JP2011223642A - Digital broadcast receiver and receiving method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce unnecessary power consumption for a portable digital broadcast receiver when a mode for outputting only video or a mode for outputting only audio is selected.SOLUTION: The digital broadcast receiver comprises: a digital reception demodulation section 51, a video image decoding section 52, a display device 6, an audio decoding section 53, a speaker or earphone 9, an operation section 10, and a control section 11. When an audio mode for reproducing only audio is selected through the operation section 10, the operation of the video image decoding section 52 and the display device 6 is stopped, and when a video mode for reproducing only video is selected, the operation of the audio decoding section 53 is stopped. Thus, unnecessary operation of processing circuits can be prevented in accordance with a user's viewing form, thereby reducing power consumption, which is a major issue for a portable digital broadcast receiver.

Description

  The present invention relates to a portable receiver for digital terrestrial broadcasting.

  Some conventional television broadcast receivers have an audio mode function that reproduces only audio, and when an audio mode is selected, there is an apparatus that suppresses power consumption by controlling the video display device (for example, patents). Reference 1). FIG. 9 is a block diagram showing the structure of the television receiver described in Patent Document 1. In FIG.

  In FIG. 9, when the user selects a sound mode using the remote controller 101, a remote control signal is input to the remote control light receiving unit 102, and a sound mode selection signal is output from the remote control light receiving unit 102 to the CPU 103. The CPU 103 outputs a deflection high voltage off signal for stopping the deflection operation and the high pressure control operation of the deflection high voltage circuit 109 to the deflection high voltage control circuit 105 in accordance with the audio mode selection signal. The deflection high voltage control circuit 105 stops the deflection operation and the high voltage generation operation of the deflection high voltage circuit 109, and no image is displayed on the CRT 113 screen.

JP-A-7-107405 (page 3-4, FIG. 1)

  In battery-powered portable digital broadcast receivers, it is a major issue to suppress power consumption as much as possible.

  Unlike a fixed digital broadcast receiving device, a portable digital broadcast receiving device is often used by a user while walking or traveling on a transportation vehicle. In such a usage mode, a situation where the user does not look at the screen or a situation where the sound is muted occurs, such as when moving by changing the vehicle. Displaying images on the screen and outputting sound under these circumstances is not preferable from the viewpoint of power consumption.

  Therefore, not only normal reception but also an audio mode for decoding only audio and a video mode for decoding only video are provided.

  However, in the conventional method, the video processing circuit operates only by stopping display on the CRT when the audio mode is selected, and the audio processing circuit operates even when the sound is muted. The power consumption in the video processing circuit and the audio processing circuit is not so small as to be negligible in a portable digital broadcast receiving apparatus, and becomes large as the video / audio quality becomes high. Wasted power was consumed by operating the audio processing circuit.

  Also, when mode switching is provided, the mode of use changes from moment to moment, so it is necessary to simplify this switching operation.

  In the present invention, according to the user's preference, power consumption is suppressed by stopping / restarting the operation of each circuit by operating means such as an audio mode, a video mode, and a normal mode that normally outputs audio and video. An object is to provide an easy-to-use portable digital broadcast receiver by providing various modes and simplifying the mode switching operation.

  In order to solve the above-described conventional problems, a first portable digital broadcast receiving apparatus includes a digital reception demodulation unit that receives and demodulates a desired broadcast wave, and a video decoding unit that reproduces a video signal from the output of the digital reception demodulation unit A video display device that displays the output of the video decoding unit, an audio decoding unit that reproduces an audio signal from the output of the digital reception demodulation unit, an audio presentation device that outputs the output of the audio decoding unit, It consists of an operation unit for setting video display, a digital reception demodulation unit, a video decoding unit, and a control unit for controlling the operation of the video display device, and this control unit reproduces only audio by the operation unit. When selected, control is performed so as to stop the operations of the video decoding unit and the video display device.

  If the portable digital broadcast receiving apparatus has such a configuration, it is possible to stop the operation of the video decoding unit and the video display device and reproduce only the audio, and unnecessary processing according to the user's viewing mode. The operation of the circuit can be stopped and power consumption, which is one of the major problems in the portable digital broadcast receiver, can be suppressed.

