JP4665787B2 - Digital broadcast receiving apparatus, digital broadcast receiving method, program, and recording medium - Google Patents

Description

  The present invention relates to a receiving apparatus (international patent classification H04N 17/00) used for digital broadcasting.

  In December 2003, terrestrial digital broadcasting was started in three major cities. As reception channels, “terrestrial analog broadcasting”, “terrestrial digital broadcasting”, “BS digital broadcasting”, and “110-degree CS digital broadcasting” are supported. . Digital broadcasting receivers are becoming multi-channel and multi-functional, such as recording equipment control by LINK (IEEE 1394) and IrDA, and compatibility with interactive services using modems and LANs.

  On the other hand, there is a problem that a circuit for controlling these is required, and power consumption for supplying power to the circuit increases.

In reception of “terrestrial digital broadcasting”, as known in Japanese Patent Laid-Open No. 2004-364000, the level of the IF signal is detected, and the power supply to the digital demodulation circuit is stopped when viewing is impossible. In this way, power saving is achieved.
JP 2004-364000 A

  The conventional digital broadcast receiving apparatus always detects the level of the IF signal even when viewing is impossible. Therefore, it is necessary to always supply power to this detection part and supply unnecessary power. There was a problem.

In order to solve the above problems, the digital broadcast receiving apparatus of the present invention has no channel scanning means for scanning the presence / absence of a channel for digital terrestrial broadcasting based on a user instruction, and no channel capable of receiving the scan result of the channel scanning means. When the power is turned on, the storage means stores the fact that reception is not possible, and when it indicates that there is a receivable channel, the storage means stores the fact that reception is possible. Power supply means for stopping the power supply to the receiving circuit when it is stored, and for supplying power to the receiving circuit when it is stored that it can be received . Is.

As described above, the present invention starts power supply to a terrestrial digital broadcast receiving circuit at all times or periodically, determines that terrestrial digital broadcast reception is impossible, and controls power supply to the terrestrial digital broadcast receiving circuit. Therefore, if the terrestrial digital broadcast cannot be received due to the channel scan result of the terrestrial digital broadcast from the GUI, it is possible to stop the power supply to the terrestrial digital broadcast receiving circuit at all times. Thus, an excellent effect of reducing power consumption can be obtained.

  The present invention relates to a digital broadcast receiving apparatus for controlling power supply to a receiving circuit for terrestrial digital broadcasting, and means for scanning the presence / absence of a channel for terrestrial digital broadcasting, and means for determining the inability to receive terrestrial digital broadcasting based on the scan result The digital broadcast receiving device characterized in that the power consumption can be reduced by stopping the power supply to the receiving circuit of the terrestrial digital broadcast when reception of the terrestrial digital broadcast is impossible Have

(Embodiment 1)
FIG. 1 is a hardware block diagram of a digital broadcast receiving apparatus according to an embodiment of the present invention. Hereinafter, the configuration of the digital broadcast receiving apparatus will be described with reference to FIG.

  A tuner 101 that receives a signal selected by the user, an IF signal detector 102 that detects the presence or absence of a signal level, a demodulator 103 that demodulates the modulated signal, and a terrestrial ground comprising the tuner 101, the IF signal detector 102, and the demodulator 103. Digital broadcast receiving circuit 104, power control 105 for controlling power supply to the digital terrestrial broadcast receiving circuit 104, TS decoder 106 for separating demodulated signals into video / audio / additional information, separated video signal AV decoder 107 that decodes audio signals, Flash ROM 108 that is a storage device that stores programs and program information, RAM 109 that is a storage device that stores internal information of programs, user-specific information, and system setting information of a digital broadcast receiving device Store etc. EEPROM 111 as a storage device, infrared remote control signal transmission device 112 that transmits a remote control signal to an external device, infrared remote control reception device 113 that receives a remote control signal, and Ether control device 114 that performs a bidirectional service using a LAN. The IEEE 1394 control unit 115 performs control with an external device and transmits / receives data according to the IEEE 1394 standard, and the CPU 110 controls these devices through the system bus 100.

  Embodiment 1 of the present invention in the digital broadcast receiving apparatus having the above configuration will be described below using the processing flow of FIG.

  In step 21 in FIG. 2, the user activates a screen for performing channel scanning of terrestrial digital broadcasting. Next, in step 22 in FIG. 2, a channel scanning start state by a user operation is set.

