JP5246761B2 - Video playback apparatus and program - Google Patents

Description

  The present invention relates to a video playback device that processes video and a program that causes a computer to function as the video playback device.

  A receiving device that receives terrestrial digital broadcasting includes a tuner that demodulates a transport stream (TS) from received radio waves, separates packets from the transport stream, and outputs video and audio by decoding the packets with a decoder. In digital terrestrial broadcasting, the frequency band assigned to one broadcasting station is divided into 13 segments, and one segment (31 in FIG. 3) is used to transmit one-segment broadcasting, and 13 segments (FIG. 3) are transmitted. 32) is used to transmit full-segment broadcasting.

  One-segment broadcasting is a standardized broadcast for mobile terminals, so powerful error correction is possible so that TV content data can be decoded if the C / N ratio (Carrier to Noise ratio) of the received radio wave is about 7 dB or more. The mechanism is incorporated. On the other hand, it is recommended that the necessary C / N ratio is about 20 dB or more in full-segment broadcasting standardized for reception on a fixed television.

  For this reason, when receiving full-segment broadcasting with an antenna having low reception sensitivity, a necessary C / N ratio may not be ensured in areas other than areas where electric field strength is strong.

  FIG. 4 is a diagram showing areas where full-segment broadcasting and one-segment broadcasting can be received. Radio waves are transmitted from the base station 400, area A2 is an area where full-segment broadcasting and one-segment broadcasting can be received, and area A1 indicates an area where only one-segment broadcasting can be received.

  Here, when a user who is watching one-segment broadcasting in area A1 moves to area A2, it is convenient to automatically switch to full-segment broadcasting, and such a technique is known. The reverse switching is also the same.

  In Patent Document 1, if the reception state deteriorates during reception of full-segment broadcasting, switching to one-segment broadcasting is continued and reception is continued. If the radio wave state of full-segment broadcasting is recovered during reception of one-segment broadcasting, digital broadcasting is switched to full-segment broadcasting. A receiving device is disclosed.

JP 2005-277873 A

  However, in order to realize switching from one-segment broadcasting to full-segment broadcasting, it is necessary to detect that the terminal has moved into an area where the television data of full-segment broadcasting can be received. For this purpose, it is necessary to always activate the full segment tuner and monitor the reception status of the television data, which causes a problem that power consumption increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a video playback terminal that suitably receives television data while suppressing power consumption of the receiving terminal.

In order to achieve the above object, the video reproduction apparatus of the present invention provides:
A first tuner for receiving first television data;
A second tuner for receiving second television data having a larger amount of data than the first television data;
Reproduction means for reproducing the first television data received by the first tuner or the second television data received by the second tuner;
Whether or not the reception status of the second television data of the second tuner is better than a predetermined standard when the reproduction means is reproducing the first television data. A reception status determination means for repeatedly determining in,
When the reception status determining unit determines that the reception status is better than a predetermined reference, the playback unit plays back the second television data instead of the first television data. Control means to control,
History storage means for storing a history of reception status of the second television data received by the second tuner,
The reception status determination unit varies a cycle for determining whether or not the reception status is good according to the history of the reception status stored in the history storage unit.
And wherein a call.
Furthermore, a program for causing a computer to execute the main functions of the present invention is provided.

  According to the present invention, it is possible to suitably receive and reproduce television data while suppressing power consumption of the receiving terminal.

(Embodiment 1)
Hereinafter, a video reproducing apparatus according to an embodiment of the present invention will be described. The present embodiment is an example in which the video reproduction device is applied to a mobile phone 1 having a content receiving function. The mobile phone 1 can receive content in accordance with an arbitrary data transfer method, but the case of receiving content in one-segment broadcasting and full-segment broadcasting will be described below.

  The cellular phone 1 is a cellular phone 1 having a content reproduction function, which is of a folding type as shown in FIG. 2, for example, and includes a keyboard 2, a display panel 5, and the like.

  The keyboard 2 includes a cursor key 3, a switching button 4, and various other buttons. The keyboard 2 is used by a user to input various data and instructions. For example, it is used for inputting an instruction such as channel selection.

  The display panel 5 is composed of a dot matrix type LCD (liquid crystal display) panel or the like, and displays arbitrary data (for example, video, caption, data broadcast, etc.). The call microphone 6 inputs a call voice. The call speaker 7 outputs a received voice. The speaker 8 outputs sound at the time of content reproduction.

  Next, the circuit configuration of the mobile phone 1 will be described. As shown in FIG. 1, the mobile phone 1 includes a control unit 11, a storage unit 12, an operation unit 13, a display unit 14, a one-segment tuner 15, a one-segment decoding unit 16, an audio output unit 17, an audio input unit 18, and a communication unit 19. , A bus 20, a full segment tuner 21, a descrambling unit 22, a full segment decoding unit 23, and a timer 24.

  The control unit 11 includes a microprocessor unit and the like, and controls the overall operation of the mobile phone 1. For example, playback of received television broadcast content and channel change are controlled. Further, the control unit 11 displays various data (video, caption text, data broadcast, etc.) on the display panel 5 via the display unit 14.

  The storage unit 12 stores various data. For example, the storage unit 12 stores an operation control program for the control unit 11. The storage unit 12 may be configured by either a memory built in the mobile phone 1 or a removable external memory. The operation unit 13 includes the keyboard 2, the cursor key 3, the switching button 4, and the like, and inputs an operation signal corresponding to an operation from the user to the control unit 11.

  The display unit 14 includes the display panel 5 and a driver circuit, and displays an image on the display panel 5 under the control of the control unit 11. The one seg tuner 15 demodulates the content of the one seg broadcast received via the antenna and outputs a demodulated signal to the one seg decoding unit 16. The one seg decoding unit 16 decodes and outputs the content output by the one seg tuner 15.

