JP6257490B2 - Digital broadcast receiver - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus that is mounted on a vehicle or the like and receives digital broadcasts such as video and audio.

  Conventionally, when multiple tuners are provided and the same program is viewed on the front seat side and the rear seat side of the vehicle, diversity reception using the multiple tuners is performed, and different programs are displayed on the front seat side and the rear seat side. There is known a terrestrial digital broadcast receiver that performs an operation of receiving separate programs for a part of a plurality of tuner units and the rest for viewing (for example, see Patent Documents 1-4).

JP 2005-167890 A JP 2006-197168 A JP 2007-166188 A JP 2008-85762 A

  Recent terrestrial digital broadcast receivers usually receive full-segment digital broadcasts, and receive one-segment digital broadcasts when the reception condition of broadcast waves deteriorates. Program viewing can be continued.

  By the way, in the terrestrial digital broadcast receiver disclosed in Patent Documents 1-4, different programs can be viewed on the front seat side and the rear seat side of the vehicle. When a program on the seat side is being received by one-segment digital broadcast reception, when the so-called zapping is performed in which the broadcast station to be received is switched continuously in a short time (for example, at intervals of several seconds) on the rear seat side, When the reception program on the side and the reception program on the rear seat match, diversity reception using all tuners is performed, so the reception status is temporarily improved and the front seat side is fully receivable from receiving one-segment digital broadcasting. There are cases in which switching to segment digital broadcast reception occurs. Such a change in reception method is desirable from the viewpoint of improving image quality, but there is a gap between video and audio reproduced by receiving one-segment digital broadcast and video and audio reproduced by receiving full-segment digital broadcast. Since there is a time lag in the playback content, there is a problem that the content of the program to be played is temporarily discontinuous, preventing smooth viewing. This problem also occurs when the reception program on the front seat side and the reception program on the rear seat side are changed to a mismatch state again (when returning to the one-segment digital broadcast reception).

  The present invention was created in view of the above points, and its purpose is to prevent the program content from becoming temporarily discontinuous when switching the received program in a short time, thereby enabling smooth viewing. An object of the present invention is to provide a digital broadcast receiving apparatus that can be continued.

  In order to solve the above-described problem, the digital broadcast receiving apparatus of the present invention performs full-segment digital broadcast reception for a broadcast program when the reception state of the broadcast wave is good, and the reception state of the broadcast wave is bad. 1 is a digital broadcast receiving apparatus for receiving one-segment digital broadcasting, and performs demodulation processing and video / audio reproduction processing for one program by a plurality of tuner sections and a combined diversity configuration using the plurality of tuner sections. A first demodulation / reproduction mode for obtaining one reproduction output, and performing a demodulation process and a video / audio reproduction process for one program using a part of a plurality of tuner units to obtain a second reproduction output; A third reproduction output is obtained by performing demodulation processing and video / audio reproduction processing on another one program using another part of the plurality of tuner units. Demodulating / reproducing means for selectively performing the two demodulation / reproducing modes, selectively implementing the first and second demodulating / reproducing modes, and each of the first and second demodulating / reproducing modes. And control means for instructing whether to perform full segment digital broadcast reception or one segment digital broadcast reception. The control means is such that the demodulation / reproduction means is operating in the second demodulation / reproduction mode, and the first program is received by one-segment digital broadcast reception using a part of the plurality of tuner units. When the second program is received by one-segment digital broadcast reception or full-segment digital broadcast reception using another part of the tuner unit, the first and second programs are switched by switching the second program When the two match, the change from the second demodulation / reproduction mode to the first demodulation / reproduction mode is limited for a predetermined time.

  In particular, the control means changes from the second demodulation / reproduction mode to the first demodulation / reproduction mode when the state where the first and second programs match is continued until the predetermined time described above elapses. Is instructed to the demodulation / reproduction means.

  Accordingly, when the operation of viewing the first program by receiving the one-segment digital broadcast and the operation of viewing the second program are performed in parallel, the second program is switched in order. Even when the second program matches the first program, the full-segment digital broadcast reception is not switched for a predetermined time, so that the one-segment digital broadcast reception is fully performed while the first program is being viewed. Switching to segment digital broadcast reception can be avoided, the content of the first program can be prevented from being temporarily discontinuous, and smooth viewing can be continued.