  The second portable digital broadcast receiver includes a digital reception demodulator that receives and demodulates a desired broadcast wave, a video decoder that reproduces a video signal from the output of the digital reception demodulator, and an output of the video decoder A video display device that displays the audio signal, an audio decoding unit that reproduces an audio signal from the output of the digital reception demodulation unit, an audio presentation device that outputs the output of the audio decoding unit, and an operation unit that sets the display of the digital broadcast video And a digital reception demodulation unit, a video decoding unit, and a control unit that controls the operation of the video display device. When the control unit is selected to reproduce only the audio, Control is performed so that the operation of the decoding unit is stopped, and control is performed so that a standby image is displayed on the video display device.

  If the portable digital broadcast receiving apparatus has such a configuration, it is possible to stop the operation of the video decoding unit, display a standby screen on the video display device, and reproduce only the audio, and match the user's viewing mode. Thus, unnecessary operation of the processing circuit can be stopped and power consumption, which is one of the major problems in the portable digital broadcast receiver, can be suppressed. In addition, by displaying the standby screen, it is possible to display information such as necessary date and time and broadcast channel with minimum power consumption.

  The third portable digital broadcast receiver includes a digital reception demodulator that receives and demodulates a desired broadcast wave, a video decoder that reproduces a video signal from the output of the digital reception demodulator, and an output of the video decoder A video display device for displaying an audio signal, an audio decoding unit for reproducing an audio signal from the output of the digital reception demodulation unit, an audio presentation device for outputting the output of the audio decoding unit, an operation unit for setting display of audio of the digital broadcast, The control unit controls the operation of the digital reception demodulation unit and the audio decoding unit, and this control unit stops the operation of the audio decoding unit when the operation unit is selected to reproduce only the video. I try to control it.

  If the portable digital broadcast receiving apparatus has such a configuration, it is possible to stop the operation of the audio decoding unit and reproduce only the video, and perform unnecessary processing circuit operations according to the user's viewing mode. It is possible to stop the power consumption, which is one of the major problems in the portable digital broadcast receiver.

  In addition, the fourth portable digital broadcast receiver displays a digital reception demodulator that receives and demodulates a desired broadcast wave, a video decoder that reproduces a video signal from the output of the digital receiver demodulator, and an output of the video decoder A video display device, an audio decoding unit that reproduces an audio signal from the output of the digital reception demodulation unit, an audio presentation device that outputs the output of the audio decoding unit, and whether an earphone is inserted into the portable digital broadcast receiver And an earphone insertion detection unit for detecting the sound, and the operation of the audio decoding unit is controlled by the determination of the earphone insertion detection unit.

  If the portable digital broadcast receiving apparatus has such a configuration, it is possible to stop the audio processing operation and play back only the video simply by removing the earphone, which is one of the major problems in the portable digital broadcast receiving apparatus. It becomes possible to suppress a certain power consumption and to simplify the user's operation.

  The fifth portable digital broadcast receiver displays a digital reception demodulator that receives and demodulates a desired broadcast wave, a video decoder that reproduces a video signal from the output of the digital reception demodulator, and an output of the video decoder A video display device, an audio decoding unit that reproduces an audio signal from the output of the digital reception demodulation unit, an audio presentation device that outputs an output of the audio decoding unit, and a form detection unit that detects the form of the portable digital broadcast receiving device The operation of the video decoding unit and the video display device is controlled by detection in the form detection unit.

  If the portable digital broadcast receiver has such a configuration, in conjunction with changing the form of the portable digital broadcast receiver, the operation of the video decoding unit and the video display device is stopped, and only the audio can be reproduced. Power consumption can be suppressed and user operations can be simplified.

  The sixth portable digital broadcast receiver further controls the operations of the digital reception decoding unit and the audio decoding unit in the fifth portable digital broadcast reception device based on detection by the form detection unit.

  If the portable digital broadcast receiving apparatus has such a configuration, digital reception can be completed in conjunction with changing the form of the portable digital broadcast receiving apparatus, and the user's operation can be simplified.

  The seventh portable digital broadcast receiver has the sub video display device in the fifth or sixth portable digital broadcast receiver, and the control unit outputs the output from the video decode unit by detection in the form detection unit. It is configured to control to display on the sub video display device.

  If the portable digital broadcast receiving apparatus has such a configuration, the video display device can be switched in accordance with the change in the form of the portable digital broadcast receiving apparatus, and the user's operation can be simplified.