  A detailed configuration of the one-segment tuner 15 is shown in FIG. The one-segment tuner 15 includes an antenna 150, a field strength measuring device 151, a receiver 152, a demodulator 153, a BER (Bit Error Rate) measuring device 154, a field strength output line 155, a BER output line 156, and a TS (Transport Stream) output line. 157 and the like.

  The antenna 150 has a shape necessary for receiving a digital broadcast, for example, a radio wave in the UHF band or a radio wave in the VHF band. The electric field strength measuring device 151 obtains the electric field strength value in the state of receiving the digital broadcast and outputs it to the control unit 11 via the electric field strength output line 155.

  Receiver 152 outputs the signal input from antenna 150 to demodulator 153 at the subsequent stage as an RF (Radio Frequency) signal. The demodulator 153 demodulates the RF signal input from the receiver 152 and outputs TS data. Further, after the BER value is measured by the subsequent BER measuring device 154, the TS is output from the TS output line 157. Further, the measured BER value is output to the control unit 11 via the BER output line 156.

  The full segment tuner 21 shown in FIG. 1 demodulates the content of the full segment broadcast received via the antenna, and outputs the demodulated signal to the descramble unit 22. Note that the detailed configuration of the full-segment tuner 21 is the same as that of the one-segment tuner 15.

  The descrambling unit 22 decrypts the scrambled content output from the full segment tuner 21 and outputs the data to the full segment decoding unit 23 in plain text. The full segment decoding unit 23 decodes and outputs the plaintext content output from the descrambling unit 22.

  The audio output unit 17 includes the above-described call speaker 7 and speaker 8, DAC (Digital Analog Converter), and the like. For example, the audio output unit 17 performs DA conversion on the audio signal of the content reproduced by the control unit 11 and emits sound through the speaker 8. . The voice input unit 18 collects voice signals and supplies them to the communication unit 19 during a call or the like. The communication unit 19 transmits / receives call voice, various data, and the like via the base station. The bus 20 transmits data between the units.

  The timer 24 is a mechanism attached to the microprocessor unit and the like, and generates interrupts at regular time intervals. The timer 24 can set a time interval at which the control unit 11 generates an interrupt.

(Overview of switching process)
If the electric field intensity or the like deteriorates while receiving and viewing a full-segment broadcast, block noise may occur in the video, and it may not be possible to continue watching. In such a case, by switching to the one-seg broadcasting of the same channel and displaying it, the user can view the program without interruption and the usability is improved. In order to control in this way, for example, the electric field strength is acquired during reception of the full-segment broadcasting, and it is determined whether or not it is larger than a predetermined threshold. If it becomes smaller than the threshold value, it is switched to one-segment broadcasting and displayed. Further, the BER value is acquired and it is determined whether or not it is smaller than a predetermined threshold value. And if it becomes larger than the threshold, it is switched to one-segment broadcasting and displayed.

  The contents of this processing will be described with reference to FIG. FIG. 6 shows a diagram in which the time change of the BER value acquired by the BER measuring instrument of the full segment tuner 21 is plotted. Here, the threshold 140 indicates a value for switching from full segment reception to one segment reception when the BER value is larger than this. When the acquired BER value exceeds the threshold value 140 at time t1, a process for switching to one-segment broadcasting is performed.

  Specifically, first, the full-segment tuner 21 is turned off. Then, the one-seg tuner 15 is turned on and activated, and the TS output from the one-seg tuner 15 is input to the one-seg decoding unit 16. The input TS is decoded by the one-segment decoding unit 16, converted into YUV data, and displayed via the display unit 14.

  Further, when the value falls below the threshold 140 at time t2, a switching process to full segment broadcasting is performed. Specifically, the same processing as the switching processing to one-segment broadcasting is performed. First, the one-segment tuner 15 is turned off. Then, the full segment tuner 21 is turned on and activated, and the TS output from the full segment tuner 21 is descrambled and decoded, and displayed on the display unit 14. As described above, the switching process between the one-segment broadcasting and the full-segment broadcasting can be performed using the BER value of the full-segment broadcasting.

  Here, when the switching determination process is performed using the BER value or electric field strength of full-segment broadcasting, if the full-segment tuner 21 is always turned on, large power consumption is used. In general, the full segment tuner 21 uses larger power consumption than the one segment tuner 15. As shown in FIG. 3, this is because full-segment broadcasting uses a frequency band about 13 times that of one-segment broadcasting, and the TS bit rate is high and the amount of data to be processed is large. .

  For this reason, in the present invention, the power of the full segment tuner 21 is not always turned on, but the power consumption is suppressed by turning on the full segment tuner 21 as necessary. The timing for turning on the full segment tuner 21 will be described later.

(Full segment video output processing)
A full segment video output process for outputting a full segment broadcast video will be described with reference to FIG. First, the full segment tuner 21 receives radio waves of full segment broadcasting. Then, under the control of the control unit 11, the full segment tuner 21 performs demodulation processing and outputs a full segment transport stream (hereinafter, TS). (Step S101). Next, since the TS is scrambled for content protection, the descrambling unit 22 performs descrambling and outputs a plaintext TS (step S102). Then, the plaintext TS is decoded by the full segment decoding unit 23 (step S103). In the decoding process, the TS is first separated into data such as video data, audio data, caption data, data broadcast, and PSI / SI information, and then each elementary stream (ES) is decoded. As a result, the video ES is converted into YUV data. Finally, the video data is displayed on the display unit 14 (step S104). The audio ES is converted into PCM (Pulse Code Modulation) data and output from the speaker 8.

  Next, in the receiving terminal of the present embodiment, the flow of the switching determination process for intermittently acquiring the full-seg broadcast electric field strength while receiving the one-segment broadcast and switching to the full-seg broadcast when the electric field strength is equal to or greater than a certain threshold will be described. (FIG. 8).

