JPH04126415A - Traffic information reception method for rds receiver - Google Patents

Abstract

PURPOSE:To allow a driver to drive its vehicle with safety without feeling irritation by referencing a TP data so as to seek a traffic information broadcast station when broadcast of traffic information is requested and obtaining a broadcast station broadcasting the traffic information in future closest from a current time and displaying the time up to the broadcast. CONSTITUTION:A data representing a succeeding traffic information broadcast time is sent in addition to a TP data (identification data representing a broadcast station broadcasting traffic information) and a TA data (identification data representing it that traffic information is broadcasting) from a broadcast station broadcasting traffic information while being superimposed on an FM broadcast signal). When a traffic information reception key 14a is turned on, a controller 13 makes seeking for each prescribed time so as not to give effect on the reception of a current FM broadcast and references the presence of the TP data to search a traffic information broadcast station. Then the broadcast station broadcasting the traffic information in future closest to a current time is obtained and a broadcast time or a time up to the broadcast time is displayed on a display section 15.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for receiving traffic information using an RDS receiver, and particularly to a method for broadcasting traffic information by displaying the earliest traffic information broadcast time or the time up to that time. The present invention relates to a method for receiving traffic information.

<Prior Art> In addition to being able to easily obtain traffic information, car radios are required to have sophisticated single-channel selection functions. For this reason,
RDS (Radio Data System) has been proposed and put into practical use by the European Broadcasting Union. This RDS is F
It is a method that superimposes various digital data on the M radio broadcast signal, and the message is the FM radio currently being received.
(i) Program identification code (PI code) of broadcasting (i)
i) Broadcasting station name (ps) (iii) Broadcasting station frequency list (AF
) (iv) Program content identification code (PTY) (V) Transmission status identification code (DI) (vi) Music or conversation identification code (M/S code) and (vii) Traffic information broadcasting station identification code ( TP) (Vl
l) There is an identification code (TA) etc. during traffic information broadcast.

In this way, with RDS, messages and traffic information related to the FM broadcasts being received are transmitted multiplexed, so the messages can be used to perform unprecedented channel selection operations and traffic information reception operations.

For example, if you turn on the traffic information reception switch, even if you are listening to an FM broadcast, it will automatically identify whether traffic information is being broadcast based on the TA data sent superimposed on the FM signal. It is possible to interrupt FM broadcasting and receive traffic information.

Also, even if a tape deck or CD is playing, if it is identified based on TA data that traffic information is being broadcast, the tape mode or CD mode will be temporarily switched to FM reception mode and the traffic information will be broadcast. (Problem to be solved by the invention) Normally, the time slot for broadcasting traffic information is fixed, but the broadcast time varies depending on the broadcasting station. There may be cases where For this reason, if you miss the latest traffic information, even if you tune in to listen to traffic information from another station, that station has already finished broadcasting the traffic information.

I don't know if it will be broadcast soon, and I end up waiting a long time before I can hear the traffic information. Furthermore, if you miss the latest traffic information, it is troublesome to tune the channels one by one to listen to the traffic information, and there is also the problem of poor operability.

From the above, an object of the present invention is to provide an RDS system that allows you to reliably listen to traffic information that will be broadcast sooner in the future among receivable broadcast stations.
An object of the present invention is to provide a method for receiving traffic information by a receiver.

Another object of the present invention is to provide a traffic information receiving method for an RDS receiver that can display the broadcast time of traffic information that will be broadcast earlier in the future among receivable broadcast stations or the time up to that time. It is.

<Means for Solving the Problems> The present invention solves the above problems by requiring a means for seeking a traffic information broadcasting station by referring to TP data, and a correspondence between the traffic information broadcasting station and the traffic information broadcasting time. means for determining a broadcasting station that will broadcast traffic information in the nearest future than the time; means for displaying the broadcast time or the time until the broadcast;
This is accomplished by means of broadcasting traffic information at the specified time or when TA data is detected.

<Function> In addition to identification data (TP data) indicating that the station is broadcasting traffic information and identification data (TA data) indicating that traffic information is being broadcast, the FM broadcast signal includes traffic information. Data indicating broadcast time is superimposed, and when the broadcast of traffic information is requested, the traffic information broadcasting station is sought by referring to the TP data, the correspondence between the traffic information broadcasting station and the traffic information broadcasting time is determined, and the seek is performed. After that, jJ! Find the broadcasting station that will broadcast traffic information in the nearest future from the time, display the broadcasting time or the time up to the broadcasting time, and when the time comes or TA data is detected, the broadcasting station will broadcast traffic information from the broadcasting station. Broadcast traffic information sent to you.

As a result, for example, by simply turning on the traffic information reception switch, you can reliably listen to traffic information that will be broadcast sooner in the future among receivable broadcast stations, and also be able to listen to traffic information that will be broadcast earlier in the future among receivable broadcast stations. The broadcast time of traffic information or the time up to that time can be displayed, allowing drivers to drive with peace of mind.

<Embodiment> FIG.
FIG. 2 is a block diagram of main parts of a DS receiver.

1 is an antenna, 2 is a front end, and P
Based on the voltage signal output from the LL circuit, an intermediate frequency signal is generated in tune with a predetermined broadcasting station. 3 is an intermediate frequency amplifier, which amplifies the intermediate frequency signal converted by the front end 2.

