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System and method for adjusting an audio signal

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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.
Related Terms: Audio Digital Signal Processing Digitize Signal Processing Processing Device

Inventors: Christopher Forrester, Larry Hawker, Bao Ngyuen
USPTO Applicaton #: #20130003991 - Class: 381107 (USPTO) - 01/03/13 - Class 381 
Electrical Audio Signal Processing Systems And Devices > Including Amplitude Or Volume Control >Automatic

Inventors:

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The Patent Description & Claims data below is from USPTO Patent Application 20130003991, System and method for adjusting an audio signal.

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RELATED APPLICATIONS

This application is a continuation application of U.S. patent application Ser. No. 12/500,934 filed on Jul. 10, 2009, which itself is a continuation application of U.S. patent application Ser. No. 10/855,407 filed on May 28, 2004 (now U.S. Pat. No. 7,574,010).

FIELD OF DISCLOSURE

The disclosure relates to a system and method for adjusting an audio signal, in particular an audio signal generated by a speaker in a communication device.

BACKGROUND

In electronics, an audible audio signal is generated by generating an electrical signal representative of the audible signal and feeding that signal to a speaker. Various adjustments can be applied to the audio signal, including changing its volume, pitch and frequency, using known analog and digital signal processing techniques.

For a communication device, such as a cellular phone, a current feature provides a volume setting which selectively increases and decreases volume of an audio signal generated by the device\'s speaker. For a user of a cellular phone who has hearing difficulties, when he talks on the phone, the phone\'s volume setting may be placed at a “high” volume level, to increase the audio signal of the person calling the user. Alternatively, the volume setting may be set at a sufficiently high level to enable the user to listen to the audio signal generated by the cellular phone without requiring that the cellular phone be placed immediately near the user\'s ear. This setting is useful when the user checks his voice mail system. Therein, with a high volume level, he can hold the cellular phone in front of him and listen to his messages while still being able to see the keypad of the cellular phone. This enables him to see the keypad and quickly access the appropriate keys as he navigates through the commands of the voice mail system.

Increasing the volume on a cellular phone past a threshold level introduces distortion to the generated audio signal, thereby making it difficult to understand.

Known signal processing techniques provide dynamic monitoring of audio signals to dynamically recognize when an audio signal has excessive distortion and then provide a corrective shaping signal to it to reduce the distortion. Such techniques work very well, but use sophisticated evaluation techniques which require a significant amount of signal processing capabilities to implement them in real time. Smaller devices, such as cellular phones, have limited signal processing capabilities, and may not have sufficient capabilities to implement these techniques.

There is a need for a system and method of adjusting an audio signal in an efficient manner.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other aspects of the disclosure will become more apparent from the following description of specific embodiments thereof and the accompanying drawings which illustrate, by way of example only, the principles of the disclosure. In the drawings, where like elements feature like reference numerals (and wherein individual elements bear unique alphabetical suffixes):

FIG. 1 is a block diagram of a communication device associated with an embodiment;

FIG. 2 is a schematic diagram of operational elements associated with the communication device of FIG. 1;

FIG. 3 is a frequency response curve illustrating responses for selected output levels of audio signals produced by the communication device of FIG. 1;

FIG. 4 is a harmonic distortion curve illustrating distortion levels for selected output levels of audio signals produced by the communication device of FIG. 1; and

FIG. 5 is a flow chart of an algorithm used for adjusting signals used by the operational elements of FIG. 2.

DETAILED DESCRIPTION

OF AN EMBODIMENT

The description which follows, and the embodiments described therein, are provided by way of illustration of an example, or examples, of particular embodiments of the principles of the present disclosure. These examples are provided for the purposes of explanation, and not limitation, of those principles and of the disclosure. In the description, which follows, like parts are marked throughout the specification and the drawings with the same respective reference numerals.

In a first aspect, a method of adjusting a volume level for an audio signal for a communication device to comply with an audio frequency pass mask is provided. 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.

In the method, the first set of adjustment parameters may provide a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal.

In the method, the first set of adjustment parameters may provide a set of coefficients to further adjust the audio signal to boost higher frequency components in the audio signal.

In the method, the audio frequency pass mask may be a mask compliant with GSM standards.

The method may further comprise 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.

In the method, the processing filter may be a finite impulse response (FIR) filter; the first set of adjustment parameters may be a first set of coefficients for the FIR filter; and the second set of adjustment parameters may be a second set of coefficients for the FIR filter.

In the method, the audio frequency pass mask may define 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.

