JP4137613B2 - Terrestrial digital receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terrestrial digital receiver, and more particularly to a terrestrial digital receiver that supports frequency changes at the start of terrestrial digital broadcasting.
[0002]
[Prior art]
When terrestrial digital broadcasting is implemented, broadcast frequency is changed by reassigning frequencies at the end of analog broadcasting. As a mechanism corresponding to such a frequency change, a packet describing content data including detailed frequency change information (target area information on which frequency change is performed, target transmitting station, frequency change date and time, frequency after change, etc.) In some cases, the frequency change setting can be automatically performed at the actual frequency change date and time by receiving the content packet in advance on the receiver side. The content packet is transmitted by weak layer DII (Download Information Indication) and DDB (Download DataBlock).
[0003]
Further, at the stage before the transmission of the content packet as described above, a packet storing notification information for notifying that a frequency change is scheduled is transmitted to the receiver. This notification information is notification information of frequency change information and includes identification information of a content packet, and transmission thereof is executed by a strong hierarchical SDTT (Software Download Trigger Table).
[0004]
FIG. 7 is a block diagram for explaining a configuration example of a conventional terrestrial digital receiver capable of only one-segment strong layer reception, and shows functional elements necessary for executing a download function using broadcast waves. is there. When the notification information transmitted by the one-segment strong layer reaches the DeMUX unit 33 from the one-segment tuner unit 31 through the one-segment demodulator unit 32, the CPU unit 36 notifies the user of the occurrence of the frequency change. At the same time as the message information is displayed on the video output unit 35 and stored in the information storage memory unit 37.
[0005]
FIG. 8 is a block diagram for explaining a configuration example of a conventional terrestrial digital receiver capable of receiving both a weak 12-segment hierarchy and a strong 1-segment hierarchy, and is necessary for executing a download function using broadcast waves. Elements are indicated by function blocks. When the notification information transmitted by the 1-segment strong layer reaches the DeMUX unit 43 from the 12- and 1-segment tuner unit 41 through the OFDM demodulator unit (12 and 1-segment demodulator unit) 42, the CPU unit 46 The identification information necessary for acquiring the content is acquired from the notification information and simultaneously displayed as a message on the video output unit 45.
[0006]
Thereafter, a process of creating a pseudo OFF state (actually an ON state) at the timing when the user turns off the power and waiting for content acquisition for a certain period of time is executed. When the content packet transmitted by the 12-segment weak layer reaches the demodulator unit 42 and the DeMUX unit 43 from the 12 and 1-segment tuner unit 41, the CPU unit 46 acquires the content data, and the target frequency information For example, frequency change information necessary for frequency change is read from the content data and stored in the information storage memory unit 47. Furthermore, the CPU unit 46 performs frequency change execution reservation processing from the frequency change date / time information included in the content data to the reservation activation sub CPU unit 48 to shift the power supply to the OFF state.
[0007]
When the actual frequency change date and time is reached, the reception activation is performed by the reservation activation sub-CPU unit 48 of the receiver, the frequency change of the receiver is executed based on the reservation information and the stored data, and the frequency change correspondence is completed.
[0008]
Patent Document 1 discloses a technique for more effectively performing download using broadcast waves, but also for program-related data transmission for changing the broadcast station transmission operation, a notification information storage packet (SDTT) and It is assumed that the content storage packet (DII, DDB) is acquired in order to use the content storage packet (DII, DDB) and make the receiver correspond to the transmission operation change.
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-53697
[Problems to be solved by the invention]
However, the conventional techniques as described above have problems as described below. In the transmission of program-related data by download, in a receiver capable of transmitting only content packets (DII, DDB) describing content data such as frequency change information and its start date / time in the weak layer and receiving only in the strong layer Unable to get these information. Accordingly, such a receiver cannot automatically follow the change of the broadcast frequency, and only operates to prompt the user to perform a frequency search. Also, the display timing for prompting such a search is not intended to be performed at the date and time when the frequency change actually occurs, so in many cases the user is informed before the frequency change occurs. It did not have a function of notifying the user when a frequency change occurred.
