CN1047599A - 具有可编程背景伴音或图象的交互式电视终端 - Google Patents

具有可编程背景伴音或图象的交互式电视终端 Download PDF

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CN1047599A
CN1047599A CN90103913A CN90103913A CN1047599A CN 1047599 A CN1047599 A CN 1047599A CN 90103913 A CN90103913 A CN 90103913A CN 90103913 A CN90103913 A CN 90103913A CN 1047599 A CN1047599 A CN 1047599A
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李·R·约翰孙
伊丽莎白·A·史密夫
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • 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
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4112—Peripherals receiving signals from specially adapted client devices having fewer capabilities than the client, e.g. thin client having less processing power or no tuning capabilities
    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
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    • H—ELECTRICITY
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
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    • 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
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Abstract

在一种电视终端中使用的装置，它可选择地提供背景音频或视频信号，或是两者均提供，以伴随文字信息的屏幕显示。该装置包括一个调谐电路，用于调谐到一个由用户选择的用于显示一个特定文字信息屏幕的预选背景频道上。结果，配餐音乐便可以伴随着与选择菜肴有关的文字信息屏幕。另一方面，关于如何付费观看一部电影的说明可能在背景中由该部电影陪衬着。可者电影画面或者声音，或是两者，都可以伴随着说明屏幕。

Description

本发明为1988年12月23日递交的申请号为No.289218，标题为“自动交互式电视终端配置”的美国申请的部分后续申请，并且与同时递交的下述申请有关：美国申请号-，（代理号25871），标题为“电缆电视事务处理终端”;美国申请号-，（代理号25875），标题为“用于交互式电视终端的存贮控制方法和装置”;美国申请号-，（代理号25872），标题为“终端授权方法”;美国申请号-，（代理号25878），标题为“交互式房间状态/时间信息系统”和美国申请号-，（代理号25874），标题为“终端查询方法”。
本发明主要涉及通过电视设施为用户提供双向交互式娱乐系统，更具体地说，涉及产生可编程背景音频或视频信号，以便在相应的电视接收机上作为背景显示的终端方法和装置。
双向交互式电缆电视系统被用来通过电缆设施向众多的用户传送娱乐节目，信息和数据已经是公知的。数据可以通过一分离的数据频道，带外的或者视频信号内的所谓“带内”数据频道。例如，在垂直消隐时间内，传送或输送给一特定的用户。在下游方向，编址控制数据可以代表授权给一个特定终端的服务或者代表给该终端的控制指令。在上游方向即从终端向服务提供者或系统管理器的方向，控制数据可以代表用户在响应轮询请求或在用户选择时间所进行的选择。
