JPH08316860A - On-vehicle fm multiplex broadcast receiver - Google Patents

Abstract

PURPOSE: To obtain the on-vehicle FM multiplex broadcast receiver in which a paging signal addressed to itself is received without-missing while preventing consumption of a battery when the vehicle is not in use. CONSTITUTION: The receiver is provided with an FM multiplex broadcast reception section 1 receiving an FM multiplex broadcast signal, a paging signal selection section 3 selecting a paging signal in the FM multiplex broadcast signal, an audio signal reproduction section 2 reproducing an audio signal in the FM multiplex broadcast signal, a paging data memory 5 storing paging data, a display section 6 displaying the paging data, and a control section controlling the operation. Then the capacitor 4 switches the FM multiplex broadcast reception section 1, the paging signal selection section 3, and the paging data memory 5 into the operating state only for a timing period when a paging signal addressed to itself is received when a power supply of the on-vehicle FM multiplex broadcast receiver is inactive in the case of turning off an accessory key. The received paging data and the reception time data are stored in the paging memory 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted FM multiplex broadcast receiver, and more particularly to an FM multiplex broadcast receiver and a paging signal selector which are addressed to themselves when an accessory key of a vehicle is turned off. The present invention relates to an on-vehicle FM multiplex broadcast receiver that switches the FM multiplex broadcast receiving unit and the paging signal selection unit to the operating state only during the reception timing period of the paging signal and receives and stores the paging signal addressed to itself.

[0002]

2. Description of the Related Art Conventionally, paging systems are, for example,
It is used in fields such as pagers, and this system uses a dedicated frequency signal for transmitting a paging signal and a dedicated receiver for receiving the paging signal.

Also, recently, on the transmitting station side,
An FM multiplex broadcast signal in which a DARC (data radio channel) system paging signal is FM-multiplexed is transmitted to the FM broadcast signal, and a paging signal receiver is newly provided in the FM multiplex broadcast receiver on the receiving side for reception. There is an attempt to make it possible to transmit more paging data than the known paging system by displaying the paging signal on the display unit, and an experimental test broadcast has already been performed on this attempt.

In this case, the DARC system paging system provisional standard used for such experimental test broadcasting is
The outline consists of the following methods.

This DARC paging system is
It has a hierarchical structure including a layer 1 (transmission path), a layer 2 (error correction), a layer 3 (data packet), a layer 4 (data group), a layer 5 (segment), and a layer 6 (segment data).

FIG. 2A shows the layer 1 (transmission path) of the DARC paging system, and FIG. 2B shows DA.
The layer 2 (error correction) of the RC paging system is shown. The structures of layer 1 (transmission line) and layer 2 (error correction) are the layers 1 (transmission line) and layer 2 in the known FM multiplex character broadcasting system. It has the same structure as (error correction).

Next, FIGS. 3A to 3D show DARC.
3A and 3B show a layer 3 (data packet) of the method paging system. FIG. 3A shows a normal data packet structure, and FIG. 3B shows a data packet prefix structure shown in FIG. 3A. FIG. 3C shows the structure of a data packet with the packet number expanded, and FIG.
FIG. 3D shows the structure of the prefix of the data packet shown in FIG. 3 (a) to 3 (d), b1, b2, ..., B16 represent bit numbers.

As shown in FIG. 3A, the structure of a normal data packet has a 16-bit block identification (BIC) first, then a 16-bit prefix, and then a 160-bit prefix. There is paging data, followed by a 14-bit error detection code (CRC), and finally an 82-bit parity code. In addition, as shown in FIG. 3B, the 16-bit prefix structure is initially 4 bits (b1 to b1).
4) There is a service identification, and then 1 bit (b5)
Decoding identification flag, followed by a 1-bit (b6) information end flag, followed by a 2-bit update flag, followed by a 4-bit (b9 to b12) data group number, and finally 4 bits (b13 to b1)
There is a data packet number of 6). On the other hand, as shown in FIG. 3C, the configuration of the data packet in which the packet number is expanded has a bit number that constitutes the prefix when compared with the configuration of the normal data packet shown in FIG. The number of bits constituting the paging data is changed from 16 bits to 24 bits, and the number of bits forming the paging data is changed from 160 bits to 152 bits. In addition, as shown in FIG. 3D, the 24-bit prefix configuration has 8 bits (b17) when compared to the 16-bit prefix configuration shown in FIG. 3B.
To b24) are added.

