JP2004040492A - Multichannel reproducing apparatus, digital broadcast receiver, method for reproducing multichannel, program for reproducing multichannel, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the versatility of a possible system configuration in a digital broadcast receiver by simultaneously receiving a plurality of streams of a plurality of multiplexing systems, performing multichannel reproduction, and more reducing a circuit scale. <P>SOLUTION: A transport decoder 108 simultaneously receives the plurality of streams of the plurality of multiplexing systems for processing. A format transformation section 109 extracts the PES/ES of video.audio from each of the multiplexing system streams and is arranged at the pay load section of an MPEG-2 transport stream packet and adjusts a packet size to 188 bytes by using 4 header bytes and an adaptation field. A packet identifier change section 110 changes a packet identifier so that the packet identifier of the MPEG-2 transport stream packet may not be overlapped. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multi-channel reproduction technique for simultaneously acquiring and reproducing a plurality of streams of a plurality of multiplexing schemes.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, video, audio, and the like are coded, packetized, and multiplexed by various multiplexing methods specified by a DVB (Digital Video Broadcasting) standard, a DSS (Digital Satellite System) standard, a DVD (Digital Versatile Disc) standard, and the like. The multiplexed data stream is provided to the user by digital broadcasting or the like or stored in a recording medium, and the user reproduces video and audio by a reproducing apparatus corresponding to each multiplexing method.
[0003]
According to Japanese Patent Application Laid-Open No. 2001-308921, the control unit generates a control signal for controlling each unit based on microcode sequentially read from the instruction memory. The input packet is stored in a shift register, the header of the packet is taken into a group of registers as necessary, analyzed by an operation unit, and an output destination is determined by an output destination determination unit based on the packet ID in the header. The separation unit separates an arbitrary packet from the output of the shift register and outputs the packet to a predetermined output destination according to the calculation result of the calculation unit and the determination result of the output destination. According to this technique, by changing the microcode stored in the instruction memory, it is possible to cope with a plurality of multiplexing methods, and it is possible to reduce the circuit scale and cost.
[0004]
However, in order to apply the technology disclosed in Japanese Patent Application Laid-Open No. 2001-308921 and reproduce a plurality of streams multiplexed by a plurality of multiplexing schemes, a stream based on one multiplexing scheme is received. Thereafter, every time switching to reception of a stream by another multiplexing method is necessary, the microcode stored in the instruction memory must be rewritten to a corresponding one. For this reason, it is impossible to simultaneously receive and reproduce a plurality of streams multiplexed by a plurality of multiplexing methods.
[0005]
In order to solve this, for example, a receiving device that receives digital broadcasting using a plurality of multiplexing systems includes a plurality of processing units corresponding to the plurality of multiplexing systems, and each processing unit receives a broadcast wave. An antenna, a tuner that selectively tunes a modulated wave containing a channel specified by the user from among a plurality of modulated waves, and a tuner that digitally demodulates the received modulated wave and performs error correction to perform each multiplexing A demodulator for outputting a transport stream conforming to the standard, a packet separator for separating transport packets from the transport stream, a transport decoder for extracting a desired transport packet from a plurality of transport packets, and video data. Video decoder that generates video information by decompressing and decoding video, and decompressing audio data A speech decoder for generating a speech signal by decoding, it is sufficient to include a screen combining unit for generating a video signal by combining the video information and service information. As described above, since the receiving device includes the plurality of processing units corresponding to the plurality of multiplexing systems, it is possible to simultaneously receive and reproduce a plurality of streams.
[0006]
[Problems to be solved by the invention]
However, in order to newly cope with other multiplexing schemes and to cope with multiplexing schemes of different combinations, it is necessary to newly provide a corresponding processing unit, and the problem of lack of expandability. There are points.
The present invention solves the above problems, and can simultaneously receive and reproduce a plurality of streams according to a plurality of multiplexing schemes, and perform reception of a stream according to a new multiplexing scheme or use a different combination. Provided is a multi-channel reproducing apparatus, a digital broadcast receiving apparatus, a multi-channel reproducing method, a multi-channel reproducing program, a multi-channel reproducing program, and a recording medium which can easily cope with a case where a stream is received by a multiplexing method. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a digital broadcast receiving apparatus characterized in that a plurality of streams of a plurality of types of multiplexing schemes are simultaneously received and multi-channel reproduction is performed on the same screen. Packet information analyzing means for analyzing packet information such as a packet identifier and a packet configuration of an input transport stream packet, and multiplexing based on the packet information analyzed by the packet information analyzing means. Format conversion means for format-converting the transport stream packet of the system into the transport stream packet of the DVB standard.
[0008]
The format conversion means includes a data arranging means for arranging video or audio data of each multiplexing method in a payload of a transport stream packet of the DVB standard, and a video or audio data of each multiplexing method according to the DVB standard. Adaptation field length adjusting means for adjusting the adaptation field length for arranging in the payload of the transport stream packet, and arranging the packet identifier of the transport stream packet of each multiplexing method in the packet identifier of the transport stream packet of the DVB standard And a packet identifier arranging means.
[0009]
Further, the present invention provides a packet identifier change determining means for determining whether to change the packet identifier allocated by the packet identifier allocating means, and a packet identifier of the transport stream packet determined by the packet identifier change determining means. And a packet identifier changing means for changing the packet identifier.
[0010]
The digital broadcasting targeted by the present invention can include any of CS digital broadcasting, BS digital broadcasting, terrestrial digital broadcasting, CATV digital broadcasting, and other types of digital broadcasting.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
A digital broadcast receiving device 100 as an embodiment according to the present invention will be described.
1. Configuration of digital broadcast receiving apparatus 100
As shown in FIG. 1, the digital broadcast receiving apparatus 100 includes a monitor 506 to which a DVB antenna 501 and a DSS antenna 502 are connected, DVDs 503,..., DVD 504 (not shown) are mounted, and a speaker 505 is provided. Is connected.
[0012]
The digital broadcast receiving apparatus 100 receives digital broadcast waves broadcast by the DVB (Digital Video Broadcasting) standard and the DSS (Digital Satellite System) standard via the DVB antenna 501 and the DSS antenna 502, respectively, and outputs the DVD 503,. , Read the video and audio data from the DVD 504, reproduce the received digital broadcast and the read video and audio data, and output them to the monitor 506. The monitor 506 outputs them.
