JP2009147530A - Terrestrial digital broadcast receiver and its reception method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terrestrial digital broadcast receiver and its reception method, by which a one-segment program can be viewed continuously from the beginning, and although a full-segment program cannot be viewed continuously but can be viewed in proper picture quality, even if switching between a full-segment program output and a one-segment program output is performed. <P>SOLUTION: When a received and selected weak hierarchy service program and a received selected strong hierarchy service program are the same, the video image/the sound of a program not yet been outputted until then are outputted on real-time at reception timing if the output switching of the programs is instructed. When they are different from each other, the video image/the sound of the strong hierarchy service program are stored. If output switching from the weak hierarchy service program to the strong hierarchy service program is instructed, it is controlled so as to continuously output the video image/the sound of the strong hierarchy service program from the beginning by using a storing signal. If output switching from the strong hierarchy service program to the weak hierarchy service program is instructed, the video image/the sound of the weak hierarchy service program are outputted on real time at the reception timing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a terrestrial digital broadcast receiver and a reception method thereof, and more particularly, to a terrestrial digital broadcast receiver for receiving a terrestrial digital broadcast in which a weak hierarchical service program and a strong hierarchical service program exist in the same channel and the reception thereof. Regarding the method.

  In Japan, terrestrial television broadcasting is being digitized. In 2011, digital terrestrial broadcasting will be implemented nationwide, and analog waves will be stopped. In such terrestrial digital broadcasting, as shown in FIG. 9, an OFDM (Orthogonal Frequency Division Multiplexing) system that obtains high frequency utilization efficiency and transmission quality is adopted as a transmission system, and a bandwidth of 6 MHz is used. Divide one broadcast channel (physical channel) into 14 segments, of which 13 segments, excluding guard bands, are divided into groups of multiple segment groups (hierarchies). Different programs (programs) of different systems can be broadcast simultaneously.

  That is, in terrestrial digital broadcasting, one channel is divided into 13 segments for broadcasting, and the 13 segments are composed of a maximum of 3 layers. The hierarchies are called strong hierarchies, middle hierarchies, and weak hierarchies depending on the receivable C / N ratio (Carrier to Noise ratio). The strong layer is a layer that can be received at the lowest C / N ratio, the middle layer is the layer that can be received at an intermediate C / N ratio, and the weak layer is the layer that can be received at the best C / N ratio. Actually, in the terrestrial digital broadcasting, the middle layer is not scheduled to be operated, so only the strong layer and the weak layer are broadcast. 12 out of 13 segments are used to broadcast programs that can be received at a high C / N ratio in the weak hierarchy (full segment program), and one segment (white segment in Fig. 9) is received at a low C / N ratio in the strong hierarchy. Used to broadcast possible programs (one-segment programs).

  In terrestrial digital broadcasting, different modulation schemes can be set for each segment, which makes it possible to transmit a plurality of programs with different bit rates and error tolerances within the same band. Therefore, it is possible to simultaneously provide a weak layer service (full-segment service) for fixed receivers and a strong layer service (one-segment service) for mobile receivers and portable receivers. For example, in order to achieve high-definition image quality (HDTV: High Definition TV) reception in home-use television receivers, etc., 12 segments out of 13 segments are used for high-definition image transmission, and data is transmitted at high speed. It uses a modulation method such as 64-value QAM. On the other hand, for receivers that can only be equipped with small antennas such as mobile receivers and portable receivers, broadcast with simple image quality to achieve stable reception, using 1 segment out of 13 segments, A modulation method such as QPSK is adopted. Here, in order to receive a signal transmitted with 64-value QAM using 12 segments, a C / N ratio reception environment with a weak hierarchy is required. However, a signal transmitted with QPSK using 1 segment is required. In order to receive, a high C / N ratio reception environment is not required, and reception is possible even in a low C / N ratio reception environment of a strong hierarchy.

  Moreover, in terrestrial digital broadcasting, instead of broadcasting with high definition image quality in one radio wave band (channel), three broadcasts with standard image quality (for example, SDTV: Standard Definition TV) can be performed. Broadcast stations can switch between one high-definition image broadcast and three standard-definition program broadcasts (multi-organization) depending on the time of day, which allows users to broadcast a predetermined full-segment program and a one-segment program. You can select and receive. Note that MPEG-2 TS (Transport Stream) is adopted as a protocol for performing streaming broadcasting, and it is easy to transmit encoded image data (bit stream data) after information source encoding on the transmission side. It is packetized into TS packets of fixed length (188 bytes including header), one transport stream in which those TS packets are arranged is generated and broadcast by performing the above-described OFDM modulation and the like. Furthermore, HDTV or SDTV TS packets and one-segment broadcasting TS packets are multiplexed into a single transport stream, thereby enabling multiplex broadcasting of the plurality of programs (programs).

  In addition to video and audio information, program arrangement information SI (Service Information) is defined in the terrestrial digital broadcast signal. The SI includes various tables such as NIT (Network Information Table), BIT (Broadcaster Information Table), SDT (Service Description Table), EIT (Event Information Table), and TOT (Time Offset Table). The NIT describes information related to a transmission network such as a channel number, a modulation method, and a guard interval. In the BIT, SI transmission information of the broadcasting station such as broadcasting station identification information and series information, a retransmission period of each SI table, an SI posting period, a logo information transmission method, and the like are described. The SDT describes the name of the channel, the type of EIT transmitted in each channel, and digital copy control information. In an EIT (Event Information Table), information related to a program, such as a program name, a program broadcast start time, a program broadcast time, and program contents, is described. EPG (Electronic Program Guide) is mainly created using this information. The current date, time, and daylight saving time information are written in the TOT.