Next, FIGS. 4A to 4C show DAR.
Tier 4 of C-system paging system (data group)
4A shows the positional relationship of data blocks in a data packet, FIG. 4B shows the structure of a data block having a large segment, and FIG. 4C shows a data block having a small segment. It shows a configuration. In this case, the data group is composed of one or a plurality of data blocks, and is also composed of one or a plurality of information units called segments. When the paging data in the data group is calling data, one segment is usually several tens of bytes in size, but when the paging data is scramble information or common information, one segment is usually several bytes in size. is there.

As shown in FIG. 4A, the data block corresponds to the paging data in FIGS. 3A and 3C and is composed of 160-bit or 152-bit data. In addition, as shown in FIG. 4B, when the segment is large and the data group is composed of one segment (the data block is composed of a plurality of segments), or FIG. As shown in, even if the segment is small and the data group is composed of multiple segments (also the data block is composed of multiple segments), the final segment and the error detection code ( A null code (NUL) is embedded between the CRC and the CRC.

Next, FIGS. 5A to 5C and FIG.
5A and 5B show the layer 5 (segment) of the DARC paging system. FIG. 5A shows the structure of the segment and FIG. 5B shows the structure of the segment header. (C) is the content of segment identification,
FIG. 5D shows the structure of the segment length.

As shown in FIG. 5 (a), one segment is composed of a segment header of 1 to 4 bytes and a segment data of 1 or more bytes following it. As shown, the segment header consists of a 4-bit segment identification that defines the contents of the segment data, and a segment length that defines the length of the segment data that follows. In this case,
As shown in (c), the segment identification has contents such as D (call data), A (alternative frequency information), 1 (scramble information), 9 (common information), and 7 (transmission cycle). Has been done. Further, as shown in FIG. 5 (d), the segment length is shown to be composed of a 4-bit segment length, a 1-byte extended segment length 1 that follows, and a 2-byte extended segment length 2 after that. However, for a short segment of 14 bytes or less, only a 4-bit segment length is used,
In the case of a relatively long segment of 1 byte or more and 254 bytes or less, a 4-bit segment length and 1-byte extended segment length 1 is used, and 255 bytes or more and 655
For fairly long segments of 35 bytes or less, a 4-bit segment length, a 1-byte extended segment length 1 and a 2-byte extended segment length 2 are used.

Subsequently, FIGS. 6, 7, 8A to 8D, and 9A to 9B show the layer 6 (segment data) of the DARC paging system. 6 is the content of the call data, FIG. 7 is an ID number consisting of 28 bits (b28 to b1) and the bit correspondence when the ID number is group-identified, FIG. 8A
Is the content of the message type of the ID, FIG. 8B is the structure of the number of calls, FIG. 8C is the content of the character type, FIG. 8D is the structure of the message data length, and FIG. 9A is the transmission cycle. The configuration, FIG. 9B, shows the contents of the transmission cycle.

As shown in FIG. 6, the contents of the calling data are as follows: ID group identification for each byte, and then the number of calls (N) whose message ID (MID) type is (00). About the first ID number for each byte, the second ID number for each byte, ..., The Nth ID number for each byte, and the message ID (MI
Regarding the number of calls (M) whose type in (D) corresponds to (01), the first ID number by byte, the second ID number by byte, ..., The Mth ID number by byte, After that, the message type of each case and the message data length of each case are followed by each message. In this case, 2
In the 8-bit (b28 to b1) ID number, the first 8 bits (b28 to b21) are the upper byte, the middle 8 bits (b20 to b13) are the middle byte, and the last 8 bits (b12 to b5). Is the lower byte and the remaining 4
Bits (b4 to b1) are assigned for each data group.

As shown in FIG. 7, 4 bits from the 5th bit to the 8th bit of the ID number (b8 to b5)
Is used to divide the ID number into 16 groups. ID group identification is
It indicates which group is being called. For example, 4 bits (b8 to b5) of the ID number are 5
, The 6th bit (b6) of the ID group identification becomes 1.

As shown in FIG. 8 (a), the message ID (MID) consists of 2 bits, and when those 2 bits are (00) = 1, it means that there is no ID message. When 2 bits are (01) = 1, it indicates that there is an ID message.

