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    • 4. 发明授权
    • Communication of VBI data in digital television data streams
    • 数字电视数据流中VBI数据的通信
    • US5844615A
    • 1998-12-01
    • US783432
    • 1997-01-16
    • Ray NuberKent Walker
    • Ray NuberKent Walker
    • H04N7/083H04N7/087H04N7/088H04N19/89H04N7/025
    • H04N19/89H04N19/61H04N19/107
    • A method and apparatus are provided for communicating VBI user information in digital television data streams via a generic syntax. The syntax allows the digital transport of virtually any type of user data that may be carried in the VBI portion of an analog television signal. A pixel generator is used to insert VBI lines into a digital video signal using information provided in the user portion of the digital data stream. The syntax provides the pixel generator with the start time of the first symbol, the number of pixels per symbol, the high and low levels to insert, the fraction of the symbol time that is transition time, the number of symbols to insert and the frame line number on which to insert the data.
    • 提供了一种通过通用语法在数字电视数据流中传送VBI用户信息的方法和装置。 该语法允许数字传输几乎可以在模拟电视信号的VBI部分中承载的任何类型的用户数据。 使用像素发生器使用在数字数据流的用户部分中提供的信息将VBI线插入到数字视频信号中。 该语法为像素生成器提供第一个符号的开始时间,每个符号的像素数,插入的高电平和低电平,转换时间的符号时间的分数,插入的符号数和帧 要插入数据的行号。
    • 5. 发明授权
    • Acquisition and tracking of independent quadrature modulated bitstreams
    • 独立正交调制比特流的采集和跟踪
    • US5398237A
    • 1995-03-14
    • US65578
    • 1993-05-26
    • Mark K. EyerPaul MoroneyKent WalkerHarris SimonStephen K. How
    • Mark K. EyerPaul MoroneyKent WalkerHarris SimonStephen K. How
    • H04L1/00H04L5/12H04L7/02H04L7/04H04N21/2383H04N21/438H04J11/00
    • H04L1/0068H04L1/0045H04L5/12H04N21/2383H04N21/4382H04L7/02H04L7/04
    • A desired information stream is recovered from a pair of independent bitstreams transmitted using quadrature modulation. One of the independent bitstreams is altered by an invertible alteration function prior to transmission. The quadrature modulated bitstreams are demodulated at a receiver to provide a demodulated I bitstream and a demodulated Q bitstream. One of the demodulated I and Q bitstreams is tentatively provided for decoding. The tentatively provided bitstream can be optionally inverted. One of the tentatively provided bitstream and the optionally inverted bitstream is decoded if it is desired to recover the bitstream that was not altered by the alteration function prior to transmission. One of the tentatively provided bitstream and the optionally inverted bitstream is decoded after applying the inverse of the alteration function thereto if it is desired to recover the bitstream that was altered by the alteration function prior to transmission. An error rate of data decoded during the decoding step is determined. If the error rate is not acceptable, different choices of the demodulated I and Q bitstreams with and without inversion are tried until an acceptable error rate is obtained.
    • 从使用正交调制发送的一对独立比特流中恢复期望的信息流。 在传输之前,独立比特流之一被可逆的改变功能改变。 正交调制比特流在接收机处被解调,以提供解调的I比特流和解调的Q比特流。 解调的I和Q比特流之一被暂时提供用于解码。 暂时提供的比特流可以任选地反转。 如果希望在传输之前恢复未被改变功能改变的比特流,则暂时提供的比特流之一和可选地反转的比特流被解码。 如果希望在传输之前恢复由改变功能改变的比特流,则将暂时提供的比特流和可选地反转的比特流中的一个在应用改变函数的逆之后进行解码。 确定在解码步骤期间解码的数据的错误率。 如果错误率是不可接受的,则尝试使用具有和不具有反转的解调的I和Q比特流的不同选择,直到获得可接受的错误率。