[0013]
Here, when receiving the transport stream of the DVB standard, the digital broadcast receiving apparatus 100 outputs the transport stream packet of the DVB standard as it is. When a DSS standard transport stream is received, a DSS standard transport stream packet (Non-MPEG Data packet or Basic Service packet) is converted into a DVB standard transport stream packet and output. When a DVD standard system stream is obtained, the DVD standard pack is converted into a DVB standard transport stream packet and output.
[0014]
As shown in FIGS. 2 and 3, the digital broadcast receiving apparatus 100 includes m DVB tuners 171,..., 172, m DVB demodulators 173,. , 176, n DSS tuners 181, ..., 182, n DSS demodulators 183, ..., 184, n packet separators 185, ..., 186, k , 194, k pack separation units 191,..., 192, input selection unit 107, transport decoder 108, format conversion unit 109, packet identifier change unit 110, audio decoder 111, a video decoder 112, a screen synthesizing unit 113, a bus 118, an input unit 114, a CPU 115, a ROM 116, and a RAM 117.
[0015]
(1) DVB antenna 501
The DVB antenna 501 receives a plurality of digital broadcast waves of the DVB standard, and outputs the received plurality of digital broadcast waves to m DVB tuners 171,.
(2) DVB tuners 171, ..., 172
The m DVB tuners 171,..., 172 are provided corresponding to the m DVB demodulators 173,..., 174, respectively, and receive a plurality of digital broadcast waves from the DVB antenna 501, Through the CPU 115, one digital broadcast wave is selected in synchronization with a desired frequency specified by the user, and the selected digital broadcast wave is output to the corresponding DVD demodulation unit. The digital broadcast wave is a modulated wave carrying a transport stream of the DVB standard.
[0016]
(3) DVB demodulation unit 173,.
The m DVB demodulators 173,..., 174 are provided corresponding to the m packet separators 175,... 176, respectively, and the m DVB tuners 171,. 172, the received modulated wave is demodulated by a demodulation method corresponding to the modulation method, and error correction is performed to generate a DVB standard transport stream, and the generated transport stream corresponds to the transport stream. Output to the packet separation unit.
[0017]
FIG. 7 shows the data structure of the transport stream of the DVB standard. As shown in this figure, the transport stream 200 of the DVB standard is composed of a plurality of transport stream packets 201 of the DVB standard. The size of each transport stream packet is 188 bytes.
(4) Packet separation unit 175, ..., 176
, 176 receive DVB standard transport streams from the corresponding m DVB demodulators 173, 174, respectively, and separate the received transport streams. Then, a transport stream packet of the DVB standard is generated, and the generated transport stream packet is output to the input selection unit 107.
[0018]
FIG. 8 shows the data structure of a transport stream packet of the DVB standard (with an adaptation field / with a payload).
As shown in this figure, the transport stream packet 201 of the DVB standard has a length of 188 bytes, and includes a "sync byte" 202, a "transport error indicator" 203, a "payload unit start indicator" 204, a "transport priority" 205 and a "transport priority" 205. “PID (Packet Identification)” 206, “transport scrambling control” 207, “adaptation field control” 208, “continuity counter” 209, “adaptation field length” 210, and “adipation field” .
[0019]
“Sync byte” 202 is a synchronization byte having a value of 0x47. The “transport error indicator” 203 becomes “1” when the packet has an error. The “payload unit start indicator” 204 indicates that the payload of the packet has a PES (Packetized Elementary Stream) or PSI (Program Specific Information) header. The “transport priority” 205 indicates the priority of the packet. “PID (Packet Identification)” 206 is a packet identifier. “Transport scrambling control” 207 is “00” when the packet is not scrambled. The “adaptation field control” 208 indicates that the packet includes an adaptation field when the upper bit is “1”, and indicates that the packet includes a payload when the lower bit is “1”. This is '11' in the case of FIG. The “continuity counter” 209 is used to check whether packets having the same “PID” 206 are continuous discontinuity. The “adaptation field length” 210 indicates the length of the “adaptation field” 211. The “payload” 212 includes PES or PSI.
[0020]
In this figure, bslbf (Bit String Left Bit First) indicates a bit string starting from the leftmost bit, and uimsbf (Unsigned Integrator Most Significant Bit First) indicates the most significant bit without a leading integer. ing. The same applies to the following drawings. The number described before bslbf or uimsbf indicates the length of each field in bits.
[0021]
Next, FIG. 9 shows a data structure of a transport stream packet of the DVB standard (without an adaptation field / with a payload).
As shown in this figure, the same as the transport packet shown in FIG. 8 except that “adaptation field control” 208 is '01', and that “adaptation field length” 210 and “adaptation field” 211 do not exist. It is.
[0022]
(5) DSS antenna 502
The DSS antenna 502 receives a plurality of digital broadcast waves of the DSS standard and outputs the received plurality of digital broadcast waves to n DSS tuners 181,.
(6) DSS tuners 181, ..., 182
, 182 are provided corresponding to the n DSS demodulators 183,..., 184, respectively, and receive a plurality of digital broadcast waves from the DSS antenna 502, Through the CPU 115, one digital broadcast wave is selected in synchronization with a desired frequency specified by the user, and the selected digital broadcast wave is output to the corresponding DSS demodulation unit. The digital broadcast wave is a modulated wave carrying a DSS-standard transport stream.
[0023]
(7) DSS demodulation units 183, ..., 184
, 184 are provided corresponding to the n packet demultiplexers 185,..., 186, respectively, and the n DSS tuners 181,. 182, receive the modulated wave, demodulate the received modulated wave by a demodulation method corresponding to the modulation method, and perform error correction to generate a DSS standard transport stream, and correspond to the generated transport stream. Output to the packet separation unit.
[0024]
FIG. 10 shows the data structure of the transport stream of the DSS standard. As shown in this figure, the transport stream 300 of the DSS standard is composed of a plurality of transport stream packets 301 of the DSS standard. The size of each transport stream packet of the DSS standard is 130 bytes when received from the DSS demodulation unit.
