JP2005198040A - Digital broadcasting receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fetch program data effectively and stably in a digital broadcasting receiver which is capable of receiving of a plurality of digital broadcasting. <P>SOLUTION: The digital broadcasting receiving apparatus 20 has two digital broadcasting reception systems: a BS/CS digital broadcasting reception system which includes a BS/CS tuner 2, a TS decoder 3, and an AV decoder 4 and can receive the BS/CS digital broadcasting and a digital terrestrial broadcasting reception system which includes a terrestrial tuner 6, a TS decoder 7, and an AV decoder 8 and can receive digital terrestrial broadcasting. The digital broadcasting receiving apparatus 20 is provided with a C/N value comparison part (reception situation evaluating part ) 21 for receiving inputs of reception C/N values from the respective reception systems to compare the reception C/N values. Then, by using the reception system for digital broadcasting whose reception status has been evaluated to be better than the other by the C/N value comparison part, program data are fetched. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a digital broadcast receiving apparatus capable of receiving a digital broadcast, and more particularly, downloads program data included in a digital broadcast signal, downloads update program data included in a digital broadcast signal, and performs digital broadcast. The present invention relates to a digital broadcast receiving apparatus capable of updating program data stored in the receiving apparatus.

  A conventional digital broadcast receiving apparatus will be described with reference to FIG. FIG. 3 is a block diagram showing an outline of a configuration of a digital broadcast receiving apparatus for receiving a digital broadcast in the prior art. The digital broadcast receiver 16 includes a BS (Broadcast Satellite) / CS (Communication Satellite) tuner 2, a TS (Tranport Stream) decoder 3, and an AV (Audio / Video) decoder 4. , Terrestrial tuner 6, TS decoder 7, AV decoder 8, switch 9, system controller 12, memory 13, program storage unit 14, display control unit 15, BS / CS antenna 1, terrestrial antenna 5, A monitor 10 and an operation input unit 11 are connected.

  Hereinafter, processing of the BS / CS digital broadcast receiving system which is one of the input systems of the digital broadcast receiving apparatus 16 shown in FIG. 3 will be described. Broadcast waves from the BS or CS received by the BS / CS antenna 1 installed at a predetermined position are supplied to the BS / CS tuner 2 of the digital broadcast receiver 16. In the BS / CS tuner 2, a received transponder switching process based on the received intermediate frequency signal, a baseband signal acquisition process by a demodulation process and an error correction process of the received signal, and the like are performed on the supplied broadcast wave, The processed signal is supplied to the TS decoder 3 as a transport stream. The TS decoder 3 extracts a packet corresponding to necessary video and audio from the transport stream supplied from the BS / CS tuner 2 and also extracts a packet for multiplexed information of the multiplexed program and channel. It also has a function as an extraction unit.

  The packet corresponding to the video and audio extracted by the TS decoder 3 is supplied to the AV decoder 4 and reproduced and output as an analog video and audio signal by the AV decoder 4. Switching is performed, and the analog video and audio signals are supplied to the monitor 10 and displayed on the monitor 10.

  On the other hand, packets for additional information of programs and channels extracted by the TS decoder 3 are taken into the memory 13 under the control of the system controller 12. The information captured in the memory 13 is processed according to the user's key operation input by the operation input unit 11. That is, the content of the key operation input from the operation input unit 11 is interpreted by the system controller 12. For example, when a key such as viewing a program guide is pressed, the information stored in the memory 13 is stored. Predetermined information is read out, developed into display image data by the display control unit 15, added to the output of analog video and audio signals from the switch 9, and displayed on the monitor 10. In addition, when the data extracted by the TS decoder 3 is program data that operates in the digital broadcast receiver 16, the program data is taken into the memory 13 and then stored in the program storage unit 14 through a predetermined process. The When the program data is new program data, the program data is stored as it is in the program storage unit 14, while when the program data is update program data, it is already stored in the program storage unit 14. Program data is updated.

