Fecha de publicación: 07/07/1998 Fuente: Wipo "digitalization" An analog/digital and digital/analog converting apparatus includes an analog/digital converter circuit for converting an input analog signal into a digital signal, a digital/analog converter circuit for converting the digital signal converted by the analog/digital converter circuit into an analog signal to obtain an output signal, a level-control variable resistor for controlling a level of a signal to be supplied to the analog/digital converter circuit, and an adjustment circuit for changing a pulse height value or a current value of the output signal so that the levels of the input signal and the output signal are the same by applying a predetermined DC voltage based on the change of the level-control variable resistor and for supplying a control signal used for controlling the level of the output signal to the digital/analog converter circuit.