JP3318794B2 - Broadcast signal receiver and information channel detection method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention, additional information included in the broadcast signal, for example, VCR (video cassette recorder) to utilize the time information and TV (television receiver) broadcast signal receiver States of information, such as It relates to a channel detection method.

[0002]

2. Description of the Related Art Conventionally, when using a device having a timer function such as a VCR or the like, a user checks the display on a commander (remote control transmitter) or the screen display on a monitor TV, etc. It was necessary to set the time on the clock.

[0003]

As described above, conventionally, V
The user must set the time of an internal clock such as a CR, and a user who cannot set the time cannot use a function using a timer (for example, a timer recording function of a VCR).

[0004] Even if the time of the internal clock is set once, if the time goes wrong due to the power cord being unplugged, the time goes wrong with the lapse of time, or even in a country where daylight saving time occurs, daylight saving time and normal time In the case where the time goes wrong due to the change between the time and the like, the user has to set the time of the internal clock again, which is troublesome.

In order to eliminate such troublesome time setting by the user, time information is extracted from additional information included in a broadcast signal, for example, VBI data multiplexed in a vertical blanking period of a video signal. to, Ru it is considered to perform the time setting automatically.

[0006] The present invention, for example, to extract the current time information for the time setting described above, information channel detection of the broadcast signal receiver States that can detect the channel of a broadcast signal that contains additional information It provides a method.

[0007]

According to a first aspect of the present invention, there is provided a broadcast signal receiver, comprising: a tuning control means for sequentially changing a tuning channel; and a broadcast signal of a channel selected by the tuning control means. Current time information detecting means for detecting whether or not time information is included, and selecting a current channel when the current time information detecting means detects that the broadcast signal includes current time information. As a current time information channel.

The present time of the broadcast signal receiver according to the second invention
The time information channel detection method sequentially tunes a plurality of channels, detects whether or not the broadcast signal received in each tuned channel includes the current time information, and detects the current time information in the broadcast signal. If it is included, the selected channel at that time is stored in the memory as the current time information channel.

According to a third aspect of the present invention, there is provided a broadcast signal receiver, comprising: first tuning control means for sequentially changing a tuning channel at the time of auto preset; and broadcasting of a channel selected by the first tuning control means. First additional information detecting means for detecting at a first time whether or not additional information is included in the signal, and second tuning control means for sequentially changing the selected channel independently of the time of auto-preset. A second additional information detecting means for detecting at a second time longer than the first time whether or not the broadcast signal of the channel selected by the second tuning control means includes additional information; And a memory for storing the channel selected at that time as an additional information channel when the first and second additional information detecting means detects that the broadcast signal contains additional information.

According to a fourth aspect of the present invention, there is provided a method for detecting an additional information channel of a broadcast signal receiver, wherein a plurality of channels are sequentially tuned at the time of auto preset, and the broadcast signal received in each tuned channel includes the additional information. Is detected at a first time, and if the broadcast signal contains additional information, the channel selected at that time is stored in the memory as an additional information channel. Channels are sequentially selected, and it is detected at a second time longer than the first time whether or not additional information is included in a broadcast signal received on each of the selected channels. When the additional information is included, the channel selected at that time is stored in the memory as the additional information channel.

[0011] A broadcast signal receiver according to a fifth aspect of the present invention includes a video device and an external tuner. The video device controls the external tuner to sequentially change channel selection channels, and an external tuner. current time to detect whether the current time information to the broadcast signal of the channel selection channel is included in
Time information detecting means, and a memory for storing a channel selected at that time as a current time information channel when the current time information detecting means detects that the broadcast signal contains current time information. It is.

A present state of a broadcast signal receiver according to a sixth aspect of the present invention.
In the time information channel detection method, a video device controls an external tuner to sequentially select a plurality of channels, and in the video device, a broadcast signal received in each channel selected by the external tuner includes current time information. If the broadcast signal contains current time information, the selected channel at that time is stored in the memory as the current time information channel.

