CN1341323A - Tv接收器设备和相关的方法 - Google Patents

Tv接收器设备和相关的方法 Download PDF

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CN1341323A
CN1341323A CN00803645A CN00803645A CN1341323A CN 1341323 A CN1341323 A CN 1341323A CN 00803645 A CN00803645 A CN 00803645A CN 00803645 A CN00803645 A CN 00803645A CN 1341323 A CN1341323 A CN 1341323A
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signal
receiver
gps
antenna
video
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CN1190955C (zh
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A·T·于勒
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Pendragon wireless limited liability company
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Koninklijke Philips Electronics NV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • 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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42202—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS] environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
    • 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
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4627—Rights management associated to the content
    • 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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3805—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving with built-in auxiliary receivers

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Ecology (AREA)
  • Computer Security & Cryptography (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Remote Sensing (AREA)
  • Business, Economics & Management (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Emergency Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

给出了TV接收器设备(1)和相关方法,TV接收器设备包括一个接收从外部视频信号发射器发射的视频信号的视频信号接收器(2),一个接收从外部GPS信号发射器发射的GPS信号的GPS信号接收器,以及连接两个接收器的信号耦合装置(4)。信号耦合装置通过公共天线(5)为两个接收器提供各自所需的视频和GPS信号,天线适合接收陆地广播的视频信号。

Description

TV接收器设备和相关的方法
技术领域
本发明涉及由视频信号接收器和全球定位系统(GPS)信号接收器组成的电视(TV)接收器设备，以及相关的方法。
背景技术
当前，GPS最常和带有时间和测距的导航系统(NAVSTAR)GPS联系在一起，这是美国国防部研制和运行的全天候基于空间的导航系统，尽管GPS的基本原理是通用的，不仅仅限于NAVSTAR。因此，在这里GPS是指任何一个全球定位系统，系统包括多个在不同地点的CDMA无线发射器和一个根据无线发射器发射的到达时间间隔定位的接收器。
已经知道了实现GPS的基本原理及其实施的方法和设备。例如，参见GPS原理和应用(编辑，Kaplan)ISBN-0-89006-793-7，Artech House，以后简称“Kaplan”。
对于TV接收器设备，见US5621793(Bednarek等)，提供了带有GPS接收器的TV机顶盒，GPS可以定位TV机顶盒的位置。Bednarek给出了为提供TV访问控制和阻止窃取所使用的GPS接收器和机顶盒的定位知识。例如，接收来自GPS接收器的定位信息可以影响TV访问控制，并且，仅当当前位置和授权位置一致时，才能解密并显示输入的视频信号。本发明解决的技术问题
近来在GPS专用集成电路设计领域的进展使得GPS接收器信号处理部分可以相对廉价地生产。但是，不变的是，要为GPS接收器(无论与TV接收器设备集成与否)提供专用的GPS天线。因为GPS信号对于背景噪声而言信号强度非常低，特别是对于接收信号来自相对于接收器水平面小角度的卫星的情况，认为这样的天线是必须的。
对于卫星视频传输，Bednarek考虑了合成天线的方案(栏9的28到35行)，其中天线是小型的碟形卫星天线，它接收来自合成GPS/通信轨道卫星的GPS信号和通信信号。但是，象Bednarek在栏9的30到31行所指出的，这种天线结构的缺点在于通常卫星不合成GPS和通信功能。而且，假定为了定位，GPS接收器通常需要接收和跟踪来自至少4个非静止卫星的信号，而由于碟形卫星天线的视野很窄，Bednarek并没有明确如何使用一个碟形卫星天线工作。
本发明的目标之一是提供一个包括TV信号接收器和GPS信号接收器的廉价的TV接收器设备。
依据本发明，提供的TV接收器设备包括一个接收外部陆地视频信号发射器发射的视频信号的视频信号接收器，一个接收外部GPS信号发射器发射的GPS信号的GPS接收器，以及连接两个接收器的信号耦合装置，信号耦合装置通过公共天线为两个接收器提供各自的视频和GPS信号。
使用公共天线取消了专用GPS天线的需求。而且，许多家庭已经拥有了一个天线，经常是外置Yagi(八木)天线，用来接收陆地广播信号，因此可以很容易地连接到根据本发明的TV接收器设备，从而减少了安装费用。
设备包括一个天线，适宜用来最优地接收陆地广播的视频信号，特别是在UHF和VHF波段广播的信号。
为了简便，TV接收器设备和耦合装置可以容纳在同一个容器内，例如电视机顶盒或带有集成接收器的电视。
还提供了在TV接收器设备中接收视频和GPS信号的方法，TV接收器设备包括一个视频信号接收器和一个GPS信号接收器，两者通过信号耦合装置连接到公共天线，在理想状态下适用于最优地接收UHF或VHF视频信号。方法包括步骤(a)通过天线，在视频信号接收器中接收来自外部陆地广播的视频信号发射器的视频信号；以及步骤(b)，通过天线，在GPS信号接收器中接收来自外部GPS信号发射器的GPS信号。
附图说明
现在将参考附图，示例本发明的实施例，其中：
图1的简化方框图表示了包括依据本发明的TV接收器设备的TV机顶盒。
具体实施例
在图1中，TV机顶盒1包括一个TV信号接收器2和一个NAVSTAR GPS L1信号接收器3，其中，两个接收器通过公共天线馈线4接收各自的TV和GPS信号，馈线连接到机顶的记录周期性天线5上。
TV信号接收器2包括调谐装置，从多个陆地广播电视频道中选择(在控制单元6的信号控制之下)喜欢的一个频道，并预处理陆地广播的UHF视频信号和对应的音频信号，将它们输入控制单元6。
在GPS接收器3中，输入的GPS信号经过无源带通滤波器滤波，以减少带内的RF干扰，并放大，接着下行转换为中频信号(IF)。然后，一个模数转换器采样并数字化IF信号，输出给GPS信号处理器9。获得为寻找卫星的L1粗采集(C/A)码，并使用常规技术，从导航数据计算出伪测距并判决，以便确定机顶盒1的位置。将确定的位置输入控制单元6。
提供了用户界面7，以允许用户、通常是拥有者，输入一个代码，用于识别所希望的机顶盒1操作位置。只有在输入了个人识别号(PIN)之后，才能输入位置代码，个人识别号在理想状态下仅拥有者知道。在正确输入了PIN码和恰当的位置代码之后，位置代码被保存到位置代码EEPROM8中，可以由控制单元6访问。
控制单元6根据预先设置的操作模式控制TV机顶盒的操作。如果通过GPS信号处理器9接收到的位置和从EEPROM8中获得的位置代码不对应时，控制单元阻止TV信号接收器向TV信号处理器10提供TV信号。因此，机顶盒表现为不能操作。反之，如果，通过GPS信号处理器接收到的位置和从EEPROM中获得的位置代码一致时，控制单元允许向TV信号处理器发送TV信号，从而，TV信号处理器对信号适当地解码，通过视频/音频输出馈线11发送给外部电视(未在图中显示)。这样的访问控制可用于反窃取，也可以控制接入特定的电视台，例如，基于给定TV接收器位置注册的预付费频道。
在描述的例子中，TV机顶盒的操作是在TV信号接收器2和TV信号处理器10之间控制。当然，也可以在其他的阶段有效的控制TV机顶盒的操作，例如，禁止音频/视频解码或对TV显象管控制，或者中断电源。
虽然单独显示了用于获取和跟踪接收到的GPS信号的GPS处理器9，以及用于解码收到的TV信号的TV信号处理器10，它们也可以以一个单独的双用途微处理器的形式便利地提供。这样从使它更难以篡改或绕过访问控制的角度，提供了额外的安全。
NAVSTAR GPS L1信号是右手环形极化(RHCP)，在1,575.42MHz上发射。这对于专用于接收GPS信号的锥形螺旋线天线或变体是常规的。适于最优地接收陆地广播视频信号发射的天线在GPS信号频率上接收质量相对较低，测试表明，在1500MHz，顶置的记录周期性天线大约1％有效。但是，由于机顶盒通常固定使用，不象导航设备那样需要立即返回当前定位信息，因此可以通过增加信号采集周期来补偿无效性。例如，为了解扩NAVSTAR GPS信号，可以在几秒、例如2、5、10、20或更长、或者甚至数分钟、例如1、2或更长的时间段，将输入GPS信号的伪随机噪声码和本地产生的复制伪随机噪声码卷积。带有专用天线的常规NAVSTAR GPS接收器为了尽快获得信号码，卷积周期短，大约是10ms到1s。较长的卷积周期提供的理论增益在20到40dB。当然，低幅度扩频信号的获取方法是众所周知的。
当然，可以理解，本发明可以适用于不是TV机顶盒形式的TV接收器设备。例如，可以在带有集成接收器的电视、录象机(VCR)或类似的设备，或者任何能接收电视信号的设备上实现本发明。
除了上述的反窃取和访问控制应用，依据本发明的TV接收器设备也可以用于提供电视接收器功能和电视功能相对于位置的自动定制和设置。例如，自动调谐，其中，参照频率的存储器，以位置来选择和编程在一给定邻区内接收的电台频率；或者通过滤出TV信号提供的视频和音频隐含的信息，优先由图文电视提供的本地天气预报。

