JP3913668B2 - Digital broadcast receiver - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a digital broadcast receiving apparatus that receives a digital broadcast.
[0002]
[Prior art]
A digital broadcast receiving apparatus that receives a digital broadcast using a satellite or a terrestrial wave selects an arbitrary broadcast wave from a plurality of broadcast waves received through a dedicated antenna or a terrestrial antenna using a tuner, and selects the selected broadcast wave. An arbitrary channel is selected from among a plurality of channels included in the wave by demultiplexing processing, a digital signal of the selected channel is taken out and decoded to output a video / audio signal.
[0003]
In particular, in a receiving apparatus that receives terrestrial digital broadcasting, it is desirable to execute initial channel search processing as initial setting when the receiving apparatus is installed, and to acquire stationed / unstationed information of each channel. In addition, even after initial settings are executed, in order to respond to the opening of a new broadcasting station, the installation of a new relay station, or a change in broadcasting frequency, etc., a re-channel search is often performed using a non-viewing time such as standby. Is desirable.
[0004]
FIG. 5 is a flowchart illustrating a conventional channel search. For example, the lowest frequency (for example, ch12) in the UHF band is set as the start frequency (step S31), and the frequency is set in the tuner (step S32). The CPU determines whether or not the broadcast has been received at the aforementioned frequency (the tuner has locked the frequency) (step S33). In terrestrial digital broadcasting, each broadcast station has its own reception data (for example, service list, TS_ID, frequency, etc.) called NIT (Network Information Table) at each frequency . These data may be referred to as “reception data”. .) since sending the, if it can receive the broadcast can be received NIT. If the broadcast could not be received, a timeout provided for reception check in advance is determined (step S34), and if it is a timeout, the process proceeds to step S36. When the broadcast can be received, the received data is acquired and stored in the memory (step S35). Then, it is determined whether or not the frequency being scanned is the final frequency (for example, ch 62) (step S36). If it is not the final frequency, the frequency is increased (step S37) and the process proceeds to step S32. If it is determined that the final frequency is reached, the channel search is terminated.
[0005]
As a conventional broadcast receiving apparatus for performing channel search, there is one that performs channel search in parallel in two CPUs in charge of analog broadcasting and digital broadcasting (see Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-171453
[Problems to be solved by the invention]
By the way, the above-mentioned channel search usually requires several tens of minutes depending on the conditions. During the initial channel search, the program cannot be viewed and it is necessary to wait for the channel search to end. . If the user performs a reception operation or the like during the re-channel search, the search is interrupted, and in this case, there will be a channel that has not been re-searched. Further, if the re-channel search is frequently executed, it is necessary to energize the receiving apparatus during this time, so that much power consumption is required.
[0008]
In view of the above circumstances, an object of the present invention is to provide a digital broadcast receiving apparatus that can acquire the latest reception data while minimizing the time required for channel search.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problem, the digital broadcast receiving apparatus of the present invention is a digital broadcast receiving apparatus that acquires data provided for each channel by executing a channel search, and stores the last tuning date and time for each channel. And a control means for selecting a channel for which a predetermined period has elapsed from the last tuning date and time and performing a channel search in the new channel search.
[0010]
In the above configuration, it is considered that channels that have passed a predetermined period are often not able to acquire the latest data compared to channels that have not passed the predetermined period. Re-channel search will be performed.
[0011]
It is preferable that the last tuning date and time of the channel selection channel is updated when channel selection is instructed by the user. According to this, not only the tuning in the channel search but also the last tuning date / time is updated when the channel selection is instructed by the user.
[0012]
Further, the digital broadcast receiving apparatus of the present invention is a digital broadcast receiving apparatus that acquires data provided for each channel by executing a channel search. For each channel, the channel search execution date and time, the last tuning date and time, and the last successful reception date and time are indicated. Storage means for storing, and control means for selecting a search target channel based on the date and time and performing a channel search in a new channel search, are provided.
