公开(公告)号：WO1993010631A1

公开(公告)日：1993-05-27

申请号：PCT/US1992009995

申请日：1992-11-17

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  ISRAELSEN, Paul, D. ,  LUCAS, Keith

IPC: H04N07/10

CPC classification number: H04N21/2383 ,  G06T9/008 ,  H04N7/10 ,  H04N19/94 ,  H04N21/4382

Abstract: A method of communicating data from a first location (112) to a second location (e.g. 114 or 116) employing a vector quantization data compression technique that allows users to select the reproduction quality of the transmitted vector quantized data. According to the method, data is encoded (120) (compressed) from the last level of a first tree search vector quantization codebook at the first location (112). A second tree search vector quantization codebook is provided (126a, 126b) at the second location (114, 116) having a number of levels equal to or less than the number of levels in the first codebook. Vector quantized data received at the second location (114, 116) is truncated, if necessary, for use with the second codebook. The reproduction quality of the transmitted vector quantized data is a function of the number of levels in the second codebook.

公开(公告)号：WO1992022987A1

公开(公告)日：1992-12-23

申请号：PCT/US1992004936

申请日：1992-06-12

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  RAISER, James, E. ,  BAGLEY, Julius, B. ,  HAYASHI, Michael, T. ,  HARNEY, Michael, P. ,  FARMER, James, O. ,  BACON, Kinney, C. ,  COOK, Alex, M., Jr.

IPC: H04N07/167

CPC classification number: H04N7/1713

Abstract: A television system having sync suppression scrambling and descrambling which includes in band and out of band signaling methods. The in band signaling method modulates the IF sound carrier of a premium video channel with timing and data pulses (Figs. 2A, 2B) while the out of band signaling method modulates the previously modulated IF sound on a separate carrier onto a separate out of band data carrier (Figs. 3A, 3B). The in band signaling method uses a descrambler which tunes a channel before demodulating the timing and data pulses from the sound carrier while the out of band signaling method tunes a selected data carrier to demodulate the timing and data pulses. In both methods, the timing pulses are used to restore the levels of the synchronization pulses in the sync suppressed video signal, and thus descramble the signal, while the data pulses are used for addressable messaging to the descrambler including authorization. The out of band descrambler provides broadband sync restoration for a particular channel and thus does not need a broadband tuner for the video signal.

Abstract translation: 具有同步抑制加扰和解扰的电视系统，其包括频带和带外信令方法。 带内信令方法利用定时和数据脉冲调制优质视频信道的IF声音载波（图2A，2B），而带​​外信令方法将单独载波上的先前调制的IF声音调制到单独的带外 数据载体（图3A，3B）。 带内信令方法使用解扰器，其在解调来自声载波的定时和数据脉冲之前调谐信道，而带外信令方法调谐所选择的数据载波以解调定时和数据脉冲。 在两种方法中，定时脉冲用于恢复同步抑制的视频信号中的同步脉冲的电平，并且因此解扰信号，同时数据脉冲用于包括授权的解扰器的可寻址消息传送。 带外解扰器为特定信道提供宽带同步恢复，因此不需要用于视频信号的宽带调谐器。

公开(公告)号：WO1991015063A1

公开(公告)日：1991-10-03

申请号：PCT/US1991001829

申请日：1991-03-20

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  BEYERS, Robert, John, II ,  BRAMHALL, Charles, Robert ,  DURDEN, Gregory, Steven ,  EDWARDS, Robert, Jay ,  HAMAN, Ray, Thomas, Jr. ,  HODER, Douglas, John ,  HUNTLEY, Donald, Randolph ,  KENNEDY, John, Anson ,  McGINTY, Emory, L., Jr. ,  McMULLAN, Jay, Cauthern, Jr. ,  NADDOR, David, Jonathan ,  SCHAUBS, Randolph, James ,  STILL, Jesse, Monroe ,  WASILEWSKI, Anthony, John ,  WEST, Lamar, Edwin, Jr. ,  WHITE, Donovan, Steve

IPC: H04B17/00

CPC classification number: H04N21/44222 ,  H04L5/06 ,  H04L27/2035 ,  H04L27/2276 ,  H04N7/10 ,  H04N7/17309 ,  H04N21/25891

Abstract: Automatic level calibration apparatus for transmitting data from a cable television terminal to the headend of a cable television system comprises programmable transmitter apparatus of the terminal, programmable receiving apparatus at the headend and a calibration controller. Responsive to an addressed command from the headend, the programmable transmitter apparatus returns a sequence of levels at a particular calibration frequency. The programmable receiver apparatus determines an indication of the received signal strength of each of the levels of the sequence of levels. The controller determines an optimum level for transmissions from the terminal.

