JPH1188439A - Ip address value-pid value conversion system, converter therefor and video distribution system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the packet identifier(PID) value of a TS packet after conversion by regulating the system of an IP address from the specified bit of an internet protocol(IP) address value and setting a frequency transmitting data at every IP address system. SOLUTION: A CPU 22 reads the IP packet from a buffer 21, transmits low-order eight bits (Bit:7-0) data 12 of an IP address value to an LUT 23, transmits high-order 24 bits (Bit:31-8) data 13 to the LUT 23 and transmits IP packet data 14 to an IP data part 25. The LUT 23 transmits data 15 obtained by degenerating high-order 24 bit data 13 of the IP address value to five bits to a TS header part 24 and transmits a frequency multiplex destination QAM number data 16 to a switch 26. The TS header part 24 generates the PID value of a TS packet from low-order eight bit data 12 of the IP address value and data 15 degenerated into five bits and generates the header of the TS packet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Converts video transmission systems compliant with the protocol (hereinafter referred to as IP) and video transmission systems compliant with the MPEG (Moving Picture Experts Group) multiplexing system specification (ITU-T H.222.0, ISO / IEC 13818-1) In particular, the present invention relates to a video distribution system that combines both techniques, and particularly when transmitting a video signal transmitted using the IP protocol using the H.222.0 method, an IP address value and a PID (Transport Stream) packet of a TS (Transport Stream) packet. The present invention relates to a method / device for converting a packet identifier (Packet Identifier) value and a video distribution system using the method / device.

[0002]

2. Description of the Related Art Conventionally, as a video distribution system on the Internet, "Experiment for delivering still and moving images on broadband Internet" (IEICE, IEICE Technical Report, OF
S97-4, pp.15-20 (1997-05)) is known. This system is a system that distributes a video image to a user via the Internet when there is a video distribution request from the user. In video distribution, a video signal is converted into IP packets and transmitted in IP packet format to a client on the user side via the Internet.
In such a system, video streams are distinguished by destination IP addresses.

On the other hand, in the MPEG multiplexing system specification, a video signal is transmitted in a TS packet format, and a video stream is distinguished by a PID value.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to receive an IP packet of a video signal transmitted in an IP format, and
The present invention solves a problem that occurs in the case of packetization and transmission, and the problem will be described below.
In a video distribution system using the Internet, video data is stored in IP packets from a server to a client in an IP format and transmitted. In this way, when transmission / reception is performed as it is as an IP packet, if the transmitting side and the receiving side recognize in what format data is transmitted,
Transmission and reception are possible regardless of the internal data format of the IP packet. On the other hand, for example, DAVIC (Digital Audio Visual Counci
l) A network for transmitting and receiving video signals in the TS packet format as specified in the specification and the like and an IP network for transmitting and receiving in the IP packet format are mutually connected, and the STB (Set) connected to the DAVIC network is connected. When receiving video data by accessing a server connected to the IP network from Top Box), it is necessary to convert the video data output from the server in IP packet format to TS packet format in order to transmit it to the DAVIC network. Inside a network that uses TS packets, a packet identifier called a PID is assigned to a packet, rather than an address, and broadcasted to the network.
A desired packet is received by a method such as selective reception based on PID. Since the TS packet is distinguished by the PID value in this way, if the IP of the IP packet is terminated and converted into a TS packet, if there is no conversion relationship between the IP address value and the PID value, the receiving STB identifies any PID. There is a problem that it becomes impossible to judge whether it is enough to receive the TS packet.

[0005] It is an object of the present invention to provide a conversion method and a conversion device between an IP address value and a PID value necessary for receiving video data converted into IP packets, converting the data into TS packets, and retransmitting the data. is there.

[0006]

In order to achieve the above-mentioned object, the present invention firstly provides the lower 8 bits (Bi) of an IP address value.
t: 7-0) and the lower 8 bits (Bit: 7-0) of the PID value are set to the same value, the upper 24 bits (Bit: 31-8) of the IP address value are reduced to 5 bits, and the compression is performed. The 5 bits correspond to the upper 5 bits (Bit: 12-8) of the PID value. Here, the degeneration means, for example, converting a 24-bit value to a 5-bit value. When the frequency for transmitting the TS packet is different, the same degeneration value (5 bits) can be set. is there. In the present invention, second, the lower 8 bits of the IP address value (Bit: 7-0) and the lower 8 bits of the PID value (Bit: 7-
0) to the same value, and the upper 24 bits (Bi
t: 31-8) is reduced to a 5-bit value of 1 to 30 excluding 0 and 31, and the reduced 5-bit value is the upper 5 bits of the PID value
(Bit: 12-8).

