JP2006187043A - Multiplex broadcasting receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiplex broadcasting receiver capable of updating the storage of a PI code and an AF list without discomforting a user. <P>SOLUTION: The multiplex radio receiver includes: a sound output system 10 for receiving broadcast radio waves coming from broadcast stations and including broadcast programs and data multiplexed on the broadcast programs; a data extraction system 20 for extracting the AF list of each of the broadcast radio waves for broadcasting the same program by different transmission systems and the PI code denoting the same program from the broadcast radio waves received from the sound output system 10; a RAM 32 for storing the PI code and the AF list extracted by the data extraction system 20; and a controller 36 for starting the supply of power to the sound output system 10 when detecting the absence of power supply to the sound output system 10 and updates the storage of the AF list corresponding to each of the PI codes to the RAM 32 by using the PI code and the AF list extracted by the data extraction system 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multi-broadcast receiving apparatus that receives a multi-broadcast such as a radio data system (hereinafter simply referred to as RDS) broadcast mainly used in Europe and the like.

  Conventionally, as such multiplex broadcasting, information related to program broadcasting or information such as traffic information is multiplexed on FM radio broadcasting radio waves, and the receiving side decodes the multiplexed information so that the radio broadcasting can be performed. There are RDS systems that can provide various services to listeners.

  The RDS system is widely spread mainly in Europe where many broadcasting stations often broadcast the same program through a network, and the third order of a 19 kHz stereo pilot signal other than the frequency band of the FM modulation wave. A harmonic signal of 57 kHz is used as a sub-carrier, and the sub-carrier is amplitude-modulated into a radio data signal by a data signal indicating information such as program-related information and traffic information that has been filtered and biphase-coded, and is subjected to the amplitude modulation. The subcarrier is frequency-modulated to the main carrier and broadcast.

  FIG. 16 is an explanatory diagram showing a baseband coding structure of the radio data signal.

  The radio data signal is composed of 104-bit group units as shown in FIG. 16, and each group is composed of 4 blocks of 26 bits, and each block has 16-bit information words (m0 to m15), It consists of a 10-bit check word and offset words (c′0 to c′9).

  For example, as shown in FIG. 17, a program identification code (hereinafter simply referred to as a PI code) indicating a network composed of country name data and program data is displayed in the first block, and identification data of a traffic information broadcasting station is displayed in the second block. Traffic program identification data (hereinafter simply referred to as TP data) and traffic announcement identification data (hereinafter simply referred to as TA data) indicating the identification data in the traffic information are broadcast to the third block. The data relating to the frequency of each station in the network station group, that is, the alternative frequency list (hereinafter simply referred to as AF list), is broadcast station name data (hereinafter simply referred to as PS data) such as a broadcast station name and network name in the fourth block. Respectively).

  Each group is classified into 16 types of types 0 to 15 in 4 bits according to the contents, and two versions A and B are defined for each type (0 to 15). These recognition codes are arranged in the second block. The AF list is transmitted only in the type 0A group.

  As described above, the type 0A group radio data signal includes an AF list of network stations that are broadcasting the same program as the currently receiving broadcast station, as shown in FIG.

  Now, an automatic tracking function using an AF list in a conventional multiplex broadcast receiving apparatus will be described.

  As such a multi-broadcast receiving apparatus, as disclosed in JP-A-1-202030, when receiving a radio data signal of the type 0A group, a PI code obtained by demodulation and an AF list corresponding to the PI code are provided. Captured and stored in the memory of the device, for example, when the reception level at the currently receiving broadcast station is lower than a predetermined value due to disturbance such as multipath interference, or when radio data signals cannot be received The automatic tracking operation for selecting another network station that is broadcasting the same program as the currently receiving broadcast station based on the AF list stored in the memory is started, and the reception level is improved by the automatic tracking operation. A program broadcast of the same content at another network station is received.

  Therefore, according to the conventional multiplex broadcast receiving apparatus, the user can always listen to the same program in a good reception state without being affected by disturbance.

  However, according to the conventional multiplex broadcast receiver, the storage update related to the PI code and AF list stored in the memory used for the automatic follow-up operation is performed, for example, when the set power source related to the FM mode ON is turned on. Therefore, even if the FM mode is turned on, the sound of the FM broadcast related to the update of the memory is muted, and the desired broadcast program during the update of the memory cannot be listened to. There was a point.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-broadcast receiving apparatus that can perform storage update of PI codes and AF lists without causing discomfort to the user. It is to provide.

  The present invention provides a receiving means for receiving a broadcast wave including a program broadcast and data multiplexed in the program broadcast, and a frequency for sequentially changing the reception frequency of the broadcast wave received by the receiving means. A change means, a level detection means for detecting the reception level of the broadcast radio wave at the received broadcast station, and a frequency list of each broadcast radio wave that broadcasts the same program with different transmission methods from the received broadcast radio wave, the same A program identification code indicating that it is a program, a traffic information broadcast station code indicating that it is a traffic information broadcast station that is broadcasting traffic information, and data extraction means for extracting traffic information from the traffic information broadcast station, Storage means for storing the frequency list and program identification code extracted by the data extraction means, and traffic information from the traffic information broadcasting station by the data extraction means When the traffic information interruption mode to be preferentially extracted is set and the reception level of the broadcast radio wave of the traffic information broadcast station falls below a predetermined value during this traffic information interrupt mode, the broadcast radio wave of another traffic information broadcast station And a control means for executing an auto-retune operation for sequentially receiving the broadcast radio waves of the respective broadcast stations to receive the broadcast signal, wherein the control means receives the broadcast received during the auto-retune operation. A program identification code and a frequency list are extracted from the broadcast radio wave of the station by the data extraction means, and a frequency list corresponding to each program identification code is stored and updated in the storage means based on the program identification code and the frequency list. It is characterized by that.

  The broadcast radio wave corresponds to an FM multiplex broadcast radio wave in which data is multiplexed. The level detection means detects a reception level based on a signal meter value and / or a noise level value of a broadcast radio wave.

