JP2001285101A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily receive the same program even if a receiver is dislocated from a present reception area. SOLUTION: When present position information is received from a car navigation system 2, a digital broadcast receiver 1 on a mobile object 1 compares reception range information which is previously stored in a memory 18 with present position information, searches a broadcast station in a reception possible range within the memory and performs an operation for searching the program which was being received just before.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver such as a terrestrial digital broadcast receiver.

[0002]

2. Description of the Related Art In terrestrial digital broadcasting in which commercial broadcasting is about to start, a transmission system called OFDM is adopted. Such a transmission method is resistant to ghost, and it is assumed that a digital broadcast receiver is used in a mobile body such as an automobile.

[0003]

However, as the mobile moves, the mobile terminal moves out of the receiving area of the frequency of the channel currently being received, so that a signal cannot be received. At this time, a message indicating that reception is not possible is displayed on the screen to enable the user to select a channel, but in that case, it takes time to select the channel. There is.

[0004] In view of the above circumstances, an object of the present invention is to make it possible to easily receive the same program even if the user goes out of the current reception area.

[0005]

According to the first aspect of the present invention, there is provided a digital broadcast receiver for receiving a terrestrial digital broadcast at a mobile unit, comprising: a navigation system;
Upon detecting a decrease in the current reception level, a broadcast station search means for searching for a receivable broadcast station from the current location information obtained by the navigation system, and a broadcast station searched by the broadcast station search means is received until immediately before. And a determination means for determining whether or not the program being performed exists.

According to a second aspect of the present invention, in the digital broadcast receiver according to the first aspect, the search for the same program is performed by detecting a program name in the program information.

A third aspect of the present invention is the digital broadcast receiver according to the first aspect, wherein the broadcast station search means searches for a receivable broadcast station from current position information and data in a memory.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of a system according to the present invention. A terrestrial digital broadcast signal caught by an antenna 3 is received by a terrestrial digital broadcast receiver 1 and its image is displayed on a monitor 5. Is done.

On the other hand, the GP received by the GPS antenna 4
The S signal is supplied to the car navigation system 2, and the monitor 2 displays position information.

The digital terrestrial broadcasting receiver 1 and the car navigation system are connected by a cable using an external interface 19.

The digital broadcast receiver 1 previously stores frequency data capable of receiving broadcasts from existing broadcasting stations, and has a function of notifying the car navigation system 2 of the current position coordinates and the status thereof. It is assumed that

FIG. 2 is a block diagram of the digital broadcast receiver 1. A digital broadcast reception signal caught by an antenna 6 is selected by a tuner 7.

Reference numeral 8 denotes a DEMUX circuit, which is a tuner 7
, And classifies them into video signals, audio signals, program information, and the like.

MPEG output from the DEMUX circuit 8
The video / audio signal in the format is decoded by the AV decoder 9, and the decoded audio signal is sent to the audio processing circuit 1.
0, output from the speaker 20 via the audio output circuit 11. On the other hand, the video signal is supplied to a CRT (monitor) 5 via a video processing circuit 12 and a video output circuit 13.

Program information as additional information obtained from the DEMUX circuit 8 includes channel selection information and an electronic program guide (EP).
G) can be obtained by the system controller 16 as the information on which G) is based. The EPG is displayed by driving the OSD display circuit 17 according to an instruction from the system controller 16 and sending a signal to be superimposed to the video processing circuit 12. Of course, as the OSD display, not only the EPG but also various displays such as message information, channel display, and volume display are performed.

A user's IR remote control transmitter (not shown)
Is received by the remote control light receiver 14 and the remote control signal is supplied to the system controller 16.
Reference numeral 18 denotes a memory, which stores names of all existing broadcasting stations, reception range information for receiving the broadcast, and frequency information of signals broadcast by the broadcast in this embodiment.
Of course, various data including channel selection and EPG data may be stored in the memory 18.

Next, the operation of the present system will be described with reference to the flowchart of FIG.