In the present invention, third, the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are set to the same value, and the upper 24 bits of the IP address value are set. Bit (Bit: 31-
8) is reduced to 3 bits, and the reduced 3 bits are PID
It is characterized in that bits 12 to 8 of the PID value correspond to 1 and bits 11 to 0 correspond to bits 10 to 8 of the value.

According to the present invention, fourth, the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are set to the same value, and the upper 24 bits of the IP address value are set. Bit (Bit: 31-
8) is reduced to 2 bits, and the reduced 2 bits are PID
The method is characterized in that bits 9 to 8 of the value are associated with bits 12 to 10 of the PID value and the type of data transmitted by the IP packet.

In the present invention, fifthly, the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are set to the same value, and the upper 24 bits of the IP address value are set. Bit (Bit: 31-
8) is reduced to 2 bits, and the reduced 2 bits are PID
Corresponds to bits 9 to 8 of the value, and degenerates to a 3-bit value of 1 to 6 excluding 0 and 7 for each data type transmitted by the IP packet, and degenerates the 3-bit value of the PID value It is characterized in that it corresponds to 3 bits of bits 12 to 10.

A sixth aspect of the present invention is an apparatus for receiving video data which has been IP-packetized, re-transmitting the video data after forming a TS packet,
Data corresponding to the conversion between the address value and the PID value is multiplexed with the retransmitted video data and transmitted to the video data receiving device.

[0011] The present invention provides, in a seventh aspect, an IP address value and a PID value conversion correspondence data created by any one of the means for solving the above-mentioned problems 1 to 5 by using an IP address value having a different IP address value. Each time a packet is received and turned into a TS packet,
The data is transmitted to a video data receiving device.

Eighth, the present invention provides an apparatus for converting an IP address value and a PID value, and an IP address value and a TID value.
The apparatus for retransmitting the data corresponding to the frequency number to which the S packet is multiplexed receives the IP packet having a different IP address value and transmits it to the video data receiving apparatus every time the packet is converted into a TS packet. .

A ninth aspect of the present invention is a device for receiving video data converted into an IP packet, converting the data corresponding to the IP address value and the PID value into TS packets, and retransmitting the data. The apparatus is characterized in that the apparatus receives in advance the video data that has been stored.

According to the tenth aspect of the present invention, the IP address value and the PID value conversion correspondence data created by any one of the means for solving the above problems 1 to 5 are converted into IP packetized video data. , And a device that receives the TS packetized and retransmitted video data, and a device that receives the TS packetized and retransmitted video data.

According to the eleventh aspect of the present invention, data corresponding to the conversion between the IP address value and the PID value, and the IP address value and the TS packet of the TS packet created by any one of the means for solving the above problems 1 to 5 are provided. The data corresponding to the multiplex destination frequency number is
An apparatus for receiving packetized video data and retransmitting after TS packetization and an apparatus for receiving the TS packetized and retransmitted video data are stored in advance.

According to a twelfth aspect of the present invention, there is provided an IP address value and a PID value conversion correspondence data created by any one of the means 1 to 5 for solving the above-mentioned problem, and an IP address value and a TS packet. The data corresponding to the multiplex destination frequency number is
A device for receiving packetized video data and retransmitting after TS packetization, and a device for receiving the TS packetized and retransmitted video data are held in advance and receive IP packetized video data. After a TS packet is re-transmitted, a plurality of devices are connected based on the correspondence data between the IP address value and the multiplexed frequency number of the TS packet. It is characterized by having means capable of transmitting after conversion into a packet.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a conversion system for an IP address value and a PID value according to the present invention, and a conversion device (hereinafter referred to as an IP / PID conversion device).

First Embodiment FIG. 11 is a diagram showing an example of a network configuration in which an IP / PID conversion device according to the present invention is used. First, an example of a network configuration in which the IP / PID conversion device of the present invention is used will be described with reference to FIG. 100 represents the Internet network, and 200 represents the DAVIC network. In the Internet network of 100, a client PC of 102 can make a video distribution request to a video server of 101 and receive and reproduce desired video data in an IP packet format. In FIG. 11, five STBs (S
et Top Box) Video server 10 on the Internet
1 to receive and reproduce desired video data. In 200 DAVIC networks, 10 interconnects the Internet and DAVIC networks.
Represents a unit, 1 represents a router, and 2 represents an IP / P according to the present invention.
An ID converter is shown, and 3 is a DAC (Dial-up Access Concentra).
tor) and 4 is QAM (Quadrature Amplitude Modulatio)
n), 210 represents an access network, 5 represents an STB, and 6 represents a TV. Hereinafter, the operation of accessing the video server 101 on the Internet from the STB connected to the DAVIC network and receiving and reproducing video data will be described. First, the user starts accessing a server on the Internet via a modem built in the STB 5.
DAC3 consolidates access from multiple users,
A line with a video server on the Internet is established via the router 1 in the rking unit 10. The user then
With reference to the video guide displayed on the TV 6, a desired video is selected. When a desired video is selected, the video server 101 on the Internet converts the requested video data into an IP packet and transmits it to the requesting STB. The video data in the IP packet format transmitted from the video server 101 is transmitted to the IP / PID conversion device 2 of the present invention via the router 1. The IP / PID conversion device 2 receives the received IP
Create a PID from the IP address of the packet, and
The P packet format video data is converted into the TS packet format video data to which the created PID is added, and the QAM
Transmit to. In QAM, the received TS packet format video data is QAM modulated and transmitted to the access network 210. In STB 5, the frequency at which the desired data is modulated is selected from the signal received from the access network 210, the TS transmitting the desired data is selected, and the desired video data is received. In addition, it decodes the received video data, transmits the video image to the TV 6, and reproduces and displays the video on the TV 6.