[0013]

According to the first and second aspects of the present invention, a plurality of channels are sequentially selected, and if the received broadcast signal includes current time information, the selected channel at that time is set to the current time.
Is intended to be stored in the memory as time information channel, it is possible to detect the current time information channel from the plurality of channels.

In the third and fourth inventions, a plurality of channels are sequentially selected at the time of auto-preset, and if the received broadcast signal includes additional information, the selected channel at that time is set as an additional information channel. The additional information channel can be detected from a plurality of channels in parallel with the auto preset operation at the time of auto preset. In addition, the time required to detect additional information during auto-preset is shorter than the time required to detect additional information when not performing auto-preset. Can be suppressed.

In the fifth and sixth inventions, a plurality of channels are sequentially selected by the external tuner, and when the current time information is included in the broadcast signal received by the external tuner, the selected channel at that time is selected. Is stored in the memory of the video device as the current time information channel, and, as with the case of using the internal tuner,
The current time information channel can be detected.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. This example is an example applied to a closed caption system.

In FIG. 1, reference numeral 1 denotes a cable box for performing channel selection processing, descrambling processing, and the like for a CATV signal. The CATV signals of a plurality of channels transmitted by a cable (not shown) are supplied to a tuner 12 via an input terminal 11. In the tuner 12, tuning is performed under the control of the tuner control microcomputer 13, and
The tuner 12 outputs a video signal of the selected channel. Note that the tuner 12 includes a descrambler, and also performs descrambling of the scrambled video signal.

Reference numeral 14 denotes a remote control signal receiving section, to which a remote control signal (infrared signal) output from an infrared light emitting section described later is supplied. Then, information such as channel selection and power on / off is supplied to the microcomputer 13 from the remote control signal receiving unit 14.

The video signal output from the tuner 12 is supplied to an RF modulator 15, converted into a broadcast signal of a predetermined channel, and supplied to a tuner 20 of the VCR 2. In the tuner 20, the channel of the broadcast signal output from the RF modulator 15 of the cable box 1 is selected under the control of the tuner / clock control microcomputer 22.

An NTSC video signal output from the tuner 20 is supplied to a data decoder 21. At a predetermined line in the vertical blanking period of this video signal,
Caption data (caption data) is inserted.
As shown in FIG. 2A, the caption data has seven periods (5
03 KHz) clock run-in signal and 2 bits (S
(1), a start bit of 1 bit (S3) after a logical level of “0” of S2) and a 16-bit N
It is composed of RZ data (data code). The clock run-in signal is a synchronization signal for decoding the data code, and the phase of the clock run-in signal is synchronized with the phase of the data code. The 16-bit NRZ data is composed of two sets of combinations of 7-bit ASCII codes b1 to b7 and 1-bit parity code. In FIG. 2A, HD is a horizontal synchronization signal, and SC is a color burst signal.

When caption data is multiplexed on a predetermined line in a vertical blanking period of a video signal output from the tuner 20, the data decoder 21
6-bit NRZ data is extracted and decoded from a hexadecimal code to a BCD code, and then supplied to the microcomputer 22 as caption data. In this case, for example, subtitles are displayed on the screen in units of a predetermined frame at each break of the text, and thus, subtitle data is stored in the RAM (not shown) in the microcomputer 22 in units of the predetermined frames.

Then, the subtitle data is read from the RAM of the microcomputer 22 and supplied to the display control circuit 23, where it is converted into character data (dot data). The display control circuit 23 is also supplied with a control signal indicating the display position from the microcomputer 22. In the display control circuit 23, a superimpose signal corresponding to the character data is formed at the timing of the display position on the screen, and is superimposed on the video signal supplied from the tuner 20 via the recording / reproduction processing circuit 24.

The video signal output from the display control circuit 23 is supplied to the RF modulator 25, converted into a broadcast signal of a predetermined channel, and then supplied to the TV monitor 3. Thus, when the caption data is multiplexed on the video signal output from the tuner 20, the TV monitor 3
Is displayed at a predetermined position on the screen.

