JP2007142536A - Data modifying device, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data modifying device capable of mixing an error by modifying data transferred in a time series. <P>SOLUTION: Sorting conditions of a TS packet are designated to a TS packet condition sorting processing section 52, and a TS packet where the modification of data is desired is selected from the TS packets for composing a TS outputted from a personal computer 30. Modification conditions of the data in the TS packet are designated to data modification processing sections 53a-53n in each packet, and data of the TS packet are modified. A delay time is designated to respective delay processing sections 54, 55a-55n, jitter is allowed to occur in the TS packet, and the order of the TS packets outputted from the personal computer 30 is changed. In this manner, the data modifying device enables a user to modify the data of TS inputted from the outside appropriately for outputting outside. In this case, the creation of error data by modifying the data of TS means the mixing of the error to TS. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a data modification device, a program, and a recording medium, and more particularly, a device for modifying data transferred in time series, a program for causing a computer system to function to realize the data modification device, and the program The present invention relates to a computer-readable recording medium on which is recorded.

  In recent years, compression coding by MPEG (Moving Picture Experts Group) 2 in broadcasting media such as satellite digital broadcasting such as BS (Broadcasting Satellite) digital broadcasting and CS (Communication Satellite) digital broadcasting, terrestrial digital broadcasting, CATV (CAble TeleVision), etc. Digital broadcasting services using technology are provided.

  In the MPEG2 system, which is a compression encoding system using MPEG2, an ES (Elementaly Stream) that is a bit stream of data obtained by compression encoding audio data (audio information) and video data (video information) is generated, and the audio data ES (audio ES) and video data ES (video ES) are multiplexed to generate PS (Program Stream) or TS (Transport Stream).

Here, the ES packetized in meaningful units (frame unit for video data and block unit for audio data) is called a PES (Packetized Elementary Stream). The PES includes time information, and video data and audio data can be synchronized using this time information.
PS is a multiple signal format in which PESs are simply arranged and headers are added, and is standardized assuming application to data transmission / storage in an environment where errors do not occur, and may reduce redundancy. Since it is possible, it is used in a recording medium (storage medium) using a strong error correction code such as a DVD.
Since TS can configure multiple programs in one bit stream, it is standardized assuming that it is applied to media such as broadcast media and communication media that cause data transmission errors. Is larger than PS.
PS and TS can be converted into each other.

  One TS is composed of several tens to several hundreds of types of TS packets. The TS packet is a fixed-length packet of 188 bytes or 204 bytes, and its length is taken into consideration for consistency with ATM (Asynchronous Transfer Mode) cell length and applicability when performing error correction coding such as Reed-Solomon code. Has been determined.

  The TS packet includes a 4-byte fixed-length packet header, a variable-length adaptation field (adaptation field), and a payload. There are cases where only one of the adaptation field and the payload is present or both, and the presence or absence is indicated by a flag (adaptation field control) in the packet header.

The packet header includes various packet control data such as PID (Packet IDentification), a synchronization byte, and a continuity index, which are identifiers for identifying the type of TS packet.
The adaptation field includes reference time information (PCR: Program Clock Reference) for achieving synchronization between the transmission side and the reception side, and compression-coded video data or audio data.

The synchronization byte is data indicating the start of a TS packet.
The PID is data indicating the content of information included in the TS packet (channel number, which of video data and audio data of the channel is included, etc.).
Since the same video data and the same audio data have the same PID, the TS receiving system can return to the original PES using the PID.

Then, a transmission system installed in a broadcasting station, a relay station, a CATV station, etc. generates a TS that is a data string of TS packets by time-division multiplexing the TS packets for a plurality of channels thus generated. Since the transmission signal is generated by modulating the TS with a predetermined modulation method and the transmission signal is transmitted to the transmission means, a television program for a plurality of channels can be broadcast simultaneously.
The transmission means for transmitting signals is, for example, a broadcasting satellite for satellite digital broadcasting, an antenna of a receiving device for digital terrestrial broadcasting, or a dedicated communication line for CATV.

In addition, a receiving system that receives digital broadcasting receives a transmission signal transmitted from a broadcasting station, a relay station, a CATV station, or the like, and generates a TS by demodulating the received transmission signal using a predetermined demodulation method. .
Then, the receiving system generates video data and audio data by selecting and decoding TS packets of a channel desired by the user from among TS packets for a plurality of channels included in the TS, and the data is received by the television receiver. Output to the machine and play.

