KR100473900B1 - Wireless broadcasting system, wireless broadcasting transmitter and receiver, wireless broadcasting method and wireless broadcasting signal - Google Patents

Abstract

A wireless broadcast system, a transmitter, a receiver, a wireless broadcast method and a signal are provided, wherein the program signal is combined with a data signal. According to the invention, the data signal includes not only the indicated program signal but also information about the data service, such as data of the data service, identification of the data service, alternative frequencies, information about related data services, and the like. In this way, the data service can be broadcast through a network different from the network broadcasting the program signal. This is especially used in wireless data systems.

Description

Wireless broadcast systems, wireless broadcast transmitters and receivers, wireless broadcast methods and wireless broadcast signals

The present invention relates to a wireless broadcast system comprising a transmitter and a receiver for transmitting and receiving radio data system (RDS) signals comprising at least one program signal and a data signal having information on the indicated program signal.

The present invention relates to a wireless broadcast transmitter for transmitting radio data system (RDS) signals comprising at least one program signal and a data signal having information on the indicated program signal.

The invention also relates to a radio broadcasting system receiver for receiving radio data system (RDS) signals comprising at least one program signal and a data signal having information on the indicated program signal.

The invention also relates to a radio broadcast method for transmitting and receiving radio data system (RDS) signals comprising a data signal having information on at least one program signal and an indicated program signal.

Such a radio broadcast system is known from the specification of Radio Data System (RDS), published in April 1992 by CENELEC under reference EN 2050067: 1992. In this FM radio broadcasting system, a program signal is frequency modulated on a carrier, a data signal is modulated on a subcarrier of 57 kHz, and includes information about a program signal indicated in the data. The indicated program signal may be a accompanying program signal or a program signal related to the accompanying program signal. The information may comprise another network including identification of the network on which the indicated program signal is broadcast, alternative frequencies at which the same program signal may be received, and traffic information related to the network broadcasting the program signal. Linking information for switching to the network, and the like. In general, this information relates to the infrastructure for the same or related program signals. This means that when the data service is incorporated into the information of the data signal, the data service shares the same infrastructure as the program signal.

1 is a diagram of a wireless broadcast system in accordance with the present invention.

2 illustrates a wireless broadcast receiver in accordance with the present invention.

3A-3N illustrate RDS TMC groups containing additional information in accordance with the present invention.

4 is a first flow diagram for use in the present invention.

5 is a second flow chart for use in the present invention.

It is an object of the present invention to provide a wireless broadcast system in which the data service of the data signal is no longer limited to the infrastructure related to the program signal.

In a wireless broadcasting system according to the present invention, a data signal further includes data of a data service and information about the data service, and the group type code for distinguishing between data of different types of data signal is different. And groups having the same group type code are used to transmit data of the data service and information about the data service.

The transmitter according to the invention is characterized in that the data signal further comprises data of the data service and the information on the data service.

The receiver according to the invention is characterized in that the data signal further comprises data of the data service and information on the data service.

The method according to the invention is characterized in that the data signal further comprises data of the data service and information relating to the data service.

The signal according to the invention is characterized in that the data signal further comprises data of the data service and information on the data service. The present invention is based on the fact that by adding data of the data service together with the information about the data service to the data signal, the data service can be broadcast via a network of transmitters substantially different from the network broadcasting the program service. In this manner, for example, the area coverage for the data service may be different from the local broadcast range for the program signal. This increases the flexibility of service providers providing data services. The information about the data service may include identification of the data service, alternative frequencies over which the data service is also broadcast, information about the local broadcast range of the data service, and the like. In addition, data and information of a particular data service are grouped together using a group type code. This allows the receiver to recognize groups of data belonging to the data service simply and effectively. One example of such a code is a group type code used in a wireless data system.

One embodiment of a wireless broadcast system according to the present invention is that a group includes data bits to distinguish remaining data bits that include data of a data service or that contain information about the data service. It features.

This allows a simple way for the receiver to distinguish the data of the data service from the information about the data service.

An embodiment of the wireless broadcasting system according to the present invention is characterized in that the information on the data service includes information on related data services. In this way, the data service can be linked to other data services with associated data. It is now possible to collect the desired data that is eventually sent over some network on some data services.

An embodiment of the wireless broadcasting system according to the present invention is characterized in that the information on the related data service includes switching information for switching the tuning of the receiver to a frequency for receiving the related data service. This allows for reliable switching from one network with data services to another network that broadcasts the relevant data services. Such switching information may include alternate frequencies at which the related data service can be received, identification of the service provider providing the related data service, identification of the related data service, and the like. This switching information may also include trigger information for switching. In this case, the receiver can determine the moment when switching should occur and possibly even the switching period (if such information is provided).

