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23 条记录 (耗时 0.007 秒)

    Sampling frequency converting apparatus
    1.
    发明公开
    Sampling frequency converting apparatus 失效
    采样频率转换装置

    公开(公告)号：EP0080712A3

    公开(公告)日：1986-11-20

    申请号：EP82110938

    申请日：1982-11-26

    申请人： NEC CORPORATION

    发明人： Takahashi, Hiroshi c/o Nippon Electric Co., Ltd.

    IPC分类号： H04L25/16 ,  H04N09/535

    CPC分类号： H03H17/0685 ,  H04B1/66 ,  H04B1/662 ,  H04N7/0102 ,  H04N9/64

    摘要： A sampling frequency converting apparatus converts an input digital digital signal which is sampled by a first frequency to an output digital signal, which is sampled by a second frequency. The apparatus comprises a memory, a write-address producer which operates in response to the first freqency, a read-address producer which operates in response to the second frequency, and an interpolation circuit. The speed of the converting operation is determined by the high frequency between the first and second frequencies.

    Digital television receiver
    3.
    发明公开
    Digital television receiver 无效
    数字电视接收机

    公开(公告)号：EP0103128A3

    公开(公告)日：1986-03-26

    申请号：EP83107430

    申请日：1983-07-28

    申请人： KABUSHIKI KAISHA TOSHIBA

    发明人： Kudo, Yukinori ,  Suzuki, Susumu

    IPC分类号： H04N09/535

    CPC分类号： H04N9/64 ,  H04N9/78

    摘要： A digital television receiver has a digital conversion circuit (2-23) for converting an analog video signal (1) to a digital video signal (DVS), a process circuit (32-52) for composing digital RGB signals from the digital video signal (DVS), a timing control circuit (27) for controlling the A/D converting operation of the digital conversion circuit and the composing operation of the color process circuit.

    Television signal filtering system
    5.
    发明公开
    Television signal filtering system 失效
    电视信号滤波系统

    公开(公告)号：EP0065881A3

    公开(公告)日：1983-05-04

    申请号：EP82302688

    申请日：1982-05-25

    申请人： RCA CORPORATION

    发明人： Pritchard, Dalton Harold

    IPC分类号： H04N09/535 ,  H04N09/32 ,  H03H15/00

    CPC分类号： H04N9/78

    摘要： A signal separation system is provided which includes a plurality of serially-coupled signal transfer stages (102, 104, 106). A video information signal is applied to an input stage (102) and is delayed by at least the time interval of one horizontal television line (1-H) as it passes through the stages. Various ones of the stages which are 1-H apart in time include outputs, which are combined by weighting function (120-126) and summing or difference circuits (130-136) to produce bandwidth-limited transversal filter output signals. These signals are additively and subtractively combined (140, 150, 160, 156) to produce a combed band passed chrominance signal and a fully restored and combed luminance signal, thereby obviating the need for subsequent filtering before the signals are further processed. The bandwidth-limited signals may also be combined (162) to provide a user adjustable peaking control signal for the luminance information channel.

    Error concealment in digital television signals
    7.
    发明公开
    Error concealment in digital television signals 失效
    数字电视信号中的错误隐藏

    公开(公告)号：EP0048569A3

    公开(公告)日：1982-08-11

    申请号：EP81304131

    申请日：1981-09-09

    申请人： SONY CORPORATION

    发明人： Wilkinson, James Hedley ,  Collins, Mark Christopher

    IPC分类号： H04N09/535 ,  H04N05/94 ,  H04N09/491

    CPC分类号： H04N9/64 ,  H04N9/646 ,  H04N9/888

    摘要： A method of concealing errors in a composite PAL or NTSC digital television signal formed of sample signals corresponding respectively to sample positions along horizontal scan lines of a television picture made up of a plurality of such horizontal lines, comprises, in respect of each sample signal, using a first algorithm to calculate a first expected value of the sample signal, the first algorithm using actual values of adjacent sample signals in the same horizontal line as the sample signal, using a second algorithm to calculate a second expected value of the sample signal, the second algorithm using actual values of adjacent sample signals in the same horizontal line as the sample signal and actual values of adjacent sample signals in the horizontal lines preceding and following the horizontal line of the sample signal, continuously monitoring which of the first and second algorithms gives expected values closer to the actual values, and on occurrence of an error sample signal using the algorithm currently giving the better result to calculate a corrected sample signal to be substituted for the error sample signal.

    Chrominance inverting all-pass filter
    8.
    发明公开
    Chrominance inverting all-pass filter 失效
    反色全通滤镜

    公开(公告)号：EP0122096A3

    公开(公告)日：1986-11-26

    申请号：EP84302205

    申请日：1984-03-30

    申请人： AMPEX CORPORATION

    发明人： Trytko, David E ,  Wagner, Steven D.

    IPC分类号： H04N09/535 ,  H04N09/79 ,  H03H07/00

    CPC分类号： H04N9/882 ,  H04N9/64 ,  H04N9/873

    摘要： An all-pass filter provides inversion of a chrominance component in a composite signal without separating the chrominance component from the composite signal, to provide for example, synthesizing composite video from a previous line of video. The filter includes an input (26') for receiving the composite signal along a subsequent signal path, and the application of selected, preferably symmetrical weighting factors to selected locations along the signal path. The path includes selected delay means (58-64) coupled to define a filter output via summing means (66). The latter provides the composite signal with inverted chrominance without an objectionable change in the relative phase and amplitude of the luminance components relative to the inverted chrominance.