JPH0576128U - Radio data system receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a radio data system receiver which tunes to the best frequency without moving to a non-traffic information station by AF search. [Structure] The AF search means 12-2 searches the stored AF list, the PI code match detection means 12-3 detects the PI code match, and the receiving broadcast station is switched to another broadcast station having the matching PI code. In the radio data system receiver, the traffic information reception instruction detecting means 12-4 discriminates the traffic information reception instruction at the time of searching the storage AF list, and when the traffic information reception instruction is given, the traffic is followed by the PI code coincidence detection at the time of the search. The receiving station moving means 1 is discriminated by the TP code discriminating means 12-5 to be the information station, and only when it is discriminated as the traffic information station.
By 2-6, the receiving station is moved to another broadcasting station with the same PI code.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radio data system receiver of automatic tuning using an AF list in a radio data system (hereinafter referred to as RDS).

[0002]

[Prior Art]

 RDS is a system shown in the European Broadcasting Union Technical Specification (EBU document 3244), which allows listeners to easily search for their favorite radio programs. The function of this system includes a function to inform the RDS receiver that the frequency is assigned to another broadcasting station broadcasting the same program as the program currently being received. If it is possible to obtain a signal with a stronger frequency at the broadcasting station, it will be possible to switch the RDS receiver to receive the signal. Therefore, the RDS receiver receives and stores an alternative frequency code (referred to as an AF code in this specification) and searches a list of stored AF codes (referred to as an AF list in this specification).

In RDS, the RDS receiver automatically searches the AF list for broadcasting selection (hereinafter referred to as AF search), and in order to always select the strongest signal, a program recognition code (referred to as PI code in this specification). ) Is sent. The RDS receiver checks by AF search whether the selected station matches the station of the same program indicated by the PI code, and when they match, the receiving station is changed to that station.

Further, in the RDS, a traffic information station display code indicating that the broadcasting station is a station that broadcasts traffic information (referred to as a TP code in this specification) and a traffic information broadcasting display indicating that the traffic information is being broadcast. A code (denoted herein as a TA code) is sent. When the RDS receiver operates the traffic information receiving function, it receives the TP code and recognizes that the receiving station is the traffic information station, and when it receives the TA code, it receives the traffic information even if it is listening to another source. It is configured to switch to the station automatically.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional RDS receiver, a station with TP = 1, that is, a traffic information station that transmits traffic information and a station with TP = 0, that is, traffic information are transmitted at the respective frequencies of the same network transmitted with the same PI code. When a non-traffic information station that does not broadcast is mixed, the AF search confirms whether the PI code is the same and the receiving station is changed. In this case, even if the traffic information receiving function is turned on, the PI Since the receiving station moves only by matching the code, the receiving station after the movement may not be the traffic information station, and even if the traffic information station is received before the AF search, it moves to the non-traffic information station. However, there is a problem that traffic information may not be received.

An object of the present invention is to provide an RDS receiver that tunes to the best frequency without moving to a non-traffic information station by AF search.

[0007]

[Means for Solving the Problems]

 The RDS receiver of the present invention is a radio data system receiver in which a receiving broadcasting station is switched to another broadcasting station that searches the stored AF list and has a matching PI code, and has a traffic information receiving function when searching the stored AF list. When it is in the ON state, a confirmation means for confirming that it is a traffic information station following the PI code coincidence confirmation at the time of the search, and a PI code that coincides only when the confirmation means confirms that it is a traffic information station A receiving station moving means for moving the receiving station to the broadcasting station is provided.

[0008]

[Action]

 According to the RDS receiver of the present invention, when the traffic information receiving function is on during the search of the stored AF list, it is the traffic information station by the confirmation method following the PI code match confirmation at the time of the search. Is confirmed, and only when this confirmation is made, the receiving station is moved to another broadcasting station having the same PI code. Therefore, the receiving station will be moved only to the traffic information station, and even if the receiving station moves due to the AF search, the receiving station will not move to the non-traffic information station and traffic information reception can be continued. It will be.

[0009]

【Example】

 Hereinafter, the present invention will be described with reference to examples. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

The RDS receiver of this embodiment includes a front end 1, an intermediate frequency amplification circuit 2 for amplifying an intermediate frequency signal output from the front end 1, a detection circuit 3 for detecting the output of the intermediate frequency amplification circuit 2, and a detection circuit. A stereo demodulation circuit 4 that receives the output and performs stereo demodulation, a volume control circuit 5 that controls the audio signal level of the stereo demodulation circuit 4, a mute circuit 6 that mutes the volume-adjusted audio signal, and an output of the mute circuit 6 is amplified. The audio signal amplifier 7 and the speaker 8 driven by the output of the audio signal amplifier 7 are provided to perform a receiving operation.

