Method and apparatus for evaluating the quality of audio and/or video transfer characteristics of a device upon which, or through which, audio and/or video information is contained, or passes, respectively. Both method and apparatus concern the evaluation of the quality of information transfer in the...http://www.google.fr/patents/US4746991?utm_source=gb-gplus-shareBrevet US4746991 - Recording characteristic evaluation of a recording medium with a time sequence of test signals
Recording characteristic evaluation of a recording medium with a time ...
