WO2004080074A1 - Transmitter and receiver for determining locale - Google Patents
Transmitter and receiver for determining locale Download PDFInfo
- Publication number
- WO2004080074A1 WO2004080074A1 PCT/IB2004/050187 IB2004050187W WO2004080074A1 WO 2004080074 A1 WO2004080074 A1 WO 2004080074A1 IB 2004050187 W IB2004050187 W IB 2004050187W WO 2004080074 A1 WO2004080074 A1 WO 2004080074A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- indication
- transmitter
- received
- locale
- Prior art date
Links
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
- H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
- H04H60/49—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations
- H04H60/51—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations of receiving stations
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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
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
- G11B19/122—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark involving the detection of an identification or authentication mark
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
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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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
- H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
- G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/14—Determining absolute distances from a plurality of spaced points of known location
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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
- H04H60/16—Arrangements for conditional access to broadcast information or to broadcast-related services on playing information
-
- 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
- H04H60/17—Arrangements for conditional access to broadcast information or to broadcast-related services on recording information
-
- 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
- H04H60/19—Arrangements for conditional access to broadcast information or to broadcast-related services on transmission of information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91321—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy protection control signal, e.g. a record inhibit signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91335—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a watermark
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/781—Television signal recording using magnetic recording on disks or drums
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/84—Television signal recording using optical recording
- H04N5/85—Television signal recording using optical recording on discs or drums
Definitions
- Copy protection protects the owner of copyright material, such as entertainment material, from unauthorized distribution of the material. Purchasers of copyright material, however, expect to be able to copy the purchased material for their own convenience and enjoyment. Standards and techniques continue to evolve to provide copy protection systems that allow purchasers of protected material to freely copy the material, yet still provide the owner of the protected material some protection from widescale distribution.
- One solution to this problem is to restrict distribution of content to a certain geographical region, for example one country.
- a DVD disc bought in the United States for instance can generally not be played back on a DVD player bought in Europe.
- a similar situation occurs for broadcasted content.
- STBs The device or service that is required to access the content can only be bought in a certain region. This method is used by Canal+ to limit the reception of Dutch television to the Netherlands (you have to buy the STB in the Netherlands and use a non-international phone call in order to activate you subscription). It would be desirable if the device required to access the content can be purchased anywhere, yet will only accept content in the correct geographical area. For this to work, the device must know its locale. Options to achieve this range from a user setting to implementing a GPS receiver in each device. However, allowing the user to manually enter the location is not secure enough and a GPS receiver is too expensive.
- This object is achieved according to the invention in a transmitter for transmitting a signal for reception by a receiving device, the transmitter being arranged to insert an indication of a geographical region where the signal physically can be received.
- This object is achieved according to the invention in a receiving device for receiving one or more signals, each of the signals carrying an indication of a respective geographical region where the respective signal physically can be received, the device being arranged to determine its locale from said indications.
- the geographical region can be encoded in a variety of ways. Preferred solutions are to use the power level to be used for the transmission of the signal, or to indicate the geographical region using geometrical shapes, e.g. one or more rectangles. At the transmitting side it is possible to quite accurately determine in advance in which geographical region the transmission can be physically received. An indication of this region can then be inserted in the signal, for example in metadata such as a descriptor in a table in an MPEG transport stream, although many other options are also available such as watermarking. The receiver extracts the indication carried in the signal and determines therefrom its locale. Because the indication indicates the geographical region where the signal physically can be received, and the receiver has in fact received the signal, it follows that the receiver must be in this geographical region.
- the receiver may be coupled (e.g. via a home network) to one or more other devices. In that case the receiver can transmit its determined locale to the other devices so that these also learn in which region they are located.
- each of them may carry its own indication. It is possible that these indications differ, for example if the receiver is at a country border or if one indication is a subset of another. In that case the receiver needs to employ some protocol to evaluate the indications in order to determine its locale. Several embodiments of the invention provide such suitable protocols.
- the indication of the geographical region is a set of geometrical shapes, such as rectengles, circles on ovals.
- the receiver can then compute the intersection of the sets carried in the various signals it received as the geographical region it is in. This locale can then be stored in the receiver as one or more geometrical shapes as well.
- Content can carry an indication of a geographical region in which the content is allowed to be played back, recorded, retransmitted etcetera. Based on its determined locale the receiver can restrict access to such content. The receiver then compares the indicated region with its own locale and will refuse to play, record or retransmit the content if the two do not match. If the indications are sets of geometrical shapes, refusal occurs if the intersection of the sets is the empty set.
