JP2013175968A - Receiving device, and metho and program for displaying broadcast station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiving device, and a method and a program for displaying broadcast stations promptly providing update information about receivable broadcast stations and not receivable broadcast stations.SOLUTION: A radio receiver for receiving an RDS broadcast causes, while outputting radio broadcasting on one tuner, the other tuner to scan a frequency band in background operations, creates a frequency table in which a receivable frequency is registered, and displays a broadcast station list on the basis of the frequency table. When scanning is performed, such as a processing A for extracting the RDS data or a processing B for determining whether a frequency in the frequency table can be received or not is performed. A broadcast station having the frequency determined as not receivable by the processing B is instantaneously deleted from the broadcast station list.

Description

  The present invention relates to a receiving apparatus mounted on a vehicle such as a moving body, and more particularly to a radio receiving apparatus capable of receiving a broadcast signal in which data is multiplexed.

  In Europe and the like, a radio data system (Radio Data System, hereinafter referred to as RDS) in which various types of data are multiplexed on a radio broadcast signal is put into practical use. The multiplexed data includes information for identifying a broadcast program (PI: Program Identification), information for identifying a program genre (PTY: Program Type), road traffic information by a TMC (Traffic message Channel) service, and the like. . The radio receiving device mounted on the vehicle changes its reception sensitivity with the movement of the vehicle, and when the reception sensitivity of the broadcasting station currently being watched deteriorates, it is necessary to switch to an alternative broadcasting station. In general, an alternative broadcast station having the same PI code as that of the currently watched broadcast station is searched. In this search, one of two tuners is operated in the background. In the background operation, frequency scanning from the lower limit to the upper limit of the reception band is periodically performed, and a broadcast station list in which the broadcast stations are arranged in alphabetical order or in order of strong electric field strength is displayed, making it easy for the user to select a channel. (Patent Document 1).

JP 2011-35883 A

  However, when creating a list of receivable broadcasting stations by scanning frequencies from the lower limit to the upper limit of the reception band as in Patent Document 1, there are the following problems. When one round from the lower limit to the upper limit of the reception band is processed in order to check the presence / absence of a receivable broadcast station, the scan takes a long time. When receiving an RDS broadcast, such a scanning time is proportional to the number of receivable frequencies (broadcast stations). If there are 20 receivable frequencies, it takes about 2 to scan one frequency band. Minutes are required. This means that the broadcast station of the frequency in the broadcast station list reflects the information acquired two minutes ago. In other words, the update cycle of the reception status of the broadcast station takes about two minutes at the maximum. For example, a broadcast station that was receivable two minutes ago may not be receivable now, and even in such a case, it cannot be immediately deleted from the broadcast station list. For this reason, even if the user selects a broadcast station with reference to the broadcast station list, the selected broadcast station cannot be received, and a situation in which only noise is output as voice occurs. In particular, when traveling in an area where reception conditions such as a tunnel and an underground parking lot are rapidly deteriorated, such a problem may occur remarkably because the number of broadcast stations that cannot receive signals increases.

  The present invention solves such a conventional problem, and a receiving apparatus capable of promptly providing a user with update information of a receivable broadcast station and a broadcast station that is not receivable, a display method of the broadcast station, and a display The purpose is to provide a program.

  The receiving device according to the present invention is capable of receiving a broadcast signal in which data is multiplexed and is received by at least first and second receiving means capable of receiving a broadcast signal and the first receiving means. Scanning means for scanning the frequency band by the second receiving means while outputting the broadcast signal, and extracting means for extracting data from the broadcast signal received during the period during which scanning is performed by the scanning means Holding means for holding a frequency table in which receivable frequencies within the frequency band scanned by the scanning means are registered, and display means for displaying broadcast stations corresponding to the frequency table held by the holding means Determining means for determining whether or not a frequency in the frequency table is receivable during a period in which the frequency band is scanned by the scanning means; and Having a deletion means for deleting a broadcast station frequency is determined not to be received by means of the display of the broadcast station.