In such digital broadcasting by MPEG2, it is necessary to monitor the occurrence status (occurrence status) of multiple types of errors for individual TS packets generated by the transmission system or the reception system.
This is because, in order to realize normal broadcasting, it is necessary to investigate the cause of the error based on the TS error occurrence state and to take preventive measures so that the error does not occur from the next time.

  Incidentally, the causes of TS errors include, for example, malfunctions of various devices constituting the transmission system or reception system, malfunctions of power supplied to the various apparatuses, imperfect scheduling of television programs, malfunctions in pause timing of broadcasting, There are radio wave interference (rain attenuation, lightning interference, etc.) due to weather.

However, since one TS is composed of several tens to several hundreds of types of TS packets, when the occurrence status of multiple types of errors is monitored for each TS packet, the number of types of errors to be monitored is several thousand to several. There are as many as 10,000 types, and it is impossible to monitor them with human systems.
Therefore, the applicant (Traffic Sim Co., Ltd.) has developed and sold a TS packet monitoring device that monitors the occurrence of errors based on the reception interval time of TS packets identified by PID, interruption of continuity index, etc. (Product name “TS302 / TS Watch'n LV”). This TS packet monitoring apparatus has already been actually used in domestic major digital satellite broadcasting stations, and has contributed to improving the quality of broadcasting services.

In addition, when a data string generated by arranging a plurality of data in a predetermined unit is recorded on a predetermined recording medium, time information addition for adding time information indicating a configuration state to each of the data constituting the data string Means, and each of the data and the time information recorded on the recording medium, and then each of the two pieces of information adjacent to each other along the time axis among the time information reproduced together with the data from the recording medium. Difference value calculation means for calculating a difference value between time information, and error detection means for detecting whether or not an error has occurred in the data to which the time information is added based on the calculation result of the difference value. There has been proposed an error detection device characterized by comprising (see Patent Document 1).
Japanese Patent Laid-Open No. 2003-87734 (pages 2 to 12 and FIGS. 1 to 7)

  When developing the TS packet monitoring device developed and sold by the present applicant and the error detection device disclosed in Patent Document 1, it is necessary to intentionally mix errors into the TS and perform an operation test of the device.

By the way, since TS and communication standards using TS are highly versatile, it is difficult to set clear restrictions on many specifications, so manufacturers and broadcasters of various devices that make up transmission systems and reception systems There are actual situations that are used according to the standards set by each.
Furthermore, TS is often used in communication lines (for example, satellite lines) where it is unavoidable that errors of a certain level or more are mixed. Since it is left to the discretion of the manufacturer of various devices, there are various situations in which an error occurs depending on the manufacturer, model, and lot.

Therefore, manufacturers of various devices investigate the behavior of the devices in response to multiple types of errors in TS, and check whether the behavior meets various broadcasting standards (transmission standards). It is necessary to conduct an error-resistant performance test for each type.
In addition, manufacturers of various devices need to perform a performance test of an error correction function in which the device tests a function for correcting an error of the TS for each error type.

Broadcasters then intentionally mix errors into TS to investigate which broadcast standard should be preferentially protected when designing or adjusting a transmission system. By generating signals and testing what kind of viewing disturbances (broadcasting accidents) occur when the transmission signal is received by the receiving system, grasp the threshold for occurrence of viewing disturbances for each type of error. It is necessary to keep.
In other words, the timing at which a viewing failure that is a problem for the viewer occurs is not always the moment when it deviates from the various broadcasting standards. For this reason, the warning level is defined as a warning level that does not affect the viewer although it deviates from the broadcasting standard, and the error level is defined as a status that affects the viewer (for example, the screen disappears). Broadcasters must broadcast after knowing the warning level and error level thresholds.

  By the way, not only various devices constituting the transmission system and the reception system, but also a device that reproduces a TS recorded on a recording medium, it is necessary to perform various tests as described above for TS errors.

Thus, in order to perform various tests related to TS errors, it is necessary to prepare TS in which a plurality of types of errors are mixed.
For this reason, TS test data mixed with errors has been commercially available, but the commercially available test data is extremely expensive, and the commercially available test data includes all the various errors required by the tester. Therefore, there is a problem that it is difficult for a tester to perform a desired test because an error required by a tester such as a manufacturer of various devices or a broadcasting company cannot be obtained.

The present invention has been made to solve the above-described problems, and has the following objects.
(1) To provide a data modification device capable of mixing a desired error into data by modifying data transferred in time series.
(2) Provided is a program for causing a computer system to function so as to realize the data modification device of (1).
(3) Provided is a computer-readable recording medium on which a program for causing a computer system to function is realized so as to realize the data modification device of (1).