  The digital broadcast receiving apparatus of the present invention receives a full-segment digital broadcast when the broadcast wave reception state is good, and receives a one-segment digital broadcast reception when the broadcast wave reception state is bad. A digital broadcast receiving apparatus that performs a demodulation process and a video / audio reproduction process for one program by a plurality of tuner units and a combined diversity configuration using the plurality of tuner units to obtain a first reproduction output. The demodulating / reproducing mode of 1 and a part of the plurality of tuner units are used to perform demodulation processing and video / audio reproduction processing for one program to obtain a second reproduction output, A second demodulation / playback mode in which a third playback output is obtained by performing a demodulation process and a video / audio playback process on another program using a part thereof; Demodulation / reproduction means to be selectively performed, selective implementation of the first and second demodulation / reproduction modes, full-segment digital broadcast reception and one-segment in each of the first and second demodulation / reproduction modes Control means for instructing which of the digital broadcast reception is performed. The control means is such that the demodulation / reproduction means is operating in the second demodulation / reproduction mode, and the first program is received by one-segment digital broadcast reception using a part of the plurality of tuner units. When the second program is received by one-segment digital broadcast reception or full-segment digital broadcast reception using another part of the tuner unit, the first and second programs are switched by switching the second program When the two match, the second demodulation / playback mode is changed to the first demodulation / playback mode, and one-segment digital broadcast reception is maintained as the first program reception method for a predetermined time.

  Thus, when the second program matches the first program, the first demodulation / playback mode is immediately changed to the first demodulation / playback mode, while the first segment by the one-segment digital broadcast reception is performed. Of the first program can be continued, the content of the first program can be prevented from being temporarily discontinuous, and smooth viewing can be continued.

  The digital broadcast receiving apparatus of the present invention receives a full-segment digital broadcast when the broadcast wave reception state is good, and receives a one-segment digital broadcast reception when the broadcast wave reception state is bad. A digital broadcast receiving apparatus that performs a demodulating process and a video / audio reproducing process on one program by a combination diversity configuration using a plurality of tuner units and a plurality of tuner units, and a first reproduction output of one system The first demodulation / reproduction mode for obtaining the image, the demodulation processing and the video / audio reproduction processing for one program using a part of the plurality of tuner units to obtain a second reproduction output of one system, The second recovery unit obtains a third reproduction output by performing demodulation processing and video / audio reproduction processing on another one program using another part of the tuner unit of Demodulation / reproduction means for selectively performing the reproduction mode, selective implementation of the first and second demodulation / reproduction modes, and full segment digital in each of the first and second demodulation / reproduction modes And control means for instructing whether to perform broadcast reception or one-segment digital broadcast reception. The control means is such that the demodulation / reproduction means is operating in the second demodulation / reproduction mode, and the first program is received by one-segment digital broadcast reception using a part of the plurality of tuner units. When the second program is received by one-segment digital broadcast reception or full-segment digital broadcast reception using another part of the tuner unit, the first and second programs are switched by switching the second program When the first demodulator / broadcast mode is switched from the one-segment digital broadcast reception to the full-segment digital broadcast reception according to the reception state when the first program is received in the first demodulation / playback mode. The change from the reproduction mode to the first demodulation / reproduction mode is prohibited.

  Accordingly, when the operation of viewing the first program by receiving the one-segment digital broadcast and the operation of viewing the second program are performed in parallel, the second program is switched in order. Even when the second program matches the first program, the first demodulation / playback mode is changed to the first in the reception state where the one-segment digital broadcast reception is switched to the full-segment digital broadcast reception. Since the change to the demodulation / playback mode is prohibited, it is possible to avoid switching the one-segment digital broadcast reception to the full-segment digital broadcast reception during viewing of the first program, and the content of the first program is It is possible to prevent discontinuity temporarily and to continue smooth viewing.

