公开(公告)号：US5555096A

公开(公告)日：1996-09-10

申请号：US326749

申请日：1994-10-20

申请人： Jae-chun Yoo

发明人： Jae-chun Yoo

IPC分类号： H04N5/92 ,  G11B20/00 ,  H04N9/797 ,  H04N9/83 ,  H04N9/85 ,  H04N9/79

CPC分类号： H04N9/7976

摘要： Folding and unfolding circuits of a video signal in a video recording/reproducing apparatus for recording a video signal of a full bandwidth including a chroma signal and a luma signal on a recording medium having an effective limited bandwidth and reproducing the recorded luma signal and chroma signal into the video signal of a full bandwidth, use a frequency folding technique by means of sub-Nyquist sampling. A region of a high-frequency signal is folded onto a region of a limited low-frequency luma signal. A remaining high-frequency luma signal is folded on the remaining region of the limited low-frequency luma signal, to thereby record the luma signals according to a field period. The full-bandwidth video signal is then reproduced by band-compensation during reproducing. Thus, crosstalk between channels is decreased to thereby obtain a clear picture of high resolution.

摘要翻译： 视频记录/再现装置中的视频信号的折叠和展开电路，用于在具有有效有限带宽的记录介质上记录包括色度信号和亮度信号的全带宽的视频信号，并再现记录的亮度信号和色度信号 进入全带宽的视频信号，通过次奈奎斯特采样采用频率折叠技术。 高频信号的区域被折叠到有限的低频亮度信号的区域上。 剩余的高频亮度信号被折叠在受限的低频亮度信号的剩余区域上，从而根据场周期记录亮度信号。 然后在再现期间通过频带补偿再现全带宽视频信号。 因此，通道之间的串扰减小，从而获得高分辨率的清晰图像。

公开(公告)号：US5430497A

公开(公告)日：1995-07-04

申请号：US562907

申请日：1990-08-06

申请人： Christopher H. Strolle ,  Jung-Wan Ko ,  Raymond A. Schnitzler

发明人： Christopher H. Strolle ,  Jung-Wan Ko ,  Raymond A. Schnitzler

IPC分类号： H04N5/208 ,  H04N5/14 ,  H04N5/91 ,  H04N5/93 ,  H04N7/12 ,  H04N9/79 ,  H04N9/797 ,  H04N11/02 ,  H04N7/00

CPC分类号： H04N5/142 ,  H04N9/7908 ,  H04N9/7976

摘要： Apparatus is disclosed for processing video information which is reproduced from a magnetic recording medium in a video cassette recorder. The luminance portion of the video signal, which is "folded" about a sampling frequency carrier before recording on magnetic tape, is unfolded after being read from the magnetic tape to restore the bandwidth of the signal, and is applied in parallel through horizontal and vertical comb filters. The combined output of the horizontal comb filter and the vertical comb filter may include incompletely cancelled horizontal and vertical components of the folding frequency and sidebands due to the effects of picture contents. An edge detector receptive to the unfolded video signal responds to an encountered brightness edge, and generates a signal which varies the proportions of the video outputs of the horizontal and vertical comb filters in the combined output.

摘要翻译： 公开了用于处理从盒式录像机中的磁记录介质再现的视频信息的装置。 视频信号的亮度部分在从磁带上记录之前被关于采样频率载波“折叠”在从磁带读取之后被展开以恢复信号的带宽，并且通过水平和垂直并行地应用 梳状滤波器 由于图像内容的影响，水平梳状滤波器和垂直梳状滤波器的组合输出可能包括不完全取消的折叠频率和边带的水平和垂直分量。 接收解开的视频信号的边缘检测器响应遇到的亮度边缘，并产生改变组合输出中的水平和垂直梳状滤波器的视频输出的比例的信号。

公开(公告)号：US5187590A

公开(公告)日：1993-02-16

申请号：US737688

申请日：1991-07-30

申请人： Yong-je Kim

发明人： Yong-je Kim

IPC分类号： G11B20/02 ,  H04N5/922 ,  H04N9/793 ,  H04N9/797

CPC分类号： H04N9/7976 ,  H04N9/7933

摘要： An improved adaptive folding circuit for a video signal recording/reproducing system. The improved adaptive folding circuit has an adaptive emphasis circuit and an adaptive deemphasis circuit for receiving a luminance signal. The adaptive emphasis circuit includes a horizontal high pass filter for filtering the luminance signal and a horizontal low pass filter for filtering the luminance signal. A level detector is provided to receive the output of the horizontal high pass filter, the output of the level detector being provided to a look-up-table. A soft switch is controlled by the output of the look-up-table to provide for output of a proper mixture of the outputs of the horizontal high pass filter and/or the horizontal low pass filter. The adaptive deemphasis circuit attenuates the high frequency luminance level and outputs an adaptively deemphasized luminance signal to a modulator for modulation according to a modulation frequency Ff. An adder receives the outputs of the soft switch and the modulator and provides an improved adaptively folded luminance signal for output through a low pass filter and digital-to-analog converter.