- Fig. 1 schematically shows a transmitter for transmitting a signal for reception by a receiving device
- Fig. 2 shows another embodiment in which the transmitter receives the signal from another transmitter
- Fig. 3 shows a set of rectangles representing the geographical regions of the Netherlands (NL), Belgium (BE), Danmark (DK) and Germany (DE);
- Fig. 4 illustrates the computation of an overlap area;
- Fig. 1 schematically shows a transmitter 110 for transmitting a signal 120, preferably a broadcast signal, for reception by a receiving device 130.
- the transmitter 110 is arranged to insert into the signal 120 an indication of a geographical region where the signal 120 physically can be received.
- the term "transmitter” is used broadly as any device or system that can transmit a signal to a recipient. Possible embodiments include analog or digital television broadcasting systems or cable networks. Determining where the signal 120 can be received physically can be done in a variety of ways. A straightforward method is to employ a receiver that moves around in the area around the transmitter, and to record where the receiver still can and can no longer receive the signal. Based on data like the height of the antenna, transmitter power level and terrain data it is also possible to compute the area that will be covered by the transmission. For more information the reader is referred to handbooks such as R. E. Collin, Antennas and radio wave propagation, McGraw-Hill Higher Education; 4th edition, February 1985; M.P.M. Hall, Propagation ofradiowaves, IEEE Publishing, November 1996; CH. Papas, Theory of electromagnetic wave propagation, Dover Pubns, October 1988; or D.S. Jones, Methods in EM wave propagation, Clarendon Publishing, September 1995.
- Receivers that comply with the DVB standards can be provided the region information as part of the DVB signals.
- the signals they depend on are only available in a very specific area (DVB-C: a city, DVB-IPI: an address).
- This information can be provided to the device.
- This information can be provided using service provider- specific protocols or by embedding the location information into the streams received by the receiver in the same way as for satellite and terrestrial receivers.
- the location of the devices connected to a non-IPI network can be determined by providing info ⁇ nation in the signals they are receiving. In the case of DVB-C devices this is the location of the cable network (always one area). For DVB-T receivers the location can be determined from the signals they can receive (typical multiple areas). It is more difficult for DVB-S devices as the area in which the signals can be received is huge. But still, an estimate can be made.
- the BBC provides on its Website at www.bbc.co.uk/reception/tv_transmitters/index.shtml an overview of main transmitters for use in the DVB-T system in the UK. Using the information on the Website it is possible to determine the position within approximately 150 km. When relay stations are used, an accuracy of say 40 km can be reached.
- Fig. 2 shows another embodiment in which the transmitter 110 receives the signal 120 from another transmitter 210.
- transmitter 110 may be retransmitting satellite signals over a cable network.
- the original signal 220 then contains an indication of the geographical region in which it can physically be received.
- the transmitter 110 should now replace in the signal 220 this original indication with the indication of the geographical region in which the retransmitted signal 120 can be received.
- the head-end transmitter receives the original signal 220 from the other transmitter 210 and must update the region indication in the signal 220 before retransmitting it as signal 120. More specifically the head-end may replace a "wide" region indication (such as "European Union” or “United Kingdom”) with a more narrow region which it specifically covers (e.g. "London” or "Wales").
- the indication where the signal 120 physically can be received can be present in the content for example using a watermark or in a side channel. If an MPEG transport stream is used, the indication can be inserted in a table, either an existing table or a newly added table. For instance the Transport Stream Description Table (TSDT) or the Network Information Table (NIT) can be used.
- TSDT Transport Stream Description Table
- NIT Network Information Table
- Location can be encoded in many ways. It can be done in a coordinate system or using human readable variants like: * EU, NL, Eindhoven, Prof.Holstlaan, WY o EU, FR, Tarn, Albi, Carmaux, Pampelonne, Lunaget, LeLabot ⁇ EU, NL, Lopik
- the location can be encoded as one region indication or as a set of region indications, for example "England, Wales”.
- R indicates the geographical region around transmitter i
- P t , r, ⁇ is the broadcast power of transmitter i
- P rev is the received power of transmitter i.
- the transmitter 110 inserts its broadcast power level to be used for the transmission of the signal 120 in the signal together with an indication of its location.
- the receiver 130 can read out this information from the signal 120 and apply the above formula to estimate the distance between transmitter 110 and receiver 130. That distance and the location of the transmitter 110 give the receiver 130 an estimate of its locale.
