JP4040053B2 - Digital broadcast receiving apparatus and digital broadcast receiving method - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus and a digital broadcast reception signal processing method for receiving and reproducing digital video and audio broadcasts, and more particularly, operability in selecting a different program when receiving a digital broadcast program. The present invention relates to a device configuration and a received signal processing method.

  FIG. 11 is an internal block diagram showing a conventional digital broadcast receiving apparatus disclosed in, for example, US Pat. No. 5,231,494. In the figure, 1 is a conventional digital broadcast receiving apparatus, 2 is an external input signal (ie, a digital broadcast signal) input from the outside to the digital broadcast receiving apparatus 1, and 3 is a first tuner section that receives the external input signal 2. 4 includes a first program group including at least one program, a first common program information regarding the first program group, and a first unique program information regarding the first program group. , 5 is a first demultiplexer for separating and extracting the first program, the first common program information, and the first unique program information from the first bit stream 4, and 6 is the first A decoder unit for reproducing the first program extracted by the demultiplexer unit 5 into a video signal or an audio signal, 7 is a conventional arithmetic / control device for controlling those functions, 8 is a control bus for the arithmetic / control device 7, 9 is Moni It is a display device, such as chromatography and speakers. Reference numeral 10 denotes an input device used for transmitting a command for selecting an arbitrary (that is, desired) program to the arithmetic / control device 7 by the user. Each of the first tuner unit 3 and the first demultiplexer unit 5 can transmit information to the arithmetic / control device 7 via the control bus 8 and can receive instructions from the arithmetic / control device 7. .

  FIG. 12 shows a transport stream structure of an MPEG (Moving Picture Experts Group) -2 system defined by ISO / IEC13818-1 as an example of the first bitstream 4. In the figure, 11a is a transport packet having a fixed length of 188 bytes constituting the transport stream, 11b is a PID (Packet Identification) for identifying the transport packet 11a, and 11c stores data such as compressed digital video. It is a payload that is an area to be processed.

  FIGS. 13 and 14 show examples of the first common program information and the first unique program information that are mapped and transmitted in the payload 11c. FIG. 13 shows the structure of a PAT (Program Association Table) of the MPEG-2 system defined by ISO / IEC13818-1. In the figure, 12a is a table identifier, 12b is a broadcast program number identifier, and 12c is a program map PID indicating the PID of a PMT described later. FIG. 14 shows the structure of a PMT (Program Map Table) of the MPEG-2 system defined by ISO / IEC13818-1. In the figure, 13a is a table identifier, 13b is a stream format identifier, and 13c is an elementary PID indicating in which transport packet 11a video and audio data is transmitted.

  Next, a specific operation (that is, reception signal processing) will be described. FIG. 15 is a flowchart showing an operation of extracting an arbitrary first program by the conventional digital broadcast receiving apparatus and a signal processing procedure. In such a conventional digital broadcast receiving apparatus, an external input signal 2 is first input to the digital broadcast receiving apparatus 1 from a coaxial cable, a satellite broadcast receiving antenna or the like. For example, in the case of digital satellite broadcasting, the external input signal 2 is a signal having a transmission rate of about 40 megabits per second per 27 MHz bandwidth.

  Normally, the external input signal 2 is composed of a plurality of bit streams, and an arbitrary bit stream can be extracted by controlling the first tuner unit 3. Here, it is assumed that the external input signal 2 is composed of a first bit stream and a second bit stream.

  From this state, the user transmits a command for receiving the desired first program to the arithmetic / control device 7 using the input device 10 (step 100 in FIG. 15). Next, the arithmetic / control device 7 controls the first tuner unit 3 receiving the external input signal 2 to extract the first bit stream 4 (step 101 in FIG. 15). Here, the first bit stream 4 is a digital bit stream including at least one or more first programs, at least one or more first common program information, and at least one or more first unique program information. It shall be. The first procedure is to extract the first bit stream 4.

  FIG. 12 shows an example of the first bit stream 4, which has the transport stream structure of the MPEG-2 system defined by ISO / IEC13818-1. The transport stream is composed of transport packets 11a having a fixed length of 188 bytes, and is identified by PID 11b. When the first bit stream 4 is input, the first demultiplexer unit 5 checks the PID 11b of each transmitted transport packet 11a and searches for a transport packet 11a having a value of 0 ( Step 102 in FIG.

  The first common program information shared in the first bit stream 4 as shown in FIG. 13 is stored in the payload 11c of the transport packet 11a in which the value of the PID 11b is 0. . The first demultiplexer unit 5 extracts the first common program information detected by the above procedure. The first common program information is taken into the arithmetic / control device 7 via the control bus 8 and analyzed (step 103 in FIG. 15). If the program selected by the user at this stage is not included in the first bitstream 4, the process returns to the first procedure and is performed again from the extraction of the bitstream (step 104 in FIG. 15). The procedure so far is referred to as a second procedure.

  FIG. 13 shows an example of the first common program information. Here, it is assumed that the PAT (Program Association Table) structure of the MPEG-2 system defined by ISO / IEC13818-1 is adopted. The PAT is a common program information table that is normally transmitted only for one bit stream. In FIG. 13, a table identifier 12a indicates that this structure is PAT, a broadcast program number identifier 12b indicates an identification number assigned to each program, and a program map PID 12c is unique to each program. A PID 11b of a transport packet 11a for transmitting one unique program information PMT (Program Map Table) is shown.

  Usually, in digital broadcasting, since a plurality of programs exist in one bit stream, it is difficult to transmit all program information using only one common program information table. Therefore, the program information is often divided and transmitted as common and unique program information. Based on the analyzed first common program information, the arithmetic / control device 7 extracts a transport packet 11a for transmitting first unique program information corresponding to an arbitrary first program designated by the user. The command is transmitted to the first demultiplexer unit 5 via the control bus 8 (step 105 in FIG. 15). The procedure so far is referred to as a third procedure.

  Upon receiving the command, the first demultiplexer unit 5 checks the PID 11b of each transport packet 11a transmitted from the first bit stream 4, and this time, any first program designated by the user is selected. Is searched for a transport packet 11a having the same value as the PID 11b of the transport packet 11a for transmitting the first unique program information corresponding to (step 106 in FIG. 15). The first unique program information as shown in FIG. 14 is stored in the payload 11c of the transport packet 11a having the same value of the PID 11b. The procedure so far is referred to as a fourth procedure.

