公开(公告)号：WO1989002204A1

公开(公告)日：1989-03-09

申请号：PCT/US1988002728

申请日：1988-08-18

Applicant: SCIENTIFIC ATLANTA, INC.

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

IPC: H04N07/00

CPC classification number: H04N11/006 ,  H04N7/083

Abstract: A method for enabling an increase in the vertical definition of a transmitted television signal while preserving its bandwidth including the steps of decimating alternate lines of the television signal and reinterpolating untransmitted alternate lines upon reception. The decimation is accomplished by diagonally filtering the televison signal in two dimensions to form a figure of five sample structure. Every other line is then added to the line adjacent to it so that half the lines are available for transmission, each line comprising folded-in high frequency information about missing line samples. Prior to transmission, bandwidth is conserved by filtering the signal to be transmitted at a skew-symmetric low pass filter. Apparatus for encoding and decoding the television signal each includes a two dimensional diagonal filter and line switching and control circuitry. The storage of a full field of sample data is not required for processing in accordance with the present method. Consequently the present apparatus comprises only line store means associated with the line switching and control circuitry of encoding apparatus.

Abstract translation: 一种能够增加发送的电视信号的垂直清晰度同时保持其带宽的方法，包括抽取电视信号的交替行并在接收时重新插入未发送的交替行的步骤。 抽取通过二维对角线过滤电视信号来形成五个样本结构的图形。 然后将每隔一行添加到与其相邻的行中，使得一半的行可用于传输，每行包括关于缺失行样本的折叠高频信息。 在传输之前，通过对在偏斜对称低通滤波器上传输的信号进行滤波来节省带宽。 用于编码和解码电视信号的装置每个都包括二维对角线滤波器和线路切换和控制电路。 根据本方法的处理，不需要存储全场样本数据。 因此，本装置仅包括与编码装置的线路切换和控制电路相关联的线路存储装置。

公开(公告)号：WO1986005340A1

公开(公告)日：1986-09-12

申请号：PCT/US1986000363

申请日：1986-02-21

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  LUCAS, Keith

IPC: H04B07/12

CPC classification number: H03M13/00 ,  G11B20/1876

Abstract: The system transmits blocks of N signal values preceded by block code words which are used at the receiver (200) to detect errors. In the transmitter (100), the digital value of the intelligence signal being transmitted is sent to a predictor (130), a comparator (150), and an N-word delay line (140). The predictor (130) estimates the next signal value, which is suitably delayed so that the current value and its estimate may be compared. The comparator (150) subtracts each estimated value from the corresponding actual value, temporarily storing the difference, called a ''delta value'', while the entire block of N words is processed. A ''Maximum Delta Encoder'' (160) encodes (with appropriate error correction) the absolute value of the maximum delta value for all N words. The resulting block code word is multiplexed into the data channel ahead of the group of N words to which it corresponds. An ''N Sample Delay'' is used to delay the N words so that the block code word will precede it. In the receiver (200), the block code word is demultiplexed and error corrected to recover the absolute value of the maximum delta value for the group of N words which follow. As each of the N words is received, it is subtracted from a predicted value generated by a predictor circuit (230) identical to the one found in the transmitter (100). If the difference is greater than the maximum delta value for that block, the received signal value represents an error. The error is then concealed by replacing it with the predicted value itself. If the difference is less than or equal to the maximum delta value, the received signal is accepted as correct.

公开(公告)号：WO1993010638A1

公开(公告)日：1993-05-27

申请号：PCT/US1992009571

申请日：1992-11-06

Applicant: SCIENTIFIC-ATLANTA, INC.

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

IPC: H04N07/167

CPC classification number: G06T9/008 ,  H04N7/20 ,  H04N19/94

Abstract: A vector quantization method employs mirrored input vectors to increase the reproduction quality of transmitted vector quantized data. A codevector (131) is selected from a vector quantization codebook for each possible orientation of an input vector. The codevector having the smallest distortion (142) relative to the input vector is selected for transmission (148). An identification code identifying the selected orientation is also transmitted (148).