It is a figure which shows the structure of the terrestrial digital broadcast receiver of one Embodiment. It is explanatory drawing which performs zapping in the rear seat side, viewing a separate program on the front seat side and the rear seat side. It is a figure which shows the operation | movement procedure which restrict | limits the temporary change from the 1 seg reception mode to the full seg reception mode in a 1st Example. It is a figure which shows the operation | movement procedure which restrict | limits the temporary change from the 1 seg receiving mode to the full seg receiving mode in 2nd Example. It is a figure which shows the range of the reception state which prohibits the change of a reception mode. It is a figure which shows the operation | movement procedure which prohibits the temporary change to the full segment reception mode from the one segment reception mode in a 3rd Example.

  Hereinafter, a digital terrestrial broadcast receiver according to an embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a terrestrial digital broadcast receiver according to an embodiment. As shown in FIG. 1, the terrestrial digital broadcast receiver 100 of this embodiment is mounted on a vehicle, and includes four tuner units 10, 12, 14, 16, and OFDM (Orthogonal Frequency Division Multiplex) demodulator units 30, 32. MPEG decoders 40F and 40R, digital-analog converters (D / A) 42F and 42R, speakers 44F and 44R, display processing units 46F and 46R, display devices 48F and 48R, output switching unit 50, operation units 60F and 60R, The controller 70 is configured to be included.

  Each of the tuner units 10, 12, 14, and 16 receives a broadcast wave having a reception frequency corresponding to a designated broadcast station via an antenna. Each of the OFDM demodulation units 30 and 32 performs OFDM demodulation processing on broadcast signals (IF signals) input from a plurality of tuner units, and outputs a TS (transport stream) signal. In the present embodiment, a combined diversity configuration is employed in which broadcast signals input from a plurality of tuner units are used, and the phases of these broadcast signals are adjusted and then combined and received. As the number of tuner units used increases, C / N can be improved.

  In the present embodiment, one OFDM demodulator 30 performs the operation of the two combining divers that combine the two IF signals output from the two tuner units 10 and 12 and perform the OFDM demodulation processing, and the other two The other OFDM demodulator 32 performs the operation of a two-combining diver that combines the two IF signals output from the tuner units 14 and 16 and performs OFDM demodulation processing. When performing the operation of a 4-synthesis diver that combines the four IF signals output from the four tuner units 10 to 16, the output signal of the other OFDM demodulation unit 32 is input to one OFDM demodulation unit 30. The OFDM demodulator 30 performs IF signal synthesis and OFDM demodulation processing.

  One MPEG decoder 40F decodes the received program audio and video MPEG signals included in the TS signal output from one OFDM demodulator 30 and outputs audio data and video data. Actually, the TS signal output from the OFDM demodulator 30 is input to the demultiplexer, and the audio and video MPEG signals corresponding to the program that the user desires to view are separated. Such a program receiving operation itself is the same as the conventional method, and only a schematic configuration is shown in FIG.

  The other MPEG decoder 40R decodes the received program audio and video MPEG signals included in the TS signal output from the other OFDM demodulator 32, and outputs audio data and video data. Actually, the TS signal output from the OFDM demodulator 32 is input to the demultiplexer, and the audio and video MPEG signals corresponding to the program that the user desires to watch are separated. Such a program receiving operation itself is the same as the conventional method, and only a schematic configuration is shown in FIG.

  One digital-analog converter 42F converts the audio data output from the MPEG decoder 40F into an analog audio signal and outputs the analog audio signal from the speaker 44F. The display processing unit 46F converts the video data output from the MPEG decoder 40F into a video signal in a format suitable for display (for example, NTSC format) and displays the video signal on the display device 48F. The speaker 44F and the display device 48F are arranged at a position where the user (passenger) of the front seat can view the program content.

  The other digital-analog converter 42R converts the audio data output from the MPEG decoder 40R into an analog audio signal and outputs the analog audio signal from the speaker 44R. The display processing unit 46R converts the video data output from the MPEG decoder 40R into a video signal in a format suitable for display (for example, NTSC format) and displays the video signal on the display device 48R. The speaker 44 </ b> R and the display device 48 </ b> R are arranged at positions where the program contents can be viewed by the user (passenger) in the rear seat.

