专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

31. 发明申请

WO1996007276A1 DIGITAL NTSC VIDEO SIGNALS 审中-公开
标题翻译：数字NTSC视频信号
公开(公告)号：WO1996007276A1
公开(公告)日：1996-03-07
申请号：PCT/GB1995002059
申请日：1995-08-31
申请人： BRITISH BROADCASTING CORPORATION , THOMAS, Graham, Alexander
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H04N11/04
CPC分类号： H04N11/14
摘要： A component of an NTSC color television signal, e.g. the luminance component, is digitally sampled by sampling an input signal with a mean frequency related to the color subcarrier frequency, e.g. 2fsc, and changing the sampling phase between successive lines of a field by an amount equal to half the interval between samples. The sampling pattern repeats every four fields, and the sampling phase changes by 180 DEG between corresponding points on adjacent pictures. The phase shift between fields (1 and 2) of the four-field structure can be +90 DEG and the phase shift between fields (3 and 4) can be -90 DEG , or vice versa. This can be used in a coding method which involves sub-band analysis filtering the luminance input video signal into a low-frequency luminance signal and a high-frequency luminance signal, sub-band synthesis filtering the high-frequency luminance signal and the chrominance input video signal to form a combined high-frequency signal, and phase-segregated coding the low-frequency luminance signal and the combined high-frequency signal to provide the composite video output signal.
摘要翻译： NTSC彩色电视信号的分量，例如通过对与彩色副载波频率相关的平均频率的输入信号进行采样来数字采样亮度分量，例如， 2fsc，并且将场的相继行之间的采样相位改变等于样本之间的间隔的一半的量。采样模式每四个场重复一次，采样相位在相邻图像对应点之间变化180°。四场结构的场（1和2）之间的相移可以是+90°，场（3和4）之间的相移可以是-90°，反之亦然。这可以用于将亮度输入视频信号的子带分析过滤成低频亮度信号和高频亮度信号的编码方法，对高频亮度信号和色度输入进行子带合成视频信号以形成组合的高频信号，并且对低频亮度信号和组合的高频信号进行相位分离编码以提供复合视频输出信号。

32. 发明申请

WO1995010160A1 METHOD AND APPARATUS FOR DECODING COLOUR VIDEO SIGNALS FOR DISPLAY 审中-公开
标题翻译：用于解码用于显示的彩色视频信号的方法和装置
公开(公告)号：WO1995010160A1
公开(公告)日：1995-04-13
申请号：PCT/GB1994002168
申请日：1994-10-05
申请人： BRITISH BROADCASTING CORPORATION , CHILDS, Ian , ROBERTS, Alan
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H04N09/67
CPC分类号： H04N9/67
摘要： A video display apparatus receives a transmitted colour video signal coded using three system primaries (Rs, Gs, Bs) and decodes the signal for display on a device using four display primaries. The four display primaries are independent, in that no display primary can be expressed as a combination of another two display primaries, and so define a quadrilateral in a chromaticity diagram. A fifth, imaginary display primary is determined as a linear combination of the third and fourth display primaries and the quadrilateral divided into triads defined respectively by the first, fourth and fifth, first, fifth and second, and second, fifth and third display primaries. The received video signal is decoded by three matrix arithmetic units (12, 14, 16), one for each triad, and drive signals for the first to fourth display primaries calculated. For each pixel, an arithmetic unit output producing no negative display drive signals is then selected and its output switched by switches (20, 22, 24) to drive a four-primary display device (2).
摘要翻译：视频显示装置接收使用三个系统原色（Rs，Gs，Bs）编码的发送彩色视频信号，并使用四个显示器原色解码用于在设备上显示的信号。四个显示原色是独立的，因为不显示主要可以表示为另外两个显示基色的组合，因此在色度图中定义四边形。第五虚像显示原色被确定为分别由第一，第四和第五，第一，第五和第二以及第二，第五和第五和第三显示基色定义的第三和第四显示基色和划分成三角形的四边形的线性组合。所接收的视频信号由三个矩阵运算单元（12,14,16）解码，一个用于每个三元组，并且计算第一至第四显示器基准的驱动信号。对于每个像素，然后选择不产生负显示驱动信号的运算单元输出，并且其输出由开关（20,22,24）切换以驱动四主显示装置（2）。