- the receiver 130 must also comprise means to determine the received power of the transmitter 110.
- the shapes using straight lines allow for the easiest computation.
- the circular shapes best match the areas of covered by radio signals. Due to curvature of the earth, especially for large areas, the trapezoid is a better shape than the rectangle. It gives a reasonable approximation of the area covered between two longitude and two latitude values.
- Fig. 3 shows a set of rectangles representing the geographical regions of the Netherlands (NL), Belgium (BE), Danmark (DK) and Germany (DE).
- the receiver 130 can determine its locale by simply storing this set of rectangles in a local memory. If the receiver 130 is connected to another device, the receiver 130 can then transmit the set to that other device. This way, for example a residential gateway can inform all devices in a household what their locale is.
- the receiver 130 may subsequently receive content carrying an indication of a geographical region in which the content may be accessed. For example, a movie may be broadcast solely for reception in the Netherlands. The receiver 130 may then access the content only if the geographical region indicated in the content overlaps with the locale it determined it is in.
- the indication of the region in which the content may be accessed is preferably also provided as a set of geometrical shapes approximating the region. If the locale was determined as the set of rectangles or other geometrical shapes mentioned above, overlap can be determined by simply computing the intersection of the stored set of shapes and the set of shapes carried in the content.
- the indication can be present in the content for example using a watermark or in a side channel. If an MPEG transport stream is used, the indication can be inserted in a table, either an existing table or a newly added table. These options are discussed below.
- the receiver 130 is likely to receive multiple signals from multiple different transmitters. As a result, it is to be expected that the receiver 130 will also receive multiple different indications of different geographical regions. For example, the receiver 130 could be at the Dutch/Belgian border and receive signals from both Dutch and Belgian transmitters, each indicating their respective countries. Another possibility is that one signal is received indicating for example the entire United Kingdom and another indicating the principality of
- - Compute the overlap of the various indicated regions, for example by computing the intersection of all received geometrical shapes -
- All options using the power of the signal require that the power of the transmission is included in the metadata and that the receiver has to measure the power of the received signal.
- the largest number of channels relies on a homogeneous distribution of channels over a certain area which is not true.
- the preferred solution is to determine the overlap area for the different signals. This is easier in the case that the area a signal can be received in, is coded in rectangles. Also in case circles are used to estimate the reception area, rectangular solutions provide reasonable solutions.
- Fig. 4 illustrates the computation of an overlap area.
- the receiver 130 has received a number of indications, graphically represented as circles in Fig. X. The intersection between all circles is indicated in black.
- This overlap area has been computed and is indicated with hashing. This overlap area was computed as a rectangle with upper left corner (x le j ⁇ , y up ) and lower right corner (x ⁇ ghts Y ⁇ own) although many other ways to express rectangles are of course possible. To compute these coordinates the following formula is used:
- Ydown max(y ⁇ - R t ) where i and yi are the X and Y coordinates of circle i and R! is the radius of circle i.
- a preferred embodiment focuses on signals in the form of the MPEG-2 transport streams, more specifically, DVB signals.
- the information can then be coded into the stream as a new table or as a descriptor in an existing table.
- a new table especially for location information has advantages and drawbacks.
- a special table is useful in the case that the amount of information to be carried is large, to manage the overhead specific for this information and/or for easy remultiplexing.
- the NIT or TSDT are the best candidates.
- the location information is very stable and will not change often. The same is true for the NIT and TSDT information. So it makes sense to add the location information to the NIT information table and/or to the TSDT table, thereby avoiding the need to add another table and to transmit the location information too frequently by adding it to an often-repeated table.
- the reception area is best described according to the table below:
- the signal 120 may comprise additional information representing geographical regions where signals to be transmitted by other transmitters physically can be received.
- the receiver 130 in this case should determine whether it can receive those signals from those other transmitters. If not, then these geographical regions should not be included in the locale the receiver 130 determines. If those signals cannot be received, the receiver 130 apparently is not in the region where such signals can be received.
- geometrical shapes representing these geographical regions can be subtracted from the geometrical shapes in the signal 120 representing the region where the signal 120 transmitted by the transmitter 110 physically can be received.
- the term “accessing” includes any and all processes that access and process the content material, including but not limited to: copying, playing, displaying, and so on.
- the term “copying” includes any and all processes that produce a copy of the content material in any of a variety of forms, including storing the material, providing the material on a removable storage device, transmitting the material to a remote device, and so on.