Further, the RDS receiver includes a frequency synthesizer 9 which constitutes a local oscillator, an electric field strength detection circuit 10 which detects electric field strength information from the intermediate frequency amplifier circuit 2, and an RDS information which is synchronized with the RDS information during detection output. An RDS demodulation circuit 11 for demodulation is provided, and the electric field strength information detected by the electric field strength detection circuit 10 and the RDS information demodulated by the RDS demodulation circuit 11 are input to input an AF code, a PI code and a traffic information reception function. To the frequency synthesizer 9 based on the AF code and the PI code, while sequentially outputting the frequency division ratio data to the frequency synthesizer 9 while sending a mute signal to the mute circuit 6 during the AF search. It is provided with a microcomputer 12 that operates.

Here, the microcomputer 12 functionally detects the deterioration of the reception state by detecting that the electric field strength has dropped below a predetermined level, and a reception state deterioration determination means 12-1 and an AF code. To output the frequency division ratio data corresponding to the AF code to the frequency synthesizer 9 to perform an AF search, a PI code matching detection means 12-3, and a traffic information reception instruction during the AF search. Traffic information reception instruction detection means 12-4 for detecting whether or not the traffic information is received, and a TP code discrimination means for determining the traffic information station by discriminating the TP code in the received RDS data when the traffic information reception instruction is issued. 12-5 and a receiving station moving means 12-6 for moving the receiving station to another broadcasting station whose PI code matches only when it is determined to be a traffic information station. There is.

The operation of the present embodiment configured as described above will be described with reference to the flowchart of FIG.

During reception, it is checked whether or not the electric field strength detected by the charge strength detection circuit 10 is lower than a predetermined value (step S1), and if it is determined that the electric field strength is lower than the predetermined value, reception is performed. When it is determined that the state has deteriorated, the frequency division ratio data corresponding to the AF code stored in the RAM 13 is sent to the frequency synthesizer 9 to enter the AF search state (step S2). It is checked whether or not the AF-searched station matches the station indicated by the PI code (step S3). In this check, if it is not determined that the AF-searched station matches the station indicated by the PI code, the original receiving station is tuned again (step S4).

When it is determined in the check in step S3 that the AF-searched station matches the station indicated by the PI code, the traffic information reception function is turned on, that is, the traffic information is received. Is instructed (step S5). In the check in step S5, the instruction state for the traffic information receiving function stored in the RAM 13 is checked. This check is made, for example, by checking the state of the flag set in the RAM 13 when the communication information receiving function is instructed to operate.

When it is determined in step S5 that the traffic information receiving function is turned on, it is checked whether or not the selected station is a traffic information station as a result of the AF search (step S6). The check in step S6 is made by checking the TP code. As a result of the check in step S6, when it is determined that the selected station is the traffic information station, the receiving station is moved to the selected station, that is, the station whose PI code matches in the AF search (step S7). .

As a result of the check in step S6, when it is determined that the selected station is not the traffic information station, the original receiving station is tuned again (step S8). Therefore, when the traffic information reception function is turned on, it can be moved only to the traffic information station by AF search.

Next, in the RDS, an enhanced other network function (EON function) that can monitor the information about the broadcast of another station while receiving the broadcast of one station is introduced. With the EON function, the station concerned has TP = 0, but it also knows the information of other stations with TA = 1. Therefore, when the RDS receiver is configured to be compatible with the EON function, the determination of whether or not the traffic information can be received is made based on the state of TP = 0 and TA = 1. Therefore, the state of TA is also confirmed.

[0019]

[Effect of the device]

 As described above, according to the present invention, in a radio data system receiver in which a receiving AF station is switched to another broadcasting station whose PI code is matched by searching the stored AF list, the traffic information is received when the stored AF list is searched. When the function is on, after confirming the PI code match at the time of the search, it is confirmed by the confirmation means that it is a traffic information station, and the PI code matches only when it is confirmed that it is a traffic information station. Since the receiving station is configured to move to another broadcasting station, when the traffic information receiving function is on, the receiving station is moved to only the traffic information station, and the receiving station moves by AF search. However, the receiving station does not move to the non-traffic information station, which has the effect of continuing to receive traffic information.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of one embodiment of the present invention.

[Explanation of symbols]

 1 Front End 2 Intermediate Frequency Amplifier Circuit 3 Detection Circuit 4 Stereo Demodulation Circuit 5 Volume Control Circuit 6 Mute Circuit 7 Audio Signal Amplifier 9 Frequency Synthesizer 10 Electric Field Strength Detection Circuit 11 RDS Demodulation Circuit 12 Microcomputer 12-1 Receiving State Deterioration Means 12 -2 AF search means 12-3 PI code match detection means 12-4 Traffic information reception instruction detection means 12-4 12-5 TP code determination means 12-6 Receiving station moving means 13 RAM

Claims (1)

[Scope of utility model registration request] 1. A radio data system receiver in which a receiving AF station is switched to another broadcasting station that searches the stored AF list and has a PI code matching, and a traffic information reception function is turned on when the stored AF list is searched. Occasionally, a confirmation means for confirming that it is a traffic information station following the PI code coincidence confirmation at the time of the search, and another broadcasting station whose PI code coincides only when the confirmation means confirms that it is a traffic information station A radio data system receiver comprising: a receiving station moving means for moving the receiving station.