[0025]
When receiving from a digital interface such as IEEE 1394, a 10-byte header is added, and the size of each transport stream packet is 140 bytes. When transferring this packet to the AV decoder, the transport decoder 108 deletes the 10-byte header. Therefore, in the following description, the size of the DSS transport stream packet is treated as 130 bytes.
[0026]
(8) Packet separation units 185,..., 186
, 186 receive DSS standard transport streams from the corresponding n DSS demodulators 183, 184, respectively, and separate the received transport streams. To generate a DSS standard transport stream packet. Here, among the generated transport stream packets, a packet including MPEG data may be a Non-MPEG Data packet or a Basic Service packet. Next, the generated transport stream packet is output to input selection section 107.
[0027]
DSS transport stream packet (Non-MPEG
FIG. 11 shows the data structure of the data packet (Data packet).
The transport stream packet 301 of the DSS standard includes “packet framing” 302, “bundle boundary” 303, “control flag” 304, “control sync” 305, “SCID (Service Channel Identification)” 306, and “continuity unit 30”. It is composed of “header designator” 308, “number of bytes” 309, “non-MPEG data” 310 and “MPEG data” 311.
[0028]
“Packet framing” 302 is alternately “0” or “1” for each packet. The “control flag” 304 is “0” if the packet is scrambled, and is “1” if the packet is not scrambled. “Control sync” 305 is “1” if the packet is scrambled with the ODD key, and is “0” if the packet is scrambled with the EVEN key. “SCID (Service Channel Identification)” 306 is a packet identifier. “Continuity counter” 307 is used to check whether packets having the same “SCID” 306 are continuous or discontinuous. “Header designator” 308 is used to indicate the type of application packet. “Number of bytes” 309 indicates the number of bytes of “non-MPEG data” 310. “Non-MPEG data” 310 is composed of data other than MPEG, and “MPEG data” 311 is composed of MPEG data.
[0029]
FIG. 12 shows the data structure of a DSS standard transport stream packet (however, Basic Service packet). The transport stream packet 301b includes “packet framing” 302, “bundle boundary” 303, “control flag” 304, “control sync” 305, “SCID (Service Channel Identification)” 306, and “continuity communication” 30 "308 and" MPEG data "311. The difference between the transport stream packet 301b and the transport stream packet 301 is that the transport stream packet 301b does not include the “number of bytes” 309 and the “non-MPEG data” 310, and the other points are the same.
[0030]
(9) DVD input section 193, ..., 194
The k DVD input units 193,..., 194 respectively correspond to the k pack separation units 191,..., 192, and the inserted k DVDs 503,. 504 is inserted. Each of the k DVDs 503,..., 504 records a DVD system stream. The k DVD input units 193,..., 194 read DVD-specific system streams from the k DVDs 503,..., 504, and output the read system streams to the corresponding pack separation units.
[0031]
FIG. 13 shows the data structure of the system stream of the DVD standard. As shown in this figure, the DVD standard system stream 400 is composed of a plurality of DVD standards 401 of the DVD standard.
(10) k pack separation units 191, ..., 192
, 192 respectively receive the system stream from the corresponding DVD input unit, separate the received system stream, generate a DVD pack of the DVD standard, and generate the generated DVD pack. Is output to the input selection unit 107.
[0032]
The data structure of the DVD standard pack is shown in FIGS.
As shown in FIG. 14, the DVD-standard pack 401 is composed of a “pack header” 402, a “system header” 403, a “PES packet # 0” 404,..., A “PES packet #N” 407. .
[0033]
A “pack header” 402 is a variable-length header including a pack header start code, timing information, and the like. The “system header” 403 is a variable-length header including a system header start code, a system header length, and the like, and exists after the pack header of the first pack. “PES packet # 0” 404,..., “PES packet #N” 407 are composed of MPEG data.
[0034]
Also, as shown in FIG. 15, the pack 401b of the DVD standard when the "system header" 403 does not exist, includes "pack header" 402, "PES packet # 0" 404,..., "PES packet #N". 407.
(11) Input selection unit 107
The input selecting unit 107 includes m transport streams packets of the DVB standard output from the m packet separating units 175,..., 176, and the n packet separating units 185,. Through the control of the CPU 115, from among the output DS system transport stream packets of the n systems and the DVD system streams of the k systems output from the k pack separation units 191,. The i-line designated by the user is selected, and the selected i-line is output to the transport decoder 108. At this time, the input selection unit 107 adds a packet type indicating each standard to each pack and each pack. The packet type is one of “DVB”, “DSS (Non-MPEG Data Packet)”, “DSS (Basic Service Packet)”, and “DVD”.
[0035]
(12) Transport decoder 108
The transport decoder 108 receives the i-system stream from the input selection unit 107, and extracts a packet or a pack specified by the user under the control of the CPU 115. Further, the transport decoder 108 analyzes the extracted packet or pack, obtains a packet type, a packet identifier, the number of non-MPEG Data bytes, an MPEG data start position, and a payload size from the packet or pack, and obtains the obtained packet type. , The packet identifier, the number of non-MPEG Data bytes, the MPEG data start position, and the payload size are written in the packet information table 135 of the format conversion unit 109. Further, the extracted packet or pack is written in the packet buffer 134 of the format conversion unit 109.
[0036]
Here, when the packet type is "DVB", the packet identifier is PID, the number of non-MPEG Data bytes is "adaptation field length" 210, and the MPEG data start position is the head position of "payload" 212. , And the payload size is the size of “payload” 212.
[0037]
When the packet type is “DSS (Non-MPEG Data Packet)”, the packet identifier is SCID, the number of non-MPEG Data bytes is “number of bytes” 309, and the MPEG data start position is “ This is the start position of “MPEG data” 311, and the payload size is the size of “MPEG data” 311.
[0038]
When the packet type is “DSS (Basic Service packet)”, the packet identifier is SCID, the number of non-MPEG Data bytes is 0 because it is a Basic Service packet, and the MPEG data start position is “MPEG data "311 and the payload size is the size of" MPEG data "311.
[0039]
When the packet type is “DVD”, the packet identifier is the new ID, the non-MPEG Data byte count is the total byte count of “pack header” 402 and “system header” 403, and the MPEG data start position. Is the start position of the “PES packet # 0” 404, and the payload size is 1 to 184 bytes, as shown in FIG.
