JP2004120475A - Device and method for selecting channel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and accurately preset a channel even when a broadcasting channel is changed. <P>SOLUTION: A channel is searched in a digital tuner 14, whether the channel whose broadcasting is received has been already preset in an analog tuner 13 is discriminated, and if the same channel has been preset, the channel preset in the analog tuner 13 is eliminated. Next, a channel is searched in the analog tuner 13, if the channel different from the presetted channel is received, whether to preset the channel is inquired of a viewer on a display part 20, and if the viewer select presetting performance, the presetting is carried out. In addition, whether to update such a channel change to channel data corresponding to an area is inquired of the viewer, and data is updated as a needed basis. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tuner tuning device, and more particularly to a tuning device and a tuning method capable of performing accurate channel preset without waste in an area where terrestrial analog broadcasting and terrestrial digital broadcasting are mixed.
[0002]
[Prior art]
Television terrestrial digital broadcasting has been implemented in some regions from 2003 using some channels of the UHF (Ultra High Frequency) band, and digital broadcasting channels have been gradually expanded nationwide. In 2010, all channels will be shifted to digital broadcasting.
[0003]
Therefore, until 2010, analog broadcasting and digital broadcasting are mixed in the same UHF band. In such a situation, digital broadcasting is, in principle, planned to be carried out on a vacant channel, avoiding the channel on which the existing analog broadcasting is conducted, but it is not possible to carry out on a vacant channel In such a case, it is planned to change the channel of the analog broadcast to another channel and carry out the digital broadcast on the vacant channel.
[0004]
That is, as shown in FIG. 7, for example, 24 channels of analog broadcasting may be changed to 23 channels, and digital broadcasting may be carried out on 24 available channels.
Generally, a television receiver is provided with an area-corresponding channel information table in which broadcast channels receivable for each area are specified in advance, and the channel is preset by inputting the number of the area where the receiver is installed. It has a function, and it can be said that the viewer performs a preset using the function when the receiver is purchased, and hardly changes the channel setting thereafter.
[0005]
Therefore, when the channel is changed on the broadcast side in this way, even if the channel is selected to receive the 24 channels of the analog broadcast, noise is displayed on the screen because the digital broadcast is received. Alone, viewers can be mistaken for a breakdown.
[0006]
Conversely, there is a problem that the newly set channel 23 cannot be tuned and cannot be sufficiently received.
When the channel is changed in this way, it is extremely important that the new channel can be preset by a simple operation in terms of usability. Of course, the change of the channel is not reflected in the table, and even if the channel preset using the area number is performed, the preset corresponding to the channel change cannot be performed.
[0007]
Japanese Patent Application Laid-Open No. 2002-176590 discloses that a digital broadcast tuner and an analog broadcast tuner respectively perform channel search by auto search, and when the same analog broadcast channel is preset, data preset for the digital broadcast tuner. Has been proposed to delete the data of the analog channel from the above, but in this case, the same analog channel is preset to eliminate waste, which is different from the subject matter of the present invention. .
[0008]
As described above, conventionally, when the broadcast channel is changed, it has not been possible to easily reset the preset in response to the change.
[Patent Document 1]
JP-A-2002-176590 (pages 4 to 6, FIG. 4)
[0009]
[Problems to be solved by the invention]
As described above, conventionally, when a broadcast channel is changed, there is no device that can easily preset the change, and the realization of such a device is desired.
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a channel selection device and a channel selection method that can easily preset a broadcast channel even when the channel is changed.
[0010]
[Means for Solving the Problems]
A tuning device of the present invention selects an analog broadcast receiving tuner capable of receiving a plurality of channels, a digital broadcast receiving tuner capable of receiving the plurality of channels, and the analog broadcast receiving tuner. Channel selection means for presetting a channel selection signal supplied thereto, second channel selection means for supplying a channel selection signal for selecting the digital broadcast tuner, and the second channel selection Means for sequentially selecting each channel of the digital broadcast receiving tuner, determining whether or not a broadcast signal exists in the selected channel, and selecting a channel selection signal of a channel determined to have a broadcast signal. A preset means for presetting to the second tuning means; and a result of the preset processing by the preset means, the same channel is already preset by the first tuning means. And control means for releasing the preset of the channels in said first channel selection means if it is characterized by comprising a.
[0011]
According to the present invention, it is possible to easily search for a preset channel and release the preset, even though no broadcast is being performed.