The invention described in claim 1
Modifying means (30) for making error data by modifying data (TS) transferred in time series,
A technical feature of the data alteration device (10) is provided with designation means (31) for designating data alteration to the alteration means.

The invention described in claim 2
In the data modification device (10) according to claim 1,
The data (TS) is composed of a plurality of packets (TS packets),
The modifying means (30)
Packet input timing detection means (51) for detecting input timing for each packet constituting the data;
Packet condition distribution means (52) for distributing the data for each packet in accordance with the specification of the specification means (31);
Intra-packet data modifying means (53a to 53n) for modifying data in each packet distributed by the packet condition distributing means in accordance with the specification of the specifying means (31),
First delay means (54) for delaying both the detection result of the packet input timing detection means (51) and each packet constituting the data by a predetermined delay time in accordance with the designation of the designation means (31) ,
Second delay means (55a to 55n) for delaying each packet modified by the in-packet data modification means (53a to 53n) by a predetermined delay time in accordance with the designation of the designation means (31);
Based on the designation of the designation means (31) and the detection result of the packet input timing detection means (51) transferred via the first delay means (54), output from the modification means (30) Packet output timing generation means (56) for determining the output timing of the packet to be transmitted;
Output packet selection means (57) for selecting one packet from the packets output from the first and second delay means (54, 55a to 55n) according to the output timing determined by the packet output timing generation means. When,
Dummy packet generating means (58) for generating a null packet or a packet including predetermined data as a dummy packet in accordance with the specification of the specifying means (31);
Whether to discard a predetermined packet for the packet selected by the output packet selection means (57) according to the designation of the designation means (31) and the output timing determined by the packet output timing generation means (56) Alternatively, by adding the dummy packet generated by the dummy packet generating means (58), the packet is output from the modifying means (30) in accordance with the output timing determined by the packet output timing generating means (56). A bit rate control means (59),
The delay times of the first delay means and the second delay means are set linked to each other;
The output packet selection means (57) and the bit rate control means (59) generate combined data by combining the packets output from the first and second delay means (54, 55a to 55n). Output as a technical feature.

The invention according to claim 3
In the data modification device according to claim 1 or 2,
It is a technical feature that the data is a TS in MPEG2.

  According to a fourth aspect of the present invention, there is provided a program for causing a computer system to function as each of the means in the data modification device according to any one of the first to third aspects.

  According to a fifth aspect of the present invention, there is provided a computer-readable recording medium in which a program for causing a computer system to function as each means in the data modification device according to any one of the first to third aspects is recorded. It is to provide.

<Claim 1>
According to the first aspect of the present invention, data (TS) input from the outside can be output to the outside after the user of the data modification device (10) modifies it appropriately. Here, altering data is nothing but mixing error into the data to make error data. In other words, the user can modify the data to a desired state by mixing a desired error in the data using the data modifying device.

  Therefore, with respect to various devices constituting the transmission system and the reception system, the manufacturer of the device can easily perform the error resistance performance test and the performance test of the error correction function by using the data modification device of claim 1. .

  In addition, by using the data modification device according to claim 1, the broadcaster investigates which broadcast standard out of various broadcast standards should be protected with priority when designing or adjusting the transmission system. Therefore, what kind of viewing trouble (broadcast accident) occurs when a transmission signal is generated by intentionally mixing data (for example, MPEG2-TS etc.) and the transmission signal is received by the receiving system. When testing, it is possible to easily grasp the threshold value of occurrence of viewing disturbance for each type of error.

  Furthermore, not only for various devices constituting the transmission system and the reception system, but also for devices that reproduce data recorded on a recording medium, the manufacturer of the device uses the data modification device of claim 1 to relate to errors. Various tests can be easily performed.

  If the data modifying device of claim 1 is used, it is possible to mix a desired error in real time with data that is normally transferred, so it is necessary to prepare data including the error in advance. Therefore, the test of various devices can be easily performed.

  In addition, if the data mixed with the error output from the data modification device according to claim 1 is recorded on an appropriate recording medium, the data mixed with the error can be created simultaneously with the test of various devices. Since the created data can be used for testing another device, it is not necessary to purchase expensive commercially available test data.

  In addition, when the data modification device of claim 1 is used, when developing the TS packet monitoring device developed and sold by the present applicant and the error detection device of Patent Document 1, an error is intentionally mixed in the TS. When the operation test is performed, the operation test can be easily performed.

<Claim 2>
According to the invention of claim 2, each packet (TS packet) constituting the transferred data (TS) is divided into first delay processing means (54) → output packet selection means (57) → bit rate control means ( By outputting via the route 59), the transferred data can be passed through without being changed.

