JP2007110444A - Portable digital television broadcast receiver, and portable telephone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable digital television broadcast receiver and a portable telephone which displays that modulated synchronizing signals of digital television broadcast waves are detected on the screen, and informs a user that they are within a broadcast area. <P>SOLUTION: A field intensity detector 7 in a broadcast receiver 3 detects the field intensity of received broadcast waves and outputs it to a controller 8. The controller 8 actuates a display 9 to show a digital television broadcast area on the display 9, based on modulated synchronizing signals inputted from a synchronizer 5; and to show a digital television receiving level on the display 9, based on the field intensity signal of the received broadcast waves inputted from the field intensity detector 7. Upon detection of the modulated synchronizing signals from received broadcast waves converted to digital base band signals by a receiver 4, the synchronizer 5 actuates the display 9 to shows the indication that the receiver is within the digital television broadcast area. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable digital television broadcast receiver and a mobile phone that appropriately display radio wave reception status.

  Conventionally, as a reception status display method for displaying the reception status of radio waves in a portable wireless terminal such as a portable digital television broadcast receiver or a mobile phone, a plurality of threshold values are set according to the received electric field level as an antenna bar. A configuration is generally known that displays on the screen unit, and displays that when the received electric field level is less than or equal to the out-of-range determination level.

Also known is a configuration in which a plurality of light emitters are provided on the surface of a mobile phone and the reception status of radio waves is displayed by changing the number of light emission of these light emitters according to the received electric field level (for example, patents). Reference 1). According to this technique, it is possible to easily check what electric field strength the mobile phone is in while the mobile phone is being used. Furthermore, it is possible to always keep a good communication state by moving in the direction in which many light emitters are lit.
JP 7-273720 A

  However, in the above-described configuration example of display by the conventional mobile phone, if the received electric field level is equal to or lower than the out-of-range determination level, even if the modulation synchronization signal of the digital TV broadcast wave can be detected, it is displayed as out-of-range. The user cannot determine whether or not the current location is within the service area. Also, in analog television broadcasting, the degradation of the received signal quality and the degradation of the video quality are in a linear relationship, and within the service area, even if the received signal quality is low, a distorted video is displayed and the video is in the service area. However, in digital TV broadcasting, when the error rate of the received signal is above a certain level even in the service area, no video is displayed and the user is in the service area. May be outside the service area.

  The present invention has been made in view of the above points, and provides a portable digital television broadcast receiver and a mobile phone that can clearly notify a user that they are within a digital television broadcast service area. With the goal.

  In order to achieve the above object, a portable digital television broadcast receiver according to the present invention is a portable digital television broadcast receiver that displays the reception status of radio waves, and is a broadcast that receives digital television broadcast waves. A configuration is provided that includes a receiving unit, and a display unit that displays a reception level of a digital television broadcast wave received by the broadcast receiving unit and displays a digital television broadcast area. According to such a configuration, the user can easily determine whether or not the user is within the digital television broadcast area.

  Further, in the portable digital television broadcast receiver according to the present invention, in the configuration of the invention, the reception level is a reception electric field intensity detected by the broadcast reception unit, a reception data error rate, or a carrier signal to noise level ratio. The received signal quality corresponding to any one or more of them is displayed, and the display unit is configured to display the received level when video or audio having a quality of a predetermined level or higher can be demodulated. . According to such a configuration, the user can accurately grasp the reception status of the digital television broadcast.

  In the portable digital television broadcast receiver according to the present invention, in the configuration of the invention, the display of the digital television broadcast area is detected by the modulation synchronization signal of the digital television broadcast wave received by the broadcast receiving unit. It adopts a configuration that corresponds to the presence or absence. According to such a configuration, the user can accurately determine whether or not the user is within the digital television broadcast area.

  In the portable digital television broadcast receiver according to the present invention, in the configuration of the invention, the lowest received electric field strength at which the digital television broadcast area is displayed is lower than the lowest received electric field strength at which the reception level is displayed. It adopts a configuration that is set low. According to such a configuration, the user can easily determine whether or not the user is within the broadcast area even if the reception situation of the digital television broadcast is bad.

  The mobile phone according to the present invention is a mobile phone that displays the reception status of radio waves, a broadcast receiving unit that receives digital television broadcast waves, and a reception level of the digital television broadcast waves received by the broadcast receiving unit. And a display unit for displaying the digital television broadcast area. According to such a configuration, the user can accurately grasp the reception status of the digital television broadcast.

  In the mobile phone according to the present invention, in the configuration of the invention, the display unit displays the reception level and the digital television broadcast area during the mobile phone operation. According to such a configuration, the user can accurately grasp the reception status of the digital television broadcast even when the mobile phone function is being used.

  In the mobile phone according to the present invention, in the configuration of the invention, when the display unit switches from the mobile phone operation to the operation of receiving a digital television broadcast wave, the digital television broadcast area is not displayed. The structure which displays the warning to that effect is taken. According to such a configuration, when it is outside the digital television broadcast area, the operation is not switched to the digital television broadcast reception operation, so that power consumption can be reduced.

  The mobile phone according to the present invention employs a configuration in which, in the configuration of the present invention, the display unit displays a reception level during reception of a digital television broadcast wave. According to such a configuration, the user can accurately grasp the reception status of the mobile phone even while viewing a digital television broadcast.

