公开(公告)号：EP0518129A3

公开(公告)日：1993-05-19

申请号：EP92108925.6

申请日：1992-05-27

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Westerfer, Richard ,  Robbins, Clyde ,  Radice, Anthony M.

IPC分类号： H04N7/167

CPC分类号： H04N7/1693

摘要： The scrambling security of a sync suppressed television signal is enhanced by eliminating the fixed time relationship between the normal color burst component and synchronization information in successive lines of the television signal. Transmission of a first plurality of television lines is delayed to achieve a cumulative delay corresponding at least to the duration of a color burst component of the television signal. The transmission of a second plurality of television lines is subsequently accelerated to reduce the cumulative delay. By repeating the delaying and accelerating steps, the location of the color burst component is varied within the television signal over time. Derivation of a substitute horizontal synchronization pulse from the color burst component is thereby prevented.

公开(公告)号：EP0518129B1

公开(公告)日：1997-01-15

申请号：EP92108925.6

申请日：1992-05-27

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Westerfer, Richard ,  Robbins, Clyde ,  Radice, Anthony M.

IPC分类号： H04N7/167

CPC分类号： H04N7/1693

公开(公告)号：EP0372499B1

公开(公告)日：1995-11-02

申请号：EP89122425.5

申请日：1989-12-05

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Robbins, Clyde

IPC分类号： H04H1/00

CPC分类号： H04H20/65 ,  H04H20/95 ,  H04H60/14

公开(公告)号：EP0518129A2

公开(公告)日：1992-12-16

申请号：EP92108925.6

申请日：1992-05-27

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Westerfer, Richard ,  Robbins, Clyde ,  Radice, Anthony M.

IPC分类号： H04N7/167

CPC分类号： H04N7/1693

摘要： The scrambling security of a sync suppressed television signal is enhanced by eliminating the fixed time relationship between the normal color burst component and synchronization information in successive lines of the television signal. Transmission of a first plurality of television lines is delayed to achieve a cumulative delay corresponding at least to the duration of a color burst component of the television signal. The transmission of a second plurality of television lines is subsequently accelerated to reduce the cumulative delay. By repeating the delaying and accelerating steps, the location of the color burst component is varied within the television signal over time. Derivation of a substitute horizontal synchronization pulse from the color burst component is thereby prevented.

摘要翻译： 通过消除电视信号的连续行中正常色同步分量和同步信息之间的固定时间关系，增强同步抑制电视信号的加扰安全性。 第一多个电视线路的传输被延迟以实现至少对应于电视信号的色同步分量的持续时间的累积延迟。 随后加速第二多个电视线路的传输以减少累积延迟。 通过重复延迟和加速步骤，颜色突发分量的位置随时间在电视信号内变化。 由此防止了来自色同步分量的替代水平同步脉冲的推导。

公开(公告)号：EP0372499A2

公开(公告)日：1990-06-13

申请号：EP89122425.5

申请日：1989-12-05

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Robbins, Clyde

IPC分类号： H04H1/00

CPC分类号： H04H20/65 ,  H04H20/95 ,  H04H60/14

摘要： Method and apparatus are provided for transmitting, receiving, and reproducing digital audio signals as discrete carriers similar to standard FM broadcast signals. An audio signal is digitized using, for example, adaptive delta modulation techniques. Several channels of audio information, such as left and right stereo channels and a second audio program ("SAP") channel can all be digitized and incorporated onto the digital broadcast signal carrier. The digitized audio signal may be modulated using multiphase modulation of the carrier of an FM broadcast band signal. A plurality of audio channels may be digitized and transmitted over the airwaves, or over a cable transmission network. Channels of nondigitized audio channels may be interspersed with the digitized audio channels. Source material for the digitized audio channels may be provided to a cable headend over the cable transmission network outside the FM band, and rebroadcast over the cable transmission network in the FM band. Advantageously, an "extended" FM band between 72-120 MHz is employed to provide more channels than the "standard" FM band of 88-108 MHz.

摘要翻译： 提供了用于发送，接收和再现数字音频信号作为类似于标准FM广播信号的离散载波的方法和装置。 使用例如自适应增量调制技术将音频信号数字化。 诸如左立体声声道和右立体声声道以及第二音频节目（“SAP”）频道之类的多个音频信息通道都可以被数字化并并入到数字广播信号载体上。 可以使用FM广播频带信号的载波的多相位调制对数字化的音频信号进行调制。 多个音频信道可以被数字化并通过无线电波或者在有线传输网络上传输。 非特征化音频通道的通道可以散布有数字化的音频通道。 用于数字化音频信道的源材料可以被提供给在FM频带之外的有线传输网络上的电缆头端，并且通过FM频带中的电缆传输网络进行重播。 有利地，使用72-120MHz之间的“扩展”FM频带提供比88-108MHz的“标准”FM频带更多的信道。

公开(公告)号：EP0372499B2

公开(公告)日：2001-05-23

申请号：EP89122425.5

申请日：1989-12-05

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Robbins, Clyde

IPC分类号： H04H1/00

CPC分类号： H04H20/65 ,  H04H20/95 ,  H04H60/14

公开(公告)号：EP0372499A3

公开(公告)日：1991-09-11

申请号：EP89122425.5

申请日：1989-12-05

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Robbins, Clyde

IPC分类号： H04H1/00

CPC分类号： H04H20/65 ,  H04H20/95 ,  H04H60/14

摘要： Method and apparatus are provided for transmitting, receiving, and reproducing digital audio signals as discrete carriers similar to standard FM broadcast signals. An audio signal is digitized using, for example, adaptive delta modulation techniques. Several channels of audio information, such as left and right stereo channels and a second audio program ("SAP") channel can all be digitized and incorporated onto the digital broadcast signal carrier. The digitized audio signal may be modulated using multiphase modulation of the carrier of an FM broadcast band signal. A plurality of audio channels may be digitized and transmitted over the airwaves, or over a cable transmission network. Channels of nondigitized audio channels may be interspersed with the digitized audio channels. Source material for the digitized audio channels may be provided to a cable headend over the cable transmission network outside the FM band, and rebroadcast over the cable transmission network in the FM band. Advantageously, an "extended" FM band between 72-120 MHz is employed to provide more channels than the "standard" FM band of 88-108 MHz.