A tuning apparatus according to the present invention includes an analog broadcast receiving tuner capable of receiving a plurality of channels, a digital broadcast receiving tuner capable of receiving the plurality of channels, the analog broadcast receiving tuner, and a digital broadcast receiving tuner. Channel selection means for supplying a channel selection signal for channel selection to a tuner; and presetting the channel selection signal corresponding to a preset reception channel of the analog broadcast reception tuner based on information specifying a region. A first preset means for sequentially selecting each channel of the digital broadcast receiving tuner and determining whether or not a broadcast signal exists in the selected channel; A second preset unit for presetting a tuning signal; and a preset in the first and second preset units. Result of the process, characterized in that the same channel is provided with a control means for releasing the preset of the channels according to the first preset means when it is preset.
[0012]
According to the present invention, according to the present invention, it is possible to easily search for a preset channel and release the preset, even though broadcasting is not being performed.
A tuning apparatus of the present invention is based on a tuner capable of receiving a plurality of channels, a tuning means for supplying a tuning signal to select a channel to the tuner, and information for specifying an area. Presetting means for presetting the tuning signal corresponding to a preset receiving channel of the tuner; and sequentially selecting each channel of the tuner to determine whether or not a broadcast signal exists on the selected channel. Then, a channel determined to have a broadcast signal is compared with a channel preset by the preset means, and when it is determined that a broadcast signal of a different channel is present, the preset of that channel is determined based on a user operation. And control means for executing.
[0013]
According to the present invention, the presence / absence of a new broadcast channel is searched for a channel preset by the regional channel data, and when a new broadcast execution channel exists, the preset of that channel is determined by the viewer. Since it is performed, the channel preset can be executed easily and accurately.
[0014]
A tuner of the present invention includes a tuner capable of receiving a plurality of channels, a tuner for supplying a tuning signal for selecting a channel to the tuner, and a tuner for each region. Storage means in which information and a reception channel of the area are stored in advance, and the tuning corresponding to the reception channel of the analog broadcast reception tuner based on the information stored in the storage means and specifying the area where the tuner is installed. A presetting means for presetting a signal; and sequentially selecting each channel of the analog broadcast receiving tuner, determining whether or not a broadcast signal is present in the selected channel, and determining whether or not there is a broadcast signal. And a channel preset by the preset means, and when it is determined that a broadcast signal of a different channel exists, that channel is determined. And executes based presets channel to the user's operation, characterized by comprising a control means for correcting the reception channel for the information that identifies the stored areas in the storage means.
[0015]
According to the present invention, the presence / absence of a new broadcast channel is searched for a channel preset by the regional channel data, and when a new broadcast execution channel exists, the preset of that channel is determined by the viewer. Since the channel data is updated at the discretion of the viewer, the channel preset can be executed simply and accurately.
[0016]
The channel selection method of the present invention sequentially selects each channel of a digital broadcast receiving tuner, determines whether or not a broadcast signal is present in the selected channel, and determines whether or not a channel is determined to have a broadcast signal. A step of presetting a tuning signal; a step of judging whether or not the same channel has already been preset as a tuning channel of the analog broadcast receiving tuner as a result of the preset processing in the preset step; Canceling the preset of the channel when it is determined that the channel has been preset as the selected channel.
[0017]
According to the present invention, according to the present invention, it is possible to easily search for a preset channel and release the preset, even though broadcasting is not being performed.
The tuning method of the present invention includes the steps of: presetting a reception channel of a tuner to a channel set in advance based on information specifying a region; and sequentially selecting each channel of the tuner to select a channel. A step of determining whether or not a broadcast signal is present; and, as a result of the determination in the determining step, a step of comparing a channel determined to have a broadcast signal with a channel preset in the preset step; Executing a preset of the channel based on a user operation when it is determined that a broadcast signal exists on a different channel.
[0018]
According to the present invention, according to the present invention, the presence / absence of a new broadcast channel is searched for a channel preset by the local channel data, and when a new broadcast execution channel exists, the preset of the channel is performed. Is performed at the discretion of the viewer, so that the channel preset can be executed easily and accurately.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an embodiment of the tuning apparatus of the present invention. In FIG. 1, the antenna 11 is connected to an antenna input terminal 12, and the antenna input terminal 12 is connected to an analog tuner 13 and a digital tuner 14.