  The eighth portable digital broadcast receiving device controls the video decoding unit to perform down-decoding by detecting the form detection unit in the seventh portable digital broadcast receiving device, and the output from the video decoding unit is sub-video. It is configured to output to a display device.

  If the portable digital broadcast receiving apparatus has such a configuration, the down-decoded video is displayed on the sub-video display device in accordance with the change in the form of the portable digital broadcast receiving apparatus. Operation can be simplified.

  The ninth portable digital broadcast receiver displays a digital reception demodulator that receives and demodulates a desired broadcast wave, a video decoder that reproduces a video signal from the output of the digital receiver demodulator, and an output of the video decoder A video display device, an audio decoding unit that reproduces an audio signal from the output of the digital reception demodulation unit, an audio presentation device that outputs the output of the audio decoding unit, a down-decode control unit that controls down-decoding of the video decoding unit, A digital reception demodulation unit, a video decoding unit, a video display device, an audio decoding unit, an audio presentation device, and a remaining battery level detection unit for detecting the remaining battery level for supplying power to the down decode control unit. When the amount detection unit determines that the remaining battery level is below a certain threshold, the down-decode control unit down-decodes to the video decoding unit. It is constituted to control to perform.

  If the portable digital portable broadcast receiving apparatus has such a configuration, when the battery amount of the portable broadcast receiving apparatus decreases, down-decoding can be automatically performed, and power consumption can be suppressed. .

  The tenth portable digital broadcast receiver displays a digital reception demodulation unit that receives and demodulates a desired broadcast wave, a video decoding unit that reproduces a video signal from the output of the digital reception demodulation unit, and an output of the video decoding unit A video display device, an audio decoding unit that reproduces an audio signal from the output of the digital reception demodulator, and an audio presentation device that outputs the output of the audio decoding unit. It has a function, and when an operation related to a communication function or a game function is performed, the operation of the video decoding unit is stopped, and an image related to the communication function or the game function is displayed on the video display device.

  If the portable digital broadcast receiving apparatus has such a configuration, it is possible to operate functions other than broadcasting such as communication and games while enjoying digital broadcasting by sound, and to suppress power consumption at that time.

  Further, the eleventh portable digital broadcast receiving apparatus has a display means for displaying the operating state of the broadcast receiving function, and displays the current operating state of the broadcast receiving function so that the user and a third party can understand. is there.

  If the portable digital broadcast receiving device has such a configuration, the operating status of the broadcast receiving function can be displayed, the user can be prevented from forgetting to turn off the power, and the third party must be clearly viewing the digital broadcast. Can do.

  Further, the twelfth portable digital broadcast receiving apparatus is configured to display the state of the circuit operation of the video decoding unit, the video display device, and the audio decoding unit so that the user and a third party can understand.

  If the portable digital broadcast receiving apparatus has such a configuration, the circuit operation status of the video decoding unit, the video display device, and the audio decoding unit can be displayed, and the user can be prevented from forgetting to turn off the power.

  In addition, a receiving apparatus for solving the above-described conventional problems includes a demodulator that demodulates a received signal to generate video data, and a first video signal having a predetermined number of frames per second from the video data, or A video signal generation unit that generates a second video signal having a smaller number of frames per second than the video signal of 1, a video display device that displays the first video signal or the second video signal, and video signal generation The unit is configured with a control unit that controls which of the first video signal and the second video signal is generated. Furthermore, if a detection unit for detecting the remaining battery level of the receiving device is provided, a process for generating a second video signal for the video signal generation unit when the remaining battery level is lower than a predetermined threshold value. It is also possible for the control unit to perform control.

  The portable digital broadcast receiving apparatus of the present invention can suppress wasteful power consumption when selecting a mode for outputting only video or a mode for outputting only audio. In addition, it is possible to simplify the user operation at the time of mode switching.

1 is a block diagram of a mobile digital broadcast receiver according to Embodiment 1 of the present invention. Block diagram of portable digital broadcast receiving apparatus in embodiment 2 of the present invention Block diagram of portable digital broadcast receiving apparatus according to Embodiment 3 of the present invention Block diagram of portable digital broadcast receiving apparatus in embodiment 4 of the present invention Block diagram of portable digital broadcast receiving apparatus in Embodiment 5 of the present invention Block diagram of a portable digital broadcast receiver in Embodiment 6 of the present invention Block diagram of a portable digital broadcast receiving apparatus according to Embodiment 7 of the present invention Block diagram of portable digital broadcast receiving apparatus in embodiment 8 of the present invention Block diagram of a television broadcast receiver having a conventional audio mode

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram of a portable digital broadcast receiving apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the portable digital broadcast receiving apparatus includes an antenna 1, a tuner 2, a digital demodulation / decoding unit 3, a video decoding circuit 4, a video output circuit 5, a display device 6, an audio decoding circuit 7, and an audio output. A circuit 8, a speaker or earphone 9, an operation unit 10, and a control unit 11 are included.