[0011]
Even for receivers that can receive data at a weaker level, a function to secure the memory capacity to store content data, a reservation function to change the reception frequency at the frequency change date, and a frequency change to change the frequency according to the reservation If the function was not installed, it could not follow the change of the broadcast frequency.
[0012]
In addition, there is a technology to perform frequency search and reception frequency preset by using broadcast stoppage as a trigger. However, in the conventional technology, not only frequency change but also when the broadcast wave is interrupted or stopped for some reason, all frequency search And the preset would be executed.
[0013]
The present invention has been made in view of the above circumstances, and it is possible to follow the broadcast frequency change only by receiving the notification information without receiving the content data describing the detailed frequency change information. Terrestrial digital receivers that are capable of handling strong hierarchical receivers that are not capable of receiving weak hierarchical layers. An object of the present invention is to provide a digital terrestrial receiver that does not require processing such as content data acquisition.
[0014]
[Means for Solving the Problems]
The first technical means of the present invention is a terrestrial digital receiver that presets the reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change. It is possible to acquire the notification information transmitted by the strong hierarchical SDTT, and previously store the broadcast time zone information of the broadcasting station, and when the stoppage of the broadcast wave being received is detected, the notification information is acquired. If the frequency change period information and the broadcast time zone information of the broadcast station correspond to the date and time when the wave was detected, the frequency search is performed and the channel is preset according to the frequency information acquired as a result of the frequency search. To do.
[0015]
A second technical means of the present invention is a terrestrial digital receiver that presets a reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change. When the broadcast time zone information of the broadcasting station is acquired in advance and the stop of the broadcast wave being received is detected, the user can change the frequency. This is characterized by notifying that there is a possibility of occurrence and prompting the execution of frequency search and preset.
[0016]
A third technical means of the present invention is a terrestrial digital receiver that presets a reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change, and the terrestrial digital receiver is capable of receiving strong hierarchical reception. The broadcast information of the broadcast station is acquired in advance and the broadcast time zone information of the broadcast station is stored in advance, and the stop of the broadcast wave being received is detected. If the detection of the broadcast wave does not return even after a predetermined time has elapsed, a frequency search is performed, and channel presetting is performed according to the frequency information acquired as a result of the frequency search.
[0017]
A fourth technical means of the present invention is a terrestrial digital receiver that presets a reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change. It is possible to obtain the notification information transmitted by the strong hierarchical SDTT, hold the broadcast time zone information of the broadcast station in advance, and detect the stop of the broadcast wave being received. If the detection of the broadcast wave does not return even after a predetermined time has elapsed, the user is notified that the frequency change may have occurred, and is urged to perform frequency search and preset.
[0019]
According to a fifth technical means of the present invention, in the first to fourth techniques described above, setting data for a general broadcast stop time period, which is a reference for determining a broadcast time period, can be input as the broadcast time period information. It is characterized by.
[0020]
A sixth technical means of the present invention is characterized in that, in the third to fifth technical means, data of a predetermined time which is a standby time until the return of the broadcast wave can be input.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram for explaining a configuration example of a terrestrial digital receiver capable of receiving only one-segment strong hierarchical reception according to the present invention, and shows elements necessary for a download function operation by a broadcast wave. . When the notification information transmitted by the 1-segment strong layer reaches the DeMUX unit 13 via the 1-segment tuner unit 11 and the 1-segment demodulator unit 12, the CPU unit 16 acquires the frequency change period information from the notification information. The acquired frequency change period information is stored in the information storage memory unit 17 and simultaneously displayed on the video output unit 15 as a message to the user.
