公开(公告)号：EP0539557A1

公开(公告)日：1993-05-05

申请号：EP92910243.0

申请日：1992-05-15

申请人： BRITISH BROADCASTING CORPORATION

发明人： Thomas, Graham Alexander

IPC分类号： G06T9 ,  H04N7

CPC分类号： H04N7/0155 ,  H04N19/30 ,  H04N19/39

摘要： Avant son émission, on traite un signal vidéo à sous-échantillonnage temporel provenant d'un codeur de réduction de largeur de bande afin de réduire les effets de flou d'image qui pourraient se produire si le signal codé était observé directement sur un récepteur non équipé d'un décodeur de réduction de largeur de bande. Une fraction 1/N des échantillons est émise dans le premier champ de chaque groupe de champs N, où N est le rapport de sous-échantillonnage temporel. Chacun des autres champs N-1 est formé en projetant le premier champ le long de la trajectoire de déplacement estimée jusqu'au moment approprié et en ajoutant à cette projection la différence entre un autre groupe d'échantillons N/1 et une estimation de ces échantillons dérivée des échantillons émis dans le premier champ. Dans le décodeur, les champs projetés et l'estimation des échantillons peuvent être dérivés des échantillons dans le premier champ émis du groupe pour chacun des champs ultérieurs. A l'aide de ces informations, on peut dériver les valeurs des autres séries d'échantillons à partir des champs émis ultérieurs, ce qui donne le signal d'origine sous-échantillonné temporellement. Ce signal est alors décodé par le décodeur de réduction de largeur de bande.

公开(公告)号：EP0535066A1

公开(公告)日：1993-04-07

申请号：EP91911329.0

申请日：1991-06-19

申请人： BRITISH BROADCASTING CORPORATION

发明人： BORER, Timothy, John

IPC分类号： H04N5

CPC分类号： H04N5/145

摘要： Afin de déterminer si n'importe lequel des vecteurs de mouvement inclus dans un menu de vecteurs de mouvement s'applique à n'importe quel pixel donné, des opérations d'affectation de marche en avant et en arrière (64, 66) sont effectuées. Chaque image courante est décalée (50) par chacun d'une multiplicité de vecteurs de mouvement et comparée (52) à l'image suivante afin de déterminer les erreurs d'affectation pour chaque pixel. L'image suivante est elle aussi décalée par chacun d'une multiplicité de vecteurs de mouvement inverse possibles et comparée à l'image courante afin de déterminer les erreurs d'affectation de chaque pixel. Les erreurs d'affectation sont combinées (62) et si l'une des erreurs d'affectation d'un pixel est importante, le pixel est signalé comme étant "sans correspondance".

公开(公告)号：EP0265476B1

公开(公告)日：1993-01-13

申请号：EP87902614.4

申请日：1987-04-16

申请人： BRITISH BROADCASTING CORPORATION

发明人： SANDBANK, Charles, Peter

IPC分类号： H04N5/782 ,  H04N7/087

CPC分类号： H04B1/205 ,  H04N5/765 ,  H04N5/782 ,  H04N7/088 ,  H04N7/0887

摘要： A conventional video recorder (20) comprises electromechanical components, electronic circuits and a control unit with which there are associated both front panel controls and a user remote control unit with a sensor to which signals can be sent from a hand-held remote control unit (24). In addition to these conventional features an off-air remote controller (30) is provided. This is capable of decoding control signals associated with the television signal and includes an encoder which generates outputs which match those from the conventional user remote control unit (24).

公开(公告)号：EP0511245A1

公开(公告)日：1992-11-04

申请号：EP91902088.0

申请日：1991-01-17

申请人： BRITISH BROADCASTING CORPORATION

发明人： CHILDS, Ian

IPC分类号： H04N7

CPC分类号： H04N7/015 ,  H04N7/0155 ,  H04N7/122

摘要： Afin d'atténuer les problèmes rencontrés avec la conversion optimisée de réglage de champ, une source de haute définition est convertie (160) avant compression de la largeur de bande (120, 122, 124, 125). La compression de largeur de bande s'effectue au moyen d'un certain nombre de procédés différents dont au moins l'un d'entre eux est appliqué au signal de source convertie. Le branchement ou le procédé de transmission de compression de largeur de bande est sélectionné en fonction d'un signal de commande réagissant au contenu de l'image. Préalablement à la transmission du signal converti à largeur de bande comprimée, ce signal est infléchi vers le réglage de champ de transmission et les échantillons redisposés selon une configuration en quinconce (en 132).

公开(公告)号：EP0453110A3

公开(公告)日：1992-08-19

申请号：EP91302723.1

申请日：1991-03-27

申请人： BRITISH BROADCASTING CORPORATION

发明人： Fletcher, William Harold ,  Wegerif, Simon Christopher ,  Travis, Christopher Julian

IPC分类号： H04L7/00 ,  H03K5/135 ,  G06F5/06

CPC分类号： G06F5/12 ,  G06F2205/123 ,  H03K5/135

摘要： A digital audio signal which is subject to sample-to-sample jitter is synchronised with local reference pulses (READ) by the use of a read-write buffer memory (12). Timing pulses at a terminal (80) are associated with the input samples. The input samples are applied through a one-sample latch store (36) to the main memory (12), and the timing pulses are applied by switches (66,68) either directly or after a short delay by a delay element (38) to the write control input of the main memory (12). A phase comparator (24) detects sample-by-sample when the write pulses are near to the read pulses and causes the switches (66,68) to change state in response thereto, and they retain their changed state until a danger of potential read-write contention is again detected when they revert to their original state.