终端经常被制成具有唯一的识别编码，为了保密的目的，这些编码可以不让用户知道。即便如此，对于系统管理器来说，该唯一的识别编码是必要的，以便为系统中的终端编址。当终端请求视频和音频服务时，地址被用于具体地指示被请求服务的目标，以便可以把与传送所需服务相关的信息传送给发出请求的终端。
在电视文字广播服务的例子中，至少是文字字符的画面被传送到终端，并且在相应的电视接收机上显示出来。根据（Campbell    etal.）美国专利4，536，791，一个可编址电缆电视终端包括有一个文字/图形发生器。包含控制和文字信号的数据信号被插入在发送到终端的电视信号的扫描期间。此外，以视频线路形式的全频道电视文字广播数据被发送到专用于文字频道的终端上。从被传送的电视信号中恢复的数据可以叠加在电视频信号产生的图象上。例如，从扫描期间中恢复的一个频道号码，能够在前景中出现，一个调谐到的节目出现在显示的背景中。
众所周知，电视接收机可以有选择地调谐一个伴随着视频节目的无线广播音频信号。以这种方式，可以为那些伴音既不是立体声又不是所选语言的电视节目提供立体声伴音或者是一种外语伴音。
然而，在这一技术领域存在着一种在视频节目或伴音节目或两者之上有选择地叠加文字为附加文字画面的需求。例如在收费电视节目服务的提供中，文字指示可选择地和可编程地被显示在前景中，并且收费节目的预看出现在具有或者没有伴音的背景中。在提供饭店客房服务和做用餐饮食选择广告的电视文字广播的画面中，当它们被显示时，来自配餐音乐伴音频道的配餐音乐可以被调谐和在背景中播放，并且伴随着客房服务的电视文字广播画面。
本发明的一个任务是提供一种交互式终端，用于可变换地提供伴随前景字幕的背景音乐。
本发明的一个任务是提供一种交互式终端，用于可变换地提供伴随前景字幕的背景图象（video）。
本发明的一个任务是提供一种交互式或终端，用于可变换地提供背景伴音（audio）或影象，或者按照预先编程信息可变换地提供与字幕相关联的背景伴音和图象。
为了实现这些目的，本发明一个进一步的目的是提供一种在背景中伴随字幕能实现预先编程图象或伴音或者两者都有的方法。
按照本发明使用在电视终端中的装置包括一个在处理器控制下的第一开关，用于转换一个可编程所选频道，该频道可以包括有用于显示的音频或视频信号或者两者都存在。一个在处理器控制下的第二开关转换电视文字广播发生器的一个可编程所选输出。第一和第二开关的输出经一加法电路被用于显示。
在按照一系统管理器地址存贮在存贮器中的电视文字广播屏幕形成期间，一个字幕样板被完成，在字幕中该样板与一个背景伴音/图象频道的指示相关联，从而，当一个终端需要该字幕样板时，背景频道指示就从系统管理器那检索，并且随着所需的字幕局部地存贮在终端存贮器中，不论背景伴音产生与否，背景频道指示也要被存贮。
因此，按照本发明的方法，当用户选择了用来显示的特定的一幕时，在系统管理器编程的图象和/或伴音或者两者将作为背景伴随这一幕。此外，如果一个特定的电视文字广播服务与被连续显示的数幕相关联时，在这一串屏幕的显示过程中，背景以伴音或图象或者两者都有的形式将连续地被提供。
从下面对附图的详细描述，本发明的这些和其他特征将会变得越加明显。
图1是按照本发明在饭店或医院环境系统中提供的一种包括有双向交互式终端的交互式娱乐系统的方框原理图;
图2是按照本发明的一个双向交互式终端的方框原理图，它包括有一个微处理器，一个存贮器，一个调谐器，一个字符发生器，多个开关和一个连至相关电视接收机的电视信号输出端;
图3是图2所示终端的一个简化原理图，该图中描述了本发明的基本元件;和
图4（a）和4（b）分别表示了按照本发明的一个电视文字广播屏幕显示，图4（a）是背景伴音的范例，而图4（b）是背景图象，或背景伴音和图象的范例。
参考图1，这里示出了一个交互式娱乐系统的方框原理图，该交互式娱乐系统包括按照本发明的终端装置。这里所描述的娱乐系统与它在饭店或医院系统的环境中的应用有关，然而，本发明并不受此限制。本发明还可以应用在任何双向交互式娱乐系统中或者应用在单向非交互式娱乐系统中，诸如包含具有中继线和光缆或同轴电缆的馈线电缆的分配网络的电缆电视或卫星电视娱乐系统。例如，卫星接收器和解码器3，电缆接收器和解扰码器（descrambler）4，视频调制器5，可编址发送器接收器10，本地产生视频调制器11，和系统管理器都可以设置在一个电缆电视系统头端位置上。在该实例中，同轴电缆或光纤线路6把电缆电视头端连接到设置在单独的用户房屋中的娱乐系统的双向交互式终端7，8或9上。
另一方面，图1所示系统是本发明在饭店或医院娱乐系统中应用的范例。因此，传输线路6可以只包含一个同轴或光纤电缆连接在娱乐控制中心与N个终端，例如设置在上述设施房间内的终端7，8或9之间。