摘要翻译： 一种用于视频信号记录/再现系统的改进的自适应折叠电路。 改进的自适应折叠电路具有用于接收亮度信号的自适应加强电路和自适应去加重电路。 自适应强调电路包括用于滤波亮度信号的水平高通滤波器和用于对亮度信号进行滤波的水平低通滤波器。 提供电平检测器以接收水平高通滤波器的输出，电平检测器的输出被提供给查找表。 软开关由查找表的输出控制，以提供水平高通滤波器和/或水平低通滤波器的输出的适当混合的输出。 自适应去加重电路衰减高频亮度电平，并根据调制频率Ff将自适应去加重的亮度信号输出到调制器进行调制。 加法器接收软开关和调制器的输出，并提供改进的自适应折叠亮度信号，以便通过低通滤波器和数模转换器输出。

公开(公告)号：US4831463A

公开(公告)日：1989-05-16

申请号：US9245

申请日：1987-01-30

申请人： Yves C. Faroudja

发明人： Yves C. Faroudja

IPC分类号： H04N5/92 ,  H03H21/00 ,  H04N7/08 ,  H04N7/26 ,  H04N7/46 ,  H04N9/78 ,  H04N9/79 ,  H04N9/797 ,  H04N9/85

CPC分类号： H04N9/85 ,  H04N19/186 ,  H04N19/59 ,  H04N7/0803 ,  H04N9/7908 ,  H04N9/797 ,  H04N9/7976

摘要： Apparatus is disclosed for processing incoming scanning lines of video information having a nominal bandwidth for use with a bandwidth degrading path, such as magnetic tape.A preprocessor includes a preprocessor comb filter for comb filter processing of the incoming scanning lines to assure the presence of spectral gaps between energy groups in the spectrum of the video information. A fold over circuit folds over high frequency video components of the video information about a predetermined folding frequency to provided folded video. A low pass filter filters the resultant folded video to limit the spectrum thereof to be not greatly in excess of one half of the folding frequency.A postprocessor includes an unfolding circuit for unfolding the signal from the path about the predetermined folding frequency. A postprocessor comb filter processes the unfolded signal to eliminate unwanted alias components therein resulting during the unfolding process and provides a resultant video signal closely approximating the bandwidth and content of the original video information.

摘要翻译： 公开了用于处理具有用于带宽降级路径（如磁带）的标称带宽的输入扫描线的设备。 预处理器包括预处理器梳状滤波器，用于对输入的扫描线进行梳状滤波处理，以确保视频信息的频谱中能量组之间存在频谱间隙。 折叠电路将关于预定折叠频率的视频信息的高频视频分量折叠以提供折叠视频。 低通滤波器对所得到的折叠视频进行滤波，以将其频谱限制在不大于折叠频率的一半的范围。 后处理器包括用于展开围绕预定折叠频率的路径的信号的展开电路。 后处理器梳状滤波器处理展开的信号以消除在展开过程期间产生的不需要的别名分量，并提供紧密接近原始视频信息的带宽和内容的合成视频信号。

