KR100576529B1 - Method and Receiver for Geographic Selection of Digitally Encoded Messages - Google Patents

Abstract

A method of selecting a region according to a region of a digitally encoded message transmitted by various broadcasting stations and including positional information, where the positional information is compared with selection information according to the position of the receiver in the receiver. Transmit selection information, which information is compared at the receiver to position information included in the message.

Description

Method and receiver for geographic selection of digitally encoded messages

The present invention relates to a receiver having a selection method and a selection device according to a region of a digitally encoded message, which is transmitted by various broadcasting stations and includes position information, which position information is compared with selection information according to the position of the receiver in the receiver. It is about.

Traffic broadcasts to obtain traffic information for motorists have long been conducted. Such traffic broadcasting has disadvantages such as being too late or manually collecting information and thereby subjecting itself to the information being delivered again. As a result, motorists may already be congested before they notice traffic congestion on the air, and they may experience relatively quiet traffic when they actually go there despite traffic jams. In the last few years, digitally encoded traffic broadcast transmission systems have enabled accurate traffic identification and rapid delivery.

The composition, coding and regional listing of traffic broadcasts are defined in ENV 12313-1, ENV / 278/7/3/004 CEN, which is based on the July 1996 Standard Proposal ALERT C published by the RDS ATT ALERT Consortium. . According to this, the actual components of traffic broadcasting are the area of occurrence (location) and the events (events) that occur and a list of these components is made. That is, all traffic areas and events are assigned to each code. Linking the areas in the area list along an existing road is a progression. Traffic Broadcast Channel The use of TMC (Traffic Message Channel) requires devices for decoding, storing, processing, and transmitting traffic information in addition to a general receiver with an RDS decoder.

Digitally encoded traffic information (hereinafter referred to as TMC-information) can be transmitted using a Radio-Data-System (RDS), which can simultaneously transmit broadcast programs and digital data on one data channel. Radio-data-system specifications for UKW radios are specified in document Tech, 3244-E of the European Radio Union (EBU) in March 1984. A message receiver with an appropriate RDS-decoder can receive and decode voice and transmitted data from the same receiver.

With the introduction of the TMC system, a lot of TMC broadcasts are expected, but only a few are needed by the driver. Thus, the actual quality criterion of future digitally encoded message receivers should be able to protect the driver from the flood of information by filtering out or selecting only the information needed by the driver from a very large number of received information.

Therefore, the selection according to the position is very useful, and the position recognition of the receiver, that is, the vehicle, is essential. Several methods are known for positioning (approximate location if necessary). For example, there is a method of manually inputting location and location information manually, although it is an inefficient and cumbersome method for long distance driving. The method of combining an RDS / TMC-receiver with a satellite navigation system (eg GPS) requires technical skills and is therefore costly.

1 is a circuit diagram of a receiver in accordance with the present invention.

2A and 2B are data block diagrams containing selected information.

3 is a diagram of a vehicle driving through several transmission ranges and TMC region.

4 is a received selection information analysis diagram.

5 is a broadcast selection diagram based on received selection information.

The object of the present invention is to enable selection according to the position with the least technical skill possible without further manipulation.

In the method according to the present invention, this problem is solved by a broadcasting station transmitting selection information unique to a transmission area, and comparing the selection information with position information included in a message at the receiver.

The method according to the invention is simply to use the data present for the decoding of the message in the receiver. Although less accurate than satellite navigation systems, it is sufficient for broadcast selection. In the method according to the present invention, it is very important to change the frequency or program information code of a broadcasting station when the selection information transmitted from the broadcasting station is kept intact.

The advantage of this method is that it can be used with a receiver which automatically searches for channels and finds the best station among the desired programs according to the reception status. When a device equipped with the TMC tuner receives multiple TMC broadcasts There is an advantage that one broadcast can be selected based on the selection information, in particular, the location code of the region. For example, if the system informs the driving target point, the TMC-service belonging to the target point can be selected, so that all information along the driving route can be selected. This method also does not require any specific RDS and can therefore be transmitted to other broadcast media such as DAB and AMDS.

In a first embodiment of the method according to the invention, the selection information is a location code of a region defined for coding and decoding of a message, which region is at least partly within the transmission region. Since all areas defined for coding and decoding of messages are based on location codes, the receiver can use these location codes (area codes) directly as selection criteria. That is, only broadcast information in which the primary or secondary location information of the message exists in the plane defined by the location code may pass through the filter.

In a second embodiment of the method according to the invention, the selection information is the coordinate and radius of the transmission area. In this case, the radius simply indicates the transmission area of each broadcaster. In order to utilize this selection information in the receiver, the local coordinates must be stored for every location code in the regional list. This is also a prerequisite for a graphical representation of the traffic situation, so this data is often already on the regional list and can therefore be used further in this method.

