JP2002185345A - Method for receiving rds data and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold RDS data which can be surely received in the future without increasing the memory capacity. SOLUTION: This method comprises a step S2 for judging whether or not any empty area for storing a new PI code is present in a storage part 6; a step S3 for writing new RDS data in this empty area when the empty area is present; and a step S4 for retrieving any mismatched RDS data having a country identification code mismatched with the country identification code of the PI code, which is being received by successively retrieving RDS data Di stored in the storage part 6 which incrementing a count value Cnt, for erasing mismatched RDS data [Cnt] of the storage part 6 at the time of detecting any mismatched RDS data, and for overwriting the new RDS data in the prepared empty area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RDS data receiving method and an RDS data receiving apparatus, and more particularly to an RDS data receiving method and an RDS data receiving apparatus for a vehicle-mounted radio receiver having an RDS data receiving function.

[0002]

2. Description of the Related Art Conventionally, in the European region, an RDS (Radio Data System: Ra) containing broadcast station identification information and the like transmitted in a multiplex system at the same time as a main signal modulated in an FM system is used.
2. Description of the Related Art Radio receivers capable of receiving data (bioData System) have become widespread. The RDS data includes the station frequency (Alt) of the network station broadcasting the same program.
ernative Frequency (AF) data, and the receiver performs A based on the AF data.
An F search function can be performed.

[0003] This AF function is used in a vehicle-mounted radio receiver when a vehicle moves out of the service area of a broadcasting station A that is currently listening to, and a destination of a moving destination that is executing the same broadcasting program as the broadcasting station A is operated. When the user enters another broadcasting station B having a different frequency, that is, the service area of the network station B, the receiving station automatically switches to the receiving frequency of the network station B, and controls so that the same broadcasting program can be continuously heard. . Each RDS broadcasting station (hereinafter, RDS station) transmits RDS data including frequency data of a network station adjacent to the outer periphery of the service area of the own station as an AF list.

[0004] Further, the RDS station recognizes a program together with the AF data (Program Identificatio).
n: PI) code and program service name information (Progr
amService Name (PS) code is also transmitted. The PI code is composed of a country code and a broadcast station code, and is data represented by four hexadecimal digits.
For example, in the case of a network station, data of the same configuration is transmitted to each station. This PI code is used to determine whether to receive the same frequency station different from the network station being listened to, or to determine the PI code when it is not possible to move to the next broadcast station in the AF search.
Used for search. The PS data is data representing the name of the broadcasting station being received. The receiver has AF data,
RDS data including a PI code and PS data can be received and written to a memory, and various RDS functions can be performed using the RDS data.

A conventional RDS data receiving method of a conventional RDS receiver described in Japanese Patent Application Laid-Open No. 9-172383 will be described with reference to FIG. 8 which is a flowchart showing the conventional RDS data receiving method. The process of writing RDS data to the above memory when receiving new RDS data more than the number of PI codes that can be stored
After obtaining the DS data (step P1), the RDS data search counter value is set to a random value (step P2).
The DS data was written (step P3).

Therefore, the RD of the memory erased at that time is
The RDS data in the S data area may be RDS data of an RDS station that can be received in the future as the vehicle travels, that is, RDS data that can be received in the future.
When trying to receive an I-code RDS station, it takes time to be able to receive.

As a solution to this, there is a method of increasing the RDS data area, but the required memory capacity increases.

[0008]

The above-mentioned conventional RDS
The data receiving method and the RDS receiving apparatus are provided with an RDS of a memory.
New RDS with more than the number of PI codes that can be stored in the data area
In the process of writing RDS data to the memory at the time of data reception, after acquiring new RDS data, the RDS data search counter value is set to a random value, and the RDS data writing process is performed.
When trying to receive an RDS station with a PI code in the S data area, there is a drawback that it takes time to be able to receive.

Further, the method of increasing the RDS data area has a disadvantage that the required memory capacity increases.

An object of the present invention is to provide an RDS that can hold RDS data that can be received in the future without increasing the memory capacity.
A DS data receiving method and an RDS receiving apparatus are provided.

[0011]

According to the first aspect of the present invention, R
The DS data receiving method is a method of multiplexing an RDS signal corresponding to RDS data including a program identification code including broadcast station country and station identification information and broadcast frequency information together with a main signal.
In the RDS receiving method for receiving an S broadcast wave, the first country identification code included in the first program identification code of the first RDS data currently being received and the second RDS data previously stored in the RDS data storage means Is compared with a second country identification code included in the second program identification code, and if the first and second country identification codes do not match, the second RDS data is erased from the RDS data storage means. It is characterized by doing.