In a second aspect, a system for adjusting a volume level for an audio signal for a communication device in compliance with a quality threshold is provided. The system comprises: 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 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. The instructions are 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.

In the system, the first set of adjustment parameters may provide a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal.

In the system, the first set of adjustment parameters may provide a set of coefficients to further adjust the audio signal to boost higher frequency components in the audio signal.

In the system, the audio frequency pass mask may be a mask compliant with GSM standards.

In the system, the first module may provide 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.

In the system, the filter may be a FIR filter; the first set of adjustment parameters may be a first set of coefficients for the FIR filter; and the second set of adjustment parameters may be a second set of coefficients for the FIR filter.

In a third aspect, a circuit for adjusting an output audio signal of a communication device in compliance with a quality threshold is provided. The circuit comprises: 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; 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. The microprocessor is 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 DSP, a processing filter defined in the DSP, a first set of adjustment parameters and the digitized signal value.

In the circuit, the first set of adjustment parameters may provide a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal.

In the circuit, the first set of adjustment parameters may provide a set of coefficients to further adjust the audio signal to boost higher frequency components in the audio signal.

In the circuit, the audio frequency pass mask may be a mask compliant with GSM standards.

In the circuit, the microprocessor may be 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.

In the circuit, the processing filter may be a FIR filter; the first set of adjustment parameters may be a first set of coefficients for the FIR filter; and the second set of adjustment parameters may be a second set of coefficients for the FIR filter.

In the circuit, the quality threshold may define 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.

In another aspect, a method of adjusting a volume level for an audio signal for a communication device to comply with a quality threshold is provided. The method comprises: obtaining a digitized signal value of the audio signal and monitoring for an increase in the volume level. In the method, upon determining that implementing the increase in the volume level would produce an output that would exceed the quality threshold, processing the signal value to produce a first output signal value for the audio signal utilizing a DSP device in the communication device, a processing filter defined in the digital signal processing device, a first set of adjustment parameters and the signal value. In the method, upon determining that implementing the increase in the volume level would not exceed the quality threshold processing the signal value to produce a second output signal value for the audio signal utilizing the DSP, the processing filter, a second set of adjustment parameters and the signal value. In the method, the first output signal and the second output signal both implement the increase in the volume level.

In the method, the quality threshold may be an audio frequency pass mask.

In the method, the audio frequency pass mask is a mask compliant with GSM standards.

In the method, the processing filter may be a FIR filter; the first set of adjustment parameters may be a first set of coefficients for the FIR filter; and the second set of adjustment parameters may be a second set of coefficients for the FIR filter.

In the method, the second set of adjustment parameters may provide a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal.

In the method, the second set of adjustment parameters may provide a set of coefficients to further adjust the audio signal to boost higher frequency components in the audio signal.

In yet another aspect, a system for adjusting a volume level for an audio signal for a communication device in compliance with a quality threshold is provided. The system comprises: 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 for processing the digitized audio signal and producing a digital output signal utilizing a filter, the digitized audio signal and a set of parameters; a first module providing a set of instructions operating on the microprocessor; and a second module to convert the digitized audio signal to an analog audio signal and to provide the analog audio signal to a speaker. The set of instructions: determine when the request for change of volume occurs; identify a new volume level for the audio signal for the request; upon determining that implementing the new volume level would produce an output that would exceed the quality threshold, the instructions produce a first output volume signal through the digital signal processor using a first set of adjustment parameters as the set of parameters and the new volume level; and upon determining that implementing the new volume level would produce an output that would not exceed the quality threshold, the instructions produce a second output volume signal through the digital signal processor using a second set of adjustment parameters as the set of parameters and the new volume level. In the system, the first output signal and the second output volume signal both implement the change in the volume level.

In the system, the quality threshold may be an audio frequency pass mask.

In the system, the audio frequency pass mask may be a mask compliant with GSM standards.

In the system, the filter may be a FIR filter; the first set of adjustment parameters may be a first set of coefficients for the FIR filter; and the second set of adjustment parameters may be a second set of coefficients for the FIR filter.

In the system, the second set of adjustment parameters may provide a set of coefficients to adjust the audio signal to roll off lower frequency components in the audio signal.



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Electronic device and audio output control method thereof
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Device and method for manipulating an audio signal having a transient event
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Electrical audio signal processing systems and devices
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stats Patent Info
Application #
US 20130003991 A1
Publish Date
01/03/2013
Document #
13608135
File Date
09/10/2012
USPTO Class
381107
Other USPTO Classes
International Class
03G3/20
Drawings
6


Audