| 摘要 |
A method and apparatus for converting a resolution of a document to be transmitted at a high rate is disclosed. Horizontal converting section reduces or magnifies an input signal in accordance with the horizontal resolution specified by both a conversion magnification signal and a reduction/magnification mode signal in response to reference clock signals, and provides a horizontal conversion signal horizontally converted and a horizontal dot signal. Vertical converting section reduces or magnifies the horizontal conversion signal from the horizontal converting section in accordance with the vertical resolution specified by the conversion magnification signal on the basis of a line start signal, the conversion magnification signal and the mode signal, and provides a vertical conversion signal. Address generating section provides an address signal on the basis of the line start signal. Line memory section stores the horizontal line signal or outputs the stored horizontal line signal on the basis of the memory control signal from the vertical converting section and the address signal from the address generating section, and provides a read horizontal line signal to the vertical converting section. Both the vertical conversion signal whose resolution is converted and the horizontal dot signal are obtained from the input signal on the basis of the state transition sequences which accompany the conversion modes of a first clock generating circuit, a second clock generating circuit and a sequence control circuit. Therefore, the resolution conversion between any two of the G4 standard resolutions is executed at a high rate by the resolution converting apparatus having a simplified hardware configuration.
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