  In addition, by specifying the packet distribution conditions ([A] to [D], etc.) using the specifying means (31) by the user of the data modification device (10) to the packet condition distribution means (52), The user can freely select a packet whose data is to be modified from among the packets constituting the data output from the data modification device.

  In addition, the user of the data modification device designates the modification conditions ([a] to [f] etc.) of the data in the packet using the designation unit for the data modification unit (53a to 53n) in the packet, The packet data selected by the packet condition distribution means (52) can be modified as intended by the user.

  In addition, the user-designated packet is designated by the user of the data modification device (10) using the designating means (31) for the first and second delay means (54, 55a to 55n). Jitter can be generated, or the order of packets output from the data modification device can be changed as intended by the user.

<Claim 3>
According to the invention of claim 3, it is possible to modify a TS in MPEG2 and mix a desired error, and the operation and effect of the invention of claim 1 or claim 2 can be obtained.

<Claim 4 and Claim 5>
According to invention of Claim 4, the program for functioning a computer system so that the data modification apparatus of any one of Claims 1-3 may be implement | achieved can be provided.
According to the invention described in claim 5, it is possible to provide a computer-readable recording medium in which the program of claim 4 is recorded.

For example, the program can be recorded by using a ROM or backup RAM as a computer-readable recording medium, and the ROM or backup RAM can be incorporated into a computer system.
In addition, the program is recorded (stored) in an external recording device (external storage device) having a computer-readable recording medium, and the program is loaded from the external recording device to the computer system as necessary. May be used.

<Explanation of terms>
Reference numerals in parentheses described in [Means for Solving the Problems] and [Effects of the Invention] described above are the same as those of the components and components described in [Best Mode for Carrying Out the Invention] described later. It corresponds to the code.
The correspondence between the constituent members and constituent elements described in [Means for Solving the Problems] and [Effects of the Invention] and the constituent members and constituent elements described in [Best Mode for Carrying Out the Invention] is as follows: It is as follows.

The “modifying means” corresponds to the processing operation of each functional block (each processing unit 51 to 59) executed by the personal computer system 30.
The “designating means” corresponds to a processing operation in which an instruction command from a user of the data modification device 10 is converted into a data signal by the input device 31 and the data signal is transferred to the CPU 41 via the I / O 45 of the computer main body 40. To do.
The “packet input timing detection unit” corresponds to the packet input timing detection processing unit 51.
The “packet condition distribution unit” corresponds to the TS packet condition distribution processing unit 52.
The “in-packet data modification means” corresponds to the in-packet data modification processing units 53a to 53n.
The “first delay unit” corresponds to the delay processing unit 54.
The “second delay unit” corresponds to the delay processing units 55a to 55n.
The “packet output timing generation unit” corresponds to the packet output timing generation processing unit 56.
The “output packet selection unit” corresponds to the output packet selection processing unit 57.
The “dummy packet generation unit” corresponds to the dummy packet generation processing unit 58.
The “bit rate control means” corresponds to the bit rate control processing unit 59.

<Overall Configuration of Embodiment>
FIG. 1 is a block diagram showing an overall schematic configuration of a data modification device 10 according to an embodiment embodying the present invention.
The data modification device 10 includes an input / output interface (IF: InterFace) unit 20 and a personal computer system (hereinafter abbreviated as “personal computer”) 30.

The input / output IF unit 20 of DVB-ASI (Digital Video Broadcasting-Asynchronous Serial Interface) standard is connected to the personal computer 30 according to USB (Universal Serial Bus) 2.0 standard.
The input / output IF unit 20 includes an input IF circuit 21, an output IF circuit 22, a timing to data conversion circuit 23, a data to timing conversion circuit 24, and a USB 2.0 IF circuit 25.
In the USB 2.0 IF circuit 25, memories 26 and 27 are provided.

The MPEG2-TS input from the outside is transferred to the USB 2.0 IF circuit 25 via the input / output IF circuit 21 and transferred to the timing-to-data conversion circuit 23.
The timing-to-data conversion circuit 23 generates timing data for outputting a TS based on the input bit rate and timing of the TS, and outputs the timing data to the USB 2.0 IF circuit 25.
The USB 2.0 IF circuit 25 temporarily stores the TS output from the input IF circuit 21 and the timing data output from the timing-to-data conversion circuit 23 in the memory 26, and the TS and timing data read out from the memory 26 are stored in the personal computer. Output to 30.

