JPH1013753A - On-vehicle television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive other channel broadcast automatically making the same broadcast with an excellent reception state when an electric field strength of a broadcast frequency during reception is weaken and excellent reception is disable while a vehicle is driven. SOLUTION: The service area of a television broadcast station is stored in a service area data storage device 19 in advance, the current position of a vehicle is detected by a vehicle position detector 18, a control section 17 checks reception states of all channel broadcast programs sending the same broadcast program within the service area at the current position and selects and receives a channel broadcast program whose reception state is excellent based on the result of discrimination, then the vehicle always receives the channel broadcast whose reception state is excellent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle television receiver installed and used in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, in the vicinity of a service area of a VHF station, a broadcast of a VHF station is converted into a UHF station and transmitted. For example, in the suburbs of Tokyo, there are UHF stations such as Tama station and landmark station. As described above, in the area where the VHF station and the UHF station overlap, the same program is transmitted to the VHF station and the UHF station.
Reception can be performed on two different frequencies of the station.
With conventional in-vehicle television receivers, when the electric field intensity of the broadcast frequency being received becomes weak during traveling of the vehicle and good reception is no longer possible, continue to receive as it is, or manually operate by the user Had switched to another broadcast station.

[0003]

However, in the above-mentioned conventional on-vehicle television receiver, it is possible to detect the deterioration of the reception state by the output of the signal meter, but it is also possible to detect other VHF stations transmitting the same broadcast. Alternatively, since the presence of the UHF station is not known to the user, it has been necessary to switch to another broadcasting station by manual operation by the user.

[0004] In addition, if the user himself does not know the existence of another broadcasting station transmitting the same broadcast content, he cannot switch the broadcasting station.

The present invention solves the above-mentioned conventional problem. When the electric field intensity of a broadcast frequency being received becomes weak during traveling of a vehicle and good reception becomes impossible, the same program is transmitted. It is an object of the present invention to provide an excellent in-vehicle television receiver that can always receive a channel broadcast having a good reception state in an area where another channel broadcast is present.

[0006]

According to the present invention, in order to achieve the above object, a service area of a television broadcasting station is stored in advance, and a current position of the vehicle is detected. In this method, the reception states of all the channel broadcasts transmitting the same broadcast content are determined, and a channel broadcast having a good reception state is selected and received based on the determination result.

[0007] Thus, it is possible to always receive a channel broadcast having a good reception condition among channel broadcasts transmitting the same broadcast content in a service area where the vehicle is running.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION
Storage means for storing a service area of a television broadcasting station;
Vehicle position detecting means for detecting a running position of the vehicle, and reception states of all channel broadcasts transmitting the same broadcast content in the service area at the current position of the vehicle based on the service area data stored in the storage means And a control means for selecting and receiving a channel broadcast having a good reception state while the vehicle is running, based on the determination result of the determination means, and Thus, it is possible to always receive a channel broadcast having a good reception state among channel broadcasts transmitting the same broadcast.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
And FIG. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of an on-vehicle television receiver according to the present embodiment. In FIG. 1, 1 is an antenna capable of receiving a VHF band radio wave and a UHF band radio wave, 2 is a tuner, 3 is a filter, 4 is a video intermediate frequency amplifier, 5 is a video detector 6, PLL is a filter, 7 is a filter, and 8 is a filter. The audio intermediate frequency amplifier 9 is an audio detector. As described above, the reception block 10 of the PLL frequency synthesizer system that receives broadcast frequency data by receiving broadcast frequency data is configured.

Reference numeral 11 denotes a signal meter indicating the electric field strength of the received channel, and reference numeral 12 denotes a synchronization detector for detecting a synchronization signal of the video signal output from the video detector 5. 13
Is a monitor for displaying a video signal, 14 is an MPX circuit, 1
Reference numeral 5 denotes an amplifier for amplifying the audio signal output from the MPX circuit 14, and reference numeral 16 denotes a speaker for outputting the amplified audio signal.

Reference numeral 17 denotes a control unit for switching a channel to be received according to the output of the signal meter 11. Reference numeral 18 denotes a vehicle position detector. The vehicle position detector 18 detects a current position of the vehicle based on a signal relating to position information from a GPS antenna, for example. Reference numeral 19 denotes service area data storage means.
Stores the service areas of all TV broadcasting stations together with the position information of the service areas.

Next, the operation of the in-vehicle television receiver configured as described above will be described with reference to FIG. 1 and FIG. 2 showing an operation flow of the control unit 17.

In a running vehicle, when the electric field strength of a TV broadcast being received is weakened and the reception state is deteriorated, the output of the signal meter 11 indicating the electric field strength is reduced. When the output of the signal meter 11 decreases and falls below a predetermined value (YES in step S2), the current position of the vehicle detected by the vehicle position detector 18 is confirmed (step S3). From the stored data, it is searched whether there is a channel broadcast transmitting the same broadcast as the currently received channel (step S).
4). If there is no channel data of the same broadcast, the process returns to step S1 to continue receiving the same channel.

If there is a channel broadcast of the same broadcast, the channel data is output to the receiving block 10, and the output of the signal meter 11 indicating the electric field strength of the received channel broadcast is checked (step S5). When it is determined that the output of the signal meter 11 is equal to or more than a certain value (step S6), the receiving block 10 is switched to a channel broadcast that performs the same broadcast. Signal meter 1
If the output of No. 1 is below a certain value, it is searched whether there is another channel broadcast of the same broadcast (step S8), the output of the signal meter 11 is checked, and the output of the signal meter 11 is above a certain value. If there is a channel broadcast, the reception block 10 is switched to that channel broadcast in the same manner as described above.

As described above, according to the embodiment of the present invention, the service area of the television broadcasting station is stored in advance in the service area data storage means 19, the current position of the vehicle is detected by the vehicle position detector 18, and the vehicle position is detected. When the electric field intensity of the broadcast frequency being received becomes weak during traveling of the vehicle and the reception becomes poor, the output of the signal meter 11 is checked, and the reception block 10 is switched to the channel broadcast of the same broadcast. Accordingly, it is possible to always receive a channel broadcast having a good reception state.

[0016]

As described above, according to the present invention, the same broadcast content is transmitted within the service area at the current position of the vehicle by storing the service area of the television broadcasting station in advance and detecting the current position of the vehicle. The receiving state of all the channel broadcasts is determined, and the receiving state is selected and the channel broadcasting having a good receiving state is selected and received based on the determination result. In the area where there is another channel broadcasting transmitting the same program when the reception becomes weak and good reception is no longer possible, it has the effect of being able to always receive a good channel broadcast with good reception status. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an on-vehicle television receiver according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment.

[Explanation of symbols]

 Reference Signs List 9 sound detector 10 reception block 11 signal meter 12 synchronization detector 17 control unit 18 vehicle position detector 19 service area data storage device

Claims (1)

[Claims] 1. A storage means for storing a service area of a television broadcasting station, a vehicle position detection means for detecting a running position of a vehicle, and a service at a current position of the vehicle based on service area data stored in the storage means. Determining means for determining the reception state of all the channel broadcasts transmitting the same broadcast content in the area; and selecting and receiving a channel broadcast having a good reception state while the vehicle is running based on the determination result of the determination means. An on-vehicle television receiver comprising a control unit.