JPH1075189A - Rds-receiving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an RDS(radio data system) receiving system in which a satisfactory receiving situation and traffic information can be obtained by writing all substitute station frequency and traffic information station frequency data transmitted, regardless of the kind of transmission system in a memory part, and shortening a retrieving time from the memory part. SOLUTION: An RDS receiving system, having an NF(network follow) function for changing the reception to a receivable substitute station according to the electric field strength of a receiving station, is provided with a memory part 13 in which all substitute station frequency data transmitted, regardless of the transmission system can be written. A data identifying part 12 which identifies the substitute station frequency data transmitted in the same block as one group, and allows the data to be written by group units in the memory part 13 is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an RDS receiving system, and more particularly, to an RDS for effectively utilizing an alternative station frequency and a traffic information station frequency transmitted from a receiving station.
The present invention relates to an S receiving system.

[0002]

2. Description of the Related Art In Europe, R is one of the systems for multiplex transmission of data mainly including broadcast-related information to FM broadcast waves.
DS (Radio Data System) has become popular, and RDS
Radio receivers that can use are becoming common.

[0003] The RDS is characterized in that each broadcasting station in the network transmits the frequency of the network station, that is, the alternative station frequency, and can change to the alternative station when its own reception condition deteriorates. It is characterized by being able to receive traffic information.

FIG. 9 is a block diagram schematically showing a conventional RDS receiving system.
Represents an antenna 71, an RF demodulator 72, an RDS demodulator 73,
It comprises a CPU 74 and a PLL synthesizer 79. The CPU 74 is provided with a data decoding error correction unit 7.
5, an AF (alternate station) identification unit 76, an AF memory unit 77, and an NF (network follow) / traffic information activation unit 78.

An RF for demodulating a radio wave received by the antenna 71
The output side of the demodulation section 72 is connected to the input side of the RDS demodulation section 73, and the output side of the RDS demodulation section 73 is connected to the input side of the data decoder error correction section 75. The output side of the data decoding error correction section 75 is connected to the input side of the AF identification section 76. After that, the data is passed to the AF identification unit 76.

[0006] The output side of the AF identification unit 76 is the AF memory unit 7
7, an AF identification unit 76 identifies the AF transmission method in the data, and
7 is written.

[0007] The output side of the AF memory unit 77 is connected to the input side of the NF / traffic information activating unit 78, and the output side of the NF / traffic information activating unit 78 is connected to the input side of the PLL synthesizer 79. The output side of the PLL synthesizer 79 is connected to the RF demodulation unit 72, and the NF / traffic information activation unit 7
In No. 8, an application for NF and traffic information is executed using data written in the AF memory unit 77.

The NF (Network Follow), which is one of the RDS functions, can transmit the frequency data of the substitute station up to 25 stations at a time on the FM broadcast wave, and the receiving side sets the threshold of the electric field strength of the receiving station to the threshold value. In the following cases, the electric field strength of the substitute station is checked and the reception is changed to a broadcast station that can be substituted.

As shown in FIG. 10, when the electric field strength of the receiving station becomes lower than the threshold value, the electric field strength of the substitute station 1 is checked.

[0010] Since the electric field strength of the substitute station 1 is also equal to or less than the threshold value, the process returns to the receiving station.

Next, the electric field strength of the substitute station 2 is examined.

In FIG. 10, since the electric field strength of the substitute station 2 exceeds the threshold value, the substitute station 2 is continuously received.

[0013] There are two types of alternative station frequency transmission systems, the A system and the B system, which differ depending on the broadcasting station. The A method transmits the substitute station frequency of its own station for up to 25 stations, and the B method
Up to 12 pairs of own station frequency and own station alternative station frequency
A maximum of 156 (= 12 + 12 × 1) totals for a maximum of 12 stations in which a station, an alternative station frequency, and the alternative station frequency are paired.
2) The station is transmitting.

[0014] The traffic information station frequency transmission method includes:
There are two types, the A type and the map type, which differ depending on the broadcasting station. The A system transmits a maximum of six traffic information stations, and the map system transmits the own station frequency and a traffic information station frequency that is linked in advance as a pair.

In the conventional alternative station frequency reception, the receiving side has only a memory unit capable of storing only 25 stations. In the case of the B system, all alternative station frequencies cannot be written in the memory unit. It was difficult to obtain a good reception situation. In addition, as for the reception of the traffic information station frequency, since only the memory unit for the normal A system is held, the traffic information station frequency could not be written in the memory unit even if the traffic information was transmitted by the map system.

