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公开(公告)号：US4675735A
公开(公告)日：1987-06-23
申请号：US772419
申请日：1985-09-04
CPC分类号： H04N9/888
摘要： Concealing errors in a digital television signal, which has a plurality of component sample values corresponding respectively to sample positions along a horizontal scan line of a television picture made up of a plurality of scan lines, in respect of each sample value which is in error, by calculating a first concealment accuracy by determining the difference between two immediately adjacent sample values both in the scan line immediately preceding or following the scan line which the error sample is in, and one of which sample values is immediately adjacent to the error sample, calculating a second concealment accuracy by determining the difference between two immediately adjacent sample values both in the vertical line immediately preceding or following the vertical line which the error sample is in, and one of which sample values is immediately adjacent to the error sample, selecting from the available concealment accuracies a preferred direction of the television picture for concealing the error sample, calculating a corrected value of the error sample using available sample values disposed along the preferred direction, and substituting the corrected sample value for the error sample so as to conceal the error.
摘要翻译： 数字电视信号中隐藏误差，该数字电视信号具有分别对应于由多个扫描线构成的电视图像的水平扫描线的采样位置的多个分量采样值，关于每个错误的采样值， 通过在误差样本所在的扫描线之前或之后的扫描线中确定两个紧邻的样本值之间的差异，并且其中一个采样值紧邻于误差样本，计算第一隐藏精度，计算 通过确定在错误样本所在的垂直线之前或之后的垂直线中的两个紧邻的样本值之间的差异，并且其中一个样本值紧邻于误差样本，从第二隐藏精度中选择 可用的隐藏精度是电视图像的优选方向 使用误差样本，使用沿优选方向布置的可用样本值来计算误差样本的校正值，并将校正后的样本值替换为误差样本以隐藏误差。
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2.发明授权Recording and reproducing digital audio signals formed into groups of varying lengths 失效记录和再现形成为不同长度的组的数字音频信号
公开(公告)号：US4660103A
公开(公告)日：1987-04-21
申请号：US772451
申请日：1985-09-04
CPC分类号： H04N5/928 , G11B20/10527 , H04N19/152 , H04N19/50
摘要： A method of recording a digital audio signal in association with a digital video signal which is to be recorded in oblique tracks on a magnetic tape using a rotary head the rotational frequency of which is locked to the digital video signal, comprises the steps of assembling incoming audio data words which correspond to successive samples of an audio signal into groups nominally of N audio data words where N is the number of audio samples corresponding to the digital video signal to be recorded in one oblique track, allowing the number of audio data words in each group to vary preferably over the range N-1 to N+1 to maintain synchronism of the audio signal with the rotational frequency of the rotary head, coding the audio data words into error-correcting blocks for recording by the rotary head, and associating with each error-correcting block a status code for use on reproduction and which indicates whether the number of audio data words in the corresponding group is N-1, or N+1.
摘要翻译： 使用旋转头被锁定在数字视频信号上的旋转磁头将数字音频信号与要记录在磁带上的倾斜磁道中的数字视频信号进行记录的方法包括以下步骤：组合传入 对应于音频信号的连续采样的音频数据字，其名义上为N个音频数据字，其中N是与要记录在一个倾斜轨道中的数字视频信号相对应的音频样本的数量，允许音频数据字数 每个组优选地在N-1到N + 1的范围内变化，以保持音频信号与旋转磁头的旋转频率的同步，将音频数据字编码成用于由旋转磁头记录的纠错块， 每个错误校正块是用于再现的状态码，并且指示对应组中的音频数据字的数量是N-1还是N + 1。
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公开(公告)号：US4656514A
公开(公告)日：1987-04-07
申请号：US767646
申请日：1985-08-20
CPC分类号： H04N5/945
摘要： Apparatus for concealing errors in a digital television signal comprises delay elements for deriving a current sample value and a first group of the sample values spatially closest to the current sample value in the same frame of the television signal and delay elements for deriving from the preceding frame of the television signal a delayed sample value corresponding in position to the current sample value and a second group of sample values respectively corresponding in position to the sample values. The current sample value and the delayed sample value are checked for error, and subtractors check pairs of sample values corresponding in position in the current and preceding frames of the television signal for error, derive a measure of the difference in the levels of the sample values in each pair, and combine the results of these checks to provide an output signal which is a measure of the number of the errors and of the sum of the differences. A threshold device checks the output signal against a predetermined threshold level corresponding to an acceptably small number of errors and a relative low degree of movement in the part of a television picture corresponding to the groups of sample values, and a selector is operative, if the sample value is in error, the delayed sample value in not in error, and the output signal is below the predetermined level, to replace the current sample value by the delayed sample value for supply to an output, and, in all other cases, to supply the current sample value to the output.
摘要翻译： 用于隐藏数字电视信号中的错误的装置包括用于导出当前采样值的延迟元件和在电视信号的相同帧中空间上最接近当前采样值的采样值的第一组以及从前一帧导出的延迟元件 电视信号中的位置对应于当前采样值的延迟采样值和分别对应于采样值的位置的第二组采样值。 对当前采样值和延迟采样值进行错误检查，并且减法器检查对应于电视信号当前帧和前一帧中的位置的采样值对，以得出误差的电平差的度量 在每对中，并且将这些检查的结果组合以提供输出信号，其是误差数量和差异之和的量度。 阈值装置根据对应于可接受的少量错误的预定阈值水平检查输出信号，并且在与采样值组对应的电视图像的一部分中相对较低的运动程度，并且选择器可操作，如果 采样值误差，延迟采样值不出错，输出信号低于预定值，将当前采样值替换为延迟采样值供给输出，而在其他情况下， 将当前采样值提供给输出。
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