公开(公告)号：EP0266605A2

公开(公告)日：1988-05-11

申请号：EP87115198.1

申请日：1987-10-17

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Martin, Thomas F. ,  Fullingim, John P.

IPC分类号： H04N7/16

CPC分类号： H04N7/16

摘要： A cable television channel selector/descrambler enables the full capabilities of a cable-ready video appliance (e.g., television set or VCR) to be used in conjuncton with a cable television system providing unscrambled channels and scrambled premium channels. A broadband cable signal containing a plurality of television signal channels having different frequencies is passed through a filter to produce a modified cable signal having one of the signal channels removed therefrom. The broadband cable signal is input to a tuner for selectively tuning only to scrambled signal channels contained in the broadband cable signal. The tuner is tuned to a scrambled signal channel to be viewed by stepping through the scrambled signal channels accessible by the tuner until the desired signal channel is reached. A scrambled signal tuned by the tuner is descrambled and remodulated to convert it to the frequency of the signal channel removed by the filter in producing the modified cable signal. The re-modulated descrambled signal is combined with the modified cable signal to form a composite signal for input to a video appliance. The composite signal contains all of the original unscrambled channels together with the selected premium channel which has been descrambled.

摘要翻译： 有线电视频道选择器/解扰器使得电缆就绪视频设备（例如，电视机或VCR）的全部功能能够与提供未加扰频道和加扰频道的有线电视系统结合使用。 包含具有不同频率的多个电视信号信道的宽带电缆信号通过滤波器以产生具有从其中移除信号信道之一的经修改的电缆信号。 宽带电缆信号被输入到调谐器，用于仅选择性地调谐到包含在宽带电缆信号中的加扰信号信道。 将调谐器调谐到加扰信号通道，以通过步进通过调谐器可访问的加扰信号通道来观看，直到达到期望的信号通道。 由调谐器调谐的加扰信号被解扰并重新调制以将其转换为由滤波器去除的信号通道的频率，以产生经修改的电缆信号。 重新调制的解扰信号与经修改的电缆信号组合以形成用于输入到视频设备的复合信号。 复合信号包含所有原始的未加扰信道以及已被解扰的所选优质信道。

公开(公告)号：EP0266605A3

公开(公告)日：1989-08-16

申请号：EP87115198.1

申请日：1987-10-17

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Martin, Thomas F. ,  Fullingim, John P.

IPC分类号： H04N7/16

CPC分类号： H04N7/16

摘要： A cable television channel selector/descrambler enables the full capabilities of a cable-ready video appliance (e.g., television set or VCR) to be used in conjuncton with a cable television system providing unscrambled channels and scrambled premium channels. A broadband cable signal containing a plurality of television signal channels having different frequencies is passed through a filter to produce a modified cable signal having one of the signal channels removed therefrom. The broadband cable signal is input to a tuner for selectively tuning only to scrambled signal channels contained in the broadband cable signal. The tuner is tuned to a scrambled signal channel to be viewed by stepping through the scrambled signal channels accessible by the tuner until the desired signal channel is reached. A scrambled signal tuned by the tuner is descrambled and remodulated to convert it to the frequency of the signal channel removed by the filter in producing the modified cable signal. The re-modulated descrambled signal is combined with the modified cable signal to form a composite signal for input to a video appliance. The composite signal contains all of the original unscrambled channels together with the selected premium channel which has been descrambled.

公开(公告)号：EP0266605B1

公开(公告)日：1996-11-20

申请号：EP87115198.1

申请日：1987-10-17

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Martin, Thomas F. ,  Fullingim, John P.

IPC分类号： H04N7/16

CPC分类号： H04N7/16

摘要： A cable television channel selector/descrambler enables the full capabilities of a cable-ready video appliance (e.g., television set or VCR) to be used in conjuncton with a cable television system providing unscrambled channels and scrambled premium channels. A broadband cable signal containing a plurality of television signal channels having different frequencies is passed through a filter to produce a modified cable signal having one of the signal channels removed therefrom. The broadband cable signal is input to a tuner for selectively tuning only to scrambled signal channels contained in the broadband cable signal. The tuner is tuned to a scrambled signal channel to be viewed by stepping through the scrambled signal channels accessible by the tuner until the desired signal channel is reached. A scrambled signal tuned by the tuner is descrambled and remodulated to convert it to the frequency of the signal channel removed by the filter in producing the modified cable signal. The re-modulated descrambled signal is combined with the modified cable signal to form a composite signal for input to a video appliance. The composite signal contains all of the original unscrambled channels together with the selected premium channel which has been descrambled.