[0016]

In the conventional receiving of the alternative station frequency, the receiving side has only a memory section for 25 stations, so in the case of the B system, all the alternative station frequencies are stored in the memory. In such a case, it is impossible to write data into the unit, and a maximum of 131 (= 156-25) stations cannot be written. Also, when receiving the traffic information station frequency, since only the memory section for the normal A method is held, the traffic information station frequency transmitted by the map method cannot be written in the memory section, and good traffic information cannot be obtained. There was a problem that there is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and writes all alternative station frequency and traffic information station frequency data to be transmitted irrespective of the type of transmission method in a memory unit, and further retrieves the data from the memory unit. It is an object of the present invention to provide an RDS receiving system capable of shortening time and obtaining good receiving conditions and traffic information.

[0018]

Means for Solving the Problems and Their Effects To achieve the above object, an RDS receiving system according to the present invention (1)
Is a memory unit that can write all alternative station frequency data transmitted regardless of the transmission method in an RDS receiving system having an NF function that can change the reception to an alternative station that can receive according to the electric field strength of the receiving station. And a data identification unit for writing the substitute station frequency data transmitted in the same block into one group and writing the data into the memory unit in group units.

According to the above-mentioned RDS receiving system (1), the contents of the alternative station frequency data transmitted in the same block have relevance, and are written in the memory unit as one group unit. When the alternative station frequency data for which search is prioritized is concentrated in one group, the group is searched for preferentially, so that the search time is shortened. Can be shortened.

The RDS receiving system (2) according to the present invention is the same as the RDS receiving system (1), except that
For F, an NF activation unit that preferentially searches for alternative station frequency data of the receiving station is provided.

According to the above-mentioned RDS receiving system (2), the alternative station frequency data of the receiving station having a high possibility of receiving is preferentially searched, so that the searching time can be shortened.

In the RDS receiving system (3) according to the present invention, in the RDS receiving system (1) or (2), after the receiving station is changed by the NF, the group of the alternative station frequency data including the receiving station frequency data is changed. It is characterized by including a memory unit that can be stored and an NF activation unit that preferentially searches for the group.

According to the above-mentioned RDS receiving system (3), the group of the alternative station frequency data including the frequency data of the receiving station includes the alternative station frequency data having a high possibility of receiving. The search time can be shortened by storing the group later and giving priority to the search later.

Further, the RDS receiving system (4) according to the present invention is capable of receiving traffic information of another network station.
In an RDS receiving system having an ON function, a memory unit capable of writing all of the traffic information station frequency data and the receiving station frequency data paired with the traffic information station frequency data from the transmitted data regardless of the transmission method is provided. It is characterized by having.

According to the above-mentioned RDS receiving system (4), since the memory unit capable of writing all transmitted traffic information station frequency data regardless of the transmission method is provided, all traffic information station frequency data can be stored. You can search and get good traffic information.

Further, the RDS receiving system (5) according to the present invention, in the above-mentioned RDS receiving system (4), retains the traffic information station frequency data and the receiving station frequency data which have already been written even after changing the receiving station. It is characterized by having a memory unit capable of storing.

According to the above-mentioned RDS receiving system (5), since data transmitted from other than the receiving station is also written in the memory section, more traffic information station frequency data can be searched, and good traffic information can be retrieved. Can be obtained.

Further, the RDS receiving system (6) according to the present invention is arranged so that, in the RDS receiving system (5), a traffic information station which is paired with the receiving station and has a high possibility of receiving is preferentially used. , An EON activation unit for preferentially searching for reception station frequency data.

According to the above-mentioned RDS receiving system (6), the traffic information station previously linked to the receiving station has a high possibility of receiving, so that the receiving station frequency data is preferentially searched for and the receivable traffic information can be received. By searching the station frequency data, the search time can be reduced.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an RDS receiving system according to the present invention will be described below with reference to the drawings.

FIG. 1A shows an RD according to the embodiment (1).
FIG. 2 is a block diagram schematically showing a CPU of an S receiving system. The CPU 10 of the RDS receiving system includes a data receiving unit 11, a data identifying unit 12, a memory unit 13, and an NF starting unit 14. The RDS demodulated signal is received by the data receiving unit 11, and the output side of the data receiving unit 11 is connected to the input side of the data identification unit 12. The output side of the data identification unit 12 is connected to the input side of the memory unit 13, and the output side of the memory unit 13 is connected to the input side of the NF activation unit 14.

The operation of the data identification unit 12 of the RDS receiving system according to the embodiment (1) configured as described above will be described with reference to the flowchart shown in FIG.