33. 发明申请

WO1994007314A1 METHOD FOR SYNCHRONISING TRANSMITTER FREQUENCIES IN COMMON WAVE DIGITAL AUDIO BROADCAST 审中-公开
标题翻译：共同波形数字音频广播中的发射机频率同步方法
公开(公告)号：WO1994007314A1
公开(公告)日：1994-03-31
申请号：PCT/GB1993001954
申请日：1993-09-15
申请人： BRITISH BROADCASTING CORPORATION , SYKES, John , PARNALL, Simon
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H04H01/00
CPC分类号： H04H20/67 , H04B1/005 , H04B1/0096 , H04B1/28 , H04H20/06 , H04H20/22 , H04H20/74 , H04H40/90 , H04H2201/19 , H04H2201/20 , H04L1/04 , H04L1/06 , H04L27/2602 , H04L27/2647
摘要： A digital broadcast transmission system comprises a plurality of spaced transmitters (6). Each transmitter (6) receives signals for transmission from a master transmitter (2) along with a reference frequency (F ref). The reference frequency is used to generate the transmission frequency at each transmitter. At a receiver (12) conversion means can be used to enable signals from the master transmitter and from the other transmitter to be received.
摘要翻译：数字广播传输系统包括多个间隔发射机（6）。每个发射机（6）接收来自主发射机（2）的发射信号以及参考频率（F ref）。参考频率用于在每个发射机处产生发射频率。在接收机（12）处，可以使用转换装置来使得能够接收来自主发射机和另一发射机的信号。

34. 发明申请

WO1993026086A1 COMPENSATING FOR NON-LINEAR EFFECTS IN SIGNAL PROCESSING WITH ACTIVE DEVICES 审中-公开
标题翻译：对使用活动设备进行信号处理的非线性效应进行补偿
公开(公告)号：WO1993026086A1
公开(公告)日：1993-12-23
申请号：PCT/GB1993001106
申请日：1993-05-27
申请人： BRITISH BROADCASTING CORPORATION , TUPPER, George, Ivor, Frederick , ALLEGRANZA, Anthony, Colin , DOHERTY, Phillip, Joseph
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H03F01/32
CPC分类号： H03F1/3241
摘要： In signal processing circuitry using active devices, non-linearity of the device causes distortion of pure tones and the generation of intermodulation products for more complex signals. The transfer characteristics of such active devices (10) may be considered as the accumulated characteristics of input and output filter stages (12, 16) separated by a non-linear region (14). To compensate for non-linearities and reduce intermodulation products, a drive circuit (18) comprises pre- and post-correction filters (26, 28) separated by a compensating amplifier (20). The frequency response of the pre-correction filter (26) corresponds to that of the input filter stage (12) but is reversed in the frequency spectrum; with conventional I.F. the transfer characteristic of the amplifier (20) and frequency response characteristic of the post-correction filter (28) are the respective complements of those of the non-linear region (14) and pre-correction filter (26). The circuitry may be extended to compensate for active devices having more than one non-linear region and has particular application to klystron amplifiers used in broadcast television transmitters.
摘要翻译：在使用有源器件的信号处理电路中，器件的非线性引起纯音的失真，并产生更复杂信号的互调产物。这种有源器件（10）的传输特性可以被认为是由非线性区域（14）分离的输入和输出滤波器级（12,16）的累积特性。为了补偿非线性并减少互调产物，驱动电路（18）包括由补偿放大器（20）分离的校正后校正滤波器（26,28）。预校正滤波器（26）的频率响应对应于输入滤波器级（12）的频率响应，但在频谱中相反; 与常规I.F. 放大器（20）的传递特性和后校正滤波器（28）的频率响应特性是非线性区域（14）和预校正滤波器（26）的相应补码。电路可以被扩展以补偿具有多于一个非线性区域的有源器件，并且具有特定应用于广播电视发射器中使用的速调管放大器。

