JP3989487B2 - Television receiver - Google Patents

Description

  The present invention relates to a television receiver, and particularly receives, for example, a digital broadcast and a terrestrial broadcast including a channel for displaying an image on a display like a normal broadcast and a channel not displaying an image on a display like a data broadcast. The present invention relates to a television receiver.

  Digital broadcasting includes a normal broadcast channel that broadcasts both video and audio, a radio broadcast channel that broadcasts only audio, and a data broadcast channel that broadcasts data such as computer programs. Therefore, when a television receiver that receives a digital broadcast selects a normal broadcast channel, video and audio are output from the display and the speaker, respectively. When a radio broadcast channel is selected, audio is output from the speaker and a data broadcast is received. Then, data was output from the communication port (interface) to, for example, a personal computer.

  In such a television receiver, if the display is turned on while receiving a radio broadcast or a data broadcast, useless power is consumed.

  Therefore, a main object of the present invention is to provide a television receiver capable of preventing waste of electric power.

A television receiver according to the present invention sets / cancels an analog reception mode for receiving only an analog broadcast in a television receiver including a first receiving means for receiving a digital broadcast and a second receiving means for receiving an analog broadcast. Mode switching means for manually switching, discriminating means for discriminating setting / canceling of the analog reception mode in response to a power-on operation, first receiving means and second when the discriminating means discriminates that the analog reception mode has been released A power-on means for always turning on both power supplies of the receiving means, and a power supply of the first receiving means is always turned off and a power supply of the second receiving means is always turned on when it is determined by the determining means that the analog reception mode is set. Power supply off / on means for turning on is provided.
The digital broadcast is received by the first receiving means, and the analog broadcast is received by the second receiving means. The setting / canceling of the analog mode is manually switched by the mode switching unit, and the state of the analog reception mode is determined by the determination unit in response to the power-on operation. When it is determined by the determining means that the analog reception mode has been released, the power-on means always turns on both the first receiving means and the second receiving means. On the other hand, when it is determined by the determining means that the analog reception mode is set, the power off / on means always turns off the power of the first receiving means and always turns on the power of the second receiving means.

According to this invention, it is possible to prevent the consumption of wasted power.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  Referring to FIG. 1, a television receiver 10 of this embodiment includes an antenna 12 for receiving a terrestrial broadcast and an antenna 14 for receiving a CS (Communication Satellite) broadcast. The terrestrial broadcast signal received by the antenna 12 is applied to a terrestrial tuner 20 included in the terrestrial receiver circuit 16, whereby a broadcast signal of a desired channel is selected, and the IF signal of the channel is converted to an IF demodulator circuit 22. Is demodulated. On the other hand, the CS broadcast signal received by the antenna 14 is applied to the CS tuner 26 shown in FIG. It is processed. The MPEG decoder 34 generates audio data and video data based on the output from the demultiplexer 32. The audio data is converted into an analog audio signal by the audio D / A converter 36, and the video data is converted into an NTSC format video signal (luminance signal and color difference signal) by the NTSC encoder 38.

  In addition to the normal broadcast channel that broadcasts both video and audio simultaneously, CS broadcast is provided with a radio broadcast channel that broadcasts only audio and a data broadcast channel that broadcasts data such as computer programs. When the channel 26 selects a data broadcast channel, data included in the channel is output from the descrambler 30 to the personal computer 42 via the interface 40. When the CS tuner receives the radio broadcast channel, only the audio data is output from the MPEG decoder 34.

  The video signal processing circuit 24 included in the video output circuit 44 receives the color video signal demodulated by the IF demodulation circuit 22 and generates a luminance signal and a color difference signal. The switch 48 selects either the luminance signal and the color difference signal from the video signal processing circuit 24 and the luminance signal and the color difference signal from the CS digital circuit 18 and supplies them to the color signal reproduction circuit 50. The RGB signal reproduced by the color signal reproduction circuit 50 is deflected by the deflection circuit 54 in the CRT 52 to which a high voltage is applied by the high voltage circuit 56, whereby a desired image is displayed.

