Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Reexamination Certificate
2005-04-19
2005-04-19
Woo, Stella (Department: 2643)
Electrical audio signal processing systems and devices
Including amplitude or volume control
With amplitude compression/expansion
C381S107000
Reexamination Certificate
active
06882735
ABSTRACT:
Computer processor method and apparatus for creating an audio multiplier control signal for controlling the dynamic range of a recorded audio work. The technique includes determining an envelope of the amplitude of amplitude versus time values the audio signal, and then determining, for values of the envelope, respective minimum and maximum multiplication factors (MinMF and MaxMF) that can be multiplied times the values such that the products are above a predetermined minimum amplitude and below a predetermined maximum amplitude of the dynamic range. Then a control signal function of amplitude versus time is created such that all values of the control signal function at particular times are between respective MinMF and MaxMF values for the times, and such that segments of the control signal function have reduced slopes. Also disclosed is a method of creating a reduced-slope series of line segments passing through a pair of Max and Min limiting functions specifying y values with respect to a variable x.
REFERENCES:
patent: 4071695 (1978-01-01), Flanagan et al.
patent: 4093831 (1978-06-01), Sharp et al.
patent: 4398061 (1983-08-01), McMann, Jr.
patent: 4562591 (1985-12-01), Stikvoort
patent: 4661981 (1987-04-01), Henrickson et al.
patent: 4696040 (1987-09-01), Doddington et al.
patent: 4864627 (1989-09-01), Dugan
patent: 4935963 (1990-06-01), Jain
patent: 5278912 (1994-01-01), Waldhauer
patent: 5488668 (1996-01-01), Waldhauer
patent: 5706357 (1998-01-01), Yang
patent: 5784476 (1998-07-01), Bird
patent: 5822018 (1998-10-01), Farmer
patent: 5828755 (1998-10-01), Feremans et al.
patent: 5832444 (1998-11-01), Schmidt
patent: 5892834 (1999-04-01), Smart et al.
patent: 5896458 (1999-04-01), Werrbach
patent: 5923767 (1999-07-01), Frindle et al.
patent: 5923768 (1999-07-01), Frindle et al.
patent: 6088461 (2000-07-01), Lin et al.
patent: 6107879 (2000-08-01), Hoshino et al.
patent: 6473662 (2002-10-01), Lubbe et al.
Cormen,Introduction to Algorithms, ISBN 0-07-013143-0, pp. 898-907.
Autodesk, Inc.
Gates & Cooper LLP
Woo Stella
LandOfFree
Dynamic range compression of an audio signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dynamic range compression of an audio signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic range compression of an audio signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3379953