  The broadcast wave is sent to the tuner 2 via the antenna 1, and the receiving channel is selected by the tuner 2, and digital demodulation / error such as OFDM (Orthogonal Frequency Division Multiplex) is performed in the digital demodulation / decoding unit 3. TS (Transport Stream: transmission stream) is reproduced with correction, and divided into an audio signal and a video signal. The tuner 2 and the digital demodulation / decoding unit 3 are collectively referred to as a digital reception / demodulation unit 51. A video signal such as MPEG (Moving Picture Experts Group) 2/4 is decoded by the video decoding circuit 4 and displayed on the display device 6 via the video output circuit 5. On the other hand, the audio signal is decoded by the audio decoding circuit 7 and output by the speaker or the earphone 9 via the audio output circuit 8. The video decoding circuit 4 and the video output circuit 5 are collectively referred to as a video decoding unit 52, and the audio decoding circuit 7 and the audio output circuit 8 are collectively referred to as an audio decoding unit 53.

  The operation of selecting and canceling the video mode for outputting only digital broadcast video and the audio mode for outputting only audio will be described.

  The operation unit 10 includes a selection unit that can select from an audio mode, a video mode, and a normal mode that normally outputs video and audio. When the user selects the voice mode with the operation unit 10, a voice mode selection signal is sent to the control unit 11. When receiving the audio mode selection signal, the control unit 11 sends a control signal for stopping the circuit operation to the video decoding unit 52 and the display device 6. When this control signal is received, the circuit operations of the video decoding unit 52 and the display device 6 are stopped, and the video is not displayed. When the audio mode is canceled, a control signal for starting the circuit operation is sent to the video decoding unit 52 and the display device 6, and the circuit operations of the video decoding unit 52 and the display device 6 are restarted, and the video is displayed on the display device 6. Is displayed.

  When the user selects a video mode with the operation unit 10, a video mode selection signal is sent to the control unit 11. When receiving the video mode selection signal, the control unit 11 sends a control signal for stopping the circuit operation to the audio decoding unit 53. When this control signal is received, the circuit operation of the audio decoding unit 53 stops, and no audio is output from the speaker or the earphone 9. When the video mode is canceled, a control signal for starting the circuit operation is sent to the audio decoding unit 53, the circuit operation of the audio decoding unit 53 is restarted, and audio is output from the speaker or the earphone 9.

  Note that the circuit operation can be stopped and released by stopping and restarting the supply of power to the circuit, or by stopping and restarting the clock supplied to the circuit.

  Therefore, when the audio mode and the video mode are selected, it becomes possible to stop the circuit operation unnecessary for the viewing mode, and the power consumption can be reduced.

(Embodiment 2)
Next, Embodiment 2 of the portable digital broadcast receiving apparatus of the present invention will be described with reference to FIG.

  FIG. 2 is a block diagram of a portable digital broadcast receiver according to Embodiment 2 of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  The present embodiment is different from the first embodiment in that it has a standby image and displays a standby video on the display device 6 when the audio mode is selected.

  When the user selects the voice mode with the operation unit 10, a voice mode selection signal is sent to the control unit 11. When the control unit 11 receives the audio mode selection signal, the control unit 11 sends a control signal for stopping the circuit operation of the video decoding unit 52 to stop the circuit operation of the video decoding unit 52. Further, the control unit 11 switches the switch 41 so that a standby image is displayed on the display device 6. As a result, the standby image is displayed on the display device.

  Note that the backlight of the display device 6 may be turned off when the standby image is displayed. Therefore, when the audio mode and the video mode are selected, it becomes possible to stop the circuit operation unnecessary for the viewing mode, and the power consumption can be reduced.

(Embodiment 3)
Next, a third embodiment of the portable digital broadcast receiving apparatus of the present invention will be described with reference to FIG.