  Next, processing of a terrestrial digital broadcast receiving system which is another input system of the digital broadcast receiving apparatus 16 shown in FIG. 3 will be described. The broadcast wave from the terrestrial transmission antenna received by the terrestrial antenna 5 installed at a predetermined position is supplied to the terrestrial tuner 6 of the digital broadcast receiver 16. The processing in the terrestrial tuner 6, TS decoder 7, and AV decoder 8 is almost the same as the processing in the BS / CS tuner 2, TS decoder 3, and AV decoder 4 of the BS / CS wave receiving system described above. That is, the packet corresponding to the video and audio extracted by the TS decoder 7 is displayed on the monitor 10 through the processing by the AV decoder 8, while the packet for the additional information of the program or channel extracted by the TS decoder 7. Are captured by the memory 13 and then displayed superimposed on the monitor 10 in accordance with a user operation. The program data is stored in the program storage unit 14 through a predetermined process.

  As described above, the digital broadcast receiving device 16 capable of receiving and reproducing both BS / CS digital broadcast and terrestrial digital broadcast is for the digital broadcast receiving device 16 supplied via the two digital broadcasts. Program data can be received and stored by almost the same mechanism. Such a digital broadcast receiving device 16 is disclosed in, for example, the following Patent Document 1 and Patent Document 2.

  Further, the operation of the digital broadcast receiving apparatus 16 shown in FIG. 3 will be described with reference to FIG. FIG. 4 is a flowchart for explaining the operation of the digital broadcast receiving apparatus shown in FIG. Note that the flowchart shown in FIG. 4 shows processing related to execution of a control program by the system controller 12. First, the control program of the system controller 12 detects whether or not program data for the own digital broadcast receiving device 16 is transmitted in the terrestrial digital broadcast (step S401). Also, here, when it is detected that program data is being transmitted, whether or not the version of the program data is a version to be acquired, the current received C / N value (Carrier to Noise Ratio: It is also confirmed whether or not the carrier power to noise power ratio is at a level that can withstand data acquisition. As a result, if it is determined that the program data is to be received, the program data is fetched (step S403), and then the acquired program data is checked for errors (step S405). If necessary, error correction processing is performed simultaneously with the above error check. As a result, for example, when there is an error and the error cannot be recovered, the process returns to step S401 and the above process is repeated again. On the other hand, when there is no error or error can be recovered. In step S407, the fetched program data is written in the program storage unit 14 (step S407), and the process ends.

  On the other hand, if it is determined in step S401 that program data has not been sent, or program data that need not be acquired is sent based on version information of the program data, for example, BS / The CS digital broadcast wave is processed in the same manner as described above, and it is detected whether or not program data for the own digital broadcast receiver 16 is transmitted in the BS / CS digital broadcast (step S409). As a result, if it is determined that the program data is to be received, the program data is taken in (step S411) in the same manner as the processing related to the terrestrial digital broadcasting (steps S403 to S407), and then An error check is performed on the acquired program data (step S413). If there is no error or error recovery is possible, the fetched program data is written in the program storage unit 14 (step S415), and the process is as follows. End. If it is determined in step S409 that program data has not been sent, or program data that need not be acquired is sent based on version information of the program data, for example, or there is an error. However, when the recovery cannot be performed, the process returns to step S401 again and the above-described processing is repeated.

