JP2563623Y2 - RDS receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RDS receiver, and more particularly to an RDS receiver which can be quickly switched to another station at the start of EON traffic information.

[0002]

2. Description of the Related Art An RDS (Radio Data System) for providing various services to a driver by digitally multiplexing music selection and program identification data on an FM radio broadcast signal.
stem) has been commercialized in Europe,
In the future, not only in the European region, it is expected to spread worldwide. The RDS radio wave transmitted from the broadcast station is received by the on-vehicle tuner. For example, when the location changes during driving and the reception station radio wave is weakened, the broadcast radio wave of the same program broadcast can be received one after another. It has such a search function. Typical RDS services include a P1 (program identification) service for identifying a country, a receiving area, and a program name of a broadcasting station, and a PS (receiving station name display) service for displaying the name of a receiving broadcasting station on a tuner display. ,
The above-mentioned AF (similar program broadcast frequency list) service for displaying other broadcast station frequencies broadcasting the same program, the TP service for identifying a station for broadcasting traffic information, and the like are available.

[0003] In the AF service, an AF list is set in RDS data, and the list is transmitted according to a format specified by EBU (European Broadcasting Corporation). Normally, the format of RDS data is to time-divide digital time-series data,
The above various services are transmitted as divided groups. In the above RDS receiver, a so-called EON (Enhanced Other Network) for transmitting network information of another area is provided.
k) A compatible RDS receiver has been put to practical use. EON is
This service is effective when receiving national (nationwide) broadcasts without transmission of traffic information data and wishing to receive local broadcast traffic information.

The operation processing procedure of the conventional EDS-compatible RDS receiver will be described with reference to FIG. First, the other station (O
It is determined whether the camera is in the AF search state (ther Network: ON) (step S21).
The AF list is read in the determined order (step S22),
The station (station) reception state is checked by, for example, checking whether or not the antenna input is 20 dB or more (judgment with SD: step S23). If there is an SD, it is determined whether or not it is a PI (Program Identity) of the same other station (ON) (whether or not it is the same broadcasting station) (step S24).
It is determined whether or not the traffic information (TA: Traffic Announcement) is “on” (step S25). Here, when TA is “on”, the ON AF station is received (step S2).
6). On the other hand, when it is determined that there is no SD in step S23, when it is determined that they are not the same ON PI in step S24, or when TA is not in the “on” state, it is determined whether all the ON AF searches have been completed. Judgment (step S29), if not completed, returns to the processing of step S22, and if completed, returns to the processing of step S21. Now, in step S26, after receiving the ON AF station, it is determined whether or not TA is "off" (step S27). When TA is turned "off", the original receiving station (TN: Thi)
s Network) (step S28) and step S2
It returns to the process of 1.

[0005]

As described above, in the conventional EDS-compatible RDS receiver, the EON AF is based on the so-called method A in which a maximum of 25 broadcast station frequencies are sequentially and repeatedly transmitted. When
EON AF for the first time since EON traffic information started
Therefore, it takes a considerable time to receive and switch to a desired other station (ON), and there is a problem that it is not possible to efficiently and quickly receive traffic information of another station.

[0006] Therefore, the purpose of this invention is to use the AF of EON.
An object of the present invention is to provide an RDS receiver that can always quickly switch to an AF with a good reception state even when transmission is performed by method A.

[0007]

In order to solve the above-mentioned problems, an RDS receiver according to the present invention includes an RDS including similar station (AF) data and EON data relating to another station (ON).
In an RDS receiver for receiving data and automatically switching to a station having a better reception state by an AF search based on the AF data and automatically switching to a traffic information station, the RDS receiver performs the AF search operation, About EON
Means for measuring the reception state of the data AF list and storing it in a memory; means for searching the EON AF list in the order of good reception state based on the contents stored in the memory;
It is comprised including.

[0008]

In this invention, the S meter level information of the other station (ON) AF is stored in the memory during the AF search of the current receiving station (own station), and the S meter level read out from the memory at the time of the ON AF search. , That is, the EON AF list is searched in the order of good reception, so that quick and accurate ON AF search can be performed.

