JP3789875B2 - 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 perform an initial channel search as an initial setting when the receiving apparatus is installed, and to acquire stationed / unstationed information of each channel. In addition, even after initial setting, in order to cope with the opening of a new broadcasting station, installation of a new relay station, or change of broadcasting frequency, etc., re-channel search is often performed using non-viewing time such as standby. Is desirable.
[0004]
Note that, as a conventional broadcast receiving apparatus that performs channel search, there is an apparatus that performs channel search in parallel in two CPUs in charge of analog broadcasting and digital broadcasting (see Patent Document 1). The 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. Also, 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. In the case where there is a channel that has not been re-searched, it is generally known that, for example, a newly provided channel is present, compared with a case where a receivable channel is left unreceivable. It is considered that it is more disadvantageous for the user not to be done.
[0005]
[Patent Document 1]
JP-A-2002-171453 [0006]
[Problems to be solved by the invention]
By the way, when a channel that has been received (stationary) until now becomes unreceivable by another channel search, the channel is abandoned only when it happens to be stopped. (No station). Here, if this channel search immediately determines that this channel is no-station after only one reception failure determination, it may happen that a channel that happened to stop is erroneously determined to be no-station. .
[0007]
In view of the above circumstances, the present invention is information indicating whether each channel is a stationed channel or a stationless channel as it is determined that this channel (a channel that was stationed) is immediately unattended in a single reception failure determination. It is an object of the present invention to provide a digital broadcast receiving apparatus that can prevent the broadcast from being updated .
[0008]
[0009]
[0010]
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, the digital broadcast receiving apparatus of the present invention is configured to determine whether or not each channel can be received by channel search , and information indicating whether each channel is a channeled channel or a channelless channel. Storing means for storing, a means for counting up a reception impossible counter when a reception impossible determination is continued in a plurality of re- channel searches performed for a channel determined to be stationed once, and a reception impossible counter Re-determination means for determining that the channel is a non-stationary channel when the value of the number exceeds a predetermined number, and information indicating whether each channel is a channeled channel or a channelless channel when it is determined that the channel is a non-stationary channel And updating means for updating.
[0012]
In the above-mentioned configuration, only the information immediately to each channel as the channel (Yes station in a channel) is a non-station channel indicating whether Yukyoku channel or Mukyoku channels in one unreceivable updated Can be prevented.
[0013]
The means for counting up may be configured to count up the reception disabled counter even when it is determined that the channel received by the channel selection instruction by the user is not received . Further, the means for counting up may be configured to count up the reception disabled counter only when reception disabled occurs in different time zones.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIG. 1 to FIG. 3, but 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 showing update processing of stationed / unstationary information for each channel, and FIG. 3 is a stationed station for each channel. FIG. 6 is an explanatory diagram illustrating no-station information.
[0015]
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.
[0016]
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.
[0017]
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 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.
[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 an input encoded signal to obtain a quantization coefficient and a motion vector, and performs inverse DCT transformation, 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.
[0019]
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.
[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 video output terminals), and a monitor 16 having a CRT 16a and a speaker 16b by a video / audio code 17 is provided in this output unit. Connected.
[0021]
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.
[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, 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.
[0023]
The memory (RAM, EEPROM, flash memory, etc.) 14 stores program-related information for displaying an EPG screen and the like, and stationed / unstationary information of each channel, which will be described later.
[0024]
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 stationed / unstationary information of each channel by channel search is performed. Yes. 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 apparatus 30 or installation after moving.
[0025]
FIG. 2 is a flowchart showing the stationed / unstationed information acquisition / update process for each channel. In the initial process, the CPU 13 executes an initialization process of the reception enable / disable information of each channel and a reset process of a reception disable counter provided for each channel (step S1). For example, channel search processing is started in ascending order of frequency, and information about each channel is stored in the memory 14 (step S2). At this time, to produce a distinguishing identification information and receivable channels and unreceivable channels (e.g., markings on unreceivable channels). An example of the reception enable / disable information of each channel generated in the initial processing is shown in FIG. In this example, there are 10 channels from ch13 to ch22, but the check items are marked because ch13, ch17, ch20, and ch21 are not received by the initial channel search process described above, and each channel is marked. It shows that the provided unreceivable counter is set to zero. Channels for which the check items have been marked because they were not received by the initial channel search process are treated as non-stationary channels, and channels that were not marked are treated as stationed channels (that is, reception is not possible). The marking is also information indicating whether each channel is a channeled channel or a channelless channel).
[0026]
When the CPU 13 determines that the television is OFF (standby state) (YES in step S3), the CPU 13 executes a re-channel search. In this re-channel search, a scan is performed for ch13, which is the first channel marked in the check item indicating that reception is not possible in the information indicating whether or not each channel can be received (step S4). If broadcast cannot be received on this channel, the process proceeds to step S7. If received (determined as stationed), the reception disable marking corresponding to ch13 of the reception enable / disable information of each channel is removed. (Step S6). In step S7, it is determined whether this channel is the last unreceivable channel in the receivable / unreceivable information (step S7). In the above case, since ch13 is not the last channel, the next unreceivable channel ch17 is scanned (step S8), and the process returns to step S5 and continues.