  Preferably, the determination unit determines that the frequency is not receivable when all the alternative frequencies having the same program identification code as the frequency in the frequency table are not receivable. Preferably, the receiving apparatus further includes a program identification code extracting means for extracting a program identification code from the data extracted by the extracting means, and an alternative in which a frequency for sharing a program identification code is registered based on the extracted program identification code Creation means for creating a frequency table, and the determination means determines whether or not an alternative frequency can be received with reference to the alternative frequency table. Preferably, the determination means has a reception sensitivity of a selected predetermined frequency in the frequency table that is less than a threshold value, and a reception sensitivity of an alternative frequency registered in the alternative frequency table is less than the threshold value. In the case, it is determined that the predetermined frequency is not receivable. Preferably, the determination unit determines that the predetermined frequency is receivable when the reception sensitivity of at least one alternative frequency in the alternative frequency table is equal to or higher than a threshold value. Preferably, while the scanning unit performs scanning from the lower limit to the upper limit of the frequency band or from the upper limit to the lower limit, the determination unit determines whether or not each frequency in the frequency table is receivable by time division. To do. Preferably, the determination means includes means for setting a flag in the frequency table when it is determined that the predetermined frequency is not receivable, and the deletion means responds from the display of the broadcast station based on the set flag. Delete a broadcast station. Preferably, the receiving apparatus further controls selection by the first receiving unit based on a selection unit that selects a broadcasting station from the list of broadcasting stations displayed by the display unit, and the broadcasting station selected by the selection unit. Control means. Preferably, the first and second receiving means receive an RDS broadcast. Preferably, the first and second receiving means receive a digital broadcast.

  The broadcast station display method according to the present invention is in a receiving apparatus capable of receiving a broadcast signal in which data is multiplexed, and while the broadcast signal received by the first receiving means is being output, Scanning a receivable frequency within a frequency band by a second receiving means; extracting data from a broadcast signal received during the period of the scan; and the scanned frequency band A frequency table in which receivable frequencies are registered, a broadcast station corresponding to the held frequency table is displayed, and the frequency band is scanned during the period in which scanning is performed. A step of determining whether or not a frequency in the table is receivable, and a broadcast station having a frequency determined to be unreceivable by the determining step And a step to be removed from the display.

  The broadcast station display program according to the present invention is executed by a receiving apparatus capable of receiving a broadcast signal in which data is multiplexed, and while the broadcast signal received by the first receiving means is being output. A step of scanning a receivable frequency within a frequency band by a second receiving means, a step of extracting data from a broadcast signal received during the period during which the scanning is performed, and the step of scanning A step of holding a frequency table in which receivable frequencies in a frequency band are registered, a step of displaying a broadcasting station corresponding to the held frequency table, and a period during which scanning of the frequency band is performed, Determining whether or not a frequency in the frequency table is receivable, and a broadcast station having a frequency determined to be unreceivable by the determining step And a step to be removed from the display of broadcast stations.

  According to the present invention, it is determined whether or not the frequency in the frequency table is receivable while scanning the frequency band. If it is determined that the frequency is not receivable, the broadcast station is deleted from the display of the broadcast station. Instead of waiting for the display of the broadcast station to be updated when scanning of the entire frequency band is completed as in the prior art, the broadcast station is promptly detected when a broadcast station that cannot be received is found. The display of can be updated. This provides the user with the latest reliable indication of receivable broadcast stations and reduces the probability that the user will not be able to receive the broadcast station when the user selects the broadcast station. can do.

FIG. 1A is a diagram illustrating an example of an in-vehicle electronic system according to an embodiment of the present invention, and FIG. 1B is a block diagram illustrating a configuration of a radio receiving apparatus according to the embodiment of the present invention. It is a block diagram which shows a part of function contained in the control part shown to FIG. 1 (B). It is an example of the frequency table which registered the frequency which can be received. It is an example of the alternative frequency table which prescribed | regulated the relationship between PI code and an alternative frequency. It is a display example of a broadcast station list. It is an example of the frequency table containing a reception determination flag. It is a graph explaining the process at the time of the scanning in the radio receiver which concerns on the Example of this invention. It is a flow explaining the production | generation operation | movement of the frequency table in the radio receiver which concerns on the Example of this invention. It is a flow which determines the receiving sensitivity of the frequency in the frequency table in the radio receiver which concerns on the Example of this invention. It is a flow explaining the production | generation operation | movement of the broadcast station list which concerns on the Example of this invention. It is a flow explaining the update operation | movement of the broadcast station list which concerns on the Example of this invention. It is a figure which compares the update timing of the broadcast station list by the conventional radio receiver with the update timing of the broadcast station list by the Example of this invention. It is a figure which compares the display of the broadcast station list in the conventional radio receiver with the display of the broadcast station list by the Example of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. A preferred embodiment of the present invention exemplifies a radio receiving device mounted on an automobile as a moving body. In addition, the radio reception apparatus can receive a radio broadcast in which data is multiplexed. Here, as an example, the radio reception apparatus receives an RDS broadcast.