The above objects and features of the present invention will become more apparent from the following description of the preferred embodiments with reference to the drawings.

In the drawings, like parts are provided with the same reference signs. In the flowchart, "Y" means that the block condition is met, and "N" means that the block condition is not met.

The present invention provides a system for transmitting data, which data is part of a data service. The present invention also provides a transmitter and receiver for use in such a system. The present invention also provides methods for transmitting and receiving such data. In addition, the present invention provides a signal comprising such data.

When transmitting a data service using a plurality of transmitters, it is desirable to allow the receiver to select the most powerful transmitter for the reception of the data service. For this purpose, the receiver needs to know alternative frequencies at which the data service can be received. It may also be desirable to provide extensive information about the provided data services. This allows the receiver to determine if the data service can be processed and / or if it is the desired data service. In addition, sometimes when a data service cannot provide all of the desired data, some of this desired data may be available over other networks. Thus, it is desirable to provide some kind of link to another network so that the receiver can be automatically switched to another network for receipt of the desired data, and then switched back to the original after reception. In general, the present invention provides a data service, which includes additional information about the data service. The additional information is information about the service itself, for example:

Identification of the data service,

Identification of the service provider,

May include local broadcast range identification of the data service.

The additional information may also provide information about frequencies at which the data service can be received, similar to the characteristics of the alternate frequencies provided in the RDS. This allows the receiver receiving the data service to find the best possible reception. The additional information may also provide link information that links the data service to other data services. This is useful in situations where the data service itself cannot provide all the necessary information, but can find lost information through other data services linked to the current data service. The invention is particularly useful in a system in which program signals and data signals are transmitted, which data comprises data of a data service. The data signal further includes program related information, such as information about alternative frequencies of the program, identification of the program, and the like. However, the program related information may not be useful for data services. Indeed, the service provider providing the data service may be entirely different from the program provider. In addition, the data service is different from the network of transmitters and can be transmitted via the network of transmitters transmitting the program signal. Thus, program related information cannot be applied to the data service, which means that the alternative frequencies provided in the program related information cannot be used to find the best reception of the data service. Accordingly, the present invention provides a data service that can be processed separately from the accompanying program signal.

1 shows a diagram of a wireless broadcast system according to the present invention. The system includes a transmitter 10 configured to transmit a data service and additional information about the data service. The transmitter is configured to transmit a program signal simultaneously. In this case, the data service is modulated on the subcarrier with appropriate modulation and added to the program signal before modulating the carrier. The system further comprises at least one receiver 11 and may comprise a plurality of receivers 11... The receivers are configured to receive the data service and additional information about the data service. The receiver 11 is configured to process data transmitted in the data service according to the data type identified by the data service or the data type of the additional information. In addition, the receiver 11 is configured to process additional information. Examples of this will be described later in the specification.

The system to which the present invention can be applied is a wireless data system. The wireless data system provides a data signal that is modulated on a 57 KHz subcarrier. The modulated subcarrier is frequency modulated on the carrier with the program signal. The data signal in the RDS is organized into groups of 104 bits each, each grouping into four blocks of 26 bits with 16 data bits and 10 bits reserved for checkwords and offsets. Divided. Each group has 37 free bits, 5 bits of the second block and 16 bits in each of the third and fourth blocks. These free bits can be used to transmit data. The other bits are already reserved. Groups are identified by a group identifier, a so-called Group Type Code with the second block. By the group type code including four bits, sixteen different group types can be identified. So far, each group type identifies an individual data service, some of which relate to programs and others that are not. The data services related to the program may be, for example, group forms 0 (basic tuning and switching information, providing ao alternative frequencies to the program), 1 (program item number, etc.), 14 (network containing the received program and other networks). Enhanced other networks that provide link information linking in. If the currently received network does not contain traffic information, the EON feature provides a method of switching to another network without traffic information). Data services not associated with the program are provided, for example, in group forms 5 (transparent data channel), 7 (wireless paging) and 8 (traffic message channel). For detailed information on RDS, see EN50067, "Specification of the radio data system (RDS)," published in April 1992 by CENELEC, Belgium, Brussels.