  First, when the reception of the one-segment broadcasting is started, the control unit 11 starts the timer 24 (step S201). When it is detected that the timer 24 has expired after a certain time has elapsed (step S202; Yes), the full segment tuner 21 is turned on and activated (step S203). Then, the electric field intensity E2 of the full segment broadcast wave is acquired (step S204), and it is determined whether or not the acquired electric field intensity E2 is larger than a predetermined threshold Et2 (step S205). The threshold Et2 is a program variable stored in the storage unit 12 and can be acquired by accessing the storage unit 12. It may be set in a register on the terminal hardware.

  Here, when the electric field intensity E2 is smaller than the threshold Et2 (step S205; No), the power supply of the full segment tuner 21 is turned off (step S206), the process returns to step S201 again and the timer 24 is started. When the electric field intensity E2 is larger than the threshold Et2 (step S205; Yes), the full segment video output process is started (FIG. 7). Note that when the full segment video output process is started, the power of the one segment tuner 15 may be turned off.

  Thus, by intermittently acquiring the electric field strength of full segment broadcasting, it is possible to keep the power consumption of the terminal low. As a result, the viewing time of the television is extended and user convenience is improved.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described. If one-segment broadcasting and full-segment broadcasting are on the same channel, radio waves are transmitted using the same frequency band as shown in FIG. Therefore, there is a correlation that if the electric field strength of one-segment broadcasting is strong, the electric field strength of full-segment broadcasting received at the same place is also strong. The BER value described above has a similar correlation. In the second embodiment, using this correlation, the timing for acquiring the electric field strength of full-segment broadcasting is determined using the electric field strength of one-segment broadcasting as a guide.

  The switching determination processing flow of the second embodiment for acquiring the electric field strength of the one-segment broadcasting during reception of the one-segment broadcasting and acquiring the electric field strength of the full-segment broadcasting only when the value is larger than a certain threshold will be described (FIG. 9). .

  First, during reception of one-segment broadcasting, the control unit 11 acquires the electric field strength E1 of one-segment broadcasting (step S301). Then, it is determined whether or not the acquired electric field strength E1 is larger than a predetermined threshold Et1 (step S302). The threshold Et1 is a program variable stored in the storage unit 12 like the threshold Et2, and is a value that can be acquired by accessing the storage unit 12. It may be set in a register on the terminal hardware.

  If the electric field strength E1 is smaller than the threshold Et1 (step S302; No), the one-segment electric field strength E1 is acquired again (return to step S301). On the other hand, when the electric field strength E1 is larger than the threshold Et1 (step S302; Yes), the full segment tuner 21 is turned on and activated (step S303). Then, the electric field intensity E2 of the full-segment broadcasting wave is acquired (step S304), and it is determined whether the acquired electric field intensity E2 is larger than a predetermined threshold Et2 (step S305).

  If the electric field strength E2 is smaller than the threshold Et2 (step S305; No), the full-segment tuner 21 is turned off (step S306), and the process returns to step S301 again to acquire the one-segment electric field strength E1. When the electric field intensity E2 is larger than the threshold Et2 (step S305; Yes), the full segment video output process is started (FIG. 7).

  In this way, by determining whether or not to obtain the electric field strength E2 of the full-segment broadcasting based on the electric field strength E1 of the one-segment broadcasting, it is not necessary to periodically receive in areas where the electric field strength E2 of the full-segment broadcasting is obviously weak. , Power consumption can be reduced.

(Embodiment 3)
However, in the second embodiment, if the threshold value Et1 is set too small, the electric field strength E1 is always larger than the threshold value Et1 (step S302; Yes), and the electric field of the full segment tuner 21 is always turned on. Processing to acquire the strength is performed. Thus, depending on the setting of the threshold value, the effect of reducing power consumption may be reduced.

  Therefore, in the third embodiment, when the electric field strength E1 of the one-segment broadcasting is strong, the timing for acquiring the electric field strength E2 of the full-segment broadcasting is intermittently performed using the timer 24. Thereby, power consumption can be further reduced. A switching determination process flow of the third embodiment will be described (FIG. 10).

  When the reception of the one-segment broadcasting is started, first, the control unit 11 starts the timer 24 (step S401). Then, when the timer 24 expires after a certain period of time (step S402; Yes), the same processing as step S301 to step S305 in FIG. 9 is performed to obtain the electric field intensity E2 of full segment broadcasting. When the electric field intensity E2 is larger than the threshold Et2 (step S305; Yes), the full segment video output process is started (FIG. 7). If the electric field intensity E2 is smaller than the threshold Et2 (step S305; No), the full segment tuner 21 is turned off (step S306), the process returns to step S401 again, and the timer 24 is started.

  As described above, in the third embodiment, the power consumption can be suppressed by acquiring the electric field strength E2 of the full-segment broadcasting only when the electric field strength E1 of the one-segment broadcasting is strong, and the processing is intermittently performed by the timer 24. By doing so, power consumption can be kept lower.

(Use of BER value and other indicators)
In the above embodiment, the electric field strength is used as the switching timing between the one-segment broadcasting and the full-segment broadcasting. However, the present invention is not limited to this as long as it indicates that the reception state of the full-segment broadcasting has deteriorated. For example, a change in C / N ratio indicating the signal quality of radio waves, a change in AGC (Automatic Gain Control) value indicating the radio signal amplification factor that changes depending on the electric field strength, and a BER (Bit) indicating the reception status of demodulated data It may be a change in the Error Rate value or the amount or ratio of the block noise of the resulting video.

(BER, usage flow of other indicators)
Next, a processing flow for the switching determination process using the BER value and the electric field strength will be described (FIG. 11).

  First, the control unit 11 performs the same processing as steps S401 to S402 in FIG. Next, the electric field strength of one seg is acquired (step S501), and it is determined whether or not the value is larger than the threshold (step S502).

  Here, when larger than a threshold value (step S502; Yes), the BER value of 1seg is acquired (step S503), and it is determined whether the value is a value smaller than a threshold value (step S504).

  Here, when it is smaller than the threshold (step S504; Yes), the full segment tuner is turned on and started (step S505). Then, the full-segment electric field strength is acquired (step S506), and it is determined whether or not the value is larger than the threshold value (step S507).

