JP2001274776A - Information data transmission system and its transmitter and receiver - Google Patents

Information data transmission system and its transmitter and receiver

Info

Publication number
JP2001274776A
JP2001274776A JP2000083535A JP2000083535A JP2001274776A JP 2001274776 A JP2001274776 A JP 2001274776A JP 2000083535 A JP2000083535 A JP 2000083535A JP 2000083535 A JP2000083535 A JP 2000083535A JP 2001274776 A JP2001274776 A JP 2001274776A
Authority
JP
Japan
Prior art keywords
information data
delay time
parameter
transmission system
sub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000083535A
Other languages
Japanese (ja)
Inventor
Masahiro Abe
雅宏 阿部
Original Assignee
Toshiba Corp
株式会社東芝
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, 株式会社東芝 filed Critical Toshiba Corp
Priority to JP2000083535A priority Critical patent/JP2001274776A/en
Publication of JP2001274776A publication Critical patent/JP2001274776A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Summary] [PROBLEMS] To enable an interleave delay time to be dynamically changed. SOLUTION: On a transmission side, an interleave control circuit 17 is provided.
According to the interleave delay time change request, the parameter corresponding to the corresponding delay time is selected, and the additional circuit
15 and put on the sub-information data, and at the same time, the interleave circuit (11
1 to 11n). Further, the output of the pattern data generation circuit 18 is fetched and put on the sub information data or the main information data at a predetermined cycle. On the receiving side, the deinterleave control circuit 26 causes the selection switching circuit 24 to select the output of the deinterleave circuits (231 to 23n) having the corresponding delay time based on the parameters obtained from the sub information data. At this time, the deinterleave circuits 231 to 23n
Then, the pattern data is received, the main information data is searched, and deinterleaving is started from the matching position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a sub-information channel for transmitting sub-information data separately from a main information channel for transmitting main information data, wherein the transmitting side interleaves the main information data, and The present invention relates to an information data transmission system for deinterleaving the main information data received at (1).

[0002]

2. Description of the Related Art In information data transmission systems such as digital satellite communication and digital satellite broadcasting, interleaving is effective as a measure against burst errors and instantaneous interruptions caused by fading of transmission paths. As the types of interleaving, there are a periodic interleaving method (block interleaving method or convolutional interleaving method) and a random number interleaving method. In any of the interleaving methods, the interleave delay time can be set with a degree of freedom.

Here, when the above-mentioned delay time is set to be large, excellent performance is exhibited against a long-time burst error and a long-time instantaneous interruption. However, on the receiving side, the real time communication is impaired due to the large delay time. Conversely, if the delay time is set to a small value, the effect on real-time communication is reduced, but sufficient performance cannot be exerted against a long-time burst error and a long-time instantaneous interruption.

For this reason, the optimum value of the interleave delay time differs depending on the state of the transmission path and the like. For this reason, it may be desirable to set the interleave delay time variably. Conventionally, there is a method of changing the setting of the interleave delay time before the start of communication or broadcasting, and variably setting the interleave delay time.In this method, a dynamic transmission path during communication or broadcasting is used. The interleave delay time cannot correspond to the change. When communication and broadcasting are performed continuously for a long period of time, the setting of the interleave delay time cannot be changed during that period.

[0005]

As described above, in the conventional information data transmission system, the interleaving delay time cannot cope with a change in a dynamic transmission line or the like during communication or broadcasting. Is performed continuously over a long period of time, there is a problem that the setting of the interleave delay time cannot be changed during that period.

The present invention has been made in view of the above circumstances, and dynamically changes the setting of the interleave delay time in response to changes in the transmission path and the like, and reduces the amount of data loss after switching the interleave delay time. An object of the present invention is to provide an information data transmission system that can be minimized, and a transmission device and a reception device thereof.

[0007]

In order to achieve the above object, the present invention has a sub information channel for transmitting sub information data separately from a main information channel for transmitting main information data. In the information data transmission system in which the main information data is interleaved and the main information data received on the receiving side is deinterleaved, the interleaving delay time is arbitrarily selected and set on the transmitting side and set through the sub information channel. Transmit a parameter corresponding to the interleave delay time, switch control the deinterleave delay time based on parameters obtained from the sub information channel on the receiving side,
Synchronized with the interleave delay time on the transmission side.

In particular, all interleave delay times that can be selected and set on the transmission side are known, and deinterleaving is performed in parallel on the reception side with deinterleave delay times corresponding to all interleave delay times to obtain from the sub information channel. The corresponding output is selected from the deinterleaved outputs that have been processed in parallel based on the parameters obtained.

When the interleaving delay time is switched on the transmitting side, the switching timing information is transmitted along with the parameter via the sub information channel, and the receiving side receives the switching timing information along with the parameter from the sub information channel. The switching control timing of the deinterleave delay time based on the parameter is determined based on the switching timing information.

