JP2002176591A - On-vehicle television set, and device and method for receiving broadcast signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide convenient on-vehicle television set, broadcast signal receiver and broadcast signal receiving method. SOLUTION: When the power is supplied to a microcomputer in a broadcasting area B, the microcomputer searches for a channel plan written in a RAM in a broadcasting area A, and when the microcomputer can not find a tuning frequency among three or more channels, the microcomputer performs auto memory operation and updates a channel plan in the broadcasting area B in the RAM. Thus, seek operation by a user becomes unnecessary, and the on- vehicle television set with high operability can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an in-vehicle television device, a broadcast signal receiving device, and a broadcast signal receiving method.

[0002]

2. Description of the Related Art In a conventional in-vehicle television apparatus, when a broadcast area changes while moving, a broadcast station transmits the current broadcast area using a tuning frequency corresponding to each channel of a channel plan set during a preset operation. Since the broadcast signal cannot be received, the user searches for a tuning frequency in the current broadcast area by a seek operation and updates the channel plan. Japanese Patent Laid-Open Publication No. Hei 7-226886 discloses an in-vehicle television device that executes a preset operation while considering that the reception level of the broadcast signal fluctuates during movement.

[0003]

In the above-mentioned conventional in-vehicle television apparatus, the user needs to update the channel plan every time the broadcasting area changes to correspond to the new broadcasting area, which is troublesome. It was not easy to use. The present invention has been made in view of the above problems, and has as its object to provide an in-vehicle television device, a broadcast signal receiving device, and a broadcast signal receiving method which are easy to use.

[0004]

According to a first aspect of the present invention, a broadcast signal transmitted from a broadcast station at a predetermined tuning frequency is received, converted to an intermediate frequency signal, and output. A PLL tuner, a chroma IC that receives an intermediate frequency signal output from the PLL tuner, executes predetermined signal processing, and outputs a video signal, a synchronization signal, and an audio signal; and a video signal output from the chroma IC. And a CRT for inputting a sync signal and outputting a video,
A speaker for inputting an audio signal output from the chroma IC and outputting an audio signal, and when the power is first turned on after installation, the channel assignment in the entire TV broadcast frequency band is set to R.
By reading from the OM and making the PLL tuner receive the broadcast signal at a tuning frequency corresponding to each channel, it is determined whether or not a tuning frequency has been assigned to each channel, and this tuning frequency has been assigned. A preset operation of extracting a channel and writing a channel plan to a RAM is executed. At the subsequent power-on, provided that a self-check mode is set, three or more channels of the channel plan written to the RAM are provided. If no tuning frequency has been assigned, the channel assignment in the entire TV broadcast frequency band is read from the ROM and the PLL tuner receives the broadcast signal at the tuning frequency corresponding to each channel, whereby the tuning frequency is assigned. Channel An automatic memory operation for extracting and overwriting the channel plan in the RAM is executed, and at the normal time, the broadcast signal is received by the PLL tuner at a tuning frequency corresponding to each channel of the channel plan, and an intermediate based on the broadcast signal is performed. The microcomputer includes a microcomputer that causes the chroma IC to execute the signal processing of the frequency signal, and an IIC bus that connects the PLL tuner, the chroma IC, and the microcomputer and carries data between the devices.

In the first aspect of the present invention, when the power is turned on for the first time after installation, the microcomputer reads out the channel assignments in the entire TV broadcast frequency band from the ROM and sets the tuning frequency corresponding to each channel to the tuning frequency. When the PLL tuner outputs reception instruction data to the PLL tuner via the IIC bus, the PLL tuner receives a broadcast signal transmitted from a broadcasting station at a tuning frequency,
The signal is converted to an intermediate frequency signal and output. At this time, the microcomputer determines whether or not a tuning frequency is assigned to each channel based on the intermediate frequency signal output from the PLL tuner via the IIC bus, and assigns the tuning frequency to the channel. A preset operation of extracting the specified channel and writing a channel plan in a predetermined broadcast area to the RAM is executed.

