JP2013207370A - Radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio receiver, in a simple composition though, which, when the vehicle enters another country from some country, can promptly remove a broadcast station in the earlier country whose reception condition is poor from a broadcast station list.SOLUTION: The radio receiver comprises: an entry determination unit 44 which determines whether the vehicle has entered a second country from a first country on the basis of the results of reception condition detection and determination of broadcast signals on each frequency included in a reception frequency band; a reception condition detection unit 16 and a reception condition determination unit 45 which, when determination was made to the effect that the vehicle has entered the second country, detect and determine the reception condition of broadcast signals of broadcast stations in the first country; and a broadcast station list update unit 49 which updates the content of a broadcast station list on the basis of the results of reception condition detection and determination made by the reception condition detection unit 16 and the reception condition determination unit 45.

Description

  The present invention relates to a radio receiver such as RDS (Radio Data System).

  2. Description of the Related Art Conventionally, an RDS receiver that detects a receivable broadcasting station periodically (for example, every 5 minutes) and creates a list (station list) is known (for example, see Patent Document 1). Also, an RDS receiver that includes a sub tuner separately from the main tuner and creates a station list using the sub tuner is known (for example, see Patent Document 2).

JP 2010-268333 A JP 2005-159868 A

  The process of updating the station list is performed by checking the presence / absence of a broadcast signal for each frequency of the reception band and detecting the reception state when a broadcast signal exists, and is included in the station list based on the detection result. Broadcast stations are added or deleted.

  By the way, when considering an RDS receiver mounted on a vehicle, the radio wave condition may be temporarily deteriorated when traveling near a high building. Updating the station list at this timing is essentially good. Therefore, it is desirable to delete the broadcast station after confirming that the reception state is poor a plurality of times. However, if an attempt is made to delete a broadcast station from the station list in this way, the RDS receiver disclosed in Patent Document 1 requires a time multiple of the period for detecting receivable broadcast stations. It takes time to delete a station with poor reception from the station list, and until it is deleted, a station with poor reception remains in the station list, and it is difficult to listen to other broadcasts when the user selects this station. There was a problem that switching to a station became necessary and the operation became complicated.

  In particular, when you enter another country across borders in Europe, etc., the station in the previous country will remain on the station list for a while, even though you are already traveling in another country. . Moreover, in a receiver with a single tuner configuration, the above problem becomes significant because the period for detecting a broadcast station cannot be shortened so much in order to maintain the quality of output audio. On the other hand, in the receiver disclosed in Patent Document 2, since the station list is created using the sub-tuner, the station list update cycle can be shortened. In some cases, a configuration with multiple tuners cannot be adopted, so a simple configuration can prevent a station in the previous country from having a bad reception status in the station list when entering another country. Is desired.

  The present invention was created in view of the above points, and its purpose is to have a simple configuration, and when receiving from a country to another country, the reception state is poor from the broadcast station list (station list). The object is to provide a radio receiver capable of quickly deleting a broadcasting station in a country before entering.

  In order to solve the above-described problems, a radio receiver according to the present invention is a radio receiver mounted on a vehicle entering a second country from a first country, and a broadcast signal receiving unit that receives a broadcast signal; Broadcast station list creation means for creating a broadcast station list indicating broadcast signals receivable by the broadcast signal reception means, and first detection operation for detecting the reception state of broadcast signals of each frequency included in the reception frequency band. 1 reception state detection means, an entry determination means for determining whether or not the vehicle has entered the second country from the first country based on the result of the detection operation by the first reception state detection means, and an entry determination means The second reception state detection for performing the second detection operation for detecting the reception state of the broadcast signal of the broadcasting station of the first country included in the broadcasting station list when it is determined that the mobile station has entered the second country. Means and first and first And a broadcast station list update means for updating the contents of the broadcast station list on the basis of the reception state detecting means according to the detection operation result. In particular, the broadcast signal receiving means desirably has a single tuner configuration that can simultaneously receive one broadcast signal.