In the case of a broadcasting station having a large transmission area, the second method may be more useful depending on the situation because it is one of two methods of broadly representing the transmission area or dividing it into small areas. Each code requires 16 bits of transmission capacity.

If the broadcasting station transmits the selection information applied to the broadcasting station, respectively, the accuracy is greatest. Another application form according to the invention is also possible. That is, the same selection information is transmitted by a group of broadcasting stations.

In this method, the selection information and the reference information for the selection information are transmitted in a system message of a data stream containing a digitally encoded message. In particular, ALERTC's TMC-signals each hold four system messages, which are distinguished by the first two bits of each block C. The first variable of code 00 is used to transmit selection information. In this case, firstly, subsequent information, that is, selection information, is transmitted in the first data block, and the region list number and information on the type of selection information required for decoding the message are transmitted by the receiver.

Ultimately, when transmission of the position code, coordinates, and radius is possible, in this application form, the information about the type of selection information in the first data block indicates whether the selection information is composed of the location code of the region or the coordinates and the radius. This means that one bit is transmitted. In the case of location code transmission it is very useful if it is transmitted how many location codes of the area are followed in the first data block. In this case, one location code of one region may be transmitted in at least one second data block.

In the case of selection information consisting of a radius and coordinates, the application format according to the present method may be configured in such a manner that a radius is transmitted in the first data block and a coordinate is transmitted in the second data block.

In a receiver of the present invention having a device for digitally encoded message selection, which is transmitted by various broadcasting stations, includes position information, and is selected according to selection information according to each position of the receiver in the receiver, it is transmitted by the broadcasting station and is transmitted by each broadcasting station. An object of the present invention is solved by using a receiver including a device for receiving selection information indicating a transmission area of a device and a device for comparing the selection information with position information included in a message.

When receiving selection information overlapping with each other from various broadcasting stations using the application format of the receiver of the present invention, the selection information set common to the received selection information is used for the selection, thereby reducing the range of the selection area.

The antenna 1, the receiver 2, the stereo decoder 4, the NF amplifier 5, the output amplifiers 6 and 7, and the speakers 8 and 9 are shown in FIG. The stereo multiplex signal emitted from the receiver 2 is transmitted to the RDS decoder 3 in addition to the stereo decoder 4, and the output is connected to the microcomputer 13. The microcomputer 13 performs decoding, management, processing and the like for controlling the receiver and selecting and reproducing the TMC broadcast. The keyboard 14 and the display 15 are connected to the microcomputer 13. The selected TMC broadcast is output to the display 15 or voice. For this purpose, the microcomputer 13 is connected to the input unit 10 of the NF amplifier 5 through the sound synthesizer 16.

2A and 2B show respective system messages composed of two blocks C and D according to respective TMC specifications, and the first two bits are set to 00. This means a system message used for the transmission of the selection information as shown in the embodiment. In addition, you can use block C 30 bits. The six bits following 00 indicate the position table number LTN. According to the TMC specification, various regional lists are possible and the method according to the present invention has been considered an advantage.

Then, three bits are given as an extended service characteristic, which enables a more accurate representation of the service. If more than one broadcast has been transmitted recently, the next bit (ntr = no report) is set to zero. On the other hand, 1 means no broadcast error. The next bit specifies the type of selection information. In this case, 0 means that the next 19 bits have one index and one location code. 1 means that the next 19 bits have geographical coordinates and one radius. Finally, there is a 3-bit IDX, which indicates how many of up to eight different location codes have been transmitted.

Next, in the 16-bit data block D, the location code, that is, the location code of the area existing in the region list named in the LTN, is transmitted.

The selection information is transmitted in the form of geographical coordinates and a transmission area, and the bit CID (coordinate ID) is set to 1 according to FIG. 2B. Bit IDX is then used for transmission of the radius. For example, 000 = 30km to 111 = 240km in 30km increments. X-coordinates and Y-coordinates are transmitted in 8 bits in the second data block D, respectively. This divides the regions in the region list into 256 x 256 fields and then assigns them on the X- and Y-axes.

3 shows a driving route of a vehicle moving from point A to E. FIG. The car then reaches the transmission zones of stations x, y, and z and passes through areas G1 through G7. At the beginning of operation, the car passes the transmitting area of station x. This transmission area covers the location codes G1 to G6, so all broadcasts in this area can be selected. At point B, the receiver is switched to station y, which is better received. G2, G3, G5 and G6 are transmission regions. In this case, the receiver reduces the selection range to the G2 and G3 areas and outputs only this area broadcast compared to the area of the still-receivable station x.

