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    • 2. 发明申请
    • ENCODING AND DECODING OF EMBEDDED DATA STREAM IN ANALOG VIDEO USING COPY PROTECTION PULSES
    • 使用复制保护脉冲在模拟视频中编码和解码嵌入式数据流
    • WO2009149122A2
    • 2009-12-10
    • PCT/US2009/046024
    • 2009-06-02
    • MACROVISION CORPORATIONCLOUTMAN, John
    • CLOUTMAN, John
    • H04N7/167H04N5/913H04N7/24
    • H04N7/083H04N5/913H04N2005/91314
    • Method and apparatus for encoding and decoding a stream of digital (binary) data on AGC (automatic gain control) pulses or back porch pulses of the type conventionally used for copy protection in the analog television or video realm. The data is encoded onto the tips of the AGC or back porch pulses added to blanking intervals of an analog video signal. Each pulse tip may define, for instance, 10 to 15 digital bits (1 or 0) in the form of square waves or rectangular waves with two states, high and low, representing respectively 1 and 0. In another version, the digital data is similarly encoded onto the pulse tip of back porch pulses present at the end of video fields for copy protection. This digital data conveyed in an analog signal may be read by an associated decoder in a consumer device and the resulting data decoded, for instance, for copy control, storage permission, network access, user identification, or carrying additional data, such as commentary or text relevant to the accompanying video. The data bandwidth here is substantial since each AGC or back porch pulse may carry, for instance, 15 bits of digital data and the AGC or back porch pulses may be present in each of the horizontal and vertical blanking intervals of a video signal.
    • 用于在模拟电视或视频领域中常规用于复制保护的类型的AGC(自动增益控制)脉冲或后沿脉冲上对数字(二进制​​)数据流进行编码和解码的方法和装置。 数据被编码到添加到模拟视频信号的消​​隐间隔的AGC或后沿脉冲的尖端上。 每个脉冲尖端例如可以以方波形式或矩形波形式形成10到15个数字位(1或0),其中两个状态分别为1和0。在另一个版本中,数字数据是 类似地编码在存在于视频场结束处的后沿脉冲的脉冲尖端以进行复制保护。 在模拟信号中传送的数字数据可以由消费者设备中的关联解码器读取,并且所得到的数据被解码,例如用于复制控制,存储许可,网络访问,用户标识或携带附加数据,例如评论或 与随附视频相关的文字。 这里的数据带宽是重要的,因为每个AGC或后沿脉冲可以携带例如15位的数字数据,并且AGC或后沿脉冲可以存在于视频信号的每个水平和垂直消隐间隔中。