When the power is turned on thereafter, the microcomputer sets the tuning frequency corresponding to each channel of the channel plan written in the RAM in the current broadcast area on condition that the self-check mode is set. Check whether or not there is, if the tuning frequency is not assigned to three or more channels, it is determined that the current location is out of the predetermined broadcast area, and the channel assignment in the entire TV broadcast frequency band is determined. When the reception instruction data is output from the ROM via the IIC bus to the PLL tuner based on the tuning frequency corresponding to each channel, the PLL tuner transmits a broadcast signal transmitted from a broadcasting station at the tuning frequency. The signal is received, converted to an intermediate frequency signal, and output. At this time, the microcomputer extracts the channel to which the tuning frequency is assigned based on the intermediate frequency signal output from the PLL tuner via the IIC bus, and stores the channel plan in the current broadcasting area in the RAM. Execute the auto memory operation to overwrite.

Therefore, even if the microcomputer moves to another broadcasting area after the preset operation is completed,
By checking whether the channel plan written in M corresponds to the current broadcast area, the channel plan is maintained in a state suitable for the current broadcast area. This is useful in that a desired TV broadcast cannot be viewed because the channel plan that is not suitable for the current location is written in the RAM, and the user does not need to perform a troublesome operation such as a seek operation.

Further, at normal time, when the microcomputer outputs reception instruction data to the PLL tuner via the IIC bus based on the tuning frequency corresponding to each channel of the channel plan, the PLL tuner outputs the tuning frequency. Receives a broadcast signal transmitted from a broadcast station, converts the signal into an intermediate frequency signal, and outputs the signal. Then, Chroma IC
Based on the signal processing instruction data output from the microcomputer via the IIC bus, signal processing of the same intermediate frequency signal is executed, and a video signal, a synchronization signal, and an audio signal are output. For this reason, the CRT inputs the video signal and the synchronization signal output from the chroma IC and outputs the video, and the speaker inputs the audio signal output from the chroma IC and outputs the audio.

In the first aspect of the present invention, the broadcast signal receiving apparatus according to the present invention is realized as an in-vehicle television apparatus having a specific structure. It is also possible to capture a wide range of technologies. That is, the invention according to claim 2 is a broadcast signal receiving means for receiving a broadcast signal transmitted from a broadcast station, a channel group holding means for allocating the broadcast station to a channel and holding the broadcast station as a channel group, Means for determining whether or not the broadcast signal can be received based on a predetermined channel assigned by the channel group holding means, and means for not receiving the broadcast signal by the reception state determination means Channel group updating means for extracting a broadcast station corresponding to a broadcast signal receivable by the broadcast signal receiving means, allocating the extracted broadcast station to a channel, and updating the channel group. It is provided as a configuration.

[0010] In the invention according to claim 2 configured as described above, the channel group holding means allocates channels that can be received at the time of the preset operation and holds them as a channel group. The broadcast signal receiving means determines whether the broadcast signal transmitted from the broadcast station can be received based on the predetermined channel assigned by the channel group holding means. Here, the channel group updating means, when it is determined that the broadcast signal cannot be received by the reception status determining means, a broadcast station corresponding to a broadcast signal receivable by the broadcast signal receiving means in a current broadcast area. Then, the extracted broadcasting stations are assigned to channels, and the channel group is updated. Therefore, the broadcast area including the point at the time of the preset operation,
If the broadcast area including the current location is different, the channel group updating means updates the channel group, and sets the channel group held by the channel group holding means to be suitable for the current broadcast area.

The channel group updating means only needs to update the channel group when the broadcast signal cannot be received based on the predetermined channel allocated by the channel group holding means. As an example, in the invention according to claim 3, in the broadcast signal receiving apparatus according to claim 2, the channel group updating means cannot receive the broadcast signal on a predetermined number or more of channels by the reception status determination means. When it is determined that the broadcast signal is received by the broadcast signal receiving means, a broadcast station corresponding to a broadcast signal receivable is extracted, and the extracted broadcast station is allocated to a channel to update the channel group. In the invention according to claim 3 configured as described above, when the reception status determination unit determines that the broadcast signal cannot be received on a predetermined number or more channels, the channel group update unit performs the broadcast signal reception. The means extracts a broadcast station corresponding to a receivable broadcast signal, allocates the extracted broadcast station to a channel, and updates the channel group.

