CN1595816A - 宽波段广播对应接收机 - Google Patents

宽波段广播对应接收机 Download PDF

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CN1595816A
CN1595816A CNA200410075257XA CN200410075257A CN1595816A CN 1595816 A CN1595816 A CN 1595816A CN A200410075257X A CNA200410075257X A CN A200410075257XA CN 200410075257 A CN200410075257 A CN 200410075257A CN 1595816 A CN1595816 A CN 1595816A
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CN100394712C (zh
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正贺信宽
三原良和
藤田昌士
大槻良辅
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Sanyo Electric Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
    • H03M13/2703—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques the interleaver involving at least two directions
    • H03M13/2707—Simple row-column interleaver, i.e. pure block interleaving
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
    • H03M13/2789—Interleaver providing variable interleaving, e.g. variable block sizes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2385—Channel allocation; Bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637—Control signals issued by the client directed to the server or network components
    • H04N21/6373—Control signals issued by the client directed to the server or network components for rate control, e.g. request to the server to modify its transmission rate

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Error Detection And Correction (AREA)
  • Information Transfer Between Computers (AREA)

Abstract

本发明提供一种宽波段广播收发系统中的宽波段广播对应接收机，该系统具备：内容服务器；和通过互联网连接到内容服务器上的宽波段广播对应接收机，所述内容服务器具备：发送将所述宽波段广播对应接收机所要求的尺寸的内容数据进行过交织的数据的功能，所述宽波段广播对应接收机具备通过将所接收的内容数据进行反交织处理而恢复原来内容的功能，其中具备：改变向所述内容服务器要求的内容尺寸的内容尺寸控制机构。