  In the mobile phone according to the present invention, in the configuration of the invention, when the display unit switches from the operation of receiving a digital television broadcast wave to the operation of the mobile phone, the displayed reception level is not more than a predetermined value. Is configured to display a warning to that effect. According to such a configuration, since the mobile phone is not switched to the mobile phone operation when the mobile phone is out of the service area, the convenience for the user can be further enhanced.

  According to the present invention, it is possible to clearly notify the user whether or not the portable digital television broadcast receiver or the mobile phone is within the service area of the digital television broadcast. Therefore, it is possible to provide a portable digital television broadcast receiver and a mobile phone with improved convenience.

<Summary of invention>
The portable digital television broadcast receiver of the present invention includes at least a broadcast receiving unit that receives a digital television broadcast wave and a display unit, and the display unit receives the digital television broadcast wave received by the broadcast receiving unit. The reception level is displayed and the digital television broadcast area is displayed. The received level displayed at this time indicates the received signal quality corresponding to any of the received electric field strength, the received data error rate, or the carrier signal to noise level ratio detected by the broadcast receiving unit. The unit displays the reception level when video or audio having a quality of a predetermined level or higher can be demodulated. The display of the digital television broadcast area corresponds to the presence or absence of detection of the modulation synchronization signal of the digital television broadcast wave received by the broadcast receiving unit. With such a configuration, the user can easily determine whether or not the user is in the digital television broadcast area and can accurately grasp the reception status of the digital television broadcast.

  The mobile phone of the present invention is a mobile phone comprising a broadcast receiving unit for receiving digital television broadcast waves and a display unit, wherein the display unit displays a reception level and digital television during operation of the mobile phone. The broadcast area is displayed. Further, when switching from the mobile phone operation to the operation of receiving digital television broadcast, a warning to that effect is displayed if the digital television broadcast area is not displayed. Further, the reception level of the mobile phone is displayed on the display unit during reception of the digital television broadcast wave. When switching from the operation of receiving a digital television broadcast wave to the operation of a mobile phone, a warning to that effect is displayed when the display of the reception level on the mobile phone is below a predetermined value. With this configuration, the user can accurately grasp the reception status of the digital television broadcast wave even when the mobile phone function is being used, and the user is outside the area of the digital television broadcast wave. In this case, since the operation is not switched to the digital television broadcast wave receiving operation, power consumption can be reduced. Furthermore, since the mobile phone is not switched to the mobile phone operation when the mobile phone is out of service area, the convenience for the user can be further enhanced.

  Hereinafter, some embodiments of a portable digital television broadcast receiver and a mobile phone according to the present invention will be described in detail with reference to the drawings. Note that in the drawings used in the embodiments, the same components are denoted by the same reference numerals, and redundant description is omitted as much as possible.

<Embodiment 1>
FIG. 1 is a block diagram showing a configuration of a portable digital television broadcast receiver according to Embodiment 1 of the present invention. In FIG. 1, a portable digital television broadcast receiver 1 includes an antenna 2 for receiving a digital television broadcast wave, a broadcast receiving unit comprising a receiving unit 4, a synchronizing unit 5, a demodulating unit 6, and an electric field strength determining unit 7. 3, a control unit 8 that performs control for reproducing a video signal and an audio signal, a display unit 9 that reproduces a video signal input from the demodulation unit 6, and an audio signal input from the demodulation unit 6 The audio playback unit 10 is provided.

  Next, the operation of the portable digital television broadcast receiver 1 having the configuration shown in FIG. 1 will be schematically described. The digital television broadcast wave is received by the antenna 2 provided inside or on the surface of the main body 1 and input to the broadcast receiving unit 3. In the broadcast receiving unit 3, the receiving unit 4 converts a received broadcast wave (that is, a digital television broadcast wave) input from the antenna 2 into a digital baseband signal. The synchronization unit 5 detects the modulation synchronization signal from the received broadcast wave converted into the digital baseband signal, and outputs it to the demodulation unit 6 and the control unit 8.

  The demodulation unit 6 converts the received broadcast wave converted into the digital baseband signal into a video signal and an audio signal with reference to the modulation synchronization signal input from the synchronization unit 5, and outputs it to the control unit 8. The electric field strength determination unit 7 detects the electric field strength of the received broadcast wave and outputs it to the control unit 8. The control unit 8 causes the display unit 9 to reproduce the video signal input from the demodulation unit 6, and causes the audio reproduction unit 10 to reproduce the audio signal input from the demodulation unit 6. Further, the control unit 8 displays the digital television broadcast area on the display unit 9 based on the modulation synchronization signal input from the synchronization unit 5, and receives the received electric field strength signal input from the electric field strength determination unit 7. Originally, the digital television reception level is displayed on the display unit 9.

  The display unit 9 is a video display device including elements such as organic EL (Electro Luminescence) made of a light emitter such as liquid crystal or diamine. The audio reproduction unit 10 is an audio output device configured by elements such as a speaker and an earphone.

