| 摘要 |
PURPOSE:To vary characteristics to a desired function easily without changing any circuit element by reading one of digital coefficient codes out of a storage circuit in accordance with the level of an input signal. CONSTITUTION:For example, the coefficient code of a reference voltage corresponding to the extent DIF of movement on a magnetic disk in the form of the number of tracks is stored in an ROM54 and a track-number movement extent signal SDIF of a head is supplied to the ROM54 to output a digital code signal COD corresponding to the level of the signal. This output is inputted to one terminal 53b of an AD converter 53 through an AD converter 55 and a reference voltage setting circuit 56. Said signal SDIF is inputted from a setter 57 to the other terminal 53a of the AD converter 53. The output S14 of the AD converter 53 is inputted to a level shifting circuit 58, which is applied with an offset voltage to output a signal S15. |