公开(公告)号：US6104863A

公开(公告)日：2000-08-15

申请号：US910491

申请日：1992-07-08

申请人： Christopher H. Strolle ,  Jung Wan Ko ,  Raymond Schnitzler

发明人： Christopher H. Strolle ,  Jung Wan Ko ,  Raymond Schnitzler

IPC分类号： H04N5/93 ,  H04N9/78 ,  H04N9/797 ,  H04N9/80 ,  H04N9/82 ,  H04N9/83 ,  H04N9/835 ,  H04N9/898 ,  H04N5/76

CPC分类号： H04N9/835 ,  H04N9/7976 ,  H04N9/80 ,  H04N9/8205 ,  H04N9/831 ,  H04N9/898

摘要： In video tape recording apparatus composite video signals are separated into their luminance and chrominance components for processing prior to recording. The luminance components are digitized, adaptively temporal and spatial filtered, and folded into a reduced frequency spectrum to generate a digital signal that is converted to analog form to modulate the frequency of the luminance carrier signal used in video tape recording. The chrominance components are converted to the color-under signals used in video tape recording. In video tape playback apparatus the color-under signals are converted up in frequency to provide chrominance components for inclusion in reproduced composite video signals. Also, in the video tape playback apparatus, the frequency modulation of the luminance carrier signal is detected to recover folded luminance signals which are digitized, time-base-corrected, unfolded, and adaptively temporal and spatial filtered to suppress aliases associated with unfolding to generate a digital signal that is converted to analog form to provide luminance components for inclusion in reproduced composite video signals. The backward compatability of the video tape recordings when playing them back in video tape playback apparatus already in the field is accomodated by de-emphasizing the high frequencies of the luma during recording. The high frequencies of the luma can be re-emphasized during playback to maintain substantially full NTSC or PAL luminance bandwidth.

摘要翻译： 在录像带记录装置中，复合视频信号被分离成它们的亮度和色度分量，以便在记录之前进行处理。 亮度分量被数字化，自适应地进行时间和空间滤波，并折叠成降频频谱，以产生转换为模拟形式的数字信号，以调制录像带中使用的亮度载波信号的频率。 色度分量被转换为录像带中使用的彩色信号。 在视频磁带播放装置中，彩色信号在频率上被转换，以提供色度分量以包括在再现的复合视频信号中。 此外，在视频磁带播放装置中，检测亮度载波信号的频率调制，以恢复经数字化，时基校正，解折叠的折叠亮度信号，并进行自适应时间和空间滤波，以抑制与展开相关的别名以产生 被转换为模拟形式以提供用于包含在再现的复合视频信号中的亮度分量的数字信号。 当录像带录制的录像带回放在已经在现场的录像带播放装置中的向后兼容性是通过在记录期间强调亮度的高频度来实现的。 在重放期间可以重新强调亮度的高频，以保持基本上完整的NTSC或PAL亮度带宽。

公开(公告)号：US5576837A

公开(公告)日：1996-11-19

申请号：US296796

申请日：1994-08-26

申请人： Christopher H. Strolle ,  Hermann J. Weckenbrock

发明人： Christopher H. Strolle ,  Hermann J. Weckenbrock

IPC分类号： H04N5/93 ,  H04L27/00 ,  H04N5/76 ,  H04N5/92 ,  H04N7/12 ,  H04N9/78 ,  H04N9/797 ,  H04N9/80 ,  H04N9/82 ,  H04N9/83 ,  H04N9/835 ,  H04N9/84 ,  H04N9/898 ,  H04N9/79 ,  H04N11/02 ,  H04N11/04

CPC分类号： H04N9/7976 ,  H04N9/797 ,  H04N9/80 ,  H04N9/8205 ,  H04N9/831 ,  H04N9/835 ,  H04N9/84 ,  H04N9/898

摘要： Apparatus useful in electronics for the tape recording of a video signal, which is a baseband signal of a prescribed bandwidth extending up to a prescribed maximum frequency, processes the video signal to generate a folded-spectrum video signal. The video signal is digitized and supplied to a digital band-splitting filter with a cross-over frequency at one-half said prescribed maximum frequency, for separating the digitized video signal into samples of a lower-frequency-band component and into samples of a higher-frequency-band component. A balanced modulator is connected for modulating a folding carrier wave of the prescribed maximum frequency, which modulation is done in accordance with the higher-frequency-band component to generate a balanced modulation signal; and the balanced modulation signal is linearly combined with the lower-frequency-band component to generate the folded-spectrum video signal. Preferably, the sampling rate of the digitized video signal is exactly the Nyquist rate of the prescribed maximum frequency, reduces the balanced modulation of a suitably phased folding carrier wave to multiplication of successive samples of the modulating signal alternately by plus one and by minus one. Such multiplications are done without having to use a digital multiplier.

公开(公告)号：US5365281A

公开(公告)日：1994-11-15

申请号：US903942

申请日：1992-06-26

申请人： Jung-Wan Ko ,  Christopher H. Strolle

发明人： Jung-Wan Ko ,  Christopher H. Strolle

IPC分类号： H04N5/14 ,  H04N9/797 ,  H04N9/64 ,  H04N7/18

CPC分类号： H04N5/144 ,  H04N9/7976

摘要： A motion signal detection circuit adapted to a video recording/reproducing apparatus having a frequency unfolding circuit for unfolding a luminance signal of a high frequency component included in the luminance signal of a low frequency component into an original frequency band, comprising a prefilter for eliminating the folding carrier and sidebands thereof included in the video signal unfolded by the frequency unfolding circuit, a comb filter for filtering the output of the prefilter to detect a motion signal, an error compensation circuit for compensating the errors included in the motion signal output from the comb filter.