As shown in FIG. 8B, the number of calls is represented by 6 bits, of which a maximum of 62 IDs can be called. In this case, if the maximum number of calls exceeds 63, a 1-byte extended number of calls is added to the number of calls, and a maximum of 255 IDs can be called.

As shown in FIG. 8C, the character type is 2
Indicated by bits, when these two bits are (00) = 1, it is a 6-bit fixed message, when 2 bits are (01) = 1, it is a 4-bit number, fixed message, When 2 bits (10) = 2, it is a character, and when 2 bits (11) = 3, it is a binary data.

As shown in FIG. 8D, the message data length (number of message data calls) is represented by 6 bits, and the maximum message data that can be specified by this 6-bit message data length (number of message data calls). The length is 62 bytes. If the message data length exceeds 62 bytes, the extended message data length 1 is designated, and the maximum message data length that can be designated by the extended message data length 1 is 254 bytes. If the message data length exceeds 254 bytes, it is specified by the extended message data length 2, and the maximum message data length that can be specified by this extended message data length 2 is 65535 bytes.

Next, as shown in FIG. 9A, the transmission cycle is determined by the lower 4 bits (b4 to b1) of the ID number, and the lower 4 bits (b8 to b5) following the ID number. Is defined for each ID group number grouped by.

As shown in FIG. 9B, the content of the transmission cycle is not defined when 4 bits (0000) = 0, and 4 bits (0001) =
When it is 1, it is 1 frame period, when it is 4 bits (0010) = 2, it is 2 frame periods, and similarly, when 4 bits is (1110) = 14, it is 14 frame periods. When the four bits are (1111) = 15, it means that the transmission cycle is extended.

In addition to this, layer 6 (segment data)
Stipulates the number designation of fixed messages, the coding of numbers and fixed messages, the coding of characters, alternative frequency information, scramble information, common information, etc., but description of these contents will be omitted.

[0023]

Since the known paging system uses a peculiar transmission frequency and a dedicated paging signal receiver, the information amount of the paging signal to be transmitted is naturally limited. And moreover,
A dedicated paging signal receiver must be prepared separately.

Further, the DARC system paging system based on the provisional standard is still only an experimental test broadcast, and the timing of the main broadcast and the time of the main broadcast The contents of the system are undecided.

The present invention has been made in view of the above circumstances, and its purpose is to mount a vehicle-mounted vehicle capable of receiving a paging signal addressed to itself without leaking the battery while preventing battery consumption when the vehicle is not used. It is to provide an FM multiplex broadcast receiver.

[0026]

In order to achieve the above object, the present invention provides an FM multiplex broadcast receiving unit for receiving an FM multiplex broadcast signal, and a paging for selecting a paging signal in the received FM multiplex broadcast signal. Signal selector and received F
An audio signal reproducing section for reproducing an audio signal in the M-multiplex broadcast signal, a paging data memory for storing paging data, a display section for displaying the paging data, and a control section for controlling the overall operation, When the power supply of the vehicle-mounted FM multiplex broadcast receiver is turned off by turning off the accessory key of the vehicle, the control unit limits the FM multiplex broadcast receiving unit and the FM multiplex broadcast receiving unit to the timing period in which a paging signal addressed to itself is received. Switching only the paging signal selector and the paging data memory to the operating state,
The paging data received at that time and the reception time data of the data are stored in the paging data memory.

[0027]

In the above means, when the accessory key is turned off when the user leaves the vehicle, the power of the on-vehicle FM multiplex broadcast receiver is also turned off. However, when the power of the on-vehicle FM multiplex broadcast receiver is turned off, The control unit switches the FM multiplex broadcast receiving unit and the paging signal selection unit to the operating state each time immediately before the timing period in which the paging signal addressed to the own (user) is received, whereby the FM multiplex broadcast receiving unit is set to the self operation. A paging signal including a message addressed to (user) is received, and the paging signal selection unit extracts paging data including a message addressed to itself (user) from the received paging signal. Then, the control unit transfers the extracted paging data to the paging data memory together with the reception time data and stores the paging data in the paging data memory. When the storage of the paging data and the reception time data is completed, the FM multiplex broadcasting reception unit and the paging The signal selector is switched from the operating state to the non-operating state. Further, when the user turns on the accessory key, the control unit sequentially reads out the paging data and the reception time data from the paging data memory, and transfers them to the display unit for display.

