JP4896600B2 - Digital broadcast receiving apparatus and channel selection processing method thereof - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus that receives a digital broadcast signal, and in particular, a digital that converts a transfer rate of program data input in a transport stream (TS) format defined by the MPEG standard to a low rate. The present invention relates to a broadcast receiving apparatus.

  In recent years, digital television broadcasting that is directly transmitted from a broadcasting station or transmitted via a broadcasting satellite, a communication satellite, a terrestrial relay station, or the like has been put into practical use. The broadcast signal is a transport stream in which additional information such as video information, audio information, and program information (program sequence information SI / program specific information PSI) is multiplexed using a method prescribed by the MPEG standard on the broadcast station side. , Digitally modulated and transmitted.

  A digital broadcast receiving apparatus that receives the digital broadcast is configured to separate and reproduce video, audio, and program information from a transport stream obtained by demodulating the received television broadcast signal.

  In digital broadcasting, more channels can be transmitted than in analog broadcasting, so the range of channel selection has expanded for users. With the increase in the number of digital broadcasting channels, there is a growing need for simultaneous display or simultaneous recording of a plurality of channels. In this case, it is necessary to simultaneously acquire a plurality of program data.

  In a conventional general digital broadcast receiving apparatus, since there is one tuner / demodulation unit and one demultiplexer unit, only a single program TS can be processed, and a plurality of program data is acquired simultaneously. I couldn't.

  In order to solve this problem, there is known a digital broadcast receiving apparatus in which a plurality of sets of tuners / demodulators and demultiplexers are mounted so that desired program data can be simultaneously acquired from TSs of different programs of a plurality of systems. (For example, refer to Patent Document 1).

JP 2002-185901 A

However, when a plurality of sets of tuner / demodulation units and demultiplexer units are implemented as in Patent Document 1, and program data of different programs of a plurality of systems are acquired simultaneously, when the program data is demodulated / decoded, etc. The processing load of an arithmetic element (microprocessor or the like) that performs various determinations and processes such as descrambling also doubles as the number of systems increases.
In particular, in CS broadcasting, since the transfer rate of program data is high, the processing load on the arithmetic element increases when program data of different programs of a plurality of systems are acquired simultaneously. In addition, for example, at the time of channel selection processing of a digital broadcast receiving device, it is necessary to obtain and determine various information from additional information such as program information (program sequence information SI / program specific information PSI), Processing load increases.

  When a high-performance (high processing capacity) arithmetic element is used with an increase in processing load, the cost increase due to the high-performance arithmetic element is very large, and the cost of the digital broadcast receiving apparatus is significantly increased. become. In addition, when a plurality of tuner / demodulation units and demultiplexer units are mounted as in Patent Document 1, the cost increase is large, and the cost increase of a high-performance arithmetic element can be suppressed as much as possible. Is desired.

For example, if low-cost computing elements that do not have high processing capacity are used to suppress such an increase in cost, program data acquisition fails and program playback abnormalities or recording abnormalities occur. In such a case, the reliability of the digital broadcast receiving apparatus is lowered. Also, for the demultiplexer unit, it is possible to consolidate multiple systems every few and change them to low-cost elements with low processing capacity. There is a possibility that a reproduction abnormality or a recording abnormality may occur, and in that case, the reliability is also lowered.
Therefore, it is necessary to use a high-performance and high-cost element when simultaneously obtaining desired program data from TSs of different programs in a plurality of systems without sacrificing reliability as a digital broadcast receiver. In that case, there is a problem that the digital broadcast receiving apparatus becomes very expensive in the end.

  In order to solve the above-described problems, the present invention can simultaneously acquire desired program data from TSs of different programs in a plurality of systems without using a high-performance and high-cost element without impairing reliability. An object is to provide a digital broadcast receiving apparatus.

The digital broadcast receiver of the present invention is
A tuner / demodulator that outputs a transport stream (TS) defined in the MPEG standard by receiving and demodulating a digital broadcast signal;
At least at the time of channel selection processing, a packet designated by a packet identifier (PID) stored in advance is selected from the demodulated TS, and a TS that is output by reducing the transfer rate of the TS including only the selected packet. A transfer rate converter,
A demultiplexer unit that separates TS output from the TS transfer rate conversion unit in units of packets, and outputs them to different output destinations according to the type of each packet;
While controlling the entire apparatus including each unit, analyzing at least the program specific information (PSI) packet separated by the demultiplexer unit, and detecting the PID from the packet information specified in the packet, A control unit for sending the PID to the TS transfer rate conversion unit;
A selection PID storage unit for storing a PID for designating a packet selected by the TS transfer rate conversion unit;
And a PID management unit that stores the PID detected by the control unit in the selected PID storage unit.