[0013]
With the above configuration, in a new channel search, not all channels are targeted, but channels satisfying a predetermined condition are selected and subjected to channel search, so a re-channel search is performed efficiently. Will be able to.
[0014]
The last tuning date and time and the last successful reception date and time are the same, the last tuning date and time is newer than the channel search execution date and time, and a channel that has not passed the predetermined period from the last tuning date and time is excluded from the search target channels. It is good to be. According to this, since it is considered that the broadcast has been successfully received by the channel selection by the user since the previous channel search performed for a certain channel, and it is considered that new information has been acquired at that time, such a channel is excluded. By doing so, an efficient re-channel search can be performed.
[0015]
It is preferable that the channel search is preferentially executed by using channels having the same channel search execution date / time, last tuning date / time, and last reception success date / time as update search target channels. With such a configuration, since it is considered that the broadcast has not been received by the channel selection by the user since the channel search performed for a certain channel last time and new information has not been acquired, priority is given to such a channel. This enables efficient re-channel search.
[0016]
A channel search is executed with a channel whose latest tuning date is newer than the last successful reception date and time as a search target channel at a predetermined timing, and the data is deleted for a channel that has been subjected to the channel search continuously several times. It should be configured. With such a configuration, it is possible to delete the data of a channel that is considered to have been stopped.
[0017]
It is preferable that the channel search is executed with a channel having no data as an additional search target channel at a predetermined timing, and when the reception is successful, the data of the channel is acquired. In such a configuration, for example, by setting a short period as the predetermined timing, it is possible to quickly cope with new station opening and the like.
[0018]
It is preferable that the last tuning date and time of the selected channel is updated even when the channel selection is instructed by the user, and the last successful reception date and time is also updated when the channel is receivable. Further, in the above configuration, when a channel without data is successfully received by tuning by user channel selection, it is preferable to acquire the data of that channel.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. Here, a case where a user views digital terrestrial broadcasting is illustrated. FIG. 1 is a block diagram showing a digital broadcast receiving apparatus 30 of this embodiment, FIG. 2 is a flowchart explaining channel search processing of this embodiment, FIG. 3 is an explanatory diagram illustrating channel information, FIG. 4 is a flowchart for explaining processing at the time of channel selection by the user.
[0020]
In FIG. 1, an antenna 1 is arranged outdoors in a predetermined direction, and receives a digital broadcast signal sent from a terrestrial broadcast station.
[0021]
The tuner 2 extracts a signal of a specific frequency from the high frequency digital modulation signal including video / audio data. Further, the tuner 2 includes a demodulation circuit, a deinterleave circuit, an error correction circuit, and the like, thereby demodulating the selected digital modulation signal and outputting a transport stream.
[0022]
The demultiplexer (DEMUX) 3 separates the transport stream into MPEG2 (Moving Picture Experts Group 2) video stream, audio stream, PSI / SI (Program Specific Information / Service Information) and the like. The demultiplexer 3 supplies the video stream and the audio stream to the AV decoder 4 and supplies program related information (program name, program start time, program content information, etc.) included in the PSI / SI to the CPU 13. As described above, a plurality of channels are multiplexed in the transport stream, and processing for selecting an arbitrary channel from among these is performed in the transport stream from the PSI / SI. Thus, it becomes possible by taking out data such as which packet ID is multiplexed.
[0023]
The AV decoder 4 includes a video decoder that decodes a video stream and an audio decoder that decodes an audio stream. The video decoder decodes the input variable length code to obtain a quantization coefficient and a motion vector, and performs inverse DCT conversion, motion compensation control based on the motion vector, and the like. The audio decoder decodes the input encoded signal to generate audio data. The video data generated by the decoding is output to the video processing circuit 5, and the audio data is output to the audio processing circuit 6.
