Method of manufacturing phonograph records

Claim 1

METHOD OF MAKING A PHONOGRAPH RECORD MASTER DISC USING CONVENTIONAL RECORD MAKING EQUIPMENT WHICH INHERENTLY PRODUCES DISTORTIONS DUE TO THE PROCESS OF RECORD MANUFACTURE INCLUDING PLAYBACK, SAID METHOD COMPRISING THE STEPS OF (A) RECORDING THE TRUE AUDIO SIGNALS ON HIGH-QUALITY TAPE, (B) PLAYING SAID TAPE SIGNALS INTO SAID EQUIPMENT TO PRODUCE A FIRST MASTER CUT DISC, (C) MAKING A PRELIMINARY DISC RECORD FROM SAID FIRST MASTER DISC USING THE USUAL PROCEDURE WITH SAID RECORD CONTAINING SAID DISTORTIONS DUE TO SAID EQUIPMENT, (D) PLAYING SAID PRELIMINARY DISC RECORD AND SAID TAPE RECORD IN ACCURATE SYNCHRONISM, USING STANDARD PLAYBACK EQUIPMENT, TO PROVIDE PRELIMINARY RECORD SIGNAL AND SAID RECORDED TRUE AUDIO SIGNALS, AND DIFFERENTIALLY MIXING SAID SYNCHRONIZED SIGNALS IN SUCH MANNER AS TO PRODUCE A RESULTANT SIGNAL WHICH INCLUDES A TRUE AUDIO SIGNAL COMBINED WITH CORRECTION SIGNAL COMPONENTS EQUAL AND OPPOSITE TO THE DIFFERENCES BETWEEN SAID PRELIMINARY SIGNALS AND THE TRUE AUDIO SIGNALS, (E) PLAYING SAID NEW SIGNAL INTO SAID CONVENTIONAL RECORD MAKING EQUIPMENT TO PRODUCE A DISTORTIONCOMPENSATING MASTER CUT DISC.