JP3589913B2 - Digital signal receiving device, digital signal processing device, and program recording medium - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital signal receiving apparatus that receives, decodes, and displays a bit stream encoded based on MPEG2.
[0002]
[Prior art]
In recent years, a transmission / reception system using digital high-efficiency coding has been put into practical use due to international standardization (registering in ISO / IEC 13818) of MPEG2 (Moving Picture Experts Group2). By using the MPEG2 coding method, it is possible to increase the number of channels under a certain transmission band, but at the same time, the number of channels of a broadcast program exceeds 100, and from among such a large number of broadcast programs, It is virtually difficult for a user to instantly select a program desired to be viewed.
[0003]
One method for solving this problem is to use a multi-screen for reducing, arranging and displaying a plurality of program videos on one screen. The multi-screen allows the user to visually select a desired program.
[0004]
Hereinafter, a conventional multi-screen display method will be described. FIG. 7 is a block diagram showing a configuration of a conventional multi-screen display system.
[0005]
In FIG. 7, reference numeral 91 denotes PID filter means for dividing a transport stream defined by MPEG2 for each packet identification number (hereinafter, referred to as PID); 92, a buffer memory for temporarily storing the output of the PID filter means; , A decoding memory 94 used by the video decoding means, and a control means 95 for controlling the PID filter means 91 and the video decoding means 93. A signal 900 is an input transport stream, signals 901 and 902 are packetized elementary streams (hereinafter referred to as PES) obtained by removing headers from transport packets, a signal 903 is a data request signal from video decoding means, A signal 904 indicates a decode result output.
[0006]
The operation of the conventional multi-screen display system configured as described above will be described below. First, the program receiver notifies the control means 95 of the intention of calling the multi-screen by, for example, pressing a button on the remote controller. The control means 95 sets the PID of the transport stream 900 on which the multi-channel is broadcast in the PID filter means 91. An output 901 of the PID filter means 91 outputs PES data 902 via the buffer memory 92 in accordance with a data request signal 903 from the video decoding means.
[0007]
The video decoding means 93 performs video decoding using the decoding memory 94 in accordance with the rules of MPEG2, and outputs a baseband video signal 904. Since the video signal 904 is composed of a screen in which one screen is multi-channeled into, for example, 16 divisions on the transmission side, the user can view the multi-channel screen.
[0008]
[Problems to be solved by the invention]
The multi-screen display method according to the prior art is as described above. However, in such a configuration, the multi-screen includes only a specific program determined by the transmitter side, and such a multi-screen is used. The screen does not always include the program expected by the receiver.
[0009]
Further, visually, a maximum of one screen is divided into about 16 divisions, and displaying more than one simultaneous program does not make sense. Therefore, in the current broadcasting mode exceeding 100 channels, the number of programs that can be multi-displayed simultaneously is limited. There is a problem that.
[0010]
The present invention has been made in view of the problems of the multi-screen display system according to the conventional technology as described above, and it is possible to selectively display only a plurality of programs desired by a receiver on one screen at the same time. To provide a digital signal receiving device, a digital signal processing device, and a program recording medium.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a first present invention (corresponding to claim 1) provides a transport system in which a plurality of programs identified by a packet identification number (PID) are multiplexed according to a high efficiency coding system. PID filter means for receiving a stream input, separating a plurality of programs for each PID from the transport stream, and outputting the same as payload data, and different streams for the respective payload data depending on the PID. Stream identification number changing means for generating one packetized elementary stream (PES) by giving an identification number, and TS conversion for reconfiguring the PES into a transport packet having a new one PID a digital signal receiving apparatus characterized by comprising a means.
[0012]
Further, a second present invention (corresponding to claim 2) receives an input of a transport stream obtained by multiplexing a plurality of programs identified by a packet identification number (PID) in accordance with a high efficiency coding method,
PID filter means for separating a plurality of programs for each PID from the transport stream and outputting the same as payload data;
Stream identification number changing means for generating one packetized elementary stream (PES) by assigning a different stream identification number to each of the payload data according to the PID;
A digital signal receiving apparatus according to a first aspect of the present invention, further comprising PS conversion means for reconstructing the PES into one program stream including a plurality of subprograms .
[0013]
A third invention (corresponding to claim 3) is the digital signal receiving apparatus according to the first or second invention, wherein the high-efficiency encoding is based on MPEG2.