As described above, according to the above means, when the accessory key is turned off, the FM multiplex broadcast receiving section and the paging signal selecting section are in the operating state only during the timing period in which the paging signal addressed to itself (user) is received. The in-vehicle FM multiplex broadcast receiver is kept inactive during other periods, so-called in-vehicle FM multiplex broadcast receiver is set to the intermittent reception state, so that the battery of the car is not consumed. In addition, the paging signal addressed to itself (user) can be received without leaking. Also, when the user turns on the accessory key, the message addressed to self (user) that was sent while the user was away from the car is displayed on the display, so you can view the message addressed to self (user) without leaking it. be able to.

[0029]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an on-vehicle FM multiplex broadcast receiver according to the present invention.

In FIG. 1, 1 is an FM tuner (FM multiplex broadcast receiver), 1a is an FM front end (F /
E) 1b is an intermediate frequency circuit and demodulation circuit (IF DE
T), 2 is an audio signal reproducing section, 2a is a multiplexer (MPX), 2b is an audio signal amplifier (AM)
P), 2c is a speaker (SP), 3 is a paging signal selection unit, 4 is a control unit, 5 is a paging data memory, 6 is a display unit, 7 is an antenna, and 8 is a car accessory (ACC).
Is the key.

The FM tuner 1 comprises an FM front end 1a and an intermediate frequency circuit / demodulation circuit 1b.
The audio signal reproducing unit 2 includes a multiplexer 2a,
It is composed of an audio signal amplifier 2b and a speaker 2c. The input of the FM front end 1a is connected to the antenna 7, and the output of the FM front end 1a is connected to the input of the intermediate frequency circuit / demodulation circuit 1b. The FM front end 1 a and the intermediate frequency circuit / demodulation circuit 1 b are each connected to the control unit 4. The output of the intermediate frequency circuit / demodulation circuit 1b is connected to the input of the multiplexer 2a and the input of the paging signal selection unit 3, and the two outputs of the multiplexer 2a are connected to the two inputs of the audio signal amplifier 2b, respectively. The two outputs of the audio signal amplifier 2b are individually connected to the speaker 2c (only one shown). The output of the paging signal selector 3 is the controller 4
The paging data memory 5, the display unit 6, and the accessory key 8 are also connected to the control unit 4.

The on-vehicle FM multiplex broadcast receiver of the present embodiment having the above-described configuration operates roughly as follows.

First, when the user is using a car,
That is, when the vehicle accessory key 8 is switched on and the power of the vehicle-mounted FM multiplex broadcast receiver is turned on, each part of the vehicle-mounted FM multiplex broadcast receiver is in an active state.

In this state, when the user selects a desired preset key (not shown), the control section 4
In response to the operation of the preset key, a tuning voltage of a predetermined voltage value is supplied to a tuning circuit (not shown) of the FM front end 1a, and the tuning circuit outputs the FM broadcast signal or FM multiplex broadcast signal of the desired station. Adjusted for reception.
At this time, when the FM broadcast signal or the FM multiplex broadcast signal of a desired station is captured by the antenna 7, the FM broadcast signal or the FM multiplex broadcast signal is subjected to high frequency amplification and conversion into an intermediate frequency signal at the FM front end 1a. And then
The intermediate frequency signal is subjected to intermediate frequency amplification and removal of noise components in the intermediate frequency circuit / demodulation circuit 1b, and then FM demodulated to be a demodulated signal. Subsequently, the demodulated signal is subjected to noise removal and demodulation into a stereo signal in the multiplexer 2a, and a left channel and right channel audio signal is obtained. Further, the audio signals of the left channel and the right channel are amplified by the audio signal amplifier 2b and are output as stereo signals by the left speaker 2c and the right speaker 2c, respectively. The above description is the operation when the FM broadcast signal or the FM multiplex broadcast signal of the desired station is received by the preset key selection operation. However, instead of selecting the preset key, the channel selection circuit of the FM front end 1a. Even when the FM multiplex broadcast signal is selected for tuning, the same operation is performed.