[0024]
The video processing circuit 5 receives video data from the AV decoder 4 and performs D / A conversion, for example, to convert it into a composite video signal. The audio processing circuit 6 receives the audio data output from the AV decoder 4 and performs D / A conversion to generate, for example, a right (R) sound analog signal and a left (L) sound analog signal.
[0025]
The video output circuit 7 and the audio output circuit 8 include an output resistor, an amplifier, and the like. The AV output terminal 9 is provided with an output unit (a set of left and right audio output terminals and video output terminals, etc.). 16 is connected.
[0026]
The OSD circuit 12 outputs video data based on character information and color information instructed to be output from the CPU 13 to the adder 20. The adder 20 performs processing for incorporating the video data into the received video data output from the AV decoder 4. The OSD circuit 12 can perform EPG (Electronic Program Guide) display based on the program-related information received by the CPU 13.
[0027]
The remote control transmitter 10 is a transmitter for sending a command to the broadcast receiving device 30. When a key (not shown) provided on the remote control transmitter 10 is operated, signal light (remote control signal) indicating a command corresponding to the key is transmitted from a light emitting unit (not shown). The remote control light receiver 11 receives the signal light, converts it into an electric signal, and gives it to the CPU 13.
[0028]
The memory (RAM, EEPROM, flash memory, etc.) 14 stores received data (for example, service list, TS_ID, frequency, etc.) and execution date / time data of various processes in addition to program information for displaying an EPG screen. Is done.
[0029]
The CPU 13 performs overall control in the digital broadcast receiving apparatus 30. In particular, as control according to the present invention, generation / update of channel information by channel search is performed.
[0030]
FIG. 2 is a flowchart for explaining the channel search process of this embodiment. The initial channel search process will be described using this flowchart. The initial channel search is automatically executed, for example, when the receiving device 30 is turned on for the first time. For example, the CPU 13 uses the lowest frequency (for example, ch12) in the UHF band as the start frequency (step S1), and determines whether the frequency is a scan target frequency (step S2). In the initial channel search, all frequencies are to be scanned.
[0031]
The CPU 13 sets a frequency in the tuner 2 (step S3), and determines whether or not the broadcast has been received at the above-described frequency (the tuner 2 has locked the frequency) (step S4). If the broadcast can be received, the above-mentioned received data is acquired and stored in the memory 14 (step S6). Then, the current date and time is set as the last successful reception date and time of the channel (step S7). Further, the current date and time are set as the final tuning date and time of the channel (step S8), and the current date and time are set as the channel scan date and time of the channel (step S9). On the other hand, when the broadcast cannot be received, a time-out provided for reception check is determined in advance (step S5), and when it is time-out, the process proceeds to step S8, and only the final tuning date and time and channel scan date and time are obtained. Updated.
[0032]
The CPU 13 determines whether or not a channel deletion scan is being executed (step S10). If YES, a channel deletion process described later is executed (step S11). It is judged. Then, the CPU 11 determines whether or not the frequency being scanned is the final frequency (for example, ch 62) (step S12). If not, the CPU 11 increases the frequency (step S13) and returns to step S2. If it is determined that the final frequency is reached, the channel search is terminated.
[0033]
In the channel information generated in the initial channel search, the received data is stored for the channel that can receive the broadcast, and the channel scan date, the last tuning date, and the last successful reception date are stored in the memory 14. The On the other hand, for the channels that could not receive the broadcast, the reception data and the last successful reception date are not stored, but the channel scan date and the last tuning date are stored.
[0034]
In the re-channel search after the initial channel search (implemented when the receiving device is on standby, etc.), the CPU 13 selects (1) a channel deletion target, (2) a channel addition target, and (3) under a predetermined condition. It is classified into four categories that are not subject to channel update and (4). The scan target is selected in step S2 during the channel search process described in FIG. For the scan target (1), (2), and (3) above, the rechannel search interval (cycle) is made different, and the rechannel search is continuously performed during the stop time period. In order to prevent malfunctions due to, the re-channel search time zone varies.