  On the other hand, the audio signal demodulated by the IF demodulation circuit 22 is processed by the audio signal processing circuit 58 and then given to the switch 60. The switch 60 selects either the audio signal from the audio signal processing circuit 58 or the audio signal from the CS digital circuit 18 and applies it to the speaker 62. Therefore, the sound of terrestrial broadcasting or CS broadcasting is output from the speaker 62.

  When the outlet 80 is connected to the power source and the main switch 78 is turned on, power is supplied to the microcomputer 64 via the power circuit 76. At this time, as shown in FIG. 3, when the remote control transmitter 74 having various keys is operated, the remote control light receiver 72 receives the infrared signal from the remote control transmitter 74 and the key input data is included in the microcomputer circuit 64. The data is supplied to a system control microcomputer (syscon microcomputer) 66 and a tuning microcomputer 68. The syscon microcomputer 66 turns on / off the switches SW1 to SW4 in accordance with a key input signal or broadcast mode information sent from the tuning microcomputer 68 via the bus 70. The channel selection microcomputer 68 selects a desired channel according to the key input signal and the flag information from the system controller microcomputer 66.

  Specifically, the syscon microcomputer 66 processes the flowchart shown in FIG. 4, and the tuning microcomputer processes the flowcharts shown in FIGS. First, referring to FIG. 4, the syscon microcomputer 66 determines whether or not the power key 74a shown in FIG. 3 has been operated in step S1, and if “YES”, whether or not the interlock flag 66a is set in step S5. If it is determined and set, the switches SW1 to SW4 are turned on in step S7, and all the terrestrial wave reception circuit 16, CS digital circuit 18, video output circuit 44 and audio output circuit 46 are activated. On the other hand, if the CS flag 66a has been reset, only the switches SW2 to SW4 are turned on in step S9, and the supply of power to the CS digital circuit 18 is stopped. That is, if the interlock flag 66a is set, the supply of power to the CS digital circuit 18 is turned on / off in conjunction with the operation of the power key 74a. The interlock flag 66a is reset by a user's remote control operation when the user does not use the CS broadcast. When the process of step S7 or S9 is completed, flag information indicating whether or not the interlocking flag 66a is set to the tuning microcomputer 68 is output in step S11.

  Turning to FIG. 5, the channel selection microcomputer 68 determines whether or not flag information is input from the system controller microcomputer 66 in step S31. If “YES” here, the previous channel, that is, the CS broadcast channel or the terrestrial broadcast channel that was selected when the power was turned off last time is selected in step S33, and then the interlock flag 66a is selected in step S35. Determine if is set. If “NO” here, the user proceeds to step S37 not to use the CS broadcast. In this step, it is determined whether or not there has been a key operation. If “YES”, it is determined in step S39 whether or not it is an operation of the menu key 74c. If “YES” here, the menu process is performed in step S41 and the process returns to step S37. If “NO”, it is determined whether or not the key operated in step S43 is the numeric key 74f. If “YES”, the reception processing of the desired terrestrial broadcast channel is performed according to the numeric key in step S45, and the process returns to step S37. If “NO”, the key operation in step S37 selects the terrestrial broadcast channel. Assuming that the station is irrelevant, no processing is performed and the process returns to step S37.

  On the other hand, if “YES” is determined in the step S35, the same processing as the steps S37 to S45 is performed in the steps S47 to S55, and if “NO” is determined in the step S53, the processing of the steps S57 to S65 is performed. Then, the process returns to step S47. That is, if “NO” in the step S53, it is determined whether or not the CS key 74b and the numeric key 74f are operated in each of the steps S57 and S59. If any of them is “NO”, the process returns to the step S47. If both are “YES”, a desired CS broadcast channel is selected in accordance with the operation in step S61. In step S63, the broadcast mode of the selected channel is determined, that is, whether the selected channel is a normal broadcast channel, a radio broadcast channel, or a data broadcast channel. In step S65, the determination result ( Broadcast mode information) is output to the syscon microcomputer 66, and the process returns to step S47.