  Next, in the portable digital television broadcast receiver 1 of the first embodiment configured as shown in FIG. 1, a method for displaying the reception status of the digital television broadcast wave on the display unit 9 in the following three states: This will be described with reference to FIGS. 2, 3, and 4. FIG. FIG. 2 is a diagram showing an example of a display state when the received electric field strength is high (state 1) in display unit 9 of the portable digital television broadcast receiver according to Embodiment 1 of the present invention. FIG. 3 shows a display in the display unit 9 of the portable digital television broadcast receiver according to Embodiment 1 of the present invention when the received electric field strength is low but the modulation synchronization signal can be received (state 2). It is a figure which shows an example of a state. Furthermore, FIG. 4 shows an example of the display state when the reception electric field strength is low and the modulation synchronization signal cannot be received (state 3) in the display unit 9 of the portable digital television broadcast receiver according to Embodiment 1 of the present invention. FIG. FIG. 5 is a diagram showing a display example of each state of the broadcast wave reception status displayed in the margin of the display unit 9 of the portable digital television broadcast receiver according to Embodiment 1 of the present invention. FIG. 5 is also referred to accordingly.

  When the reception electric field strength of the digital television broadcast wave is sufficiently high so that the video can be viewed (state 1), as shown in FIG. 2, for example, an antenna bar is displayed as a reception level display in the upper margin of the display unit 9. . For example, as shown in FIG. 5, the number of antenna bars is increased or decreased in conjunction with the set value of the received electric field strength. That is, as shown in the display example of FIG. 2, when all three antenna bars are displayed, as shown in FIG. 5, the received electric field intensity is −50 dBm or more and a level at which good image quality can be obtained ( It shows that the state is 1). In this state (state 1), since the modulation synchronization signal of the digital television broadcast wave is naturally detected, it is determined that the digital synchronization signal is within the digital television broadcast area by detecting the modulation synchronization signal. For example, a DTV mark is displayed next to the antenna bar display.

  Further, the received electric field strength of the digital television broadcast wave is reduced to a level at which the video cannot be viewed (less than −110 dBm), but the modulation synchronization signal of the digital television broadcast wave can be detected by the synchronization unit 5 ( In state 2), as shown in FIG. 3, zero antenna bars are displayed, indicating that video cannot be viewed. However, since the DTV mark as the broadcast area display is displayed, the user can know that he is in the broadcast area of the digital television broadcast.

  It should be noted that the received electric field strength of the digital television broadcast wave is lower than −50 dBm and a level at which good image quality can be obtained (state 1), and the received electric field strength is reduced to a level at which video cannot be viewed (less than −110 dBm). However, in each state up to the case where the synchronization synchronizing signal of the digital television broadcast wave can be detected by the synchronizing unit 5 (state 2), the number of antenna bars changes stepwise as shown in FIG. Is displayed. That is, in the state 1a of the reception electric field strength (−80 dBm or more, less than −50 dBm) slightly lower than that in the state 1, two antenna bars are displayed, and further, the reception electric field strength slightly lower than the state 1a (−110 dBm or more, less than −80 dBm) In the state 1b), one antenna bar is displayed.

  In addition, when the reception electric field strength of the broadcast wave is lowered to a level at which the video cannot be viewed and the modulation synchronization signal of the broadcast wave cannot be detected by the synchronization unit 5 (state 3), as shown in FIG. In the upper margin of the display unit 9, for example, an antenna bar and a DTV mark are not displayed. Thereby, the user can know that he / she is outside the broadcasting area of the digital television broadcasting.

  By the display operation linked to the received electric field strength as described above, it is impossible for the user to determine whether or not the present location is within the digital television broadcast service area while the portable digital television broadcast receiver 1 is moving. Even in the case, the detection information (that is, the DTV mark) of the modulation synchronization signal is displayed on the display unit as a broadcast area display, so that even if the received electric field strength is reduced to a level at which video cannot be reproduced, The user can be notified whether or not there is. Therefore, the user can increase the viewing chance by frequently trying to receive broadcasts in the service area based on the detection information (DTV mark).

  In the first embodiment, as shown in FIG. 5, the configuration using a maximum of three antenna bar displays proportional to the received electric field strength as the reception level display is shown. However, the maximum number of antenna bars is not limited. I do not care. In the first embodiment, the number of antenna bars proportional to the received electric field strength is displayed. However, the present invention is not limited to this, and any display method that can realize display proportional to the received electric field strength can be used. Needless to say, the present invention is realized. Furthermore, in the first embodiment, when the received electric field strength is reduced to a level at which video cannot be viewed, the configuration in which zero antenna bars are displayed is shown. However, the received electric field strength is low. As shown, it goes without saying that the present invention can be realized even when the display is performed using marks or characters such as out-of-service marks.

<Embodiment 2>
FIG. 6 is a block diagram showing a configuration of a portable digital television broadcast receiver according to Embodiment 2 of the present invention. The difference between the portable digital television broadcast receiver 1 according to the second embodiment and the first embodiment is that in the first embodiment, the broadcast receiving unit 3 includes the electric field strength determining unit 7. In FIG. 2, the broadcast receiving unit 11 includes an error rate determining unit 12. Thus, since the structure of a broadcast receiving part is different, the code | symbol of the broadcast receiving part 3 of Embodiment 1 is changed with the broadcast receiving part 11 in Embodiment 2. FIG.

  In FIG. 6, the broadcast receiving unit 11 includes a receiving unit 4, a synchronizing unit 5, a demodulating unit 6, and an error rate determining unit 12 that calculates a received data error rate of a received broadcast wave. The error rate determination unit 12 calculates the reception data error rate of the received broadcast wave and outputs it to the control unit 8. Then, the control unit 8 displays the digital television broadcast area on the display unit 9 based on the modulation synchronization signal input from the synchronization unit 5 and the received data error rate input from the error rate determination unit 12. Originally, the digital television reception level is displayed on the display unit 9. Since other configurations and operations are the same as those in the first embodiment, a duplicate description is omitted.

