Method and system for compressing video signals
    11.
    发明公开
    Method and system for compressing video signals 失效
    压缩视频信号的方法和系统

    公开(公告)号:EP0221743A3

    公开(公告)日:1987-09-16

    申请号:EP86308304

    申请日:1986-10-24

    IPC分类号: H04N11/02 H04N07/12

    CPC分类号: H04N19/503 H04N11/04

    摘要: A method and system for compressing television video signals for digital transmission allows full motion pictures to be transmitted. The analog signal is digitized and stored in a memory (A) in consecutive pixel value locations. The values of the color components of each pixel value are summed and stored in a memory (B). In the second frame, the sum of each pixel value is compared with the sums stored in memory (B). If the difference is greater than a filter member, then that particular pixel is transmitted by the control computer (27). The total number transmitted for each frame is compared to a maximum allowable data rate, and the filter number is adjusted accordingly.

    VISIBLE LIGHT TRANSMITTER, VISIBLE LIGHT RECEIVER, VISIBLE LIGHT COMMUNICATION SYSTEM, AND VISIBLE LIGHT COMMUNICATION METHOD
    12.
    发明公开
    VISIBLE LIGHT TRANSMITTER, VISIBLE LIGHT RECEIVER, VISIBLE LIGHT COMMUNICATION SYSTEM, AND VISIBLE LIGHT COMMUNICATION METHOD 有权
    具有与可见光和通信方式使可见光可见光通信系统可见光接收器STATION

    公开(公告)号:EP2136484A1

    公开(公告)日:2009-12-23

    申请号:EP07860136.6

    申请日:2007-12-26

    摘要: A visible light communication system having a transmission apparatus for modulating a transmission signal to a multiple-value number and a reception apparatus for demodulating a multiple-value modulated transmission signal is provided. The transmission apparatus includes a plurality of light emitters for emitting light in different colors, a chromaticity coordinates calculator for mapping a digital value to a chromaticity coordinates value, and a light intensity controller for controlling a light intensity of each of the light emitters based on the chromaticity coordinates value corresponding to the digital value. The reception apparatus includes a plurality of light receivers having different spectral characteristics, a chromaticity coordinates calculator for calculating a chromaticity coordinates value according to a received light intensity detected by each of the light receivers, and a demodulator for demodulating the digital value from the chromaticity coordinates value.

    摘要翻译: 提供了一种具有用于调制的发射信号的一个多值的数目和用于解调的多值调制后的发送信号的接收装置的发送装置的可见光通信系统。 所述发送装置包括:光发射器用于发射不同颜色的光的多个,色度坐标计算器,用于将数字值映射到色度坐标值,以及基于所述用于控制每个发光器的光强度的光强度控制装置 色度坐标值对应的数字值。 所述接收装置包括具有不同光谱特性的光接收器复数,色度坐标计算器,用于计算色度坐标值雅丁由每个光接收器检测到的接收光强度,以及用于从色度坐标解调数字值的解调器 值。

    Verfahren zur Datenübertragung
    13.
    发明公开
    Verfahren zur Datenübertragung 失效
    Verfahren zurDatenübertragung。

    公开(公告)号:EP0577202A2

    公开(公告)日:1994-01-05

    申请号:EP93201837.7

    申请日:1993-06-25

    IPC分类号: H04N11/04 H04N9/44 H04N5/76

    摘要: Für ein Verfahren zur Übertragung von Daten von einem digitalen Farbdekoder (1), welcher ein digitales Farb-Bildsignal dekodiert, zu einer anderen Signalverarbeitungseinheit (2), ist zur Vermeidung von Bildstörungen in der Signalverarbeitungseinheit vorgesehen, daß wenigstens ein erstes und ein zweites Digitalsignal von dem Dekoder (1) zu der Signalverarbeitungseinheit (2) seriell übertragen werden, daß das erste Digitalsignal vom Momentanwert einer im Dekoder (1) verwendeten Taktfrequenz abhängig ist, mit der das Digitalsignal in dem Dekoder (1) verarbeitet wird, und daß das zweite Digitalsignal vom Momentanwert einer im Dekoder (1) erzeugten Farb-Hilfsträgerfrequenz abhängig ist, die zur Farb-Dekodierung eingesetzt wird.

    摘要翻译: 对于从将数字彩色视频信号解码的数字彩色解码器(1)的数据发送到另一个信号处理单元(2)的方法,为了防止信号处理单元中的图像干扰, 至少第一数字信号和第二数字信号从解码器(1)串行发送到信号处理单元(2),第一数字信号取决于在解码器(1)中使用的时钟频率的瞬时值,由 在解码器(1)中处理数字信号的装置,并且第二数字信号取决于用于彩色解码的解码器(1)中生成的彩色副载波频率的瞬时值。

    Clock generation circuit for multistandard serial digital video with automatic format identification
    14.
    发明公开
    Clock generation circuit for multistandard serial digital video with automatic format identification 失效
    具有自动格式识别功能的多系列数字视频时钟发生电路

    公开(公告)号:EP0511798A3

    公开(公告)日:1993-11-10

    申请号:EP92303744.4

    申请日:1992-04-24

    IPC分类号: H04N5/46 H03L7/18

    摘要: A voltage controlled reference oscillator (20) with a high Q and narrow tunability bandwidth produces an output oscillator frequency which is frequency divided (18) by four alternative constants to produce four different clock frequencies for four different digital video standards, D1 component at 270 MHz, NTSC D2 composite at 143 MHz, PAL D2 composite at 177 MHz, and a proposed new composite video standard that is to operate at a 360 MHz clock rate. Automatic identification of which serial digital video is present is accomplished by having the clock generator (20,18) produce a clock signal at the frequency required by one of the video formats while a phase lock loop (90,26) attempts to lock onto the incoming signals at that frequency. If no lock occurs within a predetermined time interval, the clock generator (20,18) is made to produce a clock signal at the frequency required by a different one of the video formats and the phase lock (90,26) is attempted again. This is repeated until a lock is attained. Optionally, when a lock occurs, the video is tested (80) for validity within the format that is consistent with the clock frequency that produced the lock.