  When entering the second country from the first country, it is possible to quickly confirm the reception status of the broadcast signal of the broadcasting station of the first country before the entry twice. Broadcasting stations in other countries can be deleted promptly. In particular, since it is not necessary to shorten the repetition cycle of the operation for detecting the reception state of the broadcast signal of each frequency included in the reception frequency band, frequent or prolonged interruption of audio output is unnecessary, and a simple configuration Specifically, it is possible to have a single tuner configuration that can simultaneously receive one broadcast signal.

  In addition, it is desirable that the entry determination means described above determines that the vehicle has entered the second country when the number of broadcasting stations in the second country in a good reception state reaches a predetermined threshold. By examining the number of broadcasting stations in the second country that increase when entering the second country, it is possible to easily and reliably determine that the vehicle has entered the second country.

  In addition, the above-described broadcast station list updating unit is configured to display a broadcast station of a broadcast signal whose reception status is confirmed a plurality of times based on the detection operation results of the first and second reception status detection units. It is desirable to delete from. Thereby, the broadcasting station of the first country whose reception state has deteriorated due to entering the second country can be deleted from the broadcasting station list accurately and promptly.

  In addition, the above-described broadcast station list update unit may add a broadcast station of a broadcast signal confirmed to be receivable to the broadcast station list based on the result of the detection operation by the first reception state detection unit. desirable. As a result, a broadcasting station having a good reception state can be quickly added to the broadcasting station list.

  In addition, it is desirable that the second reception state detection means described above detects the reception state of the broadcast signal only for the first country broadcast stations included in the broadcast station list. Thereby, the second reception state detection can be performed in a short time, and the time for interrupting the voice output can be minimized.

  In addition, it is desirable that the second reception state detection means described above detects the reception state of the broadcast signal of each frequency within the reception frequency band including the broadcast signal of the broadcasting station in the first country. Thus, although it takes more time than a case where only the broadcasting station in the first country is targeted, it is possible to accurately delete or add a broadcasting station in the broadcasting station list.

  In addition, an operation unit that receives an instruction from the user is further provided, and the detection operation by the first reception state detection unit is performed when a predetermined operation corresponding to the instruction from the user received by the operation unit is executed. Is desirable. In particular, it further comprises audio output means for outputting sound corresponding to the above-mentioned broadcast signal, and silence processing means for maintaining the output sound of the audio output means in a silent state, and the predetermined operation is performed by the silence processing means. It is desirable to accompany the operation of maintaining silence. The predetermined operation described above is preferably a seek operation in which the operation of sweeping the reception frequency in one direction in the broadcast signal receiving means is performed until a broadcast signal with a good reception state is detected. Alternatively, the predetermined operation described above is preferably a scan operation that sweeps the reception frequency in the broadcast signal receiving means in one direction and detects a broadcast signal having a good reception state in the reception band. The predetermined operation described above is preferably an operation for switching the audio output source to a device other than the radio receiver. As a result, it is possible to minimize the influence without affecting the output operation of the program sound, and to prevent the user from feeling uncomfortable or uncomfortable.

  In addition, when the second country includes a plurality of countries, the entry determination means described above may be set in the second country when the number of broadcasting stations reaches a predetermined threshold in any of the plurality of countries. It is desirable to determine that the vehicle has entered. Thereby, even in a place where a plurality of countries are intricately complicated, it can be reliably determined that the user has moved away from the first country and entered another country.

  In addition, the operations by the first reception state detection unit, the entry determination unit, the second reception state detection unit, and the broadcast station list update unit described above correspond to each of a plurality of values having different sizes as predetermined threshold values. It is desirable to be performed multiple times. As a result, it is possible to reliably prevent the broadcast station in the country before entering that has a bad reception state from remaining in the broadcast station list.

