban areas (1.5 million people) may require 3-4 times the amount of channel space used by less populated areas (75,000 to 100,000 people).
- the DCD 101 moves the affected channels to other available RF spectrum and transmits the changes to the receivers through the RFAC.
- the transmitters 109 report continuity of channel performance by monitoring the RF spectrum in use by the BSP for harmful interference. Changes made to channel allocation are reported back to the DCD 101 to maintain the nationwide network of channel usage and availability.
- BSP RF channels are not necessarily discrete in size.
- a BSP channel is as wide as it needs to be in order to carry the payload. Once the bit-rate of the payload is determined, the channel width is specified based on the calculated pay load.
- the present invention may make use of a basic unit for measuring a channel size and for relaying that information to the receivers. Describing the combining process of the BSP channel blocks is simplified by the use of a few terms. These terms represent a mathematical unit in the RF spectrum for use in BSP digital broadcasting, similar to the way Hertz (Hz) or Watts (W) are used to define cycles per second or power output.
- Hz Hertz
- W Watts
- the base unit for purposes of the present invention, for the channel size is 2 kHz and may be called a Quadra Digital Channel (QDC) or "Brick". Eight Bricks combined form a channel 16 kHz wide called a Biquartic Digital Channel (BDC) or "Corbel”. Bricks and Corbels may be combined and added together as many times as needed to obtain the desired bandwidth on the RF carrier.
- QDC Quadra Digital Channel
- BDC Biquartic Digital Channel
- Bricks and Corbels may be combined and added together as many times as needed to obtain the desired bandwidth on the RF carrier.
- the abbreviated form of these units may be written "Brk” for Bricks and "Crb” for Corbels.
- the following table provides a listing of the bandwidth sizes:
- Bricks and Corbels may be written in decimal form where the number to the left of the decimal represents Corbels and the number to the right represents Bricks.
- the combined unit, Crb+Brk, may be written "cb" and represents the BSP channel unit Corbel-Bricks.
- the corresponding number of units of Corbel-Bricks to specify the bandwidth of a particular channel is attached to the Channel Frequency Identifier (CFI).
- CFI specifies the starting or center frequency of a BSP channel. For example, a BSP channel at 470.262 MHz with a bandwidth of 156 kHz would be written in decimal form as "cfi470.262+cb9.6".
- a BSP channel exists using a 128 QAM rate, it would carry 15% more data than a channel using 64 QAM, so the channel using 128 QAM can be narrower than the 64 QAM channel carrying the same data.
- Advancements in solid state Digital Signal Processors (DSP), Integrated Circuits (IC) and System on Chip (SoC) devices enable the dynamic BSP modulation standard to take form. Further advancements in these areas will allow higher modulation densities to be used freeing up more RF space for additional channels.
- DSP Digital Signal Processor
- IC Integrated Circuits
- SoC System on Chip
- Digital broadcasting is not limited to any one codec or group of codecs. Broadcasters produce their programming content with whatever particular codec they prefer and transmit a data-stream to the DCD 101 via a broadband Internet connection.
- the DCD 101 authenticates and disseminates the data-stream to the transmitters 109, which place the data-stream onto an RF carrier.
- the broadcaster identifies the codec type of the data-stream to the DCD 101. If the broadcaster so chooses, the codec may be transmitted via the RFAC channel in association with that particular broadcasters data-stream.
- Every BSP receiver is capable of stripping off the codec from the RFAC, authenticating the codec's legitimacy through the DAK, installing the codec into the library of codecs on the receiver, and then playing the original content from the broadcaster using the new codec. This process is transparent to the consumer.
- the broadcasters can take advantage of codec compression efficiency advancements by transmitting their preferred codecs to the consumers. For example, when the MP3 codec first came out, it required 196 kbps to maintain near-CD quality. Current MP3 codecs are near-CD at 128 kbps or even 96 kbps. The latest Windows Media Audio (WMA) codec from Microsoft can also achieve near-CD quality between 64 and 128 kbps. As this efficiency of compression increases, broadcasters using the BSP system of the present invention can incorporate codec advancements into their data-streams, reducing the cost of the channel and freeing up more space for other channels. If a consumer wants to playback the recorded broadcast on a computer, the proper codec will have to be installed from either the receiving unit or downloaded from a website hosted by the BSP.
