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公开(公告)号：US4862269A
公开(公告)日：1989-08-29
申请号：US222084
申请日：1988-07-20
摘要： In a memory control apparatus for providing various video display functions by means of a video memory into which video data constituting successive units, such as, frames or fields, or video information are written at repeatedly changing write addresses while concurrently reading out the data from repeatedly changing read-out addresses; the video memory is provided with at least four memory areas each having a capacity to store one of the units of video information, impending overtaking of the write and read-out addresses relative to each other is detected, and, in response to such detection, the one of the memory areas in which the data is being written or read-out is changed so as to maintain a separation of the write and read-out addresses sufficient to ensure avoidance of overtaking and consequent disturbance of the displayed image.
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公开(公告)号：US4263675A
公开(公告)日：1981-04-21
申请号：US88852
申请日：1979-10-29
摘要： An automatic fine tuning (AFT) circuit includes a frequency discriminator for discriminating an intermediate frequency signal, a capacitor supplied with the discriminated intermediate frequency signal to produce an AFT voltage thereacross, a comparator circuit for comparing the AFT voltage with a reference voltage, a first switching transistor controlled by the comparator circuit and which supplies and charges the capacitor with the reference voltage during a channel selection operation when the AFT voltage is less than the reference voltage, a second switching transistor controlled by the comparator circuit and which connects the capacitor to ground to discharge the same during a channel selection operation when the AFT voltage is greater than the reference voltage, and a third switching transistor for rendering the comparator circuit operative during a channel selection operation and inoperative during an AFT operation.
摘要翻译： 自动微调（AFT）电路包括用于鉴别中频信号的鉴频器，提供有鉴别中频信号的电容器以产生其上的AFT电压，用于将AFT电压与参考电压进行比较的比较器电路，第一 开关晶体管由比较器电路控制，并且当AFT电压小于参考电压时，在通道选择操作期间向电容器供给和充电电容器，由比较器电路控制并将电容器连接到地的第二开关晶体管 当AFT电压大于参考电压时，在频道选择操作期间对其进行放电;以及第三开关晶体管，用于使比较器电路在频道选择操作期间工作，并且在AFT操作期间不起作用。
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公开(公告)号：US4234963A
公开(公告)日：1980-11-18
申请号：US906406
申请日：1978-05-16
摘要： A synchronous detector adapted to detect a modulated information signal, such as a video IF signal. The modulated information signal is provided in the form of a vestigial sideband signal. A band-pass filter including a tuned circuit tuned to the frequency of the carrier on which the information signal is modulated has a pass band which is less than the frequency spectrum of the vestigial sideband signal so as to limit the frequency spectrum of the signal passed by the filter to a double sideband signal. A limiter is coupled to the band-pass filter to receive the double sideband signal and for deriving a switching carrier therefrom, the frequency of the switching carrier being equal to the frequency of the carrier on which the information signal is modulated. An emitter-follower circuit is connected between the band-pass filter and the limiter so as to couple the double sideband signal from the filter to the limiter. A multiplier circuit has first input terminals coupled to the limiter for receiving the derived switching carrier and second input terminals for receiving the modulated information signal, whereby the modulated information signal is multiplied with the switching carrier to obtain the information signal.
摘要翻译： 一种适用于检测诸如视频IF信号的调制信息信号的同步检测器。 调制信息信号以残留边带信号的形式提供。 包括被调谐到信号信号被调制的载波的频率的调谐电路的带通滤波器具有小于残留边带信号的频谱的通带，以限制通过的信号的频谱 通过滤波器到双边带信号。 限幅器耦合到带通滤波器以接收双边带信号并从其导出交换载波，切换载波的频率等于信息信号被调制的载波的频率。 射频跟随器电路连接在带通滤波器和限幅器之间，以将来自滤波器的双边带信号耦合到限幅器。 乘法器电路具有耦合到限幅器的第一输入端子，用于接收导出的切换载波和用于接收调制信息信号的第二输入端，由此将调制信息信号与切换载波相乘以获得信息信号。
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公开(公告)号：US4110635A
公开(公告)日：1978-08-29
申请号：US715630
申请日：1976-08-18
CPC分类号： H03D1/229 , H03F3/04 , H03F3/42 , H03F3/45089 , H04N5/455
摘要： An amplifier provides a complete video and sound I.F. signal to a synchronous detector switching circuit, and the switching signal to be applied to the switching circuit is obtained from the same amplifier by connecting a grounded base stage, with its emitter impedance, in series with the amplifier load. The grounded base stage has a load tuned to the I.F. carrier frequency, and the filtered signal from the grounded base is the signal applied as the switching signal to the synchronous detector switching circuit.
