System and method for dynamic equalization of audio data

Abstract

A system for processing audio data is disclosed that includes a plurality of gain adjustment devices, each gain adjustment device having an associated audio input frequency band. A plurality of control signal processing systems are configured to receive audio input data for one of the associated audio input frequency bands and to generate a gain adjustment device control signal. The gain adjustment device control signal is configured to decrease a gain setting of an associated gain adjustment device for a predetermined period of time as a function of a transient in the associated audio input frequency band.

1 - 19 . (canceled) 
     
     
         20 . A system for processing audio data comprising:
 a clipping system configured to receive audio input data and to generate a clipped audio input signal;   a high pass filter coupled to the clipping system and configured to receive the clipped audio input signal and to generate high-pass filtered clipped audio data;   a scaler multiplier coupled to the high pass filter and configured to multiply the high-pass filtered clipped audio data by a predetermined value; and   a table coupled to the scaler multiplier and configured to receive a difference signal and to select the predetermined value as a function of the difference signal for use in generating an audio output signal.   
     
     
         21 . The system of  claim 20  further comprising one or more gain adjustment devices, each gain adjustment device having an associated audio input frequency band, wherein a gain adjustment device control signal is configured to decrease a gain setting of an associated gain adjustment device for a predetermined period of time as a function of a transient in the associated audio input frequency band. 
     
     
         22 . The system of  claim 20  further comprising a plurality of control signal processing systems, each control signal processing system configured to receive audio input data for an associated audio input frequency band and to generate a gain adjustment device control signal for use in generating the audio output signal. 
     
     
         23 . The system of  claim 20  further comprising a crossover filter coupled to a subtractor, the crossover filter configured to generate a low frequency output and a high frequency output and the subtractor configured to receive the low frequency output and the high frequency output and to generate the difference signal. 
     
     
         24 . The system of  claim 23  further comprising an RMS converter coupled between the crossover filter and the subtractor. 
     
     
         25 . The system of  claim 23  further comprising a linear to log converter coupled between the crossover filter and the subtractor. 
     
     
         26 . The system of  claim 20  further comprising an adder coupled to the table and one of the gain adjustment devices. 
     
     
         27 . A method for processing audio data comprising:
 generating a clipped audio input signal from audio input data with a clipping system;   generating high-pass filtered clipped audio data from the clipped audio input signal using a high pass filter coupled to the clipping system;   multiplying the high-pass filtered clipped audio data by a predetermined value using a scaler multiplier coupled to the high pass filter; and   receiving a difference signal at a table coupled to the scaler multiplier and selecting the predetermined value as a function of the difference signal to generate an output audio signal.   
     
     
         28 . The method of  claim 27  further comprising:
 generating a low frequency output and a high frequency output with a crossover filter coupled to the subtractor; and 
 receiving the low frequency output and the high frequency output at the subtractor and generating the difference signal. 
 
     
     
         29 . The method of  claim 28  further comprising coupling an RMS converter between the crossover filter and the subtractor. 
     
     
         30 . The method of  claim 28  further comprising coupling a linear to log converter between the crossover filter and the subtractor. 
     
     
         31 . The method of  claim 27  further comprising coupling an adder to the table and one of the gain adjustment devices. 
     
     
         32 . A non-transitory computer-readable medium encoded with computer-executable instructions that when executed by one or more processors cause the processor to:
 generate a clipped audio input signal from audio input data with a clipping system;   generate high-pass filtered clipped audio data from the clipped audio input signal using a high pass filter coupled to the clipping system;   multiply the high-pass filtered clipped audio data by a predetermined value using a scaler multiplier coupled to the high pass filter; and   receive a difference signal at a table coupled to the scaler multiplier and select the predetermined value as a function of the difference signal to generate an output audio signal.   
     
     
         32 . The non-transitory computer-readable medium of  claim 31  wherein the instructions cause the processor to:
 generate a low frequency output and a high frequency output with a crossover filter coupled to a subtractor; and 
 receive the low frequency output and the high frequency output at the subtractor and generate the difference signal. 
 
     
     
         33 . The non-transitory computer-readable medium of  claim 31  wherein the instructions cause the processor to couple an RMS converter between a crossover filter and a subtractor. 
     
     
         34 . The non-transitory computer-readable medium of  claim 31  wherein the instructions cause the processor to couple a linear to log converter between a crossover filter and a subtractor. 
     
     
         35 . The non-transitory computer-readable medium of  claim 31  wherein the instructions cause the processor to couple an adder to the table and a gain adjustment device.