  The data extracted by the data extraction means corresponds to RDS data, the frequency list is an AF list, the program identification code is a PI code, the traffic information broadcasting station code is TP data, and the traffic information is This corresponds to TA data.

  The traffic information interruption mode is a mode in which when TA data, that is, traffic information is received from the traffic information station, the data extraction means preferentially extracts the traffic information even if the current mode is not the FM mode. is there.

  The auto-retune operation means that when the reception level of the currently receiving traffic information broadcasting station is lower than a predetermined value during the traffic information interruption mode, that is, when the reception level deteriorates, other traffic information with good reception level. It seeks broadcast stations.

  Therefore, according to the multiplex broadcast receiving apparatus in the first aspect of the invention, the program identification code and the frequency list are extracted from the broadcast radio wave of each broadcast station received in association with the auto-retune operation, and the program identification code and the frequency are extracted. Based on the list, the frequency list corresponding to each program identification code is stored and updated in the storage means. Therefore, even if the AF list is updated during the auto-retune operation, the auto-retune operation is performed at the reception level. Therefore, the user does not feel uncomfortable by muting the FM broadcast accompanying this memory update.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the control means is configured such that the control means includes each broadcast radio wave in the frequency list corresponding to the program identification code stored in the storage means. On the other hand, the priority order is determined in the order of good reception level, and the determined priority order is stored and updated in the storage means in association with each broadcast radio wave in the frequency list.

  Therefore, according to the multiplex broadcast receiving apparatus of the second invention, in addition to the effects of the first invention, when the frequency list and the program identification code are stored and updated in the storage means, the reception level of the received frequency Since the priority order is determined in order of goodness and the determined priority order is added, the frequency list and the program identification code are stored and updated in the storage means. It is possible to swiftly and smoothly select a broadcast radio wave having a good reception level based on the priorities.

  With this configuration, the present invention extracts the program identification code and the frequency list from the broadcast radio wave of each broadcast station received in association with the auto-retune operation, and assigns each program identification code to the program identification code based on the program identification code and the frequency list. Since the corresponding frequency list is stored and updated in the storage means, even if the AF list is updated during auto-retune operation, this auto-retune operation seeks a traffic information broadcasting station with a good reception level. Therefore, the user does not feel uncomfortable by muting the FM broadcast accompanying the memory update.

  Hereinafter, an in-vehicle RDS receiver showing an embodiment of a multiplex broadcast receiver according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration inside an RDS receiver showing an embodiment of a multiplex broadcast receiving apparatus of the present invention.

  The RDS receiver shown in FIG. 1 receives an FM broadcast arriving from a broadcasting station, and outputs an audio output system 10 for outputting the received FM broadcast as audio, and data extraction for extracting data multiplexed in the FM broadcast. A system 20 and a control system 30 for controlling the entire RDS receiver are included.

  The audio output system 10 includes a receiving antenna 11 that receives a broadcast wave including a program broadcast and data multiplexed in the program broadcast, and a voltage signal from a PLL circuit (to be described later). A front end unit 12 that receives the signal from the receiving antenna 11 and converts it into a predetermined intermediate frequency signal, an IF detection circuit 13 that detects the converted intermediate frequency signal, and an output signal of the IF detection circuit 13 as a stereo signal In the case of stereo broadcasting, a multiplex (hereinafter simply referred to as MPX) circuit 14 that separates audio signals of L (left) and R (right) channels in the case of stereo broadcasting, and a stereo signal from the MPX circuit 14 A muting circuit 15 for performing mute processing, an amplifier 16 for amplifying the stereo signal, and the amplified stereo. A speaker unit 17 for audio output signal, and a PLL circuit 18 for delivering a predetermined voltage signal corresponding to the reception frequency on the basis of the control data from the control unit to be described later.

  For example, the muting circuit 15 silences the speaker unit 17 so that unpleasant sound generated during an automatic tracking operation based on the AF list or a frequency switching operation when the AF list is updated is not output from the speaker unit 17. belongs to.

  Although not shown, this RDS receiver employs a diversity antenna as the receiving antenna 11, and two radio tuners each including the front end unit 12, the IF detection circuit 13, and the PLL circuit 18 are provided. It is also possible to receive AM broadcasting with one receiving antenna 11 and receive FM broadcasting with the other receiving antenna 11.

  As the data extraction system 20, an RDS decoder 21 that decodes RDS data from the intermediate frequency signal detected by the IF detection circuit 13, and group and block synchronization are sequentially established with respect to the output data of the RDS decoder 21. In addition, an error detection / correction circuit 22 is provided for detecting an error in the output data and correcting the error detected data.

  Since the output data of the RDS decoder 21 is a 104-bit group unit composed of 4 blocks of 26 bits as shown in FIGS. 16 and 17, the error detection / correction circuit 22 For the output data from the RDS decoder 21, error detection is sequentially performed on 16-bit information words based on 10-bit offset words respectively assigned to 10-bit check words of each block.

  The control system 30 includes a reception level detection circuit 31 that detects the reception level of the intermediate frequency signal detected by the IF detection circuit 13 and, for example, AF in the RDS data extracted by the data extraction system 20. RAM 32 for storing lists, PI codes, etc .; an operation panel 35 having a display 33 for displaying various information; an operation key 34 for inputting various commands; and a control unit 36 for controlling the entire RDS receiver; have.

  The reception level detection circuit 31 monitors the detection output level of the IF detection circuit 13 to thereby detect a signal meter (hereinafter simply referred to as S meter) value which is electric field intensity data in the received signal and noise such as multipath interference. A reception level such as a level value is detected.