The USB 2.0 IF circuit 25 temporarily stores the TS and timing data output from the personal computer 30 in the memory 27, outputs the TS read from the memory 26 to the output IF circuit 22, and outputs the timing data read from the memory 26. The data is output to the timing conversion circuit 24.
The data to timing conversion circuit 24 generates a timing for outputting the TS and outputs the timing to the output IF circuit 22.
The output IF circuit 22 outputs the TS read from the memory 27 to the outside in accordance with the timing output from the data to timing conversion circuit 24.

  As described above, the TS and timing data are temporarily stored in the memory 26 or 27, so that the input / output IF unit 20 converts the bit rate of the TS input from the outside in the DVB-ASI standard to the bit of the USB 2.0 standard. The rate is converted to a rate (for example, 480 Mbps), transferred to the personal computer 30, and the TS output from the personal computer 30 at the USB 2.0 standard bit rate is converted to a bit rate conforming to the DVB-ASI standard and output to the outside. be able to.

The personal computer 30 includes a computer main body 40, an input device 31, a display device 32, and the like.
The computer main body 40 includes a central processing unit (CPU) 41, a read-only storage device (ROM) 42, a readable / writable storage device such as a RAM 43 and an HDD (Hard Disk Drive) 44, an input / output device (I / O) 45, and the like. It is comprised by the well-known microcomputer system provided with.

The input device 31 includes, for example, a keyboard and a pointing device, converts an instruction command from the user of the data modification device 10 into a data signal, and converts the data signal to the CPU 41 via the I / O 45 of the computer main body 40. Forward to.
The display device 32 is an LCD (Liquid Crystal Display) or CRT (Cathode Ray).
Tube), and the like. The processing result of the CPU 41 transferred via the I / O 45 of the computer main body 40 is displayed on the display screen to notify the user of the data modification device 10.

<Functional block configuration of personal computer 30>
FIG. 2 is a functional block circuit diagram showing the personal computer 30 of the data modification device 10 shown in FIG. 1 by functional blocks.
When the CPU 41 is activated, the personal computer 30 loads a computer program stored (recorded) in the HDD 44 into the CPU 41, and executes various functional blocks (packet input) shown in FIG. 2 by various arithmetic processes executed by the CPU 41 in accordance with the computer program. Timing detection processing unit 51, TS packet condition distribution processing unit 52, in-packet data modification processing units 53a to 53n, delay processing unit 54, delay processing units 55a to 55n, packet output timing generation processing unit 56, output packet selection processing unit 57 The computer system is caused to function so as to realize the dummy packet generation processing unit 58 and the bit rate control processing unit 59).

  The computer program is not an HDD 44 built in the computer main body 40, but an external recording device (external storage device) (not shown) having a RAM (backup RAM) 43 built in the computer main body 40 and a computer-readable recording medium. The computer program may be loaded into the CPU 41 from the RAM 43 or an external recording device and used as necessary.

  Incidentally, computer-readable recording media include semiconductor memory (smart media, memory stick, etc.), HD (Hard Disk), FD (Floppy Disk), data card (IC card (IC: Integrated Circuit), magnetic card, etc.) ), Optical disks (CD-ROM, DVD, etc.), magneto-optical disks (MO, etc.), phase change disks, magnetic tapes, and the like. By the way, the names of specific examples of the recording medium include registered trademarks.

  The MPEG2-TS output from the input / output IF unit 20 is transferred to the packet input timing detection processing unit 51, the TS packet condition distribution processing unit 52, and the delay processing unit 54, respectively.

  The packet input timing detection processing unit 51 detects the input timing for each TS packet constituting the TS, and outputs it as a parameter for generating the output timing of the TS packet output from the personal computer 30.

The TS packet condition distribution processing unit 52 distributes each TS packet constituting the TS for each TS packet based on the instruction command from the user of the data modification device 10 using the input device 31 based on the instruction commanded condition. .
Here, for example, there are the following conditions for sorting the TS packets instructed by the user.
[A] Value of PID.
[B] A desired 1-byte data value in the TS packet (for example, table id).
[C] A desired data string of a plurality of bytes in the TS packet.
[D] A random value generated by the arithmetic processing executed by the CPU 41.

Each of the intra-packet data modification processing units 53a to 53n applies to each TS packet sorted by the TS packet condition sorting processing unit 52 according to an instruction command from the user of the data modification device 10 using the input device 31. The data in the TS packet is modified based on the instruction commanded condition.
The number of in-packet data modification processing units 53a to 53n may be set according to the number of TS packets distributed by the TS packet condition distribution processing unit 52.