摘要翻译： 放大器提供完整的视频和声音I.F. 信号发送到同步检测器开关电路，并且通过将接地基站与发射极阻抗串联连接到放大器负载，从同一放大器获得施加到开关电路的开关信号。 接地基座有一个负载调谐到I.F. 载波频率，并且来自接地基极的滤波信号是作为切换信号施加到同步检波器开关电路的信号。
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5.发明授权Video signal processing apparatus, video signal processing method and video source determining method 失效视频信号处理装置，视频信号处理方法和视频源确定方法公开(公告)号：US07283174B2
公开(公告)日：2007-10-16
申请号：US10475732
申请日：2002-04-23
申请人： Masaharu Tokuhara , Toshio Sarugaku , Naoki Kaneko , Seiko Imai
发明人： Masaharu Tokuhara , Toshio Sarugaku , Naoki Kaneko , Seiko Imai
CPC分类号： H04N7/0112 , H04N7/012 , Y10S348/911
摘要： There is provided a video signal processing apparatus that makes it possible to realize a favorable display of pictures by increasing the detection accuracy of the video source of an input video signal and by using an appropriate scanning method for an output video signal in accordance with the determined type of video source. The video signal processing apparatus includes video source determining means for determining whether the video source of a video signal is a film source, calculating means for calculating a degree of difference between a picture of a field of the video signal and a picture of a field of a delayed video signal, threshold setting means, comparison means for comparing the degree of difference and a threshold and determining whether the pictures of each field match, and a signal pattern detecting means for detecting a signal pattern of a signal outputted by the comparison means and determining whether the video source is a film source, with the threshold setting means outputting respectively different thresholds in a state where the video source is determined to be a film source and a state where the video source is not determined to be a film source.
摘要翻译： 提供了一种视频信号处理装置，其可以通过增加输入视频信号的视频源的检测精度并根据确定的输出视频信号使用适当的输出视频信号的扫描方法来实现图像的良好显示 视频源的类型 视频信号处理装置包括：视频源确定装置，用于确定视频信号的视频源是否是电影源;计算装置，用于计算视频信号的场的图像与场的图像之间的差异程度; 延迟视频信号，阈值设定装置，用于比较差异度和阈值并确定每个场的图像是否匹配的比较装置，以及用于检测由比较装置输出的信号的信号模式的信号模式检测装置，以及 确定视频源是否是电影源，其中阈值设置装置在视频源被确定为电影源的状态和视频源未被确定为电影源的状态下分别输出不同的阈值。
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公开(公告)号：US4985701A
公开(公告)日：1991-01-15
申请号：US379107
申请日：1989-07-13
IPC分类号： G06F5/00 , G06T9/00 , H03M7/30 , H04N7/01 , H04N11/04 , H04N11/20 , H04N19/00 , H04N19/426 , H04N19/51 , H04N19/59 , H04N19/85
CPC分类号： H03M7/30
摘要： A time-division bit number circuit that comprises a bit number expansion system and/or a bit number reduction system. The bit number expansion system converts an N bits signal to a 2N bits signal, while the bit number reduction system converts the 2N bits signal to the N bits signal where N is an integer. Thus, according to the time-division bit amount circuit, the number of memory can be saved, the area of circuit can be reduced and the pattern area of substrate can be reduced.