  The operation key 34 of the operation panel 35 includes a POWER key 34a for turning on / off the power of the RDS receiver, a volume UP key 34b and a volume DOWN key 34c for adjusting the volume, and an RDS key 34d for extracting RDS data. And a TA key 34e for activating a traffic information interruption standby (traffic information interrupt mode), a source mode switching key 34f for switching sound sources such as a tape deck and a CD player, and a preset broadcasting station are selected with one touch. There are six preset keys 34g, an auto store key 34h for automatically performing a seek operation for assigning each broadcast station to the preset key 34g, an UP key 34i and a DOWN key 34j for manually setting a desired reception frequency, and the like. is doing. It is possible to switch to the CD mode, AM mode, FM mode, tape mode, etc. by the input operation of the source mode switching key 34f.

  The control unit 36 stores the AF list, PI code extracted by the data extraction system 20, the reception level detected by the reception level detection circuit 31, and the like in the RAM 32, and from the operation key 34. The control corresponding to the operation input is executed, the voltage signal corresponding to the desired frequency is sent from the PLL circuit 18 based on the control data from the operation key 34, and the control signal is input according to the predetermined input of the operation key 34. The muting circuit 15 is ON / OFF controlled.

  The RAM 32 has N preset memory areas 32a and spare memory areas 32b corresponding to the preset keys 34g, as shown in FIG. 5, and each preset memory area 32a has each preset memory area 32a. Stores the station data related to the broadcasting station assigned to the key 34g, that is, the AF list for each PI code corresponding to the broadcasting station, and the reception level (S meter value and noise level value) at each broadcasting station in the AF list. In the spare memory area 32b, a PI code, an AF list and a reception corresponding to a broadcasting station other than the broadcasting station assigned to the preset key 34g, that is, a broadcasting station not assigned to the preset key 34g. The level (S meter value and noise level value) is stored. Each preset key 34g stores a broadcasting station for each PI code.

  Now, the operation of the RDS receiver will be described.

  First, a process of starting a RAM data update process for storing and updating the AF list and PI code extracted by the data extraction system 20 in the RAM 32 will be described. FIG. 2 is a flowchart showing the processing operation of the control unit 36 in the data update activation process.

  In FIG. 2, the control unit 36 determines whether or not the ACC power source of the vehicle on which the RDS receiver is mounted is turned off (step S <b> 11). If the ACC power is turned off, the process proceeds to a RAM data update process (step S20) shown in FIG. 3 to be described later, and after executing the RAM data update process, the data update activation process is terminated.

  If the ACC power source is not turned off in step S11, it is determined whether the power source of the in-vehicle RDS receiver is turned off (step S12). The power supply can be turned ON / OFF by monitoring the input of the POWER key 34a on the operation panel 35.

  If the power of the in-vehicle RDS receiver is turned off in step S12, the process proceeds to step S20. Further, if the power of the in-vehicle RDS receiver is not turned off in step S12, it is determined whether or not switching to a mode other than the FM mode, for example, the AM mode, the tape mode, the CD mode, or the like has been performed. (Step S13). Note that switching to a mode other than the FM mode can be realized by monitoring the input of the source mode switching key 34f on the operation panel 35.

  If switching to the other mode is performed in step S13, the process proceeds to step S20. If the mode has not been switched to the other mode, the process proceeds to step S11.

  Therefore, according to the data update activation process shown in FIG. 2, it is said that there is no FM broadcast program that the user wants to listen to when the RDS receiver is turned off, the ACC power is turned off, or the mode is switched to another mode other than the FM mode. Since the RDS data such as the AF list and PI code obtained by the data extraction system 20 is stored in the RAM 32 when the will is displayed by the key operation, it is performed immediately before listening to the desired FM broadcast as in the prior art. The user does not feel uncomfortable by the AF check operation and mute at the time of data update.

  Next, the RAM data update process in step S20 shown in FIG. 2 will be described. 3 and 4 are flowcharts showing the processing operation of the control unit 36 in the RAM data update processing.

  The RAM data update process includes the PI code of the broadcasting station assigned to the preset key 34g, the AF list corresponding to the PI code, the noise level value and S meter value of each broadcasting station in the AF list, and the RAM 32. This is a process of updating the memory.

  In FIG. 3, the control unit 36 sets the preset No. in the preset memory area 32a corresponding to the preset key 34g of “1”. Is set to “1” (step S21), the reception frequency is set to the minimum reception frequency within the reception band of the FM radio broadcast (step S22), and there is a station detection signal of the broadcast station corresponding to the set reception frequency. It is determined whether or not (step S23).

  If there is the station detection signal, the reception level of the broadcasting station is acquired via the reception level detection circuit 31 (step S24), and whether or not the acquired reception level is a reception level at which RDS data can be read. Determination is made (step S25).

  If the acquired reception level is a reception level at which RDS data can be read, it is determined whether or not the same PI code as the broadcast station of the currently received reception frequency is in the preset memory area 32a (step S26). . If there is no identical PI code in the preset memory area 32a, it is determined that the same program is not stored in duplicate in the preset memory area 32a. It is determined whether or not N value has been exceeded (step S27). The N value corresponds to the number of preset keys 34g. In this embodiment, the number of preset keys 34g is six, that is, six broadcasting stations. It turns out that.

  The preset No. If the value does not exceed the N value, it is determined that the same program is not stored in duplicate in the preset memory area 32a, and as shown in FIG. The station data of the broadcasting station is stored (step S28). The station data corresponds to a PI code, an AF list corresponding to the PI code, and a reception level at each broadcasting station in the AF list.

  After the station data is stored in the empty preset memory area 32a in step S28, the preset No. Is incremented by 1 (step S29), the reception frequency is increased by one step (step S30), and it is determined whether or not the reception band of the FM broadcast has been made (step S31). If the reception band is made a round, the process proceeds to M1 shown in FIG. If the reception band has not been made, the process proceeds to step S23.

  If there is no station detection signal in step S23 or if the reception level is not such that RDS data can be read in step S25, the process proceeds to step S30.

  In step S27, the preset No. If the value exceeds the N value, it is determined that there is no empty preset memory area 32a in the RAM 32, the station data is stored in the spare memory area 32b of the RAM 32 (step S33), and the process proceeds to step S30.

