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1. 发明授权

US4870489A NTSC compatible HDTV transmission system 失效
标题翻译： NTSC兼容的HDTV传输系统
公开(公告)号：US4870489A
公开(公告)日：1989-09-26
申请号：US247704
申请日：1988-09-22
申请人： Robert P. Ducret
发明人： Robert P. Ducret
IPC分类号： H04N7/01 , H04N7/015 , H04N11/24
CPC分类号： H04N11/002 , H04N7/01 , H04N7/015
摘要： An HDTV signal is converted to an NTSC bandwidth by analog encoding changing its conventional serial element format to a parallel element format. The picture elements of several HDTV scan lines are combined by fractal scanning and all simultaneously expressed over the time period of one NTSC scan line as individual frequency components within a given spectrum every component maintaining a constant amplitude corresponding to its original modulation level. The procedure is repeated at the NTSC scan line rate. The encoder controls the number of individual frequency components to achieve an HDTV level of information transmission and the frequency spacing between the individual frequency components to effect a bandwidth compression to NTSC levels. A decoder changes the received parallel element format to a serial element format and uses fractal scanning to separate the combined lines for conventional presentation. The parallel element format of the signal is not detectable by the serial element decoding of a conventional NTSC receiver and the fractal scanning is not definable through conventional scanning methods. The HDTV signal encoded by this method is therefore transmitted in the same channel as an existing NTSC transmission and the existing NTSC transmission uses fractal scanning to increase its own informational content to independent HDTV levels while maintaining an NTSC bandwidth.
摘要翻译：通过将其常规串行元素格式改变为并行元素格式的模拟编码将HDTV信号转换为NTSC带宽。几个HDTV扫描线的像素通过分形扫描组合，并且在一个NTSC扫描线的时间周期内同时表示为给定频谱内的各个频率分量，每个分量保持与其原始调制水平相对应的恒定幅度。以NTSC扫描线速率重复该过程。编码器控制各个频率分量的数量，以实现信号传输的HDTV电平以及各个频率分量之间的频率间隔，以实现NTSC电平的带宽压缩。解码器将接收的并行元素格式改变为串行元素格式，并使用分形扫描来分离用于常规呈现的组合行。信号的并行元素格式不能通过常规NTSC接收机的串行元素解码来检测，并且通过常规扫描方法不能定义分形扫描。因此，通过该方法编码的HDTV信号在与现有NTSC传输相同的信道中发送，并且现有NTSC传输使用分形扫描，以将其自己的信息内容增加到独立的HDTV电平，同时保持NTSC带宽。

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