2 shows a radio broadcast receiver according to the present invention. The receiver 11 comprises receiving means 101 for receiving and demodulating information modulated on a carrier wave. The output of the receiving means 101 is coupled to a demodulation means 102 for demodulating a data signal which can be modulated separately on the subcarrier. The output of the demodulation means 102 is coupled to the controller 103 for processing the demodulated data signal. The controller 103 is coupled to the user interface 104 to receive commands and display auditory and visual information. The controller 103 is also coupled to the storage means 105 for storing data. In addition, the controller 103 provides the tuning information to the receiving means, and for receiving the tuning means (for example, a tuning indicator for indicating whether the receiving means 101 is properly tuned, the reception quality indication, etc.) 101). However, this is not essential to the present invention. The receiver of FIG. 2 is particularly suitable for receiving a frequency modulated carrier by a program signal and a data signal in the case of a data signal according to a wireless data system. The data signal in the system is modulated on the 57 KHz subcarrier.

In RDS, group type code 8 is reserved for data services, i.e. traffic message channels. In this group, coded traffic messages are transmitted, which can be decoded into visual and voice information at the receiver with the help of a database. The database includes information about traffic locations, traffic events in the form of visual and / or voice. Coded traffic messages are implemented according to the Alert C protocol and refer to the Proposed Pre-Standard "Alert C, Traffic Message Coding Protocol" published in November 1990 under the supervision of the RDS ALERT Consortium. In the example for the present invention, traffic messages according to the Alert C protocol are assigned to separate group type codes. However, if the group type code is shared with another protocol, such as Alert Plus, which is an extension / subsequent to Alert C, one bit needs to be reserved to identify the correct protocol. In this example, assume that only alert C messages are sent. Bit B4 of block 2 is now used as follows, where "0" identifies that the remaining 36 bits contain an alert C message and "1" identifies that the remaining 36 bits contain additional information. Since the present invention deals with additional information, alert C messages will no longer be described. When additional information is transmitted, when identified as B4 = " 1 ", bits B4 ... B0 include an address number to identify other portions of the additional information.

3A-3N show diagrams of RDS TMC groups containing additional information in accordance with the present invention. 3A shows three bits of five bits B4..B0 of the second block, sixteen bits C15..C0 of the third block, and sixteen bits D15..D0 of the fourth block. The remaining 37 free bits of the RDS group divided into parts are shown. The data identified by address number "0000" includes the following information (see Figure 3B):

Alternate frequency indicator AFI (1 bit). The alternate frequency indicator is set to "1" if the data service can use the alternate frequencies of the currently received program. If the list of alternate frequencies of the data service does not use the list of alternate frequencies of the currently received program, the AFI is set to "0".

Service identification SID (8 bits). The service identification serves to identify a service provider that provides a data service. The SID is designated by an authorized party.

Data type identifier DTI (11 bits). The data type identifier, or more precisely the data service identifier, functions to identify the data service. In the case of TMC, this is an identifier identifying the Alert C protocol or Alert Plus protocol.

Database number DB (6 bits). In the example of TMC, the database number identifies the database to which the data in the service belongs. The database is required for decoding traffic message locations and events, for example, and includes the conversion of coded traffic messages into visual or linguistic text. For other data services, the database may include the necessary decoding or conversion information needed to decode the data in the data service.

Service Profile SP1 (5-bit). In FIG. 3B one bit of SP1 is placed in block 3 and the other four bits are placed in block 4. The first bit of the five bits indicates whether the service is a pan-european service. The second bit indicates whether it is an international service, the third bit indicates whether it is a supra regional service, the fourth bit indicates whether it is a local service, and the fifth bit indicates whether it is a local or urban service. . These five bits can be set independently of each other, meaning that it can be a hyperregion and a country or any combination of the five possibilities. Therefore, service profile SP1 describes the local broadcast range of the basic TMC service.

-Generic link indicator GL (1 bit). If the bit is set to "0", no generic link is allowed. If the bit is set to "1", normal linking is allowed, which means that the current program with PI-code PQRS (where each character represents four bits) will generally link to programs with PI-codes PxRS. Where x is in hexadecimal notation and ranges from 4 to F.

Thus, the group with address "0000" provides additional information related to the data service itself. The information can be used to determine whether the received data service is correct. For example, if the service provider is not the expected person, then the data service may not be wholly expected, and vice versa. If the receiver does not have a database with the correct number, it cannot decode the data of the data service. If the user is interested in some local broadcast coverage of the service, for example a national broadcast coverage, the user may just not want a local data service. So these information items can all be used to select and / or identify data services.

