Apparatus for estimating distortion resulting from compressing digital data

摘要

Apparatus for analyzing distortion levels of samples which occur in data compression systems of the type that may be integrated into a data compression system or used as a stand alone analyzer. The apparatus includes a processor that is coupled to the data compression system to provide the distortion analyzing apparatus with necessary input bit allocation and power level data for each sample. Memory storage is coupled to the processor for supplying predetermined unique quantization error values corresponding to each transform coefficient representing samples of digital data in a frame of digital data to be compressed. The program in the processor calculates the estimated distortion value for each of the transform coefficients by multiplying power level values stored in the storage times the predetermined unique quantization corresponding to each transformed coefficient to provide estimated distortion values which may be summed over a frame of digital data to provide an average distortion level for a frame of digital data.