Therefore, when a part of the broadcast signals transmitted from the broadcast stations assigned to the channels included in the channel group cannot be received by the broadcast signal receiving means, the update of the channel group is not executed. Then
When in the same broadcast area as the preset operation, the reception environment of the broadcast signal temporarily deteriorates due to the shadow of an obstacle or the like, so that the broadcast allocated to some of the channels included in the above channel group is This is useful in that it is possible to prevent a case where a broadcast signal from a station cannot be received from being erroneously determined to have moved to another broadcast area.

[0013] The receiving condition determining means may determine whether or not the broadcast signal receiving means can receive the broadcast signal based on a predetermined channel allocated by the channel group holding means. A more convenient broadcast signal receiver can be realized by devising the timing of this determination. As an example, the invention according to claim 4 is the broadcast signal receiving device according to any one of claims 2 and 3, wherein the reception status determination means is configured such that the broadcast signal receiving means receives the broadcast signal. When possible, the broadcast signal receiving means determines whether or not the broadcast signal can be received based on a predetermined channel allocated by the channel group holding means. In the invention according to claim 4 configured as described above, when the broadcast signal receiving means enters a state in which the broadcast signal can be received, the reception status determining means determines that the broadcast signal receiving means is the channel group holding means. It is determined whether or not the broadcast signal can be received based on the predetermined channel assigned by.

As an example of the situation in which the broadcast signal receiving means can receive the broadcast signal, the invention according to claim 5 is the broadcast signal receiving apparatus according to claim 4, wherein , When the power is turned on,
The broadcast signal receiving means determines whether or not the broadcast signal can be received based on a predetermined channel allocated by the channel group holding means. In the invention according to claim 5 configured as described above,
When the power is turned on to the broadcast signal receiving device, the receiving state determining means can receive the broadcast signal based on a predetermined channel assigned by the broadcast signal receiving means by the channel group holding means. Is determined.

In this way, when the broadcast signal receiving apparatus is powered on, the reception status determining means makes the determination, so that it is easy to detect that the user has an intention to view the television broadcast. However, such a configuration is only an example. For example, the same determination operation is performed when the mode is switched from a video mode or a setting menu mode to a television mode for viewing television broadcasting. May be performed, or the same determination operation may be performed when a channel selection operation is performed by a channel selection operation. In the case of claims 4 and 5, the configuration is particularly effective when the user does not recognize the change in the broadcast area, but the user recognizes the change in the broadcast area and uses It is also possible to execute the above-described determination operation when the user himself performs a predetermined operation. As an example, the invention according to claim 6 is the broadcast signal receiving device according to any one of claim 2 or claim 3, wherein the reception status determination means includes operation reception means for receiving a predetermined operation, When the operation receiving unit receives the operation, the broadcast signal receiving unit determines whether the broadcast signal can be received based on a predetermined channel assigned by the channel group holding unit. .

In the invention according to the sixth aspect, when the operation receiving means receives a predetermined operation by the user, the reception status determining means determines that the broadcast signal receiving means has the channel group holding means. It is determined whether or not the broadcast signal can be received based on the predetermined channel assigned by. Then, since the determination operation can be executed only at a timing desired by the user, it is useful in that the updating of the channel group can be efficiently performed as necessary.