[0040]
(13) Format conversion unit 109
The format converter 109 converts the format of the transport stream packet of the DSS standard and the pack of the DVD standard into a transport stream packet of the DVB standard.
As shown in FIG. 4, the format conversion unit 109 includes a header generation unit 131, an adaptation field length calculation unit 132, a data arrangement unit 133, a packet buffer 134, and a packet information table 135.
[0041]
The packet information table 135 stores information on packets or packs analyzed by the transport decoder 108. Information on a packet or a pack includes a packet type, a packet identifier, the number of non-MPEG Data bytes, an MPEG data start position, and a payload size.
The header generation unit 131 generates a 4-byte header included in the transport stream packet of the DVB standard based on the information stored in the packet information table 135.
[0042]
The adaptation field length calculation unit 132 calculates the adaptation field length based on the information stored in the packet information table 135. The data arranging unit 133 arranges video and audio data in the payload part of the transport stream packet of the DVB standard based on the information stored in the packet information table 135.
[0043]
The packet buffer 134 holds the packet or pack output from the transport decoder 108.
(14) Packet identifier changing unit 110
The packet identifier changing unit 110 changes the packet identifier so that the packet identifier does not overlap.
[0044]
As shown in FIG. 5, the packet identifier change unit 110 includes a packet identifier determination unit 151, a change target packet identifier table 152, and a post-change packet identifier table 153.
The change target packet identifier table 152 stores a packet identifier to be changed in advance.
[0045]
The post-change packet identifier table 153 stores in advance the post-change packet identifier.
The packet identifier determination unit 151 receives the transport stream packet of the DVB standard from the format conversion unit 109, and the packet identifier included in the received transport stream packet is the same as the packet identifier included in the change target packet identifier table 152. If they are the same, the packet identifier contained in the received transport stream packet is replaced with the packet identifier stored in the post-change packet identifier table 153, and the transposed packet identifier is replaced. The port stream packet is output to the audio decoder 111 and the video decoder 112.
[0046]
If it is determined that the packet identifier included in the received transport stream packet is not the same as the packet identifier included in the change target packet identifier table 152, the received transport stream packet is converted to the audio decoder 111 and the video decoder 112. Output to
(15) Audio decoder 111, video decoder 112, screen synthesis unit 113
The audio decoder 111 receives the transport stream packet from the packet identifier changing unit 110, generates audio data by decompressing and decoding based on the received transport packet, and outputs the generated audio data to the speaker 505. I do.
[0047]
The video decoder 112 receives the transport stream packet from the packet identifier changing unit 110, generates video data by decompressing and decoding based on the received transport packet, and converts the generated video data into a screen synthesizing unit 113. Output to
The screen combining unit 113 receives the video data from the video decoder 112, combines the received video data with the service information to generate an image signal, and outputs the generated image signal to the monitor 506.
[0048]
(16) Other components
The input unit 114 includes buttons on a front panel, a remote control transmitter, and the like, and receives an input from a user. The CPU 115 controls the entire digital broadcast receiving apparatus 100. A ROM (Read Only Memory) 116 stores programs and the like. The RAM 117 (random access memory) is used as a working memory. The bus 118 connects the CPU 115 and each unit.
[0049]
The ROM 116 is preferably a rewritable nonvolatile memory such as a flash memory, but need not be.
2. Operation of digital broadcast receiving apparatus 100
The operation of the digital broadcast receiving device 100 will be described.
(1) Operation of format converter 109
The operation of the format conversion unit 109 will be described with reference to the flowcharts shown in FIGS.
[0050]
The transport decoder 108 analyzes the input packet, and registers and analyzes the packet type, the packet identifier, the number of non-MPEG Data bytes, the MPEG data start position, and the payload size in the packet information table 135 of the format conversion unit 109. The packet is transferred to the packet buffer 134 of the format converter 109 (step S1).
[0051]
Next, the header generation unit 131 of the format conversion unit 109 extracts the packet type registered in the packet information table 135 of the format conversion unit 109, determines whether the packet type is DSS, and if it is DSS (step S2), Control is transferred to step S4. If it is not a DSS (step S2), it is further determined whether or not it is a DVD. If it is a DVD (step S3), control is transferred to step S12. If it is not a DVD (step S3), control is transferred to step S35.
[0052]
(Conversion from DSS standard)
Steps S4 to S11 described below are procedures unique to conversion from a transport stream packet of the DSS standard.
The header generation unit 131 of the format conversion unit 109 generates a model of the DVB standard transport stream packet in the packet buffer 134 of the format conversion unit 109. The data structure of the template of the generated DVB standard transport stream packet is as shown in FIG. 8 (step S4).
[0053]
Next, the header generation unit 131 of the format conversion unit 109 sets “0x47000030” to the 4 bytes of the header of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109 (step S5).
Next, the header generation unit 131 of the format conversion unit 109 extracts the packet identifier registered in the packet information table 135 of the format conversion unit 109, and generates the extracted packet identifier in the packet buffer 134 of the format conversion unit 109. It is set to the “PID” 206 of the transport stream packet of the DVB standard (step S6).
[0054]
Next, the adaptation field length calculation unit 132 of the format conversion unit 109 calculates the adaptation field length to be 56 bytes (step S7).
Next, the adaptation field length calculation unit 132 of the format conversion unit 109 extracts the packet type registered in the packet information table 135 of the format conversion unit 109, determines whether the packet type is a Non-MPEG Data packet, and determines whether the packet is a Non-MPEG Data packet. Only when it is determined that the packet is a packet (step S8), the adaptation field length calculator 132 of the format converter 109 extracts the number of non-MPEG Data bytes registered in the packet information table 135 of the format converter 109. Then, the adaptation field length is calculated again as 57 bytes + non-MPEG Data byte number (step S9).
[0055]
Next, the adaptation field length calculation unit 132 of the format conversion unit 109 sets the calculated adaptation field length in the “adaptation field length” 210 of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109. (Step 10).
[0056]
Next, the data arranging unit 133 of the format conversion unit 109 stores the received DSS standard transport stream packet (Non) in the 130 bytes after the DVB standard transport stream packet generated in the packet buffer 134 of the format conversion unit 109. -Placing an MPEG Data packet or Basic Service packet (step 11).