  FIG. 14 shows an example of the first unique program information. Here, it is assumed that the PMT structure of the MPEG-2 system defined by ISO / IEC13818-1 is adopted. The PMT is a program information table that is normally transmitted only for one program. In FIG. 14, a table identifier 13a indicates that this structure is a PMT, a stream format identifier 13b indicates a format of a program data stream, and an elementary PID 13c indicates a transport packet for transmitting each program component. PID 11b for identifying 11a is shown. The first unique program information is extracted by the first demultiplexer unit 5 and taken into the arithmetic / control device 7 through the control bus 8. Based on the first unique program information, the arithmetic / control device 7 sends a command for extracting a transport packet 11a for transmitting an arbitrary first program designated by the user via the control bus 8. 1 to the demultiplexer unit 1 (step 107 in FIG. 15). The procedure so far is referred to as a fifth procedure.

  Upon receiving the command, the first demultiplexer unit 5 checks the PID 11b of each transport packet 11a transmitted from the first bit stream 4, and this time, any first program designated by the user is selected. A transport packet 11a having a value that matches the PID 11b of the transport packet 11a that transmits the constituent elements is searched (step 108 in FIG. 15). Generally, there are a plurality of PIDs 11b of the transport packet 11a for transmitting the first program, such as normal video data and audio data. The payload 11c of the transport packet 11a with the matching PID 11b includes, for example, a video signal encoded according to the MPEG-2 video format defined by ISO / IEC13818-2, or MPEG-1 defined by ISO / IEC11072-3. The components of the first program consisting of an audio signal encoded according to the audio format and the like are stored, and the first demultiplexer unit 5 transmits them to the decoder unit 6 and reproduces them into a video signal and an audio signal. (Step 109 in FIG. 15). The procedure so far is defined as a sixth procedure.

  After being reproduced as a video signal or an audio signal according to the above first to sixth procedures, it is output to a display device 9 such as a video monitor or a speaker and provided to the user. Further, it is monitored whether or not the user has transmitted a command for selecting a new program using the input device 10 to the arithmetic / control device 7 (step 110 in FIG. 15), and when a new program is selected. Based on the first common program information PAT that has already been extracted and analyzed, it is determined whether or not the program is included in the first bit stream 4 that is currently extracted (step 111 in FIG. 15). If the new program is included in the currently extracted first bit stream 4, it is only necessary to repeat the third and subsequent procedures. If not, the program returns to the first procedure and returns to the new bit. Repeat from stream extraction.

US Pat. No. 5,231,494

  Since the conventional digital broadcast receiving apparatus is configured as described above, when any new program selected by the user is included in a bitstream different from the first bitstream 4 currently extracted, It is necessary to start again from the first procedure, for example, starting from the extraction of a new bitstream by controlling the first tuner unit 3.

  Since the first common program information and the first unique program information are normally transmitted only several times per second, a time lag of several tens to several hundred milliseconds may occur depending on the timing of starting the procedure. .

  In that case, as a result, a time of 1 second or more (that is, a time lag) is required until the program is actually reproduced after the user selects an arbitrary program, and the operability of the digital broadcast receiving apparatus is lowered. There were problems such as. In general, it is said that if a time lag of 0.5 seconds or more occurs after the user selects an arbitrary program until the program is displayed, the user feels stress on the operability.

  In addition, after the user selects an arbitrary new program, the first tuner unit 3 starts extracting a new bitstream, so that the program is displayed to the user until the first to sixth procedures are completed. There was a problem that there was a blank time zone in which no playback video or audio could be provided.

The present invention has been made to solve the above problems, and uses the first program after the user selects an arbitrary second program until the program can actually be played back. It is possible to provide a digital broadcast receiving apparatus with good operability, which can eliminate the blank time during preparation for program extraction that cannot be provided to the user.

  In the digital broadcast receiving apparatus according to the present invention, each bit stream includes one or more programs, unique program information for specifying the programs, and common program information including information indicating the unique program information. A digital broadcast receiving apparatus for receiving a digital broadcast signal including a plurality of bit streams and reproducing a video of a desired program included in the plurality of bit streams, wherein the first bit stream is extracted from the digital broadcast signals A first tuner unit that extracts the first program and the first common program information from the first bitstream extracted in the first tuner unit, and A second tuner unit for extracting a second bit stream different from the first bit stream from the digital broadcast signal; A demultiplexer for extracting a second program and second common program information from the second bitstream extracted in the second tuner, and the first program or the second program A decoder unit for reproducing any one of the video and input command processing means for monitoring whether the user has input a command for selecting a program different from the video program being reproduced in the decoder means, When the command for selecting the different program is input to the command processing means, the program before the selection is continued to be played until the different program can be played.

According to the digital broadcast receiving apparatus according to the present invention , the first program can be provided to the user from when the user selects an arbitrary second program until the program can actually be reproduced. Thus, it is possible to eliminate the blank time during the program extraction preparation that cannot provide the program to the user, and it is possible to obtain a digital broadcast receiving apparatus with good operability .

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the figure, the same reference numerals as in the prior art represent the same or equivalent ones as in the prior art.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to Embodiment 1 of the present invention. In the figure, 100 is a digital broadcast receiving apparatus, 2 is an external input signal (ie, a digital broadcast signal) input from the outside to the digital broadcast receiving apparatus 100, 3 is a first tuner unit that receives an external input signal 2, and 4 is A first bit including a first program group composed of at least one program, first common program information related to the first program group, and first unique program information related to the first program group A stream 5 is a first demultiplexer unit that separates and extracts the first program, the first common program information, and the first unique program information from the first bit stream 4.

  Reference numeral 14 denotes a second tuner unit for receiving the external input signal 2, reference numeral 15 denotes a second bit stream including at least one second program group and second program information relating to the program, and reference numeral 16 denotes a second bit stream. The second demultiplexer unit extracts the second program and the second program information from the two bit streams 15. Reference numeral 6 denotes a decoder unit for reproducing the first and second programs extracted by the first demultiplexer unit 5 and the second demultiplexer unit 16 into video signals and audio signals. Reference numeral 9 denotes a display device such as a monitor or a speaker. is there. Reference numeral 10 denotes an input device used to transmit a command for the user to select an arbitrary program to the arithmetic / control device 70.