  When the user starts the channel scan in step 22 in FIG. 2, the power control 105 in FIG. 1 is turned on in step 23 in FIG. 2, and power is supplied to the digital terrestrial broadcast receiving circuit 104 in FIG.

  Next, if the channel scan is not completed in step 24 of FIG. 2, the channel selection data of the next channel is set in the tuner 101 of FIG. 1 in step 25 of FIG.

  Next, in step 26 in FIG. 2, if the signal cannot be detected by the IF signal detection 102 in FIG. 1, the process proceeds to step 24 in FIG. 2 to scan the next channel, and if a signal can be detected, step 27 in FIG. 1 detects the presence or absence of synchronization of the demodulated signal by the demodulator 103. If there is no demodulation synchronization, the process proceeds to step 24 in FIG. 2 to scan the next channel. 2, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 106 in FIG. 1 is detected. If there is no TS synchronization, the process proceeds to step 24 in FIG. 2 to scan the next channel, and TS If there is synchronization, add this channel to the channel list as a receivable channel in step 29 of FIG. 2 and scan the next channel to scan the next channel. To transition to 4.

  Next, when the channel scan is completed in step 24 of FIG. 2, in order to determine whether or not digital terrestrial broadcasting can be received in step 210 of FIG. 2, reception is possible from the channel list to which the receivable channels are added in step 29 of FIG. If there is no such channel, it is determined that reception is impossible, and in step 211 in FIG. 2, the power control 105 in FIG. 1 is turned off, and the power supply to the digital terrestrial broadcast receiving circuit 104 in FIG. If there is at least one channel that can be received in the list, the power source control 105 in FIG.

(Embodiment 2)
The second embodiment of the present invention includes means for storing the determination result indicating that terrestrial digital broadcasting cannot be received in the first embodiment, and means for reading the determination result indicating that terrestrial digital broadcasting cannot be received when the power is turned on. The prepared point is different. Embodiment 2 of the present invention will be described below with reference to the processing flows of FIGS.

  In step 31 of FIG. 3, the user activates a screen for performing channel scanning of terrestrial digital broadcasting.

  Next, in step 32 of FIG. 3, a channel scanning start state by a user operation is set. When the user starts the channel scan in step 32 in FIG. 3, the power control 105 in FIG. 1 is turned on in step 33 in FIG. 3, and power is supplied to the digital terrestrial broadcast receiving circuit 104 in FIG.

  Next, if the channel scan is not completed in step 34 in FIG. 3, the channel selection data of the next channel is set in the tuner 101 in FIG. 1 in step 35 in FIG.

  Next, in step 36 in FIG. 3, if the signal cannot be detected by the IF signal detection 102 in FIG. 1, the process proceeds to step 34 in FIG. 3 to scan the next channel, and if a signal can be detected, step 37 in FIG. 1 detects the presence or absence of synchronization of the demodulated signal by the demodulator 103. If there is no demodulation synchronization, the process proceeds to step 34 in FIG. 3 to scan the next channel. 3, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 106 in FIG. 1 is detected. If there is no TS synchronization, the process proceeds to step 34 in FIG. 3 to scan the next channel. If there is synchronization, add this channel to the channel list as a receivable channel in step 39 of FIG. 3 and scan the next channel in FIG. To transition to 4.

  Next, when the channel scan is completed in step 34 in FIG. 3, it is possible to receive from the channel list in which the receivable channels are added in step 39 in FIG. If there is no such channel, it is judged that reception is impossible, and in step 311 in FIG. 3, the power control 105 in FIG. 1 is turned off, the power supply to the digital terrestrial broadcast receiving circuit 104 in FIG. In step 312 of FIG. 3, the fact that digital terrestrial broadcasting cannot be received is stored in the EEPROM 111 of FIG. 1 which is a storage device, and the channel scan processing is completed.

  If there is even one channel that can be received in the channel list in step 310 in FIG. 3, the power control 105 in FIG. 1 can be received and digital terrestrial broadcasting can be received in step 313 in FIG. Is stored in the EEPROM 111 of FIG. 1 as a storage device, and the channel scan processing is completed.

  Next, when the power is turned on, in step 41 of FIG. 4, the information indicating that reception of terrestrial digital broadcasting is not possible or is possible, which is stored in step 312 of FIG. 3 or step 313 of FIG.