  If the same PI code exists in the preset memory area 32a in step S26, the station data is stored and updated in the preset memory area 32a having the same PI code (step S32), and the process proceeds to step S30.

  In M1 shown in FIG. 4, the control unit 36 determines the priority order No. in descending order of the S meter value in the AF list for each PI code in the station data stored in each preset memory area 32a. (Step S41), the one having the same S meter value in the AF list is given priority to the lower noise level value (step S42), and the S meter value and the noise level value in the AF list are given priority. Are the same, priority is given to give priority to the one with the lower reception frequency (step S43), and the RAM data update processing is terminated.

  The processing operations of steps S41, S42, and S43 are based on the order of increasing S meter value corresponding to each broadcasting station in the AF list in the same PI code as the first priority condition, and in the case of the same S meter value, the noise level The lower priority order is the second priority condition, and in the case of the same S meter value and the same noise level value, the priority order No. Is given.

  Therefore, according to the RAM data update processing shown in FIGS. 3 and 4, when the station data of each broadcasting station is stored in the RAM 32, the reception level of each broadcasting station in the AF list of the station data is checked. Since the priorities are matched and stored in the order of good reception levels based on the checked reception levels, the same program broadcasts with good reception levels based on the priorities in the automatic tracking operation described later. Can be received quickly and smoothly.

  Also, according to the RAM data update process shown in FIGS. 3 and 4, for example, the traffic information interruption such as TA data is executed during other modes other than the FM mode, that is, the data extraction system during other modes. It is also assumed that 20 must be activated. Therefore, the RAM data update process in such a case will be described. FIG. 6 is a flowchart showing the processing operation of the control unit 36 in the RAM data update processing. In the flowchart of FIG. 6, a case where the mode is switched to a mode other than the FM mode, for example, the tape mode will be described.

  In FIG. 6, the control unit 36 determines whether or not the mode has been switched from the FM mode to another mode other than the FM mode, for example, the tape mode (step S71). If the mode has been switched to another mode, it is determined whether or not the TA is waiting due to traffic information interruption (step S72). If not in the TA waiting state, a preset frequency, for example, the last memory frequency is received (step S73), and it is determined whether or not the received S meter value of the broadcast station is equal to or greater than a predetermined value (step S73). S74).

  If the S meter value is equal to or greater than a predetermined value, the station data of the receiving station, that is, the PI code of the receiving station, the AF list corresponding to the PI code, and the reception level related to each broadcasting station in the AF list, The data is stored in the preset memory area 32a corresponding to the receiving station (step S75), and the priority order No. is determined based on the reception level in the station data. Is updated (step S76), and it is determined whether or not the reception band of the FM broadcast has been made once (step S77).

  If the reception band of the FM broadcast has been made once, the timer is cleared (step S78), and it is determined whether or not the set time has elapsed (step S79). If the set time has elapsed, it is determined whether or not the FM mode has been switched (step S80). If the mode has been switched to the FM mode, the RAM data update process is terminated.

  It should be noted that the necessity of step S78 and step S79 is as follows. If the data is updated only once when switching from the FM mode to another mode, the vehicle equipped with the RDS receiver moves immediately. Since the data contents change, the provision of a timer is intended to update the data about once every 10 minutes to greatly reduce the burden on the control unit 36 related to the data update.

  If the mode is not switched to a mode other than the FM mode in step S71, the RAM data update process is terminated. If TA is waiting in step S72, the process proceeds to step S80. If the electric field strength of the receiving station is not greater than or equal to the predetermined value in step S74, the process proceeds to step S77.

  If the reception band of the FM broadcast is not made one round in step S77, the reception frequency is updated by one step to the next reception frequency (step S81), and the process proceeds to step S74.

  If the FM mode has not been switched in step S80, the process proceeds to step S72.

  Therefore, according to the RAM data update process shown in FIG. 6, even if the mode is switched to a mode other than the FM mode, when the traffic information is on standby, that is, when the data extraction system 20 is operating. Since the RAM data update process is not executed, the same effect as the RAM data update process shown in FIGS. 3 and 4 can be obtained without obstructing the traffic information interruption operation using the RDS data.

  The RDS receiver has an auto store function. As the auto store function, it is often used when a new receiver is purchased or when the reception area is greatly moved, and if the RAM data update process is performed at this time, further improvement will be made. There is no doubt that it will be effective. Therefore, a RAM data update process performed during such an auto store operation will be described. 7 and 8 are flowcharts showing the processing operation of the control unit 36 in the auto store RAM data update process.

  The control unit 36 shown in FIG. 7 determines whether or not the auto store key 34h has been input (step S121). If the auto store key 34h is input, the preset No. corresponding to the assigned preset key 34g. Is set to “1” (step S122), the reception frequency to be sought is set and received (step S123), and the reception level of the received receiving station is detected via the reception level detection circuit 31 (step S123). In step S124, it is determined whether or not the detected reception level is a reception level at which RDS data can be read (step S125). If the reception level is readable, the RDS data is read (step S126), and the preset No. corresponding to the preset key 34g is read. It is determined whether or not “6” exceeds “6” (step S127).

  The preset No. corresponding to the preset key 34g. If “6” is not exceeded, the current preset No. Is stored in the preset memory area 32a corresponding to the received broadcast station (step S128). Is incremented by 1 (step S129), and the process proceeds to M4 shown in FIG.

  If the auto store key 34h is not input in step S121, the auto store RAM data update process is terminated. If the reception level of the receiving station is not a level at which RDS data can be read in step S125, it is determined whether or not the same frequency as the receiving station exists in the AF list in the preset memory area 32a (step S130). ).

  If there is the same frequency as the receiving station in the AF list, the reception level of the corresponding frequency in the AF list is rewritten to the reception level acquired in step S124 (step S131), and the reception frequency is incremented by one step ( In step S132, it is determined whether or not the FM broadcast reception band has been made one round by the seek up (step S133). If the reception band has been made one round, the auto store RAM data update process is terminated.