[0035]
In the following description, the channel information illustrated in FIG. 3 is used, but for the sake of easy explanation, the “channel scan date”, “last tuning date”, and “last reception success date” in the channel information are time. Is omitted.
[0036]
(Channel deletion scan)
The channel deletion scan is for dealing with a channel whose broadcast frequency has been changed or stopped, and the channel whose channel information has the latest tuning date and time that is newer than the last reception date and time is the scan target (ch13 in FIG. 3). reference). In other words, a channel that could not be received at the last tuning date / time is a target channel for channel deletion scanning. Even if the information on the channel to be deleted remains as it is for a while, the inconvenience for the user is considered to be relatively small. Therefore, the channel search interval is set to be relatively long, for example, once every three days. A scan is to be executed.
[0037]
When the channel deletion scan is executed, YES is determined in step S10 in FIG. 2, and a channel deletion process is performed (step S11). In this channel deletion process, the deletion is performed when the scan is received, for example, five times as the target channel of the channel deletion scan. In performing the deletion, the date and time of the last successful reception is deleted, and after that, it becomes the target channel for the channel addition scan. Note that a condition that the difference between the last tuning date and the last reception date and time is 3 days or more may be added as a scan target condition.
[0038]
(Channel addition scan)
The channel addition scan is for coping with the opening of a new broadcasting station, the installation of a new relay station, and the like, and a channel having no last successful reception date and time is a scan target (see ch12 in FIG. 3). Although it is desirable to increase the scan frequency in order to appropriately cope with the addition of a new channel or the like, since it is considered that there are actually many channels that are not stationed, in this embodiment, a scan is executed once every two days, for example. I am doing so. When the channel targeted for scanning in this additional channel scan has received a stationed determination, the received data is acquired and stored, and the channel scan date and time, the last tuning date and time, and the last successful reception date and time are executed. Will be updated.
[0039]
(Channel update scan)
In the channel update scan, in order to update the received data, the channel with “final tuning date = last received date” is set as the scan target (see ch 14 in FIG. 3). Here, “the last tuning date and time = the last reception date and time, and the channel scan date and time is older than the relevant date and time, and for example, one day has not passed since the last tuning date and time is excluded from the scan target (see ch 15 in FIG. 3). This is because the channel has been successfully received by the user's channel selection since the last scan, and new information can be acquired at that time. On the other hand, the target channel of the channel update scan has not been received by the channel selection by the user since the previous scan, and new information has not been acquired. Therefore, such a channel is subject to a channel update scan, In example, it is set to be the highest priority as possible to run a scan once a day.
[0040]
FIG. 4 is a flowchart for explaining processing at the time of channel selection by the user. When the user starts a channel selection operation using the remote control transmitter 10, the CPU 13 checks the frequency of the channel instructed to select using the received data stored in the memory 14 (step S21). The CPU 13 sets a frequency in the tuner 2 (step S22), and determines whether or not the broadcast can be received at the above frequency (step S23). If the broadcast can be received, the received data is acquired and stored in the memory 14 (step S25). The current date and time are set as the last reception success date and time and the last tuning date and time of the channel (steps S26 and S27). If the broadcast cannot be received, a timeout provided for reception check is determined in advance (step S24), and if the timeout is reached, the process proceeds to step S27.
[0041]
In the scan process, there is no last successful reception date and time, and there is a case where a channel is opened by chance when the user selects a channel. Reception data is also acquired for such a channel, and various date and time are also updated. Will be. In the above processing, if the reception is OK, the channel can be a non-scan target channel, and if the reception is NG, the channel is a channel deletion scan target channel.
[0042]
As described above, in this embodiment, information such as “stationary / non-stationary information”, “channel scan date / time”, “last tuning date / time”, and “last reception success date / time” is stored in the memory 14 for each channel. Then, a channel satisfying a predetermined condition can be selected based on the information, and a channel search can be efficiently performed, and the search time can be shortened to reduce power consumption.