  In the present embodiment, the reproduction output (audio data, video data) of the OFDM demodulator 30 obtained by the operation of the 4-synthesis diver can be input to both the front seat side and the rear seat side, An output switching unit 50 is provided for switching the input destination of the reproduction output. The output switching unit 50 inputs the reproduction output of the OFDM demodulating unit 30 to the front seat side digital-analog converter 42F and the display processing unit 46F, and outputs the reproduction output of the OFDM demodulation unit 32 to the rear seat side digital-analog converter. 42R and the display processor 46R are connected to each other, and the OFDM demodulator 30 reproduction output is input to the front seat and rear seat digital-analog converters 42F and 42R and the display processors 46F and 46R. Switch.

  One operation unit 60F is used to give various instructions when operated by a passenger on the front seat side. For example, the operation unit 60F is configured by using various switches provided on the housing of the display device 48F, a touch panel disposed on the display device 48F, and the like, and channel selection (broadcast station switching) and volume setting are performed. Used for etc.

  The other operation unit 60R is for giving various instructions when operated by a passenger on the rear seat side. For example, the operation unit 60R is configured by using various switches provided on the casing of the display device 48R, a touch panel disposed on the display device 48R, and the like, and channel selection (broadcast station switching) and volume setting are performed. Used for etc.

  The control unit 70 controls the entire operation including the program receiving operation of the terrestrial digital broadcast receiver 100. For this purpose, the control unit 70 includes a reception state determination unit 72, a demodulation / playback mode setting unit 74, a reception mode setting unit 76, and a reception frequency switching unit 78.

  In the present embodiment, the reception mode is automatically changed (or manually operated) according to the reception state of the received broadcast wave (broadcast station). As this reception mode, there are a full-segment reception mode for receiving a full-segment digital broadcast and a one-segment reception mode for receiving a one-segment digital broadcast. When the reception state (for example, C / N) of the broadcast wave to be received exceeds the reference value, reception operation in the full segment reception mode is possible, but when the reception state is below the reference value, reception operation in the full segment reception mode is possible. Instead, a reception operation in the one-segment reception mode is performed.

  In the present embodiment, the demodulation / reproduction mode can be changed by changing the combination of the four tuner units 10 to 16. For example, a first demodulating / reproducing mode for reproducing video and audio of one program by performing operation of a four-combining diver using four tuner units 10 to 16 and two combining using two tuner units 10 and 12 The diver is operated to play the video and sound of one program corresponding to the front seat side, and the two synthesizing units 14 and 16 are used to perform the operation of the two-combined diver so that the rear seat side is different from the front seat side. Any one of the second demodulation / playback modes for playing back video and audio of other corresponding programs can be selected in accordance with a user instruction.

  The reproduction output (first reproduction output output from the MPEG decoder 40F) obtained when the first demodulation / reproduction mode is selected can be provided to both the front seat side and the rear seat side. It is also possible to provide only one of them. Further, two reproduction outputs (second reproduction output output from the MPEG decoder 40F and third reproduction output output from the MPEG decoder 40R) obtained when the second demodulation / reproduction mode is selected are the front Provided separately for the seat side and the rear seat side.

  By the way, when the first demodulation / reproduction mode (four synthesis divers) is changed to the second demodulation / reproduction mode (two synthesis divers), the reception state (C / If N) deteriorates and falls below the reference value, the reception mode is switched from the full-segment reception mode to the one-segment reception mode even when reception of the same program is maintained. The same applies to the opposite case. When the second demodulation / reproduction mode (2-composite diver) is changed to the first demodulation / reproduction mode (4-composite diver), the received broadcast wave (broadcast station) If the reception state (C / N) is improved and exceeds the reference value, the reception mode is switched from the one-segment reception mode to the full-segment reception mode even when reception of the same program is maintained.

  The reception state determination unit 72 described above determines the reception state (C / N) of the received broadcast wave (broadcast station). This reception state changes depending on the contents of the demodulation process (2 synthesis divers, 4 synthesis divers).