By the way, as described above, the method of detecting a change in the broadcast area and updating the channel group set at the time of the preset operation can be implemented not only as a substantial device but also as a method. It is feasible. As one example, the invention according to claim 7 assigns a channel to a broadcast station transmitting a broadcast signal to hold a channel group, and determines whether the broadcast station can receive the broadcast signal based on the assigned predetermined channel. If it is determined that the broadcast signal cannot be received,
In this configuration, a broadcast station corresponding to a broadcast signal receivable under the current situation is extracted, and the extracted broadcast station is assigned to a channel to update the channel group. That is, the configuration as the above device can be realized also as a method. It goes without saying that the configurations according to the third to sixth aspects can be similarly applied as a method.

[0018]

As described above, the present invention can provide a user-friendly in-vehicle television device.
Further, according to the second aspect of the present invention, it is possible to provide an easy-to-use broadcast signal receiving device. Further, according to the third aspect of the present invention, it is possible to prevent the channel group from being updated due to erroneous determination that the broadcast area has changed. Further, according to the fourth aspect of the invention, a more convenient broadcast signal receiving apparatus can be provided by devising the timing for determining whether or not the broadcast area has changed.

Further, according to the invention according to claim 5,
It is possible to easily detect that the user intends to view the television broadcast and determine whether or not the broadcast area has changed. Further, according to the invention according to claim 6,
Channel groups can be updated efficiently as needed. Further, according to the invention of claim 7, it is possible to provide an easy-to-use broadcast signal receiving method.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main configuration of an in-vehicle television device according to an embodiment of the present invention. In the figure, a PLL tuner 10
A local oscillation circuit 11, a reference crystal oscillator 12, and a phase comparator 13 are provided. The frequency obtained by dividing the local oscillation frequency output from the local oscillation circuit 11 and the reference crystal oscillation from the reference crystal oscillator 12 are provided. The frequency obtained by dividing the frequency is added to the phase comparator 13 to lock the loop.

The PLL tuner 10 is connected to the microcomputer 30 via the IIC bus 20. When receiving instruction data from the microcomputer 30, the PLL tuner 10 divides the local oscillation frequency according to the receiving instruction data. Since the ratio is changed, the local oscillation frequency can be adjusted to a tuning frequency corresponding to an arbitrary channel. Therefore, the PLL
The tuner 10 mixes the tuning frequency with the broadcast signal input from the antenna 10a and outputs a predetermined intermediate frequency signal. In this sense, the PLL tuner 10 constitutes a broadcast signal receiving unit according to the present invention. In addition, the chroma tuner 10 is connected to the PLL tuner 10 via the IIC bus 20.
The chroma IC 40 receives the intermediate frequency signal output from the PLL tuner 10,
Based on the signal processing instruction data output from the microcomputer 30, various signal processing is performed on the intermediate frequency signal to restore and output the video signal, synchronization signal, and audio signal. Then, C to which the video signal and the synchronization signal are inputted
At RT50, video output is performed, and at the speaker 60 to which the audio signal is input, audio output is performed.

The microcomputer 30 has a central processing unit (CPU) 31 and an RO in which a control program is written.
M32, a RAM 33 used as a work area at the time of arithmetic processing, and the like.
The control program is read out from the M32, the arithmetic processing is executed while appropriately using the RAM 33, and various control instruction data is output to the PLL tuner 10 and the chroma IC 40. Here, preset data such as a channel plan can be stored in the RAM 33 provided in the microcomputer 30. The CPU 31 writes the preset data in the RAM 33 during the preset operation, and writes the preset data as necessary. Is read and used for various controls.

Hereinafter, a channel plan as a channel group stored in the RAM 33 as a channel group holding means according to the present invention will be described. The tuning frequency is associated with the channel plan while corresponding to the channel. The channel here is 90MHz-7
A 70-MHz television broadcasting frequency band is assigned to channel numbers 1 to 62. Broadcasting stations in various locations transmit a broadcasting signal by setting a frequency so that channels do not overlap in a broadcasting area. . For example, FIG.
When the power supply of the vehicle-mounted television device is turned on for the first time after the installation in the broadcast area A shown in (1), the microcomputer 30 starts the preset operation of the channel plan. ROM3
1, the control program and the channel assignment in the entire TV broadcast frequency band are written. Therefore, the microcomputer outputs reception instruction data for each channel from channel “1” to channel “62” in order. It causes the PLL tuner 10 to execute a channel selection operation.