  As shown in FIG. 3, the mobile digital broadcast receiving apparatus includes an antenna 1, a tuner 2, a digital demodulation / decoding unit 3, a video decoding circuit 4, a video output circuit 5, a display device 6, an audio decoding circuit 7, and an audio output. The circuit 8 includes a speaker or earphone 9, an operation unit 10, a control unit 11, and an earphone insertion detection unit 12.

  The earphone insertion detection unit 12 detects whether or not the earphone 9 is inserted into the portable digital broadcast receiver. If the earphone insertion detection unit 12 determines that the earphone 9 is not inserted, it sends a video mode selection signal to the control unit 11, and the control unit 11 sends a circuit operation OFF signal to stop the operation of the audio decoding unit 53. The operation of the circuit of the audio decoding unit 53 is stopped. If the earphone insertion detection unit 12 determines that the earphone 9 is inserted, it sends a normal mode selection signal to the control unit 11. The control unit 11 sends a circuit operation ON signal so as to restart the operation of the audio decoding unit 53, restarts the circuit operation of the audio decoding unit 53, and outputs audio from the earphone 9. As a result, when the user is viewing and enjoys only the video, the user can simply remove the earphone 9 from the portable digital broadcast receiver and stop the audio processing operation without having to switch to the video mode. On the contrary, simply by inserting the earphone, the voice processing operation is resumed and the mode is switched to the normal mode, so that the user's operation can be simplified.

  Note that the operation unit 10 may be provided with a means capable of selecting to ignore the signal from the earphone insertion detection unit 12.

(Embodiment 4)
Next, Embodiment 4 of the portable digital television broadcast receiver of the present invention will be described with reference to FIG.

  FIG. 4 is a block diagram of a portable digital broadcast receiver according to Embodiment 4 of the present invention. The same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

  The present embodiment is different from the third embodiment in that it has a form detection unit 13 for detecting the form of the portable digital broadcast receiving device instead of the earphone insertion detection unit.

  The form detection unit 13 detects, for example, that the portable digital broadcast receiving device is folded, bent into an L shape, partially rotated, and the expansion and contraction of the antenna 1.

  Hereinafter, the folding portable digital broadcast receiving apparatus will be referred to. When the form detection unit 13 determines that the receiving apparatus is folded, the form detection unit 13 sends a form B detection signal to the control unit 11, and the control unit 11 includes the digital reception decoding unit 51 and the video decoding unit 52. A circuit operation OFF signal is sent to the display device 6 and the audio decoding unit 53. With this signal, the operations of the digital reception demodulation unit 51, the video decoding unit 52, the display device 6, and the audio decoding unit 53 are stopped.

  This allows the user to fold the receiver without stopping the digital broadcast reception function, thereby stopping the broadcast reception function, thereby simplifying the user's operation.

  Further, the operation unit 10 has means for selecting a quasi-sound mode that becomes a sound mode when the portable digital broadcast receiving device is folded. When the quasi-sound mode is selected in the operation unit 10, it is folded by the form detection unit 13. When the determination is made, the form detection unit 13 sends a form B detection signal to the control unit 11, and the control unit 11 sends a circuit operation OFF signal to the video decoding unit 52 and the display device 6. Due to this signal, the operations of the video decoding unit 52 and the display device 6 are stopped. When the form detection unit 13 determines that the receiving device is opened, the form detection unit 13 sends a form A detection signal to the control unit 11, and the control unit 11 turns on the circuit operation to the video decoding unit 52 and the display device 6. Send a signal. With this signal, the operations of the video decoding unit 52 and the display device 6 are resumed.

  As a result, the user stops the video display by folding the portable digital broadcast receiving device, and conversely, the video processing operation is resumed by opening the receiving device. Operation can be simplified.

(Embodiment 5)
Next, Embodiment 5 of the portable digital broadcast receiving apparatus of the present invention will be described with reference to FIG.

  FIG. 5 is a block diagram of a portable digital broadcast receiver according to Embodiment 5 of the present invention. The same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.

  Compared with the fourth embodiment, this embodiment switches the display of the output from the video decoding unit 52 from the main display device 6 to the sub display device 15 in the folded state. The difference is that down-decoding is performed.