  Here, when it is larger than the threshold (step S507; Yes), the BER value of the full segment is acquired (step S508), and it is determined whether or not the value is smaller than the threshold (step S509).

  Here, when it is smaller than the threshold value (step S509; Yes), the full segment video output process is started (FIG. 7).

  Moreover, when it becomes No in each determination step, it returns to step S401 and starts the timer 24 again. In particular, when the determination result in step S507 or step S509 is No, the full segment tuner is turned off (step S510), and the process returns to step S401.

  Thus, by measuring the reception state using various values, the timing for switching to full-segment broadcasting can be determined more finely, and power consumption can be further reduced.

(Embodiment 4)
Next, an example in which the timer interval is further devised will be described. When the timer interval is long, power consumption can be reduced, but even when entering the area where full segment broadcasting can be received, there will be time before switching to full segment broadcasting, so when full segment broadcasting is displayed Will be late. On the other hand, if the timer interval is short, switching to full segment broadcasting is performed immediately when entering the area where full segment broadcasting can be received, and full segment broadcasting can be displayed immediately, but this has the effect of reducing power consumption. It will decrease.

  Therefore, in the fourth embodiment, the time interval of the timer is changed using the history of the BER value of full segment broadcasting. For example, the time interval of the timer is shortened when moving toward an area where full-segment broadcasting can be received and as a result the BER value continuously decreases. FIG. 12 shows a plot of the BER value of full segment. From time t10 to time t11, the BER value continuously decreases. Therefore, the time interval of the timer is halved, and the BER value is acquired next at time t12. In addition, the BER value continuously increases from time t13 to time t14. Therefore, the timer time interval is doubled, and the BER value is acquired next at time t15. Note that at a time smaller than the threshold value 140, since the full segment is being viewed because the full segment is being viewed, the full segment BER value is always obtained at regular time intervals.

  Next, the processing flow in this case will be described. The operation of the fourth embodiment can be realized by adding the process shown in FIG. 13 between step S508 and step S509 in FIG. First, the control unit 11 performs the same processing as that up to step S508, and acquires the full segment BER value (step S508). Then, the control unit 11 stores the BER value in the storage unit 12 (step S602). Next, the BER value previously stored in the storage unit 12 is acquired (step S603). Since there is no previous BER value for the first time, the process ends here and the process proceeds to step S509.

  Then, it is determined whether or not the current BER value acquired in step S508 is larger than the previous BER value acquired in step S603 (step S604). When it determines with it being small (step S604; No), it progresses to step S608. If it is determined that the value is larger (step S604; Yes), the counter is incremented (step S605). This counter indicates the number of times determined to be continuously large, and is specifically a variable that exists in the program.

  Next, it is determined whether or not the value of the counter is greater than a certain threshold (step S606). If it is less than the threshold value (step S606; No), the process proceeds to step S608. If it is equal to or greater than the threshold (step S606; Yes), the time interval of the timer 24 is shortened (step S607). The amount of reduction may be less than 1 time, for example, 0.5 times. This magnification can be stored on the program. Note that the magnification for shortening the time interval of the timer 24 may be determined based on the difference between the previous BER value and the current BER value or the ratio of the magnitudes. Finally, the counter is reset to 0 (step S608), and the process proceeds to step S509.

  Conversely, when moving away from an area where full-segment broadcasting can be received and the BER value continuously increases as a result, the time interval of the timer 24 is lengthened. That is, when it is determined No in step S604, the counter is incremented, the counter is compared with the threshold value, and if it is equal to or greater than the threshold value, the time interval of the timer 24 may be increased. In this case, the time interval may be made larger than 1 time, for example, 2 times. Note that this magnification may also be determined based on the difference between the previous BER value and the current BER value or the size ratio.

  As described above, in the fourth embodiment, the time interval of the timer 24 is lengthened or shortened using the history, thereby reducing both power consumption and speeding up the timing for displaying the full-segment broadcasting. This improves user convenience.

(Mode setting)
Further, the switching process to full segment broadcasting may be performed at a timing desired by the user. For example, when the switch button 4 is pressed by the user, a full segment video output process (FIG. 7) may be executed to switch from one segment broadcasting to full segment broadcasting. The mode switched at the user's timing is called “manual mode”, and the mode automatically switched by the terminal is called “automatic mode”. These modes can be set through user operations on the terminal screen.

  FIG. 14 shows an example of a screen for setting a mode in the mobile phone 1 according to the present invention. Screen (a) is a screen example in a state where one-segment broadcasting or full-segment broadcasting is received. Here, when the user presses a key on the keyboard 2 (hereinafter referred to as a submenu key) assigned to the soft key “submenu” 501, a submenu is displayed (transition to screen (b)). Here, when “1 switching mode setting” is selected, a switching mode setting screen is displayed (transition to screen (c)). Here, when “1 manual mode” is selected, the manual mode is set. When “2 automatic mode” is selected, the automatic mode is set. In this way, the user can set the switching mode on the terminal screen. Such settings are stored in a predetermined area of the storage unit 12. Then, when the one-segment broadcasting is received, the setting is read, and if the automatic mode is set, the above-described switching determination process is executed. When the manual mode is set, the switching determination process is not executed.

(Threshold setting)
Furthermore, the user may be able to set the timer time, the one-segment broadcasting electric field strength threshold Et1, the full-segment electric field strength threshold Et2, and the like.

  For this purpose, a threshold table 600 as shown in FIG. 15 is stored in the storage unit 12. The threshold value table 600 includes items 601 and threshold values 602, each of which stores a value. In this example, the threshold value of the one-seg electric field strength is set to 4.5 dB, the threshold value of the full-seg electric field strength is set to 15.0 dB, and the timer time that the timer 24 measures is set to 0.5 seconds. .