  Next, in step 42 in FIG. 4, it is determined whether reception is impossible from the reception information of the digital terrestrial broadcast read in step 41 in FIG. 4. If reception is impossible, the power control 105 in FIG. 1 is turned off, the power supply to the digital terrestrial broadcast receiving circuit 104 in FIG. 1 is stopped, and if reception is possible, the power control 105 in FIG. 1 is turned on in step 44 in FIG. Power is supplied to the receiving circuit 104.

(Embodiment 3)
The third embodiment of the present invention is provided with means for storing a scan result of the presence / absence of a channel for digital terrestrial broadcasting in place of the means for storing the determination result of the reception failure of digital terrestrial broadcasting according to the second embodiment. Different. A third embodiment of the present invention will be described below with reference to the processing flows of FIGS.

  In step 51 of FIG. 5, the user activates a screen for performing channel scanning of terrestrial digital broadcasting.

  Next, in step 52 of FIG. 5, a channel scan start waiting state by a user operation is set. When the user starts the channel scan in step 52 in FIG. 5, the power control 105 in FIG. 1 is turned on in step 53 in FIG. 5, and power is supplied to the digital terrestrial broadcast receiving circuit 104 in FIG.

  Next, if the channel scan is not completed in step 54 in FIG. 5, the channel selection data of the next channel is set in the tuner 101 in FIG. 1 in step 55 in FIG. Next, in step 56 in FIG. 5, if the signal cannot be detected by the IF signal detection 102 in FIG. 1, the process proceeds to step 54 in FIG. 5 to scan the next channel, and if a signal can be detected, step 57 in FIG. 1 detects the presence or absence of synchronization of the demodulated signal by the demodulator 103. If there is no demodulation synchronization, the process proceeds to step 54 in FIG. 5 to scan the next channel. 5, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 106 in FIG. 1 is detected. If there is no TS synchronization, the process proceeds to step 54 in FIG. 5 to scan the next channel. If there is synchronization, add this channel to the channel list as a receivable channel in step 59 of FIG. 5 and scan the next channel in step 5 of FIG. To transition to 4.

  Next, when the channel scan is completed in step 54 of FIG. 5, in order to determine whether or not digital terrestrial broadcasting can be received in step 510 of FIG. If there is no such channel, it is determined that reception is impossible, and in step 511 in FIG. 5, the power control 105 in FIG. 1 is turned off, and the power supply to the digital terrestrial broadcast receiving circuit 104 in FIG. If there is even one channel that can be received in the list, the power control 105 in FIG. 1 remains powered on.

  Next, in step 512 of FIG. 5, a channel list in which the corresponding channel is added as a channel receivable in step 59 of FIG. 5 is stored in the EEPROM 111 of FIG. 1 as a storage device, and the channel scanning process is completed.

  Next, when the power is turned on, the channel list of digital terrestrial broadcasting stored in step 512 in FIG. 5 is read from the EEPROM 111 in FIG. 1 as a storage device in step 61 in FIG.

  Next, in step 62 of FIG. 6, in order to determine whether or not terrestrial digital broadcasting can be received, if there is no channel that can be received from the channel list of terrestrial digital broadcasting read out in step 61 of FIG. In step 63 of FIG. 6, the power control 105 of FIG. 1 is turned off, the power supply to the digital terrestrial broadcast receiving circuit 104 of FIG. 1 is stopped, and if there is at least one channel that can be received in the channel list, In step 64 of FIG. 6, the power control 105 of FIG. 1 is turned on to supply power to the digital terrestrial broadcast receiving circuit 104 of FIG.

(Embodiment 4)
The fourth embodiment of the present invention differs from the first embodiment described above in that it includes means for performing channel scanning of terrestrial digital broadcasting when the power is turned on. Embodiment 4 of the present invention will be described below using the processing flow of FIG.

  When the channel scan start is executed at step 71 in FIG. 7 when the power is turned on, the power control 105 in FIG. 1 is turned on in step 72 in FIG. 7, and the power is supplied to the terrestrial digital broadcast receiving circuit 104 in FIG. .

  Next, if the channel scan is not completed in step 73 in FIG. 7, the channel selection data of the next channel is set in the tuner 101 in FIG. 1 in step 74 in FIG.