Description

宽波段广播对应接收机
技术领域
本发明涉及宽波段广播对应接收机。
背景技术
在宽波段广播中，在传送数据时从前头开始顺序地传送数据的方式中，当发生数据包丢失时，数据将会连续地丢失。因此，将数据归纳为某种程度的尺寸，附加上奇偶位并进行交织地传送。
如果具体地说，则如图1所示，将数据假设地进行二维处理。在图1中，0～m分别表示一个字节大小的数据。图1的右侧的图是将一维的数据以每47字节折返，将一维的数据表示为二维的情况。
另外，如图2所示，对于各行的47个字节的数据附加4个字节的奇偶位，使每行成为51个字节。如果消失到构成各行的51个字节中的4个字节，则可以从剩下的数据来复原消失的数据。
所谓交织，就是将以图1所示的顺序排列的数据如图3所示，以不同的顺序读入的方法。而且，将块整体的数据尺寸(此例中为47×n)称之为交织块长度。
在宽波段广播中，如图4所示，内容服务器1，通过互联网2将交织过的数据发送到客户机(数字TV接收机)3，在客户机3侧进行反交织(交织的逆变换)，以恢复原来的数据。
以往，内容再生时的待机时间很长。这是将为了数据包丢失等的误差对策而接收的数据尺寸增大的缘故。内容服务器1为了发送交织过的数据，而从所定尺寸的数据生成数据包。从内容服务器1顺次发送已生成的多个数据包。在图5a中表示在成为反交织对象的数据尺寸大(交织块长度大)的情况下以一次的数据包发送的数据。这样，若数据尺寸大，则如图5b所示，即使存在数据包丢失，也由于其位置在不同的行是散乱的，故能进行纠错。因此，可以抑制内容数据的损失，可以进行稳定的再生。
但是，如果增大成为反交织的对象的数据尺寸，则在数据取得比较费时间，导致到再生开始为止的待机时间延长。因此，如图6a所示，若缩小成为反交织的对象的数据尺寸，则取得数据的时间变短，但是如图6b所示，如果发生数据包丢失，则丢失数据的部位就会集中到同一行。因此就无法进行纠错，结果声音、图像就会发生混乱。
发明内容
本发明的目的在于，提供一种既可以缩短内容再生开始时的待机时间，又可以在内容再生开始后达成图像、声音的稳定化的宽波段广播对应接收机。
本发明是一种宽波段广播收发系统中的宽波段广播对应接收机，该系统具备：内容服务器；和通过互联网连接到内容服务器上的宽波段广播对应接收机，所述内容服务器具备：发送将所述宽波段广播对应接收机所要求的尺寸的内容数据进行过交织的数据的功能，所述宽波段广播对应接收机具备通过将所接收的内容数据进行反交织处理而恢复原来内容的功能，其特征在于，具备改变向所述内容服务器要求的内容尺寸的内容尺寸控制机构。
作为所述内容尺寸控制装置，采用的是例如，在刚选择完应取得的内容之后，将向所述内容服务器要求的内容尺寸设定为小于预先确定的规定尺寸，然后，逐渐增大向所述内容服务器要求的内容尺寸，直到成为所述规定尺寸为止的方法。
附图说明
图1是表示一维数据、以及将一维数据进行二维表示的示意图。
图2是表示在图1的二维排列数据的各行上附加4字节的奇偶位的状态的示意图。
图3是表示利用交织的数据读入方法的示意图。
图4是表示内容数据的收发形态的示意图。
图5a是表示交织块长度n大时的二维排列数据的示意图。
图5b是表示在图5a所示的交织块长度n大时的二维排列数据中，即使存在数据包丢失，也由于其位置分散在不同的行，而能进行纠错的示意图。
图6a是表示交织块长度n小的情况下的二维排列数据的示意图。
图6b是表示在图6a所示的交织块长度n小时的二维排列数据中，若发生数据包丢失，则由于消失的数据的部位集中在同一行，而无法进行纠错的示意图。
图7是表示用于选择宽波段广播的内容(节目)的菜单画面的一例的示意图。
具体实施方式
以下，对本发明的实施例进行说明。
宽波段广播系统的构成，如图4所示，由内容服务器1、通过互联网2连接到内容服务器1上的宽波段广播对应的数字电视接收机3构成。另外，数字电视接收机3也具备接收数字卫星广播的功能。
数字电视接收机3的接收方式成为数字卫星广播接收方式，由数字电视接收机3接收数字卫星广播。即，数字电视接收机3的用户可以视听数字卫星广播的节目。若用户通过操作没有图示的遥控器，而将数字电视接收机3的接收方式切换成宽波段广播接收方式，则数字电视接收机3对内容服务器1进行取得菜单画面的数据的动作。若数字电视接收机3接收菜单画面的数据，则如图7所示，显示菜单画面。
若在该菜单画面上用户选择所希望的内容(节目)，则数字电视接收机3对内容服务器1，进行取得由用户选择的内容(节目)的动作。
此时，如果是以往，数字电视接收机3为了进行没有混乱的稳定的再生而要求充分的尺寸，比如要求10秒钟的数据(以下称其为最大尺寸的数据)。但是，这样，由于接收尺寸大，故会在数据接收上花费时间。
因此，在本实施例中，要求能再生且尽量小的尺寸，比如要求1秒钟的数据(以下称之为最小尺寸数据)。若这样地缩小接收尺寸，则虽然存在由数据包丢失等错误造成再生混乱的可能性，但接收时间缩短了。这样，在再生开始时缩小接收尺寸，是考虑到在再生开始时，比起稳定的再生，待机时间缩短更能够使用尸满意。