  FIG. 1A is a diagram illustrating a configuration of an in-vehicle electronic system according to an embodiment of the present invention. The on-vehicle electronic system 10 includes a radio receiver 20 mounted on a vehicle and a navigation device 30. The radio receiver 20 receives a radio broadcast selected by the user, and road traffic information included in data superimposed on the radio broadcast is provided to the navigation device 30. In RDS broadcasting, digital data (RDS data) is superimposed on an analog FM broadcast signal. This RDS data includes a PI code for identifying a broadcast program, a broadcast program name, a broadcast program genre, road traffic information by a TMC service, and the like. It is included.

  The road traffic information acquired by the radio receiving device 20 is provided to the navigation device 30, and the navigation device 30 can display the acquired road traffic information on a road map or use it for voice guidance. An in-vehicle electronic system 10 shown in FIG. 1A represents one configuration example, and includes a television receiver, a DVD / Blu-ray disc playback device, a multi-function terminal (smartphone), and the like. It may also have only a radio receiver.

  FIG. 1B is a block diagram illustrating a configuration of the radio receiving apparatus according to the present embodiment. The radio receiver 20 includes a first tuner 110A, a second antenna 100B, and a second antenna that receive a broadcast signal of a frequency (broadcast station) selected via the first antenna 100A and the first antenna 100A. Receives reception signals from second tuner 110B that receives a broadcast signal of a selected frequency (broadcast station) via 100B, and first and second tuners 110A and 110B, and performs necessary processing on each reception signal. The signal processing unit 120, the amplifier 130 that amplifies the audio signal processed by the signal processing unit 120, the speaker 132 that outputs the audio signal amplified by the amplifier 130, the data decoded by the signal processing unit 120, and the like can be displayed Display unit 140, storage unit 150, input unit 160 that receives input from the user, navigation device 30 includes an interface (I / F) unit 170 that enables connection with an external device such as 30, first and second tuners 110 </ b> A and 110 </ b> B, a signal processing unit 120, an amplifier 130, and the like. Is done.

  As is known, the first tuner 110A receives an RF signal from the first antenna 100A, an RF amplifier that amplifies the RF signal, a tuning circuit that selects a frequency signal of a desired station from the amplified RF signal, and a local oscillator A mixer that generates an intermediate frequency (IF) signal by mixing the frequency signal from the RF signal and an RF signal, and an S meter circuit that DC-detects the intermediate frequency signal and extracts a received electric field strength signal (S meter signal). . However, the reception sensitivity may be determined using a C / N value (Carrier to noise) in addition to the electric field strength signal. Further, the first tuner 110 </ b> A converts the intermediate frequency signal (IF) and the S meter signal into digital signals by an ADC (analog / digital converter), and outputs them to the signal processing unit 120 and the control unit 180. The second tuner 110B is also configured similarly to the first tuner 110A. The first and second tuners 110A and 110B can select the same frequency or different frequencies in accordance with an instruction from the control unit 180. In the preferred embodiment of this embodiment, the first tuner 110A uses the first and second tuners 110A and 110B. When a radio broadcast is being viewed, the second tuner 110B scans the frequency band by a background operation, and checks for receivable frequencies and extracts RDS data.

  The signal processing unit 120 is configured using, for example, a DSP (Digital Signal Processor). The signal processing unit 120 can perform signal processing such as FFT, digital filtering, signal synchronization, time / frequency deinterleaving, audio decoding, data decoding, and phase diversity. These signal processes can be controlled using software stored in a program memory in the signal processing unit 120. In a preferred embodiment, the signal processing unit 120 includes a DAC (digital / analog converter), extracts a voice signal from the digital signal received from the first tuner 110A, converts this into an analog signal, and outputs the voice signal. To the amplifier 130. Further, the signal processing unit 120 extracts RDS data from the signal received from the second tuner 110B, and enables various processes on the RDS data. For example, a PI code, a program service name (PS), road traffic information, and the like are extracted from the RDS data and provided to the control unit 180.

  The control unit 180 is composed of, for example, a microcontroller and controls each unit by executing a program stored in a memory. In a preferred operation mode, the control unit 180 causes the second tuner to scan the frequency band by background processing while the first tuner 110A receives the radio broadcast, and the RDS data is transmitted via the signal processing unit 120. To get.

  FIG. 2 shows functional blocks of the control unit 180 of this embodiment. In the figure, a control unit 180 signals a frequency scanning unit 200 that causes the second tuner 110B to scan the entire frequency band at a constant frequency interval during background processing, and RDS data extracted when the frequency band is scanned. The RDS data acquisition unit 202 acquired via the processing unit 120, the PI code extraction unit 204 that extracts the PI code from the acquired RDS data, and the frequency that makes the PI code the same based on the extracted PI code are registered. An alternative broadcast station creation unit 206 that creates an alternative frequency table, an alternative broadcast station holding unit 208 that holds the created alternative frequency table, and a field strength signal received when scanning the frequency band is a threshold. A frequency table that discriminates frequencies that are equal to or greater than the value and creates a frequency table that registers such receivable frequencies. A creation unit 210; a frequency table holding unit 212 that holds the created frequency table; and a broadcast station display unit 214 that displays a list of broadcast stations that can be received based on the frequency table held by the frequency table holding unit 212. During the period of scanning the frequency band, the reception sensitivity determination unit 216 that individually determines whether or not the frequency in the frequency table is receivable, and the reception sensitivity determination unit 216 determines that reception is not possible. A broadcasting station deletion unit 218 that deletes a broadcasting station corresponding to the frequency from the broadcasting station list.

  While the first tuner 110A is listening to the radio broadcast, the frequency scanning unit 200 sets the frequency band predetermined by the second tuner 110B from the upper limit to the lower limit or from the lower limit to the upper limit at regular frequency intervals. Scan and check for receivable frequencies. Whether or not the frequency is receivable is determined to be receivable if the electric field strength signal from the second tuner 110B is equal to or greater than a threshold value. The scanning result of the frequency scanning unit 200 is sequentially provided to the frequency table creation unit 210.

  When a receivable frequency is detected by the frequency scanning unit 200, RDS data multiplexed on the broadcast signal of the frequency is extracted by the signal processing unit 120, and the extracted RDS data is provided to the RDS data acquisition unit 202. The Then, the PI code extraction unit 204 extracts a PI code that is program identification information of the currently received frequency from the RDS data. The extracted PI code is provided to the frequency table creation unit 210.

  The frequency table creation unit 210 receives the frequency that can be received by the frequency scanning unit 200 and the PI code extracted by the PI code extraction unit 204, and creates a frequency table in which the frequency and the PI code are paired. When receiving European FM broadcasting, the second tuner 110B scans the frequency band from 108.0 MHz to 87.5 MHz at an interval of 100 KHz, and the receivable frequency is determined therefrom. FIG. 3 is an example of a frequency table in which frequencies determined to be receivable are registered. In the frequency table, a relationship between a receivable frequency and a PI code corresponding to the frequency is defined. The frequency table is updated so that a receivable broadcast station is found every time a receivable broadcast station is found during scanning of all frequency bands. In this embodiment, as described later, During the scanning period, the reception sensitivity of each frequency registered in the frequency table is determined, and the determination result is reflected in the frequency table as needed.

  The alternative broadcast station creation unit 206 creates an alternative frequency table based on the PI code extracted by the PI code extraction unit 204. The alternative frequency table is a table in which frequencies having the same PI code are registered. In other words, the alternative frequency table is a table for identifying a broadcast station that distributes the same broadcast program as the currently received broadcast station. FIG. 4 shows an example of the alternative frequency table. For example, in the alternative frequency table 220, the current frequency is 98.5 MHz and its PI code is D303 (see FIG. 3). Alternative frequencies having D303 as the PI code are 92.3 MHz, 94.3 MHz, 99.7 MHz, and 107.5 MHz represented by AF (1) to AF (4). In the alternative frequency table 220, “BAYERN 3” is registered as the program service name (PS). Such an alternative frequency table is created for at least the frequencies included in the frequency table shown in FIG.

  The broadcasting station display unit 214 refers to the PS of the frequency table and the alternative frequency table shown in FIG. 3 and displays a broadcasting station list corresponding to receivable frequencies. FIG. 5 is a display example of a broadcast station list. In this broadcast station list, a list 230 of program service names of frequencies that can be received is displayed in a column 230 that displays the name of a program service that is currently received, and a list column 240 below the column 230. In the list column 240, an identification display 242 is attached to the broadcast program currently being received. The broadcast station list may also display broadcast program genres and frequencies as information other than the program service name.

  The reception sensitivity determination unit 216 determines whether or not the frequencies included in the frequency table shown in FIG. 3 can be received. Although details of this determination method will be described later, it should be noted that the determination is performed in a time division manner during scanning of the frequency band by the frequency scanning unit 200. The determination result of the reception sensitivity determination unit 216 is provided to the broadcast station deletion unit 218, and the broadcast station deletion unit 218 deletes broadcast stations that cannot be received from the broadcast station list. As a preferred example, the determination result of the reception sensitivity determination unit 216 is represented by a reception determination flag associated with a frequency table as shown in FIG. “1” is receivable, and when it is determined that reception is not possible, the flag of the frequency is changed to “0”. When the reception determination flag is changed to “0”, the broadcast station deletion unit 218 deletes the broadcast station corresponding to the frequency from the broadcast station list shown in FIG.

