公开(公告)号：US5745635A

公开(公告)日：1998-04-28

申请号：US8813

申请日：1993-01-25

申请人： Christopher H. Strolle ,  Raymond A. Schnitzler

发明人： Christopher H. Strolle ,  Raymond A. Schnitzler

IPC分类号： H04N5/922 ,  H04N5/923 ,  H04N7/12 ,  H04N9/793 ,  H04N9/797 ,  H04N9/82 ,  H04N9/835 ,  H04N9/85 ,  H04N5/76

CPC分类号： H04N9/7976 ,  H04N5/923 ,  H04N9/8205 ,  H04N9/835 ,  H04N9/85

摘要： A video signal recording system is disclosed which includes a circuit for generating a control signal representative of the level of the high-frequency portion of a full-bandwidth luminance signal. An adaptive deemphasis circuit reduces the level of the high-frequency portion of the luminance signal in response to the control signal. A folding circuit folds the high-frequency portion of the deemphasized luminance signal into the low-frequency portion. The folded deemphasized luminance is combined with the control signal and recorded on the video tape. A video signal playback system is disclosed which includes a circuit for separating the previously recorded control signal from the previously recorded folded deemphasized luminance signal. An unfolding circuit unfolds the played back luminance signal to produce a wide bandwidth deemphasized luminance signal. An adaptive reemphasis circuit boosts the level of the high-frequency portion of the unfolded luminance signal in response to the separated control signal.

摘要翻译： 公开了一种视频信号记录系统，其包括用于产生表示全带宽亮度信号的高频部分的电平的控制信号的电路。 自适应去加重电路响应于控制信号降低亮度信号的高频部分的电平。 折叠电路将去加重亮度信号的高频部分折叠成低频部分。 将折叠的不加重亮度与控制信号组合并记录在录像带上。 公开了一种视频信号播放系统，其包括用于将先前记录的控制信号与先前记录的折叠去加重亮度信号分离的电路。 展开电路展开回放的亮度信号以产生宽带的去加重亮度信号。 自适应再加重电路响应于分离的控制信号而提高展开的亮度信号的高频部分的电平。

公开(公告)号：US5274464A

公开(公告)日：1993-12-28

申请号：US881131

申请日：1992-05-11

申请人： Christopher H. Strolle ,  Raymond A. Schnitzler

发明人： Christopher H. Strolle ,  Raymond A. Schnitzler

IPC分类号： H04N5/926 ,  H04N7/12 ,  H04N9/79 ,  H04N5/76

CPC分类号： H04N5/9261 ,  H04N7/125 ,  H04N9/79

摘要： A television signal having a luminance spectrum extending from zero to f.sub.h in horizontal spatial frequencies and from zero to f.sub.v in vertical spatial frequencies is recorded on a video tape. A folded-spectrum signal is generated for recording by modulating the luminance signal onto a folding carrier of (f.sub.h /2, f.sub.v /2) complex spatial frequency. This is done by heterodyning the luminance signal with a folding carrier wave and then selecting as said folded-spectrum signal only the baseband portion of the resulting signal. At least when there is change between successive television images, the luminance signal is pre-filtered by a low-pass spatial filter that separates the two-dimensional image spectral domain into a pass band region and into an attenuation band region. Each point in the passed region has a corresponding mirror point in the attenuated region as mirrored about a complex spatial frequency (f.sub.h /4, f.sub.v /4) in both horizontal and vertical directions. During subsequent playback the folded-spectrum signal recovered from the tape is unfolded by heterodyning it with the folding carrier wave and selecting only the baseband portion of the resulting signal. At least when there is change between successive television images, the unfolded-spectrum signal is passed through a low-pass spatial reconstruction filter similar to that used as a recording pre-filter, and accompanying aliases are attenuated by the reconstruction filter.

摘要翻译： 具有在水平空间频率中从0到fh的亮度谱和垂直空间频率从0到fv的电视信号被记录在录像带上。 通过将亮度信号调制到（fh / 2，fv / 2）复数空间频率的折叠载体上，产生用于记录的折叠频谱信号。 这是通过用折叠载波对亮度信号进行外差，然后仅将所得信号的基带部分选择为所述折叠频谱信号来完成的。 至少当连续的电视图像之间有变化时，亮度信号由低通空间滤波器进行预滤波，该低通空间滤波器将二维图像频域分离成通带区域并进入衰减带区域。 通过区域中的每个点在衰减区域中具有相对于水平和垂直方向上的复杂空间频率（fh / 4，fv / 4）的镜像点。 在随后的重放期间，从磁带恢复的折叠频谱信号通过用折叠载波进行外差展开并仅选择所得信号的基带部分来展开。 至少当连续电视图像之间有变化时，展开频谱信号通过类似于用作记录预滤波器的低通空间重构滤波器，伴随的别名被重构滤波器衰减。

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。