JPH03222590A - Television receiver for mounting on mobile body - Google Patents

Abstract

PURPOSE:To trace the same series broadcast station or the same network even when a reception broadcast station is change while a mobile body mount television receiver is moving by using an extraction section of a teletext broadcast and an SID broadcast table. CONSTITUTION:The above television receiver is provided with a teletext broadcast signal extraction means 7, a transmission identification number broadcast comparison data table 8, a synthesizer tuner 2, and a tuner microcomputer processing section 6. Then a teletext broadcast signal is extracted from a television broadcast signal and a number index data head included in the signal is detected and a transmission identification number (SID) is read and the area, the broadcast station and the channel are set to the synthesizer tuner 2 from the SID broadcast station table 8 based on the read data to set an object broadcast station. Thus, even when the mobile body is at the outside of the service area of the television broadcast station, the object broadcast station is sought in a short period.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a television receiver mounted on a mobile object that can receive teletext.

Conventional technology Nowadays, highway networks have developed and the performance of automobiles has improved.
The number of people who drive long distances and use long-distance bus rides is increasing, and the number of people who are using TV broadcasts in their cars is also increasing.

Conventionally, when using a TV broadcast while traveling in a car, it is rare for the same broadcast to be broadcast on the same channel when the user goes out of the service area of the broadcast station being received, and the user has to It was necessary to retune the corresponding broadcast station within that area.

Problems to be Solved by the Invention When using television broadcasting in a moving car,
If you go out of the service area of a TV broadcasting station, you will have to search again for another broadcasting station of the same affiliate. There were issues such as the amount of time it took to find the person.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention aims to provide a television receiver that can locate a target broadcasting station in a short time even when a mobile object moves out of the service area of a television broadcasting station.

Means for Solving the Problems The present invention is a teletext signal extraction method for reliably identifying a receiving broadcasting station and finding a target broadcasting station by determining the data content of teletext broadcasts already distributed nationwide by NHK etc. The apparatus includes means, a transmission identification number broadcasting station comparison data table, a synthesizer tuner, and a tuner microcomputer processing section.

According to the present invention, a teletext signal is extracted from a television broadcast signal using the above-described means, a program index data head (hereinafter referred to as PICI) included in the signal is detected, and the teletext signal is transmitted from among the program index data head (hereinafter referred to as PICI). The identification number (hereinafter referred to as SID) is read, and based on the data, the area, broadcast station, and channel are set in the synthesizer tuner from the SID broadcast station table to tune to the target broadcast station.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a television receiver mounted on a mobile object in an m-embodiment of the present invention.

In the figure, 1 is an on-vehicle antenna for capturing television radio waves. 2 is a synthesizer tuner for detecting a signal from the vehicle-mounted antenna 1. , 3 are VIP and SIF processing units for processing VrF signals and SIF signals from the output of the synthesizer tuner 2 and outputting video signals and audio signals.

4 is a CRT display section for displaying video signals. 5 is a speaker for producing sound from an audio signal. 6 instructs synthesizer tuner 2 to select music;
This is a tuner microcomputer processing unit that adjusts video and audio signals. 7 is a teletext extraction unit for extracting H in the vertical blanking period in which teletext is superimposed from the video signal from the VIP and SJF processing unit 3, detecting PICT, and detecting STD in the background. be.

Reference numeral 8 denotes an SID broadcast station table having a correspondence data table of the SID code detected by the teletext sampling unit 7, the area of the broadcast station, the station name, and the channel. Reference numeral 9 denotes a key manual I/F unit which serves as an interface for the user to issue instructions such as chaff 2, volume selection, volume selection, etc.

The mobile vehicle-mounted television receiver configured as described above receives television radio waves using the vehicle-mounted antenna 1. The received television radio waves are detected by a synthesizer tuner 2, set by a manual T/F section 9, and processed by a tuner microcomputer processing section 6 to select a recognized broadcasting station.

VIF, 5IF (711) from synthesizer tuner 2
Each signal is processed by the VIP and SIF processing unit 3, and the CRT (
Display section) 4. Video and audio are output from the speaker 5.

At this time, the teletext extraction section 7 extracts the teletext signal from the video signal output from the VrF and SIF processing section 3, detects PICI from the teletext signal, and extracts the SID code.

The retrieved SID code is sent to the tuner microcomputer processing unit 6.
The broadcasting station name, channel, and prefecture color of the broadcasting station currently being received are identified and compared from the SID broadcasting station table 8.

When a mobile television receiver approaches a prefectural border, the following situations may occur: 1) the reception level drops below a reference value; 2) the SID of the same channel changes.

In the case of 1), the tuner microcomputer processing unit 6 determines the nearest broadcasting station based on the SID that has been received up to now, switches channels sequentially, and detects the corresponding 5 IDs (the same broadcasting station, for example, NHK, or the same network). Then, the receiving station of the synthesizer tuner 2 is fixed to that channel.

Similarly, in case 2), the tuner microcomputer processing unit 6 determines the nearest broadcasting station based on the SID that has been received so far, switches channels sequentially, and when the corresponding SID is detected, the synthesizer tuner 2 receives the signal on that channel. Fix the station.

Effects of the Invention As described above, according to the present invention, the teletext extraction part and the S
By using the ID broadcast station table, even if the receiving broadcast station changes while the mobile TV is moving, the receiving broadcast station can automatically follow the same affiliated broadcast station or the same network. You can get a cool effect by scratching.

In the description of the present invention, one vehicle-mounted antenna is used, but it goes without saying that the present invention also includes a case where a die-cut antenna is used.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a mobile-mounted television receiver in one embodiment of the present invention. 1... Vehicle antenna, 2... Synthesizer tuner, 3... VIF, SIF processing section,
4...CRT, 5...Speaker, 6...
...Tuner microcomputer processing section, 7...Teletext extraction section, 8...SID broadcast station table, 9
...Key human resources department.

Claims (1)

[Claims] A television broadcast receiving circuit including a teletext sampling circuit is provided, and means is provided for extracting teletext data from the teletext sampling circuit, detecting a program index data header, and determining a transmission identification number included in the data. Based on the output, the service area, the applicable broadcasting station, and its channel are immediately determined from the transmission identification number table in the receiving circuit, and the broadcasting station being received within the mobile object or the network series of the broadcasting station is maintained constant. Television receiver for mounting on mobile objects.