35. 发明申请

WO1993017520A1 VIDEO IMAGE PROCESSING 审中-公开
标题翻译：视频图像处理
公开(公告)号：WO1993017520A1
公开(公告)日：1993-09-02
申请号：PCT/GB1993000402
申请日：1993-02-26
申请人： BRITISH BROADCASTING CORPORATION , BURL, Michael
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H04N05/14
CPC分类号： H04N5/145 , H04N7/0132 , H04N7/014 , H04N19/577 , H04N19/80
摘要： A composite time compensated video picture generated from a plurality of input fields includes discontinuities. These are the results of projections from the input fields which include movement. These are detected and then smoothed with a softening filter.
摘要翻译：从多个输入场产生的复合时间补偿视频图像包括不连续性。这些是包括运动在内的输入字段的投影结果。用软化过滤器检测并平滑。

36. 发明申请

WO1993012617A1 IMPROVEMENTS RELATING TO TELEVISION 审中-公开
标题翻译：关于电视的改进
公开(公告)号：WO1993012617A1
公开(公告)日：1993-06-24
申请号：PCT/GB1992002289
申请日：1992-12-10
申请人： BRITISH BROADCASTING CORPORATION , CROLL, Michael, George , EASTERBROOK, James, Edward
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H04N11/00
CPC分类号： H04N11/167 , H04N7/007
摘要： In a letterbox-type video signal, in which a main signal is sent on the lines forming the central three-quarters of the picture, additional helper information is transmitted in the upper and lower borders of the picture. This helper information includes chrominance components that provide enhanced horizontal detail, for vertical frequency components up to a small proportion of the vertical detail carried in the main signal. At the encoder the chrominance components are vertically sub-sampled (16) to produce one line from every six input lines, and are horizontally stretched (18) and split (20) so that each input line extends onto two lines. At the decoder the operations are reversed by retiming onto one line and horizontal compression (42) and vertical super-sampling or interpolation (44). The extra chrominance detail can then be added (46) to the main signal chrominance components to enhance the horizontal detail.

37. 发明申请

WO1993007717A1 METHOD AND APPARATUS FOR SECURE TRANSMISSION OF VIDEO SIGNALS 审中-公开
标题翻译：用于安全传输视频信号的方法和设备
公开(公告)号：WO1993007717A1
公开(公告)日：1993-04-15
申请号：PCT/GB1992001785
申请日：1992-09-29
申请人： BRITISH BROADCASTING CORPORATION , THOMSON CONSUMER ELECTRONICS S.A. , ROBINSON, Adrian, Paul , CLARKE, Christopher, Keith, Perry , BOWER, Andrew, John , COCHON, Etienne , NACCACHE, David , POIVET, Michel , DORNER, Albert
发明人： BRITISH BROADCASTING CORPORATION , THOMSON CONSUMER ELECTRONICS S.A.
IPC分类号： H04N07/167
CPC分类号： H04N7/1696 , C07C67/29 , C08G63/21 , C08G63/676 , H04N7/17327
摘要： Video signals are sampled at 4Fsc locked onto sub-carrier phase and frequency. The active lines of each field are divided into 6 blocks of 47 lines and the active portions of those lines scrambled on a block by block basis by line shuffling. The shuffling algorithm is generated by a line shuffling permutator driven by a PRBS generator (controls 36, 38). Active line samples for one block are written in unscrambled form into a first memory block (32) and samples from the previous block are read out in scrambled form from a second memory block (34) for transmission. The complementary process takes place in the decoder.
摘要翻译：视频信号的采样频率等于4Fsc，频率锁定在副载波的相位和频率上。每个字段的有效行被分成6行，每行47行，并且这些行的有效部分是通过混排行逐块加扰的。混洗算法由由伪随机比特序列发生器控制的线交换置换器产生（命令36,38）。在第一存储块（32）中以非加扰形式记录块的有效行的样本，并且从第二存储块（34）从加扰存储器提取前一块的样本并从一个传输。补充过程发生在解码器中。

38. 发明申请

WO1993005616A1 VIDEO IMAGE PROCESSING 审中-公开
标题翻译：视频图像处理
公开(公告)号：WO1993005616A1
公开(公告)日：1993-03-18
申请号：PCT/GB1992001607
申请日：1992-09-03
申请人： BRITISH BROADCASTING CORPORATION , BURL, Michael , LAYTON, Phillip, Graham
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H04N07/01
CPC分类号： H04N7/014 , G06T7/262 , H04N5/145
摘要： A method of generating motion vectors from a video signal, for use in motion compensation, is applicable to interlaced video signals. In the method alternate video fields are shifted vertically so as to align the picture lines of interlaced fields, by moving the lines of one field up by half a picture line and the lines of the next field down by half a picture line. The fields of each resultant pair are compared to produce a set of motion vectors which can be used to motion compensate the video signal. The accuracy may be improved using temporal filters operative on correlation surfaces derived over two or more field intervals.
摘要翻译：从视频信号生成用于运动补偿的运动矢量的方法适用于隔行视频信号。在该方法中，通过将一个场的线向上移动一半的图像行和下一个场的行下行一半的图像行，交替的视频场被垂直移位以便对准隔行扫描场的图像行。将每个合成对的场进行比较以产生一组可用于运动补偿视频信号的运动矢量。可以使用对在两个或多个场间隔上导出的相关表面进行操作的时间滤波器来提高精度。

39. 发明申请

WO1992013426A1 IMPROVEMENTS RELATING TO VIDEO SIGNALS 审中-公开
标题翻译：关于视频信号的改进
公开(公告)号：WO1992013426A1
公开(公告)日：1992-08-06
申请号：PCT/GB1992000146
申请日：1992-01-24
申请人： BRITISH BROADCASTING CORPORATION , WESTON, Martin
发明人： BRITISH BROADCASTING CORPORATION
IPC分类号： H04N11/16
CPC分类号： H04N11/16
摘要： Cross talk between luminance and chrominance is eliminated in a Weston Clean PAL codec by replacing the band pass filter used in a conventional codec with a high pass filter (L) and introducing a compensating low pass filter (X) into the chrominance path, the filters being chosen such that L=4F'*(1-F') and X(f)=(F'(f):(1-F'(f)) where F'=F(2fsc-f) and L is a low pass (5.5 MHz) filter 248 applied before transmission in the PAL channel.
摘要翻译：通过用高通滤波器（L）代替常规编解码器中使用的带通滤波器并将补偿低通滤波器（X）引入色度路径，滤波器在Weston Clean PAL编解码器中消除亮度和色度之间的串扰，滤波器被选择为L = 4F'*（1-F'）和X（f）=（F'（f）：（1-F'（f）），其中F'= F（2fsc-f）在PAL通道中传输之前应用的低通（5.5MHz）滤波器248。

40. 发明申请

WO1991011076A2 VIDEO DISPLAY SYSTEM 审中-公开
标题翻译：视频显示系统
公开(公告)号：WO1991011076A2
公开(公告)日：1991-07-25
申请号：PCT/GB1991000092
申请日：1991-01-22
申请人： BRITISH BROADCASTING CORPORATION
发明人： BRITISH BROADCASTING CORPORATION , ROBERTS, Alan
IPC分类号： H04N09/67
CPC分类号： H04N9/67 , H04N9/68
摘要： A video display system such as a broadcast receiver or a studio monitor is designed to display both MAC-type input signals and HDTV-type input signals, only the latter being of constant luminance type. For MAC signals a normal (Y, U, V to R, G, B), decoder matix is used comprising amplifiers (18, 20, 22) resistors (24A, 24B, 26A, 26B, 26C, 28A, 28B) and further amplifiers (24, 26, 28). The output is applied to a CRT display device (30) having a conventional gamma factor. For HDTV signals, the decoder matrix is augmented by a correction matrix having six or eight circuit sections. Each circuit section comprises resistors (42, 44, 46), an operational amplifier (40), and circuitry including diodes (48, 50) for selecting the output only over a portion of the permissible colour range.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式