[0014]
Further, a fourth invention (corresponding to claim 4 ) provides, for each of the stream identification numbers included in the signal generated by the digital signal receiving apparatus according to any one of the first to third inventions, Decoding means for performing independent decoding;
A digital signal processing device comprising: a display processor for arranging the decoding result for each of the stream identification numbers on the same screen .
[0015]
A fifth aspect of the present invention (corresponding to claim 5 ) is to allow a computer to execute all or a part of the functions of each means or each part of the digital signal receiving apparatus according to any one of the first to third aspects of the present invention. A program recording medium characterized by recording the above program .
[0017]
According to a sixth aspect of the present invention (corresponding to claim 6 ), a program for causing a computer to execute all or a part of the function of each means or each section of the digital signal processing apparatus of the fourth aspect of the present invention is recorded. A program recording medium characterized by the following.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration of a digital signal receiving device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 11 denotes a PID filter unit for dividing a transport packet for each PID, 12 denotes a stream ID replacement unit for newly reassigning a stream ID to a plurality of signals after PID filtering, and 13 denotes a stream ID replacement unit. A buffer memory for temporarily storing the output of the means, 14 a video decoding means for receiving the output of the buffer memory and decoding a video signal according to MPEG2, 15 a decoding memory used by the video decoding means 14, and 16 an output of the video decoding means Is a display processor for reducing the size of the image and arranging it at an arbitrary position on the screen. Reference numeral 17 denotes control means for controlling the entire functional block constituted by these means, and is generally realized by a device-incorporated control microcomputer or the like.
[0019]
In the figure, a signal 100 is an input transport stream, 101 is a plurality of PES signals after PID filtering, 102 and 103 are PES data which are input signals to the buffer memory and output signals from the buffer memory 13, respectively. Denotes a data request signal from the video decoding means 14 to the buffer memory 13, 105 denotes a video decoding result output signal, and 106 denotes a video baseband signal forming a multi-screen constituted by a display processor.
[0020]
Next, FIG. 2 to FIG. 4 are explanatory diagrams showing the definition of the bit stream sequence of the PES signal defined by MPEG2. In the figure, the bit stream sequence is represented as a program function, but each “row” corresponds to a physical bit sequence, and indicates a hardware bit stream state.
[0021]
The digital signal receiving apparatus according to Embodiment 1 of the present invention configured as described above will be described with reference to FIGS.
[0022]
First, for simplicity, in FIG. 1, the input transport stream 100 is one transport stream in which four video signals having packet identification signals (PIDs) of PID1, PID2, PID3, and PID4 are multiplexed. Assume. Further, in order to represent a hexadecimal number, it is expressed as 0xAA in the future. 0xAA represents “1010 1010” in binary and “170” in decimal.
[0023]
The control means 17 detects, from a user input or the like, that the four video signals (programs) of PID1, PID2, PID3, and PID4 are to be multi-displayed from the input transport stream 100 from a user input or the like, and the PID filter means 11 outputs the PID1, PID2, The transport stream (TS) packet to which PID3 and PID4 are assigned is set to be filtered.
[0024]
Upon receiving the input transport stream 100, the PID filter means 11 filters the four types of TS packets of PID 1, PID 2, PID 3, and PID 4 and outputs them as PES signals 101 to the stream ID changing means 12.
[0025]
When receiving the four PES signals 101, the stream ID reassigning means 12 reassigns the stream IDs contained in the respective PES signals to stream IDs = 0xE0, 0xE1, 0xE2, and 0xE3, and converts the stream IDs into one PES format. Output a stream.
[0026]
At this time, the stream ID changing means 12 converts the data into a PES data format to which a PES header is added for each information amount corresponding to one transport stream (TS) packet. That is, the PES data 102 output from the stream ID reassigning means 12 is packet information out of the bit information shown in FIGS. start code prefix (24 bits), stream id (8 bits), PES packet length (16 bits), PES packet data Byte, stream id takes a value of 0xE0 to 0xE3. However, when the TS packets constituting the input transport stream 100 originally include a PES header, the PES header information, which is the information originally included therein, is stored and stored in the stream. It is assumed that only the id is converted and output.