  In step S127, the preset No. If it exceeds “6”, the process proceeds to M4 shown in FIG.

  If the same frequency as the receiving station is not present in the AF list in step S130, the process proceeds to step S132. If it is determined in step S133 that the reception band of the FM broadcast has not been made once, the process proceeds to step S123.

  Next, in M4 shown in FIG. 8, the control unit 36 determines whether or not the same frequency as that of the receiving station currently being received exists in the AF list of the preset memory area 32a of the RAM 32 (step S141). If there is the same frequency as the receiving station in the AF list, it is determined whether the PI code corresponding to the AF list is the same as the PI code of the receiving station (step S142). If these PI codes are the same, the process proceeds to M6 shown in FIG.

  If the PI codes are not the same in step S142, as shown in FIG. 9, an “x” mark is added to indicate that a different frequency broadcasting station in the AF list is broadcasting a different program (step S142). S143), the process proceeds to M5 shown in FIG. In step S143, as shown in FIG. 9, the corresponding frequency is marked with an "x" mark to identify that it is not the same program, but the reception level is not rewritten.

  If there is not the same frequency as the receiving station in the AF list in step S141, the AF list of the new PI code, that is, the station data of the receiving station is stored in the empty preset memory area 32a (step S144), and FIG. The process proceeds to M5 shown. In step S144, the station data of the receiving station is stored in the empty preset memory area 32a. If there is no empty preset memory area 32a, the station data is stored in the spare memory area 32b.

  Therefore, according to the auto store RAM data update process shown in FIG. 7 and FIG. 8, the AF list corresponding to each PI code and the AF list in the auto store function used at the time of new use and when moving to a new reception area are included in the AF list. Since the reception level of each broadcasting station is stored in the RAM 32, the usability is very good. In the auto store RAM data update processing, the priority order in the AF list stored in the RAM 32 may be given, and in this case, the priority order is as shown in FIG.

  In addition, according to the auto store RAM data update process, it differs at the same frequency as one in the AF list transmitted as RDS data due to inadequate broadcasting station or broadcasting administration or regional / terrain problems such as borders. If there is a broadcasting station that is broadcasting a program, the conventional broadcasting station that broadcasts the different program is received once during the automatic follow-up operation. It will be judged. However, as shown in step S143, when there is a broadcast station of a different program in the AF list stored in the RAM 32, a different program broadcast at the time of the automatic follow-up can be performed by adding an “x” mark. There is no such thing as receiving a station.

  Further, according to the auto store RAM data update process, a station that is actually performing RDS broadcasting due to inadequate broadcasting station side or broadcasting administration, but is not incorporated in the AF list transmitted as the RDS data. In the conventional automatic tracking operation, it is impossible to automatically track a broadcasting station that has not been incorporated, but a new PI code AF list is created as shown in step S144. Since the station data is stored, the broadcasting station that has not been incorporated can be recognized even if it is not incorporated into the AF list.

  Next, an automatic tracking operation based on the station data stored in the RAM 32 will be described. FIG. 10 is a flowchart showing the processing operation of the control unit 36 in the first automatic follow-up operation process.

  The first automatic follow-up operation process is a reception level based on the priority order in each broadcasting station for each identical program obtained from the RAM data update process shown in FIG. 3, FIG. 4, FIG. 6, FIG. This is a process of receiving the same same program broadcast.

  In FIG. 10, the control unit 36 determines whether or not the S meter value at the currently receiving broadcast station is equal to or less than a predetermined value (step S51). If the S meter value at the currently receiving broadcast station is less than or equal to the predetermined value, the reception frequency and reception level at the receiving station are stored in the RAM 32 (step S52), and a preset memory area relating to the receiving station is stored. Based on the priority stored in 32a, the highest priority broadcasting station is set (step S53), the muting circuit 15 is muted (step S54), and the previously set priority broadcasting station is selected. Reception is performed (step S55), and it is determined via the reception level detection circuit 31 whether or not the S meter value of the receiving station is equal to or greater than a predetermined value and the noise level value is equal to or smaller than a predetermined value (step S56).

  If the S meter value of the receiving station is equal to or greater than a predetermined value and the noise level value is equal to or smaller than the predetermined value, the audio muting of the muting circuit 15 is canceled (step S57), and the first automatic follow-up operation process is terminated. To do.

  In step S56, if the S meter value of the receiving station is not less than the predetermined value and the noise level value is not less than the predetermined value, the priority No. +1 is incremented and set (step S58), and the priority No. in the preset memory area 32a related to the receiving station is set. Is the maximum value, that is, priority No. The last No. It is determined whether or not (step S59). The priority order No. The determination whether or not is the maximum value corresponds to the number of broadcasting stations in the AF list stored in the preset memory area 32a.

  In step S59, the priority No. Is the maximum value, the priority No. 1, that is, the highest priority broadcasting station is set (step S60), and the receiving station receives the receiving frequency before muting, that is, the receiving station received in step S51 (step S61). The mute is canceled (step S62), and it is determined whether or not the S meter value of the receiving station is equal to or less than a predetermined value (step S63). If the S meter value is not less than or equal to the predetermined value, the first automatic follow-up operation process is terminated.

  In step S59, the priority No. If is not the maximum value, the process proceeds to step S61. If the S meter value is equal to or smaller than the predetermined value in step S63, a timer is started (step S64), and it is determined whether or not a predetermined time of the started timer has elapsed (step S65). If the predetermined time has elapsed, the process proceeds to M2 in the figure. Note that the processing operations of step S61 and step S62 are performed in order to avoid discomfort given to the user by mute for a long time. Further, the processing operations of Step S64 and Step S65 are for monitoring that the reception level is improved by increasing the time interval.