公开(公告)号：WO1991014313A1

公开(公告)日：1991-09-19

申请号：PCT/US1991001570

申请日：1991-03-07

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  TRAWICK, Charles, D. ,  CALDWELL, Owen, M.

IPC: H04B03/46

CPC classification number: G01S7/4004 ,  G01S7/4021 ,  G01S2007/4073

Abstract: Improved autoranging, calibration, and a complex signal detection circuits for an intermediate frequency (IF) stage in a radio frequency (RF) measurement receiver (8). An improved autoranging circuit (75) sets a gain stage of a selectively variable gain amplifier (72) prior to each data acquisition cycle, to provide for wide-dynamic range and rapid time domain response. An improved complex signal detection circuit (80) for generating an inphase (i) and quadrature phase (Q) signal from an input IF signal in a signal channel (38a) and a reference channel (38b) is constructed with a novel commutating demodulator circuit (12a, 12b). Calibration is effected with an improved digital phase reference method and apparatus wherein effective 90° phase shifts are digitally generated by shifting the generation sequence of timing signals for the complex signal detection circuit (80) instead of phase shifting a known calibration signal, obviating the need for precision phase shifters, Doppler frequency generators, or Fourier transforms to obtain correction components for the optimum detection of complex signals.

公开(公告)号：WO1991008580A1

公开(公告)日：1991-06-13

申请号：PCT/US1990007044

申请日：1990-12-03

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  KRUSE, Herman

IPC: H01J40/14

CPC classification number: H04B10/6973 ,  H03F3/082 ,  H04B10/69

Abstract: A transimpedance receiver for broad band optical signals, such as carry multichannel CATV signals or broad band data over an optical fiber (14) which may vary in length (e.g. from 2 km to 20 km) such that the optical power at a photodetector (18) of the receiver (16) may vary widely depending upon where the receiver (16) is installed in the fiber optic distribution system utilizes a broad band device, preferably a GASFET (26), the internal capacitance and gain of which enables amplification over the broad band frequency range without oscillation. The output voltage is coupled to an electrical transmission line which may be a low impedance coaxial line using a buffer amplifier (46) incorporating a device of the same type as used in the transimpedance amplifier (26) which has connected thereto networks for controlling the spectral response of the receiver (16) so that it remains essentially flat over the broad band frequency range.

公开(公告)号：WO1990013980A1

公开(公告)日：1990-11-15

申请号：PCT/US1990002246

申请日：1990-04-27

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  LUCAS, Keith

IPC: H04N11/20

CPC classification number: H04N7/0152 ,  H04N7/0125 ,  H04N11/006 ,  H04N11/08 ,  H04N11/20 ,  H04N19/186 ,  H04N19/59

Abstract: A high definition B-MAC television signal transmission system comprises a scan converter and a signal pre-processor for accepting signals in various high definition formats. In particular, an 1125 line or 1050 line to 525 line scan converter is required due to the preponderance of at least 1125 line and to some extent 1050 line 60 Hertz field rate format high definition television studio equipment. The scan converter includes circuitry for converting from horizontal to vertical scan format via first and second field stores. A phase shift transversal filter spatially shifts every sample of each field by 1/4 line. In alternate fields, the direction of spatial shifting reverses. For an interlace output, alternate line samples are discarded or for a sequential scan output, all samples are used. The output of the transversal filter is scan converted to reassume a horizontal scan format. Three field stores are used to buffer the input and output field rates such that one field of samples is dropped every one thousand fields in order to convert from a 60 Hz field rate to 59.94 Hz. At the same time, the coefficients of the transversal filter are reversed for the next field of samples after the dropped field. The scan converter provides a digital 525 line 1:2 or, in another embodiment with two field rate converter circuits, a 1:1 format output. According to B-MAC signal processing, an interlace 525 line output is provided to a pre-processor which additionally may accept a 525 line analog RGB input. Also, the pre-processor may generate its own test pattern signals.