- WMA Windows Media Audio
- Spread-spectrum standards boast of resistance to all of the major drawbacks of wireless telecommunications, but are limited in two ways.
- the first limitation is the finite number of Walsh/PN codes that can be used as subchannels on the main RF carrier.
- Spread- spectrum transmission necessitates a fixed, static, and continuous RF channel space to operate in because it uses logical, code-based subchannels on a single carrier.
- the second limitation for spread-spectrum is its inability to support software-based dynamic re-allocation of channel usage and size. Dynamic changes to the modulation structure and size of the spread-spectrum channel are highly undesirable, because of the inefficient way of transmitting such changes to the receiver.
- OFDM Pulsed Orthogonal Frequency Division Multiplexing
- This change in the hardware of the transmitter and receiver can be easily implemented through software-controlled ASICs. This does not create a complex system when implementing dynamic reallocation because dynamic changes to the channel structure in OFDM are made by simply defining the start and stop point of the channel in the RF spectrum, or by specifying the center frequency of the channel and the frequency range above and below needed to define the channel size in Hz.
- the primary concerns of narrow-channel standards versus spread-spectrum standards in terms of broadcasting are multipath, fading and cross-talk problems generally associated with non-spread-spectrum receivers. This is especially true when an intentional destructive interference pattern is created to undermine a BSP broadcast channel.
- the present system overcomes these obstacles by monitoring all broadcast channels at the transmitter and dynamically reassigning channels if and when interference is detected. When a channel is reassigned due to interference, the broadcast data-stream is shifted to an interference-free channel and the system temporarily excludes the use of the bad channel until the interference no longer exists. All BSP receivers are notified of these changes through the RFAC channel. The ability to dynamically manage channel allocation protects the system from intentional and incidental destructive interference. Modulation Scheme
- the BSP Digital standard modulation scheme is based on Quadrature Amplitude Modulation (QAM) techniques.
- the BSP may use 64 QAM as the modulation rate.
- Transmitters and receivers are software re-configurable to handle QAM modulation rates between 16 and 512.
- Every Quadra Digital Channel (QDC) is simply a building block for combining RF spectrum to make up a payload carrying data- stream, which can accommodate a variety of bit-rates. For example, a broadcaster can change from 64 kbps audio programming to 200 kbps video programming by purchasing the appropriate amount of QDC bricks and BDC corbels from the BSP, until sufficient RF bandwidth is produced.
- Each BSP broadcast channel may contain three major segments: Digital Data Stream (DDS), Codec Data Stream (CDS), and Key Data Stream (KDS).
- DDS Digital Data Stream
- CDS Codec Data Stream
- KDS Key Data Stream
- the Digital Data Stream is host to the payload, and varies in width depending on the data rate of the data-stream coming from the broadcaster.
- the data-stream may be a compressed stream of data for which the broadcaster has purchased RF bandwidth.
- the broadcaster's compressed data-stream passes through the DCD 101 onto the appropriate transmitters 109 for broadcasting on specified channels.
- the transmitters 109 transmit the DDS payloads according to bandwidth specification set by the TCs 107.
- the bandwidth specifications are developed and calculated by the database when the broadcaster signs up for service.
- the first is to attach the codec to the RFAC for all receivers to pick up.
- the second is to use the CDS segment on the channel itself.
- the receiver detects a codec in the CDS segment, the receiver parses the codec from the DDS, checks the DAK and stores the codec for current and future use.
- the CDS segment is not used and is indicated by the RFAC for that specific data-stream.
- the TC 107 indicates to the transmitter to transmit the codec in either the RFAC itself or load it into the CDS segment.