  Therefore, according to the first automatic follow-up operation process shown in FIG. 10, each same program stored in each preset memory area 32a by the RAM data update process shown in FIG. 3, FIG. 4, FIG. 6, FIG. Since the automatic follow-up operation is executed based on the priority of the broadcast station, it is possible to receive a broadcast station with a good reception level quickly and smoothly, and it is possible to receive a broadcast station with a good reception level. User discomfort due to time mute can be largely avoided.

  In the first automatic tracking operation process, since the vehicle equipped with the RDS receiver is moving, the actual reception level during the tracking operation and the reception level based on the priority order stored in the preset memory area 32a. It is also possible that a slight deviation occurs.

  Therefore, in order to overcome such a situation, a second automatic follow-up operation process shown in FIG. 11 can be considered. FIG. 11 is a flowchart showing the processing operation of the control unit 36 in the second automatic follow-up operation process.

  According to the second automatic tracking operation process, a broadcast station having a good reception level is always received while updating the priority order stored in the preset memory area 32a even during the automatic tracking operation.

  In FIG. 11, the control unit 36 determines whether or not the S meter value of the currently receiving broadcast station is equal to or less than a predetermined value (step S91). If the S meter value is less than or equal to the predetermined value, the frequency and reception level of the receiving station are stored in the RAM 32 (step S92), and the priority order No. is read from the preset memory area 32a corresponding to the currently receiving broadcasting station. 1 is set (step S93), the audio muting is performed in the muting circuit 15 (step S94), and the set priority No. 1 is set. (Step S95), it is determined whether or not the S meter value of the receiving station is equal to or greater than a predetermined value and the noise level value is equal to or smaller than a predetermined value (step S96).

  If the S meter value of the receiving station is equal to or greater than a predetermined value and the noise level value is equal to or smaller than the predetermined value, the currently received reception level is stored and updated (step S97), and the priority order update process shown in FIG. (Step S110), after the priority update process, the muting circuit 15 cancels the audio mute (step S98), and ends the second automatic tracking operation.

  If the S meter value of the receiving station is not less than the predetermined value and the noise level value is not less than the predetermined value in step S96, the reception level of the current receiving station is stored and updated (step S99), and the current receiving station is supported. Priority No. of preset memory area 32a. Is set to +1 increment (step S100). It is determined whether or not the maximum value has been reached (step S101).

  The priority No. If the maximum value is reached, the process proceeds to the priority order update process shown in FIG. 9 (step S110). 1 is set (step S102), the broadcast station that has received the current reception frequency in step S91 is received (step S103), and the audio mute of the muting circuit 15 is released (step S104). Then, it is determined whether or not the S meter value of the receiving station is equal to or less than a predetermined value (step S105). If the S meter value of the receiving station is equal to or smaller than a predetermined value, a timer is started (step S106), and it is determined whether or not a predetermined time has elapsed (step S107). If the predetermined time has elapsed, the process proceeds to M3 in the figure.

  In step S101, the priority order No. If is not the maximum value, the process proceeds to step S103.

  Next, the priority update process in step S110 will be described. FIG. 12 is a flowchart showing the processing operation of the control unit 36 in the priority order update process.

  In FIG. 12, the control unit 36 assigns priorities to the broadcasting stations in the AF list of the preset memory area 32a corresponding to the currently following PI code in descending order of the S meter value (step S111). When there is the same S meter value sometimes, priority is given to the one with the lower noise level value (step S112), and when the S meter value is the same and the noise level value is the same, the priority is given in ascending order of the reception frequency ( Step S113), the priority order update process ends.

  Therefore, according to the second automatic tracking operation process shown in FIG. 11, since the latest priority is updated while performing the automatic tracking operation, the user can always receive a broadcasting station with a good reception level. .

  FIG. 13 is a flowchart showing the processing operation of the control unit 36 in the priority order update processing according to another embodiment of the present invention. Since the configuration is substantially the same as that of the above-described embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

  Usually, in such an in-vehicle RDS receiver, a TP station that transmits this TA data during traffic information interruption standby in other modes other than FM mode (in traffic information interruption mode; TA standby) When the reception level is lower than a predetermined value, that is, when the reception status of the TP station deteriorates, a TP auto-retune operation for searching for a TP station with a good reception status is executed. In the traffic information interruption mode, when TA data is received from the TP station, the TA data is preferentially decoded even if the current mode is not the FM mode.

  The priority update process shown in FIG. 13 is to measure the reception level (S meter value and noise level value) of each broadcasting station received along with the TP auto-retune operation even when waiting for traffic information interruption. Based on this reception level, the priority order in the AF list stored in the preset memory area 32a is stored and updated in the order of good reception level.

  The control unit 36 shown in FIG. 13 determines whether the TA is on standby (step S161). If the TA is waiting, it is determined whether or not the S meter value of the receiving station that is currently receiving is equal to or greater than a predetermined value (step S162). If the S meter value of this receiving station is greater than or equal to a predetermined value, it is determined whether or not the noise level value of this receiving station is less than or equal to a predetermined value (step S163). If the noise level value of this receiving station is equal to or less than a predetermined value, it is determined whether or not this receiving station is a TP station (step S164).

  If this receiving station is a TP station, it is determined whether TA data is being received (step S165). If TA data is being received, a TA interrupt operation is executed (step S166), and this priority update process is terminated.

  If TA data is not being received in step S165, the process proceeds to step S161. If not waiting for TA in step S161, the process proceeds to M7 in the figure.

  Further, the S meter of the receiving station is not greater than or equal to a predetermined value in step S162, or the noise level value of the receiving station is not less than or equal to the predetermined value in step S163, or the receiving station must be a TP station in step S164. For example, the TP auto-retune operation is started (step S167), the reception frequency is updated and set by one step in order to search for another TP station (step S168), and the S meter value of the set reception station is predetermined. It is determined whether or not the value is greater than or equal to the value (step S169).