Here, the data modification conditions in the TS packet instructed by the user include, for example, the following.
[A] Value of PID.
[B] Value of continuity index.
[C] Value of DTS (Decoding. Time Stamp) or PTS (Presentation Time Stamp) in PCR or PES (Packetized Elementarty Stream) (in this case, appropriate coefficients are added to, subtracted from, or subtracted from, PCR, DTS, PTS) ).
[D] Replace an appropriate data value with another appropriate 1-byte data value (for example, replace a part of PAT (Program Association Table) data with appropriate data).
[E] Replacing an appropriate data value with another appropriate multi-byte data string.
[F] Replacement with TS packets output in the past from the data modification device 10 (in this case, TS packets output in the past are stored in the intra-packet data modification processing units 53a to 53n).

The delay processing unit 54 is a user of the data modification device 10 using the input device 31 for both the signal output from the packet input timing detection processing unit 51 and each TS packet constituting the TS input to the personal computer 30. Is delayed by the delay time specified by the instruction command.
Each of the delay processing units 55a to 55n is instructed to instruct the TS packet modified by the in-packet data modification processing units 53a to 53n according to the instruction command from the user of the data modification device 10 using the input device 31. Delay by the delay time.

  Each delay processing unit 54, 55a to 55n is configured by a ring memory that stores TS packets once and then reads them at an appropriate timing. By changing the timing for reading TS packets from the ring memory, the delay time is reduced. It can be set appropriately.

The delay times of the delay processing units 54 and 55a to 55n are set so as to be linked to each other. Therefore, by appropriately changing the delay time of each of the delay processing units 54 and 55a to 55n, it is possible to generate jitter in an appropriate TS packet or to appropriately change the order of TS packets output from the personal computer 30. .
The delay processing unit 54 responds to the difference in the time required for processing in each of the processing units 51, 52, 53a to 53n, and the TS packet output from the delay processing unit 54 and each of the delay processing units 55a to 55n. It also has a function to synchronize the timing with the TS packet output from.

The packet output timing generation processing unit 56 outputs the TS packet output timing from the personal computer 30 based on the TS packet output timing generation parameter transferred from the packet input timing detection processing unit 51 via the delay processing unit 54. To decide.
Normally, the packet output timing generation processing unit 56 does not change the output timing generation parameters of the TS packet transferred from the packet input timing detection processing unit 51 via the delay processing unit 54, and does not change the TS in the personal computer 30. The output timing of the TS packet is determined so that the input bit rate and the output bit rate are the same.
However, if the dynamic bit rate of the output timing of the TS packet is instructed by an instruction command from the user of the data modification device 10 using the input device 31, it matches the bit rate instructed to change. The output timing is determined as follows.

  The output packet selection processing unit 57 is controlled according to the output timing determined by the packet output timing generation processing unit 56, and selects one appropriate TS packet from the TS packets output from the delay processing units 54 and 55a to 55n. select.

The dummy packet generation processing unit 58 generates a TS packet including no data (generally called “null packet”) or a TS packet including appropriate data as a dummy packet.
The data included in the dummy packet can be freely set by the user of the data modification device 10 using the input device 31.

The bit rate control processing unit 59 includes switching processing units 59a and 59b.
Each switching processing unit 59a, 59b is controlled according to the output timing determined by the packet output timing generation processing unit 56 and the instruction command from the user of the data modification device 10 using the input device 31.
The switching processing unit 59a discards an appropriate one of the TS packets selected by the output packet selection processing unit 57.
The switching processing unit 59b outputs, from the personal computer 30, TS packets that are not discarded by the switching processing unit 59a among the TS packets selected by the output packet selection processing unit 57, or a dummy packet generated by the dummy packet generation processing unit 58. The packet is output from the personal computer 30.

That is, in the bit rate control processing unit 59, when the delay times of the delay processing units 55a to 55n are different, or the packet output timing generation processing unit 56 sets the input bit rate and output bit rate of the TS to different values. In some cases, packet output timing generation is performed by discarding an appropriate TS packet using the switching processing unit 59a or adding a dummy packet generated by the dummy packet generation processing unit 58 using the switching processing unit 59b. The processing unit 56 matches the output timing of the TS packet determined.
Note that the TS packet to be discarded using the switching processing unit 59a is a null packet originally included in the TS input to the personal computer 30, or a TS specified by the user of the data modification device 10 using the input device 31. Packet.

  In this way, the processing units 57 and 59 generate a TS by combining the TS packets output from the delay processing units 54 and 55a to 55n, and output the TS to the input / output IF unit 20.