Subsequently, the first embodiment of the present invention will be described with reference to FIGS.
The IP / PID conversion device according to the embodiment will be described. FIG. 1 is a block diagram showing a configuration of an IP / PID conversion device according to a first embodiment of the present invention, FIG. 2 is a diagram showing a conversion correspondence between an IP address value and a PID value, and FIG. LUT (Look Up Tabl
This is the data content in e). The IP / PID converter according to the embodiment of the present invention shown in FIG. 1 sets the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value to the same value. , The upper 24 bits (Bi
In this embodiment, t: 31-8) is reduced to 5 bits, and the reduced 5 bits are converted into upper 5 bits (Bit: 12-8) of the PID value.

According to the first embodiment of the present invention shown in FIG.
The IP / PID conversion device includes a buffer 21 for receiving an IP packet.
, A CPU 22, an LUT 23 holding conversion data of an IP address value and a PID value, and a TS header section 2 for creating a TS header.
4 and an IP data part 25 for holding the data of the IP packet
And a switch 26 for transmitting TS packetized video data to a predetermined QAM. continue,
According to the first embodiment of the present invention configured as described above
The operation of the IP / PID conversion device will be described.

The IP / PID conversion device shown in FIG.
The buffer 21 receives the packetized video data 11. The CPU 22 reads the IP packet from the buffer 21, and stores the lower 8 bits (Bit: 7-0) of the IP address value.
Data 12 is transmitted to the TS header, and the upper 24 bits (Bi
t: 31-8) The data 13 is transmitted to the LUT 23. Further, it transmits the IP packet data 14 to the IP data section 25. LUT23
Then, the upper 24 bits of the IP address value (Bi
t: 31-8) Data 15 obtained by reducing data 13 to 5 bits
The QAM number data 16 is transmitted to the TS header section 24 and the QAM number data 16 of the frequency multiplexing destination is transmitted to the switch 26. TS header section 24
Is the lower 8 bits of the IP address value from the CPU 22 (Bit: 7-
0) A PID value of a TS packet is created from the data 12 and the data 15 obtained by reducing the upper 24 bits (Bit: 31-8) of the IP address value 13 from the LUT 23 to 5 bits, and a header of the TS packet is created. . A method of creating the PID value of the TS packet from the IP address value of the received IP packet will be described later with reference to FIGS. The switch 26
The TS header data 17 is read from the TS header section 24, the IP data 18 is read from the IP data section 25 which becomes the data of the TS packet, and the predetermined frequency multiplexing destination QAM (QAM1) is read in accordance with the frequency multiplexing destination QAM number data 16 from the LUT 23. ~ QAM
3), the TS header data 17 and the IP data 18 as TS packet data are transmitted. In this explanation, IP
Although the example in which the data converted from the IP packet to the TS packet in the / PID conversion device is QAM-modulated and transmitted to the subsequent stage has been described, a transmission method using a QPSK modulation method other than QAM may be used.

FIG. 2 and FIG. 3 show the IP of the received IP packet.
FIG. 4 is a diagram showing a correspondence relationship between an address value and a PID value of a TS packet to be transmitted. In FIG. 2, the lower 8 bits (Bit: 7-0) value 31 of the IP address value correspond to the lower 8 bits (Bi
t: 7-0) is converted to the value 32. Top 24 IP address values
The bit (Bit: 31-8) value 33 is reduced to a 5-bit value as the network number value, and the upper 5 bits (Bi
t: 12-8) Converted to the value 34. In addition, degeneration here is
This means converting a 24-bit value to a 5-bit value, which will be specifically described with reference to FIG.