[0027]
Next, the PES data 102 output from the stream ID reassigning means 12 is temporarily stored in the buffer memory 13 and input to the video decoding means 14 in accordance with the data request signal 104 from the video decoding means 14. Upon receiving the input of the PES data 102, the video decoding means 14 performs video decoding according to the rules of MPEG2 independently for each of the four stream IDs contained therein, and obtains a decoding result output 105. The obtained decoding result output 105 is output to the display processor 16.
[0028]
When receiving the input of the decoding result output 105, the display processor 16 performs a process so that it can be displayed on the screen. Of the decoding result output 105, the video originally having the stream ID = 0xE0 is reduced from the original size to a quarter size and processed so as to be arranged at the upper left of the screen.
[0029]
Similarly, the video having the stream ID = 0xE1 is reduced to one fourth at the upper right of the screen, the video of the stream ID = 0xE2 is reduced to the lower left, and the video of the stream ID = 0xE3 is reduced to the lower right of the screen. , To be arranged.
[0030]
The processed decoded result output 105 is finally output to the outside of the digital receiving apparatus as a video baseband signal 106.
[0031]
By the above operation, on the screen of the image receiving apparatus (not shown) which receives the input of the video baseband signal 106, the program having PID1 is originally at the upper left, the program having PID2 is at the upper right, and the program having PID3 is at the lower left. , PID4 are displayed in the lower right at the same time in a reduced arrangement. If there is a program to be output on the full screen among the four screens, the display processor 16 outputs the decoding result of the specific stream ID without reducing the size, so that the full screen can be displayed immediately.
[0032]
As described above, according to the digital receiving apparatus in the first embodiment of the present invention, a plurality of predetermined programs are arranged on a multi-screen from a received transport stream in accordance with a PID that can be set on the receiver side. be able to.
[0033]
In the first embodiment, for the sake of explanation, it is assumed that the number of PIDs to be simultaneously processed is four. However, it is obvious that the same effect can be obtained with the present invention even if the number of PIDs is larger or smaller. As another embodiment, 9 or 16 division is used.
(Embodiment 2)
Hereinafter, a digital signal receiving apparatus according to Embodiment 2 of the present invention will be described. The digital signal receiving apparatus according to the second embodiment has the same configuration as that of the first embodiment, and has the same operation as that of the first embodiment except that the operation of the video decoding unit 14 is different. Is what you do. Therefore, FIG. 1 is used for the description as in the case of the first embodiment. Hereinafter, the operation of the digital signal receiving apparatus according to the second embodiment will be described focusing on the operation of the video decoding means 14.
[0034]
First, as in the first embodiment, the input transport stream 100 is a transport stream in which four video signals having PIDs of PID1, PID2, PID3, and PID4 are multiplexed, respectively. The replacement means 12 and the buffer memory 13 perform exactly the same operation as in the first embodiment.
[0035]
Next, the operation of the video decoding means 14 will be described.
[0036]
Upon receiving the input of the PES data 103, the video decoding means 14 performs video decoding according to the rules of MPEG2 independently for each stream ID included in the PES data 103, in this case. , Decodes only the I picture specified by MPEG2, which constitutes the PES data, and skips the P picture and the B picture which are the other constituent elements so that decoding and screen display are not performed.
[0037]
Lastly, the display processor 16 performs a process for reducing and arranging the screen on the decoded result output 105 obtained as described above, in which only the I picture is decoded, as in the first embodiment.
[0038]
This eliminates the need to place reference images corresponding to a plurality of stream IDs in the decoding memory 15, thereby enabling decoding of a plurality of programs with a reduced decoding memory capacity.
[0039]
As described above, according to the digital signal receiving apparatus of the second embodiment, it is possible to perform multi-segment display of a screen in a configuration in which the number of decoding memories is reduced.
(Embodiment 3)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing a configuration of a digital signal receiving device according to Embodiment 3 of the present invention. 5, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. Reference numeral 34 denotes a video decoding unit that receives an output of the buffer memory and decodes a video signal according to MPEG2, and 35 denotes an image size conversion unit that up-samples or down-samples the output of the video decoding unit. Reference numeral 37 denotes control means for controlling these functional blocks as a whole, and is generally realized by a control microcomputer incorporated in a device.
[0040]
In the figure, a signal 300 is an input transport stream, 301 is a plurality of PES signals after PID filtering, 302 and 303 are PES data, 304 is a data request signal from the video decoding means to the buffer memory, and 305 is a video decoding result. The video baseband signals respectively correspond to the input transport stream 100, the PES signal 101, the PES data 102 and 103, the data request signal 104, and the video baseband signal 106 in the first embodiment.
