System and method for adjusting an audio signal

Abstract

Disclosed is a system and method of adjusting a volume level for an audio signal for a communication device to comply with a quality threshold. The method comprises: monitoring for an increase in the volume level; and upon determining that implementing the increase in the volume level would produce an output that would exceed the audio frequency pass mask, processing a digitized signal value of the audio signal to produce a first output signal value for the audio signal implementing the increase in the volume level utilizing a digital signal processing (DSP) device in the communication device, a processing filter defined in the digital signal processing device, a first set of adjustment parameters and the digitized signal value.

1 . A method of adjusting a volume level for an audio signal for a communication device to comply with an audio frequency pass mask, the method comprising:
 monitoring for an increase in the volume level; and   upon determining that implementing the increase in the volume level would produce an output that would exceed the audio frequency pass mask, processing a digitized signal value of the audio signal to produce a first output signal value for the audio signal implementing the increase in the volume level utilizing a digital signal processing (DSP) device in the communication device, a processing filter defined in the digital signal processing device, a first set of adjustment parameters and the digitized signal value.   
     
     
         2 . The method of adjusting a volume level for an audio signal for a communication device as claimed in  claim 1 , wherein the first set of adjustment parameters provides a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal. 
     
     
         3 . The method of adjusting a volume level for an audio signal for a communication device as claimed in  claim 2 , wherein the first set of adjustment parameters provides a set of coefficients to further adjust the audio signal to boost higher frequency components in the audio signal. 
     
     
         4 . The method of adjusting a volume level for an audio signal for a communication device as claimed in  claim 1 , wherein the audio frequency pass mask is a mask compliant with GSM standards. 
     
     
         5 . The method of adjusting a volume level for an audio signal for a communication device as claimed in  claim 1 , further comprising:
 upon determining that implementing the increase in the volume level would not exceed the quality threshold, processing the digitized signal value to produce a second output signal value for the audio signal that also implements the increase in the volume level utilizing the DSP, the processing filter, a second set of adjustment parameters and the digitized signal value.   
     
     
         6 . The method of adjusting a volume level for an audio signal for a communication device as claimed in  claim 5 , wherein:
 the processing filter is a finite impulse response (FIR) filter;   the first set of adjustment parameters is a first set of coefficients for the FIR filter; and   the second set of adjustment parameters is a second set of coefficients for the FIR filter.   
     
     
         7 . The method of adjusting a volume level for an audio signal for a communication device as claimed in  claim 5 , wherein the audio frequency pass mask defines a boundary associated with one of the following attributes relating to the audio signal:
 a signal boost for selected signals;   gain adjustment;   side tone frequency adjustment;   switching adjustments;   signal suppression; and   adjustments for a microphone in the communication device.   
     
     
         8 . A system for adjusting a volume level for an audio signal for a communication device in compliance with a quality threshold, the system comprising:
 a module to accept a request for change of volume for the audio signal;   a module to receive the audio signal and convert the audio signal to a digitized audio signal;   a microprocessor;   a digital signal processor (DSP) for processing the digitized audio signal and producing a digital output signal utilizing a filter, the digitized audio signal and a set of parameters; and   a first module providing a set of instructions operating on the microprocessor to:
 determine when the request for the change of volume occurs; 
 identify a new volume level for the audio signal for the request; and 
 upon determining that implementing the new volume level would produce an output that would exceed the quality threshold
 process a digitized signal value of the audio signal to produce a first output signal value to implement the new volume level for the audio signal utilizing the DSP, a processing filter defined in the DSP, a first set of adjustment parameters and the digitized signal value. 
 
   
     
     
         9 . The system for adjusting a volume level for an audio signal for a communication device as claimed in  claim 8 , wherein the first set of adjustment parameters provides a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal. 
     
     
         10 . The system for adjusting a volume level for an audio signal for a communication device as claimed in  claim 9 , wherein the first set of adjustment parameters provides a set of coefficients to further adjust the audio signal to boost higher frequency components in the audio signal. 
     
     
         11 . The system for adjusting a volume level for an audio signal for a communication device as claimed in  claim 8 , wherein the audio frequency pass mask is a mask compliant with GSM standards. 
     
     
         12 . The system for adjusting a volume level for an audio signal for a communication device as claimed in  claim 8 , wherein the first module provides a further set of instructions operating on the microprocessor to:
 upon determining that implementing the new volume level would not exceed the quality threshold, process the digitized signal value to produce a second output signal value for the audio signal to implement the new volume level utilizing the DSP, the processing filter, a second set of adjustment parameters and the digitized signal value.   
     
     
         13 . The system for adjusting a volume level for an audio signal for a communication device as claimed in  claim 12 , wherein:
 the filter is a finite impulse response (FIR) filter;   the first set of adjustment parameters is a first set of coefficients for the FIR filter; and   the second set of adjustment parameters is a second set of coefficients for the FIR filter.   
     
     
         14 . A circuit for adjusting an output audio signal of a communication device in compliance with a quality threshold, the circuit comprising:
 a module for receiving a signal encoding an audio signal and converting the signal to a digitized signal;   a module to accept a request for an increase in a current volume setting to an increased volume level for the output audio signal;   a microprocessor provided with instructions to
 monitor for an increase in the volume level; 
 determine when the request for the change of volume occurs; 
 identify a new volume level for the audio signal for the request; and 
 upon determining that implementing the new volume level would produce an output that would exceed the quality threshold
 process a digitized signal value of the audio signal to produce a first output signal value to implement the new volume level for the audio signal utilizing a digital signal processor (DSP), a processing filter defined in the DSP, a first set of adjustment parameters and the digitized signal value; and 
 
   a module to convert the adjusted version of the digitized signal to an analog audio signal and to provide the analog audio signal to a speaker.   
     
     
         15 . The circuit as claimed in  claim 14 , wherein the first set of adjustment parameters provides a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal. 
     
     
         16 . The circuit as claimed in  claim 14 , wherein the first set of adjustment parameters provides a set of coefficients to further adjust the audio signal to boost higher frequency components in the audio signal. 
     
     
         17 . The circuit as claimed in  claim 14 , wherein the audio frequency pass mask is a mask compliant with GSM standards. 
     
     
         18 . The circuit as claimed in  claim 14 , wherein the microprocessor is provided with further instructions to
 upon determining that implementing the new volume level would not exceed the quality threshold, process the digitized signal value to produce a second output signal value for the audio signal to implement the new volume level utilizing the DSP, the processing filter, a second set of adjustment parameters and the digitized signal value.   
     
     
         19 . The circuit as claimed in  claim 18 , wherein:
 the processing filter is a finite impulse response (FIR) filter;   the first set of adjustment parameters is a first set of coefficients for the FIR filter; and   the second set of adjustment parameters is a second set of coefficients for the FIR filter.   
     
     
         20 . The circuit as claimed in  claim 19 , wherein the quality threshold defines a boundary associated with one of the following attributes relating to the audio signal:
 a signal boost for selected signals;   gain adjustment;   side tone frequency adjustment;   switching adjustments;   signal suppression; and   adjustments for a microphone in the communication device.