  In the EIT (Event Information Table), as shown in Fig. 10, H-EIT for displaying programs on weak receivers (full-segment receivers) and program displays on intermediate receivers (mobile receivers) M-EIT for the purpose of TV, and L-EIT for the purpose of program display with a strong hierarchical receiver (one-segment receiver). The H-EIT provides at least two pieces of program information, that is, information on a program that is currently being broadcast and information on a program that is broadcast next, and program information for a maximum of eight days is provided. M-EIT or L-EIT provides at least two pieces of program information, that is, information on a program that is currently being broadcast and information on a program that is broadcast next, and program information on a maximum of ten programs is provided.

  In a terrestrial digital broadcast receiver that receives a terrestrial digital broadcast in which a weak hierarchy service program and a strong hierarchy service program exist in the same channel, as shown in FIG. 11, the reception state deteriorates during reception of a weak hierarchy program. When the reception status is improved during reception of the strong layer program, the reception is switched to the original program of the weak layer. This is because broadcast signals cannot be received correctly if the reception state deteriorates during reception of a program in a weak hierarchy. In addition, if the reception state is improved during reception of a high-level program, a low-level program can be received and high-quality images and music can be provided in a large size.

By the way, after 2008, the same program is not necessarily broadcasted on the weak layer (full segment) and the strong layer (one segment). In such a case, if a full-seg video is simply presented when the reception status is good and a one-segment video is presented when the reception status is poor, the video of programs with different contents are alternately displayed, resulting in a user Will both view the contents of both of them in a small amount, and the program contents may not be recognized. FIG. 12 is an explanatory diagram for explaining such a situation. When different programs are broadcasted in full segment and one segment, (1) the reception state deteriorates at time t1, and full segment → one segment switching is performed, and (2) time At t2, the reception state is improved and one-segment to full-segment switching is performed. Similarly, (3) full-segment to one-segment switching is performed at time t3, and (4) one-segment to full-segment switching is performed at t4. When such switching is performed, the one-segment program is viewed from the middle at the switching of time t1, and the full-segment program is viewed piece by piece.
Therefore, there is a conventional technique in which the program can be viewed from the top of the program at the time of switching, or can be viewed continuously instead of being framed. FIG. 13 shows a first conventional technique for chasing and reproducing a full-seg program that a user is viewing (Patent Document 1). That is, in the state of watching a full segment program, when full segment → one segment switching occurs at time t1, the switched full segment program is saved, and when one segment → full segment switching occurs at time t2, it is stored. Play a full segment program. By doing in this way, even if there is a channel change, a full segment program can be viewed continuously.

FIG. 14 shows a second conventional technique in which a full-seg program being viewed by a user is chased and reproduced and a one-seg program is viewed from the beginning (Patent Document 2). That is, in the state where the full-seg program is viewed from the beginning while saving the one-segment program, when the full-segment to one-segment switching occurs at time t1, the full-segment program after switching is saved and the stored one-segment program is started When one seg → full seg switching occurs at time t2, the stored full seg program is reproduced. By doing in this way, even if there is a channel change, a full segment program can be viewed continuously, and a one segment program can be viewed from the beginning.
JP 2002-152652 A JP 2007-208875 A

In the first prior art, when switching from full segment to one segment, the one segment program cannot be received from the beginning. Also, when full-segment → one-segment switching and one-segment → full-segment switching are performed automatically based on the reception quality, full-segment programs cannot be received with high quality without noise during one-segment reception, so after one-segment → full-segment switching There is a problem that even if the stored full segment program is reproduced, an image that can be enjoyed cannot be output, and the accumulation of the full segment program is wasted.
In the second prior art, when 1Seg is continuing simulcast (when the full segment program and the 1Seg program are the same), the user views the same program as the full segment from the beginning when switching from full segment to one segment. In addition, when full-segment → one-segment switching and one-segment → full-segment switching are performed automatically depending on the reception quality, full-segment programs cannot be received with high quality without noise during one-segment reception, and are therefore stored after switching from one-segment to full-segment. There is a problem that even if a full-seg program is played, video that can be enjoyed cannot be output, and accumulation of the full-seg program is wasted.
From the above, when the full segment program and the one segment program are the same, the object of the present invention is to enable continuous viewing of the program even if switching from full segment to one segment or vice versa, and not to view the same program from the beginning. It is.
An object of the present invention is that when a full-segment program and a one-segment program are different, even if the full-segment → one-segment switching is automatically performed based on the reception quality, the one-segment program can be continuously viewed from the beginning and automatically Even if full segment switching is performed, it is possible to view a full segment program with good image quality, although the full segment program cannot be viewed continuously.
The object of the present invention is to enable continuous viewing of a full-seg program from the beginning even if the full-seg program and the one-seg program are different, even if the one-segment to full-seg switching is performed manually, and automatically based on the received quality. Even if switching is performed, a full segment program cannot be viewed continuously, but a full segment program with good image quality can be viewed.

The reception method of a terrestrial digital broadcast receiver The present invention is a reception method of a terrestrial digital broadcast receiver that receives a terrestrial digital broadcast in which a weak hierarchical service program and a strong hierarchical service program exist in the same channel.
The first receiving method is a step of checking whether the received weak hierarchical service program and the strong hierarchical service program are the same. If they are the same, the output switching between the weak hierarchical service program and the strong hierarchical service program is instructed. A step of outputting the video and audio signal of the program that was not being output at the reception timing instead of the video and audio signal of the program that was being output until then, if not, the video of the strong hierarchical service program A step of storing a signal and an audio signal; if an output switching from a weak hierarchical service program to a strong hierarchical service program is instructed, the video signal and the audio signal of the strong hierarchical service program are continuous from the beginning using the stored signal. If the output switching from the strong hierarchy service program to the weak hierarchy service program is instructed, the video of the weak hierarchy service program is displayed. A step of outputting an image and a sound signal at a reception timing;
The second receiving method of the present invention includes the step of checking whether the received weak hierarchical service program and the strong hierarchical service program are the same, the weak hierarchical service program and the strong hierarchical service program are the same, and the weak hierarchical service program is the same If the output switching of the strong hierarchy service program is instructed, the video and audio signal of the program that has not been output is output at the reception timing instead of the video and audio signal of the program that has been output until then. Step, if the weak hierarchical service program is different from the strong hierarchical service program and output switching between the weak hierarchical service program and the strong hierarchical service program is automatically instructed based on the reception quality, the video signal only for the strong hierarchical service program And switching control so that the audio signal is continuously output from the beginning, the weak hierarchical service program is different from the strong hierarchical service program, When the output switching between the hierarchical service program and the strong hierarchical service program is manually instructed, there is a step of controlling so that the video signal and audio signal of each program are continuously output from the beginning.
In the second receiving method, if the weak hierarchical service program and the strong hierarchical service program are different from each other, the video signal and the audio signal of the program based on the weak hierarchical service and the program based on the strong hierarchical service are stored; When switching is automatically instructed based on the reception quality, the stored signal is used to control the video signal and audio signal of the strong hierarchical service program to be output continuously from the beginning, and the weak hierarchical service program is controlled. The video signal and the audio signal are controlled so as to be output at the reception timing. When the output switching of the program is instructed manually, the video and audio of each program are output continuously from the beginning using the stored signal. Control step.