The analog tuner 13 switches channels according to a tuning signal from the tuning microcomputer 15. The channel selection signal is stored in the non-volatile memory 16, and the channel selection signal corresponding to all the channels is flagged for the channel selection signal of the channel where the broadcast signal actually exists. The setting of a flag corresponding to a channel selection signal actually used for channel selection is called a preset. Usually, a channel which can be received for each region and stored in the memory of the channel selection microcomputer 15 is called a preset. The viewer causes the remote control hand unit or the like to execute the preset based on the data.
[0020]
The operation of the input unit 17 drives the channel selection microcomputer 15, and the channel selection is performed by the channel selection signal read from the nonvolatile memory 16. The input unit 17 can be configured by a plurality of switches provided on a housing of the device, or can be configured as a receiving unit that receives and processes a remote control signal from a remote control hand unit.
[0021]
From the analog tuner 13, a reception signal converted to an IF (Intermediate Frequency) signal is output, and the video signal is demodulated by the demodulation unit 18 and supplied to the video signal processing unit 19, where processing such as two-screen display processing is performed. Is supplied to the display unit 20 and displayed.
[0022]
Further, the synchronization signal is separated from the video signal demodulated by the demodulation unit 18 by the synchronization signal detection unit 21 and supplied to the tuning microcomputer 15. The synchronization signal detected by the synchronization signal detection unit 21 is used by the tuning microcomputer 15 as a signal indicating that a broadcast signal exists on the selected channel.
[0023]
The digital tuner 14 switches channels according to a tuning signal from the tuning microcomputer 22. The tuning signal is stored in the non-volatile memory 23, and the tuning signal is read out from the non-volatile memory 23 by operating the input unit 17 and supplied to the digital tuner 14 as in the analog tuner 13, to select the channel. Execute.
[0024]
The received signal received by the digital tuner 14 is OFDM-demodulated / error-corrected by an OFDM (Orthogonal Frequency Division Multiplex) demodulation / error correction unit 24 and error-corrected. (Experts Group) decoding unit 25. Here, the video data is separated and extracted, decoded, and supplied to a graphic processing / DAC (Digital Analog Converter) unit 26. The graphic processing / DAC unit 26 superimposes a table, graphics, and the like as necessary, converts the data into an analog signal, and supplies the analog signal to the video signal processing unit 19.
[0025]
The video signal processing unit 19 performs selective switching with the video signal on the analog tuner 13 side or compression processing for two-screen display with the video signal from the analog tuner 13 and the like, and the video signal is displayed on the display unit 20. You.
The output of the OFDM demodulation / error correction unit 24 is supplied to a BER (Bit Error Rate) detection circuit 28, where the bit error rate of the digital data is detected, and the result is supplied to the channel selection microcomputer 22. If a broadcast signal is present on the selected channel, the bit error rate drops below a predetermined value, so that it is possible to determine whether a broadcast signal exists on that channel.
[0026]
Further, a control unit 27 is provided, which receives additional data included in the TS signal separated by the demultiplexer / MPEG decoding unit 25 by a viewer's operation of the input unit 17, generates a table or a character, and performs graphic processing / The data is supplied to the DAC unit 26 to control a process of superimposing them on the decoded video data. Further, the control unit 27 selects a video to be displayed on the display unit 20 by operating the input unit 17 of the viewer, or consults with the viewer to select whether or not to execute a channel preset described later. Is displayed, and control for executing the item selected by the viewer is performed.
[0027]
In the channel selecting device configured as described above, as shown in FIG. 7, it is assumed that 24 channels of analog broadcasting are changed to 23 channels, and 24 channels of digital broadcasting are newly implemented. .
In this state, the viewer first selects each channel sequentially from the input unit 17 to the digital tuner 14, and sequentially stores the channels determined to have the broadcast signal in the nonvolatile memory. A so-called channel search is executed.
[0028]
That is, in the digital tuner 14, the channel is sequentially selected from the UHF 13 channel, and it is determined whether or not the broadcast is present based on the signal from the BER detection circuit 28. A flag is set in the nonvolatile memory 23 for the tuning signal.
[0029]
As a result, when the same channel as the channel already preset in the non-volatile memory 16 on the analog tuner 13 side is preset in the non-volatile memory 23 by the digital tuner 14, the channel is determined to be a channel in which no analog broadcast exists. Then, the flag of the channel selection signal of the relevant channel in the nonvolatile memory 16 is deleted.
[0030]
That is, according to the example of FIG. 7, the channel 24 preset for the analog tuner is deleted.
As a result, the viewer does not receive the analog 24 channels, and a phenomenon such as mistakenly being mistaken for a failure does not occur.
