JP2004112621A - Digital broadcast receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiving device for giving convenience to a user by performing an efficient channel search. <P>SOLUTION: A CPU 13 performs an initial channel search as an initial setting and generates station information or non-station information on each channel. In a re-channel search after the initial channel search (performed during OFF of television), the presence/absence of station is decided by preferentially receiving channels in which the absence of the station is decided, that is, the presence/absence of station is determined for all the channels in which the absence of station is decided. When this decision processing is completed, next the presence/absence of station is decided for receivable (station present) channels. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a digital broadcast receiving device for receiving digital broadcast.
[0002]
[Prior art]
A digital broadcast receiving device that receives digital broadcasts using satellites and terrestrial waves selects an arbitrary broadcast wave from a plurality of broadcast waves received through a dedicated antenna or a terrestrial antenna with a tuner, and selects the selected broadcast wave. An arbitrary channel is selected from a plurality of channels included in the wave by demultiplex processing, a digital signal of the selected channel is extracted, and a video / audio signal is output by decoding the digital signal.
[0003]
In particular, in a receiving apparatus that receives terrestrial digital broadcasting, it is desirable to execute an initial channel search as initial setting when the receiving apparatus is installed, and to acquire stationed / unstationed information of each channel. In addition, even after the initial setting, in order to cope with the opening of a new broadcasting station, the setting of a new relay station, or the change of the broadcasting frequency, a re-channel search is frequently performed using a non-viewing state such as a standby state. It is desirable.
[0004]
As a conventional broadcast receiving apparatus that performs a channel search, there is a broadcast receiving apparatus that performs a channel search in parallel by two CPUs that are in charge of analog broadcasting and digital broadcasting, respectively (see Patent Document 1).
[0005]
[Patent Document 1]
JP 2002-171453 A
[Problems to be solved by the invention]
By the way, the channel search usually requires several tens of minutes depending on conditions, and the program cannot be viewed during the initial channel search, and it is necessary to wait for the channel search to end. . If the user performs a reception operation or the like at the time of the re-channel search, the search is interrupted, and in this case, there are channels that have not been re-searched. In the case where there is a channel that has not been searched again, generally, for example, the presence of a newly provided channel is compared with the case where a receivable channel is left unreceivable. It is considered that not being done is disadvantageous for the user.
[0007]
The present invention has been made in view of the above circumstances, and has as its object to provide a digital broadcast receiving apparatus capable of performing an efficient channel search and providing a benefit to a user.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a digital broadcast receiving apparatus according to the present invention has a determination unit for determining whether or not each channel is occupied by a channel search, and a storage unit for storing occupied / unoccupied information of each channel. And control means for preferentially receiving the stationless channel in the new channel search and making the judgment by the judging means, and updating means for updating the stationed / stationless information when it is judged that the station is stationed. , Is provided.
[0009]
With the above-described configuration, in the new channel search, whether or not a station has been broadcast or not is determined by giving priority to the stationless channel. Therefore, a new broadcasting station is opened or the broadcasting frequency of an existing broadcasting station is changed. In such a case, these channels can be detected early.
[0010]
When a new channel search is interrupted, if the channel to be determined at the time of interruption is an abandoned channel, the processing is resumed from the abandoned channel at the next new channel search, and the channel to be determined at the time of interruption If is a station channel, it is preferable that the processing is restarted from the first station channel in the next new channel search.
[0011]
Further, the digital broadcast receiving apparatus of the present invention is a determination means for determining the presence / absence of each channel by a channel search, a storage means for storing the presence / absence information of each channel, and once once. Means for counting up the number of stationless channel judgments when the stationless channel judgment is continued in a new plurality of channel searches for the channel judged as, and stationless when the number of stationless channel judgments exceeds a predetermined number. It is characterized by comprising re-determining means for determining a channel, and updating means for updating the presence / absence information when it is determined that there is no channel.
[0012]
With the above-described configuration, it is possible to prevent the channel / non-station information from being updated as soon as the channel is determined to be station-free by only one station-stop determination.
[0013]
The configuration may be such that the number of stationless channel determinations is also counted up when it is determined that the channel received by the user in response to the channel selection instruction is a stationless channel. Further, the configuration may be such that the number of times of the stationless channel determination is counted up only when the stationless channel determination occurs in different time zones.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. Here, a case where a user watches digital terrestrial broadcasting is illustrated. FIG. 1 is a block diagram showing a digital broadcast receiving apparatus 30 according to this embodiment. FIG. 2 is a flowchart showing an update process of the station / non-station information of each channel. FIG. FIG. 9 is an explanatory diagram illustrating non-station information.
[0015]
In FIG. 1, an antenna 1 is arranged outdoors in a predetermined direction, and receives a digital broadcast signal transmitted from a terrestrial broadcast station.
[0016]
The tuner 2 extracts a signal of a specific frequency from high-frequency digital modulation signals including video and audio data. Further, the tuner 2 includes a demodulation circuit, a deinterleave circuit, an error correction circuit, and the like, and thereby demodulates the selected digital modulation signal and outputs a transport stream.
[0017]
A demultiplexer (DEMUX) 3 separates the transport stream into a video stream of MPEG2 (Moving Picture Experts Group2), an audio stream, a 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 and the like included in the PSI / SI to the CPU 13. As described above, a plurality of channels are multiplexed in the transport stream, and a process for selecting an arbitrary channel from among the channels is performed by selecting an arbitrary channel from the PSI / SI in the transport stream. It becomes possible by extracting data such as which packet ID is multiplexed.
[0018]
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 coded signal to obtain a quantization coefficient and a motion vector, and performs inverse DCT transform, motion compensation control based on the motion vector, and the like. The audio decoder decodes the input coded 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.
[0019]
The video processing circuit 5 receives the video data from the AV decoder 4, performs D / A conversion, and converts the data into, for example, a composite video signal. The audio processing circuit 6 receives the audio data output from the AV decoder 4, performs D / A conversion, and generates, for example, a right (R) sound analog signal and a left (L) sound analog signal.
[0020]
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 a video output terminal and the like). The output unit includes a monitor 16 having a CRT 16a and a speaker 16b by a video / audio code 17. Connected.
[0021]
The OSD circuit 12 outputs to the adder 20 video data based on the character information and color information instructed by the CPU 13 to output. The adder 20 performs a process of incorporating the video data into the received video data output from the AV decoder 4. The OSD circuit 12 can display an EPG (Electronic Program Guide) based on the program-related information received by the CPU 13.
[0022]
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, a 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 the signal light into an electric signal, and supplies the electric signal to the CPU 13.
[0023]
The memory (RAM, EEPROM, flash memory, etc.) 14 stores program-related information for displaying an EPG screen and the like, as well as information on whether or not each channel will be described later.
[0024]
The CPU 13 performs the overall control of the digital broadcast receiving apparatus 30. In particular, as the control according to the present invention, the CPU 13 performs generation / update of the bureau / unburst information of each channel by a channel search. I have. The initial channel search is executed, for example, when the user operates the remote control transmitter 10 and selects “initial channel search” from the menu items displayed on the screen. The user selects “initial channel search” at the time of purchase installation of the receiving device 30 or at the time of installation after moving.
[0025]
FIG. 2 is a flowchart showing the process of acquiring / updating station / unstation information for each channel. In the initial process, the CPU 13 executes the process of initializing the station / non-station information of each channel and the process of resetting the reception disabled counter provided for each channel (step S1). Then, for example, the channel search process is started in the order of lower frequencies, and information on each channel is stored in the memory 14 (step S2). At this time, identification information for discriminating between the tentative channel and the non-station channel is generated (for example, marking is performed on a non-receivable (non-station) channel). FIG. 3 shows an example of the station / non-station information of each channel generated in the initial processing. In this example, there are 10 channels from ch13 to ch22, but since the above-mentioned initial channel search processing has made ch13, ch17, ch20, and ch21 unreceivable, the check items are marked, and each channel is marked. This indicates that the provided reception disabled counter is set to 0.
[0026]
When determining that the television is OFF (standby state) (YES in step S3), CPU 13 executes a re-channel search. In this re-channel search, a scan is performed for ch13, which is the first channel marked with a check item that cannot be received in the station / non-station information of each channel (step S4). If the broadcast has not been received on this channel, the process proceeds to step S7. If the broadcast has been received (it has been determined that the station is broadcast), the reception impossible marking corresponding to ch13 of the broadcast / unburst information of each channel is set. It is removed (step S6). In step S7, it is determined whether or not this channel is the last unreceivable channel in the station / unstation information (step S7). In the above case, since ch13 is not the last channel, scanning is performed for ch17, which is the next unreceivable channel (step S8), and the process returns to step S5 to continue.
[0027]
When the above-described determination processing is completed for all unreceivable channels (YES in step S7), ch14, which is the first of receivable (organized) channels, is scanned (step S9). If the broadcast cannot be received on ch14 (NO in step S10), the previous station determination processing in which the channel is determined to be unstationed and the current station determination processing are performed at the same time. It is determined whether or not the operation has been performed on the band (step S11). The standard of the time zone may be a division method corresponding to a time zone such as midnight or dawn, or a method of equally dividing a day into four time zones (6 hours each). If it is determined that the reception is in the same time zone as the previous processing, the process proceeds to step S16 (ignoring that the reception is disabled), and if it is determined that the reception is not in the same time, the reception disabled counter corresponding to ch14 Is counted up (step S12). The CPU 13 determines whether or not the reception impossible counter is 3, for example (step S13), and if not, proceeds to step S16. If the unreceivable counter is 3, marking is performed on the unreceivable check item corresponding to ch14, and the unreceivable counter is reset (step S14), and the process proceeds to step S16. As a result, only the channels that have received the no-station decision three times consecutively in different time zones are updated as the no-station channels.