  The demodulation / reproduction mode setting unit 74 sets the demodulation / reproduction mode automatically or according to a user instruction. For example, when a common program is viewed on the front seat side and the rear seat side, the first demodulation / playback mode is set. In this case, the operation of the four synthesis diver using the four tuner units 10 to 16 is performed, and the first reproduction output output from the MPEG decoder 40F is provided to both the front seat side and the rear seat side. . Further, when the user gives an instruction to view the program separately on the front seat side and the rear seat side, the second demodulation / playback mode is set. In this case, the operation of the two-synthesis diver using the two tuner units 10 and 12 is performed, and the second reproduction output output from the MPEG decoder 40F is provided to the front seat side, and the two tuner units 14 and 14 are provided. 16 is performed, and the third reproduction output output from the MPEG decoder 40R is provided to the rear seat side.

  The reception mode setting unit 76 sets the reception mode according to the reception state (C / N) of the broadcast wave being received. As described above, when the C / N exceeds the reference value, the full segment reception mode is set, and when the C / N is smaller than the reference value, the one segment reception mode is set.

  The reception frequency switching unit 78 instructs each of the tuners 10 to 16 to change the reception frequency in order to switch a channel (broadcast station) that is a reception target in accordance with a user instruction. In the case of the first demodulation / reproduction mode described above, a common reception frequency is set for the four tuners 10 to 16. In the case of the second demodulation / playback mode, the reception frequency of the program (broadcast station) to be viewed on the front seat side is set for the two tuner units 10 and 12, and the two tuner units 14 and 16 are set. On the other hand, the reception frequency of the program (broadcast station) to be viewed on the rear seat side is set. A plurality of broadcast stations to be received are registered in advance for each preset number, and the user (passenger in the front seat and rear seat) specifies the preset number or presses the channel up / down key. The broadcast station to be received can be changed by such a method. The act of frequently switching such broadcast stations, for example, in less than 10 seconds, is widely known as so-called “zapping”.

  The above-described OFDM demodulation units 30 and 32 and MPEG decoders 40F and 40R correspond to demodulation / reproduction means, and the reception state determination unit 72, demodulation / reproduction mode setting unit 74, and reception mode setting unit 76 correspond to control means.

  The terrestrial digital broadcast receiver 100 of the present embodiment has such a configuration. Next, during operation in the second demodulation / playback mode for viewing different programs on the front seat side and the rear seat side, A case where a passenger on the rear seat side performs zapping using the operation unit 60R will be described (FIG. 2).

  In the example shown in FIG. 2, the second demodulation / playback mode is set, the broadcast station B program is viewed in the one-seg reception mode on the front seat side, and the broadcast stations are A, B, C,... Are switched at short time intervals. In such a case, when switching to the broadcast station B on the rear seat side, since the same broadcast station B program is viewed on both the front seat side and the rear seat side, there are no restrictions on the operation. When the demodulating / reproducing mode setting unit 74 changes the mode to the first demodulating / reproducing mode and the C / N of the broadcasting station B is improved by shifting to the operation of the 4-synthetic diver, the receiving mode setting unit 76 performs the full segment receiving mode. May be changed to In the present embodiment, the following operations of the first to third examples are performed as specific examples for limiting such a change in the reception mode.

(First embodiment)
FIG. 3 is a diagram showing an operation procedure for restricting temporary change from the one-segment reception mode to the full-segment reception mode in the first embodiment. When switching between broadcast stations to be received on the rear seat side during operation in the second demodulation / playback mode shown in FIG. 2, the demodulation / playback mode setting unit 74 sets the same broadcast station on the rear seat side and the front seat side. Is determined (step 100). If a different broadcast station is received, a negative determination is made and the process ends.

  If the same broadcast station is received, an affirmative determination is made in the determination in step 100. Next, the reception mode setting unit 76 determines whether or not the front seat side is set to the one-segment reception mode (step 102). In the one-segment reception mode, an affirmative determination is made. Next, the demodulation / playback mode setting unit 74 determines whether or not a predetermined time (for example, 10 seconds) has elapsed since the switching of the broadcasting stations (step 104). If it has not elapsed, a negative determination is made, and the process returns to step 100 and the operations after the reception determination of the same broadcast station are repeated.

  In addition, when 10 seconds have elapsed since the switching of the broadcasting stations, an affirmative determination is made in the determination of step 104. Thereafter, or after the front seat side is in the full segment reception mode and a negative determination is made in the determination in step 102, the demodulation / reproduction mode setting unit 74 performs the first demodulation / reproduction mode (operation of the four-combined diver). (Step 106).