According to a second aspect of the present invention, there is provided an RDS data receiving method comprising multiplexing an RDS signal corresponding to RDS data including a program identification code comprising broadcast station country and station identification information and broadcast frequency information together with a main signal. In an RDS receiving method for receiving a wave, a first RDS for generating first RDS data currently being received by decoding an RDS signal generated by demodulating multiplexed RDS information from a received and demodulated signal. A data generation step, and a free area determination step of determining whether there is a free area in the storage means for storing the RDS data, the first program identification code being the program identification code of the first RDS data; An empty area storing step of storing the first RDS data in the empty area if there is an empty area in the empty area determining step; If there is no free space in the free space determination step, the second RDS data stored in the storage means is sequentially searched, and the first country identification of the first program identification code of the first RDS data is performed. A search is made for the country identification code mismatched RDS data, which is the second RDS data having a country identification code mismatched with the code, and when the country identification code mismatched RDS data is detected, the country identification code mismatched RDS data is read from the storage means. Erasing and creating a free area, and a country identification code mismatch RDS data search step of storing the first RDS data in the free area.

According to a third aspect of the present invention, in the RDS data receiving method according to the second aspect, the country identification code mismatch RDS data searching step includes the step of searching for the second RDS data stored in the storage means. A search counter initialization step of initializing a count value of a search counter for searching for a country identification code; a country identification code of the second RDS data corresponding to the count value; and a country identification code of the first RDS data. A country identification code match determination step for determining whether or not they match, an increment step for incrementing the count value by one when the country identification code match determination step matches, and the country identification code match determination until the count value reaches a maximum value An end determination step of repeating a step and the increment step;
If the country identification code mismatch RDS data is detected in the country identification code match determination step, the country identification code mismatch RDS data is erased from the storage means to create an empty area, and the first RDS is stored in the empty area. And a step of deleting a country identification code mismatch RDS data for storing data.

According to a fourth aspect of the present invention, there is provided an RDS data receiving method comprising multiplexing an RDS signal corresponding to RDS data including a program identification code comprising broadcast station country and station identification information and broadcast frequency information together with a main signal. In an RDS receiving method for receiving a wave, a first RDS for generating first RDS data currently being received by decoding an RDS signal generated by demodulating multiplexed RDS information from a received and demodulated signal. A data generation step, and a free area determination step of determining whether there is a free area in the storage means for storing the RDS data, the first program identification code being the program identification code of the first RDS data; An empty area storing step of storing the first RDS data in the empty area if there is an empty area in the empty area determining step; A country identification code search for searching for a country identification code of the program identification code of the RDS data is performed, and a most-received country identification, which is a country identification code received most in the second RDS data stored in the storage means, The second RD of the country identification code that does not match the code
A most-receiving-country country identification code search step for erasing S data and creating a free area; and first RDS data for writing the first RDS data into the free area created in the most-reception-number country identification code searching step And a storage step.

According to a fifth aspect of the present invention, in the RDS data receiving method according to the fourth aspect, the step of searching for the most-receivable-country country identification code performs an automatic tuning operation from the lowest receivable frequency. And a second step of acquiring the program identification code at the frequency received by the automatic tuning, determining the country identification code, and storing the country identification code as a first reception country identification code in a first reception country identification code storage area. Resumes the automatic channel selection operation to select the next broadcasting station, similarly obtains the program identification code and determines its country identification code, and this country identification code is the first receiving country identification code. When the number matches, the received number of the first country identification code is incremented by 1, and when the number does not match, the number is stored in the second reception country identification code storage area as the second reception country identification code and the second
A third step of incrementing the number of received country identification codes by +1 and performing automatic tuning to the maximum receivable frequency while repeating the operations of the first to third steps. A fourth step of mutually comparing the first and second counts of the number of received country identification codes obtained in step (a), and in the fourth step, the number of received first country identification codes and the second country identification If the difference between the number of received codes and the number of received codes is equal to or greater than a predetermined threshold, the second RDS data stored in the storage means has a country identification code other than the first country identification code. In the fifth step of erasing RDS data and the fourth step, if the difference in the number of received data is not greater than or equal to the threshold value, the first and second RDS data among the second RDS data stored in the storage means are read out. 2 country identification code or less Those characterized by having a fifth step of erasing the RDS data with the country identification code.

According to a sixth aspect of the present invention, there is provided an RDS data receiving method comprising multiplexing an RDS signal corresponding to RDS data including a program identification code comprising broadcaster country and station identification information and broadcast frequency information together with a main signal. In an RDS receiving method for receiving a wave, a first RDS for generating first RDS data currently being received by decoding an RDS signal generated by demodulating multiplexed RDS information from a received and demodulated signal. A data generation step, and a free area determination step of determining whether there is a free area in the storage means for storing the RDS data, the first program identification code being the program identification code of the first RDS data; An empty area storing step of storing the first RDS data in the empty area if there is an empty area in the empty area determining step; The highest electric field which is the country identification code of the RDS data of the broadcasting station having the highest electric field strength in the order of the electric field strength of the broadcasting station which has been able to perform the country identification code search for the country identification code of the program identification code of the RDS data. A step of searching for a maximum field strength country identification code for erasing the second RDS data of a country identification code that does not match the strength country identification code to create an empty area; A first RDS to be written into the empty area created in the search step
And a data storage step.