Abstract translation: 高分辨率B-MAC电视信号传输系统包括扫描转换器和用于接收各种高清晰度格式的信号的信号预处理器。 特别是需要1125线或1050线至525线扫描转换器，因为至少有1125线，在某种程度上是1050线60赫兹现场速率格式的高分辨率电视演播室设备。 扫描转换器包括经由第一和第二场存储从水平扫描格式转换成垂直扫描格式的电路。 相移横向滤波器将每个场的每个样本空间移位1/4行。 在替代领域，空间变化的方向反转。 对于交错输出，交替线样本被丢弃或者对于顺序扫描输出，使用所有样本。 横向滤波器的输出被扫描转换以重新产生水平扫描格式。 三个场存储器用于缓冲输入和输出场速率，使得每一个场中一个采样场被丢弃，以便从60Hz场速率转换为59.94Hz。 同时，对于下一个场的下一个采样场，横向滤波器的系数反转。 扫描转换器提供数字525线1：2，或者在另一个实施例中提供两个场速率转换器电路，1：1格式输出。 根据B-MAC信号处理，将交错525行输出提供给另外可以接受525行模拟RGB输入的预处理器。 此外，预处理器可以产生其自己的测试图案信号。

公开(公告)号：WO1990013100A1

公开(公告)日：1990-11-01

申请号：PCT/US1990002031

申请日：1990-04-19

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  KUBAN, Curt, M. ,  TING, Jeffrey, C. ,  WILLIAMS, Fitzroy, E. ,  JOHNSON, Lee, R. ,  SMITH, Elizabeth, A. ,  MYERS, Howard, L.

IPC: G08B05/22

CPC classification number: H04N5/44543 ,  G06Q10/06 ,  G08B5/221 ,  H04N7/0888 ,  H04N7/165 ,  H04N7/1675 ,  H04N7/173 ,  H04N7/17309 ,  H04N7/17318 ,  H04N21/2143 ,  H04N21/478 ,  H04N21/482

Abstract: An interactive room status/time information system is provided having a terminal associated with a television comprising a processor for processing data, an associated memory for storing operation data and control algorithms, a keypad with remote control for inputting information, a character generator responsive to the processor for generating a multiple character, multiple line display, a power supply input, and a cable transmission link for communication at television frequencies with a system manager. A maid or inspector can send status information from a hotel/hospital room terminal over a cable television system to a system manager location. The status of a room for occupancy is determined by a two-step procedure. Input from both a maid and an inspector must be received before a room has a ready-for-occupancy status. Screens of compiled room status and historical data can be displayed at the system manager. Also, certain screens of room status data may be displayed on an associated television at the room terminal. Functions can be performed at the system manager location including searching stored status information for historical data of a particular room or maid. In accordance with a further time control feature of the present system, a hotel guest may actuate a wake-up mode of operation of a room terminal through a terminal keyboard or remote control. The system manager subsequently polls the terminal to determine if the room terminal is properly operating or if the wake-up alarm has been responded to. If not, hotel personnel may be dispatched to the room.

Abstract translation: 提供具有与电视机相关联的终端的交互式房间状态/时间信息系统，其包括用于处理数据的处理器，用于存储操作数据和控制算法的相关联存储器，具有用于输入信息的遥控器的键盘，响应于 处理器，用于产生多个字符，多行显示，电源输入和用于与系统管理器在电视频率通信的电缆传输链路。 女佣或检查员可以通过有线电视系统将酒店/医院室终端的状态信息发送到系统管理员位置。 入住房间的状态由两步程序决定。 必须在房间准备就绪状态之前收到女佣和检查员的输入。 编辑的房间状态和历史数据的屏幕可以显示在系统管理员处。 此外，房间状态数据的某些屏幕可以在房间终端的相关联的电视上显示。 可以在系统管理器位置执行功能，包括搜索存储的特定房间或女佣的历史数据的状态信息。 根据本系统的另外的时间控制特征，酒店客人可以通过终端键盘或遥控器来启动房间终端的唤醒操作模式。 系统管理员随后轮询终端以确定房间终端是否正常运行，或者是否响应了唤醒报警。 如果没有，酒店人员可能会被派往房间。