[0027]
When the above-described determination processing is completed for all unreceivable channels (YES in step S7), the next channel (ch14) that is the receivable (stationary) channel is scanned (step S9). If it has not been possible to receive the broadcast ch14 (NO in step S10), and the organic station determination process and the current chromatic station determination process of the last time the channel is judged to be unreceivable is, same time It is determined whether or not the band has been implemented (step S11). The standard of the time zone may be a method corresponding to a time zone such as midnight or dawn, or a method of equally dividing one day into four time zones (6 hours each). If it is determined that it is the same time period as the previous process, the process proceeds to step S16 (ignoring that reception is not possible), and if it is determined that it is not the same time period, a reception impossibility 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, the process proceeds to step S16. If the reception disabled counter is 3, marking is performed on the reception disabled check item corresponding to ch14, the reception disabled counter is reset (step S14), and the process proceeds to step S16. As a result, only the channels that have received the no-station determination three times in different time zones are updated as no-station channels.
[0028]
If the broadcast can be received on ch14 (YES in step S10), the reception disable counter for this channel is reset (step S15). Then, it is determined whether or not this channel is the last receivable channel in the receivability information (step S16). In the above case, since ch 14 is not the last channel, the next receivable channel ch 15 is scanned (step S 17), and the process returns to step S 10 and continues. When the above-described determination process is completed for all receivable channels (YES in step S16), the receiving apparatus 30 waits for a predetermined time (step S18), and proceeds to a TV OFF determination process (step S3).
[0029]
As described above, in the re-channel search, it is determined whether or not the channel is preferentially given to the channel that is not receivable (no station) in the receivable / non- receivable information of each channel. Even when stations are opened or channels of existing broadcasting stations are changed, these channels can be detected early. In addition, for a channel that has been determined to be stationed, the information indicating whether each channel is a stationed channel or a stationless channel is updated to be stationless (cannot be received) only when the reception disabled state continues for a predetermined number of times. Since this is done, it is possible to prevent the information indicating whether each channel is a stationed channel or a stationless channel from being updated as soon as this channel is not stationed immediately after a single reception failure determination. . Furthermore, for example, even if a channel search is executed at 3:00 am for several consecutive days and a no-station determination is received each time, the reception impossibility determination made in the same time zone as the previous determination is not considered. In addition, even if the user repeats the channel selection instruction for a stopped channel in a short time, it is in the same time zone and the reception impossible determination is not considered. It can be surely prevented.
[0030]
In the above description, the reception disable counter is counted up for a channel that is determined to be unreceivable by channel scanning. However, broadcasts could not be received on that channel during the channel selection operation by the user. In this case, the reception disable counter for the corresponding channel may be counted up. Of course, it is preferable to perform the same time zone determination process also in this case.
[0031]
Also, for example, if the channel / stationary information update processing for each channel is interrupted by turning on the TV by a user operation, for example, the processing at the time of interruption is for a non-receivable channel (from step S4 to step S8). When the TV is turned off next time, the CPU 13 resumes the process from the non-stationary channel at the time of interruption, and the process at the time of interruption is for a receivable channel (from step S9). In the case where the process of step S17 has been executed), it is preferable to start the process from the first channel (step S4) of the unreceivable channel, not from the interruption point.
[0032]
【The invention's effect】
As described above, according to the present invention, only one single of each channel or Yukyoku channel as it is no station channel (channel was closed station) immediately the channel reception determination impossible or Mukyoku channel it can be information indicating to prevent updating.
[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 showing a stationed / unstationary information update process for each channel.
FIG. 3 is an explanatory diagram illustrating stationed / unstationed 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 (2)

About determination means for determining whether each channel can be received or not by channel search, storage means for storing information indicating whether each channel is a stationed channel or a non-stationary channel, and a channel once determined to be stationed A means for counting up the reception disable counter when the reception disable determination is continued in a plurality of re-channel searches performed thereafter, and a non-stationary channel is determined when the value of the reception disable counter exceeds a predetermined number Re-determination means, and update means for updating information indicating whether each channel is a stationed channel or a non-station channel when it is determined that the channel is a no-station channel, and the means for counting up comprises , characterized in that it counts up the unreceivable counter only when the unreceivable judgment occurred at different times Ijitaru broadcast receiver.   2. The digital broadcast receiving apparatus according to claim 1, wherein said means for counting up counts up a reception impossible counter even when it is determined that a channel received in response to a channel selection instruction by a user cannot be received. A digital broadcast receiver.

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