Reference numeral 26 denotes a cable box control driver. A driver 26 is controlled by the microcomputer 22, whereby a predetermined remote control signal is supplied from the infrared light emitting unit 4 to the cable box 1, and the VCR 2 controls power on / off of the cable box 1 and a channel selection operation.

Reference numeral 27 denotes a mechanical control microcomputer for controlling operations of a head drive system, a reel drive system, a tape running system, and the like.

Although not described above, the tuner 20 detects the presence or absence of a video signal based on, for example, whether or not a horizontal synchronizing signal is detected, and the detection output SD is supplied to the microcomputer 22. Reference numeral 30 denotes a VBI as an additional information channel described later.
This is a memory (RAM) for storing channels.

In the VCR 2, the video signal output from the tuner 20 is recorded by the signal processing circuit 2 during recording.
4 to form a recording signal, which is supplied to a magnetic head 28 and recorded on a magnetic tape 29. At the time of reproduction, a signal reproduced from the magnetic tape 29 by the magnetic head 28 is processed by the signal processing circuit 24 to form a reproduced video signal, and the reproduced video signal is transmitted through the display control circuit 23 and the RF modulator 25. It is supplied to the TV monitor 3, and a reproduction screen is displayed on the TV monitor 3.

When caption data is not multiplexed on a predetermined line in a vertical blanking period of a video signal, for example, predetermined information (hereinafter referred to as "VBI data") may be transmitted using the line. Can be For example, the current time, information on whether or not it is summer time,
The information includes various information related to the program, such as the start time, elapsed time, and contents of the program currently transmitted or to be transmitted from now on, information on a broadcasting station transmitting the program, information on weather and disaster, and the like.

As shown in FIG. 2B, VBI data can be defined, for example, in the same signal format as caption data. A series of VBI data is transmitted using a plurality of lines. The VBI data of each line consists of one start bit following one start bit like the caption data.
It is composed of 6-bit NRZ data (two combinations of a 7-bit code b1 to b7 and a 1-bit parity code).

Here, in the first line of a plurality of lines on which a series of VBI data is transmitted, a start code for each class (type) of VBI data is transmitted using the first 7-bit code, and the last 7 bits are transmitted. V using code
A code indicating the type of BI data is transmitted. The data of the class and the type specified in the first line are sequentially transmitted using the first and second 7-bit codes in the second and lower lines.

As described above, the VBI data is transmitted when no caption data is transmitted, and when the transmission of the caption data is started before the entire series of VBI data is transmitted, the VBI data is transmitted. The transmission is interrupted, and the transmission of the VBI data is resumed after the transmission of the caption data ends (see FIG. 2B). In the first line after the restart of transmission, a continuation code for each class (type) of VBI data is transmitted using the first half 7-bit code, and a code indicating the type of VBI data is transmitted using the latter 7-bit code. Transmitted.

In the last line of the plurality of lines in which a series of VBI data is transmitted, an end code is transmitted using the first half 7-bit code, and a checksum is transmitted using the second half 7-bit code. You.

Here, examples of classes (kinds) and types will be described.

When the class (kind) is “Description of currently transmitted program” or “Description of program to be transmitted later”, the type is “Program start time” and “Program scheduled length / The "program elapsed time", the "program title", the "program type", the "target audience of the program", and the like. When the class is “special information that is not a program on the currently transmitted channel”, the type is “network name associated with the selected local station”, “station I
D "," hours and minutes of regular tape delay of network program of local station ". When the class is "explanation of other information", the type is "Greenwich Mean Time", "time lag from standard time and information on whether or not it is summer time" or the like. Class is "Transfer of public service messages and data such as weather forecasts and messages"
, The type is “weather forecast service” or the like.

In this example, the microcomputer 22 of the VCR 2
Detects a channel including VBI data as additional information as described above (hereinafter, referred to as a “VBI channel”), extracts time information from VBI data included in the VBI channel, and detects an internal time based on the time information. The time of the clock is automatically set.