- the RFAC and CDS segments may continually transmit a codec until it is determined that the codec is no longer needed in the RF data-stream.
- the codec only needs to be installed once on any given receiver, so the codec itself may contain an ID flag specifying the codec type and revision.
- the receiver continually receives the codec from the RFAC or CDS segment, and therefore, may identify that a particular codec is already installed and take no action. Other ways to transmit the codec to the receiver are also possible.
- the Key Data Stream (KDS) segment may include the broadcaster identification, channel authentication, and several key flags for the receiver to interpret.
- BSP enabled receivers may first resolve the KDS segment before interpreting the data contained in the DDS and CDS, although all of the channel data might be demodulated at this point.
- the KDS segment may be identified by a fixed delimiter based on the "cfi + cb" information from the RFAC channel.
- the KDS can be either a fixed size, independent of the channel bandwidth, or a fixed percentage of the total BSP channel.
- the KDS segment may host several digital "keys" that provide information about the broadcaster and the BSP channel.
- These digital “keys” may include FCC identification (if required), station name, geographical location, CDS usage, CDS size, channel coupling information, and any authorization keys that are needed, such as the pay-per-channel data. Additional “keys” may be added when a need arises. Information about the content of the data-stream may be included by the originating codec, such as ID3 tags in the MP3 files.
- the DAK serves as a security feature because it identifies to the receiver a legitimate BSP signal coming from the channel database.
- the DAK may be an encrypted string that is created by the TC 107, and authenticated by the transmitter and the receiver.
- a legitimate data-stream can be resolved by its key based on standard public-private key encryption standards similar to Pretty Good Privacy (PGP), RSA or other similar methods for secure communication.
- PGP Pretty Good Privacy
- RSA Pretty Good Privacy
- the BSP Digital transport method may use a modified Pulsed Orthogonal Frequency Division Multiplexing (P-OFDM) scheme.
- P-OFDM Pulsed Orthogonal Frequency Division Multiplexing
- the version of P-OFDM is robust in handling channel bandwidth adjustments. Dynamically adjusting an in-use RF channel has been a technically insurmountable obstacle until recent silicon chip innovations in complexity and processing power. Previous to these advancements, the RF research and design work of the last fifty years has focused on integrating new technology on top of old methods of telecommunications.
- Cellular/mobile communications TDMA, GSM and CDMA
- DirecTV DirecTV
- PrimeStar cable TV
- IBOC radio high definition radio
- RF transport method of the present invention is one such standard, as will be discussed in the next section.
- the RF transport method may also be narrow- channel, self-correcting, and software re-configurable to allow for easy adjustments to channel structure, modulation rates and application updates.
- the integration of these three advancements into a single SoC module defines the convergence bridge, which creates renewable RF telecommunication standards for the 21 st century.
- BSP-OFDM may be defined as the modified version of the P-OFDM method for transporting digital data-streams according to the present invention. It possesses specific features that are critical to the performance of the BSP broadcasting system.
- BSP-OFDM works by pulsating QAM symbols across several narrow-subchannels inside the main channel allocation structure. Two types of guarding on the subchannel framework provide clear RF reception at the receiver: time interval and RF spacing interval.
- the time interval known as a frame, specifies the amount of time that the QAM symbols are transmitted.
- the spacing interval specifies the distance in Hertz from peak-to-peak between two adjacent subchannels. Together these two parameters enable a receiver to resolve each QAM symbol pulse on every subchannel. Dynamics of BSP-OFDM
- BSP-OFDM is not limited to a specific time interval or channel bandwidth. Subchannels in every BSP channel can be added or subtracted depending on the performance and desired data-rate of the channel.
- the channel structure for BSP radio includes Bricks and Corbels.
- the data-rate of any given channel may depend on four factors: channel size, QAM rate, pulsed time interval, and subchannel spacing. These parameters may be transmitted along with the Channel Frequency Identifier (CFI), from every BSP transmitter on the specific RF Allocation Control (RFAC) channel. This provides receivers with the necessary information to tune to any broadcast-stream coming from the transmitter. It also eliminates the need for receivers to "scan" for broadcast channels since tuning directly to the RFAC provides this information.