Patent Document 3 below discloses a digital broadcast receiving apparatus that determines whether to acquire (download) program data based on a received C / N value in digital broadcasting. According to the technique disclosed in Patent Document 3, when new program data is detected, the reception C / N value is calculated from the bit error rate, the reception C / N value is larger than a predetermined value, and the reception status is Only when it is satisfactory, it is possible to fetch program data.
JP 2002-319871 (FIG. 1) Japanese Patent Laid-Open No. 11-4451 (FIGS. 1 and 3) JP-A-10-257453 (FIG. 1)

  However, for example, the conventional digital broadcast receiving devices disclosed in Patent Literature 1 and Patent Literature 2 are configured to preferentially capture program data that can be received at that time. That is, even when program data is sent from both BS / CS digital broadcasting and terrestrial digital broadcasting, for example, when the program data from BS / CS digital broadcasting is received by chance first. The digital broadcast receiving apparatus fetches program data from the BS / CS digital broadcast, and similarly, when the program data from the terrestrial digital broadcast is received first by chance, the digital broadcast receiving apparatus The program data is configured to be taken in from terrestrial digital broadcasting. Therefore, if the received C / N value of the broadcast that happens to be imported is relatively poor compared to the other broadcast and the program data acquisition fails during reception, it is necessary to perform the acquisition again from the beginning. There is a problem that it is not efficient in operation.

  Further, in the conventional digital broadcast receiving apparatus disclosed in Patent Document 3, when the reception C / N value is equal to or less than a predetermined value, program data is not downloaded. In a digital broadcast receiver installed in a poor location, it is difficult to download program data or to set the above predetermined value according to the installation environment of each digital broadcast receiver There is a problem of doing.

  In order to solve the above problems, the present invention provides a digital broadcast receiving apparatus capable of receiving program data efficiently and stably in a digital broadcast receiving apparatus capable of receiving a plurality of digital broadcasts. For the purpose.

  In order to achieve the above object, the present invention evaluates a reception situation including a reception C / N value and automatically selects a digital broadcast with a good reception situation from a plurality of digital broadcasts based on the evaluation result. The program data included in the digital broadcast signal of the digital broadcast is acquired.

That is, in order to achieve the above object, according to the present invention, a digital broadcast receiving apparatus capable of receiving a plurality of digital broadcasts,
A plurality of tuners for receiving the plurality of digital broadcasts;
A plurality of reception status detecting means for detecting a reception status according to each of the plurality of digital broadcasts;
A plurality of program extraction means for extracting program data contained in digital broadcast signals received by each of the plurality of tuners;
Program storage means for storing program data extracted by the plurality of program extraction means;
Reception status evaluation means for evaluating the reception status of each of the plurality of digital broadcasts detected by each of the plurality of reception status detection means;
Broadcast type selection means for selecting the digital broadcast evaluated as the best reception status by the reception status evaluation means,
Program acquisition control means for performing control of taking in the program data so that the program data included in the digital broadcast signal of the digital broadcast selected by the broadcast type selection means is stored in the program storage means,
A digital broadcast receiving apparatus is provided.

  The digital broadcast receiving apparatus of the present invention is capable of selecting a digital broadcast signal related to a digital broadcast in an optimal reception situation from a plurality of digital broadcasts and capturing program data included in the digital broadcast signal. The program data can be fetched efficiently and stably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an outline of a configuration of a digital broadcast receiving apparatus for receiving a digital broadcast in the present invention. The digital broadcast receiver 20 shown in FIG. 1 has a C / N value comparison unit (reception status evaluation unit) 21 in addition to the configuration of the conventional digital broadcast receiver 16 shown in FIG. Based on the comparison result supplied from the C / N value comparison unit 21, the system controller 12 selects program data transmitted from a digital broadcast with a good reception C / N value from among a plurality of digital broadcasts. It is configured so that it can be selectively captured.

