SYSTEM AND METHOD FOR ADJUSTING AN AUDIO SIGNAL
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.