FIG. 3 shows an IP stored in the LUT 23 of FIG.
It is a figure showing the correspondence of the upper 24 bits (Bit: 31-8) value 33 of an address value, the 5-bit value as a network number value, and the output destination QAM number value. In FIG. 3, for example, an IP address value of the 128.155.30.XXX series (XXX indicates any value from 0 to 255) is converted to a network number 1 (00001 in binary). Is shown. Similarly, the IP address value of the 128.155.40.XXX series is converted to the network number 2 (00010), and the 128.155.80.XX
The X-series IP address values are converted to the network number 30 (11110). LUT2 shows the correspondence table as above
By holding the value of 3, the upper 24 bits (Bit: 31-8) value 33 of the IP address value can be converted to a 5-bit value 34. However, as the PID value, a value (hexadecimal: 0x0000 to 0x000F, and a value stipulated for use in the MPEG multiplexing system specification (ITU-T H.222.0, ISO / IEC 13818-1))
0x1FFF), values from 0x0010 to 0x1FFE are available. In FIG. 3, when the 5-bit network number uses 0 (binary number: 00000) or 31 (binary number: 11111), the value of the lower 8 bits may overlap with the value whose use is defined. . For example, the network number is 0 (binary number: 00000) and the lower 8 bits are 1 (binary number: 00)
000001), the PID value is 1 (hexadecimal: 0x000)
Since this is 1), the value overlaps with the value stipulated for use in the MPEG multiplexing system specification, which causes a problem. Therefore, there is no duplication if a prohibition is set to avoid a case where the value overlaps with a value stipulated in the MPEG multiplexing system specification, or if 0 to 30 is used as a network number. Note that, in the example of FIG.
Although the description has been given of the conversion of the 4-bit (Bit: 31-8) value 33 to the 5-bit value, the series of the IP address value that provides the service is, for example, 128.155.XXX.XXX as shown in FIG. When the upper 16 bits (Bit: 31-16) of the values are all the same series, the upper 16 bits (Bit: 31-16)
31-16) may be omitted, and the conversion correspondence may be configured using only the remaining 8 bits (Bit: 15-8).

FIG. 3 also shows the correspondence between the upper 24 bits (Bit: 31-8) value 33 of the IP address value and the QAM number of the TS packet output destination. The correspondence is that the upper 24 bits (Bit: 31-8) value 33 of the IP address in FIG.
23, the transmission data (TS packet) output destination QAM
The relationship with the data 16 which is a number value is shown. For example, in FIG. 3, when users of the 128.150.30.XXX series and 128.150.40.XXX series access a server on the Internet, the request data is QAM (frequency) of QAM number 1
Is transmitted to the user through. Also
When an access is made from a user belonging to the 128.150.80.XXX series, the request data is QAM (frequency) of QAM number 3
Is transmitted to the user through. Thus, by specifying the number of the QAM to be transmitted for the IP address sequence of the user who has requested data, one Q
The number of users sharing the amount of data that can be transmitted by AM can be set for each IP address series. When data is transmitted by one QAM, the network number is 1 to
30 is used, the upper 24 bits (B
It can be used for 30 sequences out of the sequences specified in it: 31-8). When transmitting 31 or more streams, there will be duplicate values as network numbers, and the one-to-one relationship between IP address values and PID values will not hold, and IP address values can be converted to PID values. Even P
The IP address value cannot be uniquely determined from the ID value. However,
If the QAM numbers (frequency) for transmitting data are different, there is no problem even if the network numbers are duplicated.

As described above, the IP address value (32
Bits) to form a PID value (13 bits).
The conversion is performed in the UT 23 and the TS header section 24. Also LU
At T23, a QAM (frequency) number for transmitting data (TS packet) is designated from the series of IP address values. The data (IP packet) requested as described above is sent to IWU (In
terworking Unit) and converted to TS packets for QAM transmission, but the desired data is transmitted on the receiving side
If the PID number of the TS and the QAM number are not known, the TS cannot be selectively received. Therefore, a desired data receiving method will be described with reference to FIGS.

FIG. 4 shows the data transmission side IWU 10 and the reception side STB 5
Are diagrams showing a case where both of them hold conversion correspondence data between an IP address value and a PID value. 4 are basically the same as those in FIG. LU in FIG.
The T23 is the same as the LUT 23 in FIG. 1, and the data corresponding to the conversion between the IP address value and the PID value and the data transmission frequency (QAM
No.) is a LUT (Look Up Table). In FIG. 4, the transmitting-side IWU 10 converts the IP packet 11 received via the router 1 into a TS packet according to the LUT 23, and
Communicate to The QAM 4 modulates the received TS packet and transmits it to the access network 210. STB5 is its own IP
Refers to the LUT 23 based on the address, selects a signal of a frequency transmitting desired data from the received signals having a plurality of frequencies, and has a PID value designated by the LUT 23
A TS packet is selected and desired data is received. When playing back the received data on TV 6 connected to STB 5,
What is necessary is just to decode the received data and reproduce it on the 6 TV.
When further transmitting to a PC or the like connected to the STB 5, an LUT similar to the above-described LUT 23 is transmitted to the STB 5 and the PUT 7.
By holding it at C, the received TS packet can be further transmitted to 7 PCs.