It is a figure which shows the structure of the radio receiver of one Embodiment. It is explanatory drawing of the basic baseband coding structure of RDS data. It is a flowchart which shows the operation | movement procedure which updates the content of a broadcast station list after a vehicle approachs the 2nd country from the 1st country. It is a figure which shows the specific example of broadcast station list update operation | movement. It is a flowchart which shows the operation | movement procedure of the modification which performed reception state detection and determination, when the number of the broadcasting stations of the 2nd country in a broadcasting station list reached each of two threshold value N1, N2. It is a figure which shows the modification of broadcast station list update operation | movement. It is a flowchart which shows the other modification of broadcast station list update operation | movement.

  Hereinafter, a radio receiver according to an embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a radio receiver according to an embodiment. The radio receiver shown in FIG. 1 is mounted on a vehicle and receives an RDS broadcast, and includes an antenna 10, a front end (F / E) 12, an intermediate frequency amplifier (IFA) 14, and a reception state detection unit 16. , Demodulator 20, amplifier 22, speaker 24, RS decoder 30, controller 40, broadcast station list storage 50, display 60, and operation unit 62. This radio receiver has a single tuner configuration for receiving one broadcast signal.

  In RDS broadcasting, 57 kHz, which is the third harmonic of the 19 kHz stereo pilot signal, is used as a subcarrier, and the subcarrier is amplified by a data signal indicating data related to program-related information or traffic information that is filtered and two-phase coded. Radio data (RDS data) is modulated and the amplitude-modulated subcarrier is frequency-modulated to the main carrier and broadcast.

  FIG. 2 is an explanatory diagram of a basic baseband coding structure of RDS data. As shown in FIG. 2, the RDS data is composed of groups of 104 bits as one group, and each group is composed of 4 blocks (A, B, C, D), and each block is a 16-bit information word. (M0 to m15) and 10-bit check words and offset words (C′0 to C′9).

  In block A, program identification data (PI code: Program Identification Code) indicating a network including country name data and program data is arranged. This PI code is composed of three elements: 4-bit country name data, 4-bit regional data, and 8-bit program data. Block B includes traffic information broadcasting station identification data (TP code: Traffic program Identification code) indicating a traffic information broadcasting station that broadcasts a traffic information program, and program content identification data (PTY code: Program) indicating the type of program. Type code) is arranged. In block C, data relating to the frequency of each station in the network station group broadcasting the same program, that is, alternative frequency data (AF data: Alternative Frequency code) is arranged. In the block D, broadcasting station name data (PS data: Program Service code) such as a broadcasting station name and a network name is arranged.

  The front end 12 extracts a desired broadcast signal from broadcast signals received via the antenna 10 and performs frequency conversion to generate an IF signal (intermediate frequency signal) corresponding to the broadcast wave. Note that the radio receiver of this embodiment has a single tuner configuration, and the front end 12 receives only one broadcast signal. The intermediate frequency amplifier 14 amplifies the IF signal output from the front end 12. The reception state detection unit 16 detects the reception state of the broadcast signal based on the IF signal output from the intermediate frequency amplifier 14. For example, the signal strength of the IF signal, the presence / absence of multipath occurrence, and the presence / absence of adjacent interference occurrence are detected as reception states.

  The demodulator 20 performs FM demodulation processing and stereo demodulation processing based on the IF signal input from the intermediate frequency amplifier 14. RDS data including a PI code and program content identification data (TYP) is superimposed on the data after FM demodulation. The audio signal stereo-demodulated by the demodulator 20 is amplified by the amplifier 22 and an audio sound is output from the speaker 24.

  The RDS decoder 30 performs a predetermined decoding process on the data demodulated by the demodulator 20 and restores the RDS data. Further, the RDS decoder 30 performs an operation of detecting an error in the RDS data while maintaining block synchronization and correcting the error. Normally, RDS data error detection and correction operations are separate from the RDS data decoding process, and a separate error detection / correction unit is provided.

