Burr-brown Corporation

Shigetoshi Nakao

Toshio Murota

Hideki Kanayama

Masayuki Ukawa

A characteristic tone in a delta-sigma analog-to-digital converter is shifted out of an audible pass band without diminishing dynamic range or signal-to-noise ratio thereof by operating the digital-to-analog converter to measure its offset voltage. If the amplitude of the measured offset voltage exceeds a predetermined value, no dither signal is applied to the input of the delta-sigma modulator. If the measured offset voltage is less than the predetermined value, a positive DC dither voltage is added to the input voltage of the delta-sigma modulator if the measured offset voltage is positive, or is subtracted if the measured offset voltage is negative.

Growing community of inventors

Komae, Japan

Shigetoshi Nakao