FIG. 3 is a flowchart showing the operation of the microcomputer 22 when performing the time setting operation of the internal clock.

First, in step ST1, the memory 30
It is determined whether the VBI channel is stored. V
If the BI channel is not stored, step ST
The program proceeds to step 2 to control a remote control signal generated by the infrared light emitting section 4 to select the first channel from the channels that can be selected by the tuner 12 of the cable box 1.

Next, in step ST3, the VBI data is added to a predetermined line in the vertical blanking period of the video signal output from the tuner 20 of the VCR 2 in response to the broadcast signal of the channel selected by the tuner 12 of the cable box 1. It is determined whether or not there is. In this case, when the code data supplied from the data decoder 21 to the microcomputer 22 includes specific code data, that is, code data indicating a predetermined class (type) or type of the above-described VBI data, it is determined that VBI data is present. I do.

If it is not determined in step ST3 that there is VBI data, the determination operation is continued in step ST4 until a predetermined time T ₁ , for example, three minutes, elapses. When VBI predetermined time T ₁ without being judged that the data is there elapses at step ST3, the determines whether tunes all channels that may be selected by the tuner 12 proceeds to step ST5. When all channels have been selected, the operation ends. On the other hand, if not all channels have been selected, the process proceeds to step ST6, where a remote control signal generated from the infrared light emitting unit 4 is controlled, and the tuner 12 of the cable box 1 selects the next channel.
To determine whether there is VBI data as described above.

If it is determined in step ST3 that there is VBI data, the process proceeds to step ST7, and the channel selected by the tuner 12 at that time is stored in the memory 30 as a VBI channel.

Next, in step ST8, it is determined whether or not the video signal output from the tuner 20 of the VCR 2 has VBI data from which time data can be extracted, that is, time information. Here, the VBI data from which the time data can be extracted has the class “Description of other information” as described above,
The types are "Greenwich Mean Time" and "time difference from standard time and information on whether or not it is summer time". That is, if the data of Greenwich Mean Time and the data of the time lag with respect to Greenwich Mean Time are known, the time data of the local area can be obtained.

Therefore, the data decoder 21 instructs the microcomputer 22 that the type is "Greenwich Mean Time" and "information on the time difference from the standard time and whether or not it is summer time".
Is supplied, the microcomputer 22 determines that there is time information.

If it is not determined in step ST8 that there is time information, the determination operation is continued in step ST9 until a predetermined time T ₂ , for example, 10 minutes has elapsed. Step judgment time T ₂ described above in step ST9 ST4
Longer the than determination time T ₁ in is because often the direction of VBI data that may extract the time data than just VBI data is transmitted is small.

If it is determined in step ST8 that there is no time information and the predetermined time T ₂ has elapsed, the above-described step S8 is performed.
Return to T5. If it is determined in step ST9 that there is time information, the process proceeds to step ST10, where time data is extracted from the time information (VBI data from which time data can be extracted), and the time data is provided to the microcomputer 22. The time of the internal clock of the VCR 2 is set to the time (extraction time) based on the time data, and the operation ends.

If the VBI channel is stored in the memory 30 in step ST1, the process proceeds to step ST11 to control the remote control signal generated by the infrared light emitting unit 4, and the remote control signal is stored in the memory 30 by the tuner 12 of the cable box 1. The first channel is selected from the existing VBI channels.

Next, in step ST12, it is determined whether or not the video signal output from the tuner 20 of the VCR 2 has VBI data from which time data can be extracted, that is, time information. In this case, the determination is made in the same manner as in step ST8 described above. When in step ST12 is not determined that the time information is present, it continues to decision operation until the elapse of the predetermined time T ₂ at step ST13.

[0047] When the predetermined time T ₂ has elapsed without being determined as the time information in step ST12 is present, step ST14
To determine whether all the VBI channels stored in the memory 30 have been selected. When all VBI channels have been selected, the operation ends. On the other hand, when all the channels have not been selected, the process proceeds to step ST15 to control the remote control signal generated from the infrared light emitting unit 4, and the tuner 12 of the cable box 1 uses the tuner 12 next to the VBI channel stored in the memory 30. After selecting a channel, the process returns to step ST12 to determine whether there is time information as described above.