[0028]
If the broadcast can be received on ch14 (YES in step S10), the reception disabled counter of this channel is reset (step S15). Then, it is determined whether or not this channel is the last receivable channel in the station / unstation information (step S16). In the above case, since ch14 is not the last channel, scanning is performed for ch15, which is the next receivable channel (step S17), and the process returns to step S10 and continues. When the above-described determination processing is completed for all receivable channels (YES in step S16), receiving apparatus 30 waits for a fixed time (step S18), and proceeds to television OFF determination processing (step S3).
[0029]
As described above, in the re-channel search, a determination is made as to whether or not a channel is unreceivable (un-station) in the station / un-station information of each channel by prioritizing the channel. Even when a broadcasting station is opened or a channel of an existing broadcasting station is changed, these channels can be detected early. In addition, for a channel once determined to be occupied, only when the unreceivable state continues for a predetermined number of times, the update of the occupied / unoccupied information to be unoccupied is performed. As a result, it is possible to prevent the channel / unburst information from being updated as soon as the channel is assumed to be abandon. Furthermore, for example, even if a channel search is performed at 3:00 am for several consecutive days and an abandonment determination is made each time, an abandonment determination performed in the same time zone as the previous determination is not considered. Further, even if the user repeatedly issues a channel selection instruction in a short period of time for a channel in which a wave is stopped, since the same time zone is not used and the no-station determination is not taken into account, an erroneous determination of no-station caused by the stop can be made. It can be reliably prevented.
[0030]
In the above description, the unreceivable counter is counted up for the channel determined to be unreceivable by the channel scan, but the broadcast cannot be received on the channel during the channel selection operation by the user. Also in this case, the reception disabled counter of the corresponding channel may be counted up. Of course, in this case, it is preferable to perform the same time zone determination processing.
[0031]
Also, if the update of the terrestrial / unbursted information of each channel is interrupted, for example, by turning on the television by a user's operation, etc., the process at the time of interruption is directed to the unreceivable channel (steps S4 to S8). When the television is turned off next, the CPU 13 resumes the processing from the station-free channel at the time of interruption, and the processing at the time of interruption targets a receivable channel (from step S9). If the processing of step S17 has been executed), it is preferable to start the processing from the first non-receivable channel (step S4), not from the interruption point.
[0032]
【The invention's effect】
As described above, according to the present invention, in a new channel search, whether a station is unoccupied or not is determined by giving priority to an unassigned channel. When the frequency is changed, these channels can be detected early. In addition, it is possible to prevent the channel / non-station information from being updated as soon as the channel is determined to be station-free by only one station-stop determination.
[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 flow chart showing a station / unstation information update process of each channel.
FIG. 3 is an explanatory diagram exemplifying station / non-station information of each channel;
[Explanation of symbols]
1 antenna 2 tuner 3 demultiplexer (DEMUX)
4 AV decoder 12 OSD circuit 13 CPU
14 memory

Claims (5)

Determining means for determining whether or not each channel is occupied or not by a channel search; storage means for storing occupied / unoccupied information of each channel; A digital broadcast receiving apparatus, comprising: a control unit for making a determination by a determination unit; and an updating unit for updating, when it is determined that a station is occupied, the station / unstation information. 2. The digital broadcast receiving apparatus according to claim 1, wherein when the new channel search is interrupted, when the channel to be determined at the time of the interruption is an stationless channel, the next new channel search is performed at the time of the interruption. Digital broadcasting reception, characterized in that the processing is resumed from the above, and when the channel to be determined at the time of interruption is a station channel, the processing is restarted from the first stationless channel in the next new channel search. apparatus. Determining means for determining whether or not each channel is occupied or not by a channel search; storage means for storing occupied / unoccupied information of each channel; and a plurality of new times for a channel once determined to be occupied. Means for counting up the number of stationless channel determinations when the stationless channel determination is continuous in the channel search, and redetermining means for determining that the station is a stationless channel when the number of stationless channel determinations exceeds a predetermined number; A digital broadcast receiving apparatus comprising: updating means for updating station / non-station information when it is determined that the station is non-station. 4. The digital broadcast receiving apparatus according to claim 3, wherein the number of times of channel-free channel determination is counted up even when it is determined that a channel received by a user's channel selection instruction is a channel-less channel. Digital broadcast receiver. 5. The digital broadcast receiving apparatus according to claim 3, wherein the number of times of the station-less channel determination is counted up only when the station-less channel determination occurs in a different time zone. Receiver.

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