[0043]
In the above description, for each channel, the determination target channel is selected using information such as “channel scan date / time”, “last tuning date / time”, and “last reception success date / time”. Only the “last tuning date and time” may be stored, and a channel that has passed a predetermined period (for example, 2 days) from the last tuning date and time may be selected as a determination target channel. According to this, even when the user performs a receiving operation or the like during execution of the re-channel search and the re-channel search is interrupted, it is possible to prevent the channel that has already been subjected to the channel search from being repeatedly set as a determination target channel. it can. Also, when tuning is instructed by the user, the final tuning date and time is updated, so that a channel that has not passed a predetermined period from the tuning instruction can be excluded from search.
[0044]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain the latest reception data while minimizing the time required for the channel search.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a digital broadcast receiving apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating channel search processing according to this embodiment.
FIG. 3 is an explanatory diagram illustrating stationed / unstation information of each channel.
FIG. 4 is a flowchart showing processing at the time of channel selection by a user.
FIG. 5 is a flowchart showing a conventional channel search process.
[Explanation of symbols]
1 Antenna 2 Tuner 3 Demultiplexer (DEMUX)
4 AV decoder 12 OSD circuit 13 CPU
14 memory

Claims (9)

In a digital broadcast receiving apparatus that acquires NIT (Network Information Table) data provided for each channel and records it in a memory by performing a channel search, storage means for storing the last tuning date and time for each channel, and the last tuning date and time And a control means for performing channel search by selecting a channel that has passed for a predetermined period from the digital broadcast receiving apparatus 2. The digital broadcast receiving apparatus according to claim 1, wherein the final tuning date and time of a channel selection channel is stored even when channel selection is instructed by a user. In a digital broadcast receiver that acquires NIT (Network Information Table) data provided for each channel by performing a channel search and records it in memory, the channel search execution date and time, the last tuning date and time, and the last successful reception date and time for each channel And a storage means for storing, and a control means for selecting a channel to be searched based on the channel search execution date and time, the final tuning date and time, and the final reception success date and time , and performing a channel search. Broadcast receiving device. In the digital broadcast receiving apparatus according to claim 3, wherein the final tuning time and the a last successful reception date and the same, the final tuning time is newer than the channel search performed date, elapsed predetermined time period from the last tuning time A digital broadcast receiving apparatus configured to exclude channels that have not been searched from channels to be searched in a channel search . In the digital broadcast receiving apparatus according to claim 3, the channel the channel search performed date and the final tuning time and the last successful reception time is the same as update searched channel, the channel search performed date and the final tuning time And a digital broadcast receiving apparatus configured to perform channel search preferentially at a frequency of channel search as compared with channels having the same final reception success date and time . In the digital broadcast receiving apparatus according to claim 3, perform the channel search for the final tuning time to delete a channel the NIT data a new channel from the last successful reception time at a predetermined frequency is present in the memory , characterized in that for a plurality of times continue to channel the NIT data is subject to channel search for deleting a channel that exists in the memory that is configured to delete the NIT data of the channel from the memory A digital broadcast receiver. 4. The digital broadcast receiving apparatus according to claim 3, wherein a channel search is executed with a channel having no NIT data as an additional search target channel at a predetermined frequency , and when the NIT data is successfully received, the NIT of the channel is detected. A digital broadcast receiver configured to store data in the memory . The digital broadcast receiver according to any one of claims 3 to 7, wherein when the channel selection is instructed by a user, the final tuning date and time of the channel selection channel is recorded and the channel selection channel can be received. digital broadcast receiving apparatus when there, characterized in that it is configured to record the last successful reception time. In the digital broadcast receiving apparatus according to claim 8, the channel the NIT data is not in the case of successful reception of the NIT data in tuning by the user channel selection stores the NIT data of the channel in the memory A digital broadcast receiving apparatus configured as described above.

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