Method and Apparatus for Distortion of Audio Signals and Emulation of Vacuum Tube Amplifiers
OwnerMarc Nicholas Galloinventor
Life of this patent
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Abstract
A method for digitally processing audio signals to emulate the effects of vacuum tube amplifiers and preamplifiers, musical instrument amplification systems, and distortion effects. By use of an implicit numerical method to estimate the response of a parametrically-controlled non-linear transfer function, non-linear filters, and feedback elements, the dynamic behavior and distortion effects of tube amplification stages are simulated. This provides the capability to reproduce the desired sounds of vintage and modern tube amplifier systems and effects with the conveniences and control associated with digital signal processing systems and software.
Claims19
A signal processing method using a non-linear transfer function defined by coefficients, k1, k2, k3, and k4, two boundaries, a and b, gain parameter, g, and two offset parameters, d and o, to produce the output, y, from the input, x, given by
- f
-
- (
- x
- )
- =
- {
- (
- k
- 1
- +
- gx
- )
- (
- k
- 2
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- gx
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- -
- o
- ,
- x
- <
- a
- g
- gx
- +
- d
- -
- o
- ,
- a
- g
- ≤
- x
- ≤
- b
- g
- (
- gx
- -
- k
- 3
- )
- (
- gx
- +
- k
- 4
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- -
- o
- ,
- b
- g
- <
- x
Dependencies are inferred from the claim text.