  If the S meter value of this receiving station is not less than a predetermined value, it is determined whether or not the noise level value of this receiving station is not more than a predetermined value (step S170). If the noise level value of this receiving station is not more than a predetermined value, it is determined whether or not this receiving station is a TP station (step S171). If this receiving station is a TP station, the reception frequency of the current receiving station is stored in the RAM 32 (step S172), and it is determined whether TA data is being received (step S173). If TA data is being received, the process proceeds to step S166.

  If the S meter value of the receiving station is not greater than or equal to the predetermined value in step S169, or the noise level value of the receiving station is not less than the predetermined value in step S170, or the receiving station is a TP station in step S171. If not, or if TA data is not being received, the process proceeds to M8 shown in FIG.

  In M8 shown in FIG. 14, the control unit 36 determines whether or not the AF list stored in the preset memory area 32a has the same frequency as the reception frequency of the receiving station set in step S168 shown in FIG. Is determined (step S181).

  If the same frequency exists in the preset memory area 32a, the priority order of the preset memory area 32a is updated based on the reception level composed of the S meter value in step S169 and the noise level value in step S170 shown in FIG. (Step S182), it is determined whether or not the reception frequency set in Step S168 shown in FIG. 13 has made one round within the FM reception broadcast band, that is, whether or not seek has been completed in all broadcast stations within the FM reception broadcast band. (Step S183).

  If the FM reception broadcast band is made one round, it is determined whether or not there is a reception frequency of the TP station in the RAM 32, that is, whether or not there is a reception frequency stored in step S172 shown in FIG. (Step S184). If there is a reception frequency of the TP station in the RAM 32, this reception frequency is set (step S185), and the process proceeds to M9 shown in FIG.

  If the same frequency is not present in the preset memory area 32a in step S181, the process proceeds to step S183. If it has not made one round in the FM reception broadcast band in step S183, it moves to M10 shown in FIG.

  If the reception frequency of the TP station is not stored in the RAM 32 in step S184, the reception frequency of the TP station received in step S162 shown in FIG. 13 is set (step S186), and the process proceeds to M9 shown in FIG. To do.

  As described above, according to the priority order update process shown in FIGS. 13 and 14, the reception level (S meter value and noise level value) of each broadcasting station received with the TP auto-retune operation is measured, and this measurement is performed. Based on the result, the priority order of each broadcasting station in the AF list stored in the preset memory area 32a is stored and updated.

  Thus, as a user, the original purpose of the TP auto-retune operation is to seek a TP station having a good reception level. During this TP auto-retune operation, the memory update is executed and the FM broadcast accompanying this memory update is performed. There is no discomfort from muting.

  Even during TA standby, the priority order in the AF list can be stored and updated during the TP auto-retune operation. In addition, at the time of the automatic tracking operation, the broadcasting station with the best reception level can be received quickly and smoothly based on the priority order in the AF list stored in the preset memory area 32a.

  FIG. 15 is a flowchart showing the processing operation of the control unit 36 in the priority order update processing of another embodiment. Since the configuration is substantially the same as that of the above-described embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

  In general, in-vehicle RDS receivers employ diversity antennas as receiving antennas 11, and therefore have radio tuner units corresponding to the respective receiving antennas 11. For example, one radio tuner unit receives AM broadcasts. Even in this case, the other radio tuner unit can receive FM broadcast. The radio tuner section referred to here corresponds to the front end section 12, the IF detection circuit 13, and the PLL circuit 18.

  In such an RDS receiver, even in a mode other than the FM mode, for example, in the AM mode, the CD mode or the tape mode, an FM broadcast is received by one of the radio tuner units, and in the FM mode. The S meter value and RDS data acquisition of the broadcast station received last are monitored, and when the reception level of this broadcast station deteriorates, an automatic follow-up operation is performed so as to receive a broadcast station with a good reception level.

  The priority order update process shown in FIG. 15 is performed after the automatic follow-up operation is performed during a mode other than the FM mode, and then the reception levels (S meter value and noise) of all broadcast stations in the FM broadcast reception band. Level value) is measured, and the priority order of each broadcasting station in the AF list stored in the preset memory area 32a is stored and updated based on the measurement result.

  In FIG. 15, the control unit 36 determines whether or not to start the automatic follow-up operation (step S191). If this automatic follow-up operation is to be started, this automatic follow-up operation is executed (step S192), and it is determined whether or not this automatic follow-up operation has ended (step S193). The determination of the start of the automatic follow-up operation in step S191 is based on whether or not the reception level at the receiving FM broadcast station has decreased below a predetermined value.

  If the automatic follow-up operation is completed in step S193, it is determined whether or not the current mode is a mode other than the FM mode (step S194). If the current mode is a mode other than the FM mode, the reception frequency is updated and set by one step (step S195), and whether the set S meter value of the receiving station currently receiving is equal to or greater than a predetermined value. It is determined whether or not (step S196).

  If the S meter value of this receiving station is greater than or equal to a predetermined value, it is determined whether or not the noise level value of this receiving station is less than or equal to a predetermined value (step S197). If the noise level value of this receiving station is less than or equal to a predetermined value, it is determined whether or not RDS data can be acquired at this receiving station (step S198).

  If the RDS data can be obtained at this receiving station, it is determined whether or not the same frequency as the receiving frequency of this receiving station exists in the AF list stored in the preset memory area 32a (step S199). .

  If the same frequency exists in the preset memory area 32a, the priority order of the preset memory area 32a is updated based on the reception level based on the S meter value in step S196 and the noise level value in step S197 (step S200). Then, it is determined whether or not the reception frequency set in step S196 has made one round in the FM reception broadcast band, that is, whether or not the seek for all broadcast stations in the FM reception broadcast band has been completed (step S201). If the FM reception broadcast band has been made once, the processing operation of this priority update processing is terminated.

  If the automatic follow-up operation has not been started in step S191, the processing operation of this priority update process is terminated. If the current mode is not a mode other than the FM mode in step S194, the process proceeds to step S191.

