D/A converter noise reduction system

Year	Description
1994	Invention patented by Peter A. Lam on April 27th, 1994. Abstract: An apparatus for improving the quality of an analog signal reproduced from digital samples by limiting the amount of sampling and quantization noise present within reproduced analog signals. The apparatus is comprised of a D/A converter coupled to an interpolator processing original digital samples operating at a reproduction rate greater than the original sampling frequency and at a digital resolution greater than or equal to the original digital samples to generate digital pseudo-samples. The processed digital pseudo-samples are then provided to the D/A converter at the reproduction rate. As a consequence of the increase in the reproduction rate, sampling noise is moved further away in the frequency domain from the original analog signal, thus eliminating or reducing the requirement for a low-pass filter. Due to the increased number of samples and the increased digital resolution of the samples, the reproduction errors are further minimized.
Source: selected by the editor from original sources.

Invention: D/A converter noise reduction system