  Next, in the portable digital television broadcast receiver 1 according to the second embodiment configured as shown in FIG. 6, the display unit 9 displays the reception status of the digital television broadcast wave in the following three states. Will be described with reference to FIG. 2, FIG. 3, and FIG. In the second embodiment, the case where the reception electric field strength in FIG. 2 is high (state 1) is read as the case where the reception data error rate is low (state 11). The reception electric field strength in FIG. The case where reception is possible (state 2) is read as the case where the reception data error rate is slightly high but the modulation synchronization signal is receivable (state 12). The case where the data cannot be received (state 3) is read as the case where the reception data error rate is high and the modulation synchronization signal cannot be received (state 13). Further, FIG. 7 is a diagram showing a display example of each state of the broadcast wave reception status displayed in the margin of the display unit 9 of the portable digital television broadcast receiver according to Embodiment 2 of the present invention. FIG. 7 is also referred to accordingly.

  A method for displaying the reception status of the digital television broadcast wave on the display unit 9 in the portable digital television broadcast receiver configured as shown in FIG. 6 will be described in the following three states. When the received data error rate of the digital television broadcast wave is low and a video can be viewed (state 11), for example, an antenna bar is displayed as a reception level display in the upper margin of the display unit 9, for example, as shown in FIG. . The number of antenna bars is increased / decreased in conjunction with the received data error rate by setting values as shown in FIG. 7, for example, and the number of antenna bars is increased as the received data error rate is lower.

  For example, when all three antenna bars are displayed as shown in the display example of FIG. 2, the received data error rate is 0% as shown in the state 11 of FIG. It shows that good image quality can be obtained. Further, in this state (that is, state 11), the modulation synchronization signal of the digital television broadcast wave is naturally detected. Therefore, the detection of the modulation synchronization signal determines that it is within the digital television broadcast area. As shown in FIG. 2, for example, a DTV mark is displayed beside the antenna bar display.

  Further, when the broadcast wave reception data error rate has deteriorated to a level at which video cannot be viewed but the modulation synchronization signal of the broadcast wave can be detected by the synchronization unit 5 (state 12), as shown in FIG. The antenna bar is displayed as 0, indicating that the video cannot be viewed. However, since the DTV mark as the broadcast area display is displayed, the user can know that he is in the broadcast area of the digital television broadcast. Such a state 12 is when the received data error rate exceeds 60% as shown in FIG.

  Note that the reception data error rate of the digital television broadcast wave is 0% and a level at which good image quality can be obtained (state 11), the reception data error rate is a level at which video cannot be viewed (60% <data error rate). However, in each state up to the case where the synchronization synchronizing signal of the digital television broadcast wave can be detected by the synchronization unit 5 (state 12), the number of antenna bars is gradually increased as shown in FIG. Changes and is displayed. That is, in the state 11a where the reception data error rate is slightly higher than the state 11 where the reception data error rate is 0% (0% <data error rate ≦ 30%), the number of the antenna bars is two, and is slightly higher than that in the state 11a. In the state 11b of the reception data error rate (30% <data error rate ≦ 60%), one antenna bar is displayed.

  Also, when the broadcast wave reception data error rate deteriorates to a level at which video cannot be viewed, and the modulation synchronization signal of the broadcast wave cannot be detected by the synchronization unit 5 (state 13), as shown in FIG. In the upper margin of the display unit 9, for example, an antenna bar or a DTV mark is not displayed. Thereby, the user can know that he / she is outside the broadcasting area of the digital television broadcasting.

  With the display operation as described above, even when the portable digital television broadcast receiver 1 is moving and the user cannot determine whether or not the current location is within the service area of the digital television broadcast, the modulation synchronization signal By displaying the detected information on the display unit as a broadcast area display, it is possible to notify the user whether or not the received data error rate is within the service area even if the received data error rate has deteriorated to a level at which video cannot be reproduced. Therefore, based on this information, the user can increase the viewing chance by frequently trying to receive broadcasts in the service area.

  In the second embodiment, the configuration using up to three antenna bar displays linked to the reception data error rate as the reception level display is shown. However, the maximum number of antenna bars may be any number, and reception may be performed. The present invention can be realized as a configuration using any other display method capable of performing display linked to the data error rate. Further, in the second embodiment, when the reception data error rate has deteriorated to a level at which video cannot be viewed, a configuration is shown in which zero antenna bars are displayed. However, the reception data error rate is poor. As an indication of this, the present invention can also be realized as a configuration in which display is performed using marks or characters such as out-of-service marks.

<Embodiment 3>
FIG. 8 is a block diagram showing a configuration of a portable digital television broadcast receiver according to Embodiment 3 of the present invention. The difference between the portable digital television broadcast receiver 1 according to the third embodiment and the first embodiment is that, in the first embodiment, the broadcast receiving unit 3 includes the electric field strength determining unit 7. In FIG. 3, the broadcast receiving unit 13 includes a level determining unit 14. Since the configuration of the broadcast receiving unit is thus different, the code of the broadcast receiving unit 3 of the first embodiment is changed from that of the broadcast receiving unit 13 in the third embodiment.