According to a seventh aspect of the present invention, in the RDS data receiving method according to the sixth aspect, the step of searching for the highest electric field strength country identification code performs an automatic tuning operation from the lowest receivable frequency. Acquiring the program identification code at the frequency received by the automatic channel selection, determining the country identification code, storing the country identification code as a first reception country identification code in a first reception country identification code storage area, and A second step of also acquiring the electric field strength of the first broadcast station and storing it in the first electric field strength storage area as the first electric field strength, and restarting the automatic channel selection operation to select the next broadcast station, and similarly to the program A third step of acquiring an identification code and its electric field strength to determine a match between the country identification code and the first receiving country identification code acquired in the second step;
A fourth step of comparing the electric field strength with the first electric field strength and updating the first electric field strength to a larger one, and a case of a mismatch in the third step , The country identification code of the next broadcasting station to the second
The fifth step of storing the received field identification code in the second received country identification code storage area as the receiving country identification code and storing the field strength in the second field strength storage area; and the operations of the first to fifth steps. A sixth step of performing automatic tuning up to the maximum receivable frequency while repeating and comparing the first and second electric field intensities at the time when the automatic tuning operation ends; and a sixth step. When the electric field intensity difference, which is the difference between the first electric field intensity and the second electric field intensity, is equal to or greater than a predetermined threshold value, the first RDS data among the second RDS data stored in the storage means is used. In the seventh step of erasing RDS data having a country identification code other than the country identification code, and in the sixth step, when the electric field strength difference is not equal to or greater than the threshold value, 2
An RDS data having a country identification code other than the first and second country identification codes in the RDS data.

The RDS data receiving apparatus according to the present invention is an RDS broadcasting apparatus which multiplexes an RDS signal corresponding to RDS data including a program identification code composed of country and station identification information of a broadcasting station and broadcast frequency information together with a main signal. In an RDS receiving apparatus including an RDS broadcast receiving unit that receives a wave and stores and displays the RDS data, the RDS broadcast receiving unit receives a received signal of the RDS broadcast wave of an FM radio wave and outputs an FM demodulated signal. And a RDS demodulator for receiving the FM demodulated signal and demodulating the multiplexed RDS signal, and operating under program control to operate the RDS.
A control unit that controls the operation of the entire system including decoding of the DS signal and a storage unit described below, a display unit that displays information including the reception frequency information, and a storage unit that includes an RDS data memory that stores the RDS data. , An amplifier for amplifying an audio signal, and a speaker for converting the audio signal into audio, wherein the control unit is configured to control the first country identification included in the first program identification code of the first RDS data currently being received. A second country identification code included in a second program identification code of the second RDS data stored in advance in the RDS data memory of the storage unit, and comparing the first and second country identification codes with each other. Are not matched, control is performed to erase the second RDS data from the RDS data memory.

According to a ninth aspect of the present invention, in the RDS data receiving apparatus according to the eighth aspect, the control unit decodes the RDS signal to generate the first RDS data, and The first country identification code of the first program identification code constituting the RDS data is extracted, and the RDS of the storage unit is extracted based on the first country identification code.
An RDS memory control unit that controls the data memory is provided.

The invention described in claim 10 is the same as the ninth invention.
In the RDS data receiving device, the RDS memory control unit determines whether a first program identification code of the first RDS data exists in the RDS data memory, and determines whether the first program identification code is the same as the first program identification code. If there is RDS data having the program identification code of (1), the first program identification code is additionally stored in the memory area, and there is no RDS data having the same program identification code as the first program identification code. In this case, a new memory area for the first program identification code is newly created, the first program identification code is stored in this new memory area, and the RDS
When the new memory area for the first program identification code is insufficient in the data memory, the second RDS data stored in the RDS data memory has a country identification code that does not match the first country identification code. An empty area is created by searching and erasing RDS data, and control is performed to store the first RDS data in the empty storage area.

[0021]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The RDS data receiving method and the RDS data receiving apparatus according to the present embodiment multiplex RDS data-compatible RDS signals including broadcast frequency information and a program identification code consisting of country and station identification information of a broadcasting station together with a main signal. R
In the RDS receiving method for receiving a DS broadcast wave, the first country identification code included in the first program identification code of the first RDS data currently being received and the second RDS data previously stored in the RDS data storage means Is compared with the second country identification code included in the second program identification code. If the first and second country identification codes do not match, the second RDS data is deleted from the RDS data storage means. It is characterized by doing.

