| 摘要 |
PURPOSE:To remove sound generated from a carriage at the time of control of a speed by converting a sine wavelike position signal into a triangular wavelike position signal. CONSTITUTION:A position signal (p) is converted into a sine bit (d) and 8-bit digital signal a0-a7 with the position signal (p) and a clock (h) formed by an oscillation circuit 202 by means of a 8-bit+sine bit.A/D converter 200. A memory 201 inputs address a0-a7, and converts them into 8-bit digital signals b0-b7 corresponding to bit conversion. Then, a position signal p' is output as an analog signal by the sine bit (d) and the 8-bit digital signals b0-b7 by means by a D/A converter 203, and a sine wavelike position signal (p) is converted to a triangular wavelike position signal p'. An output signal n' of an inverted output of the position signal (p) is output by an inverting amplifier 12 having 1 of an amplification factor. The position signals p', n' are replaced with the inputs of the position signals p, n thereby to prevent a sound from a carriage at the time of control of a speed without ripple at a speed signal (v). |