  In FIG. 8, the broadcast receiving unit 13 includes a receiving unit 4, a synchronizing unit 5, a demodulating unit 6, and a level determining unit 14 that calculates a carrier signal-to-noise ratio of a received broadcast wave. The level determination unit 14 calculates the carrier signal-to-noise ratio of the received broadcast wave and outputs it to the control unit 8. Then, the control unit 8 displays the digital television broadcast area on the display unit 9 based on the modulation synchronization signal input from the synchronization unit 5, and calculates the carrier signal-to-noise ratio input from the level determination unit 14. Originally, the digital television reception level is displayed on the display unit 9. Since other configurations and operations are the same as those in the first embodiment, a duplicate description is omitted.

  Next, in the portable digital television broadcast receiver 1 according to the second embodiment configured as shown in FIG. 8, the display unit 9 displays the reception status of the digital television broadcast wave in the following three states. Will be described with reference to FIG. 2, FIG. 3, and FIG. In the third embodiment, the case where the received electric field strength in FIG. 2 is high (state 1) is read as the case where the carrier signal-to-noise ratio is high (state 21), and the received electric field strength in FIG. 4 (state 2) is read as the case where the carrier signal-to-noise ratio is low but the modulation synchronization signal is receivable (state 22). Furthermore, the reception electric field strength in FIG. The case where the signal cannot be received (state 3) is read as the case where the carrier signal-to-noise ratio is low and the modulation synchronization signal cannot be received (state 23). FIG. 9 is a diagram showing display examples of each state of the broadcast wave reception status displayed in the margin of the display unit 9 of the portable digital television broadcast receiver according to Embodiment 3 of the present invention. FIG. 9 is also referred to accordingly.

  When the carrier signal-to-noise ratio of the digital television broadcast wave is sufficiently high (state 21), as shown in FIG. 2, for example, an antenna bar is displayed as a reception level display in the upper margin of the display unit 9, for example. Display. The number of antenna bars is increased or decreased in association with the carrier signal-to-noise ratio by a set value as shown in FIG. 9, for example. When all three antenna bars are displayed as shown in the display example of FIG. 2, the carrier signal to noise ratio is high (that is, the carrier signal to noise ratio is 30 dBm or more as shown in FIG. 9). It shows that good image quality can be obtained. In this state, since the modulation synchronization signal of the digital television broadcast wave is naturally detected, it is determined that it is within the digital television broadcast area by detecting the modulation synchronization signal, and the broadcast area display is shown in FIG. For example, a DTV mark is displayed next to the antenna bar display.

  Further, when the carrier signal-to-noise ratio of the digital television broadcast wave has deteriorated to a level at which video cannot be viewed, but the modulation synchronization signal of the broadcast wave can be detected by the synchronization unit 5 (state 22), FIG. As shown in FIG. 3, the antenna bar is displayed as 0, indicating that the video cannot be viewed. However, since the DTV mark as the broadcast area display is displayed, the user can know that he is in the broadcast area of the digital television broadcast.

  It should be noted that the carrier signal-to-noise ratio of digital television broadcast waves is 30 dBm or higher and a good image quality can be obtained (state 21) to a level at which the carrier signal-to-noise ratio cannot be viewed (less than 10 dBm). Although the number of antenna bars decreases, the number of antenna bars changes stepwise as shown in FIG. 9 in each state up to the case where the synchronization synchronizing signal of the digital television broadcast wave can be detected by the synchronization unit 5 (state 22). Is displayed. That is, in the state 21a having a slightly lower carrier signal-to-noise ratio (20 dBm or more and less than 30 dBm) than the state 21, two antenna bars are displayed, and further, the carrier signal-to-noise ratio (10 dBm or more and less than 20 dBm) is slightly lower than in the state 21a. In the state 21b), the antenna bar becomes one display.

  Further, in the case where the carrier signal-to-noise ratio of the digital television broadcast wave is deteriorated to a level at which the video cannot be viewed, and the modulation synchronization signal of the broadcast wave cannot be detected by the synchronization unit 5 (state 23), FIG. As shown in the figure, for example, an antenna bar and a DTV mark are not displayed in the upper margin of the display unit 9. Thereby, the user can know that he / she is outside the broadcasting area of the digital television broadcasting.

  With the display operation as described above, even when the portable digital television broadcast receiver 1 is moving and the user cannot determine whether or not the current location is within the service area of the digital television broadcast, the modulation synchronization signal By displaying the detected information on the display unit 9 as a broadcast area display, even if the carrier signal-to-noise ratio has deteriorated to a level at which video cannot be reproduced, it is possible to notify the user whether or not it is within the service area. . Therefore, based on this information, the user can increase the viewing chance by frequently trying to receive broadcasts in the service area.

  In the third embodiment, the configuration using up to three antenna bar displays proportional to the carrier signal-to-noise ratio as the reception level display is shown. However, the maximum number of antenna bars may be any number, Needless to say, the present invention can be applied to a configuration using any display method capable of performing display in proportion to the carrier signal-to-noise ratio. In the third embodiment, when the carrier signal-to-noise ratio has deteriorated to a level at which video cannot be viewed, a configuration in which zero antenna bars are displayed is shown. Needless to say, the present invention can be applied to a configuration in which display is performed using marks or characters such as out-of-service marks.