  FIG. 16 shows an example of a screen for setting a threshold in the mobile phone 1 according to the present invention. Screen (a) is a screen example in a state where one-segment broadcasting or full-segment broadcasting is received. Here, when the user presses the submenu key, the submenu is displayed (transition to screen (b)). Here, if “4 threshold setting” is selected, a threshold setting screen is displayed (transition to screen (c)). In this screen, when the user presses the up / down key, the threshold value 702 increases or decreases, and when the “decision” key is pressed, the threshold is set to the displayed value. Further, as shown in the screen (d), all threshold values that can be set may be displayed as a list, and each may be selected to input a value. The value input here is set in the threshold value table 600.

(Long time mode)
In order to reduce power consumption, the threshold value can be adjusted in order to immediately switch to one-segment broadcasting when it is slightly out of the area where full-segment broadcasting can be received. However, it takes time for the user to set the threshold value one by one. Therefore, a set of threshold values is prepared in advance so that, for example, when a mode such as “long viewing mode” or “full segment priority mode” is switched, the threshold value of the set can be set. Good. In this case, the user only needs to set the mode, which improves usability.

  For this purpose, the mode correspondence table 800 is held in the storage unit 12 of the mobile phone 1. An example of the contents of the mode correspondence table 800 is shown in FIG. The mode correspondence table 800 includes items such as a mode 801, a one-segment BER value threshold 802, a full-segment BER value threshold 803, a one-segment electric field strength threshold 804, a full-segment electric field strength threshold 805, and a timer time 806.

  The modes include, for example, “long viewing mode” and “full segment priority mode”. In the long-time viewing mode, if the reception environment of the full-segment broadcasting becomes even a little worse, it is a mode that allows the user to watch as long as possible by switching to the one-segment broadcasting immediately. On the other hand, the full segment priority mode is a mode that allows the full segment broadcast to be viewed as much as possible even if the reception environment of the full segment broadcast is somewhat bad, and the threshold is generally lower than the long-time viewing mode. .

  The mode can be held as a variable on a program stored on the storage unit 12 or a value on a register. When a mode is selected, a threshold value and a timer time corresponding to the selected mode are acquired, and values are set in variables indicating the respective values.

  In this way, the user can set values such as a plurality of thresholds only by changing the mode, and usability is improved.

(Battery level)
Furthermore, the one-segment broadcasting that can be viewed with low power consumption may be preferentially selected depending on the remaining battery level of the mobile phone 1. For example, when the remaining battery level decreases while watching full-segment broadcasting, switching to one-segment broadcasting is performed. As a result, the power consumption can be suppressed, so that the user can watch the broadcast for a longer time.

  For this purpose, for example, a battery remaining amount acquisition unit 25 is added to the configuration of FIG. 1 (not shown). The remaining battery level acquisition unit 25 acquires the remaining battery level of the mobile phone 1. The remaining battery level is a value indicating the remaining time during which the mobile phone 1 can be operated by the battery that supplies power to the mobile phone 1. Moreover, it is not limited to time, and it may be a value indicating a percentage as a percentage compared to when the battery is fully charged. In addition, it may be indicated not by an accurate ratio but by a value that can be used to understand the approximate remaining time, for example, a scale of about three stages such as a low remaining state, a half state, and a state near full charge. . In general, the mobile phone 1 displays a scale indicating the remaining battery level above the standby screen.

  Next, with reference to FIG. 18, a processing flow of the remaining battery level determination process in which the remaining battery level is acquired by the remaining battery level acquisition unit 25 during full-segment broadcasting viewing and is switched to one-segment broadcasting when the remaining battery level is low. To do. The battery remaining amount determination process is started by interruption of a predetermined period during full segment broadcasting viewing. When the remaining battery level determination process is started, the control unit 11 acquires the remaining battery level by the remaining battery level acquiring unit 25 (step S701). Next, a predetermined battery remaining amount threshold value Vt is acquired. This Vt is a time such as 30 minutes, for example. Further, depending on the method of expressing the remaining battery level, it may be 25 percent or “scale 1”.

  Then, it is determined whether or not the acquired remaining battery level is smaller than the threshold value Vt (step S703). When the remaining battery level is smaller than the threshold value Vt (step S703; Yes), the broadcast to be displayed is switched from the full segment broadcast to the one segment broadcast (step S704). If the remaining battery level is greater than the threshold value Vt (step S703; No), the process ends without doing anything.

  Further, when the remaining battery level is reduced while receiving the one-segment broadcasting, even if the reception status of the full-segment broadcasting is recovered, the switching to the full-segment broadcasting may not be performed. By doing in this way, power consumption can be suppressed and viewing time can be lengthened.

  A processing flow in this case will be described with reference to FIG. First, processing similar to that in steps S401 to S402 in FIG. 10 is performed. When the timer 24 expires, the remaining battery level is acquired (step S801), and the remaining battery level threshold Vt is acquired (step S802). Then, it is determined whether or not the remaining battery level is smaller than the threshold value Vt (step S803). If it is smaller (step S803; Yes), the process returns to step S401 without performing any processing. If it is large (step S803; No), the process proceeds to step S301 to determine whether to switch to full segment broadcasting.

  Thus, when the remaining battery level is low, by not performing the switching determination process to full segment broadcasting, power consumption can be reduced, and the time during which one segment broadcasting can be viewed can be lengthened. As a result, user convenience is improved.

(Fresh One Seg, Yoko Full Seg)
Further, the television viewing style of the mobile phone 1 has a pattern as shown in FIG. FIG. 20A is an example of a display screen in a state where the display panel 5 of the mobile phone 1 is vertical, and FIG. 20B is an example of a display screen in a state where the display panel 5 of the mobile phone 1 is horizontal. . An image 901 in FIG. 20A is a small image because it has a size that matches the width of the display panel 5. Therefore, in this state, sufficient image quality can be obtained by displaying one segment. In addition, the video 902 in FIG. 20B is displayed in a larger size than that in FIG. In this case, since the difference in image quality between the one-segment broadcasting and the full-segment broadcasting is conspicuous, the full-segment broadcasting may be displayed. By controlling in this way, power consumption can be suppressed.