  Here, 70 is a calculation / control device composed of a CPU (Central Processing Unit) and its peripheral devices, and 70a monitors a command inputted by the user using the input device 10, receives the command, An input command processing unit 70b for analyzing the contents, a peripheral interface unit 70b for controlling the first demultiplexer unit 5 and the like via the control bus 8 and receiving information from them via the control bus 8, 70c A calculation / control unit 70d that manages analysis, storage, calculation, and the like is a program information storage unit that can store and analyze the contents of common program information and unique program information. Here, the calculation / control unit 70c is used. Is configured as part of

  The external input signal 2 (that is, the received digital broadcast signal) is composed of a first bit stream 4 and a second bit stream 15, and the second bit stream 15 is different from the first bit stream 4. It is assumed that different program groups and program information related to the programs are included. Each of the second tuner unit 14 and the second demultiplexer unit can transmit information to the arithmetic / control device 70 via the control bus 8, and conversely, can receive a command from the arithmetic / control device 70.

  In the digital broadcast receiving apparatus according to the first embodiment configured as described above, two different bit streams transmitted by the external input signal 2, that is, the first bit stream 4 and the second bit stream 15 are received. The first tuner unit 3 and the second tuner unit 14 can simultaneously extract each. The first bit stream 4 and the second bit stream 15 include different first and second common program information and unique program information, respectively, but the first demultiplexer unit 5 and the second bit stream 15 are different from each other. The demultiplexer unit 16 can perform extraction simultaneously. Therefore, the arithmetic / control device 70 can take in the first and second common program information and unique program information via the control bus 8 and simultaneously analyze them.

  Here, consider a case where the user selects an arbitrary second program during playback of the first program, and the second program is included in a bitstream different from that of the first program. FIG. 2 is a flowchart showing an example of the operation and signal processing procedure of the digital broadcast receiving apparatus according to the first embodiment of the present invention. In the figure, steps 101a to 111a and steps 101b to 111b perform the same operations as steps 101 to 111 in FIG. 15 of the conventional example. The first tuner unit 3 extracts the first bit stream 4 from the external input signal 2, and the first bit stream 4 includes the first common program information, the first unique program information, and the first The program is included. Here, as in the conventional example, it is assumed that the first common program information is transmitted in the MPEG-2 PAT structure and the first unique program information is transmitted in the MPEG-2 PMT structure.

  The arithmetic / control device 70 analyzes the first common program information PAT extracted by the first demultiplexer unit 5, and based on the analysis result, the first unique program information PMT is again converted into the first demultiplexer. Part 5 is used for extraction. The arithmetic / control device 70 analyzes the first unique program information PMT extracted by the first demultiplexer unit 5, and based on the result of the analysis, the first program from the first bit stream 4 is again generated. 1 is extracted using the demultiplexer unit 5, transmitted to the decoder unit 6, and reproduced. Necessary information in the first common program information PAT and the first unique program information PMT is stored in the program information storage unit 70d in the calculation / control unit 70c. The operation up to this point is the same as the conventional procedure from the first procedure to the sixth procedure.

  In the first embodiment of the present invention, after the sixth procedure, the second common program information is analyzed in advance (step 112a in FIG. 2). During reproduction of the first program, the second tuner unit 14 extracts the second bit stream 15 in advance (step 101b in FIG. 2). The second bit stream 15 includes second common program information, second unique program information, and a second program. When the second bitstream 15 is input, the second demultiplexer unit 16 checks the PID 11b of each transport packet 11a transmitted and searches for a transport packet 11a having a value of 0 ( In step 102b) of FIG. 2, the second common program information stored in the payload 11c and transmitted, for example, in the MPEG-2 PAT structure is extracted.

The second demultiplexer unit 16 passes the extracted second common program information PAT to the peripheral interface unit 70 b of the arithmetic / control device 70 via the control bus 8.
The peripheral interface unit 70b transmits the received second common program information PAT to the calculation / control unit 70c of the calculation / control device 70, and the program information storage unit 70d in the calculation / control unit 70c receives the second common program information. Necessary information is stored in the PAT. As described above, the arithmetic / control device 70 takes in the second common program information PAT and analyzes it (step 103b in FIG. 2).

  Further, the input command processing unit 70a of the arithmetic / control device 70 constantly monitors whether the user has transmitted a command for selecting a new program using the input device 10 (step 110a in FIG. 2). When a command for selecting a new program from the user is detected, the command information is transmitted to the calculation / control unit 70c. First, based on the first common program information PAT already stored in the program information storage unit 70d, the calculation / control unit 70c determines whether the program is included in the first bitstream 4 currently extracted. (Step 111a in FIG. 2). If it is included, the third and subsequent steps are repeated.

  Next, consider a case where a user transmits a command to reproduce the second program to the digital broadcast receiving apparatus during reproduction of the first program. When the second program is not described in the first common program information PAT stored in the program information storage unit 70d in the calculation / control device 70, the calculation / control unit 70c It is determined that one tuner unit 3 is not included in the first bit stream 4 being extracted (step 111a in FIG. 2). Next, the calculation / control unit 70c in the calculation / control device 70 is described in the second common program information PAT stored in the program information storage unit 70d as in the third procedure. (Step 104b in FIG. 2). When the second program is described in the second common program information, the arithmetic / control device 70 sends a command for extracting the second program according to the contents to the second demultiplexer unit 16 to the peripheral interface unit. 70b is transmitted via the control bus 8 (step 105b in FIG. 2).

  Upon receiving the command, the second demultiplexer 16 receives the second unique program information transmitted in the MPEG-2 PMT structure, for example, from the second bit stream 15 as in the fourth procedure. Is extracted (step 106b in FIG. 2). Next, the arithmetic / control device 70 analyzes the second unique program information PMT as in the fifth procedure. The second demultiplexer unit 16 passes the extracted second unique program information PMT to the peripheral interface unit 70 b of the arithmetic / control device 70 via the control bus 8. The peripheral interface unit 70b transmits the received second unique program information PMT to the calculation / control unit 70c of the calculation / control device 70, and the program information storage unit 70d in the calculation / control unit 70c receives the second unique program information. Necessary information is stored from the PMT (step 107b in FIG. 2).

  Further, the second demultiplexer unit 16 extracts the second program from the second bit stream 15 as in the sixth procedure (step 108b in FIG. 2). The second program separated by the second demultiplexer unit 16 is sent to the decoder unit 6 and reproduced as a video signal or an audio signal, and then output to a display device 9 such as a video monitor or a speaker (see FIG. 2 step 109b). Similarly, in preparation for the user selecting a new program next, first common program information PMT is extracted in advance during reproduction of the second program and stored in the program information storage unit 70d (FIG. 2 step 112b).

  As described above, when the instruction to reproduce the second program by the user is transmitted to the digital broadcast receiver, the extraction of the second bit stream 15 and the second common program information are extracted, the contents are analyzed and stored. Therefore, the operation may be performed after the third procedure, that is, after the extraction of the second unique program information. Therefore, according to the invention of the first embodiment, it is possible to reduce the time required from when a user selects a program until the program is actually reproduced, thereby improving the operability of the digital broadcast receiving apparatus. Can be improved.

