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51. 发明授权

US5481316A System, apparatus and method for canceling televison ghost signals 失效
标题翻译：用于取消电视幽灵信号的系统，装置和方法
公开(公告)号：US5481316A
公开(公告)日：1996-01-02
申请号：US921686
申请日：1992-07-30
申请人： Chandrakant B. Patel
发明人： Chandrakant B. Patel
IPC分类号： H04N5/21
CPC分类号： H04N5/211
摘要： A ghost canceling reference signal transmission and reception system utilizes a ghost canceling reference signal including a zero to seventy IRE step followed by a seventy to zero IRE (sin x)/x step.
摘要翻译：重影消除参考信号发送和接收系统利用包括零到七十个IRE步骤之后是七十到零IRE（sin x）/ x步长的重影消除参考信号。

52. 发明授权

US5461426A Apparatus for processing modified NTSC television signals, with digital signals buried therewithin 失效
标题翻译：用于处理修改后的NTSC电视信号的装置，其中埋有数字信号
公开(公告)号：US5461426A
公开(公告)日：1995-10-24
申请号：US108311
申请日：1993-08-20
申请人： Allen L. Limberg , Chandrakant B. Patel , Tianmin Liu
发明人： Allen L. Limberg , Chandrakant B. Patel , Tianmin Liu
IPC分类号： H04N5/21 , H04N7/04 , H04N7/081 , H04N11/24 , H04N7/08
CPC分类号： H04N7/081 , H04N11/008 , H04N5/211 , H04N7/04
摘要： A relatively low power phase-shift-keyed (PSK) subcarrier encoding digital information is admixed with composite video signal. The PSK subcarrier is at an odd multiple of half the scan line frequency of the composite video signal, and the symbol rate is at a multiple of the scan line frequency. The PSK subcarrier modulates the amplitude of a suppressed carrier which is the same frequency as the video carrier for the composite video signal and preferably is in quadrature phasing therewith. To reduce evidence of the PSK subcarrier in television picture generated from that composite video signal, the PSK subcarrier is interrupted after each of periods of one frame duration and repeated in anti-phase during the next period of one frame duration. This also provides a basis for separating the PSK subcarrier from static luminance signal components by bandpass frame-comb filtering. Preferably, in the scan lines of consecutive pairs of scan lines, the PSK subcarrier is repeated with phase reversal of the subcarrier between scan lines, and the chroma subcarrier is repeated. This provides a basis for separating PSK subcarrier from chroma subcarrier by lowpass line-comb filtering.
摘要翻译：将相对较低功率的相移键控（PSK）副载波编码数字信息与复合视频信号相混合。 PSK副载波为复合视频信号的扫描线频率的一半的奇数倍，符号率为扫描线频率的倍数。 PSK副载波调制与复合视频信号的视频载波相同的频率的抑制载波的振幅，并且优选与其正交相位调制。为了减少从该复合视频信号产生的电视图像中的PSK副载波的证据，PSK副载波在一个帧持续时间的每个周期之后被中断，并且在一个帧持续时间的下一个周期内被反相重复。这还提供了通过带通帧梳状滤波将PSK副载波与静态亮度信号分量分离的基础。优选地，在连续的扫描线对的扫描线中，通过扫描线之间的副载波的相位反复来重复PSK子载波，并且重复色度副载波。这为通过低通线梳梳滤波分离PSK副载波与色副载波提供了基础。

53. 发明授权

US5294979A Estimation of noise using burst gate response to video signal 失效
标题翻译：使用突发门控响应视频信号估计噪声
公开(公告)号：US5294979A
公开(公告)日：1994-03-15
申请号：US73478
申请日：1993-06-09
申请人： Chandrakant B. Patel , Hermann J. Weckenbrock , Werner F. Wedam , Ted N. Altman
发明人： Chandrakant B. Patel , Hermann J. Weckenbrock , Werner F. Wedam , Ted N. Altman
IPC分类号： H04N5/21 , H04N17/02 , H04N17/00 , H04N5/08 , H04N5/213 , H04N9/64
CPC分类号： H04N17/02
摘要： Noise estimation circuitry for estimating the noise in a small number of horizontal scanning lines of a video signal includes a lowpass line comb filter responding to said video signal, but not to chrominance-descriptive components thereof. The video signal free from chrominance-descriptive components is repeatedly sampled during the backporch interval of each horizontal scanning line, and the samples are accumulated to generate a revised noise estimate each successive horizontal scanning line.
摘要翻译：用于估计视频信号的少量水平扫描线中的噪声的噪声估计电路包括响应于所述视频信号的低通线梳状滤波器，但不对其色度描述的分量。在每个水平扫描线的后续间隔期间重复采样没有色度描述分量的视频信号，并且累积采样以产生每个连续的水平扫描线的修正的噪声估计。

54. 发明授权

US5196851A Linearizing non-linear analog-to-digital process and circuit 失效
标题翻译：线性化非线性模拟数字到数字处理和电路
公开(公告)号：US5196851A
公开(公告)日：1993-03-23
申请号：US704986
申请日：1991-05-24
申请人： Chandrakant B. Patel , Thomas Meyer
发明人： Chandrakant B. Patel , Thomas Meyer
IPC分类号： H03M1/10 , H03M1/12
CPC分类号： H03M1/1042 , H03M1/12
摘要： A circuit for linearizing analog-to-digital output is shown in FIG. 2, with an analog signal V.sub.i transmitted by input circuit 10 is applied to an input port of an analog-to-digital converter 12 controlled by a sampling signal V.sub.s, to provide digital data V.sub.d on an "N" bit data bus 14. An analog-to-digital linearizing memory 16 storing a look-up table of digital values, is coupled to bus 14 to receive the digital data V.sub.d, and to respond to the digital data V.sub.d by providing true linear digital values from the look-up table to digital data processing system DSP 20 via an "N" bit data bus 18. A microprocessor 22 is temporarily coupled between the output port of converter 12 and the input port of memory 16 via bus 14, to serve as a switch between bus 14 and a programming memory 24 containing a table of true linear digital values V.sub.t. A known test signal is applied to input circuit 10, and true linear digital values V.sub.t stored in programming memory 24, are then read into linearizing memory 16 to provide an accurate and reliable relation to a characteristic such as the amplitude of each step of the known test signal over the entire range of the known test signal.

55. 发明授权

US5113262A Video signal recording system enabling limited bandwidth recording and playback 失效
标题翻译：视频信号录制系统可实现有限带宽的录制和播放
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。

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