  The portable digital broadcast receiving apparatus according to the fifth embodiment of the present invention has a down-decode control for controlling the down-decode ON / OFF in the video decoding circuit 4 based on signals from the sub display device 15, the changeover switch 42, and the form detector 13. When the form detection unit 13 determines that the state is folded, the switch 42 is switched to the display device 15, and a form B detection signal is sent to the down decode control unit 14. It is done. When the downdecode control unit 14 receives this signal, the downdecode control unit 14 sends a downdecode control ON signal to the video decode circuit 4. With this signal, the video decoding circuit 4 performs down-decoding different from the normal one, and the down-decoded video is displayed on the display device 15 via the video output circuit 5. If it is determined that the switch is in the open state, the switch 42 is switched to the display device 6, and a form A detection signal is sent to the down decode control unit 14. When the downdecode control unit 14 receives this signal, the downdecode control unit 14 sends a downdecode control OFF signal to the video decoding circuit 4. With this signal, the video decoding circuit 4 performs normal decoding, and the normal video is displayed on the display device 6 via the video output circuit 5.

  Thus, the user can display the video that has been down-decoded by the video decoding circuit 4 on the sub-display device 15 by folding the portable digital broadcast receiving apparatus, thereby reducing power consumption.

  In the present embodiment, the down-decoding in the video decoding circuit 4 has been described. However, the video output circuit 5 may be controlled to reduce the number of frames output per second. Further, down decoding and reduction of the number of frames may be set by the user through the operation unit 10.

(Embodiment 6)
Next, Embodiment 6 of the portable digital broadcast receiver of the present invention will be described with reference to FIG.

  FIG. 6 is a block diagram of a portable digital broadcast receiver according to Embodiment 6 of the present invention.

  As shown in FIG. 6, the portable digital broadcast receiver includes an antenna 1, a tuner 2, a digital demodulation / decoding unit 3, a video decoding circuit 4, a video output circuit 5, a display device 6, an audio decoding circuit 7, and an audio output. A circuit 8, a speaker or earphone 9, an operation unit 10, a control unit 11, a down decode control unit 14, and a battery remaining amount detection unit 16 are included.

  When the remaining battery level detection unit 16 detects that the remaining battery level is smaller than the threshold value, the down decode control unit 14 sends a down decode control ON signal to the video decoding circuit 4. In response to this signal, the video decoding circuit 4 performs down-decoding different from the normal one, and the down-decoded video is displayed on the display device 6 via the video output circuit 5.

  As a result, when the remaining battery level is low, the video that has been down-decoded by the video decoding circuit 4 can be displayed on the display device 6, and the power consumption can be reduced.

  In the present embodiment, the down-decoding in the video decoding circuit 4 has been described. However, the video output circuit 5 may be controlled to reduce the number of frames output per second. Further, down decoding and reduction of the number of frames may be set by the user through the operation unit 10.

(Embodiment 7)
Next, a seventh embodiment of the portable digital broadcast receiving apparatus of the present invention will be described with reference to FIG.

  FIG. 7 is a block diagram of a portable digital broadcast receiver according to Embodiment 7 of the present invention. The same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

  Compared with the second embodiment, the present embodiment replaces the standby screen on the display device 6 with the communication / game function operation unit 17 such as the communication function and the game function, the communication / game function processing circuit 18 and the functions thereof. It has an image output circuit 19 that outputs an image, and controls to display on the display device 6 an image of a function other than a digital broadcast receiving function such as a communication function such as a mail or a game, or a game while receiving a digital broadcast. Is different.

  The portable digital broadcast receiving apparatus in FIG. 7 controls the control unit 11 to control the operation of the video decoding unit 52 when a mail / Internet or game operation is performed during reception of the digital broadcast by the communication / game function operation unit 17. A signal is sent. With this signal, the control unit 11 sends a circuit operation OFF signal to the video decoding unit 52 and stops the circuit operation of the video decoding unit 52. When communication or game function operation is performed, the switch 43 is switched by a switch control signal, and a signal sent from the communication / game function processing circuit 18 is displayed on the display device 6 via the image output circuit 19. Is done. When the end key of this function is operated on the communication / game function operation unit 17, a normal mode selection signal is sent to the control unit 11, and the operation of the video decoding unit 52 is resumed. Further, the switch 43 is switched, and the digital broadcast video sent from the video output circuit 5 is displayed on the display device 6.