  Next, in step 75 of FIG. 7, if the signal cannot be detected by the IF signal detection 102 of FIG. 1, the process proceeds to step 73 of FIG. 7 to scan the next channel, and if a signal can be detected, step 76 of FIG. 1 detects whether the demodulated signal is synchronized or not, and if there is no demodulated synchronization, the process proceeds to step 73 in FIG. 7 to scan the next channel. 7, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 106 in FIG. 1 is detected. If there is no TS synchronization, the process proceeds to step 73 in FIG. 7 to scan the next channel. If there is synchronization, add this channel to the channel list as a receivable channel in step 78 of FIG. 7 and scan the next channel to scan the next channel. To transition to 3. Next, when the channel scan is completed in step 73 of FIG. 7, in order to determine whether or not digital terrestrial broadcasting can be received in step 79 of FIG. 7, reception is possible from the channel list to which channels receivable in step 78 of FIG. If there is no such channel, it is determined that reception is impossible, and in step 710 in FIG. 7, the power control 105 in FIG. 1 is turned off, and the power supply to the digital terrestrial broadcast receiving circuit 104 in FIG. If there is at least one channel that can be received in the list, the power source control 105 in FIG.

(Embodiment 5)
The fifth embodiment of the present invention differs from the second embodiment described above in that it includes means for performing channel scanning of terrestrial digital broadcasting when the power is turned off. Embodiment 5 of the present invention will be described below using the processing flow of FIG.

  When the channel scan start is executed at step 81 in FIG. 8 when the power is turned on, the power control 105 in FIG. 1 is turned on in step 82 in FIG. .

  Next, if the channel scan is not completed in step 83 in FIG. 8, the channel selection data of the next channel is set in the tuner 101 in FIG. 1 in step 84 in FIG.

  Next, in step 85 in FIG. 8, if the signal cannot be detected by the IF signal detection 102 in FIG. 1, the process proceeds to step 83 in FIG. 8 to scan the next channel, and if a signal can be detected, step 86 in FIG. 1 detects the presence or absence of synchronization of the demodulated signal by the demodulator 103. If there is no demodulation synchronization, the process proceeds to step 83 in FIG. 8 to scan the next channel. 8, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 106 in FIG. 1 is detected. If there is no TS synchronization, the process proceeds to step 83 in FIG. 8 to scan the next channel. If there is synchronization, add this channel to the channel list as a receivable channel in step 88 of FIG. 8 and scan the next channel to scan the next channel. To transition to 3.

  Next, when the channel scan is completed in step 83 of FIG. 8, in order to determine whether or not digital terrestrial broadcasting can be received in step 89 of FIG. 8, reception is possible from the channel list added with the receivable channels in step 88 of FIG. If there is no such channel, it is determined that reception is impossible. In step 810 of FIG. 8, the power control 105 of FIG. 1 is turned off, and the power supply to the digital terrestrial broadcast receiving circuit 104 of FIG. In step 811 of FIG. 8, the fact that digital terrestrial broadcasting cannot be received is stored in the EEPROM 111 of FIG. 1 which is a storage device, and the channel scan processing is terminated.

  Further, if there is at least one channel that can be received in the channel list in step 89 in FIG. 8, the power control 105 in FIG. 1 can be received and digital terrestrial broadcasting can be received in step 812 in FIG. Is stored in the EEPROM 111 of FIG. 1 as a storage device, and the channel scan processing is completed. The process at power-on is the same as the process at power-on in the second embodiment.

(Embodiment 6)
The sixth embodiment of the present invention is different from the third embodiment described above in that it includes means for performing channel scanning of terrestrial digital broadcasting when the power is turned off. Embodiment 6 of the present invention will be described below using the processing flow of FIG.

  When the channel scan start is executed at step 91 in FIG. 9 when the power is turned on, the power control 105 in FIG. 1 is turned on in step 92 in FIG. 9 to supply power to the digital terrestrial broadcast receiving circuit 104 in FIG. .

  Next, if the channel scan is not completed in step 93 in FIG. 9, the channel selection data for the next channel is set in the tuner 101 in FIG. 1 in step 94 in FIG.

  Next, in step 95 in FIG. 9, if the signal cannot be detected by the IF signal detection 102 in FIG. 1, the process proceeds to step 93 in FIG. 9 to scan the next channel, and if a signal can be detected, step 96 in FIG. 1 detects whether the demodulated signal is synchronized or not, and if there is no demodulated synchronization, the process proceeds to step 93 in FIG. 9 to scan the next channel. 9, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 106 in FIG. 1 is detected. If there is no TS synchronization, the process proceeds to step 93 in FIG. 9 to scan the next channel. If there is synchronization, add this channel to the channel list as a receivable channel in step 98 of FIG. 9 and scan the next channel in FIG. 9 to scan the next channel. To transition to 3.