Embodiment 2. FIG.
FIG. 3 is a block diagram showing the configuration of the digital broadcast receiving apparatus 101 according to the second embodiment. The basic configuration is the same as that of the first embodiment, but the operation of the calculation / control apparatus is different. In the figure, reference numeral 71 denotes an arithmetic / control device according to the second embodiment configured by a CPU and its peripheral devices, and 71a monitors a command input by the user using the input device 10, receives the command, and displays its contents. An input command processing unit 71b for analyzing, a peripheral interface unit for controlling the first demultiplexer unit 5 and the like via the control bus 8 and receiving information from them via the control bus 8, 71c for analyzing and storing information 71d is a program information storage unit capable of storing and analyzing the contents of common program information and unique program information, and here is a part of the calculation / control unit 71c. It is configured as. In addition, the configuration of the bit stream, the program included in the bit stream, common / unique program information, and the like is the same as that of the first embodiment.

  FIG. 4 is a flowchart showing an example of the operation and signal processing procedure of the digital broadcast receiving apparatus according to the second embodiment. Steps 101a to 111a, 101b to 111b, and 101c to 111c perform the same operations as steps 101 to 111 in the conventional example of FIG. When the user selects the first program, the calculation / control apparatus 71 first extracts the first bit stream 4 by the first tuner unit 3 and the first demultiplexer unit 5 (step of FIG. 4). 101a) After extracting and analyzing the first common program information PAT (steps 102a and 103a in FIG. 4), it is determined whether or not the first program is included in the first bitstream 4 (step in FIG. 4). 104a).

  If the first program is included in the first bitstream 4, the first unique program information PMT is extracted and analyzed based on the first common program information PAT (step 105a in FIG. 4) ( Steps 106a and 107a in FIG. Further, based on the first unique program information PMT, the first demultiplexer unit 5 and the decoder unit 6 extract and reproduce the first program (steps 108a and 109a in FIG. 4). Further, the input command processing unit 71a in the arithmetic / control device 71 monitors whether or not the user has selected a new program (step 110a in FIG. 4).

  When the user transmits an instruction to reproduce the second program to the digital broadcast receiving apparatus during reproduction of the first program, the arithmetic / control unit 71c in the arithmetic / control apparatus 71 causes the program to be currently reproduced. It is determined whether it is included in the same stream as the program (step 111a in FIG. 4). If not included, it is determined whether or not the program has been played back immediately before (step 113a in FIG. 4). This is not the case because the user changed the program for the first time.

  Therefore, the arithmetic / control unit 71c extracts the second bit stream 15 from the peripheral interface unit 71b by controlling the second tuner unit 14 and the second demultiplexer unit 16 via the control bus 8 (see FIG. 4 step 101b), after extracting and analyzing the second common program information PMT (steps 102b and 103b in FIG. 4), it is determined whether the second program is included in the second bitstream 15 (FIG. 4). 4 step 104b).

  If the second program is included in the second bitstream 15, the second unique program information PMT is extracted and analyzed based on the second common program information PAT (step 105b in FIG. 4) ( Steps 106b and 107b in FIG. Further, based on the second unique program information PMT, the second program is extracted by the second demultiplexer unit 16 (step 108b in FIG. 4), transmitted to the decoder unit 6 and reproduced (step in FIG. 4). 109b).

  While continuing to reproduce the second program, the input command processing unit 71a in the arithmetic / control device 71 monitors whether the user has transmitted a command to select a new program (step in FIG. 4). 110b). The program information storage unit 71d in the arithmetic / control device 71 stores the first common program information PAT and the first unique program information PMT that have been used until immediately before. The first tuner unit 3 Continues to extract the first bit stream 4, and the first demultiplexer unit 5 continues to extract the first program selected by the user immediately before (step 108a in FIG. 4). . However, in Embodiment 2 of the present invention, since only one decoder unit 6 is prepared, the extracted first program is discarded without being reproduced.

  Here, when the user transmits an instruction to select a new program different from the program currently being played back using the input device 10 (step 110b in FIG. 4), the arithmetic / control device 71 determines that the program is currently It is determined whether or not it is included in the same second bit stream 14 as the program being reproduced (step 111b in FIG. 4). If the program is included in the same second bit stream 14 as the program that is currently being played back, the process returns to step 105b, extracted by the second tuner unit 14 and the second demultiplexer unit 16, and stored in the program information storage. The program is extracted again based on the second common program information PAT stored in the unit 71d. If the program is not included in the same second bitstream 14 as the currently playing program, the arithmetic / control unit 71 then determines whether it is the program that was selected immediately before (step of FIG. 4). 113b).

  If the program selected by the user is not the first program reproduced immediately before, the process returns to Step 105a, and is extracted by the first tuner unit 3 and the first demultiplexer unit 5, and the program information storage unit 71d. The program is extracted from the first bit stream 4 based on the first common program information PAT stored in. In Embodiment 2 of the present invention, the external input signal 2 is composed of the first bit stream and the second bit stream, but when the external input signal 2 is composed of three or more bit streams, Returning to step 101a or step 101b, the extraction from the bitstream may be performed again.

  On the other hand, when the program selected by the user is the first program that has been reproduced immediately before, that is, the program that has been extracted by the first tuner unit 3 and the first demultiplexer unit 5, The unit 71c proceeds to step 108a, and transmits the first program extracted by the first tuner unit 3 and the first demultiplexer unit 5 to the decoder unit 6 to be played back via the control bus 8. Take control. While the reproduction of the first program is continued, the input command processing unit 71a in the arithmetic / control device 71 again monitors whether the user has transmitted a command to select a new program (FIG. 4). Step 110a).

  The program information storage unit 71d in the arithmetic / control device 71 stores the second common program information PAT and the second unique program information PMT that have been used until immediately before. The second tuner unit 14 Continues to extract the second bitstream 15, and the second demultiplexer unit 16 continues to extract the second program selected by the user immediately before. When the user selects the second program that has been played back immediately before, the same operation as described above is repeated.

  As described above, according to the invention of the second embodiment, when the user re-selects the program that has been played back immediately before, the time required to play back the program desired by the user can be shortened. . In actual use, since the frequency with which the user selects a program that re-selects the program that has been reproduced immediately before is relatively high, the operability of the digital broadcast receiving apparatus is improved.

