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公开(公告)号：US07933469B2
公开(公告)日：2011-04-26
申请号：US11846201
申请日：2007-08-28
IPC分类号： G06K9/40
CPC分类号： G06K9/38 , G06K9/4652 , H04N1/6027
摘要： Digital video contrast enhancement and skin tone correction by conversion to CIECAM02 color space with lightness transformation and a skin tone probability density function of hue and saturation.
摘要翻译： 数字视频对比度增强和肤色校正通过转换为CIECAM02颜色空间，具有亮度转换和色调和饱和度的肤色概率密度函数。
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公开(公告)号：US20070035667A1
公开(公告)日：2007-02-15
申请号：US11199661
申请日：2005-08-09
申请人： Feng Ying , Karl Renner , Weider Chang , Shereef Shehata , Viet Dinh , Xiaodong Wu , Walter Demmer
发明人： Feng Ying , Karl Renner , Weider Chang , Shereef Shehata , Viet Dinh , Xiaodong Wu , Walter Demmer
CPC分类号： H04H40/45
摘要： System and method for an all-digital audio receiver for a BTSC MTS audio signal or other composite signal that is FM modulated. A preferred embodiment comprises a digital FM demodulator for receiving an analog to digital quantized SIF signal and performing demodulation and outputting a composite audio signal, and a digital audio processor for decomposing the composite audio signal into at least the SAP, stereo and monaural signals for audio reproduction. In a preferred embodiment, the digital audio processor is a programmable digital signal processor. In a preferred embodiment, the digital FM demodulator and the digital audio processor are implemented as an integrated circuit. Methods for processing the audio signal using the digital processors of the invention are provided.
摘要翻译： 用于BTSC MTS音频信号或FM调制的其他复合信号的全数字音频接收机的系统和方法。 优选实施例包括用于接收模数数字量化SIF信号并执行解调和输出复合音频信号的数字FM解调器，以及用于将复合音频信号分解为至少SAP，用于音频的立体声和单声道信号的数字音频处理器 再生产。 在优选实施例中，数字音频处理器是可编程数字信号处理器。 在优选实施例中，数字FM解调器和数字音频处理器被实现为集成电路。 提供了使用本发明的数字处理器来处理音频信号的方法。
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公开(公告)号：US20060218213A1
公开(公告)日：2006-09-28
申请号：US11089178
申请日：2005-03-24
申请人： Shereef Shehata , Jason Meiners
发明人： Shereef Shehata , Jason Meiners
IPC分类号： G06F17/10
CPC分类号： H03H17/0227 , H03H17/04 , H03H17/06 , H03H2017/0072
摘要： A method for optimizing a digital filter that produces an output signal from samples of an input signal is configured with filter coefficients that are selected by a prescribed filter coefficient search. The filter coefficient search uses a pre-scaling constant or an additive constant with the filter coefficients and canonical signed digits to reduce filter cost or filter execution time. The coefficient search includes a precision for the filter coefficients and an allowable number of nonzero digits for each coefficient to produce a filter coefficient set with a reduced overall number of nonzero digits. The resulting filter can generally be implemented with substantially less integrated circuit die area than that obtainable with previous design approaches.
摘要翻译： 用于优化从输入信号的样本产生输出信号的数字滤波器的方法被配置有通过规定的滤波器系数搜索选择的滤波器系数。 滤波器系数搜索使用预定标常数或加法常数与滤波器系数和规范有符号数字来降低滤波器成本或滤波器执行时间。 系数搜索包括滤波器系数的精度和每个系数的允许非零数字数，以产生具有减少的非零数字总数的滤波器系数。 所得到的滤波器通常可以用比以前的设计方法可获得的小得多的集成电路管芯面积来实现。
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公开(公告)号：US20080056566A1
公开(公告)日：2008-03-06
申请号：US11846038
申请日：2007-08-28
申请人： Shereef Shehata , Weider Chang
发明人： Shereef Shehata , Weider Chang
IPC分类号： G06K9/00
CPC分类号： H04N5/57 , H04N21/4318 , H04N21/44008
摘要： Digital video contrast enhancement and skin tone correction by conversio to CIECAM02 color space with lightness transformation and a skin tone probability density function of hue and saturation.
