JPH06260897A - Radio receiver - Google Patents

Abstract

PURPOSE:To automatically update frequencies of different broadcast stations of program networks corresponding to respective preset keys to frequencies of other broadcast stations of respective networks at the time of switching to the radio mode from another mode. CONSTITUTION:When the radio mode is switched to the tape mode by a tape key 12b of an operation part 12, a broadcast station other than an RDS station which receives on the radio mode is automatically switched to the RDS station higher in the reception electric field strength by a system control part 14c of a controller 14 and receive. When the strength of the reception electric field of the RDS station is equal to a prescribed level or lower, the preset broad-cast station of a preset key 12c of the operation part is updated to another broadcast station of the program network based on prescribed data of another program network by a data register update part 14b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver for information multiplex broadcasting, and more particularly to a radio receiver capable of updating the same program broadcasting station of different program networks preset by a preset key.

[0002]

2. Description of the Related Art In a car radio, when a vehicle moves out of the service area during reception of a certain station, the station automatically reselects to a new station that is broadcasting the same broadcast, or traffic information broadcast. It would be convenient to be able to automatically switch from another source to a radio broadcast when is started. For this reason, West Germany, Australia, Switzerland, etc. have adopted the ARI (Automatic Radio Information) system to broadcast traffic information at appropriate times and
The identification code data indicating that the current receiving station is a traffic information broadcasting station or the identification code data indicating that the traffic information is being broadcast is superimposed on the M broadcast signal, and the traffic information can be easily transmitted by using these identification code data. I try to listen.

By the way, when a car moves a long distance and leaves the service area of a receiving station, a re-selection station is required each time. For this reason, in addition to being able to easily obtain traffic information, it is required to enhance the tuning function. In particular, FM broadcasting, which has a relatively small service area, is the main body of radio broadcasting services, and this requirement is strong in Europe where the broadcast reception rate of car radio is high. Therefore, in order to meet this demand, RDS (Radio Data System) has been proposed by the European Broadcasting Union and is being put to practical use.

This RDS is a method of superimposing various digital data on an FM radio broadcast signal, and the message is (1) program identification code (PI) of the currently received FM broadcast (2) broadcast station name ( PS) (3) Broadcasting station frequency list (AF) during the same program broadcast (4) Program content identification code (PTY) (5) Transmission status identification code (DI) (6) Music or conversation identification code (M / S) and (7) Traffic information broadcasting station identification code (TP) (8) Traffic information broadcasting identification code (TA). The above (1) to (6) are information related to the channel selection function, and (7) and (8) are traffic information.

As described above, the FM received by the RDS is
Since messages related to broadcasting, traffic information, and the like are transmitted in a multiplexed manner, it is possible to perform exceptional channel selection operations and traffic information reception operations that have never been done using these messages.

For example, a broadcasting station frequency list (AF list) and a program (broadcast program) identification code (PI code) which are broadcasting the same program are demodulated, and the received electric field strength of the current receiving station is set based on the data. When the level falls below the level, the AF stations on the AF list are sequentially tuned to check the reception electric field strength (referred to as AF search), and when the AF station having the maximum reception electric field strength is received, the A station is detected.
It is determined whether the PI code of the F station matches the original receiving station. If the PI code of the F station matches, the AF station is received. If the PI code of the F station does not match, the AF station having the next largest received electric field strength is received. It can be carried out.

In countries such as England and Sweden, EON (Enhanced Other Network) is used.
The data called k) is transmitted in a data structure of type 14A, and PI, A relating to a program network other than the program network of the broadcast being received.
It has information such as F, TP, and TA. Therefore, by using this EON information, it is possible to easily select a broadcasting station of another network.

FIGS. 2 and 3 each show an example of an RDS data format transmitted by being superimposed on an FM broadcast signal. FIG. 2 is a type 0A group for transmitting RDS data relating to the program network of the FM broadcast signal itself. Among four blocks, PI (TN) is the first block, group address is the TP, and TP is the second block. (TN), PTY (TN), TA
(TN) etc., two AFs (TN) in the third block, fourth AF
Two characters of PS (TN) are sent in blocks. (T
N) indicates that the program network of FM broadcasting is involved.