公开(公告)号：EP0496477A2

公开(公告)日：1992-07-29

申请号：EP92200942.8

申请日：1987-04-16

申请人： BRITISH BROADCASTING CORPORATION

发明人： Sandbank, Charles Peter

IPC分类号： H04N5/782 ,  H04N7/087

CPC分类号： H04B1/205 ,  H04N5/765 ,  H04N5/782 ,  H04N7/088 ,  H04N7/0887

摘要： A video recorder comprises electromechanical components (10), electronic circuits (11) and a control unit (12) with which there are associated both front panel controls (13) and a user remote control receiving unit (16) with a sensor to which signals can be sent from a hand-held remote control unit. In addition to these conventional features an off-air controller (18) is provided. This is capable of decoding control signals associated with the television signal and includes an encoder which generates outputs which simulate those from the conventional hand-held remote control unit (16). The off-air controller (18) is preferably within the casing of the video recorder.

摘要翻译： 视频记录器包括机电部件（10），电子电路（11）和控制单元（12），其与前面板控制器（13）和用户遥控接收单元（16）相关联，传感器具有信号 可以从手持遥控器发送。 除了这些常规特征之外，还提供了空气控制器（18）。 这能够解码与电视信号相关联的控制信号，并且包括产生模拟来自传统手持遥控单元（16）的输出的编码器。 空中控制器（18）优选地在录像机的壳体内。

公开(公告)号：EP0263112B1

公开(公告)日：1992-06-03

申请号：EP87900234.3

申请日：1986-12-23

申请人： BRITISH BROADCASTING CORPORATION

发明人： THOMAS, Graham, A. ,  BORER, Timothy, John

IPC分类号： H04N7/12

CPC分类号： H04N11/167 ,  G06T7/262 ,  H04N5/145 ,  H04N7/0155 ,  H04N7/0157 ,  H04N7/125 ,  H04N9/646 ,  H04N11/006 ,  H04N11/02 ,  H04N19/43 ,  H04N19/51 ,  H04N19/523 ,  H04N19/527 ,  H04N19/547 ,  H04N19/59 ,  H04N19/80

摘要： At the transmitter a coder includes a motion vector generator (10) providing vectors (MV) describing the movement of individual blocks of pixels. The video signal is 4:1 compressed in bandwidth by pre-filters (13) and a sub-sampling unit (12) to produce a signal (SSH) from which a high-definition image can be re-constructed at (14) in the coder and at (14') in the decoder. The sampling lattice is shifted in accordance with the motion vectors (MV) which are digitally transmitted along with the compressed bandwidth analogue signal, to enable the samples to be correctly located in the reconstructed image. Poorly correlated moving areas are handled by pure spatial filtering (pre-filter (16) and sub-sampling unit (18)) with reconstruction (20, 20') by spatial interpolation. The two reconstructed signals (RVH and RVL) at the coder are compared in a mode selector (22) with the input video and a switch (24) is set to transmit whichever of the compressed signals (SSH, SSL) gives the best match. A mode signal is also transmitted and, at the receiver decoder this operates a switch (26) to select (RVH') or (RVL') correspondingly for feeding to the display. In a modified embodiment the sub-sampling unit (12) does not employ a moving lattice but all samples for a four field sequence are taken from one field of each sequence.

摘要翻译： PCT No.PCT / GB86 / 00795 Sec。 371日期：1988年1月25日 102（e）日期1988年1月25日PCT提交1986年12月23日PCT公布。 公开号WO87 / 05770 日期为1987年9月24日。在发射机处，编码器包括提供描述各个像素块的移动的向量（MV）的运动矢量生成器。 视频信号通过预滤波器在带宽中压缩为4:1，并且子采样单元产生信号（SSH），在该信号（SSH）中，可以在编码器和解码器中重构高分辨率图像。 根据与压缩带宽模拟信号一起数字地传输的运动矢量（MV）来移位采样点阵，以使样本能够正确地位于重构图像中。 通过空间插值重构，通过纯空间滤波（预滤波器和次采样单元）来处理相关不足的移动区域。 编码器中的两个重建信号（RVH和RVL）在模式选择器中与输入视频进行比较，并且将开关设置为发送压缩信号（SSH，SSL）中的任何一个给出最佳匹配。 模式信号也被发送，并且在接收器解码器处，这操作开关以相应地选择（RVH'）或（RVL'）以馈送到显示器。 在修改的实施例中，子采样单元不使用移动网格，而是从每个序列的一个字段获取四场序列的所有样本。

