JPH0440021A - Broadcasting program tracking type receiver - Google Patents

Abstract

PURPOSE:To receive a broadcasting program while automatically tracking it by previously storing the frequency information of a network station to be optimumly received in a ROM table to be referred to by a traveling distance. CONSTITUTION:A ROM table 14 is provided to previously store the frequency information of network stations 3a and 3b to be optimumly received in respective areas while dividing the areas from the starting point to the ending point of a route by distances, and a controller 13 is provided to access the ROM table 14 according to the data of the distance from the starting point obtained by the traveling distance measuring means of a traveling object 1. Then, a tuner 12 is provided to automatically set a receiving frequency according to the frequency information read out from the ROM table 14. Thus, the broadcasting program tracking type receiver to be mounted on the long-distance traveling object 1 can automatically receive from the network stations, from which broadcasting can be received at optimum in the traveling areas, with simple configuration.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to enable automatic reception of network stations that can be optimally received in the area in which the vehicle is traveling, with a simple configuration, regarding a broadcast program tracking type receiving device installed in a long-distance moving object. , a broadcast program tracking type receiving device mounted on a long-distance moving object traveling on a predetermined route, which divides the route from the start point to the end point by distance and selects network station frequencies that can be optimally received in each region. R that stores information in advance
an OM table, a controller that accesses the ROM table using distance data from a starting point obtained by the distance measuring means of the moving object, and a tuner that automatically sets a receiving frequency based on frequency information successively obtained from the ROM table. It is configured to have the following.

[Industrial application field]

The present invention relates to a broadcast program tracking type receiving device mounted on a long-distance moving object.

A service that receives radio and television broadcasts on trains such as the Shinkansen and broadcasts them to passenger seats is useful for entertaining passengers traveling long distances and for gathering information.

[Conventional technology]

For example, when receiving FM broadcasts on a long-distance moving object such as a train that travels hundreds of times, there is a limit to the distance that can be traveled without detuning at the frequency tuned at the starting point, and how many distances can be traveled by the end point. You need to re-synchronize again. When automating this synchronization, it is important to maintain the sameness of broadcast programs in order to improve the quality of the service.

Multiple broadcast stations that broadcast the same program are called network stations. In RDS (Radio Data System) broadcasting, a part of the broadcast signal includes a program code indicating the broadcast content, so even if the driving area changes, it is possible to easily search for a network station with the same broadcast content.

[Problem to be solved by the invention]

However, in areas where RDS broadcasting is not implemented, the benefits cannot be utilized, and even if RDS broadcasting is implemented, the configuration of the receiving device is complicated and expensive.

The present invention enables a long-distance moving object to automatically receive network stations that can be optimally received in the area in which the object is traveling with a simple configuration.

[Means to solve the problem]

FIG. 1 is a system configuration diagram of the present invention, where 1 is a moving body, 2 is a track (determined route), and 3a, 3b.

. . . are a plurality of network stations.

[Effect]

Assuming that the network stations 3a, 3b, . There must be. However, if you stay tuned to fl forever, you will eventually lose tune, so next you need to tune back to the broadcast frequency f of the network station 3b.

Which of the stations 3a and 3b should be tuned to by the receiver of the mobile body 1 depends on the current position of the mobile body 1. In the present invention, this current position is determined by the distance traveled from the starting point. In addition, a ROM table (described later) is prepared that can be referred to based on the mileage, and frequency information of network stations that can be optimally received for each region is stored in advance in the ROM table (described later). In this way, even if the network station changes as the mobile unit 1 moves, it can be automatically tracked and received, and there is no need for a complicated configuration such as an RDS receiver.

〔Example〕

FIG. 2 is a block diagram showing one embodiment of the present invention. In the figure, 10 is a receiving device, 11 is an antenna, 12 is a tuner, 13 is a controller using a microcomputer, and 14 is an R that stores frequency information of network stations by mileage.
This is an OM table.

The tuner 12 is, for example, an electronic tuning type, and the tuning frequency can be varied by changing the frequency division ratio (N value) in a PLL (phase locked loop). The controller 13 can change this N value in manual mode or search mode, but here the part that changes it based on the frequency information read from the ROM table 14 (directly using the N value if it is stored) Explain. This access to the ROM table 14 uses distance data from the starting point obtained by the travel distance measuring means of the moving body 1. This distance data is expressed in units of 1, for example, and is highly accurate because it is corrected by signposts or the like during the journey.

The table below shows an example of data in the ROM table 14.

Table 1 The programs in the table above only show channel FM1 for NHK, but there are also channels FM2 and FM2 for commercial broadcasters.
There is FM3. These channels FMI~FM3 are 3
The messages are received by dedicated receivers, and passengers can select one and listen to it using earphones. The distance in kilometers is expressed as an absolute distance from the starting point, and the distance data for the outbound trip increases from OKm (starting point), and the distance data for the return trip decreases from 497 Km (end point).

Using the ROM table in Table 1, 82.5 MHz (NHK Tokyo) is received from the starting point (OKm) to aK-, and when it exceeds aKm, it switches to 85.1 MHz (NHK Urawa). This is the case on the outward journey, and in the case of the return journey, 85.1 MHz is received until al[- approaches the starting point, and when it comes within one to a, it switches to 82.5 MH2.

Switch in other areas similarly with -, c, d, e, fK-.

The frequency information in the ROM table 14 includes not only the N value for tuning, but also broadcast frequencies and broadcast station names, which are used for display.

FIG. 3 is a schematic flowchart showing part of the processing performed by the control unit 13. This process is carried out periodically (e.g. 250 m5
In the first step S1, distance data is captured. In the next step S2, the ROM table 14 is accessed using the captured distance data, and the read N value is output to the tuner 12 in step S3.

Note that in some areas, it may not be possible to receive any network stations. In this case, you can perform processing such as switching to another broadcast program, muting the program, or switching to another source.

〔Effect of the invention〕

As described above, according to the present invention, there is an advantage that network stations can be tracked with a simple configuration in a long-distance moving body such as a train.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of the present invention, and FIGS. 2 and 3 are a configuration diagram and a flowchart showing an embodiment of the present invention. 10 is a receiving device, 11 is an antenna, 12 is a tuner, 13 is a controller, and 14 is a ROM table. Applicant Fujitsu Ten Ltd.

Claims (1)

[Claims] 1. A long-distance moving object (
1) is a broadcast program tracking type receiving device installed in 1), which divides the route from the start point to the end point by distance and stores in advance frequency information of network stations (3) that can be optimally received in each region. a ROM table (14); a controller (13) that accesses the ROM table using distance data from the starting point obtained by the distance measuring means of the moving body; What is claimed is: 1. A broadcast program tracking type receiving device comprising: a tuner (12) that is automatically set;