  The control unit 40 controls the entire radio receiver. The control unit 40 includes a CPU, a RAM, a ROM, and the like, and performs various operations by executing a predetermined program. For example, a station selection operation for selecting and receiving a program, a seek operation or scanning operation for searching for a receivable broadcast signal by sweeping the frequency in one direction, and a broadcast station list (station list) indicating a receivable broadcast signal. An operation of creating / updating is performed under the control of the control unit 40. For this purpose, the control unit 40 includes a channel selection processing unit 41, a broadcast station list creation unit 42, reception state determination units 43 and 45, an entry determination unit 44, a seek processing unit 46, a scan processing unit 47, a mute processing unit 48, A broadcast station list update unit 49 is provided.

  The channel selection processing unit 41 sets the reception frequency corresponding to the received program after switching to the front end 12 when a channel selection instruction (reception program switching instruction) is given by the user using the operation unit 62. Do it. For example, the channel selection instruction is performed by displaying a plurality of broadcast stations registered in the broadcast station list and selecting a broadcast station to be switched from among them.

  The broadcast station list creation unit 42 creates a broadcast station list indicating receivable broadcast signals. This broadcast station list includes a PI code corresponding to a broadcast signal of each broadcast station, a reception frequency, a reception state, and the like. The created broadcast station list is stored in a broadcast station list storage unit 50 composed of a semiconductor memory, a hard disk device, or the like.

  The reception state determination unit 43 determines the reception state of the broadcast signal of each frequency included in the reception frequency band. This determination is performed according to the signal strength of the IF signal detected by the reception state detection unit 16, the presence / absence of multipath generation, and the presence / absence of adjacent interference. Further, when the first determination operation by the reception state determination unit 43 is performed immediately after the radio receiver is mounted on the vehicle and connected to the power source (battery), a broadcast station list is created based on the determination result.

  The entry determination unit 44 determines whether a vehicle equipped with a radio receiver has entered the second country from the first country based on the determination result by the reception state determination unit 43. Specifically, the entry determination unit 44 determines that the vehicle has entered the second country when the number of broadcasting stations in the second country in good reception reaches a predetermined threshold (for example, five). . In this embodiment, it is assumed that a vehicle traveling in a certain country enters another country across the border. The country before the border is referred to as the “first country”, and after the border is crossed. Other countries are designated as “second countries”.

  The reception state determination unit 45 determines the reception state of the broadcast signal of the broadcast station in the first country included in the broadcast station list when the entry determination unit 44 determines that the vehicle has entered the second country. Similar to the reception state determination unit 43 described above, this determination is performed according to the signal strength of the IF signal detected by the reception state detection unit 16, the presence / absence of multipath generation, and the presence / absence of adjacent interference.

  The seek processing unit 46 sweeps the reception frequency of the front end 12 in one direction when a user gives a seek instruction using the operation unit 62, and the reception state is good based on the detection result of the reception state detection unit 16. When a broadcast signal is detected, the sweep of the reception frequency is stopped.

  The scan processing unit 47 sweeps the reception frequency of the front end 12 in one direction when a scan instruction is given by the user using the operation unit 62, and the reception state is good based on the detection result of the reception state detection unit 16. When a broadcast signal is detected, the front end 12 is set to maintain the reception frequency at this time for a predetermined time. As a result, an audio signal corresponding to the broadcast signal program is output from the speaker 24 for a predetermined time. After a predetermined time has elapsed, the frequency sweep is resumed. The frequency sweep operation and the broadcast signal reception operation for a predetermined time, the sweep frequency makes a round (for example, when the sweep frequency reaches the upper limit value (or lower limit value) of the reception band, the frequency is the lower limit value (or upper limit value). Until the frequency sweep is continued), or until the user receives an instruction to receive the broadcast signal by operating the operation unit 62 during the broadcast signal reception operation.

  The mute processing unit 48 sends an instruction to the demodulating unit 20 in parallel with the seek operation by the seek processing unit 46 and the scan operation by the scan processing unit 47 so that the audio sound (output sound) output from the speaker 24 is silenced. Performs mute processing.