FIG. 5 shows a modification of FIG. 4, in which the IWU 10 transmits the conversion relationship between the IP address value and the PID value and the correspondence relationship data of the data transmission frequency (QAM number) to the STB 5. . In FIG. 4, both the IWU 10 and the STB 5 hold the conversion relationship between the IP address value and the PID value and the correspondence relationship of the frequency (QAM number) at which data is transmitted.
IP address value and PID that only U10 holds and STB5 needs
Only the data indicating the conversion relationship with the value and the correspondence relationship between the TS packet transmission frequency (QAM number) are transmitted to the STB 5.
In FIG. 5, when the IWU 10 receives the IP packet 11 having the new IP address, changes it to a TS packet, and transmits it to the QAM, the IWU 10 transmits the TS packet and the correspondence data between the new IP address value and the PID value. (QAM number) Data 19
Is transmitted to the STB 5 via the QAM of 4. In this case,
It is necessary to set a special frequency (QAM number) and a PID value for transmitting the correspondence data between the IP address value and the PID value and the frequency (QAM number) for transmitting the TS packet data.
STB5 has a T (T) having the special frequency (QAM number) and PID value.
When an S packet is received, the conversion correspondence between the IP address value and the PID value and the frequency (QAM number) at which the TS packet is transmitted
Therefore, it is necessary to hold the data using a memory or the like inside the STB 5. Also, the STB 5 selects a signal of a frequency transmitting desired data based on the transmitted data transmission frequency (QAM number), and designates the received IP address value and the PID value in a conversion correspondence relationship. The TS packet having the specified PID value is selected and desired data is received. As described above, each time the IWU 10 receives an IP packet having a new IP address, converts it into a TS packet, and transmits the TS packet transmission frequency and the PID value to the STB 5 each time the STB 5 transmits the TS packet. Can be received.

As described above, according to the present embodiment,
By configuring the PID value of the TS packet from the IP address value of the IP packet, defining the series of IP addresses from the upper 24 bits of the IP address value, and setting the frequency for transmitting data for each series of the IP address , IP address value and
Conversion between the PID value and the PID value can be performed, and the number of users (IP dress number) for multiplex transmission at one frequency can be set for each IP address sequence unit.

Second Embodiment FIGS. 6 and 7 are diagrams showing the correspondence between the IP address value of an IP packet and the PID value of a TS packet according to the second embodiment of the present invention. FIG. 6 is a modified example of FIG. 2, in which the lower 8 bits (Bit: 7-0) value 31 of the IP address value is converted into the lower 8 bits (Bit: 7-0) value 32 of the PID value. As will be described later with reference to FIG. 7, the upper 24 bits (Bit: 31-8) value 33 of the IP address value is reduced to a 3-bit value as a network number value, and the 3 bits of bits 10 to 8 (Bit: 10-8) Converted to the value 35. Also, in FIG.
This shows that bit 12 of the D value is fixed at 1 and bit 11 is fixed at 0.

FIG. 7 shows a modification of FIG.
The upper 24 bits (Bit:
31-8) is a diagram illustrating a correspondence relationship between a value 33, a 3-bit value 35 as a network number value, and an output destination QAM number value. In FIG. 3, the upper 24 bits (B
it: 31-8) The value 33 is reduced to 5 bits.
The difference is that it is reduced to bits. In FIG. 7, for example, 128.15
5.30.XXX series IP address value is network number 0
(In binary, 000).
Similarly, the IP address value of the 128.155.40.XXX series is converted to the network number 1 (001), and the IP address value of the 128.155.80.XXX series is converted to the network number 7 (111). I have. LUT2 in Fig. 1
By storing the value as 3, the upper 24 bits (Bit: 31-8) value 33 of the IP address value can be converted to a 3-bit value 35. Note that, in the example of FIG. 7, the correspondence of converting the upper 24 bits (Bit: 31-8) value 33 of the IP address into 3 bits has been described, but the upper 16 bits (Bit: 31 -16) If the values are all the same sequence, omit the upper 16 bits (Bit: 31-16) and leave the remaining 8 bits
It is also possible to configure the conversion correspondence using only (Bit: 15-8). Also, as in FIG. 3, the correspondence between the upper 24 bits (Bit: 31-8) value 33 of the IP address value and the TS packet output destination QAM number is shown, and the method of use is the same as in FIG.