[0041]
The digital signal receiving apparatus according to Embodiment 3 configured as described above will be described with reference to FIG.
[0042]
First, the input transport stream 300 is a transport stream in which four video signals having PIDs of PID1, PID2, PID3, and PID4 are multiplexed, respectively, and includes a PID filter unit 1, a stream ID changing unit 12, a buffer memory 13 Performs exactly the same operation as in the first embodiment.
[0043]
Next, the operation of the video decoding means 34 and subsequent operations will be described.
[0044]
When receiving the input of the PES data 303, the video decoding means 34 performs video decoding in accordance with the rules of MPEG2 independently for each stream ID included in the PES data 303 as in the first embodiment. The stored reference image is transferred to the image size converter 35 before being stored in the decoding memory 36.
[0045]
Upon receiving the input of the reference image obtained by the decoding, the image size converting means 35 down-samples the reference image to the original half size in the horizontal and vertical directions. On the other hand, when reading out the reference image from the decoding memory 36, upsampling is performed twice as large as the original size in each of the horizontal and vertical directions.
[0046]
Further, when outputting the decoding result as the video baseband signal 305, the image size conversion means 35 does not perform the upsampling operation at the time of reading, and outputs the reduced image stored in the decoding memory 15 as it is.
[0047]
This allows simultaneous decoding of four programs while keeping the frame memory size in the decoding memory 36 small.
[0048]
As described above, according to the digital signal receiving apparatus of the third embodiment, it is possible to perform multi-segment display of a screen in a configuration in which the size of the decoding memory is reduced.
[0049]
Although it is assumed in the third embodiment that the number of PIDs to be simultaneously processed is four for the sake of explanation, the present invention can obtain the same effect when the number of PIDs is larger or smaller.
[0050]
Further, when the video decoding means 34 performs the inverse discrete cosine transform, only the low-order coefficient of the IDCT coefficient may be calculated, and the high-order coefficient may be regarded as “0”, and the calculation therefor may be omitted. In this case, since the wide area of the decoding result can be removed, it is possible to prevent aliasing noise when the reference image data is stored in the decoding memory, and to reduce the total amount of calculation for the decoding operation. .
(Embodiment 4)
Hereinafter, a digital signal receiving apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing a configuration of a digital signal receiving apparatus according to Embodiment 4 of the present invention. 6, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. Reference numeral 43 denotes TS conversion means for converting the output of the stream ID replacement means 12 to a transport stream, and reference numeral 44 denotes PS conversion means for converting the output of the stream ID replacement means 12 to a program stream. Reference numeral 45 denotes control means for controlling the entirety of these functional blocks, and is generally realized by a control microcomputer incorporated in a device.
[0051]
In the figure, a signal 400 is an input transport stream, and 401 is a plurality of PES signals after PID filtering, and correspond to the input transport stream 100 and the PES signal 101 in the first embodiment, respectively. Reference numeral 402 denotes PES data output from the stream ID changing means, 403 denotes a transport stream to be output, and 404 denotes a program stream to be output.
[0052]
The digital signal receiving apparatus according to Embodiment 4 configured as described above will be described with reference to FIG.
[0053]
First, as in the first embodiment, the input transport stream 400 is a transport stream in which four video signals having PIDs of PID1, PID2, PID3, and PID4 are multiplexed, respectively. The replacement means 12 performs exactly the same operation as in the first embodiment.
[0054]
Next, the operation of the TS converter 43 and the PS converter 44 will be described.
[0055]
Upon receiving the input of the PES data 402 output from the stream ID reassigning means 12, the TS converting means 43 adds a 4-byte transport packet header defined by MPEG2 to each of 184 bytes, and adds 188 bytes. Is converted into a transport stream composed of the transport packets.
[0056]
In the same manner as described above, upon receiving the input of the PES data 402 output from the stream ID reassigning means 12, the PS conversion means 44 converts this into a program stream defined by MPEG2 and outputs it.
[0057]
As a result, from the transport stream multiplexed with a plurality of PIDs, a transport stream or a program stream of one PID multiplexed with one PID and a stream ID is output.
