专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO1994017630A1 APPARATUS AND METHOD FOR SELECTIVELY DEMODULATING AND REMODULATING ALTERNATE CHANNELS OF A TELEVISION BROADCAST 审中-公开
标题翻译：用于电视广播的选择性解调和重构替代频道的装置和方法
公开(公告)号：WO1994017630A1
公开(公告)日：1994-08-04
申请号：PCT/US1994000593
申请日：1994-01-27
申请人： SCIENTIFIC-ATLANTA, INC.
发明人： SCIENTIFIC-ATLANTA, INC. , INGRAM, Eric, James , FARMER, James, O.
IPC分类号： H04N05/60
CPC分类号： H04N19/597 , H04N5/44 , H04N5/607 , H04N5/62 , H04N7/06 , H04N13/156 , H04N13/161 , H04N13/194
摘要： An apparatus and method for demodulating and remodulating a transmitted signal prior to presentation to a television receiver, the transmitted signal comprising a video signal, a first channel signal, and a second channel signal, wherein one of the two channel signals is selected, demodulated and remodulated with the video signal prior to presentation to the television receiver. The apparatus allows the viewer of a television receiver which accepts a single channel signal to select between one of two alternate channels signals associated with a video broadcast without the need to modify the television receiver. The apparatus is particularly well suited for television broadcasts using a dual carrier transmission format. A novel varactor diode tuning means is used in one embodiment for changing the center frequency of a frequency modulation demodulator. The disclosed apparatus also transparently allows stereo demodulation for television receivers which are capable of such stereo demodulation.
摘要翻译：一种用于在呈现给电视接收机之前对发射信号进行解调和再调制的装置和方法，所发送的信号包括视频信号，第一信道信号和第二信道信号，其中两个信道信号之一被选择，解调和在呈现给电视接收机之前用视频信号再调制。该装置允许接收单个信道信号的电视接收机的观看者在与视频广播相关联的两个替代频道信号中的一个之间进行选择，而不需要修改电视接收机。该装置特别适用于使用双载波传输格式的电视广播。在一个实施例中使用新的变容二极管调谐装置来改变频率调制解调器的中心频率。所公开的装置还透明地允许能够进行这种立体声解调的电视接收机的立体声解调。

IPRDB

热门服务

关于我们

友情链接

联系方式