  As described above, in the terrestrial digital broadcast receiver 100 corresponding to the first embodiment, when the broadcast station to be received on the rear seat side is switched during operation in the second demodulation / playback mode shown in FIG. Even if the broadcast station receiving on the rear seat side and the broadcast station receiving on the front seat side match, the first demodulator / playback mode is entered for a predetermined time (10 seconds). Since the mode is not switched to the reception mode, it is possible to prevent the content of the broadcast station program being viewed on the front seat side from being temporarily discontinuous, and to continue smooth viewing.

(Second embodiment)
FIG. 4 is a diagram illustrating an operation procedure for restricting temporary change from the one-segment reception mode to the full-segment reception mode in the second embodiment. When switching between broadcast stations to be received on the rear seat side during operation in the second demodulation / playback mode shown in FIG. 2, the demodulation / playback mode setting unit 74 sets the same broadcast station on the rear seat side and the front seat side. Is determined (step 100). If a different broadcast station is received, a negative determination is made and the process ends.

  If the same broadcast station is received, an affirmative determination is made in the determination in step 100. Next, the reception mode setting unit 76 determines whether or not the front seat side is set to the one-segment reception mode (step 102). If the full segment reception mode is set, a negative determination is made. Next, the demodulation / reproduction mode setting unit 74 changes to the first demodulation / reproduction mode (operation of the four-combining diver) (step 106).

  If the front seat side is in the one-segment reception mode, an affirmative determination is made in the determination in step 102. Next, the demodulation / reproduction mode setting unit 74 changes to the first demodulation / reproduction mode (operation of the four-combining diver), and the reception mode setting unit 76 fixes the reception mode (one-segment reception mode) so far (step). 200). In this state, the reception operation is performed in the one-segment reception mode regardless of the reception state (C / N), and the obtained reproduction output is taken out to view the program contents on the front seat side and the rear seat side. Is done.

  Next, the demodulation / playback mode setting unit 74 determines whether or not a predetermined time (for example, 10 seconds) has elapsed since the switching of the broadcasting stations (step 202). If not, a negative determination is made and this determination is repeated.

  If 10 seconds have elapsed since the switching of the broadcasting stations, an affirmative determination is made in the determination of step 202. Next, the reception mode setting unit 76 releases the fixed reception mode (one-segment reception mode) (step 204).

  As described above, in the terrestrial digital broadcast receiver 100 corresponding to the second embodiment, when the broadcast station to be received on the rear seat side is switched during operation in the second demodulation / playback mode shown in FIG. Even if the broadcast station receiving on the rear seat side matches the broadcast station receiving on the front seat side, the mode shifts to the first demodulation / playback mode for a predetermined time (10 seconds). Since the reception mode (one-segment reception mode) up to that point is fixed while the operation of the combining diver is started, the front seat side does not switch to the full-segment reception mode. For this reason, it is possible to prevent the content of the broadcast station program being viewed on the front seat side from being temporarily discontinuous, and to continue smooth viewing.

(Third embodiment)
In general, when the reception state (C / N) of the receiving broadcast station is very good, even if switching between the first demodulation / reproduction mode and the second demodulation / reproduction mode occurs, the full segment reception mode The reception operation at is maintained. Also, if the reception state (C / N) of the receiving broadcast station is very bad, even if switching between the first demodulation / reproduction mode and the second demodulation / reproduction mode occurs, the one-segment reception mode The reception operation at is maintained. When switching between the first demodulation / reproduction mode and the second demodulation / reproduction mode occurs in the intermediate reception state (C / N), the one-segment reception mode is changed to the full-segment reception mode or vice versa. In addition, the full-segment reception mode is changed to the one-segment reception mode. Therefore, it is only necessary to prohibit the change of the reception mode in the intermediate reception state (C / N).

