Post-conversion system for an analog-to-digital converter which sets an added bit of resolution if an intermediate sample is within a threshold

摘要

Post processing of the converted digital bits from an ADC to provide one or more additional bits of resolution. The additional bits of resolution will be accurate for data which is locally correlated, such as image data. For a particular digital sample, a curve (such as a straight line) is fitted through adjacent samples to determine an expected value for the current sample. The actual digital sample is compared to the expected value to determine whether it is within a threshold of the expected value. The value of an additional bit of resolution is set based upon whether the sample is within the threshold.