Niigata Seimitsu Co., Ltd.

Yukio Koyanagi

Kazuo Toraichi

An image processing circuit capable of carrying out high-speed processing and improving the horizontal and vertical resolutions even with its simple structure. The pixel values a to i of a total of nine pixels, three pixels in the horizontal direction along a scanning line by three pixels in the vertical direction in which the line and adjacent lines are abreast, are extracted by a pixel value extracting section. The pixel values Ato Aof four pixels Qto Qgenerated additionally around the center pixel Pare determined by calculation by a pixel value calculation section. These pixel values are outputted in units of one scanning line by correlating them with two scanning lines by a pixel value output section.

Image processing circuit

An interpolation circuit capable of performing interpolation operation with a simple constitution. A 16-times oversampling from discrete data is performed by D frip-frops. A first convolution operation is performed by D frip-fropsthroughand an adder, on the result of which a second convolution operation is performed by D frip-fropsthroughand an adder. Data interpolated along a quadratic function curve interpolating the discrete data is obtained from the adder

Interpolation circuit

A digital-to-analog converter for generating output waveforms with less distortion without the need for high-speed components. The digital-to-analog converter comprises a D/A converter, four voltage holding sections, four step function waveform generators, a voltage summing section, two integrators and a timing controller. The voltages corresponding to four sequential digital data inputs are held in the voltage holding sections, respectively, and the step function generators generate step function waveforms at the voltage levels corresponding to the held voltages. The voltage summing section combines the step function waveforms generated in the step function waveform generators, and two integrators integrate this combined waveform two times, thus producing a continuous analog voltage composed of the input digital data.

Digital-to-analog converter with plural voltage holding sections, plural step function generators, voltage summing section and integrator

A data interpolating method capable of reducing an operation volume without the occurrence of a truncation error. Each of four step function generators generates a preset step function. Multipliers each multiply step function values output from relative step function generators by discrete data values held cyclically in data holding sections. An adding unit adds together the multiplied results output from respective multipliers in response to the respective four discrete data and the added values is integrated twice by integrators, an interpolation value between the discrete data being then output from the second-stage integrator.

Data interpolation method

A digital-to-analog converter for generating output waveforms with less distortion without the need for high-speed components. The digital-to-analog converter comprises four data holding sections, four step function generators, an adding section, a D/A converter, two integrators and a timing controller. Four digital data successively inputs are held in the data holding sections, respectively, and the step function generators generate step function whose values corresponding to the held data. The adding section sums the step functions generated in the step function generators, and the D/A converter generates the analog stepwise voltage corresponding to the summed value. The two integrators integrate this combined waveform two times, thus producing a continuous analog voltage that connects the input digital data smoothly.

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Jouetsu, Japan

Yukio Koyanagi