公开(公告)号：WO1997002671A3

公开(公告)日：1997-01-23

申请号：PCT/US1996011198

申请日：1996-06-28

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  BORAZJANI, Ramin

IPC: H04H01/02

公开(公告)号：WO1986007224A1

公开(公告)日：1986-12-04

申请号：PCT/US1986000801

申请日：1986-04-21

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  LUCAS, Keith

IPC: H04N07/167

CPC classification number: H04L9/0822 ,  H04L9/0891 ,  H04L9/14 ,  H04N7/1675 ,  H04N21/2347 ,  H04N21/26606 ,  H04N21/4405

Abstract: A method and apparatus for descrambling a television signal using a three tier encryption technique for the code used to descramble the signal. At the transmitter, a distribution key (41) is used to encrypt a session key. The encrypted session key (40.1) is transmitted in the digital data channel (40) of the television signal. The session key is also used to encrypt the descramble code (40.2) which is also transmitted in the data channel (40) of the television signal. At the receiver (42) the encrypted session key (43) is decrypted using a distribution key (41). The decrypted session key (43), is in turn used to decrypt the descramble code (44). The descramble code may then be used to descramble and/or decrypt other signals (45, 46, 47) in the receiver.

Abstract translation: 一种使用三层加密技术对用于对信号进行解扰的代码对电视信号进行解扰的方法和装置。 在发射机处，分配密钥（41）用于加密会话密钥。 加密会话密钥（40.1）在电视信号的数字数据信道（40）中发送。 会话密钥还用于加密也在电视信号的数据信道（40）中发送的解扰码（40.2）。 在接收机（42）处，使用分配密钥（41）解密加密会话密钥（43）。 解密的会话密钥（43）又用于解密解密码（44）。 然后可以使用解扰码解扰和/或解密接收机中的其他信号（45,46,47）。

公开(公告)号：WO1986003919A1

公开(公告)日：1986-07-03

申请号：PCT/US1985002092

申请日：1985-10-25

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  MOBLEY, Joseph, G., II.

IPC: H04N05/44

CPC classification number: H04N9/646 ,  H04N7/045 ,  H04N11/08 ,  H04N11/146

Abstract: In a FM television signal angle modulated with luminance and chrominance information, there exists a high degree of correlation between picture elements occurring one line period apart. In an effort to steer the pass band of a tunable bandpass filter (320) to the instantaneous frequency of the incoming television signal, a steering signal (340) is developed which utilizes this high degree of correlation. For NTSC systems, (Figure 3), luminance information is delayed by one-line period (63.5 mu s in the U.S.A.) and combined with suitably delayed chrominance information to form the filter's steering signal. For MAC systems (Figure 4), one-line delayed luminance and two-line delayed chrominance information are alternately applied to the filter as its steering signal. By steering the pass band of the filter to the incoming signal, maximum signal will be captured with minimum noise, enhancing the signal-to-noise ratio of a color television system.

Abstract translation: 在利用亮度和色度信息调制的FM电视信号角度中，在相隔一行的像素之间存在高度的相关性。 为了将可调谐带通滤波器（320）的通带引导到输入电视信号的瞬时频率，开发了利用这种高度相关性的转向信号（340）。 对于NTSC系统，（图3），亮度信息被延迟一行周期（美国63.5μs），并且与适当延迟的色度信息相结合以形成滤波器的转向信号。 对于MAC系统（图4），将一行延迟亮度和双线延迟色度信息交替地施加到滤波器作为其转向信号。 通过将滤波器的通带转换为输入信号，将以最小噪声捕获最大信号，从而提高彩色电视系统的信噪比。

公开(公告)号：WO1993005591A1

公开(公告)日：1993-03-18

申请号：PCT/US1992007326

申请日：1992-09-03

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  LITTLE, Frank, R. ,  MEGNA, John, G. ,  RAND, Heather, H. ,  ZENDT, Frederick, T.

IPC: H04B10/14

CPC classification number: H03G3/3084 ,  H04B10/0775 ,  H04B10/2931 ,  H04B10/5053 ,  H04B10/674 ,  H04B10/697

Abstract: A system for signal level control in AM fiber systems is provided. The system provides level controls at both transmitter and receiver ends of the fiber transmission system, utilizing compensation and control techniques at each end to maintain and optimize the performance of the system. The transmitter includes two stage level control based on a composite power level of a detected RF signal. The receiver includes two stage level control based on a pilot channel filtered from the channels transmitted to the receiver.