Embodiment 3 FIG.
In Embodiment 1 or 2, the external input signal 2 is composed of two different digital bit streams, a first bit stream and a second bit stream. In other words, since the number of pairs of the tuner unit and the demultiplexer unit is prepared in advance equal to the number of bit streams constituting the external input signal 2, the operability of the digital broadcast receiving apparatus can be improved relatively easily.

  However, in actual digital satellite broadcasting or the like, the external input signal 2 is often composed of a larger number of bit streams. Here, for example, the external input signal 2 is composed of three different digital bit streams, the first, second, and third bit streams, and only two sets of tuner and demultiplexer units are prepared. Think about the case.

  FIG. 5 is a block diagram showing the configuration of the digital broadcast receiving apparatus 102 according to the second embodiment. The basic configuration is the same as that of the first or second embodiment, but the operation of the arithmetic / control apparatus is different. In the figure, 72 is an arithmetic / control device according to the third embodiment configured by a CPU and its peripheral devices, 72a monitors a command input by the user using the input device 10, receives the command, and displays its contents. An input command processing unit 72b for analyzing, a peripheral interface unit for controlling the first demultiplexer unit 5 and the like via the control bus 8 and receiving information from them via the control bus 8, 72c for analyzing and storing information 72d is a program information storage unit capable of storing and analyzing the contents of common program information and unique program information, and here is a part of the calculation / control unit 72c. It is configured as.

  FIG. 6 is a flowchart showing an operation and signal processing procedure of the digital broadcast receiving apparatus 102 according to the third embodiment. In the figure, steps 101a to 111a, 101b to 111b, and 101c to 111c perform the same operation as steps 101 to 111 in FIG. 15 of the conventional example. When the user selects the first program, the calculation / control device 72 first extracts the first bit stream 4 by the first tuner unit 3 and the first demultiplexer unit 5 (step of FIG. 6). 101a) After extracting and analyzing the first common program information PAT (steps 102a and 103a in FIG. 6), it is determined whether or not the first program is included in the first bitstream 4 (step in FIG. 6). 104a).

  If the first program is included in the first bitstream 4, the first unique program information PMT is extracted and analyzed based on the first common program information PAT (step 105a in FIG. 6) ( Steps 106a and 107a in FIG. Further, based on the first unique program information PMT, the first demultiplexer unit 5 and the decoder unit 6 extract and reproduce the first program (steps 108a and 109a in FIG. 6). Further, the input command processing unit 72a in the arithmetic / control device 72 monitors whether or not the user has selected a new program (step 110a in FIG. 6).

  While reproducing the first program, the second tuner section 14 and the second demultiplexer section 16 extract and analyze the second common program information PAT from the first bit stream 15 in advance. The information is stored in the program information storage unit 72d in the arithmetic / control device 72 (step 112a in FIG. 6).

  In addition, when the input command processing unit 72a in the arithmetic / control device 72 that monitors whether or not the user has transmitted a command for selecting a new program detects the command, a new program is currently being extracted. If it is included in the bit stream 4, the process returns to step 105a and the first unique program information is extracted and analyzed again (step 111a in FIG. 6).

  If the new program is not included in the currently extracted first bit stream 4, the new program is stored in the second bit stream 15 based on the previously extracted second common program information PAT. It is determined whether it is included (step 104b in FIG. 6). When the program is included in the second bit stream 15, the program is reproduced according to the same procedure as that for reproducing the first program (steps 105b to 109b in FIG. 6).

  When the new program is not included in the second bitstream 15, the arithmetic / control unit 72c in the arithmetic / control device 72 immediately starts extracting the third bitstream (step 101c in FIG. 6). The tuner and demultiplexer are controlled from the peripheral interface unit 72b via the control bus 8 so as to start extraction and analysis of the third common program information PAT (steps 102c and 103c in FIG. 6).

  For extraction of the third bit stream and extraction of the third common program information PAT, the first tuner unit 3 and the first demultiplexer unit 5 or the second tuner unit 14 and the second demultiplexer unit 16 Any set may be used. After extracting the third common program information, the arithmetic / control unit 72 determines whether the new program is included in the third bitstream. Thereafter, the same operation as described above is repeated until a stream including the program is found.

  As described above, in the third embodiment of the present invention, when a stream including a program to be selected next by a user can be predicted in advance, the time from selection of a program to playback is shortened. Is possible. On the other hand, when the stream including the program to be selected next by the user cannot be predicted, the effect cannot be obtained. However, in actual use of a digital broadcast receiver, there are many cases where a stream including a program to be selected next can be predicted in advance, such as when a program is forwarded, so that the operability of the digital broadcast receiver is improved overall. Can be made.

  In the third embodiment, before the user selects a new program, only the extraction of the predicted stream and the common program information is performed. However, when the program to be selected next by the user can be predicted. The operability of the digital broadcast receiving apparatus can be further improved by starting the extraction of the already predicted program before selecting a new program. In the third embodiment, only one program common information PAT included in one bit stream is extracted before the user selects a new program.

  Therefore, before the user selects a new program, a certain bit stream and common program information PAT included in the bit stream are extracted, and the extracted common program information PAT is stored in the program information storage unit 72b in the calculation / control device 72. Subsequently, the program common information PAT of a plurality of bit streams is stored by repeating a procedure such as extracting different bit streams and the program common information PAT included therein and storing the program common information PAT in the program information storage unit 72b. In addition, even if it is determined which bitstream contains the new program selected by the user based on the information, the time from when the user selects the program until playback is shortened. Therefore, it is possible to obtain a digital broadcast receiving apparatus or a received signal processing method with good operability.

Embodiment 4 FIG.
FIG. 7 is a block diagram showing a configuration of the digital broadcast receiving apparatus 103 according to the fourth embodiment. In the figure, reference numeral 73 denotes an arithmetic / control device according to the fourth embodiment constituted by a CPU and its peripheral devices, etc. The basic configuration is the same as that of the arithmetic / control devices of the first to third embodiments, but is different. Perform the operation.

  73 a is an input command processing unit that monitors a command input by the user using the input device 10, receives the command and analyzes the content, and 73 b controls the first demultiplexer unit 5 and the like via the control bus 8. Peripheral interface unit 73c that receives information from them via control bus 8, 73c is a calculation / control unit 73c that manages information analysis, storage, calculation, etc., and stores the contents of common program information and unique program information This is a program information storage unit that can be analyzed, and is configured here as a part of the calculation / control unit 73c. Reference numeral 17 denotes a decoder input switching device that selects one of the outputs of the first demultiplexer unit 5 and the second demultiplexer unit 16 as an input to the decoder unit 6. It is controlled by the device 73.