  For example, bit errors that can be acquired when the TS decoders 3 and 7 related to a plurality of digital broadcast reception systems (here, BS / CS digital broadcast reception system and terrestrial digital broadcast reception system) perform error correction. The received C / N value in each broadcast wave is calculated from the rate, and this received C / N value is supplied to the C / N value comparison unit 21. The C / N value comparison unit 21 obtains the received C / N value related to the BS / CS digital broadcast supplied from the TS decoder 3 and the received C / N value related to the terrestrial digital broadcast supplied from the TS decoder 7. Compared to information related to digital broadcasting with a high received C / N value (information indicating which received C / N value related to BS / CS digital broadcasting and received C / N value related to terrestrial digital broadcasting is higher) ) To the system controller 12. The system controller 12 selects a receiving system so as to fetch program data from a broadcast wave of a digital broadcast having a high reception C / N value, based on information relating to the digital broadcast having a high reception C / N value. Thus, it is possible to selectively fetch program data transmitted from a digital broadcast having a high received C / N value. That is, the system controller 12 stores a function as a broadcast selection unit that selects a digital broadcast evaluated to have the best reception status and program data included in the digital broadcast signal of the selected digital broadcast in the program storage unit 14. It also has a function as a program acquisition control unit that controls to be taken in.

  The C / N value comparison unit 21 shown in FIG. 1 can also be realized by the system controller 12, and the system controller 12 can perform processing for calculating the received C / N value from the bit error rate. It is. Furthermore, the control program executable by the system controller 12 realizes the received C / N value comparison process in the C / N value comparison unit 21 and the process of calculating the received C / N value from the bit error rate. Is also possible. In addition, FIG. 1 illustrates the case where the TS decoders 3 and 7 have a function as a reception status detection unit for digital broadcasting using the received C / N value. However, the bit error rate value is used as it is. It is also possible to detect the reception status by using the S / N ratio. In FIG. 1, two digital broadcasts, BS / CS digital broadcast and terrestrial digital broadcast, are given as examples. However, other digital broadcasts can be used, and many more. It is also possible to evaluate the reception status of digital broadcasts of three types (three or more types). As an evaluation method in this case, for example, the reception statuses of a plurality of digital broadcasts are compared with each other, and the one with the best reception status is selected, or a score is assigned to each reception status of a plurality of digital broadcasts ( It is possible to select the one with the best score.

  Next, the operation of the digital broadcast receiving apparatus 20 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a flowchart for explaining the operation of the digital broadcast receiving apparatus shown in FIG. First, the control program of the system controller 12 detects whether or not program data for the own digital broadcast receiving device 20 is transmitted in the terrestrial digital broadcast (step S201). Furthermore, it is detected whether program data for the own digital broadcast receiver 20 is transmitted in the BS / CS digital broadcast regardless of whether the program data is transmitted in the terrestrial digital broadcast. (Steps S203 and S205).

  As a result, when the program data is transmitted in the terrestrial digital broadcast and the program data is transmitted in the BS / CS digital broadcast (“Yes” in step S201 and “Yes” in step S205). : This case is referred to as the first case), when the program data is transmitted in the terrestrial digital broadcast and the program data is not transmitted in the BS / CS digital broadcast ("Yes" in step S201) If “NO” in step S205: this case is referred to as the second case), the program data is not transmitted in the terrestrial digital broadcast, and the program data is transmitted in the BS / CS digital broadcast. ("No" in step S201, "Yes" in step S205: this case is called the third case) ), When the program data is not transmitted in the terrestrial digital broadcast and the program data is not transmitted in the BS / CS digital broadcast (“No” in step S201, “No” in step S205) : This case is called the fourth case).

  In the first case described above, program data is transmitted in both terrestrial digital broadcasting and BS / CS digital broadcasting. In this case, the C / N value comparison unit 21 compares the received C / N value of the terrestrial digital broadcast with the received C / N value of the BS / CS digital broadcast (step S207), and If the reception C / N value is relatively high, it is evaluated that the reception status of the terrestrial digital broadcast is better, and the process proceeds to step S209. On the other hand, if the received C / N value of the BS / CS digital broadcast is relatively high, it is evaluated that the reception status of the BS / CS digital broadcast is better, and the process proceeds to step S215.