特别地，在系统控制中心，一个卫星信号可以被卫星天线2接收，然后在卫星接收器解码器3被接收和解码，以便经调制器5通过分配电缆6分配到本发明的交互式终端7，8或9。此外，电缆设备1接收的电缆电视频道中的一个频带被接收，如果必要，在电缆接收器/解扰码器4中对其进行解扰。被解扰的视频信号然后由调制器5调制，通过设备6分配到交互式终端7，8或9上。如果需要的话，可以提供一个可供选择的扰码器，用于对交互式终端7，8或9进行扰码付费频道传输。当然，此时的终端7，8或9应当包括有能对已扰码付费频道传输进行解扰的解扰码器电路。这种电路即没有在图1也没有在图2中示出，但是在包含有向远端用户位置进行信号分配的系统中，最好应当使用这种电路。
按照图1示出的实施例，饭店或医院所在位置可以经链路14与其他饭店或医院连接。通过数据线路14，数据经在系统管理器上的调制解调器13可以被接收。以这种方式，饭店或医院系统管理器可以保持所有当前的特性状态和一个包括多个饭店的娱乐系统的所有交互式终端。例如，从形成娱乐计划安排表的网络控制中心，通过该数据传输线路可以对娱乐计划安排表进行分配。系统管理器12包括一个数据处理单元和用于存贮与所有在该系统中的终端相关联的状态和特性的适当的存贮器。系统管理器12还控制调制器11上的视频信道的产生，如果必要，通过双向交互式终端7，8或9的设备6给予发送。例如，如果这些终端不能自身产生字幕的话，特别地，调制器11具有产生用于驱动在终端位置的字幕选定显示的信号的能力，这些终端所在位置响应于系统管理器12的控制。
不需要产生用于传输给一个按照本发明的终端以便显示的全部字幕，这是因为终端（图2）包括有它自己的字符发生器204。从而，本地产生视频调制器（locally    generated    video    modulation）11可任选。系统管理器12并不产生字幕本身，而是为键盘终端操作，数据和指令产生一个样板，在便形成字幕，经可编址发送器10发送给一个按照本发明的交互式终端，在一个包括有不带字符发生器的终端和按照本发明的终端的“混合”系统中，本地产生视频调制器11应该是必备的。例如，或者由终端或者通过调制器11形成字幕，可以分别向客人或病人提供有关饭店或医院服务的信息。
按照图1，系统管理器12还控制一个可编址发送器/接收器10，用于把被唯一编址的编址通信发送给终端7，8或9和以随机的次数方式接收通信或响应在终端的轮询请求。按照图1，可编址发送器可以把已编址信息发送到一个独立的数据载波上，如在108MHz，并且接收来自在另一个具有25MHz的独立数据信道上的终端以所谓向上游的方向发送的信息。例如，向上游的通信可以包括按照由用户通过终端键盘输入的一个服务请求用名字或数字的形式把电视字幕传送给终端，以便存贮在终端存贮器中。在一个可替换的实施例中，所有向下游的通信可以在带内或者在一个特定的电视频道传输中发送，例如，在被发送的视频信号的水平或垂直间隔之内。因此，系统管理器12把控制数据输入给经调制器5或者11（未示出）传送的视频信号，在带内完成信号的传输。由于增加了数据承载容量，每一传送方向最好是使用独立的数据载波。对向上游方向的传送，可以使用电话线路或扩展频谱传送，作为一种对独立的数据频道的替代。
除了与交换式终端7，8或9进行特定的编址数据通信以外，系统管理器还可以对所有交互式终端进行全局选址通信，这种通信可以要求也可以不要求一个终端对其进行响应。例如这种全局通信可以选择一个代表在特定饭店系统中所有终端的一个全局地址，或者选择代表在该系统内具有共同兴趣的一组终端的一个组地址。
本发明所解决的问题是使经本发明的交互式终端的电视文字广播屏幕的显示来的便利，一个终端的用户通过按动开关接通电源和打开与他相关的电视接收机使其终端工作。该用户在多个可能的选择服务中挑选一项，如客房服务，每次付费观看，结帐，饭店信息的电话消息检索或者室内购物，然后启动电视文字广播服务。这些可供选择的项目仅仅是本发明可以便利提供的可能供选择的项目的范例。这里使用的电视文字广播屏幕（teletext    screen）一词是涉及交互式提供文字和图形在电视信号接收机上显示的技术述语。
为了说明电视文字广播服务提供背景伴音的原理，例如，用户可以要求用屏幕显示描述客房服务。存贮在终端7，8或9的存贮器中的样板和其他数据典型地由一个微处理器来处理，并且产生指令以便显示与客房服务相关的几幕画面中的第一幕。同时，对于频率或其他存贮用于背景伴音信道的调谐数据（turning    data），样板的数据被考虑。进而，考虑产生一个标记以表示背景伴音的实现。在微处理器的控制下，已编程的伴音信道被调谐并且伴随着显示的屏幕。