Next, referring to FIG. 1 showing a block diagram of an RDS receiving apparatus according to a first embodiment for performing the RDS data receiving method of the present invention, the RDS receiving apparatus according to the present embodiment shown in FIG.
The data receiving device includes an RDS broadcast receiving unit 10 that receives an RDS broadcast and stores and displays the RDS data.

The RDS broadcast receiving unit 10 is adapted to transmit the RD of the FM radio wave.
A tuner 1 for receiving an S broadcast wave reception signal and outputting an FM demodulated signal, an RDS demodulation unit 2 for receiving an FM demodulated signal and demodulating a multiplexed RDS signal; A control unit 3 for controlling the operation of the entire system including the decoding and storage unit 6, a key 4 for performing an operation, a display unit 5 for displaying reception frequency information and the like,
A storage unit 6 for storing RDS information, an amplifier 7 for amplifying an audio signal, and a speaker 8 for converting the audio signal into audio are provided.

The control unit 3 is constituted by a DSP (Digital Signal Processor) or the like, decodes the RDS signal, determines the country identification code among the PI codes constituting the decoded RDS data, and stores it based on the determination result. Part 6
Memory control unit 3 for controlling the RDS data memory of
1 is provided.

FIG. 2 shows an example of the configuration of the RDS data memory of the storage unit 6 in a table format.
RD including n kinds of PI codes 1 to Dn (n is an integer)
S data can be stored.

As described above, each RDS data includes station frequency (AF) data, which is a list of station frequency data of network stations broadcasting the same program, and program recognition (P) data.
I) Code and program service name information (PS) data.

The PI code is 2-byte data and includes a country identification code and a broadcast station code.

The PS data is 4-byte data,
This is data representing the name of the broadcasting station being received.

The AF data is 1-byte data, and in this example, data for n stations AF1 and AF2 is stored.

Next, a schematic operation of the receiving apparatus according to the present embodiment will be described with reference to FIGS. 1 and 2. First, an FM demodulated signal received and demodulated by the tuner 1 is input to the RDS demodulating section 2, The RDS demodulation unit 2 outputs the multiplexed RD
The R information is generated by demodulating the S information and supplied to the control unit 3.

The control unit 3 has a function of controlling the operation of the entire system.
The signal is decoded, data is collected for each PI code as follows, and stored in the RDS data memory of the storage unit 6.

That is, the RDS memory control unit 31 of the control unit 3 decodes the supplied RDS signal and
Data is generated, and it is determined whether or not the PI code of the RDS data (hereinafter, a new PI code) exists in the RDS data memory of the storage unit 6. The same PI as the new PI code
When the RDS data having the code exists in the RDS data memory (hereinafter, abbreviated as the storage unit 6) area of the storage unit 6,
The new PI code is additionally stored in the area, and if the same PI code as the new PI code does not exist in the memory, a new area for the new PI code is created and the new PI code is stored.

As described above, the RDS data memory of the storage unit 6 has only a storage capacity for n types of PI codes. Therefore, when n + 1 or more types of PI codes are received, a reception PI code to be newly stored is stored. May be insufficient. At that time, the RDS memory control unit 31 extracts the country identification code from the PI code of the currently receiving broadcast station, that is, the new PI code, and stores the country identification code other than the currently received country identification code from the stored RDS data memory. The RDS data having the country identification code is searched, the RDS data is erased to create a free storage area, and the newly acquired RDS data is stored in the storage unit 6 in the free storage area.

The operation of searching for the RDS data to be deleted using the country identification code and storing the new information will be described with reference to FIG.
The data receiving method will be described using a specific example. In this embodiment, for convenience of explanation, the RDS memory control unit 3
1 is the RD stored in the storage unit 6 although not particularly shown.
It is assumed that a search counter having a count value Cnt = 1 to n for searching for S data Di (i is 1 to n) is provided.
Therefore, when the count value Cnt = 1, the RDS data D
1 shall be specified. First, the signal received and demodulated by the tuner 1 is input to the RDS demodulation unit 2, and the multiplexed RDS information is demodulated to generate an RDS signal.
An S signal is output to the control unit 3. RDS of control unit 3
The memory controller 31 decodes the supplied RDS signal to generate RDS data (Step S1).

Next, the RDS memory control unit 31 determines whether or not the storage unit 6 has a free reception PI code, that is, an empty area for storing the new PI code (step S).
2). If there is a vacant area, newly acquired RDS data (hereinafter referred to as new RDS data) is written into this vacant area (step S3).