  In this case, for example, a viewing style acquisition unit 26 is added to the configuration of FIG. 1 (not shown). The viewing style acquisition unit 26 acquires whether the viewing style is the vertical mode as illustrated in FIG. 20A or the horizontal mode as illustrated in FIG. The viewing style can be changed, for example, when the user presses a key for changing the viewing style assigned to the keyboard 2 (hereinafter referred to as a viewing style change key). Specifically, a variable representing the viewing style is held on the program, and the value is changed according to the value, for example, the value 0 is the vertical mode and the value 1 is the horizontal mode. The viewing style acquisition unit 26 can determine the viewing style by acquiring the value of this variable. As another viewing style changing method, when the viewing style acquisition unit 26 acquires the open / closed state of the mobile phone 1 and the display unit 14 of the mobile phone 1 is opened, the vertical mode and the display unit are displayed. When the cover 14 is folded so that it comes to the front, it may be switched to the horizontal mode or the like. In addition, the viewing style acquisition unit 26 can notify the control unit 11 as an event on the program when the viewing style changes.

  A viewing style determination processing flow in the case of switching broadcasts to be displayed according to the viewing style will be described with reference to FIG. When the viewing style change is notified to the control unit 11 by the viewing style acquisition unit 26, the control unit 11 executes a viewing style determination process. First, the control unit 11 acquires a viewing style from the viewing style acquisition unit 26 (step S901). If the viewing style is the vertical mode (step S902; Yes), a process of switching to the one-segment broadcasting is executed (step S903). If the viewing style is the horizontal mode (step S902; No), the process is performed without doing anything. Exit.

As described above, when the viewing style is set to the vertical mode, the power consumption can be suppressed by switching to the one-segment broadcasting.
The viewing style may be other than the mode shown in FIG. For example, as shown in FIG. 20B, there may be one that displays a small image that is about half the width of the display panel 5 although it is in the horizontal direction. In this case, sufficient image quality can be obtained by displaying one segment as in the vertical mode. To control in this way, the viewing style acquisition unit 26 acquires the size of the video, and if the acquired size is smaller than a predetermined threshold, one segment is displayed, and if it is larger, full segment is displayed.

(Startup state Horizontal → Full, Vertical → One)
Next, an operation at the time of starting an application (hereinafter referred to as a TV application) for viewing one-segment broadcasting or full-segment broadcasting will be described. Whether the mobile phone 1 is waiting for phone calls, emails, key input by the user, etc. (hereinafter referred to as standby screen), whether it is one-segment broadcasting or full-segment broadcasting depending on the state of the cellular phone 1 when the TV application is started Select and start automatically.

  Specifically, there is a state of the mobile phone 1 as shown in FIG. When the TV application is activated with the display panel 5 opened as shown in FIG. 22 (a), the one-segment broadcasting is displayed. As shown in FIG. 22 (b), the display panel 5 is folded so as to come to the front. Select Full Seg broadcasting when starting the TV application.

  In addition, as shown in FIG. 22C, the mobile phone is provided with a hinge 1101 on the side when the housing of the portion where the keyboard is mounted is viewed from the front, and the housing of the portion where the display panel 5 is mounted. The body may be configured to open sideways. In this embodiment, when the screen is turned sideways, the keyboard 2 can be pressed down, which is convenient. When the mobile phone is set to the state shown in FIG. 22C and the TV application is started, full-segment broadcasting may be automatically selected.

  In addition, as shown in FIGS. 22D and 22E, a case of a slide-type mobile phone will be described. In the slide type mobile phone, the casing part on which the display panel 5 is mounted and the casing part on which the keyboard is mounted slide in parallel. In the closed state as shown in FIG. 22 (d), it is easy to view the television even when the mobile phone is turned sideways. Therefore, when the television application is activated in this state, full-segment broadcasting is selected. On the other hand, since the keyboard 2 can be operated in the opened state as shown in FIG. 22 (e), it is convenient to use the mobile phone in a portrait orientation. Therefore, when the TV application is activated in this state, one-segment broadcasting may be selected.

  Furthermore, as shown in FIGS. 22 (f) and 22 (g), a case of a mobile phone in which almost the entire case is the display unit 14 will be described. For example, this mobile phone is provided with an acceleration sensor 1102, and the orientation of the mobile phone can be detected. As the method, acceleration data is acquired from the acceleration sensor 1102, and when the acceleration data in the vertical direction (arrow 1103) is a positive value from the acceleration sensor 1102 to the display unit 14, the acceleration data is horizontal (FIG. 22 (f)). When the acceleration data in the direction opposite to the display unit 14 (arrow 1104) is a positive value from the acceleration sensor 1102, the orientation of the mobile phone is acquired based on a determination process such as portrait orientation (FIG. 22 (g)). . Therefore, when the TV application is activated when the mobile phone is in landscape orientation, full-segment broadcasting is selected, and when the TV application is activated when the mobile phone is in portrait orientation, one-segment broadcasting is selected. The position of the acceleration sensor is not limited to this, and it may be installed anywhere as long as the orientation of the mobile phone can be determined.

  Processing in this case will be described. When the activation of the TV application is instructed, the state of the mobile phone is acquired, and either one-segment broadcasting or full-segment broadcasting is selected according to the acquired state type. When selecting, a correspondence table stored in the storage unit 12 and describing the correspondence between the state of the mobile phone and the broadcast may be referred to.

  Thus, by automatically selecting and displaying either full-segment broadcasting or one-segment broadcasting according to the orientation and state of the mobile phone when starting the TV application, the user's trouble is saved and usability is improved. In addition, one-segment broadcasting is automatically selected and displayed on a small screen such as in the vertical mode, thereby reducing the power consumption of the mobile phone.