  The broadcast station list update unit 49 updates the content of the broadcast station list as necessary when the reception state of the broadcast signal is detected by the reception state detection unit 16. For example, when the reception state of each broadcast signal is determined by the reception state determination units 43 and 45, a broadcast station is added to the broadcast station list for a newly detected broadcast signal with a good reception state. For broadcast signals whose reception status has deteriorated and normal reception has become difficult, the broadcast stations are deleted from the broadcast station list. The process of deleting a broadcast station from the broadcast station list is performed after confirming that the reception state of the broadcast signal has deteriorated a plurality of times (for example, twice). This is because when the radio wave condition is temporarily deteriorated when traveling near a high building, the broadcast station is not mistakenly deleted from the broadcast station list.

  When the display target data is included in the RDS data, the display unit 60 displays this data, and displays channel selection information necessary for control by the control unit 40, the contents of the broadcast station list, and the like. The operation unit 62 is for receiving instructions from the user, and includes various input keys and operation knobs. The operation unit 62 is also used to switch to an audio output source (for example, a CD player, a TV tuner, etc.) 100 other than the radio receiver, and to accept an instruction from the user for these.

  The antenna 10 and the front end 12 described above are received by the broadcast signal receiving means, the intermediate frequency amplifier 14, the demodulating unit 20, the amplifier 22, and the speaker 24 are received by the audio output means, and the broadcast station list creating unit 42 is received by the broadcast station list creating means. The state detection unit 16 and the reception state determination unit 43 are the first reception state detection unit, the entry determination unit 44 is the entry determination unit, and the reception state detection unit 16 and the reception state determination unit 45 are the second reception state detection unit. The mute processing unit 48 corresponds to the silence processing unit, the broadcast station list update unit 49 corresponds to the broadcast station list update unit, and the operation unit 62 corresponds to the operation unit.

  The radio receiver of this embodiment has such a configuration, and the operation thereof will be described next. FIG. 3 is a flowchart showing an operation procedure for updating the contents of the broadcast station list after the vehicle enters the second country from the first country. While any one of the broadcast signals is being received when the vehicle is traveling (step 100), the reception state determination unit 43 determines whether it is time to detect the reception state of the broadcast signals of all frequencies within the reception band (step 102). . If it is not the detection timing, a negative determination is made, and the process returns to step 100 to continue receiving the broadcast signal.

  In the present embodiment, it is assumed that when performing a predetermined operation in accordance with a user instruction received by the operation unit 62, an operation of detecting the reception state of all frequency broadcast signals is performed. This predetermined operation includes a seek operation accompanied by a mute process, a scan operation, and an operation of switching to another audio output source 100. In the seek operation and scan operation, even if an operation for detecting the reception state of all frequencies is performed before, during, or during the operation, the mute process is in progress, so the audio output is not interrupted, and the user feels uncomfortable or uncomfortable. It does not give pleasure. In addition, when switching to another audio output source 100, since the operation for detecting the reception state of all frequencies can be performed in the background, the audio output is not interrupted, and the user feels uncomfortable. There is no discomfort. If the detection timing has arrived, an affirmative determination is made in the determination of step 102.

  Next, the reception state determination unit 43 sends an instruction to the front end 12 to sweep the reception frequency in one direction, and based on the detection result of the reception state detection unit 16, the broadcast signal of each frequency included in the reception frequency band Is determined (step 104). The broadcast station list update unit 49 updates the contents of the broadcast station list based on the determination result (step 106). As described above, since the addition of a broadcast station to the broadcast station list is performed based on one reception state determination result and the deletion of a broadcast station is performed based on two reception state determination results, in step 104 In the broadcast station list content update based on the first reception state determination, a broadcast station that is newly determined to have a good reception state of the broadcast signal is added. If the determination that the reception state is bad has already been made once, and the second determination that the reception state is bad is made in the reception state determination in step 104, then in the update of the broadcast station list in step 106 This broadcast station is deleted.