  FIG. 5 is a diagram illustrating a range of reception states in which the change of the reception mode is prohibited. In FIG. 5, the vertical axis represents the broadcast wave reception state (C / N), and the horizontal axis represents time t. Further, a is a reference value for switching between the full-segment reception mode and the one-segment reception mode when the diversity configuration is not changed. In addition, b is a lower limit value in which the one-segment reception mode is maintained when the 2-synthesis diver is changed to the 4-synthesis diver. When the C / N of the broadcast wave is between the lower limit b and the reference value a, the C / N of the broadcast wave is improved when the 2 composite diver is switched to the 4 composite diver. The previous one-segment reception mode is changed to the full-segment reception mode. In the third embodiment, when the area between the lower limit value b and the reference value a is set as a prohibited area, and the C / N of the broadcast wave is included in the prohibited area, the first demodulation / reproduction mode is changed to the first demodulation / reproduction mode. Switching to playback mode is prohibited.

  FIG. 6 is a diagram illustrating an operation procedure for prohibiting temporary change from the one-segment reception mode to the full-segment reception mode in the third embodiment. When switching between broadcast stations to be received on the rear seat side during operation in the second demodulation / playback mode shown in FIG. 2, the demodulation / playback mode setting unit 74 sets the same broadcast station on the rear seat side and the front seat side. Is determined (step 100). If a different broadcast station is received, a negative determination is made and the process ends.

  If the same broadcast station is received, an affirmative determination is made in the determination in step 100. Next, the reception mode setting unit 76 determines whether or not the front seat side is set to the one-segment reception mode (step 102). In the one-segment reception mode, an affirmative determination is made. Next, the demodulation / playback mode setting unit 74 determines whether or not the reception state (C / N) of the broadcast station is included in the prohibited area shown in FIG. 5 (step 300). If included, an affirmative determination is made, and the process returns to step 100 to repeat the operations after the reception determination of the same broadcast station.

  On the other hand, if the reception state (C / N) of the broadcasting station is not included in the prohibited area shown in FIG. Thereafter, or after the front seat side is in the full segment reception mode and a negative determination is made in the determination in step 102, the demodulation / reproduction mode setting unit 74 performs the first demodulation / reproduction mode (operation of the four-combined diver). (Step 106).

  As described above, in the terrestrial digital broadcast receiver 100 corresponding to the third embodiment, when the broadcast station to be received on the rear seat side is switched during operation in the second demodulation / reproduction mode shown in FIG. Even if the broadcast station receiving on the rear seat side matches the broadcast station receiving on the front seat side, the reception state (C / N) of the broadcast station is within a predetermined range (prohibited area shown in FIG. 5). If included, the content of the broadcast station program being viewed on the front seat side is temporarily discontinuous because the mode does not change to the first demodulation / playback mode and the full segment reception mode. Can be prevented and smooth viewing can be continued.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the two tuner units 14 and 16 are used corresponding to the rear seat side, and the two tuner units 10 and 12 are used corresponding to the front seat side, but the number of these tuner units ( The combination) may be other than these. For example, one tuner unit 14 may be used on the rear seat side, and one tuner unit 10 may be used on the front seat side.

  As described above, according to the present invention, the operation of viewing the first program by the one-segment digital broadcast reception and the operation of viewing the second program are performed in parallel. Even if the second program matches the first program when switching between, the one-segment digital broadcast reception is prevented from being switched to the full-segment digital broadcast reception while viewing the first program. Therefore, the content of the first program can be prevented from being temporarily discontinuous, and smooth viewing can be continued.

100 terrestrial digital broadcast receiver 10, 12, 14, 16 tuner unit 30, 32 OFDM demodulator unit 40F, 40R MPEG decoder 42F, 42R digital-analog converter (D / A)
44F, 44R Speaker 46F, 46R Display processing unit 48F, 48R Display device 60 Output switching unit 60F, 60R Operation unit 70 Control unit 72 Reception state determination unit 74 Demodulation / playback mode setting unit 76 Reception mode setting unit 78 Reception frequency switching unit

Claims (4)

