| 摘要 |
PURPOSE:To remarkably reduce labor required for an initialization by providing a digitized finely adjusting circuit. CONSTITUTION:At the time of finely adjusting, an initializing switch 8 is turned on and all corrected values are initialized, thereafter, a tap to be corrected is selected by a Samuel switch 5 and a fine adjustment is executed by an increasing switch 6 or a reducing switch 7 to the arithmetic result of the selected tap. The corrected value at this time is stored in an EEPROM 9 and similar correction is sequentially carried out to other taps. According to the use of the digitized finely adjusting circuit, a tap coefficient value outputted from an arithmetic circuit 2 includes the corrected value and is directly supplied to a D/A converter 3. Thereby, a labor required for the initialization is reduced.
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