[0058]
Generally, when a digital stream is recorded on a recording medium such as a magnetic tape or a magnetic or optical disk medium, a transport stream or a program stream is used. However, according to the digital signal receiving apparatus of the fourth embodiment, a plurality of PIDs are used. Is converted into a 1PID transport stream or a program stream and output, so that a plurality of programs can be simultaneously recorded even in a device having a recording format in which only one program, that is, only one PID, can be simultaneously recorded. Can be made possible.
[0059]
In addition, a digital signal processing device that receives a transport stream or a program stream obtained by the digital signal receiving device according to the present embodiment and displays a plurality of programs may be used as a pair. This is provided with the video decoding means, the decoding memory, and the display processor according to any one of the first to third embodiments of the present invention. Multi-segment display is possible.
[0060]
In each of the embodiments of the present invention, the description has been given assuming that the high-efficiency coding method conforms to MPEG2. However, the present invention is not limited to this. May be used.
[0061]
The stream ID changing means in the embodiment of the present invention corresponds to the stream identification number adding means in the present invention, and the video decoding means, the decoding memory and the image size converting means in the embodiment of the present invention Corresponds to the decoding means of the present invention.
[0062]
Also, in any of the embodiments of the present invention, the operation of the digital signal receiving device and the digital signal processing device has been described as being realized as hardware, but this is achieved by the operation of a program using a computer. Alternatively, it may be realized by software.
[0063]
Further, in any of the embodiments of the present invention, the digital signal receiving apparatus and the digital signal processing apparatus of the present invention have been mainly described. A recording medium that stores a program that causes a computer to execute all or a part of each step or each step may be used.
[0064]
【The invention's effect】
As is apparent from the above description, according to the present invention, by arranging the decoded output at an arbitrary position on the screen, it is possible to simultaneously display a plurality of programs set on the receiving side. There is an effect that a signal receiving device, a digital signal processing device, and a program recording medium can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram of a digital signal receiving apparatus according to Embodiments 1 and 2 of the present invention. FIG. 2 is an explanatory diagram (1) showing a definition of a bit stream sequence of a PES signal defined by MPEG2.
FIG. 3 is an explanatory diagram (2) showing the definition of a bit stream sequence of a PES signal defined by MPEG2.
FIG. 4 is an explanatory diagram (3) showing the definition of a bit stream sequence of a PES signal defined by MPEG2.
FIG. 5 is a block diagram of a digital signal receiving device according to a third embodiment of the present invention; FIG. 6 is a block diagram of a digital signal receiving device according to a fourth embodiment of the present invention; FIG. Block diagram for explaining the operation of [Description of reference numerals]
11, 91 PID filter means 12 Stream ID reassignment means 13, 92 Buffer memories 14, 34, 93 Video decoding means 15, 94 Decoding memory 16 Display processor 17, 37, 45, 95 Control means 43 TS conversion means 44 PS conversion means

Claims (6)

In accordance with the high-efficiency coding method, receiving a transport stream obtained by multiplexing a plurality of programs identified by a packet identification number (PID),
PID filter means for separating a plurality of programs for each PID from the transport stream and outputting the same as payload data;
Stream identification number changing means for generating one packetized elementary stream (PES) by assigning a different stream identification number to each of the payload data according to the PID;
A digital signal receiving apparatus comprising: TS conversion means for reconstructing the PES into a transport packet having one new PID. In accordance with the high-efficiency coding method, receiving a transport stream obtained by multiplexing a plurality of programs identified by a packet identification number (PID),
PID filter means for separating a plurality of programs for each PID from the transport stream and outputting the same as payload data;
Stream identification number changing means for generating one packetized elementary stream (PES) by assigning a different stream identification number to each of the payload data according to the PID;
A digital signal receiving apparatus comprising: PS conversion means for reconstructing the PES into one program stream including a plurality of subprograms. The high efficiency coding, the digital signal receiving apparatus according to claim 1 or 2, characterized in that it is compliant MPEG2. Decoding means for independently decoding a signal generated by the digital signal receiving device according to any one of claims 1 to 3 for each stream identification number included therein.
A digital signal processing device, comprising: a display processor for arranging the decoding result for each of the stream identification numbers on the same screen. Program recording medium characterized by recording a program for executing the whole or a computer part of the functions of each means or components of the digital signal receiving device according to any one of claims 1 to 3. A program recording medium on which a program for causing a computer to execute all or a part of the function of each means or each part of the digital signal processing device according to claim 4 is recorded.

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