If it is determined in step ST12 that there is time information, the process proceeds to step ST10, where time data is extracted from the time information (VBI data from which time data can be extracted), and the time data is transmitted to the microcomputer 22. The time of the internal clock of the provided VCR 2 is set to the time (extraction time) based on the time data, and the operation ends.

In the example of FIG. 3, at the time of the first time setting, at least one VBI channel is stored in the memory 30 until the time setting is performed. Therefore, in the subsequent time setting, the operation of detecting the VBI channel is omitted, channel selection is performed in the range of the VBI channel stored in the memory 30, time information is detected, and time setting of the internal clock of the VCR 2 is performed. Done. As a result, the time required for setting the time can be reduced.

In the example of FIG. 3, the VBI channel is automatically stored in the memory 30, but the user himself or herself can use the VB channel by manual input means such as a keyboard (not shown).
The I channel may be stored in the memory 30. This is useful if the user knows the VBI channel. Before the first time setting, the VBI is manually stored in the memory 30.
By storing the channel, channel selection is performed within the range of the VBI channel stored in the memory 30 from the time of the first time setting, time information is detected, and the time of the internal clock of the VCR 2 is set.

As described above, the VB is automatically stored in the memory 30.
When the VBI channel is stored in the memory 30 by manual operation after the I channel is stored, the VBI channel stored by manual operation may be preferentially selected.

In the example shown in FIG. 3, the VBI channel is stored in the memory 30 at the time of the first time setting. In the case where an auto-preset function for sequentially storing the VBI data is provided, it is possible to automatically store the VBI channel in the memory 30 by detecting whether or not VBI data is present in each channel sequentially selected at the time of the auto-preset. In this case, the detection time of the VBI data is the detection time T ₁ of the VBI data in the example of FIG.
It is set to a shorter time, for example, several frames. By setting in this way, it is possible to suppress an increase in the required time at the time of auto presetting in which it is necessary to select a large number of channels.

In the example of FIG. 3, the V stored in the memory 30
The BI channel is used at the time of setting the time, but it goes without saying that the VBI channel stored in the memory 30 can be used other than at the time of setting the time. For example, it can be used as information of a channel to be selected in order to obtain weather forecast data or the like.

FIG. 4 is a flowchart showing another example of the operation of the microcomputer 22 when the time setting operation of the internal clock of the VCR 2 is performed. In the steps of the example of FIG.
The same reference numerals are given to portions corresponding to the steps in the example of FIG.

In the present example, step ST in the example of FIG.
1, except that the VBI channel is detected when the time is set, regardless of whether the VBI channel is stored in the memory 30 or not. In this case, since the VBI channel stored in the memory 30 is not used at the time of setting the time, step ST7 may be omitted. Incidentally, if the VBI channel is stored in the memory 30 without omitting the step ST7, the VBI channel can be used at times other than the time setting.

FIG. 5 is a flowchart showing another example of the operation of the microcomputer 22 when the time setting operation of the internal clock of the VCR 2 is performed. In the steps of the example of FIG. 5, FIG.
The same reference numerals are given to portions corresponding to the steps in the example of FIG.

In this example, before proceeding to step ST3, it is determined in step ST16 whether or not there is a video signal. This determination is made based on the detection output SD supplied from the tuner 20 to the microcomputer 22. When there is a video signal, the process proceeds to step ST3, and when there is no video signal, the process proceeds to step ST5.

[0058] In the example of Figure 5, when there is no video signal to the tuned channel (broadcast signal) is a clear lack of VBI data, the shorter the time T ₁ to jump step ST3, ST4 By doing so, the time required for the operation of detecting the VBI channel can be reduced.