If there is no free area in step S2, the process proceeds to step S4.

The mismatched RDS data search step S4 includes:
Step S40 of initializing the count value Cnt of the search counter and step S4 of determining whether the country identification code of the RDS data (hereinafter referred to as RDS data Cnt) with the count value Cnt = i matches the country identification code of the new RDS data.
1 and an increment step S42 for incrementing the count value Cnt by 1 when a match is found in the match determination step S41, and the count value Cnt is a maximum value, in this example, n
Is determined, and steps S41 to S41 are performed until the
An end determination step S43 in which the processing of S43 is repeated, and an RDS in which the country identification codes do not match in the match determination step S41.
If the data can be detected, the step of erasing the RDS data having a mismatch of the country identification code stored in the memory of the storage unit 6 and overwriting and storing the newly received new RDS data in an empty area of the created memory. Have.

In step S4, the RDS memory control unit 3
1 initializes the count value Cnt of the search counter (step S40).

Next, while incrementing the count value Cnt, the RDS data Di stored in the storage unit 6 is incremented.
Are searched in order to search for unmatched RDS data having a country identification code that does not match the country ID code of the PI code being received (steps S41 to S43).

If the RDS data in which the country identification codes do not match is detected in step S41, the process proceeds to step S44. If the RDS data is not detected, the process ends.

Lastly, the RDS which is detected in step S41 and which does not match the country identification code stored in the memory of the storage unit 6
Data (here, for convenience of explanation, RDS data [Cn
t]), and overwrites and stores the newly received new RDS data in the empty area of the memory created thereby (step S44).

As described above, the RDS data receiving method and the RDS data receiving apparatus according to the present embodiment preferentially erase RDS data whose country identification code does not match.
Necessary information can be left and new information can be stored.

Since only necessary data can be stored with priority, effective data can be stored even with a small memory capacity, and the memory capacity for storing RDS data can be reduced.

Next, a second embodiment of the RDS data receiving method of the present invention will be described with reference to FIG. The difference between the present embodiment shown in this figure and the above-described first embodiment is that the country identification code search among the RDS data stored in the storage unit 6 is performed instead of the mismatched RDS data search step S4. The most-received country identification code search step S6 for deleting the RDS data of the country identification code that does not match the most-received country identification code to create a free area, and the most-received country identification code search step for new RDS data A new RDS data storage step S7 for writing in the free area created in S6.

That is, in the most-received-country identification code search step S6 of the present embodiment, the empty area step S
If the result of determination 2 is that there is no free area in the storage unit 6 for storing the newly received RDS data, all the receivable frequencies are searched in a country identification code search step S6, Are sequentially stored, and the country ID code that has received the most is set as the receiving country ID code 1, and the country ID code that has been received the next most is the receiving country ID code 2
And Thereafter, of the stored RDS data, the RDS data having a country identification code that does not match the country identification codes 1 and 2 is deleted to create an empty area, and the new RDS data is stored in this empty area in step S7. It is.

The operation of the most-received-country identification code search step S6 will be described with reference to FIG. 4 and the flowchart of FIG. 5 showing details of the most-received-country country identification code search step S6. First, new RDS data is received. Then, when a free area for storing the new RDS data cannot be secured (steps S1 and S2), an automatic tuning operation is performed from the lowest receivable frequency (step S60). A PI code is acquired at the frequency received by the automatic tuning (steps S61 and S62), and its country identification code (hereinafter abbreviated as "country code" in the figure) is determined.
Is stored in the receiving country ID code 1 storage area (step S63).

When the processing in step S63 is completed, the automatic channel selection operation is restarted, the next broadcast station is selected, and the PI code is obtained in the same manner. At this time, if the acquired country identification code of the PI code matches the country identification code acquired in step S63, the count value of the country identification code 1 reception counter (hereinafter, the number of country identification code 1 reception) is incremented by 1 (step S63). S6
4) If they do not match, the country identification code 2 is stored in the reception country identification code 2 storage area as the reception country identification code 2 and the count value of the country identification code 2 reception number counter (hereinafter, country identification code 2 reception number). Is incremented by 1 (step S
65, S66).

While repeating the operations of steps S61 to S66, automatic tuning is performed to the maximum receivable frequency (step S67), and the number of received country identification codes 1 and country identification obtained at the end of the automatic tuning operation are obtained. The number is compared with the number of received codes 2 (step S68). At this time, if there is a difference between the number of received country identification codes 1 and the number of received country identification codes 2 equal to or greater than the threshold value q, it is determined that the own vehicle position is in the country indicated by the received country identification code 1, and other than that. The RDS data of the country identification code is deleted (step S69). If there is no difference between the number of received country identification codes 1 and the number of received country identification codes 2 equal to or greater than the threshold value q, the own vehicle position is determined to be near the border of the country indicated by those country identification codes. The RDS data having a country identification code other than the code 1 and the reception country identification code 2 is deleted (step S70).