由终端7，8或9或者按照图2提供客房服务更详地见与本发明同时申请的申请序号为NO_，发明名称为“电缆电视处理终端”的美国专利申请，该专利申请在这里一并作为参考。
为了说明提供背景图象的原理，例如，用户可以要求显示一个只有用户付费才能特许观看的频道。与上述每次付费观看服务关联的屏幕显示与用户的需求相关联。一个屏幕样板从存贮器中检索用于显示，并可以看到“你现在收看的是免费试映，若购买，按买（buy）键”。相关的样板是将要作为电视文字广播屏幕背景显示的收费频道。取决于背景伴音是否能实现，用户还将能够听到节目的伴音。
参考图2，这里示出了按照本发明的一个双向交互式终端。如图1所示，该终端经设备6与视频调制器5，可编址发送器/接收器10和本地产生视频调制器11耦合连接（如果提供这些装置的话）。
特别地，本发明的双向交互式终端包括有一个上行/下行变换器201，用于变换经设备6接收的频道，以便在一个相关联的电视接收机（未示出）上显示，或者用于发送由数据发送器203调制到25MHz经设备6发送的数据。如前所述，该数据可以包含一个向终端存贮添加电视文字广播屏幕和相关数据的请求。经设备6接收的电视频道可以包括伴音，图象或者两者均有。上行/下行变换器201把数据转换到108MHz的独立数据载波上，以便在数据接收器203上解调和接收。被接收的电视娱乐信号（音频/视频）由上行/下行变换器201提供给解调器202，解调器202还提供上行/下行变换器201的自动频率控制和增益控制。解调器202经屏幕上字符发生器204把视频信号提供给频道3/4调制器205。以这种方式，屏幕上字符的生成可以迭加在一个输入视频信号上出现或者以电视文字广播屏幕的形式显示，例如，文字显示在一个平坦的彩色背景上。字幕（text    screen）也可以按照本发明由背景图象或伴音或两者都有来伴随。在解调器202上的基带伴音通道送到音频输出211或经频道调制器205以射频的方式发送到电视接收机。此外，基带视频输出213也可以经视频输出塞孔213由屏幕上字符发生器204提供。
本发明的交互式终端进一步包括一个处理器206，用于控制在数据/接收器发送器203的数据发送和接收。处理器206经门矩阵207还控制字符发生器204的字符生成。经门矩阵207，处理器206还控制一个键盘（key    pad）216，该键盘216可以直接与门矩阵耦合连接或经红外线或其他遥控传输链路接收器208进行耦合连接。由电容器218提供后备电源的随机存取存贮器（RAM）217存贮字符屏幕样板、数据和相关的指令，加载特性数据和其他通过数据传输链路经数据接收器203从响应处理器206控制的系统管理器接收的数据。处理器206还使用一个非易失随机存贮存贮器222和经门矩阵207使用一个外部只读存贮器（ROM）219。处理器206经红外线或其他遥控传输接收器208从一遥控键盘接收遥迭键控指令。处理器206还可以控制相位锁相环209和带通滤波器210的操作，以便控制向上/向下变换器201的操作。因此，任何输入的频道都可根据处理器206的要求进行调谐。
电力经一个交流电源输入端提供给电源215，电源215提供例如+5V和+12V的直流电压给需要上述电压的终端的各种组件。此外，输入给电源215的交流电源经一个受控转换插座214提供给相关的装置，例如与终端相关联的电视接收机。转换插座214的状态经门矩阵207由处理器206控制。例如，转换插座214可以连续地向与它关联的装置提供电力，或者仅当键盘216的“开”按钮处于打开状态或一个遥控键盘被置位于打开状态时才提供电力。
框内或与框内有关的数值是存贮器容量，时钟速率，或部件类型的范值。例如，使微处理器定时的时钟202可以工作在14.318MHz。时钟信号由门矩阵207分频，用于微处理器206的工作（微处理器206可以是Motorola    MC    6803U4），或者用于终端其他处理操作的定时。例如屏幕上字符发生器204可以是一个Mitsubishi    M50455元件。RAM217可以包括16K字节的存贮量，而ROM219包括有32K字节的存贮量。
除了字符生成和屏幕显示以外，例如，数个发光二极管221可以至少显示一种电源接通的状态，以及交替地显示所调谐频道的数值或者其它可用前景在屏幕上显示的数据。