- CFI Channel Frequency Identifier
- RFAC RF Allocation Control
- the RFAC may transmits the CFI with all four parameters for every BSP channel in use. Up to 10 RFAC channels may be used so that no two adjacent transmitters use the same RFAC channel.
- the block diagram in FIG. 4 provides a general view of the RF transport method logic at the transmitter 400.
- the transmitter 400 may be used to broadcast the data stream 401.
- the transmitter may include a combiner/interleaver 403; a QAM modulator 405; a pilot signal generator 407; an Inverse Fast Fourier Transform DSP 409; a band guard insertion module 411; a digital-to-analog converter 413; a BSP- OFDM multiplexer 415; an amplifier 417; and an antenna 419.
- the CFI specifies the starting or center frequency for the specific channel.
- the channel size parameter may be attached to the CFI in the form of Corbel-Brick units.
- the pulsed time interval is the amount of time a particular QAM signal is sent. This may be more properly called a "frame".
- the subchannel spacing specifies the distance between each subcarrier's peak signals, much like the distance between two FM radio stations. For example, FM stations broadcasting at 101.3 and 101.5 are spaced 200 kHz away from each other.
- C represents the BSP- OFDM channel size parameter and can be delineated in Hertz or Corbel-Bricks.
- the "W” represents the peak-to- peak width or distance between two adjacent subcarriers and may range from 100 Hz to 2000 Hz in 100 Hz steps.
- S represents the modulation Symbol rate where QAM rates range from 16 to 1024, and beyond. Pulsed time intervals of QAM symbols are measured in frame rates and are represented by "F", ranging from 10 nanoseconds to 1000 milliseconds (which is equal to 1 second).
- D represents the data-stream bit-rate of the particular channel.
- the calculated theoretical rate may not be indicative of the actual system performance.
- the loss in spectral efficiency may be approximated to be between 20% and 40%.
- the DCD 101 also augments the data-stream with the KDS segment and CDS segment, if necessary, before forwarding the data-stream to the appropriate TCs 107.
- the TCs 107 send the fully concatenated data-stream to the transmitters with the CFI and four parametrics (channel size, modulation rate, time interval, and subcarrier spacing) attached to the data-stream for broadcasting.
- One final adjustment to the equation may be performed to properly reflect the actual bandwidth needed to carry the concatenated data-stream, which includes the DDS, CDS and KDS segments.
- the KDS segment consumes an amount of space that is approximately 2-8 kbps in size.
- the CDS and DDS segments share the rest of the space in the channel, depending on the needs of the broadcaster. Normally, if a broadcaster wanted to deploy a codec with the data-stream, the CDS would consume 25-35% of the available throughput with the DDS consuming the rest, but this percentage is not fixed.
- the "D" factor in the equation should then include the fixed KDS segment and possibly the CDS segment along with the DDS.
- An Internet radio broadcaster sends a 128 kbps data-stream of MP3 audio to the DCD 101 for nationwide broadcast.
- the CFI and four parametrics are set by the DCD 101 to 400 Hz for W, 64 QAM for the modulation Symbol rate S, 3.33 milliseconds for the frame rate F, and 70% efficiency for the Loss factor.
- the P factor is 0.9 (90%).
- a 2.6cZ? BSP channel would provide the bandwidth needed to transmit the 128 kbps MP3 audio data-stream.
- a broadcaster transmits a 64 kbps WMA data-stream to the DCD 101.
- a new version of the codec is required to obtain CD-quality audio from this data-stream.
- the codec itself is 124 kilobytes in size.
- the broadcaster desires the codec deployment to take place in less than 5 seconds, so the data-rate of the CDS segment must be sufficient to contain the file every 5 seconds.