Next, a third embodiment of the RDS data receiving method of the present invention will be described with reference to FIG. The difference between the present embodiment shown in this figure and the above-described second embodiment is that, instead of the country identification code search step S6 for the most-received countries, the electric field of the broadcast station which can be received at the time of country identification code search is obtained. The highest electric field that erases the second RDS data of the country identification code that does not match the highest field intensity country identification code that is the country identification code of the RDS data of the broadcasting station that has the highest electric field intensity in order of intensity to create a vacant area A strong country identification code search step S8 is provided.

FIG. 6 and FIG. 7 showing details of the highest field strength country identification code search step S8 with common reference characters / numerals for components common to FIG. The operation of the field strength country identification code search step S8 will be described below. For convenience of explanation, the country identification code of the RDS data of the broadcast station having the highest field strength in the order of the field strength of the broadcast station that can be received during the country identification code search Is the receiving country identification code A, and the country identification code of the RDS data of the broadcasting station that can be received with the next highest electric field strength is the receiving country identification code B. First, when new RDS data is received and an empty area for storing the new RDS data cannot be secured (steps S1 and S2), an automatic channel selection operation is performed from the lowest receivable frequency (step S1).
60). The PI code is acquired at the frequency received by the automatic tuning (steps S61 and S62), the country identification code (hereinafter, abbreviated as the country code in the figure) is determined (step S80), and received as the reception country identification code A. The country identification code is stored in the country identification code A storage area. At the same time, the electric field intensity of the receiving station is also acquired and stored in the electric field intensity A storage area as the electric field intensity A (step S81).

Upon completion of the process in the step S81, the automatic tuning operation is restarted to select the next broadcasting station, and similarly, the PI code and the electric field strength are obtained. At this time, it is determined whether the acquired country identification code of the PI code matches the country identification code acquired in step S81 (step S82). If the country identification code matches, the electric field strength of the receiving station is measured and the electric field stored in step S81 is measured. The electric field intensity A is updated to be larger than the intensity A (step S83).

In step S82, if they do not match, the receiving country identification code B is used as the receiving country identification code B.
The country identification code is stored in the storage area, and the electric field strength is stored as electric field strength B in the electric field strength B storage area (steps S84 and S85).

Steps S61 to S62, S80 to S85
While repeating the above operation, automatic tuning is performed up to the maximum receivable frequency (step S67), and the field strengths of the country identification code A and the country identification code B are compared when the automatic tuning operation is completed (step S86). .

At this time, the electric field intensity A of the receiving country identification code A
If there is a difference in the electric field strength B of the receiving country identification code B and the threshold value s or more, it is determined that the own vehicle position is a country in which the country identification code A with a high electric field strength has been acquired, and the other countries The RDS data of the identification code is deleted (step S87).
If there is no difference between the electric field strengths A and B equal to or greater than the threshold s,
It is determined that the own vehicle position is near the border of the country indicated by the country identification code, and RDS data having a country identification code other than the reception country identification codes A and B is deleted (step S88).

By having a plurality of non-erasable country identification code candidates as in the second and the present embodiments, even if there are a plurality of receiving country identification codes near the border, the RDS data having an unnecessary country identification code can be used. Can be erased preferentially.

In the second and third embodiments, an example has been described in which the number of receiving country identification codes is two, but it goes without saying that the same operation is performed when the number is three or more. .

[0058]

As described above, the RDS data receiving method and the RDS data receiving apparatus of the present invention provide the first country identification code of the first RDS data currently being received and the RDS data stored in the RDS data storage means. The second RDS data is compared with the second country identification code. If the first and second country identification codes do not match, the second RDS data is stored in the second RDS data storage means.
Since data is erased, there is an effect that necessary information can be left and new information can be stored.

Since only necessary data can be stored with priority, effective data can be stored even with a small memory capacity, so that the memory capacity for storing RDS data can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an RDS data receiving apparatus that performs an RDS data receiving method according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a configuration of RDS data stored in a storage unit of FIG.

FIG. 3 is a flowchart illustrating an example of an operation in the RDS data receiving method according to the present embodiment.

FIG. 4 is a flowchart illustrating an RDS data receiving method according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing details of a most-received-country country identification code search step of the present embodiment.

FIG. 6 is a flowchart illustrating an RDS data receiving method according to a third embodiment of the present invention.

FIG. 7 is a flowchart showing details of a maximum electric field strength country identification code search step of the present embodiment.

FIG. 8 is a flowchart illustrating an example of a conventional RDS data receiving method.