[0022]
When the frequency is actually changed at the broadcasting station, in the terrestrial digital receiver, the radio wave being received is interrupted and the frequency unlock signal is transmitted from the one-segment tuner unit 11 to the CPU unit 16. The CPU unit 16 refers to the frequency change period information stored in the information storage memory unit 17 and determines whether the current time corresponds to the frequency change period and is within the broadcast time zone. As information for determining the broadcast time zone, for example, fixed value information such as 6 o'clock to 24 o'clock is held in the receiver, or even if the broadcast time information on the day is obtained accurately from the program information of the broadcast content Alternatively, the broadcast time period may be estimated using the daily reception time of the user as history information, and the information may be retained.
[0023]
When the current time corresponds to the frequency change period and is within the broadcast time zone, the CPU unit 16 instructs the one-segment tuner unit 11 to perform a frequency search. The one-segment tuner unit 11 performs a frequency search according to the instruction and sends frequency information on which broadcasting is being performed to the CPU unit 16. The CPU unit 16 stores the acquired frequency information in the information storage memory unit 17 as channel / preset information. Such processing operation completes the frequency change response.
[0024]
FIG. 2 is a block diagram for explaining a configuration example of a terrestrial digital receiver capable of receiving both the 12-segment weak layer and the 1-segment strong layer according to the present invention, and is necessary for the download function operation by the broadcast wave. Indicates an element. When the notification information transmitted by the 1-segment strong layer reaches the DeMUX unit 23 from the 12- and 1-segment tuner unit 21 through the OFDM demodulator unit (12 and 1-segment demodulator unit) 22, the CPU unit 26 The frequency change period information is acquired, and the acquired frequency change period information is stored in the information storage memory unit 27 and is simultaneously displayed on the video output unit 25 as a message to the user.
[0025]
When the frequency is actually changed at the broadcasting station, in the terrestrial digital receiver, the radio wave being received is interrupted and a frequency unlock signal is transmitted from the 12 and 1 segment tuner 21 to the CPU unit 26. The CPU unit 26 refers to the frequency change period information stored in the information storage memory unit 27 and determines whether the current time corresponds to the frequency change period and is within the broadcast time zone. As information for determining the broadcast time zone, for example, fixed value information such as 6 o'clock to 24 o'clock is held in the receiver, or even if the broadcast time information on the day is obtained accurately from the program information of the broadcast content Alternatively, the broadcast time period may be estimated using the daily reception time of the user as history information, and the information may be retained.
[0026]
When the current time corresponds to the frequency change period and is within the broadcast time zone, the CPU unit 26 instructs the 12 and 1 segment tuner unit 21 to perform a frequency search. The 12 and 1 segment tuner unit 21 performs a frequency search according to the instruction, and sends information on the frequency at which the broadcast is performed to the CPU unit 26. The CPU unit 26 stores the acquired frequency information in the case information storage memory unit 27 as channel / preset information. Such processing operation completes the frequency change response.
[0027]
As described above, the determination logic of frequency change occurrence in the digital terrestrial receiver is set as in the following embodiments.
FIG. 3 is a flowchart for explaining an example of determination logic of occurrence of frequency change in the digital receiver of the present invention. First, when the terrestrial digital receiver senses the stop of the broadcast wave (step S1), the frequency change target period (target area, start date, change, which has been acquired in advance by the date and time of occurrence of the stop and the notification information) Work period) (step S2). As a result of the collation, if the current time is within the target period, broadcast time zone information (data acquired from fixed value data or program information or estimated data from the user's reception time, etc.) previously stored in the receiver is stored. It is referred to and it is determined whether or not the present time corresponds to the broadcast time zone (step S3). If the current time is within the broadcast time zone, a frequency search and a channel preset according to the frequency search result are executed (step S4), and the system waits in that state (step S5).