-Terrestrial digital broadcast receiver TECHNICAL FIELD This invention is a terrestrial digital broadcast receiver which receives the terrestrial digital broadcast in which the weak hierarchy service program and the strong hierarchy service program exist in the same channel.
The first terrestrial digital broadcast receiver includes a program selection unit that selects a weak hierarchy service program to be received, means for checking whether the received weak hierarchy service program and the strong hierarchy service program are the same, the weak hierarchy service program, A receiving unit that receives a broadcast signal including a strong hierarchical service program, a storage unit that stores a video signal and an audio signal of the strong hierarchical service program, a switching instruction unit that instructs output switching between the weak hierarchical service program and the strong hierarchical service program, and reception If the selected weak hierarchical service program and the strong hierarchical service program are the same, when the output switching between the weak hierarchical service program and the strong hierarchical service program is instructed, the video and audio signals of the program that has been output up to that point are displayed. Instead, the video and audio signals of the program that was not being output until now are output at the reception timing. If the output switching to the video program is instructed, the video signal and the audio signal of the strong hierarchical service program are continuously output from the beginning using the stored signal stored in the storage unit. When an output switching from the hierarchical service program to the weak hierarchical service program is instructed, the switching control unit controls to output the video and audio signal of the weak hierarchical service program at the reception timing.
The second terrestrial digital broadcast receiver includes a reception quality detection unit that detects reception quality of a weak hierarchical service program, a program selection unit that selects a weak hierarchical service program to be received, and the weak hierarchical service program and strong hierarchical service that are selected for reception. Means for checking whether the programs are the same, a receiving unit for receiving a broadcast signal including the weak layer service program and the strong layer service program, and automatically switching output between the weak layer service program and the strong layer service program based on the reception quality A switching instruction unit for instructing, a switching instruction unit for manually instructing output switching between the weak layer service program and the strong layer service program, and the weak layer service program and the strong layer service program are the same, and the weak layer service program and the strong layer service program are the same If the program output switching is instructed, the video signal and audio signal of the program that has been output up to that point will be replaced with the program that has not been output until then. Video signals and audio signals are output at the reception timing, and the weak layer service program and the strong layer service program are different, and output switching between the weak layer service program and the strong layer service program is automatically instructed based on the reception quality. For example, the video signal and the audio signal of the strong hierarchical service program are controlled to be output continuously from the beginning, and the video signal and the audio signal of the weak hierarchical service program are controlled to be output at the reception timing. If the weak hierarchical service program and the strong hierarchical service program are different and the output switching between the weak hierarchical service program and the strong hierarchical service program is manually instructed, the video signal and audio signal of each program are output continuously from the beginning. A switching control unit that performs control as described above.
The second terrestrial digital broadcast receiver further includes a storage unit for storing video signals and audio signals of the weak layer service program and the strong layer service program if the weak layer service program and the strong layer service program are different. The switching control unit outputs the video signal and the audio signal continuously from the beginning only for the strong hierarchical service program using the stored signal when the output switching of the program is automatically instructed based on the reception quality. When the output switching of the program is manually instructed, the video and audio of each program are continuously output from the beginning using the stored signal.

According to the present invention, if the weak hierarchy service program and the strong hierarchy service program are the same, and the output switching between the weak hierarchy service program and the strong hierarchy service program is instructed, the video and audio of the program that has been output until then. Instead of signals, video and audio signals of programs that were not being output until now are output in real time at the reception timing, so if the full segment program and the one segment program are the same, full segment → one segment or vice versa is switched. However, it is possible to watch the program continuously and not to watch the same program from the beginning.
According to the present invention, even if the full-segment program and the one-segment program are different, the one-segment program can be continuously viewed from the beginning regardless of whether the switching is performed manually or automatically. Cannot be viewed continuously, but a full segment program with good image quality can be viewed.
Further, according to the present invention, even when the full-segment program and the one-segment program are different, if the switching is performed manually, the full-segment program can be continuously viewed from the beginning, and the switching is automatically performed. In this case, the full segment program cannot be viewed continuously, but the full segment program with good image quality can be viewed.

(A) Overview of control of the present invention In the present invention, the receiver acquires EIT (H-EIT and L-EIT) of both full-segment and one-segment after channel selection, and checks whether the program contents (event_id) are the same. .
(A) When the program contents are the same If the program contents are the same, as shown in FIG. 1, when switching from Full Seg to One Seg or Switching from One Seg to Full Seg, the video and audio of the full seg or one seg program that was being output until then The output of the signal is stopped, and the video and audio signals of the one-segment or full-segment program that has not been output until then are output in real time at the reception timing. In the figure, the white frame portion indicates that reception is being output, and the shadow frame portion indicates that reception is not being output.