[Explanation of symbols]

 Reference Signs List 1 Tuner 2 RDS demodulation unit 3 Control unit 4 Key 5 Display unit 6 Storage unit 7 Amplifier 8 Speaker 31 RDS memory control unit

Claims (10)

[Claims] An R including a program identification code comprising broadcast station country and station identification information and broadcast frequency information together with a main signal.
An RDS receiving method for receiving an RDS broadcast wave obtained by multiplexing RDS signals corresponding to DS data, comprising: a first country identification code included in a first program identification code of a first RDS data currently being received; Comparing the second country identification code included in the second program identification code of the second RDS data stored in the storage means, and if the first and second country identification codes do not match, storing the RDS data; RDS data receiving method, wherein the second RDS data is erased from the means. 2. An R including a program identification code comprising broadcaster country and station identification information and broadcast frequency information together with a main signal.
In an RDS receiving method for receiving an RDS broadcast wave obtained by multiplexing an RDS signal corresponding to DS data, an RDS signal generated by demodulating multiplexed RDS information from a received demodulated signal is decoded, and a currently received RDS signal is decoded. A first RDS data generating step of generating first RDS data; and an empty area for storing the first program identification code, which is the program identification code of the first RDS data, in storage means for storing the RDS data. An empty area determining step of determining whether there is an empty area; an empty area storing step of storing the first RDS data in the empty area if there is an empty area in the empty area determining step; When there is no area, the second RDS data stored in the storage unit is sequentially searched, and the first RDS data of the first RDS data is searched. The country identification code mismatch R, which is the second RDS data having a country identification code that does not match the first country identification code of the program identification code
When the DS data is searched and the country identification code mismatched RDS data is detected, the country identification code mismatched RDS data is erased from the storage means to create a free area, and the first RDS data is stored in the free area. RDS data searching step for detecting a country identification code mismatch RDS data. 3. A search counter for initializing a count value of a search counter for searching for a country identification code of the second RDS data stored in the storage means, wherein the country identification code mismatch RDS data search step is performed. An initialization step; a country identification code match determination step of determining whether the country identification code of the second RDS data corresponding to the count value matches the country identification code of the first RDS data; and the country identification code match determination step An increment step of incrementing the count value by 1 when the count value matches; an end determination step of repeating the country identification code match determination step and the increment step until the count value reaches a maximum value; and the country identification code match. When the country identification code mismatch RDS data is detected in the determination step Erasing the country identification code mismatched RDS data from the storage means to create an empty area, and storing the first RDS data in the empty area. R according to claim 2,
DS reception method. 4. An R including a program identification code comprising broadcaster country and station identification information and broadcast frequency information together with a main signal.
In an RDS receiving method for receiving an RDS broadcast wave obtained by multiplexing an RDS signal corresponding to DS data, an RDS signal generated by demodulating multiplexed RDS information from a received demodulated signal is decoded, and a currently received RDS signal is decoded. A first RDS data generating step of generating first RDS data; and an empty area for storing the first program identification code, which is the program identification code of the first RDS data, in storage means for storing the RDS data. An empty area determining step of determining whether there is an empty area; an empty area storing step of storing the first RDS data in the empty area if there is an empty area in the empty area determining step; and the program identification of the RDS data. A country identification code search for a code country identification code is performed, and the second RDS data stored in the storage means is searched for the most. A most-received-country country identification code search step of deleting the second RDS data of a country identification code that does not match the most-received-country country identification code that is a country identification code that has been successfully received to create a free area; Writing the RDS data in the empty area created in the step of searching for the most-received country identification code.
RDS data storage step. 5. The step of searching for the most-received-country country identification code, the first step of performing an automatic channel selection operation from the lowest receivable frequency; and obtaining the program identification code at the frequency received by the automatic channel selection. A second step of determining the country identification code and storing it as a first reception country identification code in a first reception country identification code storage area; resuming the automatic channel selection operation to select the next broadcast station; Similarly, the program identification code is obtained and its country identification code is determined. If this country identification code matches the first receiving country identification code, the number of received first country identification codes is incremented by one, and In this case, a third step of storing the second country identification code in the second country identification code storage area as a second country identification code and incrementing the number of received second country identification codes by +1; and operations of the first to third steps. Repeat A fourth step of performing an automatic tuning up to the maximum receivable frequency while inter-comparing the first and second country identification code reception counts obtained at the time when the automatic tuning operation is completed. In the fourth step, when the difference between the number of received first country identification codes and the number of received second country identification codes is equal to or greater than a predetermined threshold, the received number is stored in the storage unit. A fifth step of deleting RDS data having a country identification code other than the first country identification code from the second RDS data.