公开(公告)号：US5113262A

公开(公告)日：1992-05-12

申请号：US569029

申请日：1990-08-17

申请人： Christopher H. Strolle ,  Chandrakant B. Patel ,  Werner F. Wedam ,  Jung W. Ko ,  Raymond Schnitzler ,  Jong K. Yun

发明人： Christopher H. Strolle ,  Chandrakant B. Patel ,  Werner F. Wedam ,  Jung W. Ko ,  Raymond Schnitzler ,  Jong K. Yun

IPC分类号： H04N9/797 ,  H04N9/80 ,  H04N9/82 ,  H04N9/898

CPC分类号： H04N9/8205 ,  H04N9/7976 ,  H04N9/80 ,  H04N9/898

摘要： An improved video signal recording system for recording a full bandwidth video signal on a limited bandwidth medium is disclosed. The recording system includes an encoder, coupled to an input terminal, for adaptively processing a composite video signal in response to a motion representative signal, and producing two signals; a luminance signal, having attenuated high frequencies subsampled so as to be folded into a spectral hole in the low frequencies, and being bandwidth limited to the limited bandwidth of the recording medium; and a combined signal including a chrominance and a motion component. Luminance signal recording circuitry records the folded luminance signal on the medium and chrominance signal recording circuitry records the combined chrominance and motion signal on the medium. An improved video signal playback system for reproducing such a prerecorded video signal is also disclosed. The playback system consists of a luminance signal playback circuit for retrieving the prerecorded luminance signal from the medium, and chrominance signal playback circuit for retrieving the prerecorded combined chrominance and motion signals from the medium. A decorder extracts the motion signal and the chrominance signal from the combined chrominance and motion signal and an unfolding circuit extracts the luminance high frequencies from the prerecorded folded luminance signal and adaptively regenerates the full bandwidth luminance signal in response to the motion signal. This regenerated full bandwidth luminance signal is combined with the chrominance signal to reproduce the originally recorded composite video signal. A recording medium previously recorded by such a recording system is capable of being played back on a standard playback system without objectionably artifacts in the reproduced image.

摘要翻译： 公开了一种用于在有限带宽介质上记录全带宽视频信号的改进的视频信号记录系统。 记录系统包括耦合到输入端的编码器，用于响应运动代表信号自适应地处理复合视频信号，并产生两个信号; 亮度信号，具有被衰减的高频，被采样以被折叠成低频中的频谱孔，并且带宽被限制到记录介质的有限带宽; 以及包括色度和运动分量的组合信号。 亮度信号记录电路将折叠的亮度信号记录在介质上，色度信号记录电路在介质上记录组合的色度和运动信号。 还公开了一种用于再现这种预先记录的视频信号的改进的视频信号播放系统。 播放系统由用于从介质中检索预先记录的亮度信号的亮度信号重放电路和用于从介质中检索预先记录的组合色度和运动信号的色度信号重放电路组成。 解码顺序从组合的色度和运动信号中提取运动信号和色度信号，展开电路从预先记录的折叠亮度信号中提取亮度高频，并根据运动信号自适应地再生全带宽亮度信号。 该再生的全带宽亮度信号与色度信号组合以再现原始记录的复合视频信号。 由这样的记录系统预先记录的记录介质能够在标准的回放系统上进行再现，而不会在再现的图像中产生不必要的伪影。

公开(公告)号：US5596418A

公开(公告)日：1997-01-21

申请号：US478766

申请日：1995-06-07

申请人： Christopher H. Strolle ,  Allen L. Limberg ,  Werner F. Wedam ,  Raymond Schnitzler ,  Hermann J. Weckenbrock ,  Jung W. Ko ,  Jong K. Yun

发明人： Christopher H. Strolle ,  Allen L. Limberg ,  Werner F. Wedam ,  Raymond Schnitzler ,  Hermann J. Weckenbrock ,  Jung W. Ko ,  Jong K. Yun