  Next, the operation will be described. FIG. 8 is a flowchart showing an example of the operation and signal processing procedure of the digital broadcast receiving apparatus according to the fourth embodiment. Steps 101a to 111a, 101b to 111b, and 101c to 111c perform the same operations as steps 101 to 111 in the conventional example of FIG. When the user selects the first program, the arithmetic / control device 73 first extracts the first bit stream 4 by the first tuner unit 3 and the first demultiplexer unit 5 (step of FIG. 8). 101a) After extracting and analyzing the first common program information PAT (steps 102a and 103a in FIG. 8), it is determined whether or not the first program is included in the first bitstream 4 (step in FIG. 8). 104a).

  If the first program is included in the first bitstream 4, the first unique program information PMT is extracted and analyzed based on the first common program information PAT (step 105a in FIG. 8) ( Steps 106a and 107a in FIG. Further, the first program is extracted by the first demultiplexer unit 5 and the decoder unit 6 based on the first unique program information PMT (step 108a in FIG. 8). The arithmetic / control device 73 controls the decoder input switching device 17 via the control bus 8 so that the first program is input to the decoder unit 6 after the extraction of the first program is started (see FIG. 8 step 114a).

  The decoder unit 6 reproduces the input first program as a video signal or an audio signal, and transmits it to the display device 9 for display (step 109a in FIG. 8). Further, the input command processing unit 73a in the arithmetic / control device 73 monitors whether the user has selected a new program (step 110a in FIG. 8).

  When the user transmits an instruction to reproduce the second program using the input device 10 during the reproduction of the first program, the calculation / control device 73 in the state where the reproduction of the first program is continued. First, the calculation / control unit 73c refers to the first program common information PAT and determines whether or not the second program is included in the same first bitstream 4 as the program currently being reproduced (FIG. 8). Step 111a).

  When not included in the same stream, the arithmetic / control unit 73c controls the second tuner unit 14 and the second demultiplexer unit 16 from the peripheral interface unit 73b via the control bus 8, and the second bit stream. 15 is extracted (step 101b in FIG. 8), and the second common program information PAT is further extracted (steps 102b and 103b in FIG. 8), and is the second program included in the second bitstream 15? Judgment is made (step 104b in FIG. 8).

  If the second program is included in the second bitstream 15, the calculation / control unit 73c uses the second common program information PAT (step 105b in FIG. 8) to generate the second unique program information. Control is performed to extract the PMT (steps 106b and 107b in FIG. 8). Further, the calculation / control unit 73c controls the second demultiplexer unit 16 to extract the second program based on the second unique program information PMT (step 108b in FIG. 8). The calculation / control unit 73c controls the decoder input switching device 17 from the peripheral interface 73b via the control bus 8 so that the second program is input to the decoder unit 6 after the extraction of the second program is started. (Step 114b in FIG. 8).

  As described above, the first program is input to the decoder unit 6 until the extraction of the second program is started, and the second program is input to the decoder unit 6 after the extraction of the second program is started. Thus, the first program can be provided to the user until the second program can be reproduced. Accordingly, since the blank time during the program extraction preparation period during which the program cannot be provided to the user can be eliminated, it is possible to obtain a digital broadcast receiving apparatus with good operability.

Embodiment 5. FIG.
FIG. 9 is a block diagram showing a configuration of digital broadcast receiving apparatus 104 according to the fifth embodiment. In the figure, reference numeral 74 denotes an arithmetic / control device according to the fifth embodiment, which includes a CPU and its peripheral devices. The basic configuration is the same as that of the arithmetic / control devices according to the first to fourth embodiments, but is different. Perform the operation.

  74 a is an input command processing unit that monitors a command input by the user using the input device 10, receives the command, and analyzes the content, and 74 b controls the first demultiplexer unit 5 and the like via the control bus 8. Peripheral interface unit 74c that receives information from them via control bus 8, 74c is a calculation / control unit 74c that manages information analysis, storage and calculation, etc., and stores the contents of common program information and unique program information This is a program information storage unit that can be analyzed, and is configured here as a part of the calculation / control unit 74c. 18 is a program information dedicated tuner section, 19 is a program information dedicated bit stream prepared in advance on the broadcasting station side, 20 is a program information dedicated demultiplexer section, and the output of the program information dedicated demultiplexer section 20 is a decoder. No input is made to part 6.

  Next, the operation will be described. FIG. 10 is a flowchart showing an example of an operation and signal processing procedure of the digital broadcast receiving apparatus according to the fifth embodiment. When the user selects the first program, the arithmetic / control device 74 receives a program selection command via the input command processing unit 74a (step 100 in FIG. 10). The arithmetic / control device 74 controls the tuner unit 18 dedicated to program information via the control bus 8 from the peripheral interface unit 74b, and extracts a bit stream dedicated to program information prepared in advance on the broadcasting station side of digital broadcasting ( Step 115 of FIG.

  Further, the arithmetic / control device 74 controls the demultiplexer unit 20 dedicated to program information from the peripheral interface unit 74b via the control bus 8, and extracts the program common information PAT corresponding to all bit streams (step of FIG. 10). 102). Since the bit stream 19 dedicated to program information is not used for transmitting program elements, it is possible to transmit program common information PAT having a sufficient amount of information. The calculation / control device 74 analyzes necessary information in the extracted program common information PAT and stores it in the program information storage unit 74d in the calculation / control unit 74c (step 116 in FIG. 10).

  Next, the arithmetic / control device 74 controls the first tuner unit 3 and the first demultiplexer unit 5 to extract the first bit stream 4 (step 101 in FIG. 10), and the program information storage unit 74d. The first unique program information PMT corresponding to the program selected by the user is extracted based on the common program information PAT stored in (Steps 105 and 106 in FIG. 10). Further, the first program element is extracted by the first demultiplexer unit 5 and the decoder unit 6 based on the first unique program information PMT (steps 107 and 108 in FIG. 10). The extracted program element is input to the decoder unit 6, reproduced as a video signal or an audio signal, transmitted to the display device 9, and displayed (step 109 in FIG. 10). Further, the input command processing unit 74a in the arithmetic / control device 74 monitors whether the user has selected a new program (step 110 in FIG. 10).

  When a command for selecting a new program by the user is transmitted from the input command processing unit 74a to the calculation / control device 74, the calculation / control device 74 stores the common program information PAT stored in the program information storage unit 74d. At the same time, extraction of a new program is started. When a new program is included in the same first bitstream 4, the unique program information PMT of the new program is extracted and re-executed.