(B) When the program contents are different (first switching control)
As shown in FIG. 2, the first switching control with different program contents automatically stores a one-segment TS packet (Transport Stream Packet) in a hard disk HDD or the like from the beginning in parallel with the reception output of the full-segment program. Since the transmission capacity of 1Seg is about 430kbps, when it accumulates for 1 hour, it needs about (430k / 8bit) * 60 * 60 = 193.5Mbyte. In the full segment, the white frame portion indicates that reception is being performed, and the shadow frame portion indicates that reception is not being output.
In such a state, the reception situation deteriorates (reception quality deterioration), and when switching from full segment to one segment automatically at time t1, the one segment TS stored in the HDD is read and output from the beginning of the one segment program. As a result, the one-segment program can be viewed from the beginning. That is, the chasing playback can be started from the beginning of the one-segment program using the accumulated one-segment TS while continuing the accumulation of the one-segment TS.
On the other hand, if the reception state improves at time t2 after switching to 1Seg, and automatically switches from 1Seg to Full Seg, playback of 1Seg TS is paused and storage continues, and video and audio of Full Seg programs The signal is output in real time at the reception timing. Thereby, although a full segment program cannot be viewed continuously, a full segment program with good image quality can be viewed.
Then, when the reception situation deteriorates again at time t3 and the full segment is automatically switched to one segment, the one segment TS stored in the HDD is read, and playback is resumed from the playback stop position of the one segment program and output. Thereby, the one-segment program can be viewed continuously.
In addition, although the case where it switches automatically was demonstrated above, when switching manually, it controls similarly.

(C) When program contents are different (second switching method)
In the state where the reception mode of 1Seg and Full Seg is manually switched, there is a high possibility that both Full Seg and 1Seg can be received well. For this reason, in the second switching method, at the time of manual switching, control is performed so that both the one-segment program and the full-segment program can be reproduced continuously (chased reproduction) from the beginning. On the other hand, when automatic switching is performed based on the reception quality, control is performed so that only the one-segment program is chased and reproduced as in (b), and the full-segment program is output in real time as it is at the reception timing.
That is, when the program contents are different, the second switching method stores both one-segment and full-segment TS packets (Transport Stream Packets) in the hard disk HDD or the like from the beginning as shown in FIG.
(c-1) Manual switching When a full segment program is being received and output while being stored, when manually switching from full segment to one segment at time t1, the one segment TS stored in the HDD is read and output from the beginning of the one segment program. And continue accumulating. As a result, the one-segment program can be viewed from the beginning. On the other hand, when switching from one seg to full seg manually again at time t2 after switching to one seg, the reading of the one seg TS is stopped and the accumulation is continued, and the full seg TS stored in the HDD is read and the full seg program is read. The reproduction is resumed from the reproduction stop position and the accumulation is continued. Thereby, a full segment program can be viewed continuously.
When switching from full seg to one seg manually at time t3 again, the one seg TS stored in the HDD is read and playback is resumed from the playback stop position of the one seg program and the storage is continued. Thereby, the one-segment program can be viewed continuously.

(c-2) Automatic switching When a full segment program is being received and output while accumulating (see Fig. 3 (B)), the reception status deteriorates (deterioration of reception quality), and automatically from full segment to one segment at time t1 When switching to, the 1Seg TS stored in the HDD is read and output from the beginning of the 1Seg program, and the storage continues. As a result, the one-segment program can be viewed from the beginning.
On the other hand, after switching to 1Seg, when the reception state becomes good at time t2 and switching from 1Seg to Full Seg automatically, the playback of 1Seg TS is paused and the accumulation is continued. Audio signals are output in real time as they are received. Thereby, although a full segment program cannot be viewed continuously, a full segment program with good image quality can be viewed. Next, when the reception situation deteriorates again at time t3 and the full segment is automatically switched to one segment, the one segment TS stored in the HDD is read and playback is resumed from the playback stop position of the one segment program. Thereby, the one-segment program can be viewed continuously.

(B) Terrestrial Digital Broadcasting Receiver FIG. 4 is a configuration diagram of the terrestrial digital broadcasting receiver of the present invention, which has a diversity configuration. The first antenna 1 and the second antenna 2 having different directivities are shown in FIG. Receive radio waves from terrestrial digital broadcasting. The first tuner 3 is connected to the first antenna 1 and selectively receives a signal having a reception frequency matching the channel selected by the user from the radio wave of the terrestrial digital broadcast received by the first antenna 1. The second tuner 4 is connected to the second antenna 2 and outputs a signal having a reception frequency that matches the channel selected by the user from the terrestrial digital broadcast radio wave received by the second antenna 2. The signal is selectively extracted and output.
The first OFDM demodulator 5 performs OFDM demodulation on the signal received by the first tuner 3 and outputs a transport stream TS (Transport Stream). The second OFDM demodulator 6 performs OFDM demodulation on the signal received by the second tuner 4 and outputs a TS. Diversity combining section 7 combines phase shifter 7a that controls the phase of TS input from first OFDM demodulation section 5, and TS that is controlled from the phase and TS input from second OFDM demodulation section 6. And a synthesizer 7b.
As described above, the first antenna 1, the second antenna 2, the first tuner 3, the second tuner 4, the first OFDM demodulator 5, and the second OFDM demodulator 6 are provided. Diversity combining the TS output from the OFDM demodulator 5 and the second OFDM demodulator 6 with the diversity combiner 7 to improve reception performance and receive high-definition terrestrial digital broadcast content Is possible.