<Embodiment 4>
FIG. 10 is a block diagram showing a configuration of the mobile phone according to Embodiment 4 of the present invention. A mobile phone 24 shown in FIG. 10 includes a mobile phone transmission / reception unit 16 having a mobile phone radio unit 17, a mobile phone modulation / demodulation unit 18, and a mobile phone field strength determination unit 19, a reception unit 4, a synchronization unit 5, a demodulation unit 6, and an electric field. Broadcast receiving unit 3 having strength determining unit 7, control unit 20 for performing various controls for reproducing audio signals and video signals, display unit 21 for reproducing and displaying video signals, and audio for reproducing audio signals to audio The reproduction unit 22 and the key input unit 23 for inputting operation information to the control unit 20 are provided.

  Next, a schematic operation of the mobile phone 24 shown in FIG. 10 will be described. Communication of the cellular phone 24 is performed by an antenna 15 provided in or on the cellular phone 24, and a cellular phone received wave from a base station (not shown) received by the antenna 15 is transmitted to the cellular phone transmission / reception unit 16. Is input. Further, the mobile phone transmission wave to the base station output from the mobile phone transmission / reception unit 16 is transmitted from the antenna 15.

  Inside the mobile phone transmitting / receiving unit 16, the mobile phone radio unit 17 converts the mobile phone reception wave input from the antenna 15 into a mobile phone reception digital baseband signal to determine the mobile phone modulation / demodulation unit 18 and mobile phone field strength determination. In addition to outputting to the unit 19, the mobile phone transmission digital baseband signal input from the mobile phone modulation / demodulation unit 18 is converted into a mobile phone transmission wave and output to the antenna 15. In addition, the cellular phone modem unit 18 converts the cellular phone received digital baseband signal input from the cellular phone radio unit 17 into an audio signal during voice communication, and converts the digital baseband signal into a data signal during data communication, and the control unit 20. Output to. Further, the cellular phone modulation / demodulation unit 18 converts the audio signal and data signal input from the control unit 20 into a cellular phone transmission digital baseband signal, and outputs it to the cellular phone radio unit 17.

  In addition, the mobile phone field strength determination unit 19 detects the field strength of the mobile phone reception wave and outputs it to the control unit 20. Then, the control unit 20 causes the audio reproduction unit 22 to reproduce the audio signal input from the mobile phone modulation / demodulation unit 16 and outputs the audio signal input from the audio input unit (not shown) to the mobile phone modulation / demodulation unit 18.

  On the other hand, the digital television broadcast wave is received by the antenna 2 provided inside, on the surface, or outside of the mobile phone 24 and input to the broadcast receiving unit 3. Inside the broadcast receiving unit 3, the receiving unit 4 converts the received broadcast wave input from the antenna 2 into a digital baseband signal. Further, the synchronization unit 5 detects a modulation synchronization signal from the received broadcast wave converted into the digital baseband signal and outputs it to the demodulation unit 6 and the control unit 20. The demodulating unit 6 converts the received broadcast wave converted into the digital baseband signal into a video signal and an audio signal with reference to the modulation synchronizing signal input from the synchronizing unit 5 and outputs the video signal and the audio signal to the control unit 20.

  Further, the electric field strength determination unit 7 detects the electric field strength of the received broadcast wave and outputs it to the control unit 20. The control unit 20 causes the display unit 21 to reproduce the video signal input from the demodulation unit 6 and causes the audio reproduction unit 22 to reproduce the audio signal. Further, the control unit 20 displays the digital television broadcast area on the display unit 21 based on the modulation synchronization signal input from the synchronization unit 5, and based on the received electric field strength signal input from the electric field strength determination unit 7. The digital television reception level is displayed on the display unit 21. The display unit 21 is a video display device composed of elements such as liquid crystal and organic EL. The audio reproduction unit 22 is an audio output device configured with elements such as speakers and earphones.

  In the cellular phone 24 configured as described above, an operation at the time of switching between the cellular phone mode and the digital television viewing mode will be described with reference to the flowcharts shown in FIGS. An example of a method for displaying the reception status of digital television broadcast waves and mobile phone reception waves on the display unit 21 will be described with reference to FIGS.

  FIG. 11 is a flowchart showing an operation when switching from the cellular phone mode to the digital television viewing mode in the cellular phone according to the fourth embodiment of the present invention. FIG. 12 is a flowchart showing an operation when switching from the digital television viewing mode to the cellular phone mode in the cellular phone according to Embodiment 4 of the present invention. Furthermore, FIG. 13 is a diagram showing a display example when both the mobile phone and the broadcast wave reception status are good on the display unit 21 of the mobile phone according to Embodiment 4 of the present invention. FIG. 14 is a diagram showing a display example in the display unit 21 of the mobile phone according to Embodiment 4 of the present invention when the mobile phone is out of service area but the reception status of the digital television broadcast wave is good. . Further, FIG. 15 is a diagram showing a display example in the display unit 21 of the mobile phone according to the fourth embodiment of the present invention when the reception status of the mobile phone is good but outside the digital television broadcast service area. It is. FIG. 16 is a diagram showing a display example of the state of step S106 in the flowchart of FIG. 11 on display unit 21 of the mobile phone according to Embodiment 4 of the present invention. Furthermore, FIG. 17 is a diagram showing a display example of the state of step S206 in the flowchart of FIG. 12 on the display unit 21 of the mobile phone according to Embodiment 4 of the present invention.