  In the second case described above, the program data is transmitted only in the terrestrial digital broadcast, and the process proceeds to step S209 to take in the program transmitted in the terrestrial digital broadcast. In the third case described above, the program data is transmitted only within the BS / CS digital broadcast, and the process proceeds to step S215 to take in the program transmitted via the BS / CS digital broadcast. In the fourth case, program data is not transmitted in both terrestrial digital broadcasting and BS / CS digital broadcasting, and the process returns to step S201.

  In the first case described above, when the reception situation of the terrestrial digital broadcast is evaluated to be better, or in the second case described above, the digital broadcast receiving device 20 is transmitted from the terrestrial digital broadcast. The program data is taken in (step S209), and then the acquired program data is checked for errors (step S211). If necessary, error correction processing is performed simultaneously with the above error check. As a result, for example, if there is an error and the error cannot be recovered, the process returns to step S201 and the above processing is repeated again. On the other hand, if there is no error or the error can be recovered In this case, the fetched program data is written in the program storage unit 14 (step S213), and the process is terminated.

  On the other hand, in the first case described above, in the case where the reception status of the BS / CS digital broadcast is evaluated to be better in step S207, or in the third case described above, the digital broadcast receiving device 20 The program data transmitted from the / CS digital broadcast is taken in (step S215), and then the obtained program data is checked for errors (step S217). If necessary, error correction processing is performed simultaneously with the above error check. As a result, for example, when there is an error and the error cannot be recovered, the process returns to step S201 and the above process is repeated again. On the other hand, when there is no error or the error can be recovered In step S219, the fetched program data is written in the program storage unit 14 (step S219), and the process ends.

  In the above-described embodiment, the digital broadcast receiving apparatus 20 is configured to always select a digital broadcast with good reception status and capture program data. For example, from the operation input unit 11 by the user, It is also possible to set any one of the digital broadcasts by inputting. When such a setting is performed by the user, the digital broadcast receiving apparatus 20 takes in only program data transmitted from the digital broadcast set by the user.

  The digital broadcast receiving apparatus of the present invention evaluates the reception status including the reception C / N value, etc., and automatically selects a digital broadcast with a good reception status from a plurality of digital broadcasts based on the evaluation result. A technology of a digital broadcast receiving apparatus capable of receiving digital broadcasts by selecting and capturing program data contained in a digital broadcast signal of the digital broadcast efficiently and stably. Applies to the field.

It is a block diagram which shows the outline of a structure of the digital broadcast receiver for receiving the digital broadcast in this invention. It is a flowchart for demonstrating operation | movement of the digital broadcast receiver shown in FIG. It is a block diagram which shows the outline of a structure of the digital broadcast receiver for receiving the digital broadcast in a prior art. It is a flowchart for demonstrating operation | movement of the digital broadcast receiver shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 BS / CS antenna 2 BS / CS tuner 3, 7 TS decoder 4, 8 AV decoder 5 Terrestrial antenna 6 Terrestrial tuner 9 Switch 10 Monitor 11 Operation input part 12 System controller 13 Memory 14 Program storage part 15 Display control part 16 20 Digital broadcast receiver 21 C / N value comparison unit (reception status evaluation unit)

Claims (1)

A digital broadcast receiver capable of receiving a plurality of digital broadcasts,
A plurality of tuners for receiving the plurality of digital broadcasts;
A plurality of reception status detecting means for detecting a reception status according to each of the plurality of digital broadcasts;
A plurality of program extraction means for extracting program data contained in digital broadcast signals received by each of the plurality of tuners;
Program storage means for storing program data extracted by the plurality of program extraction means;
Reception status evaluation means for evaluating the reception status of each of the plurality of digital broadcasts detected by each of the plurality of reception status detection means;
Broadcast type selection means for selecting the digital broadcast evaluated as the best reception status by the reception status evaluation means,
Program acquisition control means for performing control of taking in the program data so that the program data included in the digital broadcast signal of the digital broadcast selected by the broadcast type selection means is stored in the program storage means,
A digital broadcast receiving apparatus.

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