Address "0001" may be reserved for transmitting alternative frequencies that the data service may also receive. If the data service has the same AFs as the accompanying program, the AFI is set to indicate that the AFs of the program can be used. However, if the AFs of the data service are not the same, or if there are more AFs than the program, the address "0001" provides the ability to transmit these AFs. With these alternate frequencies, the PI code of the program on the alternate frequency may be transmitted, which the check provides to the receiver to see if the correct program receiving the data service is received. The alternate frequencies transmitted with the address code are preferably not the alternate frequencies of the currently received program since the information has already been sent to the OA groups of the RDS. The method of transmitting alternate frequencies may be as defined for OA groups. Thus, the mapping of AFs is done in addition to adding the PI code of the received program at the second alternative frequency. Therefore, in FIG. 3C, block 3 includes a pair of two alternative frequencies, and block 4 contains a PI code belonging to a program received at another replaced frequency.

Addresses “0010” and “0011” in FIGS. 3D and 3E are respectively reserved for transmitting a total of eight 8-bit characters CHR1..CHR8 for display purposes, four characters in the 32-bit remaining data field for each address. Can be. These characters can be used to display the name of the service provider providing the data service, for example. In this way, it is similar to the characters of the program service name sent to the 0A and 0B groups of the RDS.

Address "0100" in Figure 3F may be used to send additional services, similar to SP1, service profile SP2 of TMC groups, where bit B4 is set to "1". Thus, the service profile may be different from the service profile SP1 of the basic TMC service (identified by bit B4 set to "0") but need not be implemented.

The addresses "0101", "0110", "0111" and "1000" (FIGS. 3I, 3J, 3G and 3H, respectively) may be reserved for transmitting information to link the data service to data services provided through other networks. Can be. The link is similar to the link provided by the EON feature of the RDS, but the EON feature relates only to the program signal contained in the data signal and is independent of the data service. Thus, the present invention provides an EON type feature for data services. Addresses “0101” and “0110” are reserved for information about data services on other networks. The data is substantially the same as the data in the group with address "0000", but is currently divided into two groups, similar to the contents of block 3 with address "0000" (SID, DB and 1 bit SP1). SID ', DB' and SP1 'of 1 bit are placed in block 3 with address "0101", and information DTI' and 4 bits similar to the contents of block 4 (DTI and 4-bit SP1) with address "0000". SP1 'is placed in block 3 with the address code "0110". Block 4 with addresses " 0101 " and " 0110 " both contain the program identification code PI (ON) of the other data network. Block 3 contains the NL0 and NL1 bits as the first bit, and these two bits Indicates a link type similar to those used in EON: If both bits are "0", no link is allowed.If NL0 = "1" and NL1 = "0", a normal link is allowed, which is GL. Similar to the regular link used in bits, this indicates that the second four bits of the PI code can have values in the range 4..F in hexadecimal notation, where NL0 = "0" and NL1 = "1". There is an extended generic link, and the last 4 bits of the PI code may have a value in the hexadecimal notation from 0 to F. If both NL1 and NL0 are "1", both generic and extended generic links are allowed. The address "0111", along with the PI code of another network PI (ON), is an alternate note for the other network Preferably, alternate frequencies are provided in the mapped pairs, one frequency AF (TN) of the pair is an alternate frequency of the current data service, and the other frequency AF (ON) of the pair is Alternative frequency of the data service in the other network to which the data service is linked, preferably the transmitters transmitting the frequencies in the mapped frequency pair have the same local broadcast range or location and range. The address "1000" may be reserved to provide timeslot information TS regarding the time that the data service of the other network is present, which is not only present in the network at all times but also at any moment. Because all the bits in the data field are used to provide this information. If not used, the remainder may be used to transmit the service profile SP2 'of the additional information sent to the other data service and the PI code PI (ON) of the other data service as well. By transmitting groups with addresses "0101", "0110", "0111", and optionally "1000", the receiver can successfully switch from the data network to another data network upon receiving a trigger indicating the switching moment. In order to have all the necessary information.

Addresses 1111 and / or 1110 may be used to provide a trigger. When the receiver has all the switching information and receives groups with addresses "1111" and / or "1110", the receiver will switch to the program identified by the PI code of another network carrying another data service. It is also possible to place the switching information partially in the data field of the groups with the trigger, ie the address "1111" (and / or "1110"). For this purpose, the address " 1111 " is reserved to provide two variants identified by the first bit of block 3. When C15 = "0", the remaining 31 bits of contents are the same as the last 31 bits of the group with address "0101". When C15 = "1", the remaining 31 bits of contents are the group with address "0110". Is the same as the last 31 bits of. If desired, the data field associated with address " 1110 " is the same for other addresses " 1111 ", whose service profile is different, which is the service profile of additional information of another data service. However, the data related to address "1110" is not essential, and address "1111" may actually be sufficient to provide some of the triggering and switching information.