- Subcarriers will be slightly more compact in this example at 300 Hz (W)
- the Symbol rate will remain at 6 bits/frame (64 QAM)
- the frame rate S will drop to 3.0 milliseconds (333 frames/sec)
- the efficiency factor will stand at 70%.
- Both the 124-kilobyte codec and the 48 kbps WMA data-stream can be broadcast in a BSP channel only 60 kHz wide. 5. DIGITAL RECEIVER MODULES
- BSP receivers may include a dual receiver design where one RF path is locked onto the RFAC while the other RF path tunes to the selected data-stream.
- receivers can track a broadcaster's data-stream from one location to another even if switching frequencies is required.
- a similar process takes place in the cellular industry when a handset is handed off from one base station to another based on several indicators such as the Received Signal Strength Indicator (RSSI).
- RSSI Received Signal Strength Indicator
- Consumers do not need to keep track of channel numbers or frequency numbers because the receiver always identifies the programming type and broadcaster source by name.
- the consumer interface may use LCD or other display technology, to list the available broadcast streams.
- Figure 4 is a block diagram depicting the RF path of a BSP receiver 500.
- the receiver 500 may include an antenna 501; a low noise amplifier 503; a BSP-OFDM demultiplexer 505; an analog-to-digital converter 507; a symbol and frequency synchronizer 509; a guard band removal circuit 511; a Fast Fourier Transform DSP 513; an error control decoder 515; a QAM demodulator 517; a decombiner/deinterleaver 519; and an output of the data stream 521.
- the BSP receiver may be defined as a receiver designed to receive and decode channels transmitted by the BSP.
- the receiver will also be referred to as a Digital Receiver Module (DRM).
- DRM Digital Receiver Module
- the DRM may attempt to demodulate the RFAC using a priority list of QAM rates. For example, the initial list might be in this order: 64, 32, 16, 128, 256, and 512. This list can also be updated by a valid RFAC for future use.
- the DRM may also include a predetermined list of channel bandwidths to demodulate the RFAC from. This list can also be updated through a valid RFAC channel.
- the initial list may, for example, be 4.0 cb, 8.0 cb 10.0 cb, 0.8 cb, and 2.0 cb.
- the RFAC channel provides the receiver with a list of available channels plus the five parametrics for each channel, which are center frequency, channel bandwidth size, modulation rate, frame rate, and subcarrier spacing.
- the DRM can be programmed by the user to either switch to a data- stream of similar content or to do what the electronics manufacturers decide is best for their products. Consumers may be able to move about from coast to coast listening to the same content provider because the DRM has automatically changed channels to the same content provider whenever possible.
- DRMs may be integrated into any RF appliance.
- the appliances may include MP3 players, portable boom-boxes, car stereos, cell phones, PDAs, USB & PCI devices on computers, walkmans, CD players, TVs, HDTVs, clock radios, deck receivers, DVD players, satellite receivers, VHS players, set-top boxes and computer monitors.
- Any DRM can receive codec updates. Codec upgrades may be downloaded into the receivers through the RFAC. If a codec is present in the RFAC that is not installed on the DRM, it will be installed after the DAK is authenticated.
- a receiver may also install a codec from the CDS segment when a broadcaster elects to use that method for codec deployment. Malicious attacks on DRM-enabled RF appliances may be stopped during the DAK authentication process.
- BSP Digital broadcasting system Any type of data that can be compressed and decompressed can be transmitted over the BSP Digital broadcasting system. Surround Sound, 5.1, 4.1, digital TV, and other enhancements may be viewed on BSP receivers with the respective codec and proper user interface, such as an LCD screen.
- a broadcaster can use a text and graphics codec to relay information like stock ticker tapes, AP news feeds, weather service information, TDD services, advertising, or any other information that can be compressed and decompressed by a codec.
- the BSP transmission is not just a replacement of the analog radio and TV signals; it is a complete digital convergence solution for all consumer entertainment and educational needs.
- Digital rights management is a very sensitive subject for content creators, producers, broadcasters and consumers. The list below briefly defines the methods for protecting copyright holders while not displeasing the broadcasters and consumers.