- any reference signs placed between parentheses shall not be construed as limiting the claim.
- the word “comprising” does not exclude the presence of elements or steps other than those listed in a claim.
- the word “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
- the invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Security & Cryptography (AREA)
- Databases & Information Systems (AREA)
- Circuits Of Receivers In General (AREA)
- Radio Relay Systems (AREA)
- Television Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/547,325 US20060195885A1 (en) | 2003-03-04 | 2003-03-04 | Transmitter and receiver for determing locale |
EP04716298A EP1602234A1 (en) | 2003-03-04 | 2004-03-02 | Transmitter and receiver for determining locale |
JP2006506666A JP2006522535A (en) | 2003-03-04 | 2004-03-02 | Transmitter and receiver to determine location |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45191903P | 2003-03-04 | 2003-03-04 | |
US60/451,919 | 2003-03-04 | ||
US48455503P | 2003-07-02 | 2003-07-02 | |
US60/484,555 | 2003-07-02 | ||
EP03104640 | 2003-12-11 | ||
EP03104640.2 | 2003-12-11 |
Publications (1)
Publication Number | Publication Date |
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WO2004080074A1 true WO2004080074A1 (en) | 2004-09-16 |
Family
ID=32966087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/IB2004/050187 WO2004080074A1 (en) | 2003-03-04 | 2004-03-02 | Transmitter and receiver for determining locale |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1602234A1 (en) |
JP (1) | JP2006522535A (en) |
KR (1) | KR20050105269A (en) |
WO (1) | WO2004080074A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100396131C (en) * | 2004-10-28 | 2008-06-18 | 株式会社泛泰 | Method and apparatus of restricting data access |
DE102006052591A1 (en) * | 2006-11-08 | 2008-06-26 | Technisat Digital Gmbh | Radio receiver, for subscribers in a building, has an additional antenna for the reception of radio and satellite position data signals |
US7530088B2 (en) * | 2005-09-20 | 2009-05-05 | International Business Machines Corporation | Topology based proximity validation for broadcast content |
GB2466049A (en) * | 2008-12-10 | 2010-06-16 | Symbian Software Ltd | Distance determination between two or more communicating devices |
Citations (2)
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EP0915631A2 (en) * | 1997-08-22 | 1999-05-12 | Nokia Mobile Phones Ltd. | A method for detecting the home area in a mobile station and a mobile station |
EP0997808A2 (en) * | 1998-10-29 | 2000-05-03 | Datum, Inc. | Controlling access to stored information |
-
2004
- 2004-03-02 WO PCT/IB2004/050187 patent/WO2004080074A1/en not_active Application Discontinuation
- 2004-03-02 EP EP04716298A patent/EP1602234A1/en not_active Withdrawn
- 2004-03-02 KR KR1020057016346A patent/KR20050105269A/en not_active Application Discontinuation
- 2004-03-02 JP JP2006506666A patent/JP2006522535A/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0915631A2 (en) * | 1997-08-22 | 1999-05-12 | Nokia Mobile Phones Ltd. | A method for detecting the home area in a mobile station and a mobile station |
EP0997808A2 (en) * | 1998-10-29 | 2000-05-03 | Datum, Inc. | Controlling access to stored information |
Non-Patent Citations (1)
Title |
---|
EUROPEAN BROADCASTING UNION: "DIGITAL RADIO MONDIALE", ETSI ES 201 980, July 2002 (2002-07-01), SOPHIA ANTIPOLIS, pages 1 - 194, XP002282984 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100396131C (en) * | 2004-10-28 | 2008-06-18 | 株式会社泛泰 | Method and apparatus of restricting data access |
US7530088B2 (en) * | 2005-09-20 | 2009-05-05 | International Business Machines Corporation | Topology based proximity validation for broadcast content |
DE102006052591A1 (en) * | 2006-11-08 | 2008-06-26 | Technisat Digital Gmbh | Radio receiver, for subscribers in a building, has an additional antenna for the reception of radio and satellite position data signals |
DE102006052591B4 (en) * | 2006-11-08 | 2017-11-02 | Technisat Digital Gmbh | Listening to the radio unit |
GB2466049A (en) * | 2008-12-10 | 2010-06-16 | Symbian Software Ltd | Distance determination between two or more communicating devices |
Also Published As
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KR20050105269A (en) | 2005-11-03 |
EP1602234A1 (en) | 2005-12-07 |
JP2006522535A (en) | 2006-09-28 |
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