The processing described above will be described with reference to the flowchart of FIG.
In the process of FIG. 2, the process is started in step 2a, and in step 2b, first, the analog broadcast channel information corresponding to the area code stored in the channel selection microcomputer 15 for each area is read out, and in step 2c, the read information is read out. The preset is executed based on.
[0031]
Next, in step 2d, a search tuning process of the digital tuner 14 is performed, and presetting is sequentially performed based on the determination of the presence or absence of the broadcast signal.
Next, in step 2e, it is determined whether or not the same channel as the preset of the analog broadcast has been preset. If the same channel has been preset, the preset of the analog channel is canceled in step 2f, and the process ends in step 2g. It becomes.
[0032]
In this way, it is possible to cancel the preset of an analog channel that is not broadcasted. However, in such a situation, the channel whose preset has been canceled is changed to another channel and broadcast is performed. Since there is a high possibility that the new channel will be set, it is necessary to execute presetting of the new channel, which will be described below.
[0033]
The viewer executes a search channel selection process of the analog tuner 13. As a result of the search channel selection, if a channel different from the broadcast channel based on the area code is determined to have a broadcast signal, an inquiry is made to the viewer as to whether or not to preset a new channel. Is desired, for example, by operating a remote control hand unit (not shown), the preset of the channel can be executed.
[0034]
That is, the tuning microcomputer 15 is driven via the input unit 17 to sequentially select a channel from the channel 13, and based on the synchronization signal from the synchronization signal detection unit 21, whether or not a broadcast exists on the selected channel. judge.
If it is determined that a broadcast is present, it is determined whether or not the channel is the same as a preset channel. If the channel is different, a new channel is provided from the control unit 27 as shown in FIG. Message information indicating whether or not to preset a channel determined to have a broadcast is read out, supplied to the video signal processing unit 19, and displayed on the display unit 20.
[0035]
When the viewer sees the message and wishes to preset a new channel, he operates the remote control hand unit and selects [YES] with the cursor, and operates the enter key, for example, to operate the enter key. Is executed.
[0036]
With this configuration, even when the analog broadcast channel is changed to another channel, a new channel can be easily preset.
In addition, this new channel is not included in the channel corresponding to the region code, and if the preset is executed using the region code, the channel returns to the original preset state. It is also preferable to correct the channel information of, and when the preset of a new channel is executed, it is better to make the viewer select whether or not to correct the channel information of the area code.
[0037]
That is, as shown in FIG. 4, a message as to whether or not to correct the channel information of the area code is displayed on the screen, so that the viewer can select with the cursor key and the enter key of the remote control hand unit. In this case, the configuration is such that the channel information of the area code is corrected, including the deletion of the changed original channel.
[0038]
The above series of processing will be further described with reference to the flowchart of FIG.
The process from the start of step 5a to the deletion of the preset in step 5f is the same as in the flowchart of FIG. 2, and a detailed description thereof will be omitted.
In step 5g, a channel search for analog broadcasting is executed. As a result of the search, in step 5h, it is determined whether there is a channel on which broadcasting is being performed in addition to the preset channels, and if there is a channel, Next, in step 5i, a selection guide as to whether or not to execute the preset of the channel is provided.
[0039]
Next, at step 5j, it is determined whether or not the execution of the preset is selected. When the execution of the preset is selected, the preset of the new signal channel is executed at step 5k. Next, in step 51, a selection is made as to whether or not to update the regional channel data. If the data is to be updated, the channel data is updated in step 5m, and the channel data 5n is updated.
[0040]
If NO is selected in steps 5e, 5h, 5j, and 5l, the process ends in step 5o.
As described above, the channel selection device of the present invention first performs a channel search in the digital tuner 14 and, when it is determined that a broadcast signal is present on the same channel as a preset analog broadcast channel, Since the preset of the analog channel is released, useless preset can be eliminated.
[0041]
Further, when a channel search is performed by the analog tuner 13 and a broadcast signal is detected in a channel other than the preset channel, the viewer is caused to execute the preset of the channel, and the regional data is updated as necessary. Thus, the channel preset corresponding to the actual broadcast can be executed by a simple operation.
[0042]
FIG. 6 is a block diagram showing another embodiment of the present invention.
In FIG. 6, the tuner is configured as a device 60 that can receive both digital broadcasting and analog broadcasting.