At point C, the car leaves the broadcast zone y and enters the broadcast zone z. Although the reception is weaker than station x in this region, the receiver selects the z broadcast because the target point E is in region G7 and has designated station z in this region. Subsequently, only the broadcasts in the overlapping regions of x and z, G3 and G4, are available for selection. Since point X cannot be received from the point D, the broadcast in the target area is selected.

4 is a diagram illustrating a process of analyzing reception selection information (hereinafter, a selection code). Starting at 21, groups 8A at 22 are called and decoded. At 23, a branch occurs depending on whether the group selection code SC is present. If no, it is a normal TMC broadcast, which is decoded at 24 and selected by a selection table in memory at 25. This selection table is generated by the selection code previously received.

Then at 26 it is checked for another 8A group, if not at 27 the program is terminated.

If there is an 8A group, program 22 is called and decoded in program 22, and then at 23 again the group selection code SC is checked. If yes, then check at 28 whether the bit CID (FIG. 2) is zero or one. If the bit CID is zero then the selection code holds the location code and at 29 the selection table is implemented. If the CID is 1, coordinates are received as a selection code in the same 8A group, and a selection table of coordinates received at 31 is implemented.

After 29 or 31, the program branches at 32, depending on whether or not broadcast resource M is zero. In the case of 'No', broadcasting information exists in the memory, and selection is performed at 25 using the already created selection table. If there is no longer broadcast information, it branches to 26.

5 shows the progress of selecting a broadcast based on the received selection code. After starting at 41, the group 8A, corrected for errors and identified, is called at 42. Next, at 43, a branch occurs depending on whether the selection is active or if the user has set the selection. If no, the broadcast is marked as optional at 44 as in other cases. Then at 45 the program ends. If selection is activated at 43, then at 46 the selection table is checked for retention. If no, then at 47 it is checked whether the location code LC contained in each processed broadcast is assigned to the location code AC. If yes, the broadcast is marked as optional; if no, 49 is marked as not selected.

At 46 the coordinates of the selection table are checked and at 50 the coordinates COORD belonging to each position code LC are identified. Then at 51 the region L branches according to whether it is outside of region A defined by the coordinates held by the selection table. If the location is not outside the area, the program proceeds to 47. However, if the location is outside of the area, then at 49 it is marked as not selected.

Claims (12)

A method of geographical selection of digitally encoded messages, wherein the messages are broadcast by a plurality of stations and include specific location information, the location information being selected in receivers depending on the location of each of the receivers. In the selection method, which is compared with the information, The broadcasting station also broadcasts selection information specifying a transmission zone, the selection information being compared with location information included in the messages at the receiver. 10. The method of claim 1, wherein the selection information is a location code of a region defined for coding and decoding of the message and at least partially within a transmission area. The method of claim 1, wherein the selection information is a coordinate and a radius of a transmission area. 4. Method according to any one of the preceding claims, characterized in that the same selection information is transmitted by a group of broadcast stations, respectively. The digitally encoded message according to any one of claims 1 to 4, wherein the selection information and reference information for the selection information are transmitted in a system message of a data stream comprising a digitally encoded message. Geographic selection method. The method according to claim 5, wherein, as subsequent information, an identifier indicating that selection information is transmitted, information about a region list number necessary for decoding a message at the receiver, and information on the type of selection information is transmitted to the first data block. Method of geographic selection of digitally encoded messages. 7. The method of claim 6, wherein the information about the type of selection information is transmitted to the first data block by one bit indicating whether the selection information is composed of a location code of a region or a coordinate and a radius. And geographical selection method of the digitally encoded message. 8. The method of claim 7, wherein information indicating how many location codes of an area is followed is also sent to the first data block. 9. A method according to any one of claims 6 to 8, wherein one location code of one area is transmitted in at least one second data block. 9. The method of claim 6, wherein the radius is transmitted in a first data block and the coordinates are transmitted in a second data block. 10. A receiver having an apparatus for selecting digitally encoded messages, the messages being broadcast by a plurality of broadcast stations and selected at the receiver in accordance with selection information that includes specific location information and depends on the location of each of the receivers, In the receiver, And a device for receiving selection information transmitted by each broadcasting station and specifying a transmission area of each broadcasting station, and a device for comparing the selection information with position information included in the messages. Receiver with a device for selecting the sound. 12. The method according to claim 11, wherein when receiving selection information overlapping each other from a plurality of broadcasting stations, a selection information set common to the received selection information is used for the selection. Receiver with the device.