Further, in this state, the control unit 4 firstly outputs the FM multiplex broadcast signal obtained by FM-multiplexing the paging signal in the FM front end 1a for a certain period, for example,
Received for about 2 frames in the paging signal,
Based on the protocol of the received paging signal, i.e.
The arrival timing of a message addressed to the user is perceived from the user ID number included in the paging signal. Then, when the control unit 4 perceives the arrival timing of the message addressed to the user, the FM front end 1 a outputs the paging signal to the FM front end 1 a each time the arrival timing is reached.
A multiplexed FM multiplex broadcast signal is received. F received
The M multiplex broadcast signal is subjected to high frequency amplification and conversion into an intermediate frequency signal in the FM front end 1a, and intermediate frequency amplification and noise component removal and FM in the intermediate frequency circuit / demodulation circuit 1b.
Demodulation is performed and a demodulated signal is obtained. Next, with respect to this demodulated signal, message data addressed to the user is selectively extracted by the paging signal selection unit 3, and the extracted message data is supplied to the display unit 6 via the control unit 4, and the message data is displayed on the display unit 6. Then, the user can see the message data addressed to himself. It should be noted that prior to the display of the message data, the user may be notified by means of an alarm or the like that the message data will be displayed.

Next, when the user leaves the vehicle for a long time, that is, when the accessory key 8 of the vehicle is switched off and the power of the on-vehicle FM multiplex broadcasting receiver is turned off, In the FM multiplex broadcast receiver, each unit is inactive except for the control unit 4.

In this state, the control unit 4 in the operating state
The FM tuner 1, that is, the FM front end 1a, the intermediate frequency circuit / demodulation circuit 1b, the paging signal selection unit 3, and the paging data memory 5 each time the arrival timing of the perceived message addressed to the user is reached. Switch from the non-operating state to the operating state. At the time of this switching, the FM front end 1a receives the FM multiplex broadcast signal in which the paging signal is FM-multiplexed, and the received FM multiplex broadcast signal is subjected to high frequency amplification and conversion into an intermediate frequency signal in the FM front end 1a. The intermediate frequency circuit / demodulator circuit 1b performs intermediate frequency amplification, noise component removal, and FM demodulation to obtain a demodulated signal. Next, with respect to this demodulated signal, message data addressed to the user is selected and extracted by the paging signal selection unit 3, and the extracted message data is supplied to the paging data memory 5 via the control unit 4 to indicate the time when the message data was received. It is stored together with the reception time data. Here, when the storage of the message data and the reception time data in the paging data memory 5 is completed, the control unit 4 causes the FM front end 1a, the intermediate frequency circuit / demodulation circuit 1b, and the paging signal selection unit 3 to operate.
In addition, the paging data memory 5 is switched from the operating state to the non-operating state and returns to the initial state.
The multiplex broadcast receiver is set to the intermittent reception state.
The storage of the message data and the reception time data in the paging data memory 5 is repeatedly executed each time the message data addressed to the user arrives, and this operation state continues until the accessory key of the car is turned on again. Done.

Then, when the user turns on the car accessory key 8 to use the car again and thereby turns on the power of the on-vehicle FM multiplex broadcast receiver, the on-vehicle FM multiplex broadcast receiver is turned on. , Each part becomes active.

In this state, the control section 4 reads the message data and the reception time data stored in the paging data memory 5 in the order of oldness, and supplies the read message data and the reception time data to the display section 6, It is displayed on the display unit 6. In this case, when the message data and the reception time data displayed on the display unit 6 do not fit on one screen, they are sequentially displayed using a means such as scrolling.
At this time, the user can see the message data displayed on the display unit 6 without fail to know the content of the message of the paging signal addressed to him / herself while he is away from the vehicle. The message data and the reception time data stored in the paging data memory 5 are erased from the paging data memory 5 when all the data are displayed on the display unit 6.

As described above, according to the present embodiment, when the accessory key is off, the FM tuner 1, the paging signal selecting section 3 and the paging data memory are limited to the timing period in which the paging signal addressed to the user is received. 5 is switched to the operating state, the paging signal addressed to the user is received, and the message data addressed to the user is stored in the paging data memory 5, and the in-vehicle FM multiplex broadcast receiver is deactivated during other periods. Since the intermittent reception state is maintained, the battery of the vehicle can be prevented from being consumed and the paging signal addressed to the user can be received without leaking.

