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    • 5. 发明授权
    • Digital/analog converter and image processing apparatus using the same
    • 数字/模拟转换器和使用其的图像处理装置
    • US5272544A
    • 1993-12-21
    • US704201
    • 1991-05-23
    • Masanori SakaiKazuhiko HirookaMasao Watanabe
    • Masanori SakaiKazuhiko HirookaMasao Watanabe
    • H04N1/405H04N1/40
    • H04N1/4056
    • An image processing apparatus having: an unit for receiving a digital multi-value pixel data; a D/A converter for converting the inputted multi-value pixel data into an analog signal; a generator for generating an analog pattern signal synchronously with an input of the digital multi-value pixel data; a sample/hold circuit for sampling and holding the analog signal converted by the D/A converter, synchronously with an input of the digital multi-value pixel data; and a binarizing circuit for generating a binarized pulse signal having a width corresponding to the value of the digital multi-value pixel data by comparing the analog signal held the said sample/hold circuit with the pattern signal generated by the pattern signal generator. A D/A converter having: a digital/analog conversion unit for converting a digital signal into an analog signal at the same speed as the period of generating the digital signal; and a sample/hold circuit for holding and outputting the analog signal converted by the digital/analog conversion unit, synchronously with the period of generating the digital signal.
    • 一种图像处理装置,具有:用于接收数字多值像素数据的单元; D / A转换器,用于将输入的多值像素数据转换为模拟信号; 用于与数字多值像素数据的输入同步地产生模拟图形信号的发生器; 采样/保持电路,用于与数字多值像素数据的输入同步地采样和保持由D / A转换器转换的模拟信号; 以及二值化电路,用于通过将保持所述采样/保持电路的模拟信号与由模式信号发生器产生的模式信号进行比较来产生具有与数字多值像素数据的值对应的宽度的二值化脉冲信号。 一种D / A转换器,具有:数字/模拟转换单元,用于以与生成数字信号的周期相同的速度将数字信号转换为模拟信号; 以及采样/保持电路,用于与产生数字信号的周期同步地保持和输出由数字/模拟转换单元转换的模拟信号。