  First, an example of a method for displaying the reception status of digital television broadcast waves and mobile phone reception waves on the display unit 21 will be described with reference to FIGS. The method of displaying the reception status of the mobile phone reception wave on the display unit 21 is, for example, antenna bar display linked to the reception electric field strength of the reception wave and out-of-range display when out of service area. The method of displaying the reception status of the digital television broadcast wave on the display unit 21 is the same as in the first embodiment described above. For example, the antenna bar display linked to the reception electric field strength of the broadcast wave, By DTV mark display indicating the inside of the digital television broadcast area by detecting the modulation synchronization signal.

  In the fourth embodiment, since the mobile phone transmitting / receiving unit 16 and the broadcast receiving unit 3 can be operated independently, the reception status of the digital television broadcast wave can be grasped even in the mobile phone mode. Even in the digital television viewing mode, the mobile phone reception status can be grasped.

  FIGS. 13 to 15 show display examples of the reception status on the display unit 21, and FIG. 13 is a display example when the reception status of both the mobile phone and the digital television broadcast wave is good. John Broadcast's antenna bar display is displayed side by side. A cellular phone mark is also written on the antenna bar of the cellular phone, and a DTV mark indicating the inside of the broadcast area is also written on the antenna bar display of the digital television. At this time, both antenna bars can be easily distinguished.

  FIG. 14 is a display example when the mobile phone is out of service due to poor reception, but the broadcast wave reception is good, and the antenna bar of the mobile phone is out of service. FIG. 15 shows a display example when the reception status of the mobile phone is good but the reception status of the digital television is bad and the modulation synchronization signal cannot be detected. Only the antenna bar of the mobile phone is displayed.

  Next, the operation when switching from the cellular phone mode to the digital television viewing mode will be described using the flowchart shown in FIG. Here, the mobile phone mode is a mode in which the mobile phone stands by, makes a call, and performs data communication. For the digital television function, only the digital television broadcast area and the antenna bar display are performed in the margin of the display unit 21. ing. The digital television viewing mode is a mode for viewing a digital television broadcast. The mobile phone function is in a standby state, and only the antenna bar is displayed in the margin of the display unit 21.

  First, in the mobile phone mode in which the digital television has only the broadcast area / antenna bar display (step S101), when the user selects switching to the digital television viewing mode by operating the key input unit 23 or the like (step S101). S102), the control unit 20 determines whether or not it is in the digital television broadcast area based on the presence or absence of the detection of the modulation synchronization signal of the broadcast wave (step S103). Here, when the digital television broadcast wave is in the digital television broadcast area (Yes in step S104), the mobile phone shifts to a digital television viewing mode in which only the antenna bar is displayed (step S105).

  On the other hand, when the digital television broadcast wave is outside the digital television broadcast area (No in step S104), for example, a warning outside the digital television broadcast area as shown in FIG. (Step S106) The digital television returns to the mobile phone mode in which only the broadcast area / antenna bar display is performed (step S107).

  Next, the operation when switching from the digital television viewing mode to the cellular phone mode will be described using the flowchart shown in FIG. First, in the digital television viewing mode in which the mobile phone has only the antenna bar display (step S201), when the user selects switching to the mobile phone mode by operating the key input unit 23 or the like (step S202), the control unit 20 determines whether the mobile phone is within the mobile phone range based on the received electric field strength of the mobile phone reception wave (step S203). If the mobile phone is within the mobile phone range (Yes in step S204), the digital television is in the broadcast area. A transition is made to the mobile phone mode with only display and antenna bar display (step S205).

  On the other hand, when the mobile phone is out of the mobile phone range (No in step S204), for example, a warning out of the mobile phone range as shown in FIG. 17 is displayed on the display unit 21, and the digital television viewing mode is terminated. The end selection screen is displayed to ask the user for selection (step S206). Here, the user selects to end the digital television viewing mode by operating the key input unit 23 or the like (step S207), and when the user selects the end of the digital television viewing mode (in step S208). In the case of Yes), the digital television shifts to a mobile phone mode with only broadcast area display / antenna bar display (step S205).

  On the other hand, when the user waits for the mobile phone to return to the mobile phone area and selects the continuation of the digital television viewing mode (No in step S208), the mobile phone uses the digital television viewing mode with only the antenna bar display. (Step S209).

  With the above operation, even when the mobile phone is moving and the user cannot determine whether the current location is within the digital television broadcast service area, the detection information of the modulation synchronization signal is displayed as the broadcast area display. By displaying on the display unit 21, it is possible to notify the user whether or not it is within the service area even if the received electric field strength has decreased to a level at which video cannot be reproduced. Therefore, based on this information, the user can increase the viewing chance by frequently trying to receive broadcasts in the service area.

  Even in the mobile phone mode, it is possible to always grasp the reception status of digital television broadcasting. Furthermore, since the reception status of the mobile phone can always be grasped even in the digital television viewing mode, the convenience can be further improved. In addition, when the user selects mode switching, a warning is displayed when the reception status of the transfer destination mode is bad, so that not only the convenience is further improved, but also the power consumption of the mobile phone can be reduced. .

  In the fourth embodiment, only one display unit 21 is shown. However, two or more display units are provided, and each mobile phone and digital television broadcast reception status can be displayed on each display unit. It is good. In the fourth embodiment, the mobile phone mark is shown together with the antenna bar that displays the electric field strength of the mobile phone. However, any mark or character that can be recognized as a mobile phone may be used for display.

  In the first to fourth embodiments described above, the configuration in which the detection of the modulation synchronization signal of the broadcast wave is displayed by the DTV mark as the broadcast area display of the digital television is shown, but it can be recognized as a digital television. Needless to say, the present invention can be realized by any mark or character.