<Operation / Effect of Embodiment>
According to this embodiment, the following actions and effects can be obtained.

  [1] Each TS packet constituting the TS input to the personal computer 30 is output to the personal computer 30 by outputting the TS packet through the path of the delay processing unit 54 → the output packet selection processing unit 57 → the bit rate control processing unit 59. You can slew through without changing the TS.

  [2] The user of the data modification device 10 designates the TS packet distribution conditions (such as [A] to [D]) to the TS packet condition distribution processing unit 52 using the input device 31, whereby the personal computer The user can freely select a TS packet whose data is to be modified from among TS packets constituting the TS output from 30.

  [3] For each of the in-packet data alteration processing units 53a to 53n, the user of the data alteration device 10 uses the input device 31 to set the alteration conditions (such as [a] to [f]) of the data in the TS packet. By designating, the data of the TS packet selected as in [2] can be modified as intended by the user.

  [4] For each delay processing unit 54, 55a to 55n, the user of the data modification device 10 designates a delay time using the input device 31, thereby generating jitter in the TS packet designated by the user, The order of TS packets output from the personal computer 30 can be changed as intended by the user.

[5] By using the data modification device 10, TS data input from the outside can be output to the outside after the user appropriately modifies the data.
Here, modifying the TS is nothing but mixing errors into the TS to make error data. In other words, the user can modify the data to a desired state by mixing a desired error in the data using the data modifying device.

FIG. 3A is a block circuit diagram illustrating a usage example of the data modification device 10.
The MPEG2-TS playback device 72 plays back a TS stored in advance on a recording medium (for example, a storage medium such as a DVD or HD) 71.
The modulator 73 modulates the TS reproduced by the MPEG2-TS reproduction device 72 using a digital broadcast modulation method to generate a transmission signal.
The digital broadcast tuner 74 demodulates the transmission signal generated by the modulator 73 to generate a TS, converts the TS into a TV (TeleVision) signal, and outputs it.
The TV monitor 75 converts the TV signal output from the digital broadcast tuner 74 into an image and sound.

In this use example, the data modification device 10 is inserted between the MPEG2-TS playback device 72 and the modulator 73, and an error is caused by modifying the TS reproduced by the MPEG2-TS playback device 72 by the data modification device 10. The TS mixed with the error is transferred to the modulator 73.
Therefore, the user mixes a desired error by modifying the TS using the data modifying device 10, and confirms the mixed result of the error (TS modification result) on the TV monitor 75, thereby providing a digital broadcast tuner 74. The error resistance performance test and the error correction function performance test can be easily performed.

  As shown in FIG. 3B, even when the recording medium 71 and the MPEG2-TS reproducing device 72 are replaced with the MPEG2-TS receiving device 76, the same test as that shown in FIG. Can do.

  [6] Not only the digital broadcast tuner 74 but also various devices constituting the transmission system and the reception system, the manufacturer of the device uses the data modification device 10 to perform an error resistance performance test and an error correction function performance test. It can be done easily.

  In addition, the broadcaster uses the data modification device 10 to investigate which broadcast standard of various broadcast standards should be preferentially protected at the time of designing or adjusting the transmission system. When a transmission signal is generated by intentionally mixing errors into the transmission signal and the transmission signal is received by the receiving system, it is viewed for each error type when testing what kind of viewing disturbance (broadcast accident) occurs. The threshold of failure occurrence can be easily grasped.

  Furthermore, not only for various devices constituting the transmission system and the reception system, but also for devices that reproduce TS recorded on a recording medium, the manufacturer of the device uses the data modification device 10 to perform various types of errors related to TS. The test can be easily performed.

  [7] If the data modification device 10 is used, a desired error can be mixed in real time with a TS that is normally transferred, so there is no need to create a TS including an error in advance. The test of various devices can be easily performed.

  [8] If the TS mixed with an error output from the data modification device 10 is recorded on an appropriate recording medium, it is possible to create the TS mixed with the error simultaneously with the test of various devices. Since the created TS can be used for testing another device, it is not necessary to purchase expensive commercially available test data.

  [9] If the data modification device 10 is used, when developing the TS packet monitoring device developed and sold by the applicant or the error detection device of Patent Document 1, the operation of the device is intentionally mixed with an error in the TS. When performing a test, the operation test can be easily performed.

<Another embodiment>
The present invention is not limited to the above-described embodiment, and may be embodied as follows. Even in this case, the same operation or effect as that of the above-described embodiment can be obtained.