摘要翻译： 数字视频对比度增强和肤色校正，通过对CIECAM02颜色空间进行亮度变换和色调和饱和度的肤色概率密度函数。
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公开(公告)号：US20060232709A1
公开(公告)日：2006-10-19
申请号：US11109290
申请日：2005-04-19
申请人： Karl Renner , Shereef Shehata , Jason Meiners , Weider Chang
发明人： Karl Renner , Shereef Shehata , Jason Meiners , Weider Chang
摘要： A system to reduce noise includes a noise measurement device that provides a measure of noise associated with a digital input video signal. A noise reduction filter provides a noise-reduced digital output video signal corresponding to the luma and chroma of the digital input video signal. The noise reduction filter has a parameter that varies on a pixel basis for the component of the digital input video signal as a function of the measure of noise. The range and sensitivity of the noise reduction can be user programmable.
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公开(公告)号：US07532257B2
公开(公告)日：2009-05-12
申请号：US11220488
申请日：2005-09-07
IPC分类号： H04N5/455
CPC分类号： H04N5/455 , H04B1/1027 , H04B1/123 , H04B10/85 , H04N9/646 , H04N21/4382 , H04N21/6118
摘要： Base band compensation for an IF stage in a television provides significant advantages over compensation applied to the composite signal. Each base band color difference signal is filtered to obtain cross-talk elements, which are then applied to the opposite channel to eliminate the cross-talk components from the color difference signal channels. The compensation technique is applicable to IF stages generally, including those based on SAW filters. High and low gain compensation of the cross-talk compensated signals may also be performed to reduce distortion in the compensated signals. The base band compensation tends to reduce or eliminate visual artifacts in a television image, especially where sharp contrast transitions occur in the image.
摘要翻译： 电视中的IF级的基带补偿相对于复合信号的补偿提供了显着的优点。 对每个基带色差信号进行滤波以获得串扰元件，然后将它们应用于相反的通道以消除色差信号通道中的串扰分量。 补偿技术一般适用于IF级，包括基于SAW滤波器的IF级。 也可以执行串扰补偿信号的高和低增益补偿以减少补偿信号中的失真。 基带补偿趋向于减少或消除电视图像中的视觉伪影，特别是在图像中发生尖锐的对比度转换时。
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公开(公告)号：US07468763B2
公开(公告)日：2008-12-23
申请号：US11199661
申请日：2005-08-09
申请人： Feng Ying , Karl Hertzian Renner , Weider Peter Chang , Shereef Shehata , Viet Dinh , Xiaodong Wu , Walter Heinrich Demmer
发明人： Feng Ying , Karl Hertzian Renner , Weider Peter Chang , Shereef Shehata , Viet Dinh , Xiaodong Wu , Walter Heinrich Demmer
CPC分类号： H04H40/45
摘要： System and method for an all-digital audio receiver for a BTSC MTS audio signal or other composite signal that is FM modulated. A preferred embodiment comprises a digital FM demodulator for receiving an analog to digital quantized SIF signal and performing demodulation and outputting a composite audio signal, and a digital audio processor for decomposing the composite audio signal into at least the SAP, stereo and monaural signals for audio reproduction. In a preferred embodiment, the digital audio processor is a programmable digital signal processor. In a preferred embodiment, the digital FM demodulator and the digital audio processor are implemented as an integrated circuit. Methods for processing the audio signal using the digital processors of the invention are provided.
摘要翻译： 用于BTSC MTS音频信号或FM调制的其他复合信号的全数字音频接收机的系统和方法。 优选实施例包括用于接收模数数字量化SIF信号并执行解调和输出复合音频信号的数字FM解调器，以及用于将复合音频信号分解为至少SAP，用于音频的立体声和单声道信号的数字音频处理器 再生产。 在优选实施例中，数字音频处理器是可编程数字信号处理器。 在优选实施例中，数字FM解调器和数字音频处理器被实现为集成电路。 提供了使用本发明的数字处理器来处理音频信号的方法。
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公开(公告)号：US20060242220A1
公开(公告)日：2006-10-26
申请号：US11110032
申请日：2005-04-20
申请人： Shereef Shehata , Feng Ying , Karl Renner
发明人： Shereef Shehata , Feng Ying , Karl Renner
IPC分类号： G06F7/52
CPC分类号： G06F7/535 , G06F2207/5354 , G06F2207/5355
摘要： Systems and methods are provided for dividing two digital values. A look-up table provides a first output value in response to a value of an input signal. The first output value corresponds to a first estimate of a reciprocal for the value of the input signal. An approximation component provides a second output value corresponding to a second estimate of the reciprocal value for the value of the input signal as a function of the first output value and the value of the input signal. The look-up table is configured to provide the first output value within a predetermined error sufficient to enable the approximation component to improve the first estimate within a second predetermined error by the approximation component employing a single iteration of the function of the first output value and the value of the input signal.
