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    • 2. 发明授权
    • Digital time base corrector
    • 数字时基校正器
    • US5497200A
    • 1996-03-05
    • US357750
    • 1994-12-16
    • Hiroshi OtakiMasahiro Nakajima
    • Hiroshi OtakiMasahiro Nakajima
    • H04N5/85H04N5/956H04N9/896H04N5/95
    • H04N5/956H04N5/85
    • A digital time base corrector, when using a memory whose storage capacity is reduced to a value of about 1H of the video signal, can maintain an interleave relation between a luminance signal and a color signal of a video signal even when the writing operation into a memory is delayed by a jitter included in the demodulated video signal. When the read address is advanced from the write address in each of an image data memory and a subcarrier phase memory in one horizontal scan period, a discrepancy occurs between the polarity data read out from the subcarrier phase memory and the proper polarity data held in latch means. When such a discrepancy is detected, the color phase of the read-out image data is inverted. In starting the data reading operation for a new horizontal scan period, if it is detected that the operating mode has not shifted to the data writing operation for the new horizontal scan period, the color phase of the read-out image data is inverted for the new horizontal scan period.
    • 数字时基校正器当使用存储容量减小到视频信号的大约1H的值的存储器时,即使当将写入操作转换为视频信号时,也可以保持亮度信号和视频信号的颜色信号之间的交织关系 存储器被包括在解调视频信号中的抖动延迟。 当在一个水平扫描周期中读取地址从每个图像数据存储器和副载波相位存储器中的写入地址提前时,在从副载波相位存储器读出的极性数据与保持在锁存器中的合适极性数据之间出现差异 手段。 当检测到这种差异时,读出的图像数据的颜色相位被反转。 在开始新的水平扫描周期的数据读取操作时,如果检测到操作模式未移动到用于新的水平扫描周期的数据写入操作,则读出的图像数据的颜色相位反转为 新的水平扫描周期。
    • 3. 发明授权
    • Digital time base corrector with dropout compensating function
    • 具有压差补偿功能的数字时基校正器
    • US5471250A
    • 1995-11-28
    • US357861
    • 1994-12-16
    • Hiroshi OtakiMasahiro Nakajima
    • Hiroshi OtakiMasahiro Nakajima
    • H04N5/956H04N5/932H04N9/88H04N9/885H04N9/896H04N5/94H04N5/95
    • H04N5/932H04N9/885H04N9/896
    • A digital time base corrector reduces the capacity of a memory to approximately a 1 H of image data while maintains the interleave relationship between a luminance signal and a chrominance signal of a video signal. Polarity data indicating the polarity of a burst signal is generated every 1 H, and a latch circuit is provided for holding and outputting the polarity data during a period of reading image data and polarity data from an image data memory and a sub-carrier phase memory, corresponding to the 1 H in which the polarity data was generated. When dropout occurs in a video signal, the image data and the polarity data are inhibited from being written into the image data memory and the sub-carrier phase memory. When discrepancy is detected between read polarity data and polarity data held in the latch circuit, the color phase of the read image data is inverted.
    • 数字时基校正器将存储器的容量减小到大约1 H的图像数据,同时保持视频信号的亮度信号和色度信号之间的交织关系。 每1H产生指示突发信号的极性的极性数据,并且提供锁存电路用于在从图像数据存储器和副载波相位存储器读取图像数据和极性数据的时段期间保持和输出极性数据 ,对应于其中产生极性数据的1H。 当在视频信号中发生压差时,禁止图像数据和极性数据被写入到图像数据存储器和副载波相位存储器中。 当读取极性数据和保持在锁存电路中的极性数据之间检测到差异时,读取的图像数据的颜色相位被反转。