Audio distortion correction for a parametric reproduction system
First Claim
1. A method of distortion reduction in a non-linear audio system, comprising the steps of:
- defining a non-linear system transfer function which relates a system electronic input signal with a system acoustic output and is valid over a range of input amplitude levels corresponding with at least a portion of a range of acoustic output sound pressure levels in which the system acoustic output is in a transition between non-saturated and saturated conditions in a medium in which the system acoustic output of the non-linear audio system is broadcast;
creating a preprocessing transfer function which is the solved inverse of the non-linear system transfer function; and
applying the preprocessing transfer function to the system electronic input signal to form a pre-processed electronic input signal, wherein the pre-processed electronic input signal is configured to provide a modified system acoustic output having a reduced level of harmonic distortion relative to the system acoustic output;
wherein the preprocessing transfer function is of the form;
14 Assignments
0 Petitions
Accused Products
Abstract
A system and methods for distortion reduction in a non-linear audio system are disclosed. A method includes the operation of defining a non-linear system transfer function which relates a system electronic input signal with a system acoustic output over a range in which the system acoustic output is in a transition between non-saturated and saturated conditions in a medium in which the system acoustic output of the non-linear audio system is broadcast. A preprocessing transfer function is created that is the inverse of the non-linear system transfer function. The preprocessing transfer function is applied to the system electronic input signal to reduce the level of harmonic distortion at the system acoustic output.
-
Citations
8 Claims
-
1. A method of distortion reduction in a non-linear audio system, comprising the steps of:
-
defining a non-linear system transfer function which relates a system electronic input signal with a system acoustic output and is valid over a range of input amplitude levels corresponding with at least a portion of a range of acoustic output sound pressure levels in which the system acoustic output is in a transition between non-saturated and saturated conditions in a medium in which the system acoustic output of the non-linear audio system is broadcast; creating a preprocessing transfer function which is the solved inverse of the non-linear system transfer function; and applying the preprocessing transfer function to the system electronic input signal to form a pre-processed electronic input signal, wherein the pre-processed electronic input signal is configured to provide a modified system acoustic output having a reduced level of harmonic distortion relative to the system acoustic output; wherein the preprocessing transfer function is of the form; - View Dependent Claims (2, 3, 4)
-
-
5. A signal preprocessor system for reducing distortion of an input audio signal in the output of a non-linear audio system, including:
-
an input line configured to receive an input electronic audio signal; an output line configured to output a preprocessed electronic audio signal to the non-linear audio system; a processor disposed between and connected to the input line and output line, and programmed to implement a preprocessing transfer function that is the solved inverse of a non-linear system transfer function defining distortion of the input electronic audio signal in an output acoustic of the system, enabling reduced harmonic distortion in the output acoustic of the non-linear audio system;
wherein;the preprocessing transfer function is of the form; - View Dependent Claims (6, 7, 8)
-
Specification