[0028]
FIG. 4 is a flowchart for explaining another example of determination logic of occurrence of frequency change in the digital receiver of the present invention. First, when the terrestrial digital receiver senses the stoppage of the broadcast wave (step S11), the frequency change target period (target area, start date, change, which has been acquired in advance by the date and time of occurrence of the stoppage and the notification information) (Work period) is collated (step S12). As a result of the collation, if the current time is within the target period, broadcast time zone information (data acquired from fixed value data or program information or estimated data from the user's reception time, etc.) previously stored in the receiver is stored. It is referred and it is judged whether the present corresponds to a broadcast time zone (step S13). If the present time is within the broadcast time zone, a message for prompting a frequency search and a channel preset according to the frequency search result is displayed (step S14), and the system waits in that state (step S15).
[0029]
FIG. 5 is a flowchart for explaining still another example of frequency change occurrence determination logic in the digital receiver of the present invention. First, when the terrestrial digital receiver senses the stop of the broadcast wave (step S21), the frequency change target period (target area, start date, change, which has been acquired in advance by the date and time of occurrence of the stop and the notification information) (Work period) is collated (step S22). As a result of the collation, if the current time is within the target period, broadcast time zone information (data acquired from fixed value data or program information, estimated data from the user's reception time, etc.) previously stored in the receiver is stored. It is referred and it is judged whether the present corresponds to a broadcast time zone (step S23).
[0030]
If the present time is within the broadcast time zone, the state of the broadcast wave is monitored until time-out in order to distinguish it from temporary interruption of the broadcast wave due to mobile reception or some other interference (steps S24 and S25). If the state is not restored even if a time-out occurs, it is determined that a broadcast frequency change has occurred, a frequency search and a channel preset based on the result of the frequency search are executed (step S26), and the system waits in that state (step S26). S27).
[0031]
FIG. 6 is a flowchart for explaining still another example of frequency change occurrence determination logic in the digital receiver of the present invention. First, when the terrestrial digital receiver senses the stop of the broadcast wave (step S31), the frequency change target period (target area, start date, change, which has been acquired in advance by the date and time of occurrence of the stop and the notification information) (Work period) is collated (step S32). As a result of the collation, if the current time is within the target period, broadcast time zone information (data acquired from fixed value data or program information, estimated data from the user's reception time, etc.) previously stored in the receiver is stored. It is referred and it is judged whether the present corresponds to a broadcast time zone (step S33).
[0032]
If the present time is within the broadcast time zone, the state recovery of the broadcast wave is monitored until time-out in order to distinguish it from the temporary interruption of the broadcast wave due to mobile reception or some other disturbance (steps S34, S35). If the state is not restored even after the time-out, it is determined that the broadcast frequency has changed, and a frequency search and a message for prompting a channel preset based on the result of the frequency search are displayed (step S36). Wait (step S37).
[0033]
In addition, the receiver of each embodiment as described above is provided with an interface through which a user can input a numerical value so that the user can input data in a broadcast time zone (for example, 6:00 to 24:00). In addition, an interface through which a user can input numerical values is provided so that waiting time data (time data until timeout) until the broadcast state is restored can be input. For example, when used as a portable receiver, the user himself / herself assumes a time during which radio waves may be temporarily blocked behind a moving or shielding object, and allows the user to input the value (for example, 10 seconds). .
[0034]
【The invention's effect】
As is clear from the above description, according to the terrestrial digital receiver of the present invention, the broadcast frequency change tracking that could not be performed without receiving the contents describing the detailed frequency change information until now is received. Can be executed only by the receiver and can cope with the frequency change even in the strong layer receiver that cannot receive the weak layer in which the content is transmitted. It is not necessary to install the above-described memory and processing such as download reservation is not required, so that the configuration of the receiver can be simplified.
[0035]
In addition, it is possible to remarkably improve the accuracy of determination as to whether or not there is a wave stoppage due to a change in the broadcast frequency, compared to the conventional technique in which a frequency search is simply performed using a wave stop as a trigger. Furthermore, in a receiver capable of receiving only the strong layer, a frequency change occurrence message for the user can be displayed at the time of occurrence, and the user can immediately distinguish from a normal wave stop due to a broadcast stoppage or an accident.
