JP2001094901A - Digital signal receiver, digital signal processing unit and program recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To layout a plurality of programs selected by a digital signal receiver on one screen through reduction and divisions in the digital signal receiver, that receives a transport stream standardized in compliance with MPEG2. SOLUTION: This digital signal receiver is provided with a PID filter means 11, that selects a desired packet identification number from a signal consisting of programs distinguished by a plurality of packet identification numbers, a stream ID replacement means 12 that provides a plurality of stream IDs to the selected signal, a video decode means 14 that applies decode processing to each stream ID, and a display processor 16 that reduces the output of the video decode means to layout them at an arbitrary position. Thus, multi-screen display for a plurality of programs set by the receiver side is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a digital signal receiving apparatus that receives, decodes, and displays a bit stream encoded based on MPEG2.

[0002]

2. Description of the Related Art In recent years, MPEG2 (Moving Picture Exp
Due to international standardization (registered in ISO / IEC 13818) of erts Group phase 2), a transmission / reception system using digital high-efficiency coding has been put to practical use. By using the MPEG2 encoding 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 practically difficult for a user to instantly select a program desired to be viewed.

[0003] As one method for solving this problem, 1
There is a use of a multi-screen in which a plurality of program videos are reduced and arranged and displayed on one screen. The multi-screen allows the user to visually select a desired program.

Hereinafter, a conventional multi-screen display system will be described. FIG. 7 is a block diagram showing a configuration of a conventional multi-screen display system.

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; Reference numeral 93 denotes a video decoding unit that performs video decoding according to the MPEG2 standard, 94 denotes a decoding memory used by the video decoding unit, and 95 denotes a control unit that controls the PID filter unit 91 and the video decoding unit 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.

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 control. 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. PID
The output 901 of the filter means 91 is
, A data request signal 90 from the video decoding means.
3, the PES data 902 is output.

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. As for the video signal 904, one screen is, for example, 1
Since the screen is composed of a multi-channel screen such as a six-part screen, the user can view the multi-channel screen.

[0008]

The multi-screen display system according to the prior art is as described above. However, in such a configuration, the multi-screen is based only on a specific program determined by the transmitter. Therefore, such a multi-screen does not always include the program expected by the receiver.

Further, visually, one screen is most likely to be divided into about 16 divisions, and displaying more than one simultaneous program does not make sense. Therefore, in the current broadcasting format exceeding 100 channels, the number of programs that can be multi-displayed simultaneously is limited. There is a problem that there is a limitation.

The present invention has been made in view of the above-described problems of the conventional multi-screen display system, and selectively displays only a plurality of programs desired by a receiver on one screen at the same time. It is an object of the present invention to provide a digital signal receiving device, a digital signal processing device, and a program recording medium that can perform the operations.

[0011]

To achieve the above object, a first invention (corresponding to claim 1) comprises a plurality of packets identified by a packet identification number (PID) according to a high-efficiency coding method. Of the plurality of programs, and receives all or a part of the plurality of programs from each of the PIs from the transport stream.
P that is separated for each D and output as payload data
ID filter means, and stream identification number assigning means for generating one packetized elementary stream (PES) by assigning different stream identification numbers to the respective payload data in accordance with the PIDs, Decoding means for independently decoding the PES for each stream identification number included therein, and a display processor for arranging the decoding results for each of the stream identification numbers on the same screen. A digital signal receiving apparatus.

Further, the second invention (corresponding to claim 2)
The display processor according to the first aspect of the present invention is characterized in that the display processor reduces the decoding result for each stream identification number at a predetermined reduction rate.

Further, the third invention (corresponding to claim 3)
Is a digital signal receiving apparatus according to the first or second aspect of the present invention, wherein the high-efficiency encoding is based on MPEG2.

A fourth aspect of the present invention (corresponding to claim 7)
Is a packet identification number (P
PID filter means for receiving an input of a transport stream obtained by multiplexing a plurality of programs identified by IDs, separating the plurality of programs into respective PIDs from the transport stream, and outputting the separated programs as payload data; A 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 in accordance with the PID; A digital signal receiving apparatus comprising: TS conversion means for reconstructing a transport packet having one new PID.