- Every BSP receiver may include a unique 64-bit ID and 128-bit encrypted key.
- a consumer can sign up for pay channels via the web or toll-free number. The consumer need only know the serial number of all BSP receivers they wish to get the pay channel on and have a method of payment such as a credit card, etc. Consumers can then select exactly which channel or channels they want and pay a per channel per device fee of, say $0.25 to $1.00, depending on the number of receivers and the price structure of the broadcaster. For example, some broadcasters may allow up to 4 receivers each time a $1.00 fee is paid for a particular channel.
- the DCD 101 would transmit the authorization codes for the specific pay channels on the specific receivers.
- the DCD 101 authorization codes may include the 64-bit ID, the 128-bit encrypted key, and every 20-bit station ID string that the consumer has paid for. Every 3-5 days the authorization codes may be re-transmitted again allowing continued reception of the pay channels. After a reasonable period, for example 6-10 days, if the BSP radio has not received authorization codes for a specific channel, the receiver would shut off access to that channel. If problems existed where a legitimate consumer has paid for a channel but was not receiving it, the consumer would contact BSP customer support via the web or toll-free number and have the authorization codes transmitted within 15-20 minutes.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2002323531A AU2002323531A1 (en) | 2001-09-04 | 2002-09-04 | Digital broadcast system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US31627901P | 2001-09-04 | 2001-09-04 | |
US60/316,279 | 2001-09-04 |
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WO2003021848A2 true WO2003021848A2 (en) | 2003-03-13 |
WO2003021848A3 WO2003021848A3 (en) | 2003-08-21 |
WO2003021848A9 WO2003021848A9 (en) | 2003-10-09 |
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PCT/US2002/027804 WO2003021848A2 (en) | 2001-09-04 | 2002-09-04 | Digital broadcast system |
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AU (1) | AU2002323531A1 (en) |
WO (1) | WO2003021848A2 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001017255A1 (en) * | 1999-08-27 | 2001-03-08 | Nokia Corporation | Mobile multimedia terminal for dvb-t and large and small cell communication |
EP1113605A2 (en) * | 1999-11-22 | 2001-07-04 | Lucent Technologies Inc. | Methods and apparatus for identification and purchase of broadcast digital music and other types of information |
US6374177B1 (en) * | 2000-09-20 | 2002-04-16 | Motorola, Inc. | Method and apparatus for providing navigational services in a wireless communication device |
US6442285B2 (en) * | 1999-05-19 | 2002-08-27 | Digimarc Corporation | Controlling operation of a device using a re-configurable watermark detector |
US6490432B1 (en) * | 2000-09-21 | 2002-12-03 | Command Audio Corporation | Distributed media on-demand information service |
-
2002
- 2002-09-04 WO PCT/US2002/027804 patent/WO2003021848A2/en not_active Application Discontinuation
- 2002-09-04 AU AU2002323531A patent/AU2002323531A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6442285B2 (en) * | 1999-05-19 | 2002-08-27 | Digimarc Corporation | Controlling operation of a device using a re-configurable watermark detector |
WO2001017255A1 (en) * | 1999-08-27 | 2001-03-08 | Nokia Corporation | Mobile multimedia terminal for dvb-t and large and small cell communication |
EP1113605A2 (en) * | 1999-11-22 | 2001-07-04 | Lucent Technologies Inc. | Methods and apparatus for identification and purchase of broadcast digital music and other types of information |
US6374177B1 (en) * | 2000-09-20 | 2002-04-16 | Motorola, Inc. | Method and apparatus for providing navigational services in a wireless communication device |
US6490432B1 (en) * | 2000-09-21 | 2002-12-03 | Command Audio Corporation | Distributed media on-demand information service |
Also Published As
Publication number | Publication date |
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WO2003021848A9 (en) | 2003-10-09 |
AU2002323531A1 (en) | 2003-03-18 |
WO2003021848A3 (en) | 2003-08-21 |
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