FIG. 3 shows a type 14A for transmitting RDS data relating to another program network different from the FM broadcast signal. Among four blocks, PI (TN) is the first block and second block is the second block. Group address, TP (TN), PTY (TN), T
P (EON), information address, PS (EON) for two characters in the third block, two AF (EO)
N), tuning frequency (TN) and mapped FM frequency (EON) or mapped LF /
MF frequency (EON), PTY (EON) and TA (EO
N) etc., the information corresponding to the information address, PI (EO) in the fourth block
N) is sent. (EON) indicates that it relates to another program network different from FM signal broadcasting. Therefore, AF (EON) and mapped FM frequency (EO
It is possible to switch the receiving station to another desired program network by using the tuning data such as N) or PI (EON).

That is, in the conventional receiver for RDS having a preset key, the preset key 1, for example, in the radio (FM reception) mode is used by using the EON information.
When presetting broadcasting stations with different PIs (different program networks) in 2 and 3, preset key 1 is a broadcasting station broadcasting EON, and EO
Assuming that N information has been obtained, when the reception electric field strength of the broadcasting station of the preset key 1 being received becomes weak, the broadcasting station broadcasting the same content in the same network is automatically selected and the preset key E obtained by one broadcasting station
Based on the ON information, the frequency of the broadcasting station (mapped FM frequency) corresponding to each PI of the preset keys 2 and 3 can be automatically preset-updated.

FIG. 4 shows the different P obtained as EON information.
It is a mapped FM frequency table which shows an example of the mapped FM frequency corresponding to I. Explaining in detail based on the mapped FM frequency table of FIG. 4, for example, when a car is in the area A and the frequencies that can be received in the area are respectively set to the preset key 1 by the PI1 of 92.0 MHz (EON broadcasting station) and the preset key 2 by the preset key 2. 94.0 MH which is PI2
z, it is assumed that the preset key 3 is preset to 96.0 MHz which is PI3. Here, when the car moves from the area A to the area C while receiving 92.0 MHz of the preset key 1, 92.0 MHz of the preset key 1
z is 92.4 MHz due to the original automatic tracking of RDS (Fig. 2
And the tuning frequency in FIG. 3)
To receive.

Therefore, referring to FIG. 4, 92.4 MHz
When the mapped FM frequency of the C area corresponding to
The mapped FM frequency corresponding to PI2 is 94.4M.
The mapped FM frequency corresponding to PI3 is 96.4 MHz. Therefore, 94.0 MHz of preset key 2 is automatically updated to 94.4 MHz, and 96.0 MHz of preset key 3 is updated to 96.4 MHz.
Update to z. Further, the receiver for RDS is performing the receiving operation even in the tape mode, for example, other than the radio mode, and if the RDS station is received and the EON information is obtained, the preset is automatically updated. be able to.

[0013]

However, in the conventional radio receiver for RDS, in the radio (FM receiving) mode, for example, the preset keys 1, 2, 3 are different in R with different PIs.
Assuming that each DS station is preset and EON information has been obtained, when the reception electric field strength of the RDS station of the preset key 1 being received becomes weak, the broadcasting station automatically broadcasting the same content in the same network is selected. In addition to being able to select a channel, the preset keys 2 and 3 can automatically update preset frequencies (mapped FM frequencies) of broadcasting stations corresponding to the respective PIs. Further, when a broadcast station other than the RDS station is being received, when the received electric field strength becomes weak, the channel is usually manually reselected, so that there is no discomfort.

However, for example, when a broadcast station other than the RDS station is being received and the mode is switched to another mode such as the tape mode, since it is not the RDS station, even if the EON information is obtained, the preset broadcast station is automatically operated. Since it is not possible to update, there is a strange feeling that the same broadcast cannot be received even if the preset key is pressed when the tape mode is switched to the radio mode again.

Therefore, an object of the present invention is to automatically change the frequency of a different broadcasting station of the program network corresponding to each preset key to the frequency of another broadcasting station of each network when switching from another mode to the radio mode. To provide a radio receiver that can be updated automatically.

[0016]

In order to achieve the above-mentioned object, a radio receiver for information multiplex broadcasting, in which predetermined data relating to a program network of the broadcasting station and other program networks is superimposed on an FM broadcasting signal, , A plurality of preset keys for presetting a broadcasting station, a mode switching unit for switching from the radio mode to another mode, and a radio mode for receiving when the radio mode is switched to another mode by the switching unit When the broadcasting station is other than the information multiplex broadcasting station, the broadcasting station automatically shifts to the information multiplex broadcasting station having a large received electric field strength, and the automatic receiving unit for receiving the information and the received electric field strength of the information multiplex broadcasting station are predetermined. When the level falls below the preset level, the preset key will be released based on the predetermined data from other program networks. A station is accomplished by a preset update section for updating the broadcast station of another program network.