内容再生开始后，由于丝毫不改变现在的接收尺寸，容易产生错误，因此要增大接收尺寸。但是，如果突然增大尺寸，则即使完成了现在的内容的再生，用于显示后继的内容的准备(接收、反交织等)也没有完成，再生会中途切断。因此，要逐渐加大接收尺寸到现在的内容的再生完成为止，以便完成用于显示后继内容的准备，且减少由数据包丢失而引起的错误。然后，若接收尺寸成为最大尺寸，则以后就将接收尺寸固定在最大尺寸上。
对接收尺寸的计算方法进行说明。
(1)由用户选择了所希望的内容时的初次的接收尺寸的计算方法
由用户选择了所希望的内容时，数字电视接收机3取得对应于数字电视接收机3可以再生的最小尺寸的时间，求出向服务器1发送的要求尺寸的初始值。
对应于数字电视接收机3可以再生的最小尺寸的时间，依赖于数字电视接收机3，并预先存储在数字电视接收机3内的存储机构中。向服务器1发送的要求尺寸，如以下的公式(1)所示，根据内容的位速率、对应于数字电视接收机3可以再生的最小尺寸的时间(sec)而算出。另外，内容的位速率可以事先取得，并预先存储在数字电视接收机3内的存储机构中。
要求尺寸(位)＝内容的位速率(bit/sec)×对应于最小尺寸的时间
(sec)                                  …(1)
这样，求出要求尺寸后，数字电视接收机3仅以算出的要求尺寸向服务器1要求由用户选择过的内容。服务器1发送数字电视接收机3所要求的要求尺寸份的该内容。
数字电视接收机3接收从服务器1送来的所述要求尺寸份的数据，并通过反交织处理而复元接收数据。
(2)初次以后的接收尺寸的计算方法
对第二次的要求尺寸的计算方法进行说明。将从本次的数据要求接收数据并通过反交织处理而恢复接收数据为止的时间作为本次的过程时间。另外，如以下的公式(2)、(3)所示，将从作为本次取得数据的AV内容的再生时间(输出时间)中减去本次的过程时间的值作为剩余时间。而且，若将向服务器要求发送数据的时刻作为过程开始时刻，将进行接收数据的反交织并完成数据的恢复的时刻作为过程完成时刻，则本次的过程时间，作为(过程完成时刻-过程开始时刻)来求出。
剩余时间(sec)＝再生时间(sec)-本次的过程时间(sec)…(2)
再生时间(sec)＝接收尺寸(bit)/位速率(bit/sec)    …(3)
如以下的公式(4)所示，从位速率和剩余时间求出在本次的数据接收中可以更富裕地取得的尺寸(以下称多余尺寸)(bit)。
多余尺寸(bit)＝位速率(bit/sec)×剩余时间(sec)   …(4)
下次的要求尺寸，根据公式(5)算出。
下次的要求尺寸(bit)＝本次的要求尺寸(bit)+(多余尺寸(bit)×α)                                               …(5)
其中，α是预先设定的常数，0＜α＜1。将α设定为比1小的值，是考虑到由纠错、互联网通信量的流动性变化等，而过程时间动态变化的缘故。
这样，算出下次的要求尺寸后，判定算出的下次的要求尺寸是否为最大尺寸以上。如以下公式(6)所示，从对应于预先设定的最大尺寸的时间和内容的位速率算出最大尺寸。
最大尺寸(bit)＝内容的位速率(bit/sec)×对应于最大尺寸的时间(sec)                                                …(6)
在算出的下次的要求尺寸比最大尺寸小的情况下，向服务器要求算出的下次的要求尺寸份的数据。在算出的下次的要求尺寸为最大尺寸以上的情况下，向服务器要求最大尺寸份的数据。另外，在算出的下次的要求尺寸成为最大尺寸以上的情况下，在以后的时间，将下次的要求尺寸固定为最大尺寸。

Claims (2)

1.一种宽波段广播对应接收机，其是宽波段广播收发系统中的宽波段广播对应接收机，该系统具备：内容服务器；和通过互联网连接到内容服务器上的宽波段广播对应接收机，所述内容服务器具备：发送将所述宽波段广播对应接收机所要求的尺寸的内容数据进行过交织的数据的功能，所述宽波段广播对应接收机具备通过将所接收的内容数据进行反交织处理而恢复原来内容的功能，其特征在于，
具备：改变向所述内容服务器要求的内容尺寸的内容尺寸控制机构。
2.根据权利要求1所述的宽波段广播对应接收机，其中，所述内容尺寸控制机构，在刚选择完应取得的内容之后，将向所述内容服务器要求的内容尺寸设定为小于预先确定的规定尺寸，然后，逐渐增大向所述内容服务器要求的内容尺寸，直到成为所述规定尺寸为止。
CNB200410075257XA 2003-09-12 2004-09-13 宽波段广播对应接收机 Expired - Fee Related CN100394712C (zh)

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