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...http://www.google.com.tw/patents/US4965830?utm_source=gb-gplus-share專利 US4965830 - Apparatus for estimating distortion resulting from compressing digital data