The error correction unit 8 corrects errors that occur during transmission, calculates an error correction rate, and inputs the error correction rate to the control unit 15. The control unit 15 determines that the reception state has deteriorated when the error correction rate exceeds a predetermined value (for example, 50%). The demultiplexer unit 9 is configured to store TS packets (video TS packet VPf / audio TS packet APf) of a weak layer program (full segment program) selected by the user from multiplexed TS packets, a program of a high layer (one segment program). The TS packets (video TS packet VPo / audio TS packet APo) are separated and input to the full-segment / one-segment switching control unit 10, and the data stream (program arrangement information) DTP is separated and input to the data decoder 11. The data decoder 11 decodes the data stream and inputs it to the control unit 13. The program arrangement information includes weak-layer program information (full-segment program information) H-EIT and strong-layer program information (one-segment program information) L-EIT. The H-EIT and L-EIT contain information about the program such as the program name, broadcast date and time, and description of the content. The program can be specified by event_id, which is information for identifying the program. is there.
The full-segment / one-segment switching control unit 10 selects one of the full-segment audio TS packet APf and the one-segment audio TS packet APo based on the user's full-segment program selection signal and full-segment / one-segment switching signal, and outputs an audio output unit. 12, one of the video TS packet VPf of the full segment program and the video TS packet VPo of the one segment program is selected and input to the video output unit 13.
Although not shown, the operation / display unit 14 includes an operation unit and a display unit. The operation unit displays a channel selection key for selecting a channel, a program selection key for selecting a full segment program, and an electronic program guide (EPG). An EPG screen display request key for requesting a full segment, a full segment / one segment switch key for manually requesting a full segment / one segment switch, and the like are provided. The operation / display unit 14 may be a remote controller.

The control unit 15 sets the reception frequency corresponding to the channel selected by the operation of the operation / display unit 14 to the first and second tuners 3 and 4, and the full segment selected by the operation of the operation / display unit 14. The program is input to the demultiplexer unit 9.
In addition, the control unit 13 determines the quality of the reception state based on the error correction rate received from the error correction unit 8, and based on the determination result or based on a manual full segment / one segment switching operation, The switching control unit 10 is requested to perform full segment / one segment switching. Note that the control unit 15 requests automatic switching from full segment to one segment when the reception state deteriorates, and requests automatic switching from one segment to full segment when the reception state improves.
Further, the control unit 13 receives the program arrangement information from the data decoder unit 12, compares the EIT included in the program arrangement information, and determines the event_id of the weak hierarchy service program (full segment program) and the strong hierarchy service program (one segment program). ) Are equal to each other, and a full segment / one segment switching control signal is input to the full segment / one segment switching control unit 10 based on the comparison result.
Further, when an EPG screen display request is made by the operation of the operation / display unit 14, the control unit 15 inputs EPG screen information to the EPG image creation unit 16, and the EPG image creation unit 16 uses the EPG screen information. An EPG screen including channel and guidance information for all programs is created and input to the video output unit 13. The user performs channel selection and program selection with reference to the EPG screen.

  FIG. 5 is a configuration diagram of the full-segment / one-segment switching control unit 10 and includes a hard disk (HDD) 21, a write control unit 22, a read control unit 23, a selector 24, an audio decoder 25, and a video decoder 26. A hard disk (HDD) 21 appropriately stores TS packets (video TS packet VPf / audio TS packet APf) of full-segment programs and TS packets (video TS packets VPo / audio TS packets APo) of one-segment programs, and a write control unit 22 Controls the writing of TS packets of each program to the HDD, the read control unit 23 controls the reading of TS packets of each program from the HDD, and the selector 24 selects the audio TS packet APf of the full segment program and the one segment program. One of the audio TS packets APo is selected and input to the audio decoder 25, and one of the video TS packet VPf of the full-segment program and the video TS packet VPo of the one-segment program is selected and input to the video decoder 26. The audio decoder 25 decodes the input audio TS packet and outputs it as a PCM audio signal. The video decoder 26 decodes the input video TS packet and outputs it as a video signal.

(C) First Embodiment of Full Seg / One Seg Output Switching Control FIGS. 6 and 7 are process flows of the first embodiment of full seg / one seg output switching control, corresponding to the control described in FIGS. It is an example. In addition, it demonstrates as what receives a full segment program first.
The channel to be received by the operation / display unit 14 and the full segment program in the channel are selected and input to the control unit 15 (step 101). Thereby, the control unit 15 tunes to the channel selected by the user by the first and second tuners 3 and 4. Further, the control unit 15 inputs the full-segment program information selected by the user to the demultiplexer 9, and the demultiplexer 9 selects the full-segment program TS packet and the one-segment program TS packet selected by the user to select the full-segment / one-segment switching control unit. Enter in 10.
Further, the control unit 15 refers to the H-EIT and L-EIT included in the program sequence information, compares the event-ID indicating the content of the full-segment program with the event-ID indicating the content of the one-segment program (step 102), If they match, event-ID match switching processing is executed (step 103). That is, in step 103 (see FIG. 7), the control unit 15 instructs the selector 24 of the full-segment / one-segment switching control unit 10 to output the TS packet of the full-segment program at the initial stage. APf and video TS packet VPf are selected and input to audio output unit 12 and video output unit 13, respectively, and a full segment program is output in real time (step 201). In the event-ID matching switching process, the hard disk HDD is not controlled to store TS packets of each program.

  Next, the control unit 15 monitors whether there is a switching instruction manually or automatically (step 202), and if there is no switching instruction, continues to receive the full segment program. However, if there is a switching instruction, it is checked whether a full-segment program is currently being output or a one-segment program is being output (step 203) .If a full-segment program is being output, the control unit 15 sends a one-segment program to the selector 24. Instructs to output the TS packet of the program. Thereby, the selector 24 selects the audio TS packet APo and video TS packet VPo of the received one-segment program and inputs them to the audio output unit 12 and the video output unit 13 at the reception timing to output the one-segment program in real time (step 204). Thereafter, the control unit 15 monitors whether there is a switching instruction (step 205), and if there is no switching instruction, monitors whether the operation / display unit 14 has instructed reception end (step 206). The one-segment output switching control process is terminated. However, if the end of reception is not instructed, the process returns to step 204 and the subsequent processing is repeated to continue receiving the one-segment program. If there is a switching instruction in step 205, the process returns to step 203 and the subsequent processes are repeated.