As described above, 13 bits of PID are converted to bit 1
2 is fixed to 1 and bit 11 is fixed to 0, and bits 10 to 8 are the upper 24 bits (Bit: 31-8) value 33 of the IP address value.
By setting the bits 7 to 0 to the same value as the lower 8 bits (Bit: 7-0) 31 of the IP address value and the upper 2 bits (Bit: 12-11) of the PID Are fixed to 1 and 0, the upper 24 bits (B
it: 31-8) When the value 33 and the lower 8 bits (Bit: 7-0) value 31 are converted into any value, the IP address value does not overlap with the value stipulated in the MPEG multiplexing system specification. And the PID value can be mutually converted.

Third Embodiment FIGS. 8, 9 and 10 are diagrams showing a correspondence relationship between an IP address value of an IP packet and a PID value of a TS packet according to a third embodiment of the present invention. . FIG. 8 is a modification example of FIG. 2, in which the lower 8 bits (Bit: 7-0) value 31 of the IP address value are:
It is converted to the lower 8 bits (Bit: 7-0) value 32 of the PID value. I
As will be described later with reference to FIG. 9, the upper 24 bits (Bit: 31-8) value 33 of the P address value is reduced to a 2-bit value as a network number value, and two bits (Bit: 9
-8) Converted to value 37. Also, bits 12 to 10 of the PID value
As described later with reference to FIG. 10, three bits corresponding to the type of data are inserted into 38.

FIG. 9 shows a modification of FIG.
The upper 24 bits (Bit:
31-8) is a diagram illustrating a correspondence relationship between a value 33, a 2-bit value as a network number value 37, and an output destination QAM number value. In FIG. 3, the upper 24 bits (B
it: 31-8) The value 33 is reduced to 5 bits.
The difference is that it is reduced to bits. In FIG. 9, for example, 128.15
5.30.XXX series IP address value is network number 0
(In binary, 00). Hereinafter, the same conversion is performed for the IP address values of the 128.155.40.XXX series and the 128.155.80.XXX series. By holding the above correspondence table in the LUT 23 of FIG. 1, the upper 24 bits (Bit: 31-8) value 33 of the IP address value can be converted into a 2-bit value 37. Note that, in the example of FIG. 9, a description has been given of the case where the upper 24 bits (Bit: 31-8) value 33 of the IP address is converted into 2 bits, but the upper 16 bits (Bit: 31 -16) If the values are all the same sequence, omit the upper 16 bits (Bit: 31-16) and configure the conversion correspondence using only the remaining 8 bits (Bit: 15-8) Is also possible. Also, as in FIG. 3, the correspondence between the upper 24 bits (Bit: 31-8) value 33 of the IP address value and the TS packet output destination QAM number is shown, and the method of use is the same as in FIG.

FIG. 10 is a diagram showing the correspondence between the type of data and the 3-bit value of the type number value 38 in FIG. In FIG. 10, for example, when the type of data transmitted by the received IP packet is video, 2 (binary number: 010)
Indicates that the data corresponds to 1 (binary number: 001) when the data is audio data, for example. The relationship between the data type and the type number value (3 bits) in FIG. 10 is used, for example, when the PID value is set to a different value corresponding to the data type transmitted by the IP packet, as described above. Note that the type number values are 0 (binary number: 000) and 7 (binary number: 111).
Is used, as in the case described with reference to FIG. 3, depending on the value of the network number value 2 bits and the lower 8 bits, M
Since there is a case where the value overlaps with the value specified in the PEG multiplexing system specification, it is necessary to provide a prohibition for avoiding the duplicated value, or to take measures such as using 1 to 6 as the type number value.

As described above, 13 bits of PID are replaced with bit 1
2 to 10 are the 3 bits of the type number value, and bits 9 to 8 are the upper 24 bits (Bit: 31-8) value 33 of the IP address value.
And the bits 7 to 0 are set to the same value as the lower 8 bits (Bit: 7-0) 31 of the IP address value to correspond to the data type transmitted by the IP packet. Thus, it is possible to obtain an effect that the PID value can be set to a different value and the IP address value and the PID value can be converted.

[0036]

As described above, according to the present embodiment, the PID value of the TS packet is formed from the IP address value of the IP packet, and the series of IP addresses is defined from the upper 24 bits of the IP address value. By setting the frequency for transmitting data for each series of IP addresses, one-to-one conversion between an IP address value and a PID value is possible, and the frequency for transmitting data for each series of IP addresses ( QAM number) can be set, and the number of users (the number of IP dresses) sharing the amount of data that can be transmitted on one frequency can be set freely.
The effect that it can be set for each IP address sequence unit can be obtained. By setting 3 bits of the 13 bits of the PID as the data type, the PID value of the converted TS packet can be set according to the data type transmitted by the IP packet.