  Next, the operation of the radio receiving apparatus according to the embodiment of the present invention will be described. FIG. 7 is a graph for explaining processing performed during scanning of the second tuner 110B that is operated in the background. The vertical axis is frequency, and the horizontal axis is time. The upper limit of the frequency band is 108.0 MHz, the lower limit is 87.5 MHz, and an example in which scanning from the upper limit to the lower limit is performed three times is schematically shown. Process A is extraction of RDS data from the RDS broadcast station, process B is determination of reception sensitivity of frequencies registered in the frequency table, and process C is extraction of road traffic information from the TMC broadcast station. .

  First, when scanning by the frequency scanning unit 200 is started and it is determined that the frequency f1 can be received, a broadcast signal of the RDS broadcast station is received, and processing A for extracting RDS data from the broadcast signal is performed. The RDS data includes, for example, a PI code, information (PTY) for identifying a program genre, a program service name, a traffic program identification (TP), and the like. FIG. 7 shows only the process A at the frequency f1, but the process A is similarly performed for other receivable frequencies. Each time a receivable broadcasting station is found during scanning of the frequency band, the frequency and PI code are registered in the frequency table as shown in FIG. 6, and the reception determination flag is set to “1”, and once in all frequency bands. When the scanning is completed, a frequency table as shown in FIG. 3 or 6 is completed.

  FIG. 8 is a flowchart for explaining the operation of creating a frequency table by the frequency scanning unit. The frequency of the second tuner 110B is changed by the frequency scanning unit 200 (S101), and the electric field strength signal of the frequency received by the second tuner 110B is provided to the control unit 180 (S102). The control unit 180 determines whether or not the electric field strength signal is equal to or higher than the threshold value (S103). If the electric field strength signal is equal to or higher than the threshold value, the control unit 180 determines that the frequency is receivable (S104). It is determined whether or not the frequency broadcast station is an RDS broadcast station (S105). If it is an RDS broadcasting station, as shown in FIG. 7, RDS data is extracted in process A (S106), and the frequency and PI code are registered in the frequency table (S107). If the frequency reaches the upper limit or lower limit frequency of the frequency band (S108), the scan is terminated and the next scan is started again.

  Returning to the graph of FIG. 7 again, when the process A is completed, a process B for determining whether or not the frequency registered in the frequency table is receivable is performed. It is arbitrary from which frequency in the frequency table the determination is started. For example, if scanning is performed in order from the highest frequency, reception sensitivity is checked from the highest frequency in the frequency table. FIG. 7 shows how the reception sensitivity of the frequency f7 registered in the frequency table is determined. This process B is performed in a time-division manner by the reception sensitivity determination unit 216 while scanning the frequency band by the frequency scanning unit 200.

  FIG. 9 is a processing flow for determining the reception sensitivity of the frequency in the frequency table. The reception sensitivity determination unit 216 selects one frequency from a plurality of frequencies registered in the frequency table (S201), and checks whether the electric field strength signal of the frequency is equal to or higher than a threshold value (S202). ). At this time, the second tuner 110 </ b> B is tuned to a frequency whose reception sensitivity should be determined under the control of the control unit 180. If the electric field strength signal is equal to or greater than the threshold value, the frequency is receivable, so the next frequency is selected from the frequency table and the reception sensitivity of the frequency is determined. The determination is made in the process B assigned to the next time division period.

  If the electric field strength signal is less than the threshold value, an alternative frequency table is searched based on the PI code corresponding to the frequency (S203), and an alternative frequency registered in the alternative frequency table is selected (S204). The reception sensitivity for the alternative frequency is determined (S205). For example, when it is determined that the electric field strength signal of the frequency 98.5 MHz in the frequency table shown in FIG. 3 is less than the threshold value, the alternative frequency table corresponding to the PI code “D303” of the frequency (see FIG. 4) Is searched. Since the four alternative frequencies AF (1) to AF (4) are registered in this alternative frequency table, the reception sensitivity for these four alternative frequencies is determined. This determination is based on whether the second tuner 110B is tuned to the alternative frequency in the same manner as described above and the electric field strength signal at that time is equal to or higher than the threshold value.