公开(公告)号：EP0312200A3

公开(公告)日：1990-08-22

申请号：EP88307742.2

申请日：1988-08-22

申请人： BRITISH BROADCASTING CORPORATION

发明人： Newland, Jonathan David

IPC分类号： H03M13/12

CPC分类号： H03M13/33 ,  H04L27/2332

摘要： Convolutionally encoded data signals (I′, Q′) that have been demodulated after synchronous transmission may well be phase ambiguous depending on the phase of the recovered carrier signal. To ensure correct decoding by a Viterbi or similar probabilistic decoder (30) the demodulated data is synchronised by a synchroniser (9). The demodulated data is first hard-limited (10) and then fed to a matrix (13) to form groups of bits corresponding to each possible phase of the recovered carrier. A sequence of combinations corresponding to one phase is selected by a switch (15) and compared with allowable sequences stored in a memory (22). A controller (17) maintaining an error count monitors the number of unallowable combinations in the sequence and if it reaches a preset level determines that there is a phase error and selects a combination representing a different recovered carrier phase by stepping on the switch (15). A second switch (28) operated in sympathy with the switch (15) selects the correct input combination to the decoder (30) from a quantiser (26) and a matrix (27).

公开(公告)号：EP0171408B1

公开(公告)日：1990-06-13

申请号：EP85900722.1

申请日：1985-02-04

申请人： BRITISH BROADCASTING CORPORATION ,  Etablissement Public de Diffusion dit "Télédiffusion de France" ,  ETAT FRANCAIS représenté par le Ministre des PTT (Centre National d'Etudes des Télécommunications) ,  INDEPENDENT BROADCASTING AUTHORITY ,  THE MARCONI COMPANY LIMITED ,  Philips Electronics N.V. ,  THE PLESSEY COMPANY plc

发明人： BEKER, Henry, Joseph Racal Research Limited ,  BOES, Luc, Emiel, Lucien ,  BRENNAND, Peter, Robert ,  BROWN, Edmund, Raphael ,  CROWTHER, Gerald, Offley ,  DORN, Wilhelmus, Martinus Building BA ,  EDWARDSON, Stanley, Makinson ,  ELY, Stephen, Robert ,  GUILLOU, Louis, Claude ,  JENNER, Peter, Michael Marconi Secure Radio ,  JENNINGS, Sylvia, Mary Racal Research Limited ,  KNEE, Michael, James BBC Research Department ,  MASON, Arthur, Gordon ,  NICOLAS, Jean-Marie, Christophe Laboratoire

IPC分类号： H03K3/84 ,  H04N7/167

CPC分类号： H03K3/84 ,  H04N7/1675

摘要： A pseudo-random binary sequence generator comprises at least one shift register (S, T) arranged in a recirculating loop and having a plurality of logic gates (G) for logically combining the outputs of selected stages of the register to provide a pseudo-random sequence, and a multiplexer (M), having a p data inputs and q address inputs all connected to selected shift register stages, and which selects at any instant one of the p data input bits in accordance with the q-bit address word to provide the generator output. The number s of logic gates is especially high and is related to the total number r of shift register stages (r > p + q) by the expression: 2s >= r2. Some of the shift register stages of the or each shift register are connected to selected data inputs of the multiplexer and others of the stages of the same shift register are connected to selected address inputs of the multiplexer. Switches (SW1-SW4) are provided for regularly loading a re-initialisation word into the shift register(s), and this re-initialisation word can be formed by an arrangement (Fig. 4) which combines a control word with the frame count.

公开(公告)号：EP0352964A2

公开(公告)日：1990-01-31

申请号：EP89307358.5

申请日：1989-07-20

申请人： BRITISH BROADCASTING CORPORATION

发明人： Storey, Richard British Broadcasting Corporation ,  Weston, Martin British Broadcasting Corporation ,  Sandbank, Charles P. British Broadcasting Corp.

IPC分类号： H04N11/00

CPC分类号： H04N11/20 ,  H04N7/125 ,  H04N11/006 ,  H04N11/02 ,  H04N11/167

摘要： In order to achieve increased resolution and to minimise cross-colour and cross-luminance effects in a PAL, NTSC or SECAM encoded signal, a high definition source (20) is pre-filtered at a higher line rate according to one of at least two methods (22, 24, 26). The filtered signal is sub-sampled (at 30, 32) at the source line standard where necessary, depending upon the degree of bandwidth reduction employed and one of the methods of pre-filtering and sub-sampling selected according (at 34) to a control signal (36) dependent on picture content. The luminance and chrominance components of the selected encoded signal are band pass filtered (46, 50, 52) and the chrominance signal modulated onto a sub-carrier (54) such that the frequency spectrum of the luminance and chrominance signals do not overlap.

摘要翻译： 为了实现增加的分辨率并且最小化PAL，NTSC或SECAM编码信号中的交叉色和交叉亮度效应，高清晰度源（20）以较高的线速率根据至少两个 方法（22,24,26）。 根据所采用的带宽减小程度和根据（在34处）选择的预过滤和次采样的方法之一，根据需要，在源线标准处对滤波后的信号进行子采样（在30,32） 控制信号（36）取决于图像内容。 所选编码信号的亮度和色度分量被频带滤波（46,50,52），并且色度信号被调制到子载波（54）上，使得亮度和色度信号的频谱不重叠。