[Brief description of the drawings]

FIG. 1 shows an IP address value according to a first embodiment of the present invention;
It is a block diagram which shows the structure of a conversion apparatus with a PID value.

FIG. 2 shows an IP address value according to the first embodiment of the present invention;
FIG. 4 is a diagram illustrating a correspondence relationship with a PID value.

FIG. 3 is a diagram showing a correspondence relationship between upper 24 bits of an IP address value and 5 bits as a network number according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a network configuration in which both a data transmission side IWU and a reception side STB according to an embodiment of the present invention hold data corresponding to conversion between an IP address value and a PID value and realize transmission and reception of data; is there.

FIG. 5 is a diagram showing a network configuration for transmitting and receiving data by transmitting a conversion correspondence between an IP address value and a PID value from a data transmitting IWU to a receiving STB according to an embodiment of the present invention; is there.

FIG. 6 shows an IP address value according to a second embodiment of the present invention;
FIG. 4 is a diagram illustrating a correspondence relationship with a PID value.

FIG. 7 is a diagram illustrating a correspondence relationship between upper 24 bits of an IP address value and 3 bits as a network number according to the second embodiment of the present invention.

FIG. 8 shows an IP address value according to a third embodiment of the present invention;
FIG. 4 is a diagram illustrating a correspondence relationship with a PID value.

FIG. 9 is a diagram showing a correspondence relationship between upper 24 bits of an IP address value and 2 bits as a network number according to the third embodiment of the present invention.

FIG. 10 is a diagram illustrating a correspondence relationship between a data type and three bits as a type number according to the third embodiment of the present invention.

FIG. 11 is a diagram showing an example of a network configuration in which the IP / PID conversion device of the present invention is used.

[Explanation of symbols]

1: Router, 2: Conversion device between IP address value and PID value,
3: Dial-up Access Concentrator, 4: Quadrature Am
plitude Modulation, 5: Set Top Box, 6: TV, 7: P
C, 10: Interworking Unit, 21: buffer, 22:
CPU, 23: LookUp Table, 24: Transport Stream header, 25: IP data, 26: switch.

Claims (14)