In the above embodiment, the broadcast signal of the channel selected by the tuner 12 of the cable box 1 is supplied to the tuner 20 of the VCR 2, but the tuner 20 of the VCR 2 is provided with an antenna. The present invention can be similarly applied to a configuration in which a broadcast signal is directly supplied from a cable 5 (shown by a broken line in FIG. 1) or a cable (not shown), that is, a single VCR 2. In this case, the microcomputer 22 controls the tuner 20 to sequentially change the selected channel and detect the VBI channel.

In the above embodiment, VBI data multiplexed in the vertical blanking period of the video signal is shown as additional information. However, the additional information is inserted in a portion other than the vertical blanking period of the video signal. You may.
The format of the VBI data does not have to be the same as that of the caption data, and may be a separate format.

The above embodiment has been described with reference to an example in which the present invention is applied to a closed caption system having a VCR 2. However, if a broadcast signal such as a video signal or an audio signal contains additional information, the receiver itself may be used. Not a VCR,
Of course, the present invention can similarly be applied to a television receiver, a radio receiver, a receiver for satellite music broadcasting, and the like.

[0062]

According to the present invention, a plurality of channels are sequentially tuned, and when a received broadcast signal includes current time information, the selected channel at that time is stored in a memory as a current time information channel. The current time information channel can be detected from a plurality of channels and the time can be set.
Efficiently extract current time information from broadcast signals for setting
It is possible to do.

When an external tuner is used,
As in the case of using the internal tuner, the current time information channel can be detected from a plurality of channels by controlling the external tuner by the receiver main body.

[0064] When the current time information channel in the memory is stored, by to be sequentially tuned by the scope of the current time information channels, efficiently current time information <br/> report channel The current time information can be detected by tuning.

[0065] Also, to allow storing the current time <br/> information channel manually into the memory, by the current time information channel is to be tuned to preferentially efficiently current time information channel Is selected to detect current time information.

Further, when there is no broadcast signal in the selected channel, the operation for detecting the additional information is omitted and the next channel is immediately selected, thereby shortening the time required for detecting the additional information channel. it can.

In addition, a plurality of channels are sequentially selected at the time of auto preset, and when the received broadcast signal contains additional information, the selected channel at that time is stored in the memory as an additional information channel. In addition, at the time of auto-preset, an additional information channel can be detected from a plurality of channels in parallel with the auto-preset operation.

By making the detection time of the additional information at the time of the auto-preset shorter than the detection time of the additional information at the time of not the auto-preset, the time required for the auto-preset operation in which a large number of channels need to be selected is increased. Can be suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a broadcast signal receiver according to the present invention.

FIG. 2 is a diagram for explaining VBI data multiplexed on a broadcast signal.

FIG. 3 is a flowchart illustrating an example of a time setting operation of an internal clock.

FIG. 4 is a flowchart showing another example of the time setting operation of the internal clock.

FIG. 5 is a flowchart showing another example of the time setting operation of the internal clock.

[Explanation of symbols]

 1 Cable Box 2 VCR (Video Cassette Recorder) 3 TV Monitor 4 Infrared Light Emitting Unit 12, 20 Tuner 13 Tuner Control Microcomputer 14 Remote Control Signal Receiving Unit 15, 25 RF Modulator 21 Data Decoder 22 Tuner / Clock Control Microcomputer 23 Display Control Circuit 24 Recording / playback signal processing circuit 26 Cable box control driver 28 Magnetic head 29 Magnetic tape 30 Memory

Continuation of the front page (56) References JP-A-2-222287 (JP, A) JP-A-1-117584 (JP, A) JP-A-60-144085 (JP, A) JP-A-4-328981 (JP) JP-A-2-153630 (JP, A) JP-A-6-217271 (JP, A) JP-A-7-59064 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) H04N 5/38-5/46

Claims (13)