(BGM playback)
Furthermore, the TV style is output without displaying the TV image, and the display unit 14 displays other functions of the mobile phone such as mail, the Internet, a standby screen, a schedule, etc. (hereinafter referred to as BGM). Playback style). In this case, since the television image cannot be seen, it is not necessary to receive full-segment broadcasting with good image quality, and one-segment broadcasting is sufficient. Therefore, when switching to the BGM playback style while receiving full-segment broadcasting, control is performed so as to switch to one-segment broadcasting and output audio.

  In the mobile phone 1 in this case, the viewing style acquisition unit 26 acquires the viewing style, and when the viewing style is the BGM playback style, a process of switching to the one-segment broadcasting is performed. Further, when the viewing style is a style in which normal video is displayed from the BGM playback style and the mode is switched to the vertical mode, the video is displayed by switching to full segment broadcasting.

(temperature)
In addition, when the mobile phone 1 is receiving full-segment broadcasting, the current consumption is large, so that the descrambling unit 22 and the full-seg decoding unit 23 generate heat, and the temperature inside the mobile phone casing rises. Therefore, when the internal temperature of the mobile phone 1 reaches a temperature equal to or higher than a certain threshold, the mobile phone 1 may be automatically switched to one-segment broadcasting that can be received with low current consumption. In this case, a temperature sensor is added to the configuration of FIG.

  Thereby, it can suppress that the mobile telephone 1 becomes abnormally hot by heat_generation | fever, and a user's convenience improves.

(Pict display)
Furthermore, an identification mark indicating the type of broadcast being displayed may be displayed on the display panel 5 so that the broadcast being displayed can be immediately understood whether it is a one-segment broadcast or a full-segment broadcast. FIG. 23 is a screen display example when the identification mark is displayed on the display panel 5. FIG. 23A shows an example of a screen during reception of one-segment broadcasting, and an identification mark 1001 indicating that the one-segment broadcasting is being displayed is displayed. FIG. 23B is an example of a screen during reception of a full segment broadcast, and an identification mark 1002 indicating that the full segment broadcast is being displayed is displayed.

  In this way, by displaying the types of identification marks separately, it is immediately possible to determine whether the currently displayed broadcast is a one-segment broadcast or a full-segment broadcast, and the usability of the user is improved.

(Channels may be different)
Note that the switching between one-segment broadcasting and full-segment broadcasting is described assuming the same channel, but the present invention is not limited thereto.

  For example, when the reception state deteriorates while watching the program of the broadcast station “ABCD” by full-segment broadcasting, the program may be switched to the one-segment broadcasting of another broadcasting station “YYY”. This is achieved by determining broadcast stations to be selected for full-segment broadcasting and one-segment broadcasting, and holding identification information for identifying the broadcasting stations in the storage unit 12 in association with the one-segment broadcasting or the full-segment broadcasting.

  Here, different channels have different frequencies for transmitting broadcast waves, but there is a correlation in reception status. For example, in the interval between high-rise buildings, the direct wave directly reaching from the broadcasting station and the reflected wave reaching through a plurality of paths interfere with each other, so that the reception status of any broadcast wave is likely to deteriorate. Therefore, by monitoring the reception status of the one-segment broadcasting, the reception status can be predicted even in the full-segment broadcasting of different channels.

  Further, at the time of switching, control may be performed so as to receive radio waves of all receivable broadcasting stations and display programs of broadcasting stations with the best reception conditions. Thereby, since the user can view the broadcast in a good reception state, the usability is improved.

It is a block diagram which shows the structure of the mobile telephone which concerns on embodiment of this invention. It is an external view when it sees from the front in the state which opened the mobile telephone shown in FIG. It is explanatory drawing which shows the frequency band of a 1 segment and a full segment. It is explanatory drawing which shows the area which can receive the electric wave of each 1seg and a full segment. It is a detailed block diagram of a one-segment tuner. It is the figure which showed the graph which plotted the time change of the BER value. It is a flowchart of the full segment video output process which switches from the video display of one segment broadcast to the video display of full segment broadcast. It is a flowchart of the switching determination process of Embodiment 1 which intermittently receives the electric field strength of full segment broadcasting. 12 is a flowchart of switching determination processing according to the second embodiment for receiving the electric field strength of full-segment broadcasting based on the value of electric field strength of one-segment broadcasting. It is a flowchart of the switching determination process of Embodiment 3 which performs the process which receives the electric field strength of full segment broadcasting intermittently by the electric field strength of one segment broadcasting. It is a flowchart of the switching determination process which switches to full segment broadcasting using the value of BER value and electric field strength. It is the figure which showed the graph which plotted the time change of the BER value when the time interval to acquire is changed on the way. 14 is a flowchart of processing for changing a time interval for acquiring a BER value in the fourth embodiment. It is a setting screen of switching mode. It is a table of threshold values. It is a setting screen of a threshold value. It is the figure which showed the contents of the mode correspondence table. It is a flowchart of the battery remaining amount determination process which switches from full segment to one segment using a battery remaining amount. It is a flowchart of the switching determination process at the time of determining whether to switch from one seg to full seg using a battery remaining amount. It is the figure which showed the example of a display screen for every viewing style. It is a flowchart of a viewing style determination process for switching from full segment to one segment depending on the viewing style. It is a figure which shows the state of a mobile telephone. It is an example of a screen display at the time of displaying the identification mark of one-segment broadcasting and full-segment broadcasting.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile phone, 2 ... Keyboard, 3 ... Cursor key, 4 ... Switching button, 5 ... Display panel, 6 ... Calling microphone, 7 ... Calling speaker, 8 ... Speaker, 11 ... Control part, 12 ... Memory | storage part, DESCRIPTION OF SYMBOLS 13 ... Operation part, 14 ... Display part, 15 ... One segment tuner, 16 ... One segment decoding part, 17 ... Audio | voice output part, 18 ... Audio | voice input part, 19 ... Communication part, 20 ... Bus, 21 ... Full segment tuner, 22 ... De Scramble unit, 23 ... full segment decoding unit, 24 ... timer, 25 ... remaining battery level acquisition unit, 26 ... viewing style acquisition unit

Claims (14)