Further, the channel selection processing method of the digital broadcast receiving apparatus of the present invention is:
A process of always storing a fixed value PID in advance before starting the tuning process;
During the tuning process,
Using a constantly fixed value PID to extract only a permanently fixed PID packet including at least a program association table (PAT) packet in the PSI;
A step of outputting the TS of only the packet of the constantly fixed PID while reducing the transfer rate;
The method includes a step of separating and outputting a packet including a PAT from a TS of only the packet of the constantly fixed PID.

  The present invention sorts a packet designated by a pre-stored PID at the time of channel selection processing from the demodulated TS, and outputs the transmission rate of the TS including only the sorted packet at a low rate, for example, A TS including packets necessary for demultiplexer processing at each point of time such as channel selection processing can be output to the demultiplexer at a low rate, and therefore the processing amount of the arithmetic element can be reduced. Therefore, in the present invention, desired program data can be simultaneously acquired from TSs of different programs in a plurality of systems without impairing reliability without using high-performance elements with high costs.

Embodiment 1. FIG.
FIG. 1 is a block diagram of a digital broadcast receiving apparatus according to Embodiment 1 of the present invention apparatus.
In FIG. 1, an antenna 1 transmits a digital television broadcast signal (digital broadcast signal) transmitted directly from a broadcast station (not shown) or transmitted via a broadcast satellite, a communication satellite, or a terrestrial relay station. Receive. In the broadcasting station, as described above, a transport stream in which additional information such as video information, audio information, and program information (program arrangement information SI / program identification information PSI) is multiplexed using a method defined in the MPEG standard. Is digitally modulated and transmitted.

  The tuner / demodulator 2 demodulates the digital broadcast signal received by the antenna 1 to output a transport stream (TS) defined by the MPEG standard.

  The TS transfer rate conversion unit 3 selects a packet designated by a pre-stored packet identifier (PID) from the TS demodulated and output by the tuner / demodulation unit 2 at the time of channel selection processing. The transfer rate of TS including only packets is reduced and output.

  The TS transfer rate conversion unit 3 transfers a TS including at least a program association table (PAT) packet in the PSI to the demultiplexer unit 4 in the first channel selection process, and in the second channel selection process, The TS including at least the PMT packet in the PSI is transferred to the demultiplexer unit 4, and at least the TS including the detected program data packet is transferred to the demultiplexer unit 4 in the third channel selection process. In the second channel selection process, packets including the PMT are separated and output. In the third channel selection process, program data packets are separated and output.

FIG. 2 is a block diagram showing a schematic internal configuration of the TS transfer rate conversion unit 3 shown in FIG. FIGS. 3A and 3B are diagrams illustrating examples of TS in the TS transfer rate conversion unit 3.
Inside the TS transfer rate conversion unit 3, when the TS demodulated by the tuner / demodulation unit 2 is input to the packet filter unit 101, the packet of the PID stored (registered) in the selected PID storage unit 104 in advance is received. Extracted and output to the packet storage / transfer control unit 102.
As a result, since the packet filter unit 101 excludes the program data other than the program to be viewed from the TS input to the TS transfer rate conversion unit 3 and outputs it, the packet filter unit 101 outputs it to the packet storage / transfer control unit 102. In the TS to be processed, the packet portion of the excluded program data is free as an interval. The TS output in this case is, for example, as shown in FIG.

The packet storage / transfer control unit 102 sequentially accumulates (temporarily stores) input TS packets (188 bytes) at a normal transfer rate (bit rate) in a transfer packet storage unit 103 configured like a ring buffer, for example. Let For example, when the TS of FIG. 3A is input, the accumulated TS is accumulated as shown in FIG. 3B. When the first packet PAT (1) in FIG. 3A is written in the transfer packet storage unit 103, the written packet PAT (1) is read out and transferred to the demultiplexer unit (4). Since the transfer rate at the time of reading the packet PAT (1) is set slower than the transfer rate at the time of writing, the transfer rate (bit rate) of the TS output to the demultiplexer unit (4) can be reduced. . Further, the packets following the first packet PAT (1) are also transferred in order when the writing is completed.

