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    • 4. 发明授权
    • Audience rating system for digital television and radio
    • 数字电视和广播的观众评级系统
    • US5974299A
    • 1999-10-26
    • US85501
    • 1998-05-27
    • Enrico Emilio Massetti
    • Enrico Emilio Massetti
    • H04H60/21H04H60/37H04H60/49H04H60/66H04N21/41H04N21/426H04N21/434H04N21/442H04N7/16
    • H04H60/49H04H60/37H04N21/4104H04N21/4263H04N21/434H04N21/44222H04H60/21H04H60/66
    • An audience rating system for digital television and radio, using identification codes in control streams of time-multiplexed digital transmissions. When a television set or radio, that is being monitored pursuant to the system, is turned on and tuned into a channel, and each time that the channel is changed, an identification code for each audio, video or auxiliary digital stream of the channel is extracted from the control stream, and recorded along with the time. The time is also recorded when the television set or radio is turned off. This data makes it possible to determine what stations, channels, and programs members of the audience being monitored are watching or listening to at any particular time. In the first preferred embodiment, the multiplexed digital transmission is received separately by the television set or radio (or an attached IRD) and a meter connected to it. The meter compares digital streams of the channel being received by the television set or radio with digital streams of each of the channels in the multiplexed digital transmission, until it finds a match. In the second preferred embodiment, the meter does not receive the multiplexed digital transmission separately, but has access to elementary streams extracted from the transmission by an IRD, and extracts identification codes for the channels being received from their elementary streams. The elementary stream may be accessed through an auxiliary connector in a digital decoder, through an access control card connector, or through soldering electrical connections to internal points in the IRD.
    • 用于数字电视和无线电的观众评级系统,使用时间多路复用数字传输的控制流中的识别码。 当根据系统监视的电视机或无线电台被打开并被调谐成频道时,并且每当频道改变时,频道的每个音频,视频或辅助数字流的识别码是 从控制流中提取,并随时间记录。 当电视机或收音机关闭时也记录时间。 该数据使得有可能确定在任何特定时间被监视的观众的观众或观众的成员正在观看或收听。 在第一优选实施例中,通过电视机或无线电(或连接的IRD)和连接到其的仪表单独接收多路复用的数字传输。 该仪表将通过电视机或无线电接收的频道的数字流与多路复用数字传输中的每个频道的数字流进行比较,直到找到匹配。 在第二优选实施例中,仪表不单独接收多路复用的数字传输,而是可以访问由IRD从传输提取的基本流,并且从其基本流中提取正在接收的信道的识别码。 基本流可以通过数字解码器中的辅助连接器,通过访问控制卡连接器,或通过焊接到IRD中的内部点的电连接来访问。