  On the other hand, if the one-segment program is being output in step 203, the control unit 15 instructs the selector 24 of the full-segment / one-segment switching control unit 10 to output the TS packet of the full-segment program. Thus, the selector 24 selects the audio TS packet APf and video TS packet VPf of the received full-segment program and inputs them to the audio output unit 12 and the video output unit 13 at the reception timing to output the full-segment program in real time (step 207). Thereafter, the control unit 15 monitors whether there is a switching instruction (step 208), and if there is no switching instruction, monitors whether the reception end is instructed (step 209), and when the reception end is instructed, performs the full segment / one segment output switching control process. finish. However, if the end of reception is not instructed, the process returns to step 207 and the subsequent processes are repeated to continue receiving the full-segment program. If there is a switching instruction in step 208, the process returns to step 203 and the subsequent processes are repeated.

Returning to FIG. 6, if the event-ID indicating the content of the full-segment program differs from the event-ID indicating the content of the one-segment program in step 102, the control unit 15 controls the write control unit 22 (FIG. 5) to The audio TS packet APo and video TS packet VPo are continuously written from the address Af of the hard disk HDD 21 and accumulated. In parallel with the above, the control unit 15 instructs the selector 24 of the full segment / one segment switching control unit 10 to output TS packets of the full segment program in real time. Thereby, the selector 24 selects the audio TS packet APf and the video TS packet VPf of the received full-segment program, inputs them to the audio output unit 12 and the video output unit 13 at the reception timing, and outputs the full-segment program in real time (step 104). Further, the control unit 15 stores Af as an address RAO to be read from the hard disk HDD (RAO = Af). That is, the address RAO (= Af) to be read from the hard disk HDD when full segment → one segment switching is performed is stored (step 105).
Next, the control unit 15 monitors whether there is a switching instruction (step 106), and if there is no switching instruction, continues to receive the full segment program. However, if there is a switching instruction, it is checked whether a full-segment program is currently being output or a one-segment program is being output (step 107). If the full-segment program is being output, the control unit 15 instructs the read control unit 23 of the full-segment / one-segment switching control unit 10 to read out the TS packet of the one-segment program from the address RAO of the hard disk 21, and The output of the TS packet of the one-segment program read from the read control unit 23 is instructed. As a result, the selector 24 selects the audio TS packet APo and video TS packet VPo of the one-seg program read and output from the read-out control unit 23 and inputs them to the audio output unit 12 and the video output unit 13, respectively. Chasing playback from the beginning (step 108). Note that the writing of the audio TS packet APo and video TS packet VPo of the one-segment program to the hard disk HDD 21 continues.

Thereafter, the control unit 15 monitors whether there is a switching instruction (step 109), and if there is no switching instruction, monitors whether the reception end is instructed (step 110), and when the reception end is instructed, performs a full segment / one segment output switching control process. finish. However, if the end of reception is not instructed, the process returns to step 108 and the subsequent processing is repeated to continue receiving the one-segment program. If there is a switching instruction in step 109, the process returns to step 107 and the subsequent processes are repeated.
On the other hand, if the one-segment program is being output in step 107, reading from the hard disk HDD is stopped and the address to be read next from the hard disk HDD (the next address that has been read) is saved as RAO (step 111). Next, the control unit 15 instructs the selector 24 of the full segment / one segment switching control unit 10 to output TS packets of the full segment program in real time. Thus, the selector 24 selects the audio TS packet APf and video TS packet VPf of the received full-segment program and inputs them to the reception timing audio output unit 12 and the video output unit 13 to output the full-segment program in real time ( Step 112). Thereafter, the control unit 15 monitors whether there is a switching instruction (step 113), and if there is no switching instruction, monitors whether the reception end is instructed (step 114), and when the reception end is instructed, performs a full segment / one segment output switching control process. finish. However, if the end of reception is not instructed, the process returns to step 112 and the subsequent processes are repeated to continue receiving the full segment program. If the switching instruction is given in step 113, the process returns to step 107 and the subsequent processes are repeated.
In the above description, the full segment program is received first, but it is also possible to receive the one segment program first.

According to the first embodiment, when the full-segment program and the one-segment program are the same, the program can be continuously viewed even if switching from full-segment to one-segment or vice versa.
Further, according to the first embodiment, even when the full-segment program and the one-segment program are different, the one-segment program can be continuously viewed from the beginning. Further, although a full segment program cannot be viewed continuously, a full segment program with good image quality can be viewed.

(D) Second Example of Full-Seg / One-Seg Output Switching Control FIG. 8 is a processing flow of a second example of full-seg / one-seg output switching control, which corresponds to the control described in FIG. In addition, it demonstrates as what receives a full segment program first. Further, the processing in steps 101 to 103 is the same as that in the first embodiment, and a description thereof will be omitted.
If the event-ID indicating the content of the full-segment program is different from the event-ID indicating the content of the one-segment program in step 102, the control unit 15 controls the write control unit 22 (FIG. 5) to control the TS packet (audio TS) of the full-segment program. Both the packet APf and the video TS packet VPf) and the TS packet (audio TS packet APo and video TS packet VPo) of the one-segment program are continuously written from the addresses Af and Ao of the hard disk HDD 21 and accumulated. In parallel with the above, the control unit 15 instructs the selector 24 of the full segment / one segment switching control unit 10 to output the TS packet of the full segment program in real time. As a result, the selector 24 selects the audio TS packet APf and video TS packet VPf of the full segment program, inputs them to the audio output unit 12 and the video output unit 13 at the reception timing, and outputs the full segment program in real time (step 301). . Further, the control unit 15 saves Af as the full segment program address RAF to be read from the hard disk HDD, and saves Ao as the one segment program address RAO to be read from the hard disk HDD (step 302).