  The transfer packet storage unit 103 stores a TS including only the packets selected by the packet filter unit 101. Further, since the number of packets is limited by selecting packets by the packet filter unit 101, it is possible to avoid the problem that the transfer packet storage unit 103 overflows as a data buffer of TS (packets). That is, the process of the packet filter unit 101 can prevent the packet writing process in the transfer packet storage unit 103 from overtaking the packet transfer process.

  The selected PID storage unit 104 stores a PID for designating a packet selected by the packet filter unit 101 of the TS transfer rate conversion unit 3.

  The demultiplexer unit 4 separates the TS output from the TS transfer rate conversion unit 3 in units of packets for each program data, and outputs them to different output destinations corresponding to the types of packets. The demultiplexer unit 4 outputs MPEG video data defined in the MPEG standard to MPEG video data, and outputs MPEG audio data to the MPEG audio decoder unit 7.

  The demultiplexer unit 4 separates and outputs the packet including the PAT in the first channel selection process, and outputs the packet including the PMT in the second channel selection process. Then, the program data packets are separated and output.

  The control unit 5 is, for example, an arithmetic element such as a microprocessor, and controls the entire device including each unit in the digital broadcast receiving device, and analyzes the program specific information (PSI) packet separated by the demultiplexer unit 4. Then, the PID is detected from the information of the packet specified in the packet, and the detected PID is sent to the TS transfer rate conversion unit 3.

  In the first stage of channel selection processing, the control unit 5 analyzes the packet including the PAT separated by the demultiplexer unit 4 to detect the PID of the packet in the program map table (PMT), and in the second stage of channel selection processing. The PMT packet separated by the demultiplexer unit 4 is analyzed to detect the PID of the program data packet, and the PID is sent to the TS transfer rate conversion unit 3.

  Inside the control unit 5, the PID management unit 11 stores the fixed PID stored in the fixed PID storage unit 12 in the fixed PID storage unit 104 in the selection PID storage unit 104 in the first stage of the channel selection process. In the second stage, the PID of the PMT packet detected by the control unit 5 is stored in the selected PID storage unit 104. In the third channel selection process, the PID of the detected program data packet is stored in the selected PID storage unit 104. Remember.

The PID detected by the control unit 5 is stored in the selected PID storage unit 104 described later.
The fixed PID storage unit 12 stores in advance a constant fixed value PID that the PID management unit 11 stores in the selected PID storage unit 104 at the start of channel selection.

FIG. 4 is a flowchart showing a channel selection process of the digital broadcast receiving apparatus of FIG.
Next, channel selection processing according to the first embodiment will be described with reference to FIG.
Before starting the {Z1} channel selection process, the fixed PID storage unit 12 always stores a fixed value PID in advance.

  When channel selection processing is started by a user's channel selection instruction input or the like, the {Z2} PID management unit 11 clears the PID registered in the selected PID storage unit 104 for use in the previous channel selection processing or the like. Then, the tuner of the tuner / demodulator 2 is set so that the station of the program intended for reception can be selected (S2).

  When the tuner setting is completed, as the first stage of {A} channel selection processing, the {A1} PID management unit 11 stores the PID having a fixed value stored in advance in the fixed PID storage unit 12 in the selection PID storage unit 104. Store (S3). The PID having a fixed value is a PID of a section table having a fixed PID regardless of the program to be selected, for example, PAT, CAT, NIT, or the like.

  Then, the {A2} TS transfer rate conversion unit 3 (packet filter unit 101) extracts only the constantly fixed PID packet based on the stored contents of the selected PID storage unit 104 (S4). In this case, the always-fixed PID includes at least a program association table (PAT) packet in the PSI.

  Further, the {A3} TS transfer rate conversion unit 3 (packet storage / transfer control unit 102) reduces the transfer rate and outputs to the demultiplexer unit 4 a TS that includes only a fixed PID packet at all times (S5). .

  FIG. 5 is a diagram showing packets included in the TS at the time of channel selection processing of the digital broadcast receiving device of FIG. 1, and FIG. 5A shows a packet of a constantly fixed PID transferred to the demultiplexer unit 4 in step S5. It is a figure which shows TS containing only.

  The TS of FIG. 5A includes only a section table having a fixed value PID, for example, PAT, CAT, NIT, etc., but it does not always have a fixed value PID. Packets are not included. Note that the program data is, for example, data such as video, audio, subtitles, text super, data broadcasting, and the like.