  If a new program is not included in the same first bit stream 4, the new bit stream must be extracted again. However, since the extraction of the common program information PAT has already been completed, Can be shortened. As a result, according to the invention of the fifth embodiment, it is possible to reduce the time required from when the user selects a program until the program is actually reproduced, and the operability of the digital broadcast receiving apparatus is reduced. Can be improved.

  More specifically, factors that determine the time from when a user selects an arbitrary program until the program is actually played back include time required for bitstream tuning, demultiplexing such as header detection, etc. Time required to acquire two tables such as common program information and unique program information, and time required for decoding, etc. The most important of these is required to acquire two tables. It's time.

  Even if the transmission frequency of each program information table is 5 times per second, the worst acquisition time of about 400 milliseconds is required. However, it is possible to shorten the acquisition time of the table to about 200 milliseconds by omitting the acquisition time of the common program information, and it takes from the selection of the program to the reproduction even if other factors are taken into consideration. The time can be reduced to within about 500 milliseconds, and there is an effect that a digital broadcast receiving apparatus with good operability can be obtained in actual use.

  In the fifth embodiment, the common program information PAT is given in the bit stream 19 dedicated to program information and the unique program information PMT is given in the first bit stream 4, but the bit stream dedicated to program information is used. 19 may be configured to have both.

  Further, in the fifth embodiment, the extraction of the bitstream 19 dedicated to program information is started after the user first selects some program, but before the user first selects any program, for example, The extraction of the bit stream 19 dedicated to program information may be started immediately after the digital broadcast receiving apparatus is turned on.

  According to the digital broadcast receiving apparatus described above, a plurality of sets of a tuner unit and a demultiplexer unit are provided so that program information contained in a bit stream input to each tuner unit can be analyzed at the same time. When a program different from the program being played is selected, the desired program is extracted and played based on the program information analyzed in advance, so that the user can select another desired program while playing the program. Therefore, it is possible to shorten the time (time lag) required until the program is actually reproduced, and there is an effect that it is possible to provide a digital broadcast receiving apparatus with improved operability.

  A first tuner section for extracting a first bitstream including a first program group including at least one program and first program information for transmitting information related thereto; A first demultiplexer for extracting the first program group and the first program information from the bitstream of the first, and information on the second program group and the second program group composed of at least one program A second tuner for extracting a second bit stream including the second program information for transmitting the second program information, and a second tuner for extracting the second program group and the second program information from the second bit stream. A demultiplexer unit, a decoder unit that decodes the extracted first and second program groups to reproduce video or audio signals, and an input through which a user can transmit a command for selecting a desired program Equipment and extraction The first and second program information is analyzed simultaneously, and the user selects the second program in the second program group from the input device while playing the first program in the first program group. When the first program is reproduced, the second program is extracted based on the second program information analyzed in advance, and an arithmetic / control device for reproducing the second program is provided. It is possible to reduce the time required from when the second program is selected to when the second program is actually played back, and it is possible to provide a digital broadcast receiving apparatus with improved operability.

  The calculation / control apparatus controls the first tuner unit and the first demultiplexer unit or the second tuner unit and the second demultiplexer unit to control the first program information and the first program or the first program. The second program information and the second program are extracted, and the first tuner unit and the first demultiplexer unit or the second tuner unit and the second demultiplexer unit are reproduced in a state where video or audio is reproduced. Either one or both of the program information and the program related to the program that was being played back by the user was previously extracted by controlling a set that was not used, and the user was playing back from the input device immediately before. When an instruction to select a program again is transmitted, the program information and / or program information related to the program that was played back immediately before extraction are used and the program is played back immediately before. The program was extracted and played back, so that when the user re-selects the program that was playing immediately before, it is possible to shorten the time until playback and improve the operability. There is an effect that a digital broadcast receiving apparatus can be provided.

  In addition, the arithmetic / control device extracts the second program using the second program information extracted in advance, and plays back the first tuner unit and the first decoder while the second program is being reproduced. Since the third bit stream is extracted using the multiplexer unit, and the third program information and the third program are extracted, the next bit to be reproduced while a certain program is being reproduced. When a stream and a program can be predicted, by extracting the program information of the next predicted bit stream in advance, it is possible to quickly extract the next program, and a digital broadcast receiving device with improved operability is provided. There is an effect that it can be provided.

  In addition, an output signal from the first demultiplexer unit and the second demultiplexer unit is input, and a decoder input switching device for selecting one of the signals and outputting the selected signal to the decoder unit is provided. When the user transmits a command for selecting the second program in the second program group from the input device while the first program information and the first program in the first program are being reproduced. The second tuner unit and the second demultiplexer unit are used to extract the second program information and the second program and move to a reproducible state. Since the first program is continuously played back using the demultiplexer unit, it is possible to prevent the occurrence of blank time during which the program cannot be provided to the user when switching the program playback. Improved digital There is an effect that it provides a broadcast receiving apparatus.

  A first tuner unit that extracts a first bitstream including a program group including at least one program; a first demultiplexer unit that extracts a program group from the first bitstream; The second tuner unit that always extracts the second bit stream including the program information, the second demultiplexer unit that extracts the program information from the second bit stream, and the first demultiplexer unit A decoder unit that decodes a program group and reproduces a video or audio signal, an input device that allows a user to transmit a command for selecting a desired program, and an analysis of the extracted program information, and a program When a user selects a different program from the input device during playback, the selected program is extracted based on the program information that has been analyzed in advance and is played back. Since the operation / control device is provided, it is possible to quickly extract the program to be selected next by constantly extracting the program information from the second bit stream dedicated to program information transmission, and the operability is improved. There is an effect that a digital broadcast receiving apparatus can be provided.

  In addition, when receiving a digital broadcast signal program consisting of a plurality of bitstreams, a plurality of sets of tuner and demultiplexer units are used, and the program information contained in different bitstreams is analyzed simultaneously to allow the user to When a program is selected, the desired program is extracted based on the program information analyzed in advance, so that the program is actually played after the user selects another desired program during program playback. There is an effect that it is possible to shorten the time required for the operation.

  Also, when receiving a digital broadcast signal program composed of a plurality of bitstreams, a plurality of sets of tuner units and demultiplexer units are used, and at least one pair of tuner unit and demultiplexer unit is currently being reproduced and its program At the same time as extracting program information, at least one other pair of tuner and demultiplexer is used to extract the program that was playing immediately before, and the program that the user was playing back is selected again. In this case, since the program that was being played immediately before the extraction was played back, when the user selects the program that was played back immediately before, the time until playback can be shortened. effective.