  When the reception sensitivity of all the alternative frequencies is deteriorated, that is, when the electric field strength signals of all the alternative frequencies are less than the threshold value (S206), it is determined that the frequency selected in the frequency table is not receivable. (S207). The reception sensitivity determination unit 216 changes the reception determination flag of the corresponding frequency to “0” (S208), and the broadcast station display list is updated in response to this, that is, the broadcast station deletion unit 218 sets the flag “0”. "Is deleted from the broadcast station list (S209). On the other hand, if the electric field strength signal of any alternative frequency is equal to or greater than the threshold value, it is determined that the frequency selected in the frequency table is receivable, and the next frequency is selected from the frequency table (S201). ). If there is an undetermined frequency in the frequency table (S210), the process returns to step S201, and if there is no undetermined frequency remaining, the process ends. The process B for determining the reception sensitivity of the frequency registered in the frequency table is executed in a time division process in parallel with the scanning of the frequency band by the frequency scanning unit 200.

  Returning to FIG. 7 again, next, processing C for extracting road traffic information (TMC data) transmitted by the TMC broadcast station is executed at the frequency f2. Thereafter, processing B for extracting road traffic information at the frequencies f6 and f7 is executed. When the first scan is finished, the second tuner 110B starts the second scan. If the number of receivable frequencies is large, the time required for one scan becomes longer. For example, if the receivable frequency is about 20, one scan requires about 2 minutes.

  Next, the broadcast station list creation operation is shown in the flow of FIG. The broadcast station display unit 214 refers to the frequency table created by the frequency table creation unit 210 and extracts the program service name (PS) corresponding to each frequency from the RDS data (S301). The broadcast station display unit 214 creates a broadcast station list for displaying a list of broadcast station names of currently received frequencies and receivable broadcast station names as shown in FIG. 5 (S302).

  In the process B shown in FIG. 7, when the reception sensitivity determination unit 216 determines that the frequency in the frequency table is not receivable, the reception determination flag is changed to “0” (S303). When the reception determination flag is changed to “0”, the broadcast station deletion unit 218 deletes the broadcast station corresponding to the flag “0” from the broadcast station list (S304).

  FIG. 11 is a flow showing the timing for updating the display of the broadcast station list. The broadcast station display unit 214 refers to the frequency table and displays a broadcast station list including the name of the currently received broadcast station and the receivable broadcast station name (S401). While the broadcast station list is displayed, the frequency scanning unit 200 scans the frequency band, thereby determining the presence or absence of a receivable frequency. In parallel with this, the frequency registered in the frequency table by the reception sensitivity determination unit 216 is displayed. It is determined whether or not reception is possible (S402), and these determination results are reflected in the flag of the frequency table. When the flag is changed to “0” (S403), the broadcast station deletion unit 218 updates the display of the broadcast station list (S404), that is, the broadcast station corresponding to the frequency of the flag “0” from the broadcast station list is updated. delete. When a newly receivable frequency is found by scanning the frequency band, the frequency is registered in the frequency table.

  FIG. 12A schematically shows a conventional broadcast station list display operation, and FIG. 12B schematically shows a broadcast station list display operation according to the present embodiment. In the conventional case, when it is determined that a certain frequency fc is receivable in the scanning of the frequency band, a broadcast station having the frequency fc is displayed in the broadcast station list at time Tr1 in response. The reception state of the frequency fc is updated in the next frequency band scan, that is, the frequency fc of the broadcast station list is updated at time Tr2. If the frequency fc transitions to a state where the frequency fc is not receivable immediately after the time Tr1, the broadcast station list will continue to display the frequency fc in a receivable state until the time Tr2. When the time required for one scan of the frequency band is Ts, the broadcast station update period Td from the time Tr1 to the time Tr2 depends on the one scan period Ts. If the number of frequencies that can be received in one scan is large, the scan period Ts becomes longer and the frequency fc update period Ts becomes longer accordingly.

  On the other hand, in the present embodiment, the reception sensitivity of each frequency in the frequency table is repeatedly determined in a time division manner during scanning of the frequency band. For example, when n frequencies (fa, fb, fc... Fn) are registered in the frequency table, the reception sensitivity of n frequencies is repeatedly checked during one scanning period, and the determination is made. The result is reflected in the frequency table flag. When the frequency fc transitions to a state in which the frequency fc cannot be received immediately after the time Tr1, the determination of the next reception sensitivity of the frequency fc is not performed in the scanning period of the next frequency band as in the prior art, but the frequency table is used. Therefore, the update period Tdx of the frequency fc in the broadcast station list is much shorter than the conventional update period Td. Therefore, if a frequency that is not receivable is found in the frequency table, the broadcast station is immediately deleted from the broadcast station list. As a result, the latest accurate broadcast station list can be presented to the user, and the probability that the user cannot receive the broadcast station when the broadcast station is selected from the broadcast station list can be reduced as compared with the conventional processing. it can.