In FIG. 6, a broadcast signal from an antenna input terminal 61 is supplied to an RF (Radio Frequency) amplifier circuit 62 and amplified, and a signal of a predetermined band is extracted by a double tuning circuit 63 and supplied to a mixer circuit 64. A signal of a frequency corresponding to each channel generated by the frequency synthesizer method is added to the mixer circuit 64, mixed with the reception signal supplied from the double tuning circuit 63, and extracted as an IF signal from the IF tuning circuit 65. You. The output of the IF tuning circuit 65 is amplified by an IF amplifier circuit 66 and supplied to a digital broadcast signal demodulation circuit 67 and an analog broadcast signal demodulation circuit 68.
[0043]
The digital broadcast signal demodulation circuit 67 has a configuration similar to that of the OFDM demodulation / error correction unit 24 shown in FIG. 1, and outputs a TS signal to a subsequent stage. The analog broadcast signal demodulation circuit 68 has the same configuration as the demodulation unit 18 in FIG. 1, and outputs a demodulated signal to a subsequent stage.
The frequency synthesizer circuit includes a VCO (Voltage Controlled Oscillator) 69, a programmable frequency divider 70, a phase comparator 71, a reference signal source 72, and a loop filter 73, and sets a frequency division coefficient in the programmable frequency divider 70. Accordingly, the oscillation frequency of the VCO 69 is changed correspondingly.
[0044]
By the viewer operating the input unit 76, the frequency division coefficient corresponding to each channel read from the non-volatile memory 75 is set in the programmable frequency divider 70 via the microcomputer 74, thereby performing channel selection. Is done. That is, the frequency division coefficient is a channel selection signal.
[0045]
The BER output from the digital broadcast signal demodulation circuit 67 is detected by the BER detection circuit 77 and supplied to the microcomputer 74 to determine whether a broadcast signal exists on the selected channel. Further, from the output of the analog broadcast signal demodulation circuit 68, a synchronization signal is detected by a synchronization detection circuit 78 and supplied to the microcomputer 74 to determine whether or not the broadcast signal is present on the selected channel.
[0046]
In the apparatus configured as described above, it is usual that the channel for analog broadcasting and the channel for digital broadcasting are preset in advance so that the channels can be switched accurately. The change of the channel preset can be executed in the same manner as in the device shown.
[0047]
First, all channels are searched to determine whether or not a digital broadcast has been received. At this time, if a digital broadcast is received on the same channel as a preset analog broadcast channel, the analog broadcast is received. Delete the preset for that channel.
[0048]
Next, a channel search is performed in the same manner to determine whether there is a channel that has received an analog broadcast in addition to the preset analog broadcast channel. When a new channel is determined, presetting of that channel is performed. Whether or not to do so is presented to the viewer with a selection message. When the viewer selects to execute the preset, the channel preset is executed, and then a message asking whether to update the regional channel data is presented to the viewer, and when the viewer selects the update, the data is updated. Perform
[0049]
The above processing is as shown in the flowcharts of FIGS.
Also in this embodiment, it is possible to delete a preset of a channel on which broadcasting is not performed, and easily implement a preset of a channel on which broadcasting is newly performed. In addition, it is possible to update the regional channel data in accordance with such a change in the channel.
[0050]
As described above, according to the present invention, a digital broadcast channel search is performed, and based on the fact that the digital broadcast has been received on the same broadcast channel as the preset analog broadcast channel, the analog broadcast is performed. In spite of the absence, the channel in which the preset is performed is determined, and the preset of the channel is released, so that the preset can be easily updated.
[0051]
In addition, a channel search is performed, and if there is a channel that can be received other than the preset channel, the channel is preset to be executed at the discretion of the viewer, and further, such a channel change is performed. Thus, since the channel data corresponding to the region is updated, it is possible to execute an accurate channel preset.
[0052]
【The invention's effect】
As described above, according to the present invention, when a broadcast channel is changed, it is possible to easily execute a channel preset according to the change, so that accurate channel selection can be performed. Things.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a channel selection device according to the present invention.
FIG. 2 is a flowchart for explaining the operation of the apparatus shown in FIG. 1;
FIG. 3 is a diagram for explaining the operation of the device shown in FIG. 1;
FIG. 4 is a diagram for explaining the operation of the device shown in FIG. 1;
FIG. 5 is a flowchart for explaining the operation of the apparatus shown in FIG. 1;
FIG. 6 is a block diagram showing another embodiment of the tuning apparatus of the present invention.
FIG. 7 is a diagram for explaining a change of a broadcast channel.
