FUNCTION GENERATING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To reduce the error of an output signal level to an input signal level by allowing aΔΣmodulator to output probabilistically plural digital signals according to an analog input signal level so as to reduce the scale of a digital decoder. SOLUTION: TheΔΣmodulator 1 probabilistically outputs plural N-bit digital signal according to the analog input signal level. Next the digital decoder 2 is provided with the hard wired recorder of N-bit input and M-bit output and the memory of an M-bit word length with an N-bit address and outputs an M-bit digital signals. DA converter 3 converts this to an analog signal. A next low-pass filter 4 is provided with an active filter and a passive filter consisting of a resistor and a capacitor to allow prescribed low-pass components to pass. As the plural digital signals are outputted probabilistically according to the analog input signal level like this, a digital decoder scale is small and the error of the output signal is little with respect to an input level.