A fifth aspect of the present invention (corresponding to claim 10)
Decoding means for independently decoding a signal generated by the digital signal receiving apparatus of the fourth invention 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.

A sixth aspect of the present invention (corresponding to claim 11)
Is a program recording medium on which a program for causing 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 the first to fourth aspects of the present invention is recorded.

The seventh invention (corresponding to claim 10)
Is a program recording medium on which a program for causing a computer to execute all or a part of the functions of each means or each part of the digital signal processing device of the fifth invention is recorded.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of a digital signal receiving apparatus 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.
A buffer memory for temporarily storing the output of the reordering means, a video decoding means for receiving the output of the buffer memory and decoding a video signal in accordance with MPEG2, a decoding memory used by the video decoding means, and a video decoding means Is a display processor that reduces the output of the image and arranges 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.

In the figure, a signal 100 is an input transport stream, 101 is a plurality of PES signals after PID filtering, and 102 and 103 are PESs which are input signals to the buffer memory and output signals from the buffer memory 13, respectively. Data 104, a data request signal from the video decoding means 14 to the buffer memory 13, 105 a video decoding result output signal, and 106 a video baseband signal forming a multi-screen constituted by a display processor.

Next, FIGS. 2 to 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.

The digital signal receiving apparatus according to Embodiment 1 of the present invention configured as described above will be described with reference to FIG.
2 will be described.

First, for the sake of simplicity, in FIG.
It is assumed that one transport stream in which four video signals having packet identification signals (PID) of 1, PID2, PID3, and PID4 are multiplexed. In the future, in order to represent hexadecimal numbers, they are represented as 0xAA. 0xAA is "1010 1010" in binary,
The decimal number represents "170".

The control means 17 outputs PID1, PID2, PID3, PID from the input transport stream 100.
The multi-display of the four video signals (programs) of ID4 is detected from a user input or the like, and PID filter means 11
, The transport stream (TS) packet to which PID1, PID2, PID3, and PID4 are assigned is set to be filtered.

Upon receiving the input of the input transport stream 100, the PID filter means 11
Four types of TS packets of ID1, PID2, PID3, and PID4 are filtered, and the PES signal 101
And outputs the stream ID to the stream ID changing means 12.

When receiving the four PES signals 101, the stream ID reassigning means 12 replaces the stream IDs contained in each of the PES signals with the stream ID =
It is reassigned to 0xE0, 0xE1, 0xE2, and 0xE3, and outputs one PES format stream.

At this time, the stream ID changing means 12
Converts the data into a PES data format in 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 the 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 by
te, stream id is 0xE0 to 0xE
Take the value of 3. 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 contained therein, is stored and the stream is stored. It is assumed that only the id is converted and output.

Next, the PES data 102 output from the stream ID changing means 12 is temporarily stored in the buffer memory 13 and input to the video decoding means 14 according to 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 included in the PES data 102, and obtains a decoding result output 105. The obtained decoding result output 105 is output to the display processor 16.

When the display processor 16 receives the input of the decoding result output 105, it performs processing 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.

Similarly, an image composed of stream ID = 0xE1 is also reduced to a quarter, and
The video of stream ID = 0xE2 is the lower left, stream I
The image of D = 0xE3 is processed to be reduced and arranged at the lower right of the screen.

Each decoded result output 10
5 is finally output as a video baseband signal 106 to the outside of the digital receiving apparatus.

By the above operation, on the screen of the image receiving apparatus which receives the input of the video baseband signal 106 (not shown), the program having the original PID 1
The program with PID3 is in the upper right, the program with PID3 is in the lower left,
The programs having 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 it, so that the full screen can be displayed immediately.

As described above, according to the digital receiving apparatus of the first embodiment of the present invention, a plurality of predetermined programs are converted from a transport stream to be received into a multi-screen according to a PID that can be set on the receiver side. Can be arranged.

In the first embodiment, for the sake of explanation, it is assumed that the number of PIDs to be simultaneously processed is four.
It is obvious that the present invention can obtain the same effect when the number of PIDs is larger or smaller, and 9 or 16 division is used as another embodiment. (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, the description includes
FIG. 1 is used 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.

First, as in the first embodiment, the input transport stream 100 includes PID1 and PID1, respectively.
A transport stream in which four video signals having PIDs of ID2, PID3, and PID4 are multiplexed,
ID filter means 11, stream ID change means 12,
The buffer memory 13 performs exactly the same operation as in the first embodiment.