Then, in broadcast area A, channels "1", "3", "5", "9", "11", "2"
Since the broadcast stations respectively transmit the broadcast signals using the frequency bands corresponding to “5” and “35”, the microcomputer 3
0 indicates that these seven channels are assigned to the respective channel number buttons “1”, “2”, “3”, “4”, “5” arranged on the remote control transmitter 70 shown in FIG. 1 as shown in FIG. ,
The fact that the tuning frequency exists in each channel is written in the RAM 33 while corresponding to “6” and “7”, and the preset operation is completed. Here, when the vehicle equipped with the in-vehicle television device leaves the broadcast area A and enters another broadcast area B, in the broadcast area B, as shown in FIG. Different and different channel assignments have been made. For this reason, when moving to the broadcast area B, for example, even if the user presses down the channel number button “1” arranged on the remote control transmitter 70, the channel “1” assigned in the broadcast area A is Since there is no tuning frequency in the corresponding frequency band, a situation occurs in which the user cannot view video and audio based on the broadcast signal.

Therefore, in the present embodiment, in order to avoid such a situation, the microcomputer 30 is provided with a self-check function. FIG. 4 is a flowchart illustrating a procedure when the microcomputer 30 executes the self-check. That is, when the microcomputer 30 detects that the vehicle-mounted television device is powered on, it checks whether the self-check function is set.
Here, if the self-check function is set, R
A self-check of the channel plan written in the AM 33 is executed (steps S100, S110).
In the self-check referred to here, for a channel to which a tuning frequency is assigned, a broadcast signal is received at the tuning frequency corresponding to the channel number order.
The reception instruction data is output to the LL tuner 10.

For example, in broadcast area A in FIG.
Channels “1”, “3”, “5”, “9”, “1”
Tuning frequencies are assigned to “1”, “25”, and “35”. For this reason, the microcomputer 30 determines that each of the channels “3”, “5”,
For “9”, “11”, “25”, and “35”, it is determined whether a broadcast signal can be received at the corresponding tuning frequency. In this sense, the microcomputer 30 constitutes a reception status determination unit according to the present invention. When the in-vehicle television device is in the broadcast area A, since the broadcast signal can be received at the tuning frequency for all seven channels, the microcomputer 30 determines that the channel plan written in the RAM 33 is the current broadcast area. After confirming that the channel corresponds to A, a normal channel selection operation can be performed (steps S120 and S130). At this time, the microcomputer 30
It is only necessary to check the reception status using only seven tuning frequencies.
Since it is not necessary to confirm whether or not a tuning frequency exists in each of the channels # 62 to # 62, this is a useful technique in that a channel plan can be easily checked.

If the in-vehicle television device is located in the broadcast area A, it should be possible to receive the broadcast signal with the tuning frequency for all seven channels. If the signal receiving environment is not good, there is a possibility that a broadcast signal cannot be received at a tuning frequency corresponding to some channels. For this reason, in step S120, a condition is set such that the auto memory operation is executed only when a broadcast signal cannot be received for a predetermined number or more channels. on the other hand,
When the in-vehicle television device moves to the broadcast area B, the channels “2”, “9”, “11”, “31”, “33”, and “3” in the broadcast area B as shown in FIG.
Since a channel plan is set up so that a broadcast signal can be received in each frequency band corresponding to “5”, when the reception status of the broadcast signal at the tuning frequency is checked sequentially from channel “1”, three channels “ 1 "," 3 ",
It is found that there is no tuning frequency for "5" (step S120).