摘要翻译： 一种包括位数扩展系统和/或比特数减少系统的时分比特数电路。 位数扩展系统将N位信号转换为2N位信号，而位数减少系统将2N位信号转换为N位信号，其中N是整数。 因此，根据时分比特量电路，可以节省存储器的数量，可以减少电路的面积，并且可以减小衬底的图案区域。
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7.发明授权Adaptive comb filter circuit including a plurality of filters and a switching means which results in improved movement detection in television signals 失效包括多个滤波器的自适应梳状滤波器电路和导致电视信号中的运动检测改善的开关装置
公开(公告)号：US4972259A
公开(公告)日：1990-11-20
申请号：US379054
申请日：1989-07-13
IPC分类号： H04N5/14
CPC分类号： H04N5/144
摘要： A moving detection circuit which has a difference level generator which includes at least a frame delay circuit, and a vertical correlation detector which is connected to the difference signal generator and including a plurality of filters connected to the difference signal generator. A switching circuit for selecting one of the plurality of filters is provided and a control circuit is connected to the vertical correlation detector so as to control the switching circuit in response to the output level of the vertical correlation detector.
摘要翻译： 一种移动检测电路，其具有至少包括帧延迟电路的差分电平发生器和连接到差分信号发生器并包括连接到差分信号发生器的多个滤波器的垂直相关检测器。 提供了用于选择多个滤波器之一的开关电路，并且控制电路连接到垂直相关检测器，以响应于垂直相关检测器的输出电平来控制开关电路。
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公开(公告)号：US4631589A
公开(公告)日：1986-12-23
申请号：US642334
申请日：1984-08-20
IPC分类号： H04N5/16
CPC分类号： H04N5/165
摘要： A dark signal component below a predetermined level of a video signal is varied such that a dark peak level is made to coincide with a pedestal level by feedback control. According to this configuration, a signal component toward a white level side above the predetermined level is not changed by dark restoration, thus obtaining stable color reproduction and stable brightness which are not affected by the dark restoring operation.
摘要翻译： 改变低于视频信号的预定电平的暗信号分量，使得通过反馈控制使暗峰电平与基座电平一致。 根据该结构，通过暗恢复不会改变朝向高于预定电平的白电平侧的信号分量，从而获得不受暗恢复操作影响的稳定的色彩再现和稳定的亮度。
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公开(公告)号：US4238771A
公开(公告)日：1980-12-09
申请号：US886427
申请日：1978-03-14
摘要： A muting circuit for a television or AM signal receiver which uses a synchronous detector.The muting circuit includes an input terminal for receiving an amplitude modulated signal, a synchronous detector for detecting such AM signal, a circuit for supplying a reference signal having a predetermined frequency and phase to the synchronous detector, an amplifier, a circuit path for delivering to the amplifier the detected signal produced by the synchronous detector, a level detecting device connected to the output of the synchronous detector for producing an excess signal when the detected signal exceeds a predetermined level, an integrator for producing a muting signal in response to the production over an extended period of time of the excess signal, and a switching device connected to the amplifier for muting the signal produced by the amplifier in response to the production of the muting signal.
摘要翻译： 一种使用同步检波器的电视或AM信号接收机的静音电路。 静音电路包括用于接收幅度调制信号的输入端子，用于检测这种AM信号的同步检波器，用于向同步检测器提供具有预定频率和相位的参考信号的电路，放大器，用于传送到 放大器由同步检测器产生的检测信号，电平检测装置连接到同步检测器的输出端，用于当检测信号超过预定电平时产生过量信号;积分器，用于响应于生产过程产生静噪信号 多余信号的延长的时间段以及连接到放大器的开关装置，用于根据产生的静噪信号使由放大器产生的信号静音。
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10.发明授权
公开(公告)号：US4156255A
公开(公告)日：1979-05-22
申请号：US833710
申请日：1977-09-15
CPC分类号： H03J7/045 , H03D1/2281 , H04B1/26
摘要： A television receiver has an automatic fine tuning circuit with a first phase-locked loop including a first low pass filter and a synchronous video detector with a second phase-locked loop including a second low pass filter. The cut off frequency of the first low pass filter is selected lower than the cut-off frequency of the second low pass filter, thereby enabling a stable operation of two phase-locked loops simultaneously.
摘要翻译： 电视接收机具有自动微调电路，其具有包括第一低通滤波器和同步视频检测器的第一锁相环，其具有包括第二低通滤波器的第二锁相环。 第一低通滤波器的截止频率选择为低于第二低通滤波器的截止频率，从而能够同时稳定地操作两个锁相环。
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