First, in step 1, k for the counter is set to −1, and then in step 2, 1 is added to k. Next, in step 3, alternative station frequency data is input from the data receiving unit 11 in group units, and then, in step 4, the data is written to the area k of the memory unit 13. Next, in step 5, it is determined whether or not writing of all the substitute station frequency data transmitted from the receiving station has been completed. If it is not completed, the process returns to step 2, and if completed, the operation ends.

The operation of the NF activation unit 14 of the RDS receiving system according to the embodiment (1) will be described with reference to the flowchart shown in FIG.

Reference numeral n indicates an area of the memory unit 13 to be searched, and reference numeral X indicates an area of the memory unit 13 in which a group including alternative station frequency data for which search is prioritized is written.

First, in step 11, n is set to X and k for the counter is set to -1.
The alternative station frequency data is read from the area n of the memory unit 13, that is, the area X in which the group including the alternative station frequency data whose search is prioritized is written, and the receivable broadcast station is searched. Then, it is determined whether there is a receivable alternative station. If there is a receivable alternative station, the process goes to step 19 to change the reception to a receivable alternative station. On the other hand, if there is no receivable alternative station, the process proceeds to step 14.

In step 14, it is determined whether or not all the substitute station frequency data written in the memory unit 13 has been searched. If not, go to step 15,
If the search has been performed, there is no alternative station that can be received, so that the operation is terminated without changing the reception.

In step 15, 1 is added to k, and then in step 16, it is determined whether or not k is equal to X. If they are not equal, the process proceeds to step 18, while if they are equal, the process proceeds to step 17, 1 is added to k, and the process proceeds to step 18.

In step 18, n is set to k, and the process returns to step 12.

Steps 16 and 17 are processing for not re-searching the area X of the memory unit 13 which has been searched preferentially.

According to the RDS receiving system according to the present embodiment (1), the contents of the alternative station frequency data transmitted in the same block are related to each other, and they are used as one group unit. Since the data identification unit 12 is designed to write the data in the area X of the memory unit 13 in which the group including the alternative station frequency data whose search is prioritized is written, the search time is reduced. Can be shortened. Even if there is no substitute station frequency data that can be a substitute station in the area X of the memory unit 13, a good reception condition can be obtained by searching the memory unit 13 in which all transmitted substitute station frequency data are written. Can be obtained.

Next, the operation of the NF activation unit 14 in the RDS receiving system according to the embodiment (2) according to the present invention will be described with reference to the flowchart shown in FIG.

Reference numeral n indicates an area of the memory unit 13 to be searched, and reference numeral Y indicates an area of the memory unit 13 in which a group including alternative station frequency data of a receiving station having a high possibility of receiving is written.

First, in step 21, n is set to Y and k for the counter is set to -1.
The alternative station frequency data is read out from the area n of the memory unit 13, that is, the area Y in which the group including the alternative station frequency data of the reception station having a high possibility of reception is written, and a receivable broadcasting station is searched. In step 23, it is determined whether or not there is a receivable alternative station. If there is a receivable alternative station, the process proceeds to step 29 to change the reception to a receivable alternative station. On the other hand, if there is no receivable alternative station, the process proceeds to step 24.

In step 24, it is determined whether or not all the substitute station frequency data written in the memory unit 13 has been searched. If not, go to step 25,
If the search has been performed, there is no alternative station that can be received, so that the operation is terminated without changing the reception.

In step 25, 1 is added to k, and then in step 26, it is determined whether or not k is equal to Y. If they are not equal, the process proceeds to step 28, while if they are equal, the process proceeds to step 27, 1 is added to k, and the process proceeds to step 28.

In step 28, n is set to k, and the process returns to step 22.

Steps 26 and 27 are processing for not re-searching the area Y of the memory section 13 which has been searched preferentially.

According to the RDS receiving system according to the present embodiment (2), the memory unit 13 in which the group including the substitute station frequency data of the receiving station with high possibility of receiving is written.
The search time can be shortened by preferentially searching the area Y.

FIG. 3 is a block diagram schematically showing a CPU of the RDS receiving system according to the embodiment (3).
The CPU 30 of the RDS receiving system includes a data receiving unit 1
1. Data identification unit 32, memory unit 33, and NF activation unit 3
4 is included. The RDS demodulated signal is received by the data receiving unit 11, and the output side of the data receiving unit 11 is connected to one input side of the data identification unit 32. The output side of the data identification unit 32 is connected to the input side of the memory unit 33. The output side of the memory unit 33 is connected to the input side of the NF activation unit 34, and the output side of the NF activation unit 34 is connected to the other input side of the data identification unit 32.