  FIG. 13 shows a specific display example of a broadcast station list. FIG. 13 (A) is based on the conventional processing, and FIG. 13 (B) is based on the processing of this embodiment. The display list at time T1, T2, T3 is shown, and at time T2, the area where the radio wave reception environment is not good such as a tunnel or an underground parking lot (the traveling length is relatively large, for example, about 1 km) In the area where the radio wave reception environment is not good, only “BAYERN 3” can be received.

  At time T1, in the broadcast station list, the currently received program name “ARABERA” and a plurality of receivable program names are displayed. Next, at time T2, the vehicle enters an area where the reception environment is not good. In the case of the conventional processing, since the update period of the broadcast station list is long, the same broadcast station list as at time T1 is still displayed. On the other hand, in this embodiment, the reception sensitivity of the frequency in the frequency table is sequentially checked by time division, it is determined that other than “BAYERN 3” is not receivable, only “BAYERN 3” is left in the broadcast station list, All other unreceivable program names are deleted. For this reason, the user can recognize from the broadcast station list that only “BAYERN 3” can be received.

  At time T3, the user who referred to the broadcast station list of the conventional processing can no longer view “ARABERA”, so selects “HITRADO”, but “HITRADO” cannot be viewed due to poor reception sensitivity. Only noise is output from the speaker. On the other hand, the user who refers to the broadcast station list of the present embodiment can switch reception to “BAYERN 3”.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the present invention described in the claims. Deformation / change is possible.

  In the above embodiment, the electric field strength signal is used for the determination of the frequency or the reception sensitivity of the broadcasting station. It can be used as a determination condition. Further, in the above-described embodiment, the reception sensitivity determination unit 216 sets the flag “0” to the frequency determined to be unreceivable, but this is an example. For example, the reception sensitivity determination unit 216 Such a frequency may be deleted from the table. Further, in the above-described embodiment, the radio receiving apparatus that receives RDS broadcast is exemplified. However, as long as the data can be multiplexed, the radio receiver is not limited to RDS broadcast but may be other radio broadcast. Moreover, it may be not only analog radio broadcast but also digital radio broadcast such as DAB. Furthermore, in the above embodiment, a radio receiver having two tuners is illustrated, but the number of tuners is not particularly limited, and a single tuner is used in time division for receiving broadcast signals and extracting data. Alternatively, it may have three or more tuners.

10: On-vehicle electronic system 20: Radio receiver 30: Navigation device 100A, 100B: Antennas 110A, 110B: Tuner 120: Signal processing unit 130: Amplifier 132: Speaker 140: Display unit 150: Storage unit 160: Input unit 170: Interface unit 180: Control unit 200: Frequency scanning unit 202: RDS data acquisition unit 204: PI code extraction unit 206: Alternative broadcast station creation unit 208: Alternative broadcast station holding unit 210: Frequency table creation unit 212: Frequency table holding unit 214 : Broadcast station display unit 216: Reception sensitivity determination unit 218: Broadcast station deletion unit

Claims (20)