[0057]
Next, the control moves to step S35.
By the above sequence operation, the DSS standard transport stream packet (Non-MPEG Data packet or Basic Service packet) received from the transport decoder 108 is format-converted by the format conversion unit 109 into a DVB standard transport stream packet. The packet is output to the packet identifier changing unit 110.
[0058]
FIGS. 16A and 16B show the data structure of the DSS standard transport stream packet (Non-MPEGData packet) before conversion and the data structure of the DVB standard transport stream packet after conversion, respectively. 17A and 17B show the data structure of the DSS standard transport stream packet (Basic Service packet) before conversion and the data structure of the DVB standard transport stream packet after conversion, respectively.
[0059]
(Conversion from DVD standard)
Steps S12 to S34 described below are procedures unique to conversion from a DVD standard pack. In particular, S12 to S18 relate to the conversion of the header part (pack header and system header) of the DVD standard pack, and S19 to S34 relate to the conversion of the PES packet part.
S20 to S23 relate to the case where there is no adaptation field, and S27 to S31 relate to the case where there is an adaptation field.
[0060]
The header generation unit 131 of the format conversion unit 109 generates a model of the DVB standard transport stream packet in the packet buffer 134 of the format conversion unit 109. The data structure of the template of the generated transport stream packet of the DVB standard is as shown in FIG. 8 (step S12).
Next, the header generation unit 131 of the format conversion unit 109 sets “0x47000020” to the 4 bytes of the header of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109 (step S13).
[0061]
Next, the header generation unit 131 of the format conversion unit 109 extracts the packet identifier registered in the packet information table 135 of the format conversion unit 109, and generates the extracted packet identifier in the packet buffer 134 of the format conversion unit 109. It is set to the "PID" 206 of the transport stream packet of the DVB standard (step S14).
[0062]
Next, the adaptation field length calculation unit 132 of the format conversion unit 109 sets 0xB7 (183 bytes) in the “adaptation field length” 210 of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109. (Step S15).
[0063]
Next, the data arranging unit 133 of the format converter 109 arranges “pack header” 402 and “system header” 403 in the adaptation field of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format converter 109. (Step S16).
[0064]
Next, the header generation unit 131 of the format conversion unit 109 extracts the number of non-MPEG Data bytes registered in the packet information table 135 of the format conversion unit 109 and determines whether the number is 183 bytes or less (step S17). ). If the number of non-MPEG Data bytes is larger than 183 bytes (step S17), the header generation unit 131 of the format conversion unit 109 newly adds a value obtained by subtracting 183 from the number of non-MPEG Data bytes to the number of non-MPEG Data bytes. It overwrites the packet information table 135 of the format conversion unit 109 as a number (step S18), and then shifts control to step S12 to repeat the processing.
[0065]
When the number of non-MPEG Data bytes is 183 bytes or less (step S17), the header generation unit 131 of the format conversion unit 109 extracts the payload size registered in the packet information table 135 of the format conversion unit 109, and extracts the extracted payload. It is determined whether the size is 184 bytes (step S19). If it is not 184 bytes (step S19), the control moves to step S27.
[0066]
If it is 184 bytes (step S19), the header generation unit 131 of the format conversion unit 109 generates a transport stream packet model of the DVB standard in the packet buffer 134 of the format conversion unit 109. FIG. 9 shows the data structure of the template of the generated DVB standard transport stream packet (step 20).
[0067]
Next, the header generation unit 131 of the format conversion unit 109 sets “0x47000010” in the header of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109 (step S21).
Next, the header generation unit 131 of the format conversion unit 109 extracts the packet identifier registered in the packet information table 135 of the format conversion unit 109, and generates the extracted packet identifier in the packet buffer 134 of the format conversion unit 109. It is set to the "PID" 206 of the transport stream packet of the DVB standard (step S22).
[0068]
Next, the data arranging unit 133 of the format conversion unit 109 stores the 184 bytes after the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109 from the received PES packet of the DVD pack of the DVD standard. 184 bytes are extracted and arranged (step S23).
Next, the data arrangement unit 133 of the format conversion unit 109 determines whether or not there is any remaining data in the PES packet (Step S24). If there is no remaining data (step S24), the control is transferred to step S35. If there is remaining data (step S24), it is further determined whether the number of remaining data of the PES packet is smaller than the payload size (step S25). If they are larger or equal (step S25), the control is moved to step S19. If it is smaller (step S25), the number of remaining data in the PES packet is newly set as the number of payloads (step S26), and control is transferred to step S19.
[0069]
The header generation unit 131 of the format conversion unit 109 generates a model of the DVB standard transport stream packet in the packet buffer 134 of the format conversion unit 109. FIG. 8 shows a data structure of a model of a transport stream packet of the DVB standard to be generated (step S27).
Next, the header generation unit 131 of the format conversion unit 109 sets “0x47000030” to the 4 bytes of the header of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109 (step S28).
[0070]
Next, the header generation unit 131 of the format conversion unit 109 extracts the packet identifier registered in the packet information table 135 of the format conversion unit 109, and generates the extracted packet identifier in the packet buffer 134 of the format conversion unit 109. It is set to “PID” 206 of the transport stream packet of the DVB standard (step S29).
[0071]
Next, the adaptation field length calculation unit 132 of the format conversion unit 109 stores (183 bytes−payload byte size) in “adaptation field length” 210 of the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109. ) Is set (step S30).
[0072]
Next, the data arranging unit 133 of the format conversion unit 109 stores the PES packet of the received DVD standard DVD pack in the payload size byte after the transport stream packet of the DVB standard generated in the packet buffer 134 of the format conversion unit 109. Then, the payload size bytes are extracted and arranged from (step S31).
[0073]
Next, the data arrangement unit 133 of the format conversion unit 109 determines whether there is any remaining data in the PES packet (Step S32). If there is no remaining data (step S32), the control moves to step S35. If there is remaining data (step S32), it is further determined whether or not the number of remaining PES packet data is smaller than the payload size (step S33). If they are larger or equal (step S33), the control is moved to step S19. If smaller (step S33), the number of remaining PES packet data is newly set as the number of payloads (step S34), and control is transferred to step S19.