A digital broadcast receiving apparatus that receives a full segment digital broadcast when a broadcast wave reception state is good and a one-segment digital broadcast reception when a broadcast wave reception state is bad for a broadcast program,
Multiple tuners,
A first demodulation / reproduction mode for obtaining a first reproduction output by performing demodulation processing and video / audio reproduction processing for one program by a combining diversity configuration using the plurality of tuner units; and A part is used to perform a demodulation process on one program and a video / audio reproduction process to obtain a second reproduction output, and another part of the plurality of tuner units is used to demodulate another program. Demodulating / reproducing means for selectively performing a second demodulation / reproducing mode for obtaining a third reproduction output by performing processing and video / audio reproducing processing;
Instructing selectively performing the first and second demodulation / reproduction modes and whether to perform full-segment digital broadcast reception or one-segment digital broadcast reception in each of the first and second demodulation / reproduction modes Control means to
And the control means is configured to receive the first program by receiving the one-segment digital broadcast using a part of the plurality of tuner units when the demodulation / playback means is operating in the second demodulation / playback mode. And the second program is switched when the second program is received by receiving one-segment digital broadcast or full-segment digital broadcast using another part of the plurality of tuner units. Thus, when the first and second programs coincide with each other, the change from the second demodulation / reproduction mode to the first demodulation / reproduction mode is restricted for a predetermined time. apparatus. In claim 1,
When the state where the first and second programs match is continued until the predetermined time elapses, the control means switches from the second demodulation / reproduction mode to the first demodulation / reproduction mode. A digital broadcast receiver characterized in that an instruction to change is given to the demodulation / playback means. A digital broadcast receiving apparatus that receives a full segment digital broadcast when a broadcast wave reception state is good and a one-segment digital broadcast reception when a broadcast wave reception state is bad for a broadcast program,
Multiple tuners,
A first demodulation / reproduction mode for obtaining a first reproduction output by performing demodulation processing and video / audio reproduction processing for one program by a combining diversity configuration using the plurality of tuner units; and A part is used to perform a demodulation process on one program and a video / audio reproduction process to obtain a second reproduction output, and another part of the plurality of tuner units is used to demodulate another program. Demodulating / reproducing means for selectively performing a second demodulation / reproducing mode for obtaining a third reproduction output by performing processing and video / audio reproducing processing;
Instructing selectively performing the first and second demodulation / reproduction modes and whether to perform full-segment digital broadcast reception or one-segment digital broadcast reception in each of the first and second demodulation / reproduction modes Control means to
And the control means is configured to receive the first program by receiving the one-segment digital broadcast using a part of the plurality of tuner units when the demodulation / playback means is operating in the second demodulation / playback mode. And the second program is switched when the second program is received by receiving one-segment digital broadcast or full-segment digital broadcast using another part of the plurality of tuner units. Thus, when the first and second programs match, the second demodulation / playback mode is changed to the first demodulation / playback mode, and the reception method of the first program is set for a predetermined time. A digital broadcast receiver characterized by maintaining one-segment digital broadcast reception. A digital broadcast receiving apparatus that receives a full segment digital broadcast when a broadcast wave reception state is good and a one-segment digital broadcast reception when a broadcast wave reception state is bad for a broadcast program,
Multiple tuners,
A first demodulation / reproduction mode for obtaining a first reproduction output of one system by performing a demodulation process and a video / audio reproduction process for one program by a combining diversity configuration using the plurality of tuner units; A part of the tuner unit is used to perform demodulation processing and video / audio reproduction processing on one program to obtain a second reproduction output of one system, and another part of the plurality of tuner units is used to Demodulating / reproducing means for selectively performing a second demodulating / reproducing mode for obtaining a third reproduction output by performing a demodulating process and a video / audio reproducing process for one program of
Instructing selectively performing the first and second demodulation / reproduction modes and whether to perform full-segment digital broadcast reception or one-segment digital broadcast reception in each of the first and second demodulation / reproduction modes Control means to
And the control means is configured to receive the first program by receiving the one-segment digital broadcast using a part of the plurality of tuner units when the demodulation / playback means is operating in the second demodulation / playback mode. And the second program is switched when the second program is received by receiving one-segment digital broadcast or full-segment digital broadcast using another part of the plurality of tuner units. Thus, when the first program and the second program match, the one-segment digital broadcast reception is changed to the full segment digital depending on the reception state when the first program is received in the first demodulation / playback mode. When switching to broadcast reception, a change from the second demodulation / reproduction mode to the first demodulation / reproduction mode is prohibited. Le broadcast receiver.

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