参考图3，有关本发明图2终端的元件以简图的形式示出。上行/下行变换器201和解调器202仅用一个EIA（电子工业协会）频道调谐电路301代表。屏幕上的发生器204仅用屏幕生成电路302代表。图2中示出的稍微复杂的调谐控制在图3中仅示为第一通/断开关303。类似地，发生器204的电视文字广播输出的出现或不出现由第二通/断开关304表示。
简要地参考图2，解调器202的视频输出经发生器204提供用于显示。此外，发生器204也提供一视频信号的总和，它简单地由求和电路305表示。而且，门矩阵207经引线211或射频信号212，以伴音可转换提供的方式控制解调器，这种方式取决于是否按照本发明的背景伴音能够产生。
送到电视的输出可以是EIA单独调谐，单独屏幕生成，或者是屏幕生成和EIA调谐的一种混合。为了观看EIA视频信号，存贮在终端存贮器中的作为一个相应样板的屏幕标志必须被设置为“在屏幕上（on    screen）”。
背景伴音/象可以按照经电缆电视设备提供的频道范围内的任何EIA频道进行组合。伴音可以被单独地静噪。对于特定的一幕如果没有音量存在，即静噪，则终端键盘的音量上升和音量下降键对音量不起作用。然而，可以显示音量彩条。如果没有EIA频道被安排，则伴音被自动静噪。此外，如果屏幕标志为在屏幕上，则在缺少相就屏幕的调谐频率数据时，最终调谐的EIA频道将作为背景图象出现。
对于每次付费观看收费频道业务的操作，存在两个特定的EIA频道值。例如，因为存在不多数量的单独可配置的收费频道和只有一套与购买收费频道相关联的屏幕，所以对背景频道的特定处理的需要增加了。为了构成作为背景的视频信道为特定收费频道使用的交替视频频道，可以预先确定一个频道作为EIA频道。对于作为背景的收费频道本身，可以使用另一个收费频道。如果使用这些值而又不是在一个收费频道上，则最初被调谐的EIA频道将作为背景图象出现，并且伴音被静噪。如上表明的，加扰是任意选择的，并且仅对第二个收费频道背景加扰。
根据系统管理器的位置，电视文字广播屏幕的详细的设计和终端存贮器详细的屏幕优先次序，在与本发明同时申请，申请序号为No._的美国专利申请中作了描述，该专利申请在这里一并作为参考。然而，只要描述了屏幕样板的设计和按照屏幕编号把屏幕样板存贮在系统管理器存贮器中就够了。利用名称或相应屏幕区分的一个样板文件（file）决定着终端将采取什么行动来响应该终端键盘上键的动作。更确切地说，屏幕存贮器中相应的屏幕是一个终端应该调谐以获得背景伴音/图象的EIA频道频率。另一个存贮器标志指示背景伴音是否能够产生。在一个标志表中，进一步包含了关于“在屏幕上”状态被标识以指示由调谐数据表示频道的信息，或者如上所述的最终调谐的EIA频道作为背景频道出现的信息。
参考图4（a），这里示出了与饭店提供客房服务相关的一串画面中的第一幕。例如，由一用户调谐到显示客房服务的一个频道编号，该幕已面就被获得。由终端进行频道调谐与频道的编号无关。相反，根据存贮器内的频道映象图，已输入的频道编号可以与一个标识符相一致，作为起动用于显示客房服务的屏幕的特征。典型地，按照一个电视文字广播屏幕的优先权和控制表，尽可能多的显示不同服务开始的数幕画面被存贮在终端存贮器中。较低优先权的屏幕已面直到被请求或者直到它们被迫切地需要时才被存贮在系统管理器中。屏幕的优先权和控制安排在尚待批准的连续申请，申请序号为No._的美国专利申请中进一步被描述。
随后与客房服务有关的屏幕画面涉及选择正餐菜肴和例如为已选的食品，如咖啡用奶油和糖以及火候适度的牛排挑选更换食品（choosing    modifiers）。经电缆电视系统提供客房服务的描述在还没有批准的连续申请，申请号为No._的美国专利申请中进一步得到说明。
被描述的屏幕是屏幕编号500，它是描述客房服务的第一幕画面。存贮器中的相应屏幕500将作为一个标志，指示背景伴音能够产生。同时，例如配餐音乐经EIA频道33由系统管理器提供给终端。频道33还与存贮器中的屏幕500相关联。因此，当终端调谐到频道33的EIA频率时，伴随屏幕500的配餐音乐就会产生。当饭店客人做出他们的选择时，如果一系列显示客房服务的屏幕的画面顺序地为500，527，245和550，则频道33背景伴音将作为背景音乐持续播放。
用户可以使用他们的手持遥控器或终端键盘，通过操作适当的音量键来调整音量。同时，根据屏幕的键盘样板，其他键依据它们在屏幕上为buy或OK键的说明，可以具有不同的功能。