  Next, the entry determination unit 44 determines whether or not the broadcasting stations registered in the broadcasting station list include at least a predetermined threshold N1 of broadcasting stations with PI codes in the second country (whether N1 has been reached). It is determined whether or not (step 108). As a premise, it is necessary to recognize the first country in which the vehicle is traveling. This first country is based on the PI code with the largest number among the PI codes included in the pre-update broadcasting station list. Can be determined. If N1 is not reached, a negative determination is made in step 108, and the process returns to step 100 to continue the broadcast signal reception operation.

  If the number of PI code broadcasting stations in the second country reaches N1, an affirmative determination is made in step 108. When a plurality of countries are included in the second country, an affirmative determination is made when the number of broadcasting stations in any of the plurality of countries reaches N1. Next, the reception state determination unit 45 sends an instruction to the front end 12 to sequentially set the reception frequency to the frequency of the first country broadcast station included in the broadcast station list, and the detection result of the reception state detection unit 16 Based on the above, the reception state of the broadcast signal of each frequency is determined (step 110). Also, the broadcast station list update unit 49 updates the contents of the broadcast station list based on the determination result (step 112). In the update of the broadcast station list this time, among the broadcasters in the first country, it is determined that the reception state is bad in both the first reception state determination in step 106 and the second reception state determination in step 110. The broadcast station of the first country that was performed is deleted. Thereafter, the process returns to step 100 and the broadcast signal reception operation is continued.

  FIG. 4 is a diagram showing a specific example of the broadcast station list update operation. For example, it is assumed that a broadcast station list created when traveling at a point A in Italy is stored in the broadcast station list storage unit 50. Assume that a vehicle enters Switzerland (second country) from Italy (first country). A number such as “5111” indicates a 4-digit PI code in hexadecimal.

  After entering Switzerland, the reception status of each frequency broadcast signal included in the reception frequency band is determined at point B (step 104 in FIG. 3). As a result, five broadcast stations (PI codes 4111, 4333, 4444, 4666, 4777) in Switzerland (second country) in good reception are detected and added to the broadcast station list (step 106 in FIG. 3). . In addition, it is determined that the reception status of each Italian broadcast station (PI code 5111, 5333, 5444, 5666, 5777, 5888, 5000) included in the broadcast station list is bad (bad reception environment). Is done.

  If the predetermined threshold value N1 is 5, the number of broadcasting stations in the second country has reached N1, and the second reception state determination for the broadcasting stations in the first country is subsequently performed (FIG. 3). Step 110). Then, for each Italian broadcast station, when a second determination that the reception state is bad (bad reception environment) is made, each of these broadcast stations is deleted from the broadcast station list (step 112 in FIG. 3). Note that the second reception state determination is not necessarily performed immediately after the first reception state determination is completed, and may be performed at an interval (for example, one minute).

  As described above, in the radio receiver according to the present embodiment, when entering the second country from the first country, the reception state of the broadcast signal of the broadcasting station of the first country before the entry can be quickly confirmed twice. Therefore, it is possible to promptly delete the broadcast station in the country before entering that has poor reception from the broadcast station list. In particular, since it is not necessary to shorten the repetition period of the operation for detecting the reception state of the broadcast signal of each frequency included in the reception frequency band (interval for performing the operation of step 104 in FIG. 3), it is frequent or long time. Therefore, a simple configuration, specifically, a single tuner configuration capable of receiving one broadcast signal at the same time can be realized. In particular, it is easy to enter the second country by determining that the second country has entered when the number of broadcasting stations in the second country in good reception reaches a predetermined threshold value N1. It is possible to make a reliable determination.

  Further, based on the detection result of the reception state by the reception state detection unit 16, by deleting from the broadcast station list the broadcast station of the broadcast signal that the reception state determination units 43 and 45 have confirmed that the reception state is bad multiple times. The broadcasting station of the first country whose reception condition has deteriorated due to entering the second country can be deleted from the broadcasting station list accurately and promptly. In addition, since the reception state determination by the reception state determination unit 45 is performed only for the broadcasting stations in the first country included in the broadcast station list, the second reception state detection can be performed in a short time. Even when the voice output is interrupted in the configuration, the interruption time can be minimized.