At this time, the microcomputer 30 determines that the in-vehicle television device is located outside the broadcast area A, and performs an auto memory operation to acquire a channel plan in the broadcast area B including the local point. It starts (step S140). As in the case of the preset operation in the broadcast area A described above, the microcomputer 30 controls the six channel channels “2”,
“9”, “11”, “31”, “33”, and “35” are channel number buttons “1”, “2”, “3”, “4”, “5” arranged on the remote control transmitter. , "6", the fact that the tuning frequency exists in each channel is written in the RAM 33, and the auto memory operation is completed.
In this sense, the microcomputer 30 constitutes a channel group updating unit according to the present invention.

As described above, the broadcast signal receiving means of the present invention is constituted by the PLL tuner 10 and the microcomputer 30
By configuring the channel group holding means, reception status determination means and channel group update means according to the present invention,
The configuration according to the present invention as shown in FIG. 6 is realized. That is, the broadcast signal receiving unit S2 receives the broadcast signal from the broadcast station based on each channel of the channel group stored in the channel group holding unit S1, and supplies the reception status of the broadcast signal to the reception status determination unit S3. At this time,
When the reception status determining means S3 informs the channel group updating means S4 that the broadcast signal has not been received, the channel group updating means S4 causes the broadcast signal receiving means S2 to search for a broadcast station that can be received at the present time. A new channel group is reassembled based on the broadcast station and updated by the channel group updating means S1.

The self-check function according to the present embodiment is provided as one of the selection items in a normal preset menu, and the user can turn on the self-check function on the menu screen, and The self-check function can be set.
As described above, when the power is turned on, when the self-check function is automatically executed, even if the user does not know that the user has moved beyond the broadcast area, the channel can be surely updated in the plan. Useful in that respect. On this occasion,
Even when the power is turned off, power may be supplied at regular time intervals on condition that the self-check function is on, and the self-check function may be used.

Since the above method is merely an example, an item for starting a self-check may be provided in a normal preset menu. In this case, when the user recognizes that the broadcast area has changed, and executes the self-check function using the operation button provided on the remote control transmitter 70 in the preset menu, the microcomputer 60 operates similarly to the case of the present embodiment. When a self-check is performed and a broadcast signal cannot be received at a tuning frequency for a predetermined number or more of channels, an auto memory operation is performed. In this sense, the remote control transmitter 70 constitutes an operation receiving unit according to the present invention.

As another method for executing the self-check function, the microcomputer 60 detects that the mode is switched from the navigation mode or the video mode by the GPS to the television mode, and determines whether the self-check function is set. It is also possible to start checking. Then, similarly to the case of the present embodiment, the microcomputer 6
0 indicates that the self-check function is executed at the time of mode switching, and if a predetermined number or more of the channels cannot receive the broadcast signal at the tuning frequency, the automatic memory operation is performed.

Further, in the present embodiment, the case where the broadcast signal receiving apparatus according to the present invention is applied to an in-vehicle television apparatus has been described. It is also possible to realize a normal television device having the above-described function, assuming that the device is moved to another broadcast area by the above-described method. As described above, when the power is turned on in the broadcast area B, the microcomputer according to the present embodiment searches the channel plan written in the RAM in the broadcast area A and searches the channel plan in three or more channels, as shown in FIG. If the tuning frequency is not found, an auto memory operation is executed to update the channel plan in the broadcast area B to the RAM. This eliminates the need for a seek operation by the user,
It is possible to provide a user-friendly in-vehicle television device.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a main configuration of an in-vehicle television device according to an embodiment.

FIG. 2 is an explanatory diagram showing a situation when an in-vehicle television device moves to a different broadcasting area.

FIG. 3 is a channel plan of a broadcast area A;

FIG. 4 is a flowchart showing a procedure when a microcomputer executes a self-check.

FIG. 5 is a channel plan of a broadcast area B;

FIG. 6 is a schematic diagram showing an outline of the present invention.