[0010] Alternatively, when the interleaving delay time is switched on the transmitting side, specific pattern data is inserted into the interleaving delay time switching point of the main information data, and the specific pattern data is transmitted together with the parameter through the sub information channel. On the receiving side, the specific pattern signal is received together with the parameter from the sub information channel, specific pattern data is detected from the received main information data, and the deinterleave delay time switching control timing based on the parameter is detected based on the detection result. Was decided.

In particular, the specific pattern data is transmitted at a constant period for a constant period.

That is, in the information data transmission system according to the present invention, in order to dynamically variably set the interleave delay time, information on the parameter corresponding to the interleave delay time and the interleave synchronization timing is transmitted and received on the sub information channel. The side detects the parameter corresponding to the interleave delay time and the information of the interleave synchronization timing.

In order to reduce the time lag due to switching of the interleave delay time, a plurality of deinterleaves corresponding to each interleave delay time are performed in parallel on the receiving side, and a specific pattern is set immediately after the switching of the interleave delay time on the transmission side. Data is added, for example, to transmit a specific pattern data repeatedly for a certain period of time at a sub-information channel cycle or a cycle of an integer multiple thereof,
The specific pattern data is detected on the receiving side, and deinterleaving can be performed from the time when the specific pattern data is detected.

The present invention is characterized in that the interleaving is performed with the minimum time lag by dynamically changing the interleaving delay time by the above processing.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a configuration of an information data transmission system according to the present invention, particularly focusing on interleave processing, wherein A is a transmitting device and B is a receiving device. In this system, for example, a main information channel for transmitting program information data composed of video data, audio data, still image data, and the like, and a sub information channel for transmitting control data and management data necessary for reproducing program information data. It is assumed that

In the transmitting device A, the main information data is
To the n-th interleave circuits 111 to 11n. These interleaving circuits 111 to 11
n is for interleaving input main information data with different delay times X1 to Xn.

The above interleave circuits 111 to 11n
Is supplied to the selection switching circuit 12. The selection switching circuit 12 selects and outputs one of the interleave outputs in accordance with an instruction signal from an interleave control circuit 17 described later. Here, at the time of switching, specific pattern data generated by the pattern data generation circuit 18 is inserted into the delimiting portion. This selection switching circuit 12
Is sent to the multiplexing circuit 14 via the modulation circuit 13.

On the other hand, the sub-information data is sent to the multiplexing circuit 14 via the modulation circuit 16 after the control information and the like for the main information data are added by the adding circuit 15, and is multiplexed with the main information data to be transmitted and output. Become.

Here, when a change in the interleave delay time is required due to a change in transmission path characteristics or the like and a setting signal is provided, the setting signal is supplied to the interleave control circuit 17. This interleave control circuit 17
Selects the parameter corresponding to the setting signal from the parameters corresponding to the interleave delay time that can be set in the present system, sends it to the additional circuit 15 and puts it on the sub information data, and at the same time sends the selection instruction signal to the selection switching circuit 12 And causes the output of the corresponding interleave circuit to be selected. Also, specific pattern data is fetched from the pattern data generation circuit 18 and placed on the sub-information data at a sub-information channel cycle or a cycle of an integral multiple thereof.

In the receiving device B, the signal received from the transmitting device A is supplied to a separating circuit 21, where it is separated into main information data and sub information data. The main information data is supplied to the first to n-th deinterleaving circuits 231 to 23n via the demodulating circuit 22. These deinterleave circuits 231 to 23n correspond to the first to n-th interleave circuits 111 to 11n on the transmission side, respectively, and deinterleave input main information data with the same delay times X1 to Xn as those on the transmission side. . The output of each of the deinterleaving circuits 231 to 23n is supplied to a selection switching circuit 24, and the deinterleaving output selected by the selection setting of this circuit 24 is sent to the data processing system as a reception output.

On the other hand, the sub information data separated by the separation circuit 21 is sent to the data processing system via the demodulation circuit 25, but is also supplied to the deinterleave control circuit 26 at the same time. The deinterleave control circuit 26 extracts a parameter representing the interleave delay time added on the transmission side from the sub information data, determines a deinterleave circuit to be selected from the parameter, and outputs an instruction signal to the selection switching circuit 24. Then, the corresponding deinterleave circuit is selected. Also, specific pattern data is extracted from the sub information data, and the specific pattern data is provided to each of the deinterleave circuits 231 to 23n, and used for timing control of the deinterleave switching point.

The switching operation of the interleave delay time in the above configuration will be described below with reference to FIG.