  In addition, when a plurality of countries are included in the second country, it is determined that the user has entered the second country when the number of broadcasting stations reaches a predetermined threshold N1 in any of the plurality of countries. Therefore, even in a place where a plurality of countries are intricately complicated, it is possible to reliably determine that the country has moved away from the first country and entered another country.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, when the number of broadcasting stations in the second country included in the broadcasting station list reaches a predetermined threshold N1, the broadcasting station in the first country in the broadcasting station list is targeted only once. The reception status is detected and determined, but a plurality of threshold values are set, and when each threshold is reached, the reception status is targeted for the first country broadcasting stations in the broadcasting station list. Detection and determination may be performed.

  FIG. 5 shows an operation procedure of a modified example in which the reception state is detected and determined when the number of broadcasting stations in the second country in the broadcasting station list reaches each of the two threshold values N1 and N2. It is a flowchart. The operation procedure shown in FIG. 5 is different from the operation procedure shown in FIG. 3 in that step 108 is replaced with step 108A. In step 108A, the entry determination unit 44 determines whether the number of broadcasting stations of the PI code of the second country registered in the broadcasting station list has reached a predetermined threshold value N1 or N2 (> N1). . As a result, even if the first country broadcast station list remains due to the first update of the broadcast station list in step 112, the first country broadcast station is updated by the second update of the broadcast station list in step 112. Can be surely prevented from remaining in the broadcasting station list before entering the first country where the reception state is poor.

  FIG. 6 is a diagram illustrating a modification of the broadcast station list update operation. For example, it is assumed that a broadcast station list created when traveling at a point A in Italy is stored in the broadcast station list storage unit 50. Similar to the specific example shown in FIG. 4, when a vehicle enters from Switzerland (second country) into Italy (first country), detection of reception status at point B twice (first time and second time), As a result of the determination, the case where the broadcasting stations (PI codes 5444, 5666, 5000) of the first country remain in the broadcasting station list is shown. In such a case, when the number of broadcasting stations in the second country reaches a threshold value N2 (for example, 10) greater than N1 (affirmative determination in step 108A), broadcasting stations in the first country included in the broadcasting station list The reception status is detected and determined for the target (step 110), and the contents of the broadcast station list are updated (step 112). In the description using FIGS. 5 and 6, two threshold values N1 and N2 are used, but three or more threshold values may be used.

  In the above-described embodiment, the reception state is detected and determined only for the broadcasting stations in the first country included in the broadcasting station list in step 110 of FIG. 3 or FIG. You may make it perform detection and determination of a receiving state about the broadcast signal of a frequency. FIG. 7 is a flowchart showing the operation procedure of the modified example in this case. In the operation procedure shown in FIG. 7, step 110 is replaced with step 110 </ b> A and step 112 is replaced with step 112 </ b> A with respect to the operation procedure shown in FIG. 3. In step 110A, reception status is detected and determined for broadcast signals of each frequency within the reception frequency band, and in step 112A, the contents of the broadcast station list are updated based on the result. Although it takes more time than a case where only the broadcasting stations in the first country are targeted, it is possible to accurately delete or add a broadcasting station in the broadcasting station list.

  In the above-described embodiment, the radio receiver that receives the RDS broadcast has been described. However, the same kind is applied to other radio receivers such as a DAB (Digital Audio Broadcasting) receiver, other AM receivers, and FM receivers. The present invention can be applied when creating and updating a broadcast station list.

  As described above, according to the present invention, when entering the second country from the first country, the reception state of the broadcast signal of the broadcasting station of the first country before the entry can be quickly confirmed twice. , It is possible to quickly delete the broadcast station in the country before the entry with poor reception from the broadcast station list.