摘要翻译： 提供了系统和方法来分割两个数字值。 查找表提供响应于输入信号的值的第一输出值。 第一输出值对应于输入信号的值的倒数的第一估计。 近似分量提供对应于作为第一输出值和输入信号的值的函数的输入信号的值的倒数值的第二估计值的第二输出值。 查找表被配置为提供在预定误差内的第一输出值，足以使近似分量通过采用第一输出值的函数的单次迭代的近似分量来改善第二预定误差内的第一估计，以及 输入信号的值。
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9.发明授权Pipelined analog to digital converter using digital mismatch noise cancellation 有权使用数字失配噪声消除的流水线模数转换器公开(公告)号：US06456223B1
公开(公告)日：2002-09-24
申请号：US09715228
申请日：2000-11-17
申请人： Paul C. Yu , Shereef Shehata , Ranjit Gharpurey
发明人： Paul C. Yu , Shereef Shehata , Ranjit Gharpurey
IPC分类号： H03M138
CPC分类号： H03M1/08 , H03M1/0673 , H03M1/168
摘要： In a pipelined analog-to-digital converter (ADC) having an analog input signal and a digital output signal, and having a plurality of pipelined stages, each such stage having an analog input, an analog output comprising a residue voltage, and a digital output, the stage including a digital-to-analog converter substage having a plurality of capacitors and which are used in a sample-and-hold function and shuffled according to a predetermined procedure, a method for reducing noise generated from the shuffling when the capacitors are mismatched. The method includes the following steps. First, an estimation model is provided of the noise generated from the shuffling. The estimation model includes factors corresponding to mismatches of the capacitors. Mismatches among capacitors in the stage are estimated, based on the monitoring of an output parameter of the stage. A cancellation factor is generated by applying the mismatch estimations to the estimation model. Finally, the cancellation factor is subtracted from an ADC output to substantially reduce and/or effectively cancel the mismatch noise.
摘要翻译： 在具有模拟输入信号和数字输出信号并且具有多个流水线级的流水线模数转换器（ADC）中，每个这样的级具有模拟输入，包括残余电压的模拟输出和数字 输出，所述级包括具有多个电容器的数模转换器子级，其根据预定的过程用于采样保持功能并进行混洗;一种用于在电容器中减少由混洗产生的噪声的方法 不匹配。 该方法包括以下步骤。 首先，提供从混洗产生的噪声的估计模型。 估计模型包括与电容器不匹配相对应的因素。 基于对该阶段的输出参数的监视来估计阶段中的电容器之间的不匹配。 通过将不匹配估计应用于估计模型来生成消除因子。 最后，从ADC输出中减去消除因子，以显着减少和/或有效地消除失配噪声。
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公开(公告)号：US09049408B2
公开(公告)日：2015-06-02
申请号：US11849456
申请日：2007-09-04
CPC分类号： H04N9/643 , G09G5/02 , G09G2320/0242 , H04N9/64 , H04N9/646 , H04N9/67 , H04N9/68 , H04N9/73
摘要： A method of color processing determines whether a pixel color is within at least one range of predetermined colors corresponding to a viewer expected color. If so, the method altering the pixel color to better approximate the viewer expected color. For detection of skin tones determining whether the pixel color is within a range of predetermined colors includes discounting an illuminant of the pixel color. The viewer expected colors are preferably skin tone, grass green and sky blue. The saturation level of grass green and sky blue are enhanced and that of skin tones are suppressed. The saturation s is limited based upon lightness J and hue h to convert to an allowable RGB color format range.
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