JP2564415Y2 - Radio data system receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio data system receiver for storing data of a radio data system (hereinafter referred to as RDS).

[0002]

2. Description of the Related Art RDS is a system described in the European Broadcasting Union Technical Specification (EBU document 3244), which allows a listener to easily search for a desired radio program. Among the functions of this system is a function of notifying an RDS receiver that a frequency is allocated to another broadcasting station that is broadcasting the same program as the program currently being received. If a signal with a stronger frequency can be obtained from the broadcasting station, it is possible to switch the RDS receiver to the reception there. For this reason, the RDS receiver receives the instruction to automatically store the RDS data, stores the data of the alternative frequency (hereinafter referred to as AF data), and searches for a list of stored AF data (hereinafter referred to as a stored AF list). Is performed.

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

[0004]

However, in the above-described conventional RDS receiver, the storage of the PI code is effective only in a specific band determined by the manufacturer, and the RDS
There has been a problem that the RDS data cannot be completely stored where the broadcast station can receive a large amount of data, and there is no data to be stored at all where the RDS broadcast station cannot receive the data even if an automatic storage instruction is issued.

An object of the present invention is to provide an RDS receiver capable of switching between automatic storage of all normal receivable broadcast station information and automatic storage of a PI code at the will of the user.

[0006]

An RDS receiver according to the present invention comprises: broadcast station information automatic storage instruction means; and receivable station detection means for detecting a receivable broadcast station when the broadcast station information automatic storage instruction is issued. RDS data storage instructing means, and when the broadcast station information automatic storage instruction is given and the RDS data storage instruction is given, the PI code and the division ratio data of the RDS broadcast station among the receivable broadcast stations are stored in the storage means. And storage control means for storing the division ratio data of the receivable broadcast station in the storage means when the broadcast station information automatic storage instruction is given and the RDS data storage instruction is not given. I do.

Further, the storage control means, when the transmission information automatic storage instruction is given and the RDS data storage instruction is not given, the division ratio data of the broadcast stations other than the RDS broadcast stations among the receivable broadcast stations. You may make it memorize | store in a memory | storage means.

[0008]

According to the RDS receiver of the present invention, based on whether or not the broadcast station information automatic storage instruction has been issued and whether or not the RDS data storage instruction has been issued, the storage means can detect and receive the broadcast reception information in the broadcast station. Either the PI code of the RDS broadcasting station and the dividing ratio data are stored, or the dividing ratio data of the broadcast station that can be detected is stored in the storage means, and either one can be selected based on the user's will. Is done.

[0009] If the transmission station information automatic storage instruction is given and R
When the DS data storage instruction is not issued, when the frequency division ratio data of the broadcast stations other than the RDS broadcast stations among the detectable receivable broadcast stations is stored in the storage means, the RDS broadcast stations among the detectable receivable broadcast stations are stored. The frequency division ratio data of other broadcast stations are stored in the storage means.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG.
FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention.

The RDS receiver according to the present 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 an output of the intermediate frequency amplification circuit 2, and a detection output. Stereo demodulation circuit 4 for receiving and demodulating in stereo, a volume adjustment circuit 5 for controlling the audio signal level of stereo demodulation circuit 4, a mute circuit 6 for muting the audio signal whose volume has been adjusted, and a mute circuit 6
Signal amplifier 7 for amplifying the output of the audio signal amplifier 7
The speaker 8 is driven by the output of (1) and performs a receiving operation.

The RDS receiver further includes a frequency synthesizer 9 constituting a local oscillator, an electric field intensity detection circuit 10 for detecting electric field intensity information from the intermediate frequency amplifier circuit 2, and RDS information synchronized with the RDS information from the detection output. R to demodulate
A DS demodulation circuit 11;
Field strength information detected from 0 and RDS demodulation circuit 11
, And selectively stores the information on the receivable broadcasting station and the PI code in the RAM 13 based on whether or not the RDS data storage instruction is given,
Microcomputer for transmitting division ratio data corresponding to a stored broadcasting station to frequency synthesizer 9 in accordance with an instruction, and transmitting a mute signal to mute circuit 6 during a search for receivable stations and RDS broadcasting stations to perform a mute operation. 12 are provided.