Next, the control unit 15 monitors whether there is a switching instruction (step 303), and if there is no switching instruction, continues to receive a full segment program. However, if there is a switching instruction, it is checked whether a full-segment program is currently being output or a one-segment program is being output (step 304). If the full segment program is being output, the control unit 15 stores the full segment program address to be read next from the hard disk HDD (the next address that has been read) as the RAF (step 305). Next, the control unit 15 instructs the read control unit 23 of the full-segment / one-segment switching control unit 10 to read the TS packet of the one-segment program from the address RAO of the hard disk 21, and reads the selector 24 from the read control unit 23, Instructs to output TS packet of the output one-segment program. As a result, the control unit 15 selects the audio TS packet APo and the video TS packet VPo of the one-seg program read from the read-out control unit 23 and inputs them to the audio output unit 12 and the video output unit 13 to start the one-seg program. And chasing playback (step 306). Note that writing of TS packets of full-segment programs and one-segment programs to the hard disk HDD 21 is continued.
Thereafter, the control unit 15 monitors whether there is a switching instruction (step 307), and if there is no switching instruction, monitors whether reception is instructed (this step is not shown in the figure), and when reception is instructed, full segment / one segment output The switching control process is terminated. However, if the end of reception is not instructed, the process returns to step 306 and the subsequent processing is repeated to continue receiving the one-segment program. If there is a switching instruction in step 307, the process returns to step 304 and the subsequent processes are repeated.

  On the other hand, if the one-segment program is being output in step 304, reading from the hard disk HDD is stopped and the address to be read next from the hard disk HDD (the next address after reading is completed) is stored as RAO (step 310). Next, the control unit 15 checks whether the switching is performed manually or automatically based on the reception quality (step 311). When the switching instruction is made manually, the reception state of the full segment image is good, so the control unit 15 sends the TS packet of the full segment program from the address RAF of the hard disk 21 to the read control unit 23 of the full segment / one segment switching control unit 10. And the selector 24 is instructed to output the TS packet of the full segment program read from the read control unit 23. As a result, the selector 24 selects the audio TS packet APf and the video TS packet VPf of the full segment program read from the readout control unit 23 and inputs them to the audio output unit 12 and the video output unit 13, respectively. Chase playback is performed (step 312). Note that writing of TS packets of full-segment programs and one-segment programs to the hard disk HDD 21 is continued.

Thereafter, the control unit 15 monitors whether there is a switching instruction (step 313), and if there is no switching instruction, monitors whether reception is instructed (this step is not shown in the figure), and when reception is instructed, full segment / one segment output The switching control process is terminated. However, if the end of reception is not instructed, the process returns to step 312 and the subsequent processing is repeated to continue receiving the one-segment program. If there is a switching instruction in step 313, the process returns to step 304 and the subsequent processes are repeated.
On the other hand, when the switching instruction is automatically made in step 311, the full-segment program is not received and the chasing search is not performed for the full-segment program. That is, the control unit 15 instructs the selector 24 of the full-segment / one-segment switching control unit 10 to output the received TS packet of the full-segment program in real time. As a result, the selector 24 subsequently selects the audio TS packet APf and video TS packet VPf of the received full-segment program, inputs them to the audio output unit 12 and the video output unit 13 at the reception timing, and outputs the full-segment program in real time. (Step 314).
Thereafter, the control unit 15 monitors whether there is a switching instruction (step 315), and if there is no switching instruction, monitors whether reception is instructed (this step is not shown), and when the reception end is instructed, full segment / one segment output The switching control process is terminated. However, if the end of reception is not instructed, the process returns to step 314 and the subsequent processes are repeated to continue receiving the full segment program. If there is a switching instruction in step 315, the process returns to step 304 and the subsequent processes are repeated.
In the above description, the full segment program is received first, but it is also possible to receive the one segment program first.

According to the second embodiment, if the full-segment program and the one-segment program are the same, the mayor can be continuously displayed even if the full-segment → one-segment program or vice versa is switched.
Further, according to the second embodiment, even when the full-segment program and the one-segment program are different, the one-segment program can be continuously viewed from the beginning regardless of whether the switching is performed manually or automatically. Further, according to the second embodiment, even when the full-segment program and the one-segment program are different, the full-segment program can be continuously viewed from the beginning if switching is performed manually. Further, according to the second embodiment, when the full-segment program is different from the one-segment program, and when the switching is automatically performed, the full-segment program cannot be viewed continuously but the full-segment program with good image quality can be viewed. .

It is switching control explanatory drawing in case the content of a full segment program and the 1 segment program is the same. FIG. 10 is a first switching control explanatory diagram when the contents of a full-segment program and a one-segment program are different. FIG. 10 is a second explanatory diagram of switching control when the contents of a full-segment program and a one-segment program are different. It is a block diagram of the terrestrial digital broadcast receiver of this invention. It is a block diagram of a full segment / one segment switching control part. 3 is a processing flow of a first embodiment of full-segment / one-segment output switching control. It is a processing flow of the first embodiment of full segment / one segment output switching control (when the contents of the full segment program and the one segment program are the same). It is a processing flow of 2nd Example of full segment / one segment output switching control. It is explanatory drawing of the transmission system of terrestrial television broadcasting. It is explanatory drawing of EIT (Event Information Table). It is explanatory drawing of reception switching of a full segment and a one segment program based on the quality of a reception state. FIG. 11 is a first explanatory diagram of a conventional reception switching method for full-segment and one-segment programs. FIG. 10 is a second explanatory diagram of a conventional reception switching method for full-segment and one-segment programs. FIG. 11 is a third explanatory diagram of a conventional full segment and one segment program reception switching method.