IPC分类号： H04N5/923 ,  H04N9/797 ,  H04N9/80 ,  H04N9/82 ,  H04N9/898 ,  H04N9/79

CPC分类号： H04N5/923 ,  H04N9/7976 ,  H04N9/80 ,  H04N9/8205 ,  H04N9/898

摘要： A system for reproducing a luminance signal from a medium containing a previously recorded luminance signal with a high-frequency portion thereof compressed in dynamic range includes a circuit for recovering that luminance signal from the medium. Filtering is done to separate the low-frequency and compressed-in-dynamic-range high-frequency portions of the recovered luminance signal from each other. A corer responds to the separated compressed-in-dynamic-range high-frequency portion of the recovered luminance signal to provide a cored high-frequency portion with expanded dynamic range and reduced noise. The level of the cored high-frequency portion with expanded dynamic range and reduced noise is then boosted by a predetermined amount to compensate for energy losses during the compression of the dynamic range and added back to the low-frequency portion of the recovered luminance signal to reproduce a full-band luminance signal with at least partially restored dynamic range for high-frequencies and without readily visible high-frequency noise.

摘要翻译： 一种用于从包含先前记录的亮度信号的介质再现亮度信号的系统，其中其高频部分在动态范围内被压缩，包括用于从介质中恢复该亮度信号的电路。 完成滤波以将恢复的亮度信号的低频和压缩在动态范围的高频部分彼此分离。 核心部分对恢复的亮度信号的分离压缩在动态范围高频部分进行响应，以提供具有扩展的动态范围和降低的噪声的核心高频部分。 然后将具有扩大的动态范围和降低的噪声的核心高频部分的电平提升预定量，以补偿在动态范围的压缩期间的能量损失，并将其恢复到恢复的亮度信号的低频部分， 再现具有用于高频的至少部分恢复的动态范围的全频带亮度信号，并且没有容易看到的高频噪声。

公开(公告)号：US5532820A

公开(公告)日：1996-07-02

申请号：US819890

申请日：1992-01-13

申请人： Christopher H. Strolle ,  Hermann J. Weckenbrock

发明人： Christopher H. Strolle ,  Hermann J. Weckenbrock

IPC分类号： H04N5/93 ,  H04L27/00 ,  H04N5/76 ,  H04N5/92 ,  H04N7/12 ,  H04N9/78 ,  H04N9/797 ,  H04N9/80 ,  H04N9/82 ,  H04N9/83 ,  H04N9/835 ,  H04N9/84 ,  H04N9/898 ,  H04N9/79

CPC分类号： H04N9/7976 ,  H04N9/797 ,  H04N9/80 ,  H04N9/8205 ,  H04N9/831 ,  H04N9/835 ,  H04N9/84 ,  H04N9/898

摘要： Apparatus useful in electronics for the tape recording of a video signal, which is a baseband signal of a prescribed bandwidth extending up to a prescribed maximum frequency, processes the video signal to generate a folded-spectrum video signal. The video signal is digitized and supplied to a digital band-splitting filter with a cross-over frequency at one-half said prescribed maximum frequency, for separating the digitized video signal into samples of a lower-frequency-band component and into samples of a higher-frequency-band component. A balanced modulator is connected for modulating a folding carrier wave of the prescribed maximum frequency, which modulation is done in accordance with the higher-frequency-band component to generate a balanced modulation signal; and the balanced modulation signal is linearly combined with the lower-frequency-band component to generate the folded-spectrum video signal. Preferably, the sampling rate of the digitized video signal is exactly the Nyquist rate of the prescribed maximum frequency, reduces the balanced modulation of a suitably phased folding carrier wave to multiplication of successive samples of the modulating signal alternately by plus one and by minus one. Such multiplications are done without having to use a digital multiplier.

摘要翻译： 用于磁带记录视频信号的电子设备中的装置，该视频信号是延伸到规定的最大频率的规定带宽的基带信号，处理视频信号以产生折叠频谱视频信号。 视频信号被数字化并提供给具有交叉频率的规定最大频率的二分之一的数字频带分离滤波器，用于将数字化视频信号分离成低频带分量的采样，并将其转换为 较高频带分量。 连接平衡调制器来调制规定的最大频率的折叠载波，该调制根据较高频带分量进行，以产生平衡调制信号; 并且平衡调制信号与低频带分量线性组合以产生折叠频谱视频信号。 优选地，数字化视频信号的采样率恰好是规定的最大频率的奈奎斯特速率，将适当地相位的折叠载波的平衡调制减小到相加的调制信号的连续采样乘以加1和减1。 进行这种乘法而不必使用数字乘法器。