(57) [Claims] 1. Channel selection control means for sequentially changing channel selection channels; and current time information detection for detecting whether or not current time information is included in a broadcast signal of a channel selected by the channel selection control means. Means, and when the current time information detecting means detects that the broadcast signal includes the current time information, a memory for storing a channel selected at that time as a current time information channel is provided. Broadcast signal receiver. Wherein said tuning control means, now in the memory
When the time information channel is stored, when the current
2. The broadcast signal receiver according to claim 1, wherein a channel is selected in a range of a time information channel. 3. A channel input means for manually inputting a current time information channel to the memory, wherein the channel selection control means includes a current time information channel input to the memory by the channel input means. 2. The broadcast signal receiver according to claim 1, wherein the channel is selected with priority. 4. A signal detecting means for detecting whether or not there is a broadcast signal on a channel selected by the tuning control means, and when the signal detecting means detects that there is no broadcast signal, 2. A broadcast signal receiving apparatus according to claim 1, wherein the operation of detecting said current time information by said current time information detecting means is omitted, and the next channel is immediately selected by said tuning control means. Machine. 5. A sequentially tuning a plurality of channels, detects whether or not containing the current time information to the received broadcast signal in each of the channel selection channel, includes the current time information to the broadcast signal when that is the current time information <br/> report channel detection method of a broadcast signal receiver, characterized in that stored in the memory as the current time information channel tuning channel at that time. 6. A first tuning control means for sequentially changing a tuning channel at the time of auto presetting, and whether or not a broadcast signal of a channel selected by the first tuning control means contains additional information. A first additional information detecting means for detecting at a first time, a second tuning control means for sequentially changing a tuning channel irrespective of the auto preset, and a second tuning control means. A second additional information detecting means for detecting, at a second time longer than the first time, whether or not the broadcast signal of the channel selected at the second time is included in the broadcast signal; A memory for storing a channel selected at that time as an additional information channel when the additional information detecting means detects that the additional information is included in the broadcast signal. 7. A signal detecting means for detecting whether or not there is a broadcast signal on a channel selected by the first or second tuning control means, wherein the signal detecting means determines that there is no broadcast signal. If detected, the operation of detecting the additional information by the first or second additional information detecting means is omitted, and the first or second tuning control means immediately selects the next channel. The broadcast signal receiver according to claim 6, wherein: 8. A method for sequentially selecting a plurality of channels at the time of auto-preset, detecting at a first time whether or not additional information is included in a broadcast signal received on each of the selected channels, When additional information is included in the channel, the channel selected at that time is stored in the memory as an additional information channel, and a plurality of channels are sequentially selected regardless of the above auto-preset, and in each of the selected channels, Whether the received broadcast signal contains additional information is determined by the first
A broadcast signal receiver for detecting at a second time longer than the time, and when the broadcast signal includes additional information, storing the selected channel as the additional information channel in the memory. Additional information channel detection method. 9. A video device and an external tuner, wherein the video device controls the external tuner to sequentially change a channel to be selected, and selects a channel selected by the external tuner. Present in broadcast signals
A current time information <br/> paper detecting means for detecting whether or not contain stationary time information, when it is detected that contains the current time information on the broadcast signal in the current time information detecting means A memory for storing a channel selected at that time as a current time information channel. 10. The tuning control means stores the current
When the time information channel is stored, when the current
10. The broadcast signal receiver according to claim 9, wherein a channel is selected in a range of a time information channel. 11. The video equipment further comprises channel input means for manually inputting a current time information channel to the memory, wherein the channel selection control means includes a current time information channel input to the memory by the channel input means. 10. The broadcast signal receiver according to claim 9, wherein the broadcast signal is preferentially selected. 12. The video equipment further comprises signal detection means for detecting whether or not there is a broadcast signal on the channel selected by the channel selection control means. The signal detection means detects that there is no broadcast signal. The operation of detecting the current time information by the current time information detecting means is omitted, and the next channel is immediately selected by the tuning control means. Broadcast signal receiver. 13. A video device controls an external tuner to sequentially select a plurality of channels, and the video device transmits a current time information to a broadcast signal received on each channel selected by the external tuner. /> Is detected, and if the current time information is included in the broadcast signal, the currently selected channel is displayed.
A method for detecting a current time information channel of a broadcast signal receiver, which is stored in a memory as a time information channel.