  Next, when the channel scan is completed at step 93 in FIG. 9, in order to determine whether or not digital terrestrial broadcasting can be received at step 99 in FIG. If there is no such channel, it is determined that reception is impossible, and in step 910 in FIG. 9, the power control 105 in FIG. 1 is turned off, and the power supply to the digital terrestrial broadcast receiving circuit 104 in FIG. If there is even one channel that can be received in the list, the power control 105 in FIG. 1 remains powered on.

  Next, in step 911 in FIG. 9, a channel list in which the corresponding channel is added as a channel receivable in step 98 in FIG. 5 is stored in the EEPROM 111 in FIG. 1 as a storage device, and the channel scanning process is completed. The process at power-on is the same as the process at power-on in the third embodiment.

  In the second embodiment, the third embodiment, the fifth embodiment, and the sixth embodiment, the information is stored in the “EEPROM”, but the “Flash ROM” may be used.

  The present invention is not limited to the embodiment described above.

  As described above, the functions in the best mode for carrying out the present invention are realized by a predetermined program, and this is recorded on a recording medium such as an FD and transferred, so that it can be easily executed by another independent computer system. In the product, the program is written in a built-in memory, and can be operated by the user with a hard key or a remote controller of the receiving apparatus.

  The power control method in the digital broadcast receiving apparatus of the present invention makes it possible to always stop the power supply to the digital terrestrial broadcast receiving circuit when the reception of the terrestrial digital broadcast is impossible. It has the effect of reducing power and is useful as a receiving device used for digital broadcasting.

Hardware block diagram of a digital broadcast receiver in an embodiment of the present invention The flowchart which shows the process of the digital broadcast receiver in Embodiment 1 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 2 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 2 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 3 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 3 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 4 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 5 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 6 of this invention.

Explanation of symbols

100 system bus 101 tuner
102 IF Signal Detection 103 Demodulator 104 Terrestrial Digital Broadcasting Reception Circuit 105 Power Supply Control 106 TSDecoder
107 AVDecoder
108 FlashROM
109 RAM
110 CPU
111 EEPROM
112 Infrared Remote Control Transmitter 113 Infrared Remote Control Receiver 114 Ether Controller 115 IEEE 1394 Controller

Claims (4)

Channel scanning means for scanning the presence / absence of a digital terrestrial broadcast channel based on a user instruction;
When the scan result of the channel scanning means indicates that there is no receivable channel, it stores that reception is not possible, and when it indicates that there is a receivable channel, it stores that it can be received. Means,
When the storage means stores that reception is not possible at the next power-on, the power supply to the reception circuit is stopped, and when it is stored that reception is possible, Power control means for supplying power;
A digital broadcast receiving apparatus. A channel scanning step for scanning the presence / absence of a digital terrestrial broadcast channel based on a user instruction;
When the scan result of the channel scan step indicates that there is no receivable channel, it is stored that the reception is not possible, and when it indicates that there is a receivable channel, it is stored that the reception is possible. Steps,
When the memory step stores that reception is not possible at the next power-on, the power supply to the reception circuit is stopped, and when it is stored that reception is possible, A power control step for supplying power; and
A digital broadcast receiving method. Channel scanning means for scanning the presence / absence of a digital terrestrial broadcast channel based on a user's instruction;
When the scan result of the channel scanning means indicates that there is no receivable channel, it stores that reception is impossible, and when it indicates that there is a receivable channel, it stores that it can be received. means,
When the storage means stores that reception is not possible at the next power-on, the power supply to the reception circuit is stopped, and when it is stored that reception is possible, A program for functioning as power control means for supplying power. Channel scanning means for scanning the presence / absence of a digital terrestrial broadcast channel based on a user's instruction;
When the scan result of the channel scanning means indicates that there is no receivable channel, it stores that reception is impossible, and when it indicates that there is a receivable channel, it stores that it can be received. means,
When the storage means stores that reception is not possible at the next power-on, the power supply to the reception circuit is stopped, and when it is stored that reception is possible, A computer-readable recording medium having recorded thereon a program for causing it to function as power supply control means for supplying power.

Images