The operation of the data identification unit 32 of the RDS receiving system according to the embodiment (3) configured as described above will be described with reference to the flowchart shown in FIG.

Reference numeral m denotes a memory unit 3 in which a group of alternative station frequency data including reception station frequency data is written.
3 shows an area 3.

First, in step 31, the counter k is set to -1. Next, in step 32, a receiving station change signal in the NF activation unit 34 is detected. Then, in step 33, the receiving station is changed by the NF. Is determined. If it has not been changed by NF, the process proceeds to step 36, and if it has been changed by NF, step 3
4, the data in the area m of the memory unit 33 is stored in the memory unit 3
3 is written to area 0, and then at step 35, k
Is set to 0, and the routine proceeds to step 36.

In step 36, 1 is added to k. Then, in step 37, the alternative station frequency data is input from the data receiving unit 11 in groups, and in step 38, the data is stored in the area k of the memory unit 33. Is written. Next, in step 39, it is determined whether or not the writing of all the substitute station frequency data transmitted from the receiving station has been completed. If not, step 36
Returning to step, if the operation has been completed, the operation ends.

The operation of the NF activation unit 34 of the RDS receiving system according to the embodiment (3) will be described with reference to the flowchart shown in FIG.

Reference numeral n indicates an area of the memory unit 33 to be searched, and reference numeral X indicates an area of the memory unit 33 in which a group including alternative station frequency data for which search is prioritized is written.

First, in step 41, n is set to X and k for the counter is set to 0. Then, in step 42, the substitute station frequency data is read from the area 0 of the memory unit 33 to search for a receivable broadcasting station. Then, in step 43, it is determined whether or not there is a receivable alternative station. If there is a receivable alternative station, the process proceeds to step 46 to change the reception to a receivable alternative station. On the other hand, if there is no receivable alternative station, the process proceeds to step 44.

At step 44, the area n of the memory section 33
Then, the alternative station frequency data is read from, and a receivable broadcast station is searched. Next, in step 45, it is determined whether there is an alternative receivable station. If there is a receivable alternative station, the process proceeds to step 46 to change the reception to a receivable alternative station. On the other hand, if there is no receivable substitute station, the process proceeds to step 47.

In step 47, it is determined whether or not all the substitute station frequency data written in the memory unit 33 has been searched. If not, go to step 48,
If it has been searched, there is no receivable alternative station, so the operation is terminated without changing the reception.

In step 48, 1 is added to k, and then in step 49, it is determined whether or not k is equal to X. If they are not equal, the process proceeds to step 51, while if they are equal, the process proceeds to step 50, 1 is added to k, and the process proceeds to step 51.

In step 51, n is set to k, and the process returns to step 44.

Steps 49 and 50 are processing for not re-searching the area X of the memory unit 33 which has been searched preferentially.

According to the RDS receiving system according to the present embodiment (3), the area m of the memory section 33 in which the group of the alternative station frequency data including the receiving station frequency data is written is replaced with a highly receivable alternative. Since the station frequency data is included, the group is stored in the area 0 of the memory unit 33 even after the reception is changed by the NF,
The search time can be shortened by preferentially searching the area 0 of.

FIG. 6 is a block diagram schematically showing a CPU of the RDS receiving system according to the embodiment (4). The CPU 50 of the RDS receiving system includes a data receiving unit 51, a data identifying unit 52, a memory unit 53, and an EON activation unit 54. The RDS demodulated signal is received by the data receiving unit 51, and the output side of the data receiving unit 51 is connected to the input side of the data identification unit 52. The output side of the data identification unit 52 is connected to the input side of the memory unit 53, and the output side of the memory unit 53 is connected to the input side of the EON activation unit 54.

The operation of the data identification unit 52 of the RDS receiving system according to the embodiment (4) configured as described above will be described.

The data receiving section 51 writes the traffic information station frequency data and the receiving station frequency data paired with the traffic information station frequency data into the memory section 53 irrespective of the transmission method.

According to the RDS receiving system according to the embodiment (4), all the transmitted traffic information station frequency data can be written irrespective of the transmission method, so that all traffic information station frequency data can be searched. , Good traffic information can be obtained.

FIG. 7 is an arrangement diagram schematically showing a state in which receiving station frequency data and traffic information station frequency data are written in the memory section of the RDS receiving system according to the embodiment (5). The memory unit 60 includes an area A in which the receiving station frequency data is written and an area B in which the traffic information station frequency data is written. In the area a, the receiving station frequency data 1 and the traffic information station frequency data 1 transmitted by the map method are written, and in the areas b and i, the data transmitted by the map method are written. In the areas c to h, traffic information station frequency data 3 to 8 transmitted in the A method are written in the area B. However, in the A method, the receiving station frequency data is not transmitted, so the area A is empty. It has become.