[0017]

[Operation] When the radio mode is switched to another mode by the mode switching unit and the receiving broadcast station is not the information multiplex broadcasting station in the radio mode, the broadcasting station automatically changes to the information multiplex broadcasting station having a large received electric field strength. When the reception electric field strength of the information multiplex broadcasting station falls below a predetermined level, the preset broadcast station of the preset key is broadcast to another program network based on the predetermined data of the other program network. Let the station update.

[0018]

1 is a block diagram of the essential parts of an RDS (radio data system) receiver according to the present invention. FIG. 1 is a block diagram of an essential part of an RDS (radio data system) receiver according to an embodiment of the present invention. Reference numeral 1 denotes a PLL circuit, which outputs a predetermined voltage signal corresponding to a station to be received to the FM front end 2. The FM front end 2 receives the broadcasting station input from the antenna ANT based on the voltage signal, and generates a predetermined intermediate frequency signal (IF). Three
Is an intermediate frequency detection amplifier, which amplifies and detects the intermediate frequency signal converted by the FM front end 2 to a predetermined level.

Reference numeral 4 denotes an MPX, which is an intermediate frequency detection amplifier 3
The detected signal input from is demodulated into a stereo signal. 5
Is a switch for switching between radio and tape sources, 6
Is an amplifier (AMP), which amplifies a stereo signal according to a volume setting value (not shown). Reference numeral 7 is a speaker, which is driven by the amplifier 6 and outputs an audio signal. 8
Is an RDS decoder, which demodulates RDS data (AF list, PI data, etc.) sent at a predetermined transmission timing. An error detection / correction circuit 9 detects an error in the RDS data demodulated by the RDS decoder 8 in synchronization with each group and corrects the error.

A signal meter 10 monitors the signal strength (for example, electric field strength) by detecting the intermediate frequency signal output from the intermediate frequency detection amplifier 3 by direct current, and detects the signal strength of the receiving station. Reference numeral 11 is a display unit for displaying the reception frequency and the like. An operation unit 12 has a radio key 12a for switching to a radio mode, a tape key 12b for switching to a tape mode, and a preset key 12c having six preset keys numbered 1 to 6. Reference numeral 13 denotes a tape playing unit, which performs a PLAY operation and a pause operation under the control of a controller described later.

Reference numeral 14 is a controller, and the configuration of the controller 14 will be described in detail. First, 14a is RDS
Data (PI, AF, TP, TA, etc.) is stored for each program network, and the preset key 12c of the operation unit 12 is used to store the frequency of a desired broadcasting station and the PI of the program network to which the frequency belongs to the preset key 12c. A memory 14b is an RDS decoder 8 that is associated with and stores other data.
The RDS data demodulated in step S1 is registered in the memory 14a, and when the signal strength of the RDS station is monitored and the AF station is received, the mapped FM frequency for that AF station is obtained, and the memory is stored according to each preset key 12c. 1
A data registration / update unit for updating the frequency corresponding to the PI preset in 4a, 14c is a system control unit, and (1) monitors the signal meter 10 of the receiving station (RDS station) to receive the electric field strength of the receiving station. When becomes weak,
AF search is performed, (2) a preset frequency is called according to an operation command from the preset key 12c of the operation unit 12, and (3) a radio key 12a of the operation unit 12 is called.
When the mode is switched from the tape mode to the tape mode in response to a switching command from the or the tape key 12b, or (4) the mode is switched from the radio mode to the tape mode, when the EON information is not obtained, the seek operation is performed to turn the EON on. E when receiving the broadcasting station sending information
If the broadcasting station other than the RDS station is receiving before collecting the ON information and (5) switching to the tape mode, first select the broadcasting station with the highest received electric field strength among the preset RDS stations. If the RDS station is received and the RDS station is not preset, the seek operation causes the RDS station having the maximum signal strength to be received.

FIGS. 5 and 6 are flowcharts for explaining the operation of the controller 14, and the preset update in another mode of the present invention will be described in detail according to the flowcharts. In FIG. 5, when the system control unit 14c of the controller 14 receives a command to switch to the radio mode by pressing the radio key 12a of the operation unit 12 (step 1
01), first, it is judged whether or not the EON information is obtained in the memory 14a (step 102), and if it is obtained, the process proceeds to step 103.