Claims (9)

1.TV接收器设备，包括一个接收从外部陆地视频信号发射器发射的视频信号的视频信号接收器，一个接收从外部GPS信号发射器发射的GPS信号的GPS信号接收器，以及连接两个接收器并通过公共天线为两个接收器提供各自的视频和GPS信号的信号耦合装置。
2.权利要求1所述的设备，其中TV接收器设备和耦合装置容纳在同一个容器内。
3.权利要求1或权利要求2所述的设备，进一步包括一个连接到耦合装置的天线，适于最优地接收陆地广播的视频信号。
4.权利要求3所述的设备，其中，天线适于最优地接收在UHF或VHF波段广播的视频信号。
5.依据前面任何一个权利要求所述的设备，进一步包括一个获取和跟踪接收的GPS信号的GPS处理器，和一个解码接收的TV信号的TV信号处理器，两者以一个单独的双用途微处理器的形式提供。
6.此前参考附图描述的设备。
7.在TV接收器设备中接收视频和GPS信号的方法，TV接收器设备包括一个视频信号接收器和一个GPS信号接收器，两者通过信号耦合装置连接到公共天线，所述方法包括步骤：
(a)通过天线，在视频信号接收器中接收外部陆地广播的视频信号发射器发射的视频信号；以及
(b)通过天线，在GPS信号接收器中接收来自外部GPS信号发射器的GPS信号。
8.依据权利要求7所述的方法，其中，天线适于最优地接收UHF或VHF视频信号。
9.此前参考附图描述的方法。
CNB008036454A 1999-12-11 2000-11-27 Tv接收器设备 Expired - Fee Related CN1190955C (zh)

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GBGB9929268.2A GB9929268D0 (en) 1999-12-11 1999-12-11 Tv receiver and related method
GB9929268.2 1999-12-11

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EP (1) EP1151604A1 (zh)
JP (1) JP2003516677A (zh)
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EP1151604A1 (en) 2001-11-07
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US6809775B2 (en) 2004-10-26
CN1190955C (zh) 2005-02-23
WO2001043428A1 (en) 2001-06-14
JP2003516677A (ja) 2003-05-13
US20010015772A1 (en) 2001-08-23

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