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：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：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：WO1988001463A1

公开(公告)日：1988-02-25

申请号：PCT/US1987001983

申请日：1987-08-14

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  SETH-SMITH, Nigel ,  BATES, Cameron ,  LIM, Samson ,  VAN RASSEL, William ,  YONEDA, Robert ,  LUCAS, Keith

IPC: H04N07/04

CPC classification number: H04N7/0888 ,  G06Q50/06 ,  H04N7/03 ,  H04N7/083 ,  H04N7/1675 ,  H04N21/2347 ,  H04N21/26606 ,  H04N21/42684 ,  H04N21/4405 ,  H04N21/4882

Abstract: A communication system enabling transmission of individual subscriber teletext messages (12), audio and video to individual subscribers (300a, 300b, 300c) and permitting group communications of audio, video, teletext and data information from a single central subscriber location (302), such as a corporate head office to a plurality of satellite offices, such as field or sales offices of the corporation. A composite signal including the information to be transmitted as well as system wide, individual decoder and group decoder control signals is transmitted. The system-wide control signals include data germane to operation of each of the decoders (24) of this system, including key information needed to decode the composite signal.

Abstract translation: 一种通信系统，其能够将各个用户图文消息（12），音频和视频传输到各个用户（300a，300b，300c），并且允许来自单个中央用户位置（302）的音频，视频，图文电视和数据信息的组通信， 例如公司总部到多个卫星办公室，如公司的现场或销售办事处。 发送包括要发送的信息以及系统范围的单独解码器和组解码器控制信号的复合信号。 系统范围的控制信号包括与该系统的每个解码器（24）的操作密切相关的数据，包括解码复合信号所需的密钥信息。

公开(公告)号：WO1986001962A1

公开(公告)日：1986-03-27

申请号：PCT/US1985001721

申请日：1985-09-10

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： SCIENTIFIC ATLANTA, INC. ,  LUCAS, Keith

IPC: H04N07/16

CPC classification number: H04N21/2543 ,  H04N7/0888 ,  H04N7/163

Abstract: An information display scheme for displaying subscriber unique information to subscribers of a subscription communications system. The system comprises template page receiving means coupled to the communications system for receiving a template page as a format for the subscriber unique information, storage means coupled to the template page receiving means for storing the template page and logic means coupled to the communications system and to the storage means for locally generating and maintaining at least some of the subscriber unique information. The logic means combines the subscriber unique information with the template page for display to the subscriber.

公开(公告)号：EP0571362A1

公开(公告)日：1993-12-01

申请号：EP90901153.0

申请日：1989-11-16

Applicant: SCIENTIFIC-ATLANTA, INC.

Inventor： LUCAS, Keith

IPC: H04N7 ,  H04N11

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

Abstract: Un appareil servant à coder un signal de télévision à composants analogiques multiplexés haute définition en décimant des échantillons prédéterminés pour la transmission comprend des trajets de traitement séparés (Fig. 17 et 18), correspondant aux signaux à composants de luminance et de chrominance, respectivement. Les signaux à composants de luminance et de chrominance traités séparément sont multiplexés pour produire un signal composite à transmettre via une section de filtrage à symétrie gauche (1710) commune aux deux trajets de traitement. A une section de filtrage à symétrie gauche (1901) complémentaire à la section de filtrage de l'appareil à coder correspond un décodeur couplé à un poste récepteur de télévison haute définition. Des échantillons prédéterminés sont filtrés diagonalement et des informations à définition horizontale sont ajoutées au signal. La définition verticale est améliorée par conversion de balayage au niveau du récepteur.

公开(公告)号：EP0438506A1

公开(公告)日：1991-07-31

申请号：EP89912040.0

申请日：1989-10-10

Applicant: SCIENTIFIC ATLANTA, INC.

Inventor： LUCAS, Keith

IPC: H04N11 ,  H04N7

CPC classification number: H04N7/083 ,  H04N7/015 ,  H04N11/006

Abstract: Un procédé de codage d'un signal de télévision à haute définition compatible avec le format de signaux composites B-MAC comprend les étapes consistant à échantillonner orthogonalement le signal de haute définition, à filtrer diagonalement des informations de résolution diagonale, à décimer des échantillons alternés de lignes alternées et à replier à haute fréquence des informations de résolution horizontale au moyen d'un filtre passe-bas symétrique gauche. L'appareil de codage comprend l'application de filtres séparables numériques horizontaux et verticaux pour le filtre diagonal, le filtre vertical étant moins complexe que le filtre horizontal. En outre, il suffit d'une mémoire de lignes soit au niveau d'un codeur soit au niveau d'un décodeur. Au niveau d'un récepteur, on peut prévoir et appliquer une mémoire de champs et des techniques de doublage de lignes brevetées, afin d'obtenir une amélioration de la résolution verticale.