First, in the transmitting apparatus A, the main information data is interleaved with n different delay times X1 to Xn by the first to n-th interleave circuits 111 to 11n, and the main information data is designated by the delay time control circuit 17 A predetermined interleave output is selected by the selection switching circuit 12,
Transmit output. Here, when the interleave delay time setting signal is given and it is necessary to switch the delay time, the interleave control circuit 17 puts the parameter of the corresponding interleave delay time on the sub information data according to the setting signal and selects the selection instruction signal. Output to the switching circuit 12. Also, the specific pattern data generated by the pattern data generation circuit 18 is fetched and put on the sub information data.

When the switching control circuit 12 receives an instruction from the interleave control circuit 17, the switching control circuit 12 selects the output of the corresponding interleave circuit and outputs the selected output. The specific pattern data generated by the pattern data generation circuit 18 at the time of the switching is output to the channel. It is inserted repeatedly at a cycle or a cycle that is an integral multiple of the cycle. For example, before switching, the first interleave circuit 1
When selecting the output of No. 11 and switching to the output of the second interleave circuit 112 according to the instruction signal, specific pattern data is inserted as shown in FIG.

On the other hand, in the receiving device B, when receiving the transmission signal from the transmitting device A, the received signal is input to a separating circuit 21 to separate it into main information data and sub-information data. Demodulates with. The demodulated output of the main information data is supplied to the first to n-th deinterleave circuits 231 to 231.
23n, and the demodulated output of the sub information data is supplied to the deinterleave control circuit 26.

The deinterleave control circuit 26 obtains a parameter indicating the interleave delay time from the sub information data, determines which deinterleave circuit should be used, sends an instruction signal to the selection switching circuit 24, and Select the output of the interleave circuit. Also, specific pattern data is obtained from the sub-information data and provided to each of the deinterleaving circuits 231 to 23n. Each of these deinterleaving circuits 231 to 23n searches for the specific pattern data from the main information data, and starts deinterleaving at the time of matching.

With the above processing, it is possible to set switching to deinterleave with the same delay time on the receiving side as on the transmitting side.
Further, by using the specific pattern data at the time of switching, deinterleaving can be switched with a minimum time lag.

Therefore, the information data transmission system having the above configuration can variably set the interleave delay time during communication, and can perform deinterleaving with a minimum time lag on the receiving side.

The present invention is not limited to the above embodiment. For example, although the specific pattern data is used for setting the switching timing in the above embodiment, the switching timing signal itself may be transmitted on the sub information channel, and the start position of the deinterleaving may be determined based on this signal.

[0031]

As described above, according to the present invention, the setting of the interleave delay time is dynamically changed in response to a change in the transmission path and the like, and the amount of data loss after switching the interleave delay time is minimized. And an information data transmission system capable of transmitting the information data, and a transmission device and a reception device thereof.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an information data transmission system according to an embodiment of the present invention, particularly focusing on interleave processing.

FIG. 2 is a time chart for explaining an interleave switching process according to the embodiment;

[Explanation of symbols]

 A: transmitting device B: receiving device 111 to 11n first to n-th interleaving circuit 12: selection switching circuit 13: modulation circuit 14: multiplexing circuit 15: additional circuit 16: modulation circuit 17: interleave control circuit 18: pattern Data generation circuit 21 Separation circuit 22 Demodulation circuit 231 to 23n First to n-th deinterleave circuits 24 Selection switching circuit 25 Demodulation circuit 26 Deinterleave control circuit

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission Date] September 18, 2000 (2009.1)
8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H04N 7/081

Claims (14)