Here, the microcomputer 12 functionally receives an instruction from the broadcast station information automatic storage instruction switch 14, detects whether the electric field intensity detection output exceeds a threshold value, and detects a receivable broadcast station. Possible station detecting means 12
-1 and the discriminating means 12-2 for discriminating the instruction from the RDS data storage instructing switch 15. Based on the discrimination by the discriminating means 12-2, the division ratio data of the receivable broadcasting station, or the division ratio data and PI Storage control means 12-3 for storing the code in the RAM 13;

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

When the broadcast station information automatic storage switch 14 instructs automatic storage of broadcast station information, the receivable broadcast station is detected. That is, the frequency division ratio data is sent to the frequency synthesizer 9 and set in the frequency synthesizer 9 (step S1). A broadcast having a frequency determined by the setting of the frequency division ratio data is received, and the output of the electric field intensity detection circuit 10 at that time is received. It is determined whether or not exceeds a threshold value, and it is determined that reception is possible (step S2). If it is determined in step S2 that the electric field strength is equal to or less than the threshold, it is determined that reception is impossible, and step S1 is executed again to transmit the next frequency division ratio data to determine whether reception is possible. .

If it is determined in step S2 that the electric field strength exceeds the threshold, it is determined that reception is possible, and the instruction of the RDS data storage instruction switch 15 is checked (step S3), and the RDS data storage instruction is issued. If it is determined that the broadcast that can be received is R
It is checked whether it is a DS broadcast station (step S4).

If it is determined in step S4 that the station is an RDS broadcasting station, the frequency division ratio data and the PI code corresponding to the broadcasting station are stored in the RAM 13 (step S5). Subsequent to step S5, the process is repeated from step S1 until all the frequency division ratio data ends (step S6). When it is determined in step S4 that the RDS broadcast station does not appear, step S5 is skipped and step S6 is performed. When it is determined in step S6 that the processing has been completed for all of the frequency division ratio data, the processing ends. Therefore, when the RDS data storage instruction is given, the RDS data is stored in the RA together with the frequency division ratio.
It will be stored in M13.

When it is determined in step S3 that the instruction to store the RDS data has not been issued, the frequency division ratio data of the receivable broadcasting station is stored in the RAM 13 (step S7), and then step S6 is executed. You. Therefore, the RDS data storage instruction switch 15 sets R
When the DS data storage instruction is not issued, the frequency division ratio data corresponding to the receivable broadcast station is stored in the RAM 13.

In the above-described embodiment, when the RDS data storage instruction is not issued by the RDS data storage instruction switch 15, the case where the frequency division ratio data of all receivable broadcast stations are stored has been described. , The frequency division ratio data of only the broadcasting stations that are not the RDS broadcasting stations among the receivable broadcasting stations may be stored.

[0020]

As described above, according to the present invention, the broadcast station information storage instruction means and the RDS data storage means are provided, and the broadcast station information automatic storage instruction is issued, and the RDS
Based on whether or not the data storage instruction is given, the storage means stores the PI code and the division ratio data of the RDS broadcast station among the receivable broadcast stations, or the division ratio data of the detectable receivable broadcast station. Can be selected to be stored in the storage means, the broadcast station information automatic storage instruction is issued in the RDS broadcast receivable area, and the RDS data storage instruction data is used to detect the RDS broadcast station among the receivable broadcast stations. The PI code and the division ratio data can be stored in the storage means, and the broadcast station information is automatically instructed in the RDS broadcast unreceivable area, and the RDS data storage instruction is not issued, so that the frequency of the detected receivable broadcast station can be divided. There is an effect that the ratio data can be stored in the storage means.

[Brief description of the drawings]

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

FIG. 2 is a flowchart for explaining the operation of the embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front end 2 Intermediate frequency amplification 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 intensity detection circuit 11 RDS demodulation circuit 12 Microcomputer 12-1 Receivable station detection means 12 -2 determination means 12-3 storage control means 13 RAM 14 broadcast station information automatic storage instruction switch 15 RDS data storage instruction switch

Claims (2)

(57) [Scope of request for utility model registration] 1. A broadcast station information automatic storage instruction means, a receivable station detection means for detecting a receivable broadcast station when the broadcast station information automatic storage instruction is issued, an RDS data storage instruction means, a broadcast station information automatic instruction means. Storage instruction is given and RDS
When the data storage instruction is given, the PI code and the frequency division ratio data of the RDS broadcast station among the receivable broadcast stations are stored in the storage means, and the broadcast station information automatic storage instruction is given and the RDS data storage instruction is given. And a storage control means for storing the frequency division ratio data of a broadcast station which can be detected and received when not in a storage means. 2. A broadcast station information automatic storage instruction means, a receivable station detection means for detecting a receivable broadcast station when the broadcast station information automatic storage instruction is issued, an RDS data storage instruction means, and a broadcast station information automatic instruction means. Storage instruction is given and RDS
When the data storage instruction is given, the PI code and the frequency division ratio data of the RDS broadcast station among the receivable broadcast stations are stored in the storage means, and the broadcast station information automatic storage instruction is given and the RDS data storage instruction is given. A radio data system receiver, comprising: a storage control unit for storing frequency division ratio data of a broadcasting station other than the RDS broadcasting station among the broadcasting stations that can be detected and received when it is not.