A receiving device capable of receiving a broadcast signal in which data is multiplexed,
At least first and second receiving means capable of receiving a broadcast signal;
Scanning means for scanning the frequency band by the second receiving means while outputting the broadcast signal received by the first receiving means;
Extraction means for extracting data from broadcast signals received during a period in which scanning is performed by the scanning means;
Holding means for holding a frequency table that registers receivable frequencies in the frequency band scanned by the scanning means;
Display means for displaying a broadcasting station corresponding to the frequency table held by the holding means;
Determination means for determining whether or not the frequency in the frequency table is receivable during a period in which the scanning of the frequency band is performed by the scanning means;
A deletion unit that deletes a broadcast station having a frequency determined to be unreceivable by the determination unit from the display of the broadcast station;
A receiving apparatus. The receiving apparatus according to claim 1, wherein the determination unit determines that the frequency is not receivable when all the alternative frequencies having the same program identification code as the frequency in the frequency table are not receivable. The receiving device further includes a program identification code extracting means for extracting a program identification code from the data extracted by the extracting means, and an alternative frequency table in which frequencies common to the program identification code are registered based on the extracted program identification code The receiving apparatus according to claim 2, further comprising: a creating unit configured to create, wherein the determining unit determines whether the alternative frequency is receivable with reference to the alternative frequency table. In the case where the reception sensitivity of the selected predetermined frequency in the frequency table is less than a threshold value and the reception sensitivity of the alternative frequency registered in the alternative frequency table is less than the threshold value, the determination unit The receiving apparatus according to claim 3, wherein the predetermined frequency is determined not to be receivable. The receiving apparatus according to claim 4, wherein the determination unit determines that the predetermined frequency is receivable when reception sensitivity of at least one alternative frequency in the alternative frequency table is equal to or higher than a threshold value. While the scanning unit performs scanning from the lower limit to the upper limit of the frequency band or from the upper limit to the lower limit, the determination unit determines whether or not each frequency in the frequency table is receivable by time division. The receiving device according to any one of claims 1 to 5. The determining means includes means for setting a flag in the frequency table when it is determined that a predetermined frequency is not receivable, and the deleting means is based on the set flag and displays the corresponding broadcast station The receiving device according to claim 1, wherein the receiving device is deleted. The receiving device further includes a selection unit that selects a broadcast station from a list of broadcast stations displayed by the display unit;
The receiving device according to claim 1, further comprising a control unit that controls channel selection by the first receiving unit based on the broadcasting station selected by the selecting unit. The receiving apparatus according to any one of claims 1 to 8, wherein the first and second receiving units receive an RDS broadcast. The receiving apparatus according to claim 1, wherein the first and second receiving units receive digital broadcasting. A broadcast station display method in a receiving apparatus capable of receiving a broadcast signal in which data is multiplexed,
Scanning the receivable frequency within the frequency band by the second receiving means while outputting the broadcast signal received by the first receiving means;
Extracting data from broadcast signals received during the period in which the scan is performed;
Holding a frequency table that registers receivable frequencies within the scanned frequency band;
Displaying a broadcast station corresponding to the held frequency table;
Determining whether a frequency in the frequency table is receivable during a period in which the frequency band is being scanned;
Deleting a broadcast station having a frequency determined to be unreceivable by the determining step from the display of the broadcast station;
Display method. The display method according to claim 11, wherein the determining step determines that the perimeter is not receivable when all the alternative frequencies having the same program identification code as the frequency in the frequency table are not receivable. . The display method further includes a step of extracting a program identification code from the extracted data and a step of creating an alternative frequency table in which frequencies sharing a program identification code are registered based on the extracted program identification code. The display method according to claim 11, wherein the determining step determines whether or not an alternative frequency can be received with reference to the alternative frequency table. In the determination, the reception sensitivity of the selected predetermined frequency in the frequency table is less than a threshold value, and the reception sensitivity of the alternative frequency registered in the alternative frequency table is less than the threshold value. The display method according to claim 13, wherein it is determined that the predetermined frequency is not receivable. While the scanning step performs scanning from the lower limit to the upper limit of the frequency band or from the upper limit to the lower limit, the determining step determines whether or not each frequency in the frequency table is receivable by time division. The display method according to any one of claims 11 to 14. A broadcast station display program executed by a receiving device capable of receiving a broadcast signal in which data is multiplexed,
Scanning the receivable frequency within the frequency band by the second receiving means while outputting the broadcast signal received by the first receiving means;
Extracting data from broadcast signals received during the period in which the scan is performed;
Holding a frequency table that registers receivable frequencies within the scanned frequency band;
Displaying a broadcast station corresponding to the held frequency table;
Determining whether a frequency in the frequency table is receivable during a period in which the frequency band is being scanned;
Deleting a broadcast station having a frequency determined to be unreceivable by the determining step from the display of the broadcast station;
Display program. The display program according to claim 16, wherein the determining step determines that the perimeter is not receivable when all the alternative frequencies having the same program identification code as the frequency in the frequency table are not receivable. . The display method further includes a step of extracting a program identification code from the extracted data and a step of creating an alternative frequency table in which frequencies sharing a program identification code are registered based on the extracted program identification code. The display program according to claim 16, wherein the determining step determines whether or not an alternative frequency can be received with reference to the alternative frequency table. In the determination, the reception sensitivity of the selected predetermined frequency in the frequency table is less than a threshold value, and the reception sensitivity of the alternative frequency registered in the alternative frequency table is less than the threshold value. The display program according to claim 18, wherein it is determined that the predetermined frequency is not receivable. While the scanning step performs scanning from the lower limit to the upper limit of the frequency band or from the upper limit to the lower limit, the determining step determines whether or not each frequency in the frequency table is receivable by time division. The display program according to any one of claims 16 to 19.

Images