Further, according to the present embodiment, when the user turns on the accessory key, the message data addressed to the user transmitted while the user is away from the vehicle is sequentially displayed on the display unit 6, so that the user can You can see the contents of the message addressed to you without leaking.

[0043]

As described above in detail, according to the present invention, when the user leaves the vehicle for a long time, that is, when the accessory key of the vehicle is turned off, the timing at which the paging signal addressed to the user is received. FM only for the period
Only the multiplex broadcast receiving unit 1, the paging signal selecting unit 3 and the paging data memory 5 are switched to the operating state, the paging signal addressed to the user is received and the message data addressed to the user is stored in the paging data memory 5, and during the other periods. Keeps the in-vehicle FM multiplex broadcasting receiver in the inactive reception state, it is possible to receive the paging signal addressed to the user without leaking while preventing the battery of the vehicle from being consumed. .

Further, according to the present invention, when the user turns on the accessory key in order to use the car, the message data addressed to the user transmitted while the user is away from the car is sequentially displayed on the display section 6. As a result, the user can see the content of the message addressed to himself without leaking it.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an on-vehicle FM broadcast receiver according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of layer 1 (transmission path) and layer 2 (error correction) in the provisional standard of the DARC system paging system.

FIG. 3 is an explanatory diagram showing a configuration of layer 3 (data packet) in the provisional standard of the DARC system paging system.

FIG. 4 is an explanatory diagram showing a configuration of a layer 4 (data group) in the provisional standard of the DARC system paging system.

FIG. 5 is an explanatory diagram showing a configuration of a layer 5 (segment) in the provisional standard of the DARC system paging system.

FIG. 6 is an explanatory diagram showing a part of the configuration of layer 6 (segment data) in the provisional standard of the DARC system paging system.

FIG. 7 is an explanatory diagram showing another part of the configuration of layer 6 (segment data) in the provisional standard of the DARC system paging system.

FIG. 8 is an explanatory diagram showing still another part of the configuration of layer 6 (segment data) in the provisional standard of the DARC system paging system.

FIG. 9 is an explanatory diagram showing still another part of the configuration of layer 6 (segment data) in the provisional standard of the DARC system paging system.

[Explanation of symbols]

 1 FM tuner (FM multiplex broadcast receiving unit) 1a FM front end (F / E) 1b Intermediate frequency circuit / demodulation circuit (IF DET) 2 Audio signal reproducing unit 2a Multiplexer (MPX) 2b Audio signal amplifier (AMP) 2c Speaker (SP) 3 Paging signal selection unit 4 Control unit 5 Paging data memory 6 Display unit 7 Antenna 8 Car accessory (ACC) key

Claims (4)

[Claims] 1. An FM multiplex broadcast receiving unit for receiving an FM multiplex broadcast signal, a paging signal selecting unit for selecting a paging signal in the received FM multiplex broadcast signal, and a received F
An audio signal reproducing section for reproducing an audio signal in the M-multiplex broadcast signal, a paging data memory for storing paging data, a display section for displaying the paging data, and a control section for controlling the overall operation, When the power supply of the vehicle-mounted FM multiplex broadcast receiver is turned off by turning off the accessory key of the vehicle, the control unit limits the FM multiplex broadcast receiving unit and the FM multiplex broadcast receiving unit to the timing period in which a paging signal addressed to itself is received. Only the paging signal selector and the paging data memory are switched to the operating state,
An in-vehicle FM multiplex broadcast receiver characterized by storing paging data received at that time and reception time data of the data in the paging data memory. 2. When the power of the on-vehicle FM multiplex broadcasting receiver is turned on by turning on the accessory key of the vehicle,
The in-vehicle FM multiplex broadcast receiver according to claim 1, wherein, when a paging signal addressed to itself is received, the paging data is transferred to and displayed on the display unit. 3. The paging data and its reception time data stored in the paging data memory are sequentially read when the power of the vehicle-mounted FM multiplex broadcasting receiver is turned on by turning on the accessory key of the vehicle, and the display is performed. The on-vehicle FM multiplex broadcast receiver according to claim 1, wherein the FM multiplex broadcast receiver is mounted on a vehicle and displayed in order. 4. The paging data stored in the paging data memory and the reception time data thereof are read out, sequentially displayed on the display unit, and then erased from the paging data memory. Item 3
The vehicle-mounted FM multiplex broadcast receiver described in [1].