公开(公告)号：WO1990001852A1

公开(公告)日：1990-02-22

申请号：PCT/US1989003214

申请日：1989-07-28

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  LUCAS, Keith

IPC: H04N07/06

CPC classification number: H04N11/004

Abstract: A method for increasing the definition of an NTSC video signal using an augmentation channel involves the generation of both a line summation signal as well as a line difference signal. From the line summation signal, a horizontal detail signal may be derived which may be diagonally filtered and added to a diagonally filtered vertical detail signal and transmitted in a bandwidth of approximately 2.5 megahertz. Furthermore, the line summation signal may be applied for the derivation of a standard NTSC video signal which is transmitted separately from the augmentation channel. Decoder apparatus comprises a single digital diagonal filter having complementary output functions resulting in both improved horizontal and vertical resolution at low cost.

公开(公告)号：WO1989010663A1

公开(公告)日：1989-11-02

申请号：PCT/US1989001724

申请日：1989-04-28

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  PIDGEON, Rezin, E., Jr. ,  ZENDT, Frederick, T. ,  THOMPSON, Leo, J.

IPC: H04K01/00

CPC classification number: H04N7/17309 ,  H04B1/70712

Abstract: Apparatus for transmitting data spread across at least a portion of the bandwith of a cable television channel comprises a carrier signal oscillator (203), a frequency divider (205), a pseudorandom sequence generator (202) and two exclusive OR gates (207, 210). A first exclusive OR gate (207) serves to spread a data signal across the pseudorandom noise sequence generator (202) having a much higher chip rate than the bit rate of the data signal. The second exclusive OR gate (210) modulates the spread spectrum data signal to a carrier frequency for transmission over the cable television channel. The apparatus may be applied for return path transmission in the 0-30 megahertz band which is highly susceptible to interference noise and provides approximately a 20 dB signal to interference ratio advantage over known data coding and transmission schemes. A microprocessor (201) normally present in a cable television terminal may format data for transmission, control the spread spectrum modulation process and control gain control circuitry for introducing an appropriate power level into the cable plant.

公开(公告)号：WO1998027732A1

公开(公告)日：1998-06-25

申请号：PCT/US1997022991

申请日：1997-12-16

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： SCIENTIFIC-ATLANTA, INC. ,  AKINS, Glendon, L., III ,  BAKER, Robert, O.

IPC: H04N07/167

CPC classification number: H04L63/04 ,  H04L63/0442 ,  H04L63/045 ,  H04L63/062 ,  H04N7/162 ,  H04N7/1675 ,  H04N21/4524

Abstract: A technique for preventing replay attacks on digital information distributed by network services providers. At the beginning of a subscription period for a service, a network service provider sends entitlement messages to the subscriber which provide the subscriber for the service with a session key (110) and authorization information (214). The authorization information specifies a service (213) and a period of time (205). When an encrypted instance of a service is distributed on the network, it is accompanied by a series of entitlement control messages. Each of the messages includes a value which can be used with the session key to obtain a control word for decrypting the encrypted instance and a time specifier. The subscriber equipment which decrypts the instance of the service does so only if the time specifier in the entitlement control message specifies a time within the time period specified by the authorization information.

Abstract translation: 一种防止网络服务提供商分发的数字信息的重放攻击的技术。 在服务的订阅周期开始时，网络服务提供商向用户发送授权消息，为用户提供会话密钥（110）和授权信息（214）。 授权信息指定服务（213）和时间段（205）。 当服务的加密实例在网络上分发时，伴随着一系列授权控制消息。 每个消息包括可以与会话密钥一起使用以获得用于解密加密实例的控制字和时间说明符的值。 仅当授权控制消息中的时间说明符在授权信息指定的时间段内指定时间时，解密服务实例的用户设备才会这样做。