  Further, when receiving a program of a digital broadcast signal composed of a plurality of bit streams, a plurality of sets of tuner units and demultiplexer units are used, and at least one set of tuner unit and demultiplexer unit is used to set the first program At the same time, a bit stream including any program that the user is expected to select next and its program information are analyzed using at least one other set of tuner and demultiplexer. When a desired program is selected, a program is extracted based on program information that has been analyzed and stored in advance, so that a bitstream and a program to be reproduced next are reproduced while a certain program is being reproduced. If the program information of the next predicted bitstream is extracted in advance, the next program can be quickly extracted. That there is an effect that it is.

  Further, when receiving a program of a digital broadcast signal composed of a plurality of bit streams, a plurality of sets of tuner units and demultiplexer units are used, and at least one set of tuner unit and demultiplexer unit is used to set the first program When the second program is selected and reproduced from the state where the program is being reproduced, the first program is continued until the second program is extracted and the second program can be reproduced. Since the reproduction is performed, there is an effect that it is possible to prevent the occurrence of a blank time during which the program cannot be provided to the user when the program reproduction is switched.

  Further, when receiving a program of a digital broadcast signal composed of a plurality of bit streams, a plurality of sets of tuner units and demultiplexer units are used, and at least one set of tuner units and demultiplexer units are used, and bits dedicated to program information are used. Since program information is always extracted from the stream, and a desired program is extracted using at least one other set of tuner and demultiplexer based on the program information, the second dedicated to program information transmission is extracted. By constantly extracting program information from the bit stream, there is an effect that the next selected program can be quickly extracted.

1 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to Embodiment 1. FIG. 3 is a flowchart showing an operation and signal processing procedure of the digital broadcast receiving apparatus according to the first embodiment. 6 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to Embodiment 2. FIG. 6 is a flowchart showing an operation and signal processing procedure of the digital broadcast receiving apparatus according to the second embodiment. 6 is a block diagram illustrating a configuration of a digital broadcast receiving apparatus according to Embodiment 3. FIG. 10 is a flowchart illustrating an operation and signal processing procedure of the digital broadcast receiving apparatus according to the third embodiment. FIG. 10 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a fourth embodiment. 10 is a flowchart showing an operation and signal processing procedure of the digital broadcast receiving apparatus according to the fourth embodiment. FIG. 10 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a fifth embodiment. 10 is a flowchart showing an operation and signal processing procedure of the digital broadcast receiving apparatus according to the fifth embodiment. It is a configuration block diagram of a conventional digital broadcast receiving apparatus. 1 is a bit stream structure diagram of an MPEG-2 system defined by ISO / IEC 13818-1. It is a structural diagram showing common program information of the MPEG-2 system defined by ISO / IEC13818-1. It is a structural diagram showing the specific program information of the MPEG-2 system defined by ISO / IEC13818-1. It is a flowchart which shows the procedure of the operation | movement and signal processing of the conventional digital broadcast receiver.

Explanation of symbols

1 Conventional digital broadcast receiver 2 External input signal (digital broadcast signal)
DESCRIPTION OF SYMBOLS 3 1st tuner part 4 1st bit stream 5 1st demultiplexer part 6 Decoder part 7 Conventional arithmetic / control apparatus 8 Control bus 9 Display apparatus 10 Input apparatus 11a Transport packet 11b PID
11c Payload 12a PAT table identifier 12b PAT broadcast program number identifier 12c PAT program map PID
13a PMT table identifier 13b PMT stream format identifier 13c PMT elementary PID
DESCRIPTION OF SYMBOLS 14 2nd tuner part 15 2nd bit stream 16 2nd demultiplexer part 17 Decoder input switching device 18 Tuner part only for program information 19 Bit stream only for program information 20 Demultiplexer part only for program information 70 Embodiment 1. Arithmetic / Control Device in Embodiment 71 71 Arithmetic / Control Device in Embodiment 2 72 Arithmetic / Control Device in Embodiment 3 73 Arithmetic / Control Device in Embodiment 4 74 Arithmetic / Control Device in Embodiment 5 100 Embodiment 1 Digital broadcast receiving apparatus according to Embodiment 101 Digital broadcast receiving apparatus according to Embodiment 2 102 Digital broadcast receiving apparatus according to Embodiment 3 103 Digital broadcast receiving apparatus according to Embodiment 4 104 Digital broadcast receiving apparatus according to Embodiment 5

Claims (2)

Digital broadcasting that includes a plurality of bitstreams, each bitstream including information of one or more programs, unique program information for specifying the programs, and common program information including information indicating the unique program information A digital broadcast receiving apparatus that receives a signal and reproduces a video of a desired program included in the plurality of bitstreams,
A first tuner unit for extracting a first bit stream from the digital broadcast signal;
A first demultiplexer for extracting information of a first program and first common program information from the first bitstream extracted in the first tuner;
A second tuner unit for extracting a second bit stream different from the first bit stream from the digital broadcast signal;
A second demultiplexer for extracting second program information and second common program information from the second bitstream extracted in the second tuner unit;
A decoder unit that reproduces video of either the first program or the second program based on the information of the first program or the information of the second program;
The second demultiplexer unit corresponds to the second demultiplexer unit while the decoder unit is playing back the video of the program extracted by the first demultiplexer unit. The second common program information included in the bitstream is extracted, the extracted second common program information is stored in storage means, and the storage is performed while the decoder unit reproduces the video of the program. A digital broadcast receiving apparatus, wherein the unique program information is extracted based on the second common program information stored in the means. Digital broadcasting comprising a plurality of bitstreams, each bitstream including information of one or more programs, unique program information for specifying the programs, and common program information including information indicating the unique program information A digital broadcast receiving method for receiving a signal and reproducing a video of a desired program included in the plurality of bit streams,
Extracting a first bitstream from the plurality of bitstreams by a first stream extraction means;
From the first bit stream, the information of the first program, or the first common program information is extracted by the first information extraction means,
During playback of the video of the first program, a second bit stream different from the first bit stream is extracted from the plurality of bit streams by a second stream extraction unit;
Second common program information is extracted from the second bitstream by second information extraction means;
Playing back the video of the first program or the video of the second program,
The second information extraction unit is included in the second bit stream corresponding to the second information extraction unit while the video of the program extracted by the first information extraction unit is being reproduced. While extracting the second common program information, storing the extracted second common program information in a storage means, and while the video of the program extracted by the first information extraction means is being reproduced, A digital broadcast reception signal processing method, wherein the unique program information is extracted based on the second common program information stored in the storage means.

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