10 Antenna 12 Front end (F / E)
14 Intermediate Frequency Amplifier (IFA)
16 reception state detection unit 30 RS decoder 40 control unit 41 channel selection processing unit 42 broadcast station list creation unit 43, 45 reception state determination unit 44 entry determination unit 46 seek processing unit 47 scan processing unit 48 mute processing unit 49 broadcast station list update Section 50 Broadcast station list storage section 60 Display section 62 Operation section

Claims (14)

A radio receiver mounted on a vehicle entering a second country from a first country,
Broadcast signal receiving means for receiving a broadcast signal;
Broadcast station list creating means for creating a broadcast station list indicating broadcast signals receivable by the broadcast signal receiving means;
First reception state detection means for performing a first detection operation for detecting a reception state of a broadcast signal of each frequency included in the reception frequency band;
An entry determination means for determining whether a vehicle has entered the second country from the first country based on a result of the detection operation by the first reception state detection means;
When the entry determination means determines that the vehicle has entered the second country, a second detection operation for detecting the reception state of the broadcast signal of the broadcast station in the first country included in the broadcast station list is performed. Second receiving state detecting means for performing;
Broadcast station list update means for updating the contents of the broadcast station list based on the result of the detection operation by the first and second reception state detection means;
A radio receiver comprising: In claim 1,
The radio receiver according to claim 1, wherein the entry determination means determines that the vehicle has entered the second country when the number of broadcasting stations in the second country in good reception reaches a predetermined threshold value. . In claim 1 or 2,
The broadcast station list updating unit is configured to select, from the broadcast station list, a broadcast station of a broadcast signal that has been confirmed a plurality of times that the reception state is poor based on the detection operation results of the first and second reception state detection units. Radio receiver characterized by being deleted. In claim 3,
The broadcast station list update means adds a broadcast station of a broadcast signal that is confirmed to be receivable to the broadcast station list based on a result of a detection operation by the first reception state detection means. And radio receiver. In any one of Claims 1-4,
The radio receiver according to claim 2, wherein the second reception state detecting means detects a reception state of a broadcast signal only for the broadcasting stations in the first country included in the broadcasting station list. In any one of Claims 1-4,
The radio receiver according to claim 2, wherein the second reception state detecting means detects a reception state of a broadcast signal of each frequency within a reception frequency band including a broadcast signal of the broadcasting station of the first country. In any one of Claims 1-6,
It further comprises an operation means for receiving an instruction from the user,
The radio receiver according to claim 1, wherein the detection operation by the first reception state detection unit is performed when a predetermined operation according to an instruction from a user received by the operation unit is executed. In claim 7,
Audio output means for outputting sound corresponding to the broadcast signal; and silence processing means for maintaining the output sound of the sound output means in a silence state;
The radio receiver according to claim 1, wherein the predetermined operation includes an operation of maintaining the output sound in a silence state by the silence processing means. In claim 8,
The radio receiver according to claim 1, wherein the predetermined operation is a seek operation in which the broadcast signal receiving means sweeps the reception frequency in one direction until a broadcast signal having a good reception state is detected. In claim 8,
The radio receiver according to claim 1, wherein the predetermined operation is a scan operation for sweeping a reception frequency in the broadcast signal receiving means in one direction to detect a broadcast signal having a good reception state in a reception band. In claim 7,
The radio receiver characterized in that the predetermined operation is an operation of switching an audio output source to a device other than the radio receiver. In claim 2,
In the case where a plurality of countries are included in the second country, the entry determination unit is configured to enter the second country when the number of broadcasting stations reaches the predetermined threshold for any of the plurality of countries. A radio receiver characterized by determining that it has entered. In claim 2,
The operations of the first reception state detection unit, the entry determination unit, the second reception state detection unit, and the broadcast station list update unit are performed for each of a plurality of values having different sizes as the predetermined threshold value. Radio receiver characterized by being performed multiple times correspondingly. In any one of Claims 1-13,
The radio signal receiver has a tuner configuration capable of simultaneously receiving one broadcast signal.

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