4 shows a first flowchart for use in the present invention. The flow chart illustrates the selection of a service, where additional information is stored depending on whether the service matches the desired service. When the algorithm of FIG. 4 is implemented in the controller 103 of FIG. 2, the information can be stored in the storage means 105. Table 1 schematically illustrates the blocks of FIG. 4.

Table 1. Description of the blocks of FIG. 4

In block I, the RDS TMC service is selected. This choice can be made in a number of ways. The available services can be stored in memory (eg, by the manufacturer or by the user) and only the services of interest to the user can be selected. The receiver is capable of learning in that it stores all received services and builds a local database of data services. The user can later recall these services and select the services of interest. It can also be implemented dynamically, when a service is received, a user can provide it as a command to ignore or store or access the service. This may be done automatically by searching for a desired service or through a link to another data service, as will be explained in connection with FIG.

Next, in block II, the group type code of the service is determined. The block can be ignored if it is a designated group type code (and if the group type code of the data service is already known). The block may include reading the data type identifier table with these links to group type codes, as described in the applicant's co-pending application. However, this is not part of the present invention. After determining the group type code, the in-group data (and bit B4 set to "1") with the correct group type code is decoded in block III. The data in the group with the correct group type code, but this data set to "0" in B4 can be processed according to the appropriate (alert C) protocol. This is not relevant to the present invention and therefore is not dealt with in more detail. Next, in block IV, it is checked whether the address in the group is "0000". If the address is "0000", in block VII additional information about the data service is decoded, such as SID, DTI, SP1, DB and AFI (the meaning of these abbreviations described above). Following block VII, it is checked in block VIII whether the data service matches the desired or selected service. The check can be made based on the correct service profile SP1 / 2 or by the correct database DB or the like. In general, the check may include any or a combination of SID, DTI, SP1 (, SP2) and DB items. If the result of the check is yes (if the service matches the desired service), the temporarily stored data is kept at block X. If the result of the check is no, the temporarily stored data is deleted at block IX and the algorithm returns to the beginning. If the result in block IV is no (not an address of "0000"), it is checked whether the address is in the range of "0001" .. "1000". If no, the algorithm returns to the beginning and if yes the data in the group is decoded and temporarily stored at block IV. Of course, after determining that the service matches the desired service, it is possible to continue decoding the data in the group having the addresses "0001" .. "1000". However, the flowchart provides an example of how the selection of data services can be implemented at the receiver, for example one of FIG. 2. It is not the only possible way to implement such service selection.

5 shows a second flowchart for use in the present invention. In Table 2 a schematic description of the blocks of FIG. 5 is given.

Table 2. Description of the Blocks of FIG. 5

In block XI, it is checked whether a trigger has been received in the form of a group having the same address as “1111” or “1110”. If the result is no, the algorithm goes back to the beginning. If the answer is yes, then check in block XII whether the time Tmax has elapsed. This time Tmax is the maximum time to wait after first receiving a trigger but before switching to another network must occur. If the time Tmax has not yet passed, the trigger information in the group is decoded including the trigger. It is then checked whether all trigger information has been received at block XIV. This includes receiving all variations of groups with addresses "1111" and "1110". If the trigger information has not been completed yet, the algorithm returns to the beginning and proceeds to blocks XI, XII, XIII and XIV again until time Tmax has elapsed or until the trigger information is completed. Next, at block XV, the receiver is tuned to another network, indicated in the trigger information. In the case of a high-end receiver, the receiver switches directly to another network alternative frequency when it receives in the group with address "0111". For a low-end receiver that has no memory for alternate frequencies of another network, a search for a program containing a PI code of another network PI (ON) is initiated. If such a program is found, the algorithm goes to block XVI and trigger information (SID, DTI, DB, SP1 (SP2, if available), whether other networks are delivering the appropriate data services, etc., all of which Belong to the other network, which includes information about data services of other networks, by comparing in whole or in part with data in a group having an address "0000". Then, if the check is confirmed at block XVIII (and if another exact network is found), the trigger information is reset and the receiver goes to block XI and waits for new trigger information and a new trigger. This trigger information and the new trigger are supplied as additional information from the data service of the other network to switch the receiver back to the original network or back to another network. If the check is not confirmed (no other exact network was found), the receiver switches back to the original network. In this switching example, trigger information is supplied to the trigger group itself. It is also possible to receive in-group trigger information having addresses "0101" and "0110" (and "1000" if SP2 is required as trigger information). In that case, if the trigger information has been received as a whole, the switching can occur immediately or at a suitable moment without further decoding the trigger information in the trigger group. A suitable switching moment can be derived from the timeslot information in the group containing the address " 1000 " if necessary, which provides an indication of the time at which other networks will transmit related data. How this is implemented is not yet determined. More importantly, such information can be supplied in the present invention. The search for the program carrying the PI code PI (ON) may be affected by bits NL0 and NL1 provided to the groups having addresses "0100" and "0110", respectively (as described above). These bits indicate exactly how the PI code of the found program matches the PI (ON) received with additional information. The algorithm described here is of course only applied to the group that carries additional information to the currently received data service, ie the group with the correct group form and bit B4 set to "1". Thus, FIG. 5 shows an example of a possible realization for switching from a data service to another data service over another network. In this way, features similar to the EON features are provided.

