Adaptive rounder for video signals
AssigneeThe Grass Valley Group, Inc.
InventorsJohn Abt, James A. Delwiche
Life of this patent
Estimating the term…
Abstract
An adaptive rounder for avoiding truncation errors for digital video signal has a dither source that is modified by the bits of an integer portion of an input digital signal corresponding to the video signal. A dither signal from the dither source has a number of bits equal to a fractional portion of the input digital signal. The dither signal is added to the input digital signal and the result is truncated to produce an output digital signal having a number of bits equal to the integer portion.
Claims6
An adaptive rounder for reducing the number of bits between an input digital signal and an output digital signal comprising:
- means for generating a dither signal having a number of bits equal to the difference in the number of bits between the input and output digital signals, the dither signal being a function of a modifier input signal derived from the input digital signal;
- and
- means for combining the dither signal with the input digital signal to produce the output digital signal.
Dependencies are inferred from the claim text.