DIGITAL-TO-ANALOG CONVERTER

摘要

A digital-to-analog converter for producing less distorted output waveforms without the need for an increase in the operating speed of components. A D/A converter (1) comprises a memory (10), an address counter (12), a B spline function generator circuit (14), four sampling function generator circuits (16), three delay circuits (18), four amplifiers (20), and three summing circuits (22, 24 and 26). Four items of digital data supplied one after another in the predetermined time interval T are stored in the memory (10). The gain of each of the four amplifiers (20) is set according to the corresponding digital data. The four sampling function generator circuits (16) generate signal waveforms of the sampling function, which appear individually in points a time T away from one another. The signal waveforms are amplified in the amplifier (20) and summed to produce an analog signal associated with the interpolation value.