[Explanation of symbols]
11 ... antenna
12 ... antenna input terminal
13. Analog tuner
14 ... Digital tuner
15,22 ... Microcomputer for channel selection
16, 23… Non-volatile memory
17 ... input section
18 demodulation unit
19 ... Video signal processing unit
20 Display unit
21 ... Synchronous signal detector
24: OFDM demodulation / error correction unit
25 ... Demultiplexer / MPEG decoding unit
26 Graphic processing / DAC section
27 ... Control unit

Claims (8)

An analog broadcast receiving tuner capable of receiving a plurality of channels,
A digital broadcast receiving tuner capable of receiving the plurality of channels,
A first tuning means in which a tuning signal supplied for tuning the analog broadcast receiving tuner is preset;
Second tuning means for supplying a tuning signal for tuning the digital broadcast tuner;
The second channel selecting means sequentially selects each channel of the digital broadcast receiving tuner, determines whether or not a broadcast signal exists on the selected channel, and determines that there is a broadcast signal. Presetting means for presetting a channel selection signal to the second channel selection means;
Control means for canceling the preset of the channel in the first tuning means when the same channel has already been preset in the first tuning means as a result of the preset processing in the preset means;
A tuning device, comprising: An analog broadcast receiving tuner capable of receiving a plurality of channels,
A digital broadcast receiving tuner capable of receiving the plurality of channels,
Tuning means for supplying a tuning signal for tuning a channel to the analog broadcast receiving tuner and the digital broadcast receiving tuner;
First preset means for presetting the tuning signal corresponding to a reception channel of the analog broadcast reception tuner which is set in advance based on information for specifying an area;
Sequentially selecting each channel of the digital broadcast receiving tuner, determining whether a broadcast signal is present in the selected channel, and presetting a channel selection signal of a channel determined to have a broadcast signal. 2 preset means,
Control means for canceling the preset of the channel by the first preset means when the same channel is preset as a result of the preset processing in the first and second preset means;
A tuning device, comprising: A tuner that can receive multiple channels,
Tuning means for supplying a tuning signal to tune a channel to the tuner;
Presetting means for presetting the tuning signal corresponding to a reception channel of the tuner set in advance based on information specifying an area,
Each channel of the tuner is sequentially tuned, and it is determined whether or not a broadcast signal is present in the selected channel, and a channel determined to have a broadcast signal is compared with a channel preset by the preset means. And, when it is determined that there is a broadcast signal of a different channel, a control unit that executes a preset of the channel based on a user operation,
A tuning device, comprising: A tuner that can receive multiple channels,
Tuning means for supplying a tuning signal for tuning a channel to the tuner;
For each region, storage means in which information for specifying the region and reception channels in the region are stored in advance,
Presetting means for presetting the tuning signal corresponding to a receiving channel of the analog broadcast receiving tuner based on information specifying an area where the tuner is installed, stored in the storage means,
Each channel of the analog broadcast receiving tuner is sequentially tuned, and it is determined whether or not a broadcast signal is present in the tuned channel. The channels are compared, and when it is determined that a broadcast signal of a different channel is present, the preset of the channel is executed based on the operation of the user, and the reception channel for the information specifying the area stored in the storage means is set Control means for modifying;
A tuning device, comprising: Sequentially selecting each channel of the digital broadcast receiving tuner, determining whether a broadcast signal exists in the selected channel, and presetting a channel selection signal of the channel determined to have a broadcast signal; ,
A step of determining whether or not the same channel has already been preset as a selected channel of the analog broadcast receiving tuner as a result of the preset processing by the preset step;
When it is determined by the determination step that the channel has been preset as a channel selection of the analog broadcast receiving tuner, a step of canceling the preset of the channel,
A tuning method, comprising: 6. The tuning method according to claim 5, wherein the receiving channel of the analog broadcast receiving tuner is preset based on information specifying a region. Presetting a receiving channel of the tuner to a preset channel based on information specifying a region;
Sequentially selecting each channel of the tuner, and determining whether a broadcast signal is present on the selected channel;
Comparing the channel determined to have a broadcast signal with the channel preset in the preset step as a result of the determination in the determination step;
As a result of the comparing step, when it is determined that a broadcast signal is present on a different channel, a step of executing a preset for that channel based on a user operation,
A tuning method, comprising: As a result of the comparing step, when it is determined that a broadcast signal is present on a different channel, executing a preset of the channel and correction of channel information corresponding to the information specifying the area based on a user operation. The tuning method according to claim 7, comprising:

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