According to the RDS receiving system according to the embodiment (5), since data transmitted from other than the receiving station is also written in the memory section 60, more traffic information station frequency data can be retrieved. Good traffic information can be obtained.

Next, the operation of EON start-up section 54 in the RDS receiving system according to Embodiment (6) of the present invention will be described with reference to the flowchart shown in FIG.

First, in step 61, the memory unit 6
The receiving station frequency data is read from the area A of 0, and it is determined in step 62 whether or not there is a receiving station. If there is a receiving station, the traffic information station frequency data transmitted in a pair with the receiving station is read out from the memory unit 60, and in step 64, it is determined whether or not the traffic information station is a receivable traffic information station. . If it can be received, the process proceeds to step 67 to receive the traffic information bureau. On the other hand, if the reception is not possible, the process proceeds to step 65.

In step 65, the area B of the memory unit 60
Then, at step 66, it is determined whether there is a receivable traffic information station. If there is a traffic information station that can be received, step 6
Proceed to 7 to receive a traffic information bureau. On the other hand, if there is no receivable traffic information station, the operation is terminated.

According to the RDS receiving system according to the present embodiment (6), since the traffic information station previously associated with the receiving station has a high possibility of receiving, the receiving station frequency data is searched with priority and received. By searching for possible traffic information office frequency data, the search time can be reduced.

[Brief description of the drawings]

FIG. 1A shows an RD according to an embodiment (1) of the present invention.
FIG. 3 is a block diagram schematically illustrating a CPU of an S receiving system, (b) is a flowchart illustrating an operation of a data identification unit according to the embodiment (1), and (c) is a flowchart according to the embodiment (1). 6 is a flowchart illustrating the operation of the NF activation unit.

FIG. 2 is a flowchart showing an operation of an NF activation unit in the RDS receiving system according to Embodiment (2).

FIG. 3 is a block diagram schematically showing a CPU of an RDS receiving system according to Embodiment (3).

FIG. 4 is a flowchart showing an operation of a data identification unit according to the embodiment (3).

FIG. 5 is a flowchart showing an operation of an NF activation unit according to the embodiment (3).

FIG. 6 is a block diagram schematically showing a CPU of an RDS receiving system according to Embodiment (4).

FIG. 7 is a layout diagram schematically showing a state in which receiving station frequency data and traffic information station frequency data are written in a memory unit of an RDS receiving system according to Embodiment (5).

FIG. 8 is a flowchart showing an operation of an EON starting unit in the RDS receiving system according to Embodiment (6).

FIG. 9 is a block diagram schematically illustrating a conventional RDS receiving system.

FIG. 10 is a graph schematically showing a case where, in a conventional RDS receiving system, when the electric field intensity of a receiving station becomes equal to or less than a threshold value, the receiving side checks the electric field intensity of an alternative station and changes reception to a broadcasting station which can be replaced; is there.

Claims (6)

[Claims] 1. An NF (Network Follow) that can change the reception to a receivable alternative station according to the electric field strength of the receiving station.
In an RDS (Radio Data System) receiving system having a function, a memory unit capable of writing all alternative station frequency data transmitted regardless of the transmission method is provided, and the alternative station frequency data transmitted in the same block is stored in one block. An RDS receiving system comprising: a data identification unit configured to write data in the memory unit in groups. 2. The RDS receiving system according to claim 1, further comprising an NF activation unit for preferentially searching for alternative station frequency data of the receiving station for NF. 3. A memory unit capable of storing a group of alternative station frequency data including the receiving station frequency data after the receiving station is changed by the NF, and an NF starting unit that preferentially searches for the group. The RDS receiving system according to claim 1 or 2, wherein: 4. An RD having an EON (other network traffic information) function capable of receiving traffic information of another network station.
In an S (Radio Data System) receiving system, a memory unit that can write all of the traffic information station frequency data and the receiving station frequency data paired with the traffic information station frequency data from the transmitted data regardless of the transmission method. An RDS receiving system comprising: 5. The apparatus according to claim 4, further comprising a memory unit capable of storing the traffic information station frequency data and the receiving station frequency data which have already been written even after the receiving station is changed. RDS receiving system. 6. An EON starting unit for preferentially searching for receiving station frequency data in order to preferentially use a traffic information station which has a high possibility of receiving and which is paired with the receiving station. The RDS receiving system according to claim 5, wherein