公开(公告)号：WO1991001620A2

公开(公告)日：1991-02-21

申请号：PCT/US1990002742

申请日：1990-05-24

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  COOK, James, H., Jr.

IPC: H01Q3/24 ,  H01Q21/29 ,  H01Q25/02

CPC classification number: H01Q25/02 ,  H01Q3/24 ,  H01Q21/29

Abstract: A multi-element antenna feed method and system which has superior side lobe characteristics over precious electronically scanned beam approaches is provided. A multi-element antenna feed system generally comprises a multi-element antenna, an antenna array processor, a receiver, a signal processor for automatic tracking of targets, and an antenna steering control mechanism. The multi-element antenna may comprise alternate configurations and the antenna array processor is coupled to the multi-element antenna. The antenna array processor particularly comprises a diode switching array for combining at least one output of the elements of the multi-element antenna with at least one other output of the multi-element antenna switchably selected via the diode switching array. The method allows control of the antenna system side lobes in both the scanned offset beam plane and the orthogonal plane by an amplitude weighted combination of the selected element beams. This results in an improved capability to reduce crosstalk between two orthogonal tracking channels, offset beam control versus frequency, and a wide frequency bandwidth.

公开(公告)号：WO1989010664A1

公开(公告)日：1989-11-02

申请号：PCT/US1989001726

申请日：1989-04-28

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  BANKER, Robert, O. ,  SCHAUBS, Randolph, J. ,  HARNEY, Michael ,  McMULLAN, Jay, C., Jr. ,  WASILEWSKI, Anthony, J. ,  DURDEN, Gregory, S. ,  HAMAN, Ray, T., Jr. ,  NADDOR, David ,  THATCHER, William, B, Jr.

IPC: H04K01/00

CPC classification number: H04N7/1675

Abstract: The present invention discloses a method and apparatus for providing a cable TV system with the ability to issue information from a system manager (102), determine whether the information is intended for a set top designed to receive out-of-band information or in-band information, send the information to the appropriate circuitry. Reformatting of some information is necessary and is performed by a format translator (701). For in-band information, information may be sent over one or more of a plurality of data streams. Certain types of information are sent over one or more data streams based on the type of information and characteristics of the data streams. It is further disclosed that for efficiency, similar information intended for several addresses is grouped together in a database (702) manager so that the information may be sent to plural addresses at one time. Scramblers (104, 209) are employed with the capability of inserting data onto nonscrambled channels.

Abstract translation: 本发明公开了一种用于向有线电视系统提供从系统管理器（102）发出信息的能力的方法和装置，确定信息是否针对被设计为接收带外信息的集合， 将信息发送到适当的电路。 重新格式化某些信息是必要的，并且由格式转换器执行（701）。 对于带内信息，可以通过多个数据流中的一个或多个来发送信息。 基于信息的类型和数据流的特性，通过一个或多个数据流发送某些类型的信息。 进一步公开的是，为了效率，用于多个地址的类似信息被分组在数据库（702）管理器中，使得可以一次将信息发送到多个地址。 加扰器（104,209）具有将数据插入非加扰通道的能力。

公开(公告)号：WO1986007226A1

公开(公告)日：1986-12-04

申请号：PCT/US1986000825

申请日：1986-04-17

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  LOWRY, John, D. ,  LUCAS, Keith

IPC: H04N07/167

CPC classification number: H04N7/1696

Abstract: A method and apparatus for creating a television signal and encrypting or decrypting the signal at the same time. Luminance and chrominance information are received by the apparatus and stored in separate television scan line stores (38a, 38b). The stored luminance and chrominance information is read out from their respective stores at a frequency corresponding to a desired format or standard to create the television signal. The signal may be simultaneously encrypted or decrypted by delaying the time at which the luminance and/or chrominance information is read out in accordance with an encryption or decryption key.