  The portable digital television broadcast receiver and the mobile phone according to the present invention can be used as a portable terminal that is easy to use and highly versatile because the user can easily know whether or not the user is within the digital television broadcast service area. It can be used effectively.

1 is a block diagram showing a configuration of a portable digital television broadcast receiver according to Embodiment 1 of the present invention. The figure which shows an example of the display state in case the receiving electric field strength is high in the display part of the portable digital television broadcast receiver which concerns on Embodiment 1 of this invention (state 1). The figure which shows an example of the display state in the display part of the portable digital television broadcast receiver which concerns on Embodiment 1 of this invention, when a receiving electric field strength is low, but a modulation | alteration synchronizing signal is receivable (state 2). The figure which shows an example of the display state in the display part of the portable digital television broadcast receiver which concerns on Embodiment 1 of this invention when a receiving electric field strength is low and a modulation | alteration synchronizing signal cannot be received (state 3). The figure which shows the example of a display of each state of the broadcast wave reception condition displayed on the margin of the display part of the portable digital television broadcast receiver which concerns on Embodiment 1 of this invention. Block diagram showing the configuration of a portable digital television broadcast receiver according to Embodiment 2 of the present invention The figure which shows the example of a display of each state of the broadcast wave reception condition displayed on the margin of the display part of the portable digital television broadcast receiver which concerns on Embodiment 2 of this invention. Block diagram showing a configuration of a portable digital television broadcast receiver according to Embodiment 3 of the present invention The figure which shows the example of a display of each state of the broadcast wave reception condition displayed on the margin of the display part 9 of the portable digital television broadcast receiver which concerns on Embodiment 3 of this invention. Block diagram showing a configuration of a mobile phone according to a fourth embodiment of the present invention. The flowchart which shows the operation | movement in the portable telephone which concerns on Embodiment 4 of this invention when switching from a mobile telephone mode to a digital television viewing mode. The flowchart which shows the operation | movement in the portable telephone which concerns on Embodiment 4 of this invention when switching from a digital television viewing mode to a portable telephone mode. The figure which shows the example of a display in case the reception condition of both a mobile telephone and a digital television broadcast wave is favorable in the display part of the mobile telephone which concerns on Embodiment 4 of this invention. The figure which shows the example of a display in the display part of the mobile telephone which concerns on Embodiment 4 of this invention when a mobile telephone is out of range but the reception condition of a digital television broadcast wave is favorable. The figure which shows the example of a display in the display part of the mobile telephone which concerns on Embodiment 4 of this invention when the reception condition of a mobile telephone is favorable, but is outside the service area of a digital television broadcast. The figure which shows the example of a display of the state of step S106 in the flowchart of FIG. 11 in the display part of the mobile telephone which concerns on Embodiment 4 of this invention. The figure which shows the example of a display of the state of step S206 in the flowchart of FIG. 12 in the display part of the mobile telephone which concerns on Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable digital television broadcast receiver 2, 15 Antenna 3, 11, 13 Broadcast receiving part 4 Receiving part 5 Synchronizing part 6 Demodulating part 7 Electric field strength determination part 8, 20 Control part 9, 21 Display part 10, 22 Sound reproduction Unit 12 error rate determination unit 14 level determination unit 16 mobile phone transmission / reception unit 17 mobile phone radio unit 18 mobile phone modulation / demodulation unit 19 mobile phone field strength determination unit 23 key input unit 24 mobile phone

Claims (9)

A portable digital television broadcast receiver that displays the reception status of radio waves,
A broadcast receiver for receiving digital television broadcast waves;
A display unit for displaying a reception level of a digital television broadcast wave received by the broadcast reception unit and displaying a digital television broadcast area;
A portable digital television broadcast receiver comprising: The reception level indicates reception signal quality corresponding to any one or more of reception electric field strength, reception data error rate, or carrier signal to noise level ratio detected by the broadcast reception unit,
The portable digital television broadcast receiver according to claim 1, wherein the display unit displays the reception level when video or audio having a quality of a predetermined level or higher can be demodulated.   The display of the digital television broadcast area corresponds to the presence or absence of detection of a modulation synchronization signal of a digital television broadcast wave received by the broadcast receiving unit. The portable digital television broadcast receiver described.   4. The lowest received electric field strength at which the digital television broadcast area is displayed is set lower than the lowest received electric field strength at which the reception level is displayed. A portable digital television broadcast receiver described in 1. A mobile phone that displays the reception status of radio waves,
A broadcast receiver for receiving digital television broadcast waves;
A display unit for displaying a reception level of a digital television broadcast wave received by the broadcast reception unit and displaying a digital television broadcast area;
A mobile phone comprising:   6. The mobile phone according to claim 5, wherein the display unit displays the reception level and the digital television broadcast area during a mobile phone operation.   The display unit displays a warning to that effect when switching from a mobile phone operation to an operation for receiving a digital television broadcast wave if the digital television broadcast area is not displayed. 6. The mobile phone according to 6.   6. The mobile phone according to claim 5, wherein the display unit displays a reception level during reception of a digital television broadcast wave.   The display unit, when switching from an operation of receiving a digital television broadcast wave to a mobile phone operation, displays a warning to that effect if the displayed reception level is a predetermined value or less. 9. The mobile phone according to 8.

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