  If the S meter value of the receiving station is not greater than or equal to a predetermined value in step S196, or if the noise level value of the receiving station is not less than or equal to the predetermined value in step S197, or RDS data in the receiving station in step S198 If it has not been acquired, the process proceeds to step S199.

  If there is not the same frequency as the reception frequency of the receiving station in the AF list of the preset memory area 32a in step S199, the process proceeds to step S201.

  As described above, according to the priority order update process shown in FIG. 15, after the automatic follow-up operation in the mode other than the FM mode, the reception levels (S meter value and noise level value) of all the broadcast stations in the FM reception broadcast band are obtained. ) And the priority order of each broadcasting station in the AF list stored in the preset memory area 32a is stored and updated based on the measurement result.

  Thus, even if the user performs an automatic tracking operation in a mode other than the FM mode, the purpose is to not interrupt the current mode, that is, the other mode other than the FM mode. Even if the memory update in the AF list is performed after the automatic follow-up operation is performed, the FM broadcast is not listened to, and therefore, the FM broadcast is not uncomfortable due to the mute of the FM broadcast.

  In addition, after execution of the automatic follow-up operation in a mode other than the FM mode, the priority order in the AF list can be stored and updated. In addition, at the time of a new automatic follow-up operation, the broadcasting station with the best reception level can be received promptly and smoothly based on the priority order in the AF list stored in the preset memory area 32a.

  In addition, when the reception status for FM broadcasting deteriorates in modes other than the FM mode, there is a high possibility that the user is out of the area of the traffic information that the user is trying to obtain even when waiting for TA. Therefore, even if the user cannot obtain traffic information while updating the priority order in the AF list, the user will not be disturbed.

  In the priority order update process shown in FIG. 15, the AF list storage update in the RAM 32 is executed after the automatic follow-up operation is executed in a mode other than the FM mode. The AF list may be updated at any time as long as it is in a mode other than the FM mode.

  The present invention extracts a program identification code and a frequency list from broadcast radio waves of each broadcasting station received in association with the auto-retune operation, and based on these program identification code and frequency list, a frequency list corresponding to each program identification code Is updated in the storage means, so that even if the AF list is updated during the auto-retune operation, the auto-retune operation is intended to seek a traffic information broadcasting station with a good reception level. Therefore, muting of FM broadcasts associated with this memory update does not cause discomfort to the user. Multiplexing for receiving multiple broadcasts such as radio data system broadcasts mainly used in Europe etc. It is suitable for a broadcast receiving apparatus or the like.

It is a block diagram which shows schematic structure inside the RDS receiver which shows embodiment of the receiver for multiplex broadcasting of this invention. It is a flowchart which shows the processing operation of the control part in the data update starting process of this embodiment. It is a flowchart which shows the processing operation of the control part in the RAM data update process of this embodiment. It is a flowchart which shows the processing operation of the control part in the RAM data update process of this embodiment. It is explanatory drawing which shows the memory map inside RAM of this embodiment. It is a flowchart which shows the processing operation of the control part in the RAM data update process of this embodiment. It is a flowchart which shows the processing operation of the control part in the auto store RAM data update process of this embodiment. It is a flowchart which shows the processing operation of the control part in the auto store RAM data update process of this embodiment. It is explanatory drawing which shows the memory map inside RAM in the said auto store RAM data update process. It is a flowchart which shows the processing operation of the control part in the 1st automatic tracking operation | movement process of this embodiment. It is a flowchart which shows the processing operation of the control part in the 2nd automatic tracking operation | movement process of this embodiment. It is a flowchart which shows the processing operation of the control part in the priority order update process of this embodiment. It is a flowchart which shows the processing operation of the control part in the priority update process of other embodiment. It is a flowchart which shows the processing operation of the control part in the priority update process of other embodiment. It is a flowchart which shows the processing operation of the control part in the priority update process of other embodiment. It is explanatory drawing which shows the baseband coding structure of a radio data signal. It is explanatory drawing which shows the format structure of a type 0A group.

Explanation of symbols

10 Audio output system (reception means)
20 Data extraction system (data extraction means)
31 Reception level detection circuit (level detection means)
32 RAM (storage means)
32a Preset memory area 32b Spare memory area 36 Control unit (power supply determination means, control means, interrupt standby determination means, first determination means, first
(2 determination means, frequency change means, mode setting determination means)

Claims (2)

Receiving means for receiving a broadcast wave including a program broadcast and data multiplexed in the program broadcast coming from a broadcast station;
Frequency changing means for sequentially changing the reception frequency of the broadcast radio wave received by the receiving means;
Level detection means for detecting the reception level of the broadcast radio wave at the received broadcast station;
It is a traffic information broadcasting station that broadcasts frequency lists of broadcast radio waves that broadcast the same program with different transmission methods from received broadcast radio waves, a program identification code that indicates the same program, and traffic information A data extraction means for extracting the traffic information broadcast station code and traffic information from the traffic information broadcast station,
Storage means for storing the frequency list and program identification code extracted by the data extraction means;
A traffic information interruption mode for preferentially extracting traffic information from the traffic information broadcasting station by the data extraction means is set, and the reception level of the broadcast information of the traffic information broadcasting station is predetermined during the traffic information interruption mode. A receiver for multiplex broadcasting having a control means for performing an auto-retune operation for sequentially receiving the broadcast radio waves of each broadcast station in order to receive the broadcast radio waves of other traffic information broadcast stations when lower than the value,
The control means extracts the program identification code and the frequency list by the data extraction means from the broadcast wave of the broadcasting station received during the auto-retune operation, and each program is based on the program identification code and the frequency list. A receiving apparatus for multiplex broadcasting, wherein a frequency list corresponding to an identification code is stored and updated in the storage means. The control means determines priority for each broadcast radio wave in the frequency list corresponding to the program identification code stored in the storage means in order of good reception level, and determines the determined priority order as the frequency. 2. The multi-broadcast receiving apparatus according to claim 1, wherein the storage unit updates the storage in association with each broadcast radio wave in the list.

Images