[0074]
By the above sequence operation, the DVD pack of the DVD standard input from the transport decoder 108 is format-converted into a transport stream packet of the DVB standard by the format converter 109 and output to the packet identifier changing unit 110.
When there is no adaptation field, the data structure of the pack 602 of the DVD standard before conversion, the data structure of the transport stream packet of the DVB standard after conversion (for header), and the data structure of the transport stream packet of the DVB standard after conversion (For data) are shown in FIGS. 18 (a), (b) and (c), respectively.
[0075]
Also, when there is an adaptation field, the data structure of the pack 602 of the DVD standard before conversion, the data structure of the transport stream packet of the DVB standard after conversion (for header), and the data structure of the transport stream packet of the DVB standard after conversion are used. The data structure (for data) is shown in FIGS. 19 (a), (b) and (c), respectively.
[0076]
(Procedure common to each standard)
The data arranging unit 133 of the format converting unit 109 transfers all the DVB standard transport stream packets held in the packet buffer 134 to the packet identifier changing unit 110. Upon completion of the transfer, all transport stream packets of the DVB standard held in the packet buffer 134 are deleted (step S35).
[0077]
By the above-described sequence operation, the transport stream packet of the DVB standard input from the transport decoder 108 is output to the packet identifier changing unit 110 without being format-converted by the format conversion unit 109.
(2) Operation of packet identifier changing section 110
The operation of the packet identifier changing unit 110 for changing the packet identifier of the transport stream packet of the DVB standard after the format conversion by the format conversion unit 109 will be described with reference to the flowchart shown in FIG.
[0078]
The packet identifier determination unit 151 analyzes the packet input from the format conversion unit 109, extracts the packet identifier (Step S101), and acquires the change target packet identifier set in the change target packet identifier table 152 (Step S101). S102), it is determined whether or not the extracted packet identifier matches the acquired change target packet identifier (step S103).
[0079]
If they match (step S103), the packet identifier determination unit 151 acquires the post-change packet identifier set in the post-change packet identifier table 153 (step S104), and the packet of the packet received from the format conversion unit 109. The identifier is changed to the acquired changed packet identifier (step S105).
[0080]
Next, the packet identifier determination unit 151 transfers the transport stream packet of the DVB standard to the audio decoder 111 or the video decoder 112 according to the packet type (Step S106).
By the above sequence operation, the transport stream packet of the DVB standard input from the format conversion unit 109 has its packet identifier changed by the packet identifier changing unit 110 as necessary, and is transmitted to the audio decoder 111 or the video decoder 112. Is output.
[0081]
3. Conclusion
According to the digital broadcast receiving apparatus of the present invention, a plurality of streams of a plurality of multiplexing schemes can be simultaneously received and processed, and multi-channel reproduction can be performed. It becomes possible to do.
As described above, since a plurality of streams formed by a plurality of multiplexing methods are converted into DVB standard transport stream packets having no duplicate packet identifiers and input to the video decoder 112, the video decoder 112 And it is possible to reproduce each data.
[0082]
Therefore, the connection form of the packet identifier changing unit 110, the video decoder, and the audio decoder via the RAM can be as shown in FIG. 6, and the number of data signal lines and request signal lines for the video decoder 112 is one. Thus, the circuit scale can be reduced.
Further, since the number of interfaces between the RAM and the video decoder can be reduced, the circuit scale can be reduced.
[0083]
Furthermore, even when the combination of streams to be received is changed, it is only necessary to change the configuration of the front-end unit including the tuner, the demodulation unit, and the packet separation unit. Become.
Thus, it is possible to provide a highly expandable digital broadcast receiving apparatus capable of simultaneously receiving a plurality of streams of a plurality of multiplexing schemes and performing multi-channel reproduction, further reducing the circuit scale and increasing the degree of freedom in system configuration. The advantageous effect that can be obtained is obtained.
[0084]
Although the present invention has been described based on the above embodiment, it is needless to say that the present invention is not limited to the above embodiment. The following cases are also included in the present invention.
(1) In the above embodiment, multi-channel reproduction of three channels of “DVB + DSS + DVD” has been described. However, the number of channels for multi-channel reproduction is not limited to three, but two or more may be four or more. Is also good.
[0085]
It should be noted that multi-channel reproduction using combinations such as “DVB + DVB + DVD” and “DVB + DSS + DSS” by changing the combination of input streams is also possible.
(2) In the above-described embodiment, an example has been described in which the DVB standard, the DSS standard, and the DVD standard are format-converted to the DVB standard as the multiplexing method. However, other multiplexing methods can be similarly implemented.
[0086]
(3) The packet identifier determination unit 151 stores in advance standard identification information for identifying a specific standard, and determines that the packet identifier is always changed for the standard identified by the stored standard identification information. You may do so. For example, the packet identifier determining unit 151 stores in advance standard identification information for identifying the DSS standard, and always determines to change the packet identifier for the DSS standard identified by the stored standard identification information. It may be.
[0087]
(4) The present invention may be the method described above. Further, these methods may be a computer program that is realized by a computer, or may be a digital signal formed by the computer program.
Further, the present invention provides a computer-readable recording medium for reading the computer program or the digital signal, for example, a flexible disk, a hard disk, a CD-ROM, an MO, a DVD, a DVD-ROM, a DVD-RAM, a BD (Blu-ray Disc). ), A semiconductor memory or the like. Further, the present invention may be the computer program or the digital signal recorded on these recording media.
[0088]
Further, according to the present invention, the computer program or the digital signal may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, or the like.
The present invention may be a computer system including a microprocessor and a memory, wherein the memory stores the computer program, and the microprocessor operates according to the computer program.
[0089]
Further, the program or the digital signal is recorded on the recording medium and transferred, or the program or the digital signal is transferred via the network or the like, so that it is executed by another independent computer system. It may be.
(5) The above embodiments and the above modifications may be combined.
[0090]
【The invention's effect】
As described above, the present invention is a multi-channel reproducing apparatus that acquires and reproduces two data streams respectively formed by two types of multiplexing schemes, and uses a first and a second multiplexing scheme. Acquiring means for acquiring the first and second data streams formed in a prescribed format in the same time zone, and format-converting the acquired second data stream into a format prescribed by the first multiplexing method Conversion means for generating a converted data stream; and reproducing means for reproducing the acquired first data stream and the generated converted data stream on the same screen.