  As a result, while enjoying the sound of digital broadcasting from the speaker and the earphone 9, it is possible to use communication functions such as mail and the Internet, and functions other than broadcast reception such as games, and the convenience of the user is improved. At this time, power consumption can be reduced by stopping the circuit operation of the video decoding unit 52.

(Embodiment 8)
Next, an eighth embodiment of the portable digital broadcast receiving apparatus of the present invention will be described with reference to FIG.

  FIG. 8 is a block diagram of a portable digital broadcast receiver according to Embodiment 8 of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  The present embodiment is different from the first embodiment in that a display signal control unit 20, a digital broadcast function operation state display unit 21, and a mode state display unit 22 are provided.

  When the user switches the power of the portable digital broadcast receiver ON / OFF by the operation unit 10, a digital broadcast function operation ON / OFF selection signal is sent to the display signal control unit 20, and the display signal control unit 20 transmits the digital broadcast. The function operation state display unit 21 displays that the power is ON or OFF. Further, when the user selects a mode such as a sound mode for reproducing only sound by the operation unit 10, a mode selection signal is sent to the display signal control unit 20, and the display signal control unit 19 is selected by the mode state display unit 22. Display the mode.

  As a result, the operation status and mode selection status of the broadcast receiving function can be displayed, and the user can be prevented from forgetting to turn off the power. In recent years, the morals of using communication devices in public places have been pointed out. By displaying the operation status of the digital broadcast function, the portable digital broadcast receiver of FIG. Even if it has a communication function such as the above, it can be clearly shown to a third party that the user is viewing the digital broadcast instead of the communication function.

  Note that an operation state display unit for the communication function may be provided to display that the operation of the communication function is stopped.

  The portable digital receiver according to the present invention has a function of stopping circuit operations of the decoding unit and the video display device when an audio mode for reproducing only audio and a video mode for reproducing only video are selected, thereby reducing power consumption. It is useful as a thing. Further, the present invention can be used not only for portable digital broadcast receivers but also for stationary digital broadcast receivers, in-vehicle digital broadcast receivers, and the like, and has wide industrial applicability.

DESCRIPTION OF SYMBOLS 1 Antenna 2 Tuner 3 Digital demodulation decoding part 4 Image | video decoding circuit 5 Image | video output circuit 6 Display device 7 Audio | voice decoding circuit 8 Audio | voice output circuit 9 Speaker / Earphone 10 Operation part 11 Control part 12 Earphone insertion detection part 13 Form detection part 14 Down Decoding control unit 15 Display device 16 Battery remaining amount detection unit 17 Communication / game function operation unit 18 Communication / game function processing circuit 19 Image output circuit 20 Display signal control unit 21 Digital broadcast function operation state display unit 22 Mode state display unit 41 Switch 42 switch 43 switch 51 digital reception demodulation unit 52 video decoding unit 53 audio decoding unit 101 remote control device 102 remote control light receiving unit 103 CPU
104 power supply circuit 105 deflection voltage control circuit 106 video signal audio signal input terminal 107 input signal selection circuit 108 sync separation circuit 109 deflection high voltage circuit 110 video signal processing circuit 111 deflection coil 112 anode terminal 113 CRT
114 Audio amplification circuit 115 Speaker

Claims (4)

A demodulator that demodulates the received signal to generate video data;
A video signal generation unit that generates a first video signal having a predetermined number of frames per second from the video data, or a second video signal having a smaller number of frames per second than the first video signal;
A video display device for displaying the first video signal or the second video signal;
A receiving device comprising: a control unit that controls which of the first video signal and the second video signal is generated by the video signal generation unit. The receiving device further includes a detection unit that detects a remaining amount of a battery included in the receiving device,
The control unit according to claim 1, wherein the control unit controls the video signal generation unit to perform a process of generating the second video signal when the remaining amount of the battery is less than a predetermined threshold. Receiver device. A receiving method performed by a receiving device,
Demodulating a received signal to generate video data;
Generating a first video signal having a predetermined number of frames per second from the video data or a second video signal having a smaller number of frames per second than the first video signal;
Displaying the first video signal or the second video signal on a video display device included in the receiving device;
Controlling whether to generate the first video signal or the second video signal. The reception method further includes a step of detecting a remaining amount of a battery included in the reception device,
Controlling to generate the second video signal in the step of controlling whether to generate the first video signal or the second video signal when the remaining amount of the battery is less than a predetermined threshold The receiving method according to claim 3.

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