The algorithms of FIGS. 3A-3N and 4 may be implemented in the controller 103 of the receiver, and the algorithm of the previous figure may be implemented. The current storage means 105 is used for storing data as in the case of block X of FIG. 4, for example. Moreover, in order to compare the trigger information with the decoded data from another network in the block XVI in FIG. 5, it may be necessary to store the decoded data. This may be done in the storage means 105.

In the given example, group form 8 was assumed to contain TMC. The assignment of data services to specific group forms is the subject of the applicant's co-pending application and is not particularly relevant to the present invention. This is also mentioned in connection with block II of FIG. 4.

In the previous example for the RDS TMC, generally speaking, it is illustrated how additional information related to the data network to which a particular data service is delivered is included in the group. This additional information enables extended identification of data services and service providers and also provides information for switching to alternative frequencies carrying the same data network or alternative frequencies of other data networks linked to the current data network. In this way, very flexible and dynamic data services are created and all the necessary additional information is provided in the same group as the data service itself, although it may certainly be possible to provide additional information in another group. However, this requires a method of linking the group with the data service to a group with additional information related to the data service, which is costly and reduces data capacity.

The algorithms of FIGS. 4 and 5 may be implemented in the receiver 11 of FIG. 2 in the controller 103. Of course, it may be possible to implement the algorithm in hardware.

Although the present invention has been illustrated using the RDS TMC data service, the present invention is not limited to this application. It can be applied to other data services of RDS. Moreover, the present invention is not limited in its application to wireless data systems and can be used in any system, where data services are transmitted through many transmitters, which may or may not belong to the same network. The present invention can also be applied to a system for providing a data service, which is linked to another network, which may be transmitted via another transmitter. Further, the present invention can be used in a system in which program signals and data signals are modulated on one carrier, and the data signals include data related to the program as well as data services. As can be readily seen, the modulation form (AM / FM, etc.) is not essential to the invention, as is the manner in which the program and data signals are combined for modulation on the carrier.

Claims (7)

A radio broadcasting system comprising a transmitter and a receiver for transmitting and receiving radio data system (RDS) signals comprising at least one program signal and a data signal having information about an indicated program signal, The data signal further includes data of a data service and information about the data service, wherein the data signal is organized into groups having group type codes for distinguishing different types of data, and the same group Groups with a form code are used to transmit data of the data service and information about the data service. The method of claim 1, And the group comprises data bits to distinguish remaining data bits containing data of the data service or containing information related to the data service. The method of claim 1, The information about the data service includes information about the related data service, and includes switching information for switching the tuning of the receiver to a frequency for receiving the related data service. , Wireless broadcast system. 12. A radio broadcast transmitter for transmitting radio data system (RDS) signals comprising at least one program signal and a data signal having information relating to an indicated program signal, And the data signal further includes data of a data service and information about the data service. 10. A radio broadcast receiver for receiving radio data system (RDS) signals comprising at least one program signal and a data signal having information about an indicated program signal, the radio broadcast system receiver comprising: And the data signal further comprises data of a data service and information about the data service. A radio broadcast method for transmitting and receiving radio data system (RDS) signals comprising at least one program signal and a data signal having information about an indicated program signal, the method comprising: The data signal further comprises data of a data service and information about the data service. A wireless broadcast signal comprising a data signal having information on at least one program signal and an indicated program signal, The data signal further comprises data of a data service and information about the data service.

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