The system controller 16 includes the tuner 7
(S1), the vehicle equipped with the system leaves the reception area where a certain channel has been received, and the reception level decreases. When the reception is disabled, the OSD function is used to display on the screen a message describing that the reception is disabled (reception failure has occurred) (S2). Then, the system controller 16 requests the current position coordinates and the current position state from the car navigation system 2 through the external input / output interface 19 (S3).

When the car navigation system receives this request (S4), the map data and the GPS antenna 4
The state of the current position is determined based on the reception state of (1), and the current position coordinates and the current position state are returned to the digital broadcast receiver 1 (S5). That is, steps 4 and 5
Is a processing operation on the car navigation system side.

When receiving the current position information from the car navigation system (S6), the digital broadcast receiver 1
Compares the reception range information stored in the memory 18 with the current position information, and searches the memory for a broadcasting station within the receivable range (S7).

Next, it is determined whether or not there is a broadcasting station that has been received immediately before in the receivable broadcasting stations (S8). If any of the receivable stations is a station that has just been received,
A message to that effect is displayed on the screen by the OSD, and waits until reception becomes possible (S9).

If it is determined in step 8 that there is no broadcast station that has been received immediately before in the receivable broadcast station, then a broadcast station of the same series as the broadcast station that has been received immediately before is found in the receivable broadcast station. It is determined whether or not there is (S1
0) If it is determined that there is an affiliated station, the tuner 7 is controlled to select the affiliated station and acquire program information (S11). The system controller 16 checks the program information to determine whether or not there is a program that was received by the digital receiver immediately before (S13). (S16). If the program received until immediately before does not exist, a display indicating that the program does not exist is displayed (S1).
7).

In step 10 (S10), if there is no station in the receivable broadcasting station that is the same affiliated station as the one just received, the program selects a broadcasting station in the receivable broadcasting station and acquires program information (S12). ). The system controller 16 looks at the program information and determines whether or not there is a program which the digital receiver has received immediately before (S10).
14) If there is a program which has been received immediately before, a broadcast station broadcasting the program is selected (S15), and the program is displayed as it is (S16). If the program received until immediately before does not exist, a display indicating that the program does not exist is displayed (S17).

[0025]

According to the present invention, even if the receiver deviates from the current reception area due to the movement of the moving body, the receiver automatically follows and performs the reception operation. You can watch the same program without any interruption. In addition, since channel selection is performed based on the information stored in the memory, there is no need to perform a channel search, and quick automatic channel selection becomes possible. Furthermore, it is possible to give a sense of security to the user by presenting the cause of a reception failure caused by a tunnel or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an entire reception control device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a main part of the reception control device according to the embodiment of the present invention;

FIG. 3 is a diagram for explaining an operation of the reception control device according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 digital broadcast receiver 2 car navigation system 3 antenna 4 GPS antenna 5 monitor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 5/44 H04N 5/44 Z 9A001 5/445 5/445 Z 7/025 7/08 A 7/03 7/035 F term (reference) 2F029 AA02 AB07 5C025 AA23 AA29 BA27 BA30 CA09 CA18 CB07 DA07 5C063 AB03 AC01 AC05 CA11 EB31 EB33 EB46 5H180 BB04 EE18 FF05 5K061 AA03 BB06 BB07 BB17 FF17 JJ01 FF17 FF01 FF01 5 JJ78 KK56

Claims (3)

[Claims] A digital broadcast receiver for receiving a terrestrial digital broadcast at a mobile object, comprising: a navigation system; and detecting a decrease in the current reception level to search for a receivable broadcast station from current location information obtained by the navigation system. A digital broadcast receiver comprising: a broadcast station search unit that performs a search; and a determination unit that receives a broadcast station searched by the broadcast station search unit and determines whether a program that has been received immediately before exists. 2. The digital broadcast receiver according to claim 1, wherein a search for the same program is performed by detecting a program name in program information. 3. The digital broadcast receiver according to claim 1, wherein said broadcast station search means searches for a receivable broadcast station from current position information and data in a memory.