D/A converter for a digital signal after non-linear A/D conversion, audio signal processing circuit and liquid crystal display device including the same

摘要

A D/A converter inputted with non-linear conversion digital data such as a digital signal encoded according to a mu-Law system or the like as it is to convert into an analog signal. A D/A converter is of resistor string type, in which a resistance value of each of resistors of a resistor string is not set uniform but weighted so that a non-linear relationship between an encoded input digital signal and an output analog signal is converted into a linear relationship. Consequently, a decode circuit for converting non-linear conversion digital data into linear conversion digital data is not required.