Next, the operation of the video decoding means 14 will be described.

The video decoding means 14 according to the first embodiment
Similarly, when the input of the PES data 103 is received,
Independently for each stream ID included in this, MPEG
Video decoding is performed in accordance with the rule of P.2. At this time, only the I picture, which composes the PES data and is defined by MPEG2, is decoded.
Pictures and B-pictures are skipped so that decoding and screen display are not performed.

Finally, the display processor 16 processes the decoded result output 105 obtained as described above, in which only the I-picture is decoded, for reduction and screen layout in the same manner as in the first embodiment. I do.

This eliminates the need for placing 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.

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, Embodiment 3 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 apparatus 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.

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,
Reference numeral 304 denotes a data request signal from the video decoding means to the buffer memory, and reference numeral 305 denotes a video baseband signal as a result of video decoding.
00, PES signal 101, PES data 102 and 1
03, data request signal 104, video baseband signal 1
06.

The digital signal receiving apparatus according to the third embodiment configured as described above will be described with reference to FIG.

First, the input transport stream 300 includes PID1, PID2, PID3, and PID, respectively.
This is a transport stream in which four video signals having a PID of ID4 are multiplexed.
The stream ID changing means 12 and the buffer memory 13
The operation is exactly the same as that of the first embodiment.

Next, the operation of the video decoding means 34 and subsequent operations will be described.

The video decoding means 34 according to the first embodiment
Similarly, when the input of the PES data 303 is received,
Independently for each stream ID included in this, MPEG
Video decoding is performed in accordance with Rule 2. The reference image obtained by the decoding is transferred to the image size conversion means 35 before being stored in the decoding memory 36.

Upon receiving the input of the reference image obtained by the decoding, the image size conversion means 35 downsamples 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 to twice the original size in the horizontal and vertical directions.

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,
The reduced image stored in the decoding memory 15 is output as it is.

As a result, it is possible to simultaneously decode four programs while keeping the frame memory size in the decoding memory 36 small.

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.

It is assumed in the third embodiment that the number of PIDs to be simultaneously processed is four for the sake of explanation.
In the present invention, the same effect can be obtained regardless of whether the number of PIDs is more or less.

Also, when the video decoding means 34 performs the inverse discrete cosine transform, only the lower order coefficients of the IDCT coefficients are calculated, and the higher order coefficients are regarded as "0" and the calculation therefor is omitted. Is also good. 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 it is possible to reduce the total calculation amount for the decoding operation. . (Embodiment 4) A digital signal receiving apparatus according to Embodiment 4 of the present invention will be described below 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 44, 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 these functional blocks as a whole, and is generally realized by a device-incorporated control microcomputer or the like.

In the figure, a signal 400 is an input transport stream, 401 is a plurality of PES signals after PID filtering, and the input transport stream 100 and the PES signal 101 in the first embodiment, respectively.
Is equivalent to Furthermore, 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.

A digital signal receiving apparatus according to Embodiment 4 configured as described above will be described with reference to FIG.

First, similarly to the first embodiment, the input transport stream 400 includes PID1 and PID1, respectively.
A transport stream in which four video signals having PIDs of PID2, PID3, and PID4 are multiplexed,
PID filter means 1, stream ID changing means 12
Performs exactly the same operation as in the first embodiment.

Next, the operation of the TS converter 43 and the PS converter 44 will be described.

Upon receiving the input of the PES data 402 output from the stream ID changing means 12, the TS conversion means 43 adds a 4-byte transport packet header defined by MPEG2 to each of the 184 bytes. 188 bytes of the transport stream.

As described above, the PS conversion means 44
Upon receiving the input of the PES data 402 output from the stream ID reassigning means 12, the PES data 402 is converted into a program stream defined by MPEG2 and output.

Thus, from the transport stream multiplexed with a plurality of PIDs, a transport stream or a program stream of one PID multiplexed by one stream ID is output.

In general, 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, but according to the digital signal receiving apparatus of the fourth embodiment, By converting a transport stream of a plurality of PIDs into a transport stream or a program stream of one PID and outputting the converted stream,
Simultaneous recording of a plurality of programs can be made possible even for a device having a recording format that allows recording of only one program, that is, one PID simultaneously.