Abstract translation: 一种用于创建电视信号并且同时对信号进行加密或解密的方法和装置。 亮度和色度信息由设备接收并存储在单独的电视扫描线存储器（38a，38b）中。 存储的亮度和色度信息以对应于期望的格式或标准的频率从其各自的存储中读出，以产生电视信号。 可以通过延迟根据加密或解密密钥读出亮度和/或色度信息的时间来同时加密或解密该信号。

公开(公告)号：WO1989009528A1

公开(公告)日：1989-10-05

申请号：PCT/US1989001245

申请日：1989-03-30

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  DURDEN, Gregory, S. ,  HAMAN, Ray, T., Jr. ,  HAMILTON, Scott, L. ,  FREDERICK, Richard, B. ,  NADDOR, David, J. ,  SCHAUBS, Randolph, J.

IPC: H04N07/10

CPC classification number: G06Q20/145 ,  H04N7/165 ,  H04N7/17309 ,  H04N21/2543 ,  H04N21/47211 ,  H04N2007/1739

Abstract: In an impulse pay-per-view system, downloadable transactions effect increased control and diversity. A preview time/free time transaction permits a subscriber to view portions of a pay-per-view event without purchasing the event. A security transaction sent while each event is active prevents a subscriber from receiving events which have not been purchased. A telephone number transaction includes a special character representing an instruction to pause between dialing selected digits. A viewer statistic transaction instructs a subscriber to record the channel he is viewing. A subscriber may pre-buy events to facilitate event recording. System manager (8) complies and downloads transactions to IPPV modules (20) via addressable transmitter (10) and CATV network (12). Modules (20) control set-top terminals (15) to control viewing of events. Modules (20) also report event viewing data to system manager (8) via telephone network (24) and phone processor (18).

Abstract translation: 在一个按次付费观看系统中，可下载的交易会增加控制和多样性。 预览时间/空闲时间交易允许用户在不购买事件的情况下查看按次付费观看事件的部分。 每个事件处于活动状态时发送的安全事务阻止订户接收尚未购买的事件。 电话号码交易包括表示在拨号选择的数字之间暂停的指令的特殊字符。 观众统计交易指示用户记录他正在观看的频道。 用户可以预购事件以便事件记录。 系统管理器（8）通过可寻址发射机（10）和有线电视网络（12）对IPPV模块（20）进行协议和下载。 模块（20）控制机顶终端（15）以控制事件的观看。 模块（20）还通过电话网络（24）和电话处理器（18）向系统管理器（8）报告事件查看数据。

公开(公告)号：WO1989009527A1

公开(公告)日：1989-10-05

申请号：PCT/US1989001143

申请日：1989-03-20

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  RHODES, Charles, W.

IPC: H04N05/455

CPC classification number: H04N11/08 ,  H04N7/083

Abstract: In a Multiplexed Analog Component (MAC) color television transmission system in which the MAC signal is to be converted at the receiver to a composite color television signal having a 227.5 fH color subcarrier, frequency-generation equipment required at the receiver is simplified, and bandwidth is extended, by selecting the various frequencies in accordance with the following relationship: f0 = 3f1 = 3f2 = 2f4 = 1365k fH where f0 is the master clock frequency generated by a master clock (401), f1 is the luminance sampling frequency, and f2 is the chrominance sampling frequency generated by a frequency divider circuit (403); f4 is the MAC sampling frequency generated by a second frequency divider circuit (402), fH is the horizontal line frequency, and k is a positive integer greater than 2, f3 is the data clock frequency which is independent of k and remains fixed at its present value.

公开(公告)号：WO1986007225A1

公开(公告)日：1986-12-04

申请号：PCT/US1986000824

申请日：1986-04-21

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  VAN RASSEL, William, F.

IPC: H04N07/167

CPC classification number: H04L9/0822 ,  H04L9/0891 ,  H04N7/167 ,  H04N7/1675 ,  H04N7/56

Abstract: A secure communications system requires special arrangements for the establishment and maintenance of framing and synchronization. A framing word is transmitted (line 2) at a fixed frequency, and a key necessary to unscramble the transmission is transmitted (line 3) in a fixed position in relation to the framing word. Synchronization information (reference clock bursts) is scrambled with the intelligence and may only be recovered once the key is available. When framing is being maintained, the receiver's phase-locked loop (107) opens only during the short reference clock bursts in the incoming signal, and the framing signal generator (105) is able to predict the occurrence of successive framing signals without reference to the incoming signal. When framing is lost, the receiver enters a ''soft lock'' condition in which its phase-locked loop is opened to receive the entire incoming signal and in which the framing signal generator (105) refers solely to the incoming signal to generate framing signals.