[0091]
According to this configuration, the conversion means converts the second data stream into a format according to the first multiplexing method, and the reproducing means reproduces the data stream according to the first multiplexing method. Since the formed separate data streams are reproduced, there is an effect that it is not necessary to provide a means for reproducing the data stream formed in the format specified by the second multiplexing method.
[0092]
Here, the first and second data streams are each composed of a plurality of packets, each packet includes a packet identifier for identifying the packet, and the conversion unit determines that the first and second data streams are the same. When the packet identifier is included, the packet identifier included in the second data stream is changed so that all packet identifiers are different, and a converted data stream including the changed packet identifier is generated.
[0093]
According to this configuration, when the first and second data streams include the same packet identifier, the conversion unit changes the packet identifier included in the second data stream so that all packet identifiers are different. This has the effect that confusion does not occur in each packet.
Here, the conversion unit includes a determination unit that determines whether to change a packet identifier included in the second data stream, and a determination unit that determines whether to change the packet identifier included in the first and second data streams. Changing means for changing a packet identifier included in the second data stream so that the packet identifiers of the second data stream are different from each other; and defining the second data stream including the changed packet identifier by the first multiplexing method. Generating means for converting the format into a format to generate a converted data stream.
[0094]
According to this configuration, since it is determined whether or not to change the packet identifier included in the second data stream, there is an effect that the data stream whose packet identifier is to be changed can be reliably selected.
Here, video data or audio data is multiplexed by each multiplexing method to form each data stream, and the first multiplexing method is a multiplexing method defined by the DVB standard. Is equivalent to a transport stream packet in the DVB standard, the transport stream packet includes a payload for storing divided video data or audio data, and the conversion unit is included in the second data stream. The video data or the audio data is arranged in the payload of the transport stream packet to generate a transport stream packet conforming to the DVB standard, and the reproducing unit reproduces the data stream in the format according to the DVB standard.
[0095]
According to this configuration, a data stream formed by various multiplexing methods is converted into a format specified by the DVB standard, so that a data stream formed by a format specified by a multiplexing method other than the DVB standard is reproduced. There is an effect that there is no need to provide a means for performing this.
Here, the conversion means adjusts an adaptation field length to arrange video data or audio data included in the second data stream in a payload of a transport stream packet, and converts the video data or audio data into a DVB standard transport stream packet. I do.
[0096]
According to this configuration, the conversion unit adjusts the adaptation field length and converts the format into the transport stream packet of the DVB standard, so that the transport stream packet of the DVB standard can be reliably generated.
Here, the first and second data streams each include a plurality of packets, each packet includes a packet identifier for identifying the packet, and the first multiplexing method is a multiplexing method defined by the DVB standard. The packet included in the first data stream is equivalent to a transport stream packet in the DVB standard, each transport stream packet includes a packet identifier, and the conversion unit includes a packet included in the second data stream. The packet identifier of the transport stream packet conforming to the DVB standard is arranged in the packet identifier of the transport stream packet conforming to the DVB standard, and the format is converted into a transport stream packet conforming to the DVB standard.
[0097]
According to this configuration, the conversion unit arranges the packet identifier included in the second data stream in the packet identifier of the transport stream packet in the DVB standard and converts the format into the transport stream packet in the DVB standard. The packet identifier included in the data stream can be inherited in the converted data stream.
[0098]
The present invention also relates to a digital broadcast receiving apparatus for receiving and reproducing two data streams formed and broadcast according to two types of multiplexing schemes, respectively defined by first and second multiplexing schemes. Receiving means for receiving the first and second data streams formed in the same format in the same time zone, and converting the format of the received second data stream into a format defined by the first multiplexing method, A conversion unit that generates a converted data stream; and a reproducing unit that reproduces the received first data stream and the generated converted data stream on the same screen.
[0099]
According to this configuration, the conversion means converts the second data stream into a format according to the first multiplexing method, and the reproducing means reproduces the data stream according to the first multiplexing method. Since the formed separate data streams are reproduced, there is an effect that it is not necessary to provide a means for reproducing the data stream formed in the format specified by the second multiplexing method.
[Brief description of the drawings]
FIG. 1 shows external views of a digital broadcast receiving apparatus 100, a DVB antenna 501, a DSS antenna 502, and a monitor 506, and a connection relation between these apparatuses.
FIG. 2 is a block diagram showing a configuration of the digital broadcast receiving device 100. Continued from FIG.
FIG. 3 is a block diagram showing a configuration of the digital broadcast receiving device 100. Continued from FIG.
FIG. 4 is a block diagram showing a configuration of a format conversion unit 109.
FIG. 5 is a block diagram showing a configuration of a packet identifier changing unit 110.
FIG. 6 shows a connection configuration of a packet identifier changing unit 110, a video decoder, and an audio decoder.
FIG. 7 shows a data structure of a transport stream of the DVB standard.
FIG. 8 shows a data structure of a transport stream packet of the DVB standard (with an adaptation field / with a payload).
FIG. 9 shows a data structure of a transport stream packet of the DVB standard (without an adaptation field / with a payload).
FIG. 10 shows a data structure of a transport stream of the DSS standard.
FIG. 11 shows a transport stream packet of the DSS standard (however, Non-MPEG
3 shows a data structure of a data packet.
FIG. 12 shows a data structure of a transport stream packet of the DSS standard (however, a Basic Service packet).
FIG. 13 shows a data structure of a system stream of the DVD standard.
FIG. 14 shows a data structure of a DVD-standard pack (including a system header).
FIG. 15 shows a data structure of a DVD standard pack (not including a system header).
FIG. 16A shows a data structure of a DSS standard transport stream packet before conversion.
(B) shows a data structure of a transport stream packet (Non-MPEG Data packet) of the DVB standard after conversion.
FIG. 17A shows a data structure of a DSS standard transport stream packet before conversion.
(B) Transport stream packet of the DVB standard after conversion (Basic
3 shows a data structure of a service packet (Service packet).
FIG. 18A shows a data structure of a DVD standard pack 602 before conversion.