A stereo demodulation circuit (MPX) 4 demodulates the intermediate frequency signal input from the intermediate frequency amplifier 3 into a stereo signal. 5 is a mute circuit, 6 is an amplifier (AMP), 7
is a speaker, which is operated by an amplifier 6 to output sound.

8 is a 57 KHz band pass filter (BPF) that passes a 57 KHz subcarrier that is amplitude modulated based on RDS data. Reference numeral 9 denotes an RDS decoder/clock regeneration circuit, which demodulates RDS data from the output of a bandpass filter and regenerates a clock. A group synchronization/error detection/correction circuit 10 detects errors in the RDS data demodulated by the RDS decoder/clock recovery circuit 9 while synchronizing each group, and corrects the errors.

Reference numeral 11 denotes a signal meter, which detects the reception level (reception electric field strength) of the receiving station by monitoring the signal strength of the intermediate frequency signal output from the intermediate frequency amplifier 3. 1
3 is a station detector, which determines that a receiving station exists (station present) when it is within the range of the frequency deviation Δf (bandwidth) of the received signal and the signal strength is above a set level. .

13 is a microcomputer-configured controller that performs automatic tracking processing and traffic information reception processing to be described later based on RDS data, received electric field strength Lb, station detect signal SD, etc., 14 is an operation section, 15 is a display section, and 16 is a controller from the controller. This is a PLL circuit that inputs a voltage signal corresponding to input reception frequency data FDT to the front end 2 and tunes it to a predetermined broadcast station. Note that 14a is a traffic information reception key that puts the RDS receiver into a traffic information reception state.

The traffic information receiving process of the RDS receiver of FIG. 1 will be explained below according to the flowchart of FIG. 2. Furthermore, from broadcasting stations that broadcast traffic information, TP data (
In addition to identification data indicating that the station is broadcasting traffic information) and TA data (identification data indicating that the station is currently broadcasting traffic information), data indicating the next traffic information broadcast time will be sent. It has become.

When the traffic information reception key 14a is turned on, the RDS receiver enters the traffic information reception mode. In the traffic information reception mode, the controller 13 performs a seek operation at predetermined time intervals so as not to affect the reception of the current FM broadcast, and searches for a traffic information broadcast station by referring to the presence or absence of TP data (step 101). Then, a correspondence table between traffic information broadcast stations and traffic information broadcast times is created over the entire receiving frequency range and stored in the built-in memory 13a (step 1).
02).

Thereafter, the broadcasting station that will broadcast traffic information in the near future from the current time is determined from the correspondence table (step 103).
), the broadcast time of the traffic information or the time until the broadcast time is displayed on the display section 15 (step 104).The time until the broadcast time is updated and displayed as time passes.

Thereafter, the controller 13 checks whether TA data is being sent from the broadcasting station determined in step 103 (step 10).
5) When TA data is detected (in other words, when the determined broadcast time has arrived), the FM broadcast is automatically interrupted and traffic information from the broadcast station is received (step 106).

When the traffic information broadcast ends, the process returns to receiving the FM broadcast of the original broadcast station, and the above process is repeated thereafter.

Although traffic information is received by detecting TA data in the above example, it is also possible to monitor whether the broadcast time has arrived and receive traffic information when the broadcast time has arrived.

<Effects of the Invention> According to the present invention, when it is requested to superimpose the data indicating the broadcast time of traffic information on the FM broadcast signal and broadcast the traffic information, the traffic information broadcasting station refers to the TP data. The system searches for the broadcast station that will broadcast traffic information in the nearest future from the current time, displays the broadcast time or the time until broadcast, and broadcasts the traffic information at the specified time. It is possible to reliably listen to the traffic information that will be broadcast earliest in the future among receivable broadcast stations, and also to display the broadcast time of the traffic information or the time up to that point.
Drivers can drive with peace of mind without getting irritated.

[Brief explanation of drawings]

FIG. 1 shows R that executes traffic information reception processing according to the present invention.
A block diagram of the DS receiver. FIG. 2 is a flowchart of the traffic information reception process of the present invention. 9 ・ ・ 10 ・ 13 ・ 4a 15 ・ RDS decoder・Clock regeneration circuit・Group synchronization・Error detection/correction circuit Controller・・Traffic information reception key・Display section

Claims (1)

[Scope of Claims] A traffic information receiving method for an RDS receiver that demodulates RDS data sent superimposed on an FM broadcast signal and performs a predetermined operation, comprising: a broadcasting station that broadcasts traffic information on an FM broadcast signal; In addition to the identification data (TP data) indicating that traffic information is being broadcast and the identification data (TA data) indicating that traffic information is being broadcast, data indicating the next traffic information broadcast time is superimposed, and traffic information is broadcast. When requested, seek the traffic information broadcasting station by referring to the TP data, find the broadcasting station that will broadcast traffic information in the nearest future from the traffic information broadcasting time of the traffic information broadcasting station, and search for the broadcasting station that will broadcast traffic information in the nearest future from the traffic information broadcasting time of the traffic information broadcasting station. A method for receiving traffic information using an RDS receiver, characterized in that the time is displayed and traffic information is broadcast when the time reaches the time or when TA data is detected.