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    • 5. 发明授权
    • Extended definition widescreen television system using plural signal
transmission channels
    • 使用多信号传输通道的扩展定义宽屏电视系统
    • US4888641A
    • 1989-12-19
    • US252340
    • 1988-10-03
    • Michael A. IsnardiTerrence R. SmithJack S. FuhrerBarbara J. Roeder
    • Michael A. IsnardiTerrence R. SmithJack S. FuhrerBarbara J. Roeder
    • G06T9/00H04N7/26H04N7/46H04N11/24
    • H04N11/008H04N11/004H04N19/577H04N19/30
    • A system for transmitting and receiving signals representing a high-definition television (HDTV) image is disclosed. The signals are sent over two conventional 6 MHz NTSC channels. A first signal, the main signal, is developed by encoding circuitry from HDTV source signals to be compatible with existing NTSC receivers in that it produces a display on those receivers which is not significantly distorted. The main signal includes psychophysically hidden video information which may be used by an extended definition receiver to produce a widescreen image having a higher level of detail than a conventional video image. A second signal, the auxiliary signal, is developed at the transmitter by decoding the main signal and subtracting the decoded main signal from the original HDTV source signals. The auxiliary signal, which includes frequency components from 0 Hz to 20 MHz is split into three bands, A (0 Hz-6MHz), B (6 MHz-12 MHz) and C (12 MHz-18 MHz). Bands B and C are frequency converted to occupy the 0 Hz-6 MHz band and are time division multiplexed on a line by line basis. The combined B and C bands are then time division multiplexed with the A band on a frame by frame basis for still images. For moving images, only the A band is sent. The receiver decodes the main signal, and, using a motion signal sent with the main signal, decodes the auxiliary signal. The decoded main and auxiliary signals are combined to reproduce the HDTV image.
    • 公开了一种用于发送和接收表示高分辨率电视(HDTV)图像的信号的系统。 信号通过两个常规的6 MHz NTSC通道发送。 第一个信号,主要信号,由HDTV源信号的编码电路开发,以与现有的NTSC接收机兼容,因为它在这些接收机上产生不显着失真的显示。 主要信号包括心理物理隐藏的视频信息,其可由扩展定义接收机使用以产生具有比常规视频图像更高的细节水平的宽屏幕图像。 通过对主信号进行解码并从原始HDTV信号中减去解码的主信号,在发送器处产生第二信号辅助信号。 包括0Hz至20MHz频率分量的辅助信号分为A(0Hz-6MHz),B(6MHz-12MHz)和C(12MHz-18MHz)三个频带。 频带B和频段C被频率转换成占用0Hz-6MHz频带,并逐行进行时分复用。 然后,对于静止图像,组合的B和C频带逐帧地与A频带进行时分复用。 对于运动图像,只发送A波段。 接收机解码主信号,并使用与主信号一起发送的运动信号,对辅助信号进行解码。 解码的主和辅助信号被组合以再现HDTV图像。