A first tuner for receiving first television data;
A second tuner for receiving second television data having a larger amount of data than the first television data;
Reproduction means for reproducing the first television data received by the first tuner or the second television data received by the second tuner;
Whether or not the reception status of the second television data of the second tuner is better than a predetermined standard when the reproduction means is reproducing the first television data. A reception status determination means for repeatedly determining in,
When the reception status determining unit determines that the reception status is better than a predetermined reference, the playback unit plays back the second television data instead of the first television data. Control means to control,
History storage means for storing a history of reception status of the second television data received by the second tuner,
The reception status determination unit varies a cycle for determining whether or not the reception status is good according to the history of the reception status stored in the history storage unit.
The video playback apparatus according to claim and this. A first tuner for receiving first television data;
A second tuner for receiving second television data having a larger amount of data than the first television data;
Reproduction means for reproducing the first television data received by the first tuner or the second television data received by the second tuner;
When the reproduction means is reproducing the first television data, it is determined whether or not the reception status of the second television data of the second tuner is better than a predetermined standard. Reception status determination means for determining by timing;
When the reception status determining unit determines that the reception status is better than a predetermined reference, the playback unit plays back the second television data instead of the first television data. Control means to control,
With
The reception status determination means includes
First reception status determination means for determining whether the reception status of the first television data of the first tuner is better than a predetermined reference;
When the first reception status determination unit determines that the reception status of the first television data is better than a predetermined standard, the reception status of the second television data is lower than the predetermined standard. Determine if it ’s good ,
A first threshold that is a reference when the first reception status determination unit determines the reception status of the first television data, and the reception status determination unit determines the reception status of the second television data. Mode threshold value indicating a correspondence relationship between a second threshold value which is a reference for performing the playback and a playback mode indicating which of the first television data and the second television data is to be displayed with priority Mode threshold correspondence storage means for storing a correspondence table;
A video playback apparatus , further comprising: threshold setting means for setting the first threshold and the second threshold corresponding to the set playback mode based on the mode threshold correspondence table . 3. The video reproduction apparatus according to claim 2, wherein the first reception status determination unit determines whether or not the reception status is better than a predetermined reference at predetermined time intervals. The first reception status determination unit determines whether or not an electric field strength value of the first television data received by the first tuner is better than a predetermined reference value. Item 4. The video playback device according to Item 2 or 3. The first reception status determining means determines whether or not a reception error rate of the first television data received by the first tuner is better than a predetermined reference value. Item 4. The video playback device according to Item 2 or 3. The reception status determining means determines whether or not the electric field strength value of the second television data received by the second tuner is better than a predetermined reference value. 6. The video reproduction device according to any one of items 1 to 5. The reception status determining means determines whether or not a reception error rate of the second television data received by the second tuner is better than a predetermined reference value. 6. The video reproduction device according to any one of items 1 to 5. The reception status determination unit determines whether or not the reception status is good when the reception status history stored in the history storage unit indicates that the reception status tends to improve. The video playback device according to claim 1 , wherein the period is shortened. A battery for supplying power;
A battery remaining amount obtaining means for obtaining the remaining amount of the battery,
The control means determines whether the reproduction means reproduces the first television data or the second television data based on the battery remaining amount acquired by the battery remaining amount acquisition means. video reproducing apparatus according to any one of claims 1 8, characterized in that. The control means controls the reproduction means to reproduce the first television data when the battery remaining amount acquired by the battery remaining amount acquisition means is equal to or less than a predetermined value. The video reproduction apparatus according to claim 9 . A first tuner for receiving first television data;
A second tuner for receiving second television data having a larger amount of data than the first television data;
Reproduction means for reproducing the first television data received by the first tuner or the second television data received by the second tuner;
Whether or not the reception status of the second television data of the second tuner is better than a predetermined standard when the reproduction means is reproducing the first television data. A reception status determination means for repeatedly determining in,
When the reception status determining unit determines that the reception status is better than a predetermined reference, the playback unit plays back the second television data instead of the first television data. Control means to control,
Display means for displaying television data reproduced by the reproduction means;
E Bei and a display size acquisition unit that acquires the display size of the television data on the display means,
The control means determines, based on the display size acquired by the display size acquisition means, whether the reproduction means reproduces the first television data or the second television data. It characterized Film image reproducing apparatus. The control means controls the reproduction means to reproduce the first television data when the display size acquired by the display size acquisition means is equal to or smaller than a predetermined size, and acquires the display size. 12. The video playback apparatus according to claim 11 , wherein when the display size acquired by the means is larger than the predetermined size, the playback means is controlled to play back the second television data. A first tuner for receiving first television data;
A second tuner for receiving second television data having a larger amount of data than the first television data;
Reproduction means for reproducing the first television data received by the first tuner or the second television data received by the second tuner;
Whether or not the reception status of the second television data of the second tuner is better than a predetermined standard when the reproduction means is reproducing the first television data. A reception status determination means for repeatedly determining in,
When the reception status determining unit determines that the reception status is better than a predetermined reference, the playback unit plays back the second television data instead of the first television data. Control means to control,
And an audio output means for outputting the audio of the television data to which the reproducing means reproduces,
The control means controls the reproduction means to reproduce the first television data when the audio output means outputs only the audio of the television data reproduced by the reproduction means. that Film image reproducing apparatus. Computer
Reproducing means for reproducing the first television data received by the first tuner or the second television data having a larger data amount than the first television data received by the second tuner;
Whether or not the reception status of the second television data of the second tuner is better than a predetermined standard when the reproduction means is reproducing the first television data. Reception status determination means for repeatedly determining with,
When the reception status determining unit determines that the reception status is better than a predetermined reference, the playback unit plays back the second television data instead of the first television data. Control means to control,
Functioning as history storage means for storing a history of reception status of the second television data received by the second tuner,
The reception status determination unit varies a cycle for determining whether or not the reception status is good according to the history of the reception status stored in the history storage unit.
Program which is characterized a call.

Images