  In steps S41 and S51, the tuning microcomputer 68 processes the subroutine shown in FIG. That is, first, a menu screen is displayed on the display 82 as shown in FIG. 8 in step S70, and it is determined whether or not a key operation has been performed in step S72. If “YES” here, it is determined whether or not the operated key is the cursor key 74d in a step S74, and if “YES”, it is displayed on the display 82 in accordance with the operation of the cursor key 74d in a step S76. Move the cursor up / down and return to step S72. On the other hand, if “NO” in the step S74, it is determined whether or not the operated key is the decision key 74e in a step S78. If “NO”, the key operation is invalidated and the process returns to the step S72. If "YES", it is determined in step S80 whether or not the cursor points to (1) of the menu displayed on the display 82. If “YES”, the user uses the CS broadcast, and the interlock flag 66a is set and returned in step S82. If “NO” in the step S80, the user does not use the CS broadcast. In step S84, the interlocking flag 66a is reset and the process returns.

  Returning to FIG. 4, the syscon microcomputer 66 determines whether broadcast mode information is input from the tuning microcomputer 68 in step S <b> 13. If “NO” here, it is determined whether or not the power key 74a is operated in step S15. If “NO”, the process returns to step S13. If “YES”, the terrestrial receiver circuit 16 is determined in step S27. , The supply of power to the CS digital circuit 18, the video output circuit 44, and the audio output circuit 46 is stopped, and the process ends. On the other hand, if it is determined in step S13 that the broadcast mode information has been input, it is determined in step S17 whether the CS broadcast channel selected by the tuning microcomputer 68 is a normal broadcast channel. If “YES”, the video output circuit 44 and the audio output circuit 46 are activated by turning on the switches SW3 and SW4 in step S19, and the process returns to step S13. On the other hand, if “NO” in the step S17, it is determined whether or not the selected CS broadcast channel is a radio broadcast channel in a step S21. If “YES” here, since only the sound is broadcast, the switch SW4 is turned off, and the process returns to the step S13. If “NO” in the step S21, it is determined that the received broadcast is a data broadcast, and both the switches SW3 and SW4 are turned off in a step S25, and the process returns to the step S13.

  Thus, if the CS flag 66a is reset, the syscon microcomputer 66 stops supplying power to the CS digital circuit 18 that is not used by the user. Even when the CS flag 66a is set, if the selected CS broadcast channel is a radio broadcast channel, the power supply to the video output circuit 44 is stopped, and the selected CS broadcast channel is the data. If it is a broadcast channel, the supply of power to both the video output circuit 44 and the audio output circuit 46 is stopped. Therefore, power is supplied only to necessary circuits, and wasteful power consumption can be prevented.

  Incidentally, about 20 W of power can be saved by turning off the power of the CS digital circuit 18, and about 100 W of power can be saved by turning off the power of the video output circuit 44 (CRT 52).

It is a block diagram which shows one Example of this invention. 2 is a block diagram showing a CS digital circuit 18. FIG. It is an illustration figure which shows a remote control transmitter. It is a flowchart which shows the process of a syscon microcomputer. It is a flowchart which shows a part of operation | movement of a channel selection microcomputer. It is a flowchart which shows the other part of operation | movement of a channel selection microcomputer. It is a flowchart which shows the other part of operation | movement of a channel selection microcomputer. It is an illustration figure which shows the menu displayed on a display.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Television receiver 16 ... Terrestrial wave receiving circuit 18 ... CS digital circuit 44 ... Video output circuit 46 ... Audio | voice output circuit 64 ... Microcomputer circuit

Claims (1)

In a television receiver comprising first receiving means for receiving a digital broadcast and second receiving means for receiving an analog broadcast,
Mode switching means for manually switching setting / canceling of the analog reception mode for receiving only the analog broadcast;
Determining means for determining setting / cancellation of the analog reception mode in response to a power-on operation;
Power-on means for always turning on both the first receiving means and the second receiving means when it is determined by the determining means that the analog reception mode is released; and
And a power off / on means for always turning off the power of the first receiving means and always turning on the power of the second receiving means when the judging means determines that the analog reception mode is set. A featured television receiver .

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