用户现在可以决定启动每次观看付费的付费频道业务。参考图4（b），最初的一幕指示屏幕编号为600。如果背景伴音能产生，这一幕将还有一个相应的背景EIA频道和背景节目伴音。试映的屏幕可以被定时，以便在预定的时间过后，将拒绝接受用户使节目出现在背景中。为一个预定时间期间可以与电视文字广播屏幕相关联，这个时间期间比试映时间稍长或稍短。例如，若稍长，则在试映完毕，屏幕将催促观看者按压buy键。若稍短，则在试映期间，可以显示一串屏幕画面，这串屏幕画面提供比只显示一幕画面更详细的指示。
这样，这里已经描述了使用在一种电缆电视终端中的装置，该装置用于规定一个背景音频/图象频道，终端应该调谐到这个频道，以便获得文字屏幕信息的背景音频/图象或者两者都能获得。以这种方式，例如，一个用户可以观看在一套文字指示背景中的一部电影，该套文字指示观看者如何付费观看这部电影。交替地，可以提供给观看者适当的背景音乐，以配合他从客房内服务菜单中挑选出正餐可供选择的食品。本发明所含原理的其他应用对于本领域的技术人员应该是显而易见的。

Claims (7)

1、在一种电视终端中使用的装置，用于可选择地提供一种背景视频或音频信号或是两者，以伴随在前景中的文字信息屏幕的显示，该装置包括：
调谐装置，用于调谐到一个预定的背景频道；
电视文字广播产生装置，用于产生前景显示信息；
与调谐装置和电视文字广播产生装置耦合连接的开关装置耦合连接的开关装置，用于选择地转换调谐装置的输出，作为电视文字广播产生装置的前景输出的一个背景显示；和
控制装置，响应用于显示一特定屏幕的文字信息的选择，用于控制开关装置和调谐装置。
2、根据权利要求1的装置进一步包括一个读/写存贮器，用于暂时存贮与特定文字信息屏幕相关的数据，该数据指示背景伴音是否能产生。
3、根据权利要求1的装置进一步包括一个读/写存贮器，用于暂时存贮与特定文字信息屏幕相关的数据，该数据指示调谐装置调谐到的预定频道。
4、根据权利要求3的装置进一步包括一个读/写存贮器，用于暂时存贮与特定文字信息屏幕相关的数据，该数据确定在背景中显示预定的频道还是终端调谐到的最后频道。
5、在一种电视终端中使用的装置，用于可选择地提供一种背景视频或音频信号或是两者，以伴随在前景中的文字信息屏幕的显示，该装置包括：
调谐装置，用于调谐到一个预定的背景频道;
第一开关装置，用于选择地转换调谐装置的输出;
电视文字广播生产装置，用于产生前景显示的文字信息;
第二开关装置，用于可选择地转换电视文字广播生产装置的输出;
求和装置，用一对第一和第二开关装置的输出求和;
控制装置，响应用于显示一特定屏幕的文字信息的选择，用于控制第一和第二开关装置和调谐装置，和
存贮装置，用于暂时存贮与特定文字信息屏幕相关的数据，该数据指示背景伴音是否要产生和调谐装置调谐到的预定频道。
6、在一种电视终端中使用的方法，用于选择地提供一种背景视频或音频或是两者，以伴随文字信息屏幕的显示，该方法包括下列步骤;
存贮一幕文字信息和一个预定背景频道的相关数据;
响应用户的选择，检索在前景中显示的文字信息;
调谐到作为背景的预定背景频道;和
选择地转换背景频道，以提供背景图象，背景伴音或两者。
7、在终端用于用背景伴音伴随一特定电视文字广播服务的方法，电视文字广播服务包括多个相应的屏幕，该方法包括下列步骤：
把一预定背景音频信道与多个和特定电视文字广播服务相关的屏幕中的每一幕相联系;和
在与特定电视文字广播服务相关的任何屏幕画面的显示期间，调谐到背景音频频道。
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Cited By (3)

* Cited by examiner, † Cited by third party
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CN1065101C (zh) * 1995-08-16 2001-04-25 Lg电子株式会社 选择电视接收机的图像模式的方法和装置
CN100351911C (zh) * 1995-08-21 2007-11-28 松下电器产业株式会社 根据交互控制实现意外性场景展开的多媒体光盘再生装置
CN101692704B (zh) * 1998-07-14 2012-11-28 联合视频制品公司 交互式电视节目导视系统及其方法

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US4991011A (en) 1991-02-05
WO1990013204A1 (en) 1990-11-01
CA2014796A1 (en) 1990-10-20

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