  In the {A4} demultiplexer unit 4 to which the TS including only the constantly fixed PID packet is input, the packet including the PAT is separated from the TS including only the always fixed PID packet and output to the control unit 5 (S6).

  The {A5} control unit 5 to which the packet including the PAT is input analyzes the content of the packet including the PAT and detects the PID of the packet in the program map table (PMT) (S7).

  {B} As the second stage of the channel selection process, the {B1} PID management unit 11 additionally stores the PID of the detected PMT packet in the selected PID storage unit 104 (S8).

  Then, the {B2} TS transfer rate conversion unit 3 (packet filter unit 101) additionally extracts the PMT packet in the PSI based on the PID of the PMT packet stored in the selected PID storage unit 104 (S9).

  Further, the {B3} TS transfer rate conversion unit 3 (packet storage / transfer control unit 102) outputs a TS including a PMT packet in addition to a fixed PID packet to the demultiplexer unit 4 while reducing the transfer rate. (S10).

FIG. 5B is a diagram illustrating a TS including a constantly fixed PID packet and a PMT packet transferred to the demultiplexer unit 4 in step S10.
The TS of FIG. 5B includes a section table packet (for example, PAT, CAT, NIT, etc.) having a fixed value PID and a PMT packet. No program data packets are included.

  In the {B4} demultiplexer unit 4 to which the TS including the PMT packet is input, the PMT packet is separated from the TS including the PMT packet and output (S11).

  The {B5} control unit 5 to which the packet including the PMT is input analyzes the PMT packet separated by the demultiplexer unit 4 and detects the PID of the program data packet (S12).

  As the third stage of the {C} channel selection process, the {C1} PID management unit 11 additionally stores the PID of the detected program data packet in the selected PID storage unit 104 (S13).

  Then, the {C2} TS transfer rate conversion unit 3 (packet filter unit 101) also extracts the program data packet based on the detected PID of the program data packet (S14).

  Further, the {C3} TS transfer rate conversion unit 3 (packet storage / transfer control unit 102) reduces the transfer rate of a TS including a program data packet in addition to a fixed PID packet and a PMT packet at all times. The data is output to the multiplexer unit 4 (S15).

FIG. 5C is a diagram illustrating a TS including a constantly fixed PID packet, a PMT packet, and a program data packet transferred to the demultiplexer unit 4 in step S15.
5C includes a packet of a section table (for example, PAT, CAT, NIT, etc.) having a fixed PID, a PMT, and a program data packet. At this time, a TS including all program data constituting the program is input to the demultiplexer unit 4.

  In the {C4} demultiplexer unit 4 to which a packet including program data is input, the program data packet is separated into a video packet and an audio packet and output to the MPEG video decoder unit 6 and the MPEG audio decoder unit 7. The MPEG video decoder 6 decodes the video data and outputs a video signal, and the MPEG audio decoder 7 decodes the audio data and outputs an audio signal (S16).

  As described above, in the digital broadcast receiving apparatus according to the present embodiment, as described above, the TS transfer rate conversion unit 3 selects the packet designated by the pre-stored PID from the demodulated TS, and selects the selected packet. By reducing and outputting the transfer rate of the TS including only the packet, it is possible to reduce the transfer rate of the TS including the packet necessary for the demultiplexer process at each time point such as the channel selection process.

  Thereby, in the digital broadcast receiving apparatus according to the present embodiment, for example, when desired program data is simultaneously acquired from a plurality of different TSs, the control unit 5 (microprocessor), demultiplexer unit 4 and the like during the channel selection process The processing amount (processing load) of the computing element can be reduced (reduced), and even without using a high-performance element with high cost, the desired program can be selected from TSs of different programs in a plurality of systems without impairing reliability. Data can be acquired simultaneously.

Embodiment 2. FIG.
In the first embodiment described above, at the start of the channel selection process, the PID management unit 11 clears all the PIDs registered in the selected PID storage unit 104 in step S1. However, since a fixed value PID is always required at any stage of the channel selection processing, the fixed value PID is stored in the selected PID storage unit 104 immediately in step S3. Therefore, in the second embodiment described below, the fixed PID is always stored in the selected PID storage unit 104 so as not to be erased, and the PID registered in the selected PID storage unit 104 is cleared at the start of the channel selection process. In this case, a description will be given of a case where only the other fixed PIDs are erased without always erasing the fixed PIDs.