(B) shows the data structure (for header) of the transport stream packet of the DVB standard after conversion.
(C) shows a data structure (for data) of a converted DVB standard transport stream packet (when there is no adaptation field).
FIG. 19A shows a data structure of a DVD standard pack 602 before conversion.
(B) shows the data structure (for header) of the transport stream packet of the DVB standard after conversion.
(C) Shows the data structure (for data) of the converted DVB standard transport stream packet (when there is an adaptation field).
FIG. 20 is a flowchart showing the operation of the format conversion unit 109. It continues to FIG.
FIG. 21 is a flowchart showing the operation of the format conversion unit 109. It continues to FIG.
FIG. 22 is a flowchart showing the operation of the format conversion unit 109. It continues to FIG.
FIG. 23 is a flowchart showing the operation of the format conversion unit 109. It continues to FIG.
FIG. 24 is a flowchart showing the operation of the format conversion unit 109. Continued from FIG.
FIG. 25 is a flowchart showing the operation of the packet identifier changing unit 110.
[Explanation of symbols]
100 Digital broadcast receiver
107 Input selection section
108 transport decoder
109 Format conversion unit
110 Packet identifier changing unit
111 audio decoder
112 Video Decoder
113 Screen synthesis unit
114 Input section
115 CPU
116 ROM
117 RAM
118 Bus
131 Header generation unit
132 Adaptation field length calculator
133 Data Allocation Section
134 packet buffer
135 Packet Information Table
151 Packet Identifier Judgment Unit
152 change target packet identifier table
153 Packet identifier table after change
171 ... 172 DVB tuner
173 ... 174 DVB demodulation unit
175 ... 176 Packet separation unit
181 ... 182 DSS tuner
183 ... 184 DSS demodulation unit
185 ... 186 Packet separation unit
191 ... 192 Pack separation unit
193 ... 194 DVD input unit
501 DVB antenna
502 DSS antenna
503 ... 504 DVD
505 speaker
506 monitor

Claims (10)

A multi-channel reproducing apparatus for acquiring and reproducing two data streams respectively formed by two types of multiplexing methods,
Acquiring means for acquiring first and second data streams formed in formats respectively defined by the first and second multiplexing schemes in the same time zone;
Converting means for converting the format of the obtained second data stream into a format defined by the first multiplexing method to generate a converted data stream;
A multi-channel reproducing apparatus comprising: reproducing means for reproducing the acquired first data stream and the generated converted data stream on the same screen. The first and second data streams are each composed of a plurality of packets, each packet including a packet identifier identifying the packet,
When the first and second data streams include the same packet identifier, the conversion unit changes a packet identifier included in the second data stream so that all packet identifiers are different. The multi-channel reproduction device according to claim 1, wherein the multi-channel reproduction device generates a converted data stream including an identifier. The conversion means,
Determining means for determining whether to change a packet identifier included in the second data stream;
Changing means for changing a packet identifier included in the second data stream so that all packet identifiers included in the first and second data streams are different if determined to be changed;
3. A generating means for converting the format of the second data stream including the changed packet identifier into a format defined by the first multiplexing method, and generating a converted data stream. 5. The multi-channel playback device according to claim 1. By each multiplexing method, video data or audio data is multiplexed to form each data stream,
The first multiplexing method is a multiplexing method defined by the DVB standard. A packet included in the first data stream corresponds to a transport stream packet in the DVB standard, and the transport stream packet is divided. Including a payload that stores video data or audio data,
The converting means arranges video data or audio data included in the second data stream in a payload of the transport stream packet to generate a transport stream packet of the DVB standard,
4. The multi-channel reproducing apparatus according to claim 3, wherein said reproducing means reproduces a data stream in a format according to the DVB standard. The converting means converts the video data or audio data included in the second data stream into a DVB standard transport stream packet by adjusting an adaptation field length so as to be arranged in a payload of the transport stream packet. The multi-channel playback device according to claim 4, wherein The first and second data streams are each composed of a plurality of packets, each packet including a packet identifier identifying the packet,
The first multiplexing method is a multiplexing method defined by the DVB standard. Packets included in the first data stream correspond to transport stream packets in the DVB standard, and each transport stream packet has a packet identifier. Including
2. The format conversion device according to claim 1, wherein the conversion unit arranges a packet identifier included in the second data stream into a packet identifier of a transport stream packet conforming to the DVB standard and converts the format into a transport stream packet conforming to the DVB standard. 5. The multi-channel playback device according to claim 1. A digital broadcast receiving apparatus for receiving and reproducing two data streams formed and broadcast according to two types of multiplexing systems,
Receiving means for receiving first and second data streams formed in formats respectively defined by the first and second multiplexing systems in the same time zone;
Converting means for converting the format of the received second data stream into a format defined by the first multiplexing method to generate a converted data stream;
A digital broadcast receiving apparatus, comprising: reproducing means for reproducing the received first data stream and the generated converted data stream on the same screen. A multi-channel reproduction method used in a multi-channel reproduction device that acquires and reproduces two data streams respectively formed by two types of multiplexing methods,
An acquisition step of acquiring first and second data streams formed in formats respectively defined by the first and second multiplexing schemes in the same time zone;
Converting the acquired second data stream into a format defined by the first multiplexing method to generate a converted data stream;
A reproducing step of reproducing the obtained first data stream and the generated converted data stream on the same screen. A multi-channel reproduction program used in a multi-channel reproduction device that acquires and reproduces two data streams respectively formed by two types of multiplexing methods,
An acquisition step of acquiring first and second data streams formed in formats respectively defined by the first and second multiplexing schemes in the same time zone;
Converting the acquired second data stream into a format defined by the first multiplexing method to generate a converted data stream;
A reproducing step of reproducing the acquired first data stream and the generated converted data stream on the same screen. A computer-readable recording medium that records a multi-channel reproduction program used in a multi-channel reproduction device that acquires and reproduces two data streams respectively formed by two types of multiplexing methods,
An acquisition step of acquiring first and second data streams formed in formats respectively defined by first and second multiplexing systems in the same time zone;
Converting the acquired second data stream into a format defined by the first multiplexing method to generate a converted data stream;
A reproducing step of reproducing the acquired first data stream and the generated converted data stream on the same screen.

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