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    • 26. 发明申请
    • METHODS AND APPARATUS TO IDENTIFY A TUNED DIGITAL TELEVISION CHANNEL
    • 识别数字电视频道的方法和设备
    • WO2005114880A1
    • 2005-12-01
    • PCT/US2004/013472
    • 2004-04-30
    • NIELSEN MEDIA RESEARCH, INC.RAMASWAMY, ArunCAVE, Mark Richard
    • RAMASWAMY, ArunCAVE, Mark Richard
    • H04J1/04
    • H04N21/44222H04N7/17309H04N21/4263H04N21/4345
    • Methods and apparatus to identify a tuned digital television channel are described herein (FIG. 1). In an example method, a tuned major channel is identified (510). Program identifiers (PIDs) associated with the tuned major channel are identified (520). Packets of minor channels associated with the tuned major channel from a multiplexed digital stream of major channels are extracted (530). At least one of the major channels includes minor channels. An audio stream from a digital audio output is extracted (540). Accordingly, a digital signature associated with the extracted audio stream is compared to digital signatures associated with the extracted packets of the minor channels associated with the tuned major channel to identify a tuned digital television channel (550).
    • 本文描述了用于识别调谐数字电视频道的方法和装置(图1)。 在示例性方法中,识别调谐主频道(510)。 识别与调谐主频道相关联的节目标识符(PID)(520)。 提取与主要信道的多路复用数字流相关联的与调谐主频道相关联的次要信道的分组(530)。 至少有一个主要频道包括次要频道。 提取来自数字音频输出的音频流(540)。 因此,将与提取的音频流相关联的数字签名与与提取的与调谐主频道相关联的次要频道的分组相关联的数字签名进行比较,以识别经调谐的数字电视频道(550)。