FIG. 7 is a schematic diagram showing an outline of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... PLL tuner 10a ... Antenna 11 ... Local oscillation circuit 12 ... Reference crystal oscillator 13 ... Phase comparator 20 ... IIC bus 30 ... Microcomputer 31 ... CPU 32 ... ROM 33 ... RAM 40 ... Chroma IC 50 ... CRT 60 ... Speaker 70 ... Remote control transmitter A, B ... Broadcast area

Claims (7)

[Claims] 1. A PLL tuner that receives a broadcast signal transmitted from a broadcasting station at a predetermined tuning frequency, converts the broadcast signal into an intermediate frequency signal, and outputs the intermediate frequency signal. And a CRT that outputs a video signal, a synchronizing signal, and an audio signal, outputs a video signal and a synchronizing signal output from the chroma IC, and outputs a video, and an output from the chroma IC. A speaker for inputting an audio signal to be output and an audio output, and at the time of initial power-on after installation, read out the channel assignments in the entire TV broadcast frequency band from the ROM and send the above-mentioned PLL tuner to the PLL tuner at a tuning frequency corresponding to each channel. By receiving a broadcast signal, it is determined whether or not a tuning frequency is assigned to each channel. During the channel tuning frequency is assigned to extract performs preset operations to write channel plan in the RAM, after power-up, on condition that the self-check mode is set, the RAM
If no tuning frequency has been assigned to three or more channels of the channel plan written in
By reading the broadcast signal from the OM and causing the PLL tuner to receive the broadcast signal at a tuning frequency corresponding to each channel, an automatic memory operation of extracting the channel to which the tuning frequency is assigned and overwriting the channel plan in the RAM is executed. A microcomputer which normally causes the PLL tuner to receive the broadcast signal at a tuning frequency corresponding to each channel of the channel plan, and causes the chroma IC to execute signal processing of an intermediate frequency signal based on the broadcast signal; An in-vehicle television device, comprising: a PLL tuner, a chroma IC, and an IIC bus for connecting a microcomputer and transferring data between the devices. 2. A broadcast signal receiving means for receiving a broadcast signal transmitted from a broadcast station; a channel group holding means for allocating the broadcast station to a channel and holding the broadcast station as a channel group; A reception status determination unit that determines whether the broadcast signal can be received based on a predetermined channel assigned by the holding unit; and when the reception status determination unit determines that the broadcast signal cannot be received. Channel group updating means for extracting a broadcast station corresponding to a broadcast signal receivable by the broadcast signal receiving means, allocating a channel to the extracted broadcast station, and updating the channel group. Broadcast signal receiving device. 3. The broadcast signal receiving apparatus according to claim 2, wherein the channel group updating unit determines that the broadcast signal cannot be received on a predetermined number or more channels by the reception status determination unit. A broadcast signal receiving apparatus for extracting a broadcast station corresponding to a broadcast signal receivable by the broadcast signal receiving means, allocating the extracted broadcast station to a channel, and updating the channel group. 4. The broadcast signal receiving device according to claim 2, wherein said receiving condition determining means determines that said broadcast signal receiving means can receive said broadcast signal. A broadcast signal receiving device that determines whether or not the broadcast signal can be received based on a predetermined channel assigned by the channel group holding device. 5. The broadcast signal receiving apparatus according to claim 4, wherein the reception status determining means is configured such that when the power is turned on, the broadcast signal receiving means is a predetermined one assigned by the channel group holding means. A broadcast signal receiving apparatus for determining whether or not the broadcast signal can be received based on a channel. 6. The broadcast signal receiving apparatus according to claim 2, wherein said reception status determining means includes an operation receiving means for receiving a predetermined operation, and said receiving condition determining means receives said predetermined operation. A broadcast signal receiving apparatus, wherein when receiving an operation, the broadcast signal receiving means determines whether or not the broadcast signal can be received based on a predetermined channel assigned by the channel group holding means. 7. A broadcast station transmitting a broadcast signal is allocated to a channel to hold a channel group, and it is determined whether or not the broadcast signal can be received based on the allocated predetermined channel. When it is determined that a signal cannot be received, a broadcast station corresponding to a broadcast signal that can be received under the current situation is extracted, and the extracted broadcast station is assigned to a channel to update the same channel group. Broadcast signal receiving method.