Back to results
US 2006/0133620 A1Published application
Method and apparatus for frame-based loudspeaker equalization
AssigneeDoCoMo Communications Laboratories USA, Inc.
InventorKhosrow Lashkari
Life of this patent
Estimating the term…
Abstract
A method and apparatus for loudpeaker equalization are described. In one embodiment, the method comprising generating a set of parameters using an invertible, non-linear system based on input audio data and output data corresponding to a prediction of an output of a loudspeaker in response to the input data, and controlling an exact non-linear inverse of the non-linear system using the set of parameters to output a predistorted version of the input data.
Claims21
A method comprising:
- generating a set of parameters using an invertible, non-linear system based on input audio data and output data corresponding to a prediction of an output of a loudspeaker in response to the input data;
- and
- controlling an exact non-linear inverse of the non-linear system using the set of parameters to output a predistorted version of the input data.
A method comprising:
- predicting an output from a loudspeaker over one or more input data frames in response to one or more input data frames, the output of the non-linear loudspeaker model being in the form of one or more output data frames;
- calculating parameters in response to each input data frame and its corresponding output data frame from the loudspeaker model;
- and
- apply a predistortion signal to each input data frame of the input audio signal using an inverse system that is an exact and stable inverse of the invertible non-linear system and that operates in response to the parameters from the invertible non-linear system.
1 more element
A precompensator comprising:
- a loudspeaker model to predict one or more output data frames from a loudspeaker using a non-linear loudspeaker model in response to one or more input data frames;
- an invertible non-linear system to calculate parameters in response to input data frames and the output data frames;
- and
- an inverse system responsive to parameters from the invertible non-linear system to output a predistorted signal in response to each frame of the input audio signal.
1 more element
An audio processing system comprising:
- a frame division unit to divide an input audio signal into one or more input data frames;
- a non-linear loudspeaker model to predict an output from a loudspeaker over each of the one or more input data frames in response to one or more input data frames, the output of the non-linear loudspeaker model being in the form of one or more output data frames;
- an invertible non-linear system to calculate parameters in response to each input data frame and its corresponding output data frame from the loudspeaker model;
- and
- an inverse system that is an exact and stable inverse of the invertible non-linear system, the inverse system being responsive to parameters from the invertible non-linear system to apply predistortion signal in response to each input data frame of the input audio signal.
2 more elements
A method comprising:
- precompensating an input audio signal using a loudspeaker and either a Hammerstein or Wiener invertible non-linear system;
- and
- outputting the precompensated input audio signal.
Dependencies are inferred from the claim text.