[0036]
[Brief description of the drawings]
FIG. 1 is a block diagram for explaining a configuration example of a terrestrial digital receiver capable of receiving only one-segment strong hierarchical reception according to the present invention.
FIG. 2 is a block diagram for explaining a configuration example of a terrestrial digital receiver capable of receiving both a 12-segment weak hierarchy and a 1-segment strong hierarchy according to the present invention.
FIG. 3 is a flowchart for explaining an example of determination logic of occurrence of frequency change in the digital receiver of the present invention.
FIG. 4 is a flowchart for explaining another example of frequency change determination logic in the digital receiver of the present invention.
FIG. 5 is a flowchart for explaining still another example of frequency change occurrence determination logic in the digital receiver of the present invention;
FIG. 6 is a flowchart for explaining still another example of frequency change occurrence determination logic in the digital receiver of the present invention.
FIG. 7 is a block diagram for explaining a configuration example of a conventional terrestrial digital receiver capable of only one-segment strong layer reception.
FIG. 8 is a block diagram for explaining a configuration example of a conventional terrestrial digital receiver capable of receiving both a 12-segment weak layer and a 1-segment strong layer.
[Explanation of symbols]
11... 1 segment tuner section, 12... 1 segment demodulator section, 13, 23, 33, 43... DeMUX section, 14, 24, 34, 44... MPEG decoder section, 15, 25, 35, 45. , 16, 26, 36, 46... CPU section, 17, 27, 37, 47... Information storage memory section, 21, 41... 12 and 1 segment tuner section, 22, 42. 31, a segment tuner unit, 32, a segment demodulator unit, 48, a reservation activation sub CPU unit.

Claims (6)

  A terrestrial digital receiver that presets the reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change, the terrestrial digital receiver being capable of strong layer reception and having strong layer SDTT. The broadcast station frequency change period information acquired from the notification information when the broadcast time zone information of the broadcast station is stored in advance and a stop of the broadcast wave being received is detected. And the broadcast time zone information correspond to the date and time when the stoppage is detected, the frequency search is performed, and the channel is preset according to the frequency information obtained as a result of the frequency search. .   A terrestrial digital receiver that presets the reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change, the terrestrial digital receiver being capable of strong layer reception and having strong layer SDTT. The broadcast information of the broadcast station is acquired in advance, the broadcast time zone information of the broadcast station is acquired in advance, and when the stoppage of the broadcast wave being received is detected, the user may have changed the frequency. A terrestrial digital receiver characterized by informing and prompting for frequency search and preset execution.   A terrestrial digital receiver that presets the reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change, the terrestrial digital receiver being capable of strong layer reception and having strong layer SDTT. In addition to obtaining the notification information transmitted at the same time, holding the broadcast time zone information of the broadcast station in advance, and detecting a stop of the broadcast wave being received, even if a predetermined time has passed since the detection of the stop A terrestrial digital receiver characterized in that when a broadcast wave detection does not return, a frequency search is performed and a channel is preset according to frequency information acquired as a result of the frequency search.   A terrestrial digital receiver that presets the reception frequency of terrestrial digital broadcasting based on notification information for notifying the contents of frequency change, the terrestrial digital receiver being capable of strong layer reception and having strong layer SDTT. In addition to obtaining the notification information transmitted at the same time, holding the broadcast time zone information of the broadcast station in advance, and detecting a stop of the broadcast wave being received, even if a predetermined time has passed since the detection of the stop A terrestrial digital receiver characterized in that if the detection of a broadcast wave does not return, the user is notified that a frequency change may have occurred, and is prompted to perform a frequency search and a preset. In terrestrial digital receiver according to any one of claims 1 to 4, as the broadcasting time zone information, to be inputted setting data common broadcast stop time period as a reference of broadcast time zone determination A featured terrestrial digital receiver. The terrestrial digital receiver according to any one of claims 3 to 5 , wherein the predetermined time data that is a waiting time until the broadcast wave is restored can be input.

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