Patent ID: 6882735
Filing Date: 2005-04-19
Classification: H03G

Abstract:
1. A computer processor method of creating an audio multiplier control signal for controlling the dynamic range of recorded audio work including an audio signal having an amplitude that varies over the time period of the work, said method comprising receiving amplitude versus time values for said audio signal, determining an envelope of the amplitude of said audio signal using a convex hull calculation, determining, for values of said envelope, respective minimum and maximum multiplication factors (MinMF and MaxMF) that can be multiplied times said values such that the products are above a predetermined minimum amplitude and below a predetermined maximum amplitude of said dynamic range, and creating a control signal function of amplitude versus time such that all values of said control signal function at particular times are between respective MinMF and MaxMF values for said times, and such that segments of said control signal function have reduced slopes.