[0009]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing an operation and a processing procedure in an embodiment of the RDS receiver according to the present invention, and FIG. 2 is a block diagram showing a configuration thereof. This idea is
At the same time as the normal AF search, the reception status of the EON AF list data is checked by the S meter level, and the EON
In this AF, a list of stations with particularly good reception conditions is created and searched.

The RDS receiver according to this embodiment is configured as shown in FIG. The reception signal received by the antenna ANT is converted into an IF signal at the front end (F / E) 1 and detected at the IF detector (IF / DET) 2. The front end 1 has a voltage controlled oscillator VC
O and a mixer MIX are built in, and the reception frequency is set based on control data from the system microcomputer 10 in cooperation with the PLL circuit 9. That is, the oscillation signal OSC from the VCO is sent to the PLL circuit 9, and the low-pass component of the PLL output signal is extracted by the low-pass filter (LPF) 8, and is supplied as the VCO control signal Vt. The noise component of the signal detected by the IF detector 2 is suppressed by the noise canceller 3, the signal is stereo-demodulated by the multiplexer (MPX) 4, and the volume is adjusted by the volume circuit (VOL) 5. The signal whose volume has been adjusted in this way is amplified by the amplifier 7 via the mute circuit 6, and the peak (SP)
Output from The mute operation of the mute circuit 6 is controlled by a mute control signal from the system microcomputer 10. A detection signal from the IF detector 2 is demodulated by an RDS demodulator (RDS DEMO) 11, RDS data is extracted, and the synchronization microcomputer 12 synchronizes the RDS data for each group of RDS data. The operation is performed and the operation and control described in detail below are performed.

Next, an operation processing procedure in this embodiment will be described with reference to FIG. First, it is determined whether or not the other station (ON) is in the AF search state (step S1). If it is not in the search state, it is determined whether or not the own station is in the TN (This Network) AF search state (step S2). ). Performs TN AF search and turns on if TN AF search is in progress
The S meter level of the AF is monitored (checked) (step S3), and the S meter level of each ON AF list is set to R.
After storing it in the AM (step S4), the process returns to step S1. On the other hand, in the ON AF search state in step S1, the ONAF S meter is read in descending order (step S5), and the presence or absence of SD is determined (step S6). When it is determined that SD exists, the same ON
It is determined whether it is PI or not (step S7), and if it is the same, it is determined whether TA is in the “on” state (step S8).
If the TA is in the "on" state, the ON AF station is received (step S9), and it is repeatedly determined whether the TA is "off" (step S10). In step S10, when the TA reaches the “off” state, the original TN station is received (step S11), and the process proceeds to step S1. In step S6, S7 or S8, S
No D, not the same ON PI, or TA is "o
If it is determined that the state is not the “n” state, it is determined whether or not the search of all ON AFs has been completed (step S12). If completed, the process returns to step S1, and if not completed, the process of step S5. Return to

[0012]

[Effects of the Invention] As described above, the value of R
The DS receiver stores the meter level information of the other station (ON) AF in the memory during the AF search of the current receiving station (own station), and turns ON the large S meter level read from the memory during the ON AF search. Because we are doing a search,
A quick and accurate ON AF search can be performed.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation and a processing procedure of an embodiment of an RDS receiver according to the present invention.

FIG. 2 is a block diagram showing a configuration of an RDS receiver according to the present invention.

FIG. 3 is a flowchart showing an operation and a processing procedure of a conventional RDS receiver.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front end 2 IF detector 3 Noise canceller 4 Multiplexer 5 Volume circuit 6 Mute circuit 7 Amplifier 8 Low-pass filter (LPF) 9 PLL circuit 10 System microcomputer 11 RDS demodulator 12 Synchronous microcomputer

Claims (1)

(57) [Scope of request for utility model registration] 1. An apparatus for receiving RDS data including similar station (AF) data and EON data related to another station (ON),
In an RDS receiver for automatically switching to a station having a better reception state and automatically switching to a traffic information station by an AF search based on F data, an AF list of EON data relating to the other station during the AF search operation An RDS receiver comprising: means for measuring the reception state of the EON AF and storing it in a memory; and means for searching the EON AF list in order of the reception state based on the contents stored in the memory.