And if the received number difference is not greater than or equal to the threshold in the fourth step, the second RD stored in the storage means
A step of erasing RDS data having a country identification code other than the first and second country identification codes in the S data.
Receiving method. 6. An R including a program identification code comprising broadcast station country and station identification information and broadcast frequency information together with the main signal.
In an RDS receiving method for receiving an RDS broadcast wave obtained by multiplexing an RDS signal corresponding to DS data, an RDS signal generated by demodulating multiplexed RDS information from a received demodulated signal is decoded, and a currently received RDS signal is decoded. A first RDS data generating step of generating first RDS data; and an empty area for storing the first program identification code, which is the program identification code of the first RDS data, in storage means for storing the RDS data. An empty area determining step of determining whether there is an empty area; an empty area storing step of storing the first RDS data in the empty area if there is an empty area in the empty area determining step; and the program identification of the RDS data. Search for the country identification code of the code. Broadcasting station R
A highest field strength country identification code searching step of deleting the second RDS data of a country identification code that does not match the highest field strength country identification code that is a country identification code of DS data to create a free area; A first RDS data storing step of writing RDS data into the empty area created in the step of searching for the highest electric field strength country identification code. 7. The first step of performing the automatic tuning operation from the lowest receivable frequency in the step of searching for the highest electric field strength country identification code, and acquiring the program identification code at the frequency received by the automatic tuning operation. Then, the country identification code is determined and stored in the first receiving country identification code storage area as a first receiving country identification code, and the electric field strength of the receiving station is also obtained. A second step of storing the program in an area, and restarting the automatic channel selection operation to select the next broadcast station, similarly obtaining the program identification code and the electric field strength thereof, and setting the country identification code and the second A third step of judging a match with the first receiving country identification code acquired in the step, and comparing the electric field strength with the first electric field strength when the match is obtained in the third step, No electricity A fourth step of updating the field strength to a larger one, and if the third step does not match, storing the country ID code of the next broadcasting station as a second country ID code and storing a second country ID code And store the electric field strength in the second
A fifth step of storing in the electric field strength storage area, and performing automatic tuning to the maximum receivable frequency while repeating the operations of the first to fifth steps, at the time when the automatic tuning operation ends. A sixth step of comparing the first and second electric field strengths with each other; and, in the sixth step, the first electric field strength and the second electric field strength are compared with each other.
If the difference between the electric field intensity and the electric field intensity is equal to or greater than a predetermined threshold value, the second RD stored in the storage means is stored.
A seventh step of erasing RDS data having a country identification code other than the first country identification code in the S data; and in the sixth step, if the electric field strength difference is not greater than or equal to the threshold value, the storage Said second R stored in the means
An RD step of erasing RDS data having a country identification code other than the first and second country identification codes in the DS data.
S receiving method. 8. An R including a program identification code comprising broadcast station country and station identification information and broadcast frequency information together with the main signal.
An RDS receiving apparatus comprising: an RDS broadcast receiving unit that receives an RDS broadcast wave multiplexed with an RDS signal corresponding to DS data, and stores and displays the RDS data. And a tuner for receiving the received signal and outputting an FM demodulated signal; and the multiplexed RDS supplied with the FM demodulated signal.
An RDS demodulation unit for demodulating a signal, a control unit operating under program control to control decoding of the RDS signal and an operation of the entire system including a storage unit described below, and a display unit for displaying information including the reception frequency information. A storage unit having an RDS data memory for storing the RDS data, an amplifier for amplifying an audio signal, and a speaker for converting an audio signal into audio, wherein the control unit is configured to receive the first RDS data currently being received. First
Of the first country identification code included in the second program identification code of the second RDS data stored in the RDS data memory of the storage unit in advance. When the first and second country identification codes do not match, control is performed to delete the second RDS data from the RDS data memory. 9. The control unit according to claim 1, wherein the control unit decodes the RDS signal to generate the first RDS data.
An RDS memory control unit for extracting the first country identification code of the first program identification code constituting DS data and controlling the RDS data memory of the storage unit based on the first country identification code; The RDS data receiving device according to claim 8, wherein: 10. The RDS memory control unit according to claim 1, wherein:
It is determined whether or not the first program identification code of the RDS data exists in the RDS data memory. If there is RDS data having the same program identification code as the first program identification code, the The first program identification code is additionally stored. If there is no RDS data having the same program identification code as the first program identification code, a new memory area for the first program identification code is newly created. When the first program identification code is stored in the new memory area, and when the new memory area for the first program identification code is insufficient in the RDS data memory, the first program identification code stored in the RDS data memory is used. The RDS data having a country identification code that does not match the first country identification code is searched and deleted from the RDS data of No. 2 to create a free area, RDS data receiving apparatus according to claim 9, wherein the controller controls so as to store the first RDS data 憶領 area.