  [1] Although the DVB-ASI standard is used for the input / output IF unit 20 in the above embodiment, any standard may be used as long as the interface can exchange digital data (for example, DVB-SPI (Synchronous Parallel Interface) standard, TTL (Transistor-Transistor Logic) parallel standard, LAN (Local Area Network), etc.).

  In the above embodiment, the USB 2.0 standard is used for connection between the input / output IF unit 20 and the personal computer 30, but additional data such as the bit rate and timing of the MPEG2-TS input from the outside can be transmitted in real time. Any standard may be used as long as it is an interface (for example, IEEE (Institute of Electrical and Electronic Engineers) 1394 standard, PCI (Peripheral Components Interconnect) bus, LAN, etc.).

  [2] By adjusting the bit rate of the TS output from the output IF circuit 22 to the outside to the bit rate of the TS input from the outside to the input IF circuit 21, the circuits 23 and 24 are connected from the input / output IF unit 20 to each other. It can be omitted.

[3] In the above embodiment, the processing units 51 to 59 are realized by software processing by the personal computer 30.
However, the personal computer 30 may be replaced with a device that combines the circuits by providing a circuit having the functions of the processing units 51 to 59 as hardware.

  [4] The present invention is not limited to MPEG2-TS, and may be applied to any data as long as it is data transferred in time series.

1 is a block diagram showing an overall schematic configuration of a data modification device 10 according to an embodiment embodying the present invention. FIG. 3 is a functional block circuit diagram showing the personal computer 30 of the data modification device 10 by functional blocks. FIG. 3A is a block circuit diagram showing an example of use of the data modification device 10. FIG. 3B is a block circuit diagram showing another example of use of the data modification device 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Data modification apparatus 20 ... Input / output IF unit 21 ... Input IF circuit 22 ... Output IF circuit 23 ... Timing to data conversion circuit 24 ... Data to timing conversion circuit 25 ... USB2.0 IF circuit 26, 27 ... Memory 30 ... Personal computer System (PC)
DESCRIPTION OF SYMBOLS 31 ... Input device 32 ... Display apparatus 40 ... Computer main body 41 ... CPU
42 ... ROM
43 ... RAM
44 ... HDD
45 ... I / O
DESCRIPTION OF SYMBOLS 51 ... Packet input timing detection process part 52 ... TS packet condition distribution process part 53a-53n ... In-packet data modification process part 54 ... Delay process part 55a-55n ... Delay process part 56 ... Packet output timing generation process part 57 ... Output packet Selection processing unit 58 ... dummy packet generation processing unit 59 ... bit rate control processing unit 59a, 59b ... switching processing unit

Claims (5)

Modifying means to make error data by modifying data transferred in time series,
A data alteration device comprising: designation means for designating data alteration to the alteration means. The data modification device according to claim 1,
The data is composed of a plurality of packets,
The modification means includes
Packet input timing detection means for detecting input timing for each packet constituting the data;
Packet condition distribution means for distributing the data for each packet in accordance with the specification of the specification means;
In-packet data modifying means for modifying the data in each packet sorted by the packet condition sorting means according to the designation by the designation means;
First delay means for delaying both the detection result of the packet input timing detection means and each packet constituting the data by a predetermined delay time in accordance with the designation of the designation means;
Second delay means for delaying each packet modified by the in-packet data modifying means by a predetermined delay time according to the designation by the designation means;
Packet output timing generation for determining the output timing of the packet output from the modifying means based on the specification of the specifying means and the detection result of the packet input timing detecting means transferred via the first delay means Means,
Output packet selection means for selecting one packet from the packets output from the first and second delay means according to the output timing determined by the packet output timing generation means;
Dummy packet generation means for generating a null packet or a packet containing predetermined data as a dummy packet according to the designation of the designation means;
According to the designation of the designation unit and the output timing determined by the packet output timing generation unit, a predetermined packet is discarded for the packet selected by the output packet selection unit, or the dummy packet generation unit A bit rate control means for outputting the packet from the modifying means in accordance with the output timing determined by the packet output timing generating means by adding the generated dummy packet;
The delay times of the first delay means and the second delay means are set linked to each other;
A data modifying device characterized in that the output packet selecting means and the bit rate control means generate and output data obtained by concatenating and synthesizing the packets output from the first and second delay means. In the data modification device according to claim 1 or 2,
The data modification device according to claim 1, wherein the data is a TS (Transport Stream) in MPEG (Moving Picture Experts Group) 2.   The program for functioning a computer system as said each means in the data modification apparatus of any one of Claims 1-3. The computer-readable recording medium with which the program for functioning a computer system was recorded as said each means in the data modification apparatus of any one of Claims 1-3.

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