FIG. 6 is a block diagram of a digital broadcast receiving apparatus according to Embodiment 2 of the present invention apparatus.
The main difference between the first embodiment shown in FIG. 1 and the present embodiment shown in FIG. 6 is that the processing contents of the TS transfer rate conversion unit 3a and the PID management unit 11a in the control unit 5a are different. The point is that the fixed PID storage unit 12 in the control unit 5a is deleted. In the following description, only the differences are described, and the other configurations are the same as those in the first embodiment, and thus description thereof is omitted.

Differences in the TS transfer rate conversion unit 3a will be described later with reference to FIG.
Inside the control unit 5a, a fixed value PID is always stored in the selected PID storage unit 104a in advance before the channel selection process, and in the first stage of the channel selection process, the PID management unit 11a displays the selected PID storage unit. The PID having a fixed value stored in 104a is used. Since the subsequent processing is the same as that of the first embodiment, description thereof is omitted.

  That is, the PID having a constant value stored in the fixed PID storage unit 12 in the first embodiment is stored in advance in the selected PID storage unit 104 in the present embodiment, and is selected by the PID management unit 11 at the start of channel selection. A PID having a constant value stored in advance in the PID storage unit 104 is read and used. Other processes are the same as those in the first embodiment.

FIG. 7 is a block diagram showing a schematic internal configuration of the TS transfer rate conversion unit 3a shown in FIG.
The main difference between the TS transfer rate conversion unit 3 of the first embodiment shown in FIG. 2 and the TS transfer rate conversion unit 3a of the present embodiment shown in FIG. 6 is the processing of the selected PID storage unit 104a. The content is different.

  The selection PID storage unit 104a basically stores a PID for designating a packet selected by the packet filter unit 101 of the TS transfer rate conversion unit 3 as in the first embodiment. In addition, a fixed PID is always stored in advance so that it cannot be erased. In order to always store a fixed PID in the selected PID storage unit 104 regardless of the channel selection target program, for example, the PID management unit 11 may be used, but other means may be used.

  As for the method of storing the fixed PID in the selected PID storage unit 104a so that the fixed value PID cannot be erased, it is possible to read only in a partial area of any writable storage element and not write (erase). Alternatively, a region where writing (erasing) is impossible may be configured as another memory element. Similar to the one described in the first embodiment, the always-fixed PID is a section table having a fixed PID regardless of the program to be selected, for example, a PID such as PAT, CAT, or NIT.

FIG. 8 is a flowchart showing a channel selection process of the digital broadcast receiving apparatus of FIG.
The main difference between the flowchart of the tuning process of the first embodiment shown in FIG. 4 and the flowchart of the tuning process of the present embodiment shown in FIG. 8 is that the step S1a in FIG. The PID stored in the selected PID storage unit 104a except for the value PID is cleared, and in step S3a, the constantly fixed value PID stored in the selected PID storage unit 104a is used, and a new always fixed value is used. The PID is not stored.

  In the present embodiment, as described above, since the fixed PID is stored (registered) in the selected PID storage unit 104 so that it cannot be erased, the process of registering the fixed PID at the start of the channel selection process is performed. It can be omitted. Therefore, in addition to the effects of the first embodiment, the processing amount of the control unit 5a (microprocessor) can be further reduced (processing load can be reduced), so that an element with lower cost can be obtained without impairing reliability. Can be used.

  The present invention can be applied to all receivers that are installed in homes and offices, mounted on mobile objects such as cars, and portable receivers, as long as they are television receivers incorporating digital broadcast tuners. Further, the present invention can be applied to a recording apparatus such as a DVD recorder incorporating a digital broadcast tuner.

It is a block diagram of the digital broadcast receiver in Embodiment 1 of this invention apparatus. FIG. 2 is a block diagram showing a schematic internal configuration of a TS transfer rate conversion unit 3 shown in FIG. 1. (A), (b) is a figure which shows the example of TS in TS transfer rate conversion part 3. FIG. 3 is a flowchart showing a channel selection process of the digital broadcast receiving apparatus of FIG. 1. It is a figure which shows the packet contained in TS at the time of the channel selection process of the digital broadcast receiver of FIG. 1, (a) includes only the packet of the always fixed PID transferred to the demultiplexer unit 4 in step S5 of FIG. 5B is a diagram illustrating a TS, and FIG. 4B is a diagram illustrating a TS including a constantly fixed PID packet and a PMT packet transferred to the demultiplexer unit 4 in step S10 of FIG. 4, and FIG. It is a figure which shows TS containing the packet of the always fixed PID, the packet of PMT, and the packet of program data transferred to the demultiplexer part 4 by step S15. It is a block diagram of the digital broadcast receiver in Embodiment 2 of this invention apparatus. FIG. 7 is a block diagram showing a schematic internal configuration of a TS transfer rate conversion unit 3a shown in FIG. It is a flowchart which shows the channel selection process of the digital broadcast receiver of FIG.