Explanation of symbols

1, 2 1st, 2nd antenna 3, 4 1st, 2nd tuner 5, 6 1st, 2nd OFDM demodulator 7 Diversity combiner 8 Error corrector 9 Demultiplexer 10 Full segment / one segment switching Control unit 11 Data decoder 12 Audio output unit 13 Video output unit 14 Operation / display unit 15 Control unit 16 EPG image creation unit

Claims (6)

In a reception method of a terrestrial digital broadcast receiver for receiving a terrestrial digital broadcast in which a weak hierarchy service program and a strong hierarchy service program exist in the same channel,
Check whether the received weak service program and the strong service program are the same,
If they are the same, when the output switching between the weak hierarchical service program and the strong hierarchical service program is instructed, the video and audio signals of the program that has been output are replaced with the program that has not been output until then. Output video and audio signals at the reception timing,
If they are different, store the video signal and audio signal of the strong hierarchical service program,
If the output switching from the weak hierarchy service program to the strong hierarchy service program is instructed, the video signal and the audio signal of the strong hierarchy service program are controlled to be continuously output from the beginning using the stored signal,
If output switching from the strong hierarchy service program to the weak hierarchy service program is instructed, the video and audio signals of the weak hierarchy service program are output at the reception timing.
A receiving method for a terrestrial digital broadcast receiver. In a reception method of a terrestrial digital broadcast receiver for receiving a terrestrial digital broadcast in which a weak hierarchy service program and a strong hierarchy service program exist in the same channel,
Check whether the received weak service program and the strong service program are the same,
If the weak layer service program and the strong layer service program are the same, and the output switching between the weak layer service program and the strong layer service program is instructed, instead of the video and audio signals of the program that was being output, Output the video and audio signals of the program that was not being output until then at the reception timing,
If the weak hierarchical service program is different from the strong hierarchical service program and the output switching between the weak hierarchical service program and the strong hierarchical service program is automatically instructed based on the reception quality, only the strong hierarchical service program has video signals and audio. Switching control so that the signal is output continuously from the beginning,
If the weak hierarchical service program is different from the strong hierarchical service program, and the output switching between the weak hierarchical service program and the strong hierarchical service program is manually instructed, the video signal and audio signal of each program are continuously output from the beginning. To control,
A receiving method for a terrestrial digital broadcast receiver. If the weak hierarchy service program and the strong hierarchy service program are different, the video signal and the audio signal of the program by the weak hierarchy service and the program by the strong hierarchy service are stored,
When the output switching of the program is automatically instructed based on the reception quality, the video signal and the audio signal of the strong hierarchical service program are controlled to be output continuously from the beginning using the stored signal, Control the video signal and audio signal of the weak hierarchical service program to be output at the reception timing,
When the output switching of the program is manually instructed, the video and audio of each program are controlled to be continuously output from the beginning using the storage signal.
The receiving method of the terrestrial digital broadcast receiver according to claim 2. In a terrestrial digital broadcast receiver that receives a terrestrial digital broadcast in which a weak hierarchical service program and a strong hierarchical service program exist in the same channel,
A program selection unit for selecting a weak hierarchical service program to be received;
Means for checking whether the received weak hierarchical service program and the strong hierarchical service program are the same;
A receiving unit for receiving a broadcast signal including a weak hierarchy service program and a strong hierarchy service program;
A storage unit for storing video signals and audio signals of strong hierarchical service programs;
A switching instruction unit for instructing output switching between the weak hierarchical service program and the strong hierarchical service program;
If the received weak hierarchy service program and the strong hierarchy service program are the same, when the output switching between the weak hierarchy service program and the strong hierarchy service program is instructed, the video and audio signals of the program that has been output until then Instead, the video and audio signals of the program that had not been output until then are output at the reception timing, and if they are different, if the output switching from the weak hierarchical service program to the strong hierarchical service program is instructed, the storage unit Control is performed so that the video signal and audio signal of the strong hierarchical service program are continuously output from the beginning by using the stored signal stored, and the output switching from the strong hierarchical service program to the weak hierarchical service program is instructed. For example, a switching control unit for controlling the video and audio signals of the weak hierarchy service program to be output at the reception timing;
A terrestrial digital broadcast receiver characterized by comprising: In a terrestrial digital broadcast receiver that receives a terrestrial digital broadcast in which a weak hierarchical service program and a strong hierarchical service program exist in the same channel,
A reception quality detection unit for detecting the reception quality of the weak hierarchy service program;
A program selection unit for selecting a weak hierarchical service program to be received;
Means for checking whether the received weak hierarchical service program and the strong hierarchical service program are the same;
A receiving unit for receiving a broadcast signal including a weak hierarchy service program and a strong hierarchy service program;
A switching instruction unit for automatically instructing output switching between the weak hierarchical service program and the strong hierarchical service program based on the reception quality;
A switching instruction unit for manually instructing output switching between the weak hierarchical service program and the strong hierarchical service program;
If the weak hierarchical service program and the strong hierarchical service program are the same, and the output switching between the weak hierarchical service program and the strong hierarchical service program is instructed, the video signal and audio signal of the program that was being output are replaced. The video signal and audio signal of the program that was not being output until now are output at the reception timing, and the weak hierarchical service program and the strong hierarchical service program are different, and the output switching between the weak hierarchical service program and the strong hierarchical service program is received. If automatically instructed based on quality, the video signal and audio signal of the strong hierarchical service program are controlled to be output continuously from the beginning, and the video signal and audio signal of the weak hierarchical service program are controlled. Is controlled to be output at the reception timing, and the weak hierarchical service program and the strong hierarchical service program are different, and the weak hierarchical service program and the strong hierarchical service program are Switching control unit which forces switching is if instructed manually controlled so that the video and audio signals of each program is continuously output from the start,
A terrestrial digital broadcast receiver characterized by comprising: If the weak hierarchical service program is different from the strong hierarchical service program, the storage unit stores the video signal and the audio signal of the weak hierarchical service program and the strong hierarchical service program,
When the switching of the output of the program is automatically instructed based on the reception quality, the switching control unit outputs the video signal and the audio signal continuously from the beginning only for the strong hierarchical service program using the stored signal. And when the output switching of the program is manually instructed, the video and audio of each program are controlled to be continuously output from the beginning using the stored signal.
The terrestrial digital broadcast receiver according to claim 5.

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