Further, a digital signal processing device for receiving a transport stream or a program stream obtained by the digital signal receiving device of the present embodiment and displaying 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.
Even with the filter means, it is possible to display a screen in multiple divisions and multiples.

In each of the embodiments of the present invention, the description has been made assuming that the high-efficiency coding method conforms to MPEG2. However, the present invention is not limited to this. An encoding method may be used.

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 in the embodiment of the present invention. The conversion means corresponds to the decoding means of the present invention.

In each of the embodiments of the present invention, the operation of the digital signal receiving apparatus and the digital signal processing apparatus has been described as being realized by hardware. May be implemented by software.

In each of the embodiments of the present invention, the digital signal receiving device and the digital signal processing device of the present invention have been mainly described. A recording medium that stores a program that causes a computer to execute all or part of the steps, or all or part of each step, may be used.

[0064]

As is apparent from the above description, according to the present invention, a plurality of programs set on the receiving side can be displayed simultaneously by arranging the decoded output at an arbitrary position on the screen. There is an effect that a digital signal receiving device, a digital signal processing device, and a program recording medium that can perform the above are 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 the 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. 7 is a block diagram for explaining the operation of a conventional digital signal receiving apparatus.

[Explanation of symbols]

 11, 91 PID filter means 12 Stream ID changing means 13, 92 Buffer memory 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 (12)

[Claims] An input of a transport stream obtained by multiplexing a plurality of programs distinguished by a packet identification number (PID) in accordance with a high-efficiency coding method, and receiving all of the plurality of programs from the transport stream Or PID filter means for separating a part for each PID and outputting the same as payload data; and assigning different stream identification numbers to the respective payload data in accordance with the PID to obtain one packetization Do Elementary Stream (P
ES) for generating a stream identification number; decoding means for independently decoding the PES data for each of the stream identification numbers included therein; and decoding results for each of the stream identification numbers. And a display processor for arranging the digital signal on a screen. 2. The digital signal receiving apparatus according to claim 1, wherein the display processor reduces the decoding result for each stream identification number at a predetermined reduction rate. 3. The digital signal receiving apparatus according to claim 1, wherein the high-efficiency encoding is based on MPEG2. 4. The decoding means according to claim 1, wherein:
3. The digital signal receiving apparatus according to claim 1, wherein only the I picture specified by MPEG2 is decoded. 5. The PES data according to claim 1, wherein said decoding means decodes said PES data such that said decoding result is reduced at a predetermined reduction rate. Digital signal receiver. 6. The digital signal receiving apparatus according to claim 5, wherein said decoding means calculates only low frequency components when performing inverse DCT calculation. 7. A transport stream obtained by multiplexing a plurality of programs identified by a packet identification number (PID) in accordance with a high-efficiency coding scheme, and receiving a plurality of programs from the transport stream. PID filter means for separating each PID and outputting the same as payload data; and assigning different stream identification numbers to the respective payload data in accordance with the PIDs to provide one packetized elementary stream (P
A digital signal receiving apparatus comprising: stream identification number changing means for generating ES); and TS converting means for reconstructing the PES into a transport packet having one new PID. 8. A transport stream obtained by multiplexing a plurality of programs identified by a packet identification number (PID) in accordance with a high-efficiency encoding method, and receiving a plurality of programs from the transport stream. PID filter means for separating each PID and outputting the same as payload data; and assigning different stream identification numbers to the respective payload data in accordance with the PIDs to provide one packetized elementary stream (P
A digital signal receiving apparatus comprising: stream identification number changing means for generating ES); and PS conversion means for reconstructing the PES into one program stream including a plurality of subprograms. 9. The digital signal receiving apparatus according to claim 1, wherein the high-efficiency encoding is based on MPEG2. 10. A decoding means for independently decoding a signal generated by the digital signal receiving apparatus according to claim 7 for each stream identification number included therein, and said individual stream identification. A digital signal processing device comprising: a display processor for arranging decoding results for each number on the same screen. 11. A program recording program for causing a computer to execute all or a part of the function of each means or each part of the digital signal receiving device according to claim 1. Medium. 12. 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 10 is recorded.