Explanation of symbols

1 antenna, 2 tuner / demodulator, 3, 3a TS transfer rate converter, 4 demultiplexer, 5, 5a controller, 6 MPEG video decoder, 7 MPEG audio decoder, 11, 11a PID manager, 12 fixed PID storage unit, 101 packet filter unit, 102 packet storage / transfer control unit, 103 transfer packet storage unit, 104, 104a selection PID storage unit.

Claims (12)

A tuner / demodulator that outputs a transport stream (TS) defined in the MPEG standard by receiving and demodulating a digital broadcast signal;
At least at the time of channel selection processing, a packet designated by a packet identifier (PID) stored in advance is selected from the demodulated TS, and a TS including only the selected packet is selected as a TS including only the selected packet. The transfer rate of the demodulated TS , and a TS transfer rate conversion unit that outputs the reduced transfer rate,
A demultiplexer unit that separates TS output from the TS transfer rate conversion unit in units of packets, and outputs them to different output destinations according to the type of each packet;
While controlling the entire apparatus including each unit, analyzing at least the program specific information (PSI) packet separated by the demultiplexer unit, and detecting the PID from the packet information specified in the packet, A control unit for sending the PID to the TS transfer rate conversion unit;
A selection PID storage unit for storing a PID for designating a packet selected by the TS transfer rate conversion unit;
A digital broadcast receiving apparatus comprising: a PID management unit that stores the PID detected by the control unit in the selected PID storage unit. In the TS transfer rate conversion unit,
A packet filter unit for selecting a packet designated by a PID stored in advance from the demodulated TS;
A transfer packet storage unit for storing a TS including only the selected packets;
A packet storage / transfer control unit that temporarily stores the TS including only the selected packets in the transfer packet storage unit at a normal transfer rate, and sequentially outputs the stored packets at a rate slower than the normal transfer rate. The digital broadcast receiver according to claim 1. The digital broadcast receiving apparatus according to claim 2, further comprising a fixed PID storage unit that stores in advance a PID having a fixed value that is always stored in the selected PID storage unit by the PID management unit at the start of channel selection. (A) In the first stage of channel selection processing,
The PID management unit causes the selection PID storage unit to store a PID having a fixed value stored in advance in the fixed PID storage unit,
The TS transfer rate conversion unit extracts only a constantly fixed PID packet including at least a program association table (PAT) packet in the PSI, and reduces a TS transfer rate of only the constantly fixed PID packet. Output to the demultiplexer unit,
The demultiplexer unit separates a packet containing a PAT from a TS of only the fixed PID packet and outputs the packet to the control unit,
The controller analyzes the packet including the PAT and detects the PID of the packet in the program map table (PMT),
(B) In the second stage of the tuning process,
The PID management unit additionally stores the PID of the detected PMT packet in the selected PID storage unit,
The TS transfer rate conversion unit extracts the PMT packet in the PSI based on the PID of the PMT packet, and reduces the transfer rate of the TS including the PMT packet in addition to the constantly fixed PID packet. Transfer to the demultiplexer
The demultiplexer unit separates and outputs the PMT packet from the TS including the PMT packet,
The control unit analyzes the PMT packet separated by the demultiplexer unit to detect a PID of a packet of program data,
(C) In the third stage of channel selection processing,
The PID management unit additionally stores the PID of the detected program data packet in the selected PID storage unit,
The TS transfer rate conversion unit extracts the program data packet based on the PID of the detected program data packet, and includes the program data packet in addition to the constantly fixed PID packet and the PMT packet. Reduce the transfer rate of TS and transfer to the demultiplexer,
The digital broadcast receiving apparatus according to claim 3, wherein the demultiplexer unit outputs the program data packet by separating the packet into a video packet and an audio packet. The digital broadcast receiving apparatus according to claim 2, wherein a fixed PID is always stored in the selected PID storage unit in a non-erasable manner. (A) In the first stage of channel selection processing,
The PID management unit uses a constantly fixed value PID stored in advance in the selected PID storage unit,
The TS transfer rate conversion unit extracts only a fixed PID packet that includes at least a PAT packet in the PSI, reduces the TS transfer rate of only the fixed PID packet, and outputs it to the demultiplexer unit And
The demultiplexer unit separates a packet containing a PAT from a TS of only the fixed PID packet and outputs the packet to the control unit,