[Claims] 1. A method for converting between an IP address value and a PID value, wherein the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are the same. And degenerate the upper 24 bits (Bit: 31-8) of the IP address value to 5 bits,
The degenerated 5 bits are assigned to the upper 5 bits of the PID value (Bit: 12-
Conversion method between IP address value and PID value corresponding to 8). 2. A method for converting between an IP address value and a PID value, wherein the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are the same. And the upper 24 bits (Bit: 31-8) of the IP address value excluding 0 and 31 are 1-3
0 is reduced to a 5-bit value, and the reduced 5-bit value is
A conversion method between an IP address value and a PID value corresponding to the upper 5 bits (Bit: 12-8) of the PID value. 3. A method for converting between an IP address value and a PID value, wherein the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are the same. Value, degenerate the upper 24 bits (Bit: 31-8) of the IP address value to 3 bits,
A conversion method between an IP address value and a PID value in which the degenerated 3 bits correspond to bits 10 to 8 of the PID value, bit 12 of the PID value corresponds to 1 and bit 11 corresponds to 0. 4. A method for converting between an IP address value and a PID value, wherein the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are the same. And degenerate the upper 24 bits (Bit: 31-8) of the IP address value to 2 bits,
A conversion method between an IP address value and a PID value in which the degenerated 2 bits correspond to bits 9 to 8 of the PID value, and bits 12 to 10 of the PID value correspond to the type of data transmitted by the IP packet. . 5. A method for converting between an IP address value and a PID value, wherein the lower 8 bits (Bit: 7-0) of the IP address value and the lower 8 bits (Bit: 7-0) of the PID value are the same. And degenerate the upper 24 bits (Bit: 31-8) of the IP address value to 2 bits,
The degenerated 2 bits are made to correspond to bits 9 to 8 of the PID value, and are converted into 3-bit values of 1 to 6 excluding 0 and 7 for each data type transmitted by the IP packet. A conversion method between an IP address value and a PID value in which a bit value corresponds to three bits of bits 12 to 10 of the PID value. 6. Receiving IP packetized video data
After TS packetization, the device that retransmits the IP address value and PI
Means for receiving desired video data by multiplexing data corresponding to conversion with the D value with retransmitted video data and transmitting the multiplexed data to a video data receiving device.
Conversion device between IP address value and PID value. 7. An apparatus for converting an IP address value to a PID value according to claim 6, wherein the conversion correspondence data between the IP address value and the PID value created by the method according to any one of claims 1 to 5 is different. Each time an IP packet having an IP address value is received and converted into a TS packet, the IP packet is transmitted to a video data receiving device, so that the receiving device has means capable of receiving desired video data. Address value and PID
Conversion device with value. 8. A data corresponding to a conversion between an IP address value and a PID value created by the method according to claim 1;
The device that retransmits the data corresponding to the address value and the multiplexed frequency number of the TS packet has a different IP address value
Each time an IP packet is received and converted into a TS packet, it is transmitted to the video data receiving device, so that the receiving device has a means capable of selecting a frequency on which the desired video data is multiplexed and receiving the desired video data. IP characterized by
Conversion device between address value and PID value. 9. An apparatus which receives IP packetized video data, converts it into a TS packet, and retransmits the data corresponding to the conversion between the IP address value and the PID value, and transmits the TS packetized and retransmitted video data. An IP address value and a PID, characterized in that the receiving device has means capable of receiving desired video data by being held in advance by the receiving device.
Conversion device with value. 10. An apparatus for converting an IP address value to a PID value according to claim 9, wherein the data corresponding to the conversion between the IP address value and the PID value created by the method according to any one of claims 1 to 5 is converted to an IP address. The apparatus for receiving packetized video data and retransmitting after TS packetization, and the apparatus for receiving the TS packetized and retransmitted video data are held in advance, so that the receiving apparatus can obtain desired video data. IP address value and PID characterized by having means capable of receiving
Conversion device with value. 11. A conversion correspondence data between an IP address value and a PID value created by the method according to claim 1, and I
The data corresponding to the P address value and the frequency number to which the TS packet is multiplexed is received.
The device that retransmits after packetization and the device that receives the TS packetized and retransmitted video data previously hold, so that the receiving device selects a frequency at which the desired video data is multiplexed and A conversion device between an IP address value and a PID value, characterized by comprising means capable of receiving video data. 12. A data corresponding to a conversion between an IP address value and a PID value created by the method according to claim 1;
The data corresponding to the P address value and the frequency number to which the TS packet is multiplexed is received.
A means for pre-holding a device for retransmitting after packetization and a device for receiving the retransmitted video data which has been TS packetized, and a device for receiving IP packetized video data.
After a TS packet is re-transmitted, a plurality of devices are connected based on the correspondence data between the IP address value and the multiplexed frequency number of the TS packet. Means for transmitting the video data after conversion into packets, and a device for receiving the retransmitted video data in the form of TS packets selects the frequency on which the desired video data is multiplexed, and receives and reproduces the desired video data by selecting the TS packets. An apparatus for converting between an IP address value and a PID value, comprising: 13. An inter-working unit connected to both a first network for transmitting IP packetized video data and a second network for transmitting TS packetized video data, It has a table holding the correspondence between the IP address value of the IP packet and the PID value of the TS packet, and conversion means for converting the IP packet into a TS packet, and the conversion means refers to the table, PI corresponding to the IP address value in the IP packet received from the first network
The D value is specified, and the I value received using the specified PID value is determined.
An interworking unit for converting a P packet into a TS packet and transmitting the TS packet to the second network. 14. A video distribution system in which a first network through which IP packetized data is transmitted and a second network through which TS packetized data are transmitted, wherein the first network is connected to the first network. A video server connected thereto, an interworking unit connected to both the first network and the second network, the interworking unit having a function of routing the IP packet and a function of converting an IP packet to a TS packet; A plurality of set-top boxes connected to the first network via the interworking unit and connected to the second network, wherein the set-top boxes are connected to the video server. The video data distribution request is sent to the video server
By transmitting a TS packet to which the P address and its own IP address have been assigned to the interworking unit, the interworking unit routes the TS packet from the set-top box requesting the distribution, and And a specific PID value is assigned to the IP address of the set-top box requesting distribution, and the IP address of the set-top box requesting distribution and the assigned P
The ID value is stored in a conversion table of the IP address and the PID value, and the assigned PID value is notified to the set-top box requesting the distribution, and the video server transmits the video data requested to be distributed to the distribution request. The interworking unit makes a distribution request in the TS packet from the video server as a TS packet to which the IP address of the set top box and its own IP address are added, and sends the packet to the first network. The conversion table is searched based on the IP address of the set-top box, and the PID value is specified.
The S-packet is converted into a TS packet to which the specified PID value is added, and is transmitted to the second network. The set-top box requesting the distribution, based on the PID value notified from the interworking unit, A video distribution system for extracting a TS packet relating to desired video data from the second network.