[Claims]
1. A main information channel for transmitting sub information data separately from a main information channel for transmitting main information data, wherein the transmitting side interleaves the main information data, and the main information data received by the receiving side. In the information data transmission system for deinterleaving, the transmission side arbitrarily selects and sets the interleaving delay time, transmits a parameter corresponding to the interleaving delay time set through the sub information channel, and An information data transmission system, wherein switching control of the deinterleave delay time is performed based on a parameter obtained from a sub information channel to synchronize the deinterleave delay time with a transmission side interleave delay time.
2. The method according to claim 1, wherein all interleave delay times that can be selected and set on the transmitting side are known, and deinterleaving is performed on the receiving side in parallel with deinterleave delay times corresponding to all interleave delay times. 2. The information data transmission system according to claim 1, wherein a corresponding output is selected from the deinterleaved outputs processed in parallel based on the parameters obtained.
3. When the interleaving delay time is switched on the transmitting side, the switching timing information is transmitted through the sub information channel together with the parameter, and the receiving side receives the switching timing information together with the parameter from the sub information channel. 2. The information data transmission system according to claim 1, wherein a switching control timing of said deinterleave delay time based on said parameter is determined based on said switching timing information.
4. When the interleaving delay time is switched on the transmitting side, specific pattern data is inserted into the interleaving delay time switching point of the main information data, and the specific pattern data is transmitted together with the parameter through the sub information channel. On the receiving side, the specific pattern data is received together with the parameter from the sub information channel, the specific pattern data is detected from the received main information data, and the switching control timing of the deinterleave delay time based on the parameter is determined from the detection result. The information data transmission system according to claim 1, wherein the information data transmission system is determined.
5. The method according to claim 1, wherein the specific pattern data includes:
The information data transmission system according to claim 4, wherein the transmission is performed at a fixed period.
6. A main information data which has a sub information channel for transmitting sub information data separately from a main information channel for transmitting main information data, performs interleaving on the main information data on a transmission side, and receives main information data on a reception side. Used in an information data transmission system for deinterleaving, wherein the interleave delay time is arbitrarily selected and set, and a parameter corresponding to the set interleave delay time is transmitted through the sub information channel. Transmission device of the information data transmission system.
7. A plurality of interleaving circuits for respectively interleaving main information data with different delay times, and a selecting circuit for selecting an output of any of the plurality of interleaving circuits and outputting the selected output to the main information channel. 7. The transmitting apparatus of the information data transmission system according to claim 6, wherein a parameter corresponding to a delay time of an output of the selected interleave circuit is transmitted to the sub information channel.
8. The transmitting apparatus for an information data transmission system according to claim 6, wherein when switching the interleave delay time, the switching timing information is transmitted to the sub information channel together with the parameter. .
9. When the interleave delay time is switched, specific pattern data is inserted into the interleave delay time switching point of the main information data, and the specific pattern data is transmitted to the sub information channel together with the parameter. 7. The transmission device for an information data transmission system according to claim 6, wherein:
10. The transmitting apparatus of the information data transmission system according to claim 6, wherein the specific pattern data is transmitted at a fixed period for a fixed period.
11. A main information channel for transmitting sub information data separately from a main information channel for transmitting main information data, wherein the transmitting side interleaves the main information data and the receiving side receives main information data. Used in the information data transmission system to de-interleave the, at the transmitting side, and arbitrarily select and set the interleaving delay time, when transmitting a parameter corresponding to the interleaving delay time set through the sub-information channel, A receiving apparatus for an information data transmission system, comprising: switching control of a delay time of the deinterleaving based on a parameter obtained from the sub information channel, so as to synchronize the deinterleaving delay time with an interleaving delay time of a transmission side.
12. A plurality of deinterleaving circuits for deinterleaving received main information data, each of which corresponds to a known interleaving delay time when a plurality of interleaving delay times that can be selected on the transmitting side are known; 2. A selection circuit for extracting the parameter from the sub information channel and selectively outputting one of the plurality of deinterleaving circuits based on the extracted parameter.
2. The receiving device of the information data transmission system according to 1.
13. When the switching timing information is transmitted to the sub information channel together with the parameter when the interleaving delay time is switched on the transmitting side, the switching timing information is received together with the parameter from the sub information channel, and the switching timing information is transmitted to the sub information channel. 12. The receiving device of the information data transmission system according to claim 11, wherein a switching control timing of the deinterleaving delay time based on the switching timing is determined based on the switching timing information.
14. When the interleaving delay time is switched on the transmitting side, specific pattern data is inserted into an interleaving delay time switching point of main information data, and the specific pattern data is transmitted together with the parameter through the sub information channel. At this time, the specific pattern data is received together with the parameter from the sub information channel, the specific pattern data is detected from the received main information data, and a switching control timing of the deinterleave delay time is determined based on the detection result based on the detection result. The receiving device of the information data transmission system according to claim 11, wherein
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US8806050B2 (en) 2010-08-10 2014-08-12 Qualcomm Incorporated Manifest file updates for network streaming of coded multimedia data
US8887020B2 (en) 2003-10-06 2014-11-11 Digital Fountain, Inc. Error-correcting multi-stage code generator and decoder for communication systems having single transmitters or multiple transmitters
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US8958375B2 (en) 2011-02-11 2015-02-17 Qualcomm Incorporated Framing for an improved radio link protocol including FEC
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US8958375B2 (en) 2011-02-11 2015-02-17 Qualcomm Incorporated Framing for an improved radio link protocol including FEC
US9270299B2 (en) 2011-02-11 2016-02-23 Qualcomm Incorporated Encoding and decoding using elastic codes with flexible source block mapping
US9253233B2 (en) 2011-08-31 2016-02-02 Qualcomm Incorporated Switch signaling methods providing improved switching between representations for adaptive HTTP streaming
US9843844B2 (en) 2011-10-05 2017-12-12 Qualcomm Incorporated Network streaming of media data
US9294226B2 (en) 2012-03-26 2016-03-22 Qualcomm Incorporated Universal object delivery and template-based file delivery

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