The control unit detects a PID of a PMT packet by analyzing a packet including the PAT,
(B) In the second stage of the tuning process,
The PID management unit additionally stores the PID of the detected PMT packet in the selected PID storage unit,
The TS transfer rate conversion unit extracts the PMT packet in the PSI based on the PID of the PMT packet, and reduces the transfer rate of the TS including the PMT packet in addition to the constantly fixed PID packet. Transfer to the demultiplexer
The demultiplexer unit separates and outputs the PMT packet from the TS including the PMT packet,
The control unit analyzes the PMT packet separated by the demultiplexer unit to detect a PID of a packet of program data,
(C) In the third stage of channel selection processing,
The PID management unit additionally stores the PID of the detected program data packet in the selected PID storage unit,
The TS transfer rate conversion unit extracts the program data packet based on the PID of the detected program data packet, and includes the program data packet in addition to the constantly fixed PID packet and the PMT packet. Reduce the transfer rate of TS and transfer to the demultiplexer,
The digital broadcast receiving apparatus according to claim 5, wherein the demultiplexer unit outputs the program data packet by separating the packet into a video packet and an audio packet. A process of always storing a fixed value PID in advance before starting the tuning process;
Outputting a transport stream (TS) defined in the MPEG standard by receiving and demodulating a digital broadcast signal;
During the tuning process,
Using a constantly fixed value PID to extract only a permanently fixed PID packet including at least a program association table (PAT) packet in the PSI;
And characterized in that the TS only packets of the constantly fixed PID, said transfer rate of the TS of only packets always fixed PID is lower than the transfer rate of the demodulated TS, and a step of outputting, at least A channel selection processing method for a digital broadcast receiving apparatus. During the tuning process,
The channel selection processing method for a digital broadcast receiving apparatus according to claim 7, further comprising a step of first clearing the PID stored in the selected PID storage unit. A step of storing a fixed value PID in advance so that it cannot be erased before starting the tuning process;
Outputting a transport stream (TS) defined in the MPEG standard by receiving and demodulating a digital broadcast signal;
During the tuning process,
A step of reading a constantly fixed value PID stored in advance in the selected PID storage unit;
Using a constantly fixed value PID to extract only a permanently fixed PID packet including at least a program association table (PAT) packet in the PSI;
And characterized in that the TS only packets of the constantly fixed PID, said transfer rate of the TS of only packets always fixed PID is lower than the transfer rate of the demodulated TS, and a step of outputting, at least A channel selection processing method for a digital broadcast receiving apparatus. During the tuning process,
10. The channel selection processing method for a digital broadcast receiving apparatus according to claim 9, further comprising a step of first clearing PIDs stored in a selected PID storage unit excluding a fixed value PID. Separating and outputting a packet containing a PAT from a TS of only the fixed PID packet; and
Analyzing a packet including the PAT to detect a PID of a packet of a program map table (PMT);
Additionally storing the PID of the detected PMT packet in the selected PID storage unit;
Extracting a PMT packet in the PSI based on the PID of the PMT packet;
The TS including the PMT packet in addition to the always-fixed PID packet is reduced, and the transfer rate of the TS including the PMT packet in addition to the always-fixed PID packet is made lower than the transfer rate of the demodulated TS. Te, channel selection processing method for a digital broadcast receiving apparatus according to any one of claims 7 to 10, characterized by further comprising an output to process. Separating and outputting the PMT packet from the TS including the PMT packet;
Analyzing the separated PMT packet to detect the PID of the program data packet;
Additionally storing a PID of the detected program data packet;
Extracting the program data packet by the PID of the detected program data packet;
The transmission rate of the TS including the program data packet in addition to the constantly fixed PID packet and the PMT packet, and the transfer rate of the TS including the program data packet in addition to the always fixed PID packet and the PMT packet. Reducing the output rate of the demodulated TS and outputting it;
12. The channel selection processing method of the digital broadcast receiving apparatus according to claim 11, further comprising a step of separating the program data packet into a video packet and an audio packet and outputting the packet.

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