If the EON information is not obtained in the process of step 102, the process proceeds to step 103, and the EON information of the EON broadcasting station is received by the seek operation (step 1
03). After that, the process proceeds to step 104 to sequentially receive the preset broadcasting stations (step 10
4). Therefore, the system control unit 14b checks the broadcasting station stored in the memory 14a corresponding to the preset key 14c and whether or not the broadcasting station is an RDS station (step 105). If there is such a broadcasting station (step 106), that broadcasting station is received (step 107). If there is no broadcasting station with the maximum signal strength in the process of step 106, the seek operation is started (step 108), the process returns to step 105, and the same process is repeated.

Referring now to FIG. 6, the current receiving station (R
The signal strength of the current receiving station is monitored by the signal meter 10 for the purpose of maintaining a good reception state of the signal strength of the DS station), and when the signal strength falls below a predetermined level (step 1
09), the system control unit 14c obtains the AF frequency from the AF list stored in the memory 14a, outputs a frequency control signal for each AF station to the PLL circuit 1, and outputs each AF frequency.
The search is started (step 110). When the AF station having the maximum signal strength is received (step 111), it is compared with the signal strength level of the original receiving station (step 112), and if it is not higher than the signal strength level of the original receiving station, it is returned to the original receiving station (step 112). Step 113). Thereafter, the process returns to step 109 and the same processing is repeated.

On the other hand, if the signal strength level of the received AF station is higher than the signal strength level of the original receiving station in step 112, the data registration unit 14b of the controller 12 causes the RDS decoder 8 and the error detection / correction circuit 9 to operate. Through A
The RDS data of the AF station such as the F list and the PI data is read (step 114), and then the system controller 14b checks the PI data stored in the memory 14a (step 115). If the PI data does not match. For example, the AF station having the next largest signal strength is received (step 116), and thereafter the process returns to step 112 to repeat the same processing.

If the PI data match in step 115, the system controller 14b confirms the reception of the AF station as the current receiving station (step 113). Therefore, the data registration update unit 14b stores the RDS of the receiving station in the memory 14a.
Mapped F corresponding to the preset PI of the broadcasting station stored in the memory 14a while registering the data
The M frequency is calculated and updated (step 118). Thereafter, the process returns to step 109 and the same processing is repeated.

The present invention is an RDS (radio data system) containing traffic information data in Europe.
It is also applicable to not only receivers for radio data systems but also receivers for radio data systems such as RDBS (Radio Data Broadcasting System) containing traffic information data in the United States.

[0028]

As described above, according to the present invention, when the radio mode is switched from the radio mode to another mode by the mode switching unit and the receiving broadcast station is other than the information multiplex broadcasting station in the radio mode, the electric field received from the broadcasting station is received. Automatically shift to a high-strength information multiplex broadcasting station and receive it, and when the received field strength of the information multiplex broadcasting station falls below a predetermined level, preset key preset based on predetermined data of other program network Since the broadcasting station is updated to the broadcasting station of another program network, it is automatically preset even when the RDS station is not received in the previous radio mode when switching from the other mode to the radio mode. You can update the station.

[Brief description of drawings]

FIG. 1 is an RDS (radio data system) according to the present invention.
FIG. 3 is a block diagram of a main part of a receiver for use.

FIG. 2 is an explanatory diagram showing an example of an RDS data transmission format.

FIG. 3 is an explanatory diagram showing an example of an RDS data transmission format.

FIG. 4 is a mapped FM frequency table showing an example of a mapped FM frequency corresponding to each PI.

5 is a first flow chart for explaining the operation of the controller 14 of FIG. 1. FIG.

6 is a second flow chart for explaining the operation of the controller 14 of FIG. 1. FIG.

[Explanation of symbols]

 1 PLL circuit 2 FM front end 3 Intermediate frequency detection amplifier 8 RDS decoder 9 Error detection and correction circuit 10 Signal meter 12 Operation part 12a Radio key 12b Tape key 12c Preset key 14 Controller 14a Memory 14b Data registration update part 14c System control part

Claims (1)

[Claims] 1. In a radio receiver for information multiplex broadcasting, wherein a plurality of preset keys for superimposing predetermined data on a program network of the broadcasting station and another program network are superimposed on an FM broadcasting signal, and a plurality of preset keys for presetting the broadcasting station. , A mode switching unit for switching from the radio mode to another mode, and when the radio mode is switched to another mode by the switching unit, if the receiving broadcast station in the radio mode is other than the information multiplex broadcasting station, the broadcast From the station to an information multiplex broadcasting station with a large received electric field strength, and an automatic receiving unit for automatically receiving, and when the received electric field strength of the information multiplex broadcasting station falls below a predetermined level, another program network Based on the specified data, the preset station of the preset key can be set to the station of another program network. Radio receiver characterized by comprising a preset update section for updating, the