    Procédé de traitement d'un signal vidéo
    15.
    发明公开
    Procédé de traitement d'un signal vidéo 失效
    Videosignalverarbeitungsverfahren。

    公开(公告)号:EP0466554A1

    公开(公告)日:1992-01-15

    申请号:EP91401814.8

    申请日:1991-07-02

    IPC分类号: H04N5/44

    摘要: La présente invention concerne un procédé de traitement d'un signal vidéo codé sous forme de blocs de k mots, ce signal étant écrit dans ou lu à partir de deux mémoires de trame (FM1,FM2) comportant chacune un port d'entrée, un port de sortie à vitesse rapide et un port de sortie à vitesse lente.
    D'après ce procédé, le signal vidéo numérique en entrée est formé par des ensembles de M′ blocs avec N′ blocs contenant des données de luminance (Y1, Y2,... ) et M′-N′ blocs contenant des données de chrominance (C1, C2,...), les blocs contenant les données de chrominance (C1) étant inscrits dans la première mémoire (FM1) et les blocs contenant les données de luminance (Y1) étant inscrits dans la deuxième mémoire (FM2), les mémoires étant inversées à chaque trame. Ensuite les blocs contenant les données de luminance et les blocs contenant les données de chrominance sont lus simultanément sur le port de sortie à vitesse rapide de chaque mémoire, les mémoires étant inversées à chaque trame, et les données sont éventuellement traitées de manière à obtenir en sortie des données vidéo présentant un rapport de compression de M/N avec M > N.
    Application à la télévision.

    摘要翻译: 本发明涉及一种用于处理以k个字的块形式编码的视频信号的方法,该信号被写入或从两个帧存储器(FM1,FM2)中读取,每个帧存储器包括输入端口,高速输出端口 和一个低速输出端口。 根据该方法,输入的数字视频信号是由含有亮度数据(Y1,Y2,...)和含有色度数据(C1,C2)的M'-N'块的具有N'个块的M'块组成的 ,...),将含有色度数据(C1)的块写入到第一存储器(FM1)中,并且将包含亮度数据(Y1)的块写入第二存储器(FM2),每个存储器被反转 帧。 接下来,在每个存储器的高速输出端口上同时读取包含亮度数据的块和包含色度数据的块,每个帧将存储器反转,并且可选地处理数据以在输出端获得 视频数据呈现M / N的压缩比,M> N。应用于电视机。

    Colour video signal processing apparatus
    17.
    发明公开
    Colour video signal processing apparatus 失效
    彩色视频信号处理设备

    公开(公告)号:EP0068810A3

    公开(公告)日:1984-08-22

    申请号:EP82303278

    申请日:1982-06-23

    申请人: SONY CORPORATION

    发明人: Asaida, Takashi

    IPC分类号: H04N09/535

    CPC分类号: H04N9/64 H04N11/04

    摘要: A colour video signal processing apparatus supplied with luminance data (Y) and first and second colour difference data (I, Q), each being digitized at a first sampling frequency and formed by matrix calculations (4), wherein at least one of the first and second colour difference data (I, Q) is sampled (61, 6Q) at a second sampling frequency which is equal to the first sampling frequency divided by an integer, the band of the sampled output is limited to be a predetermined band by a digital filter (71, 7Q), and the luminance data (Y) and said first and second colour difference data (I, Q) whose bands have been limited are transmitted as recorded (10).

    Methods of and arrangements for decoding and recoding composite digital television signals
    18.
    发明公开
    Methods of and arrangements for decoding and recoding composite digital television signals 失效
    解码和编码复合数字电视信号的方法和装置

    公开(公告)号:EP0033607A3

    公开(公告)日:1982-02-10

    申请号:EP81300245

    申请日:1981-01-20

    申请人: SONY CORPORATION

    IPC分类号: H04N09/493 H04N09/39

    摘要: A decoder-recoder arrangement (1) for decoding a composite digital television signal for recording on a digital video recorder (8) and for subsequently recoding the reproduced signal, the arrangement comprising a decoder (6) including filters (11, 15 and 16) for separating two chrominance components from the composite digital television signal, demodulators (17 and 18) for demodulating the chrominance components, sample rate reducers (19 and 24) for reducing the sample rates of the demodulated chrominance components, interpolators (21 and 26) for interpolating samples into the sample-reduced demodulated chrominance components to restore the sample rate to the original value,modulators (22 and 27) for remodulating the interpolated chrominance components an adder (23) for adding together the modulated interpolated chrominance components, and a subtractor (13) for subtracting the output of the adder (23) from the input composite digital television signal; and a recoder (7) including interpolators (32 and 35) for interpolating samples into said sample-reduced demodulated chrominance components to restore the sample rate to the original sample value, modulators (33 and 36) for modulating the interpolated chrominance components obtained from the interpolators (32 and 35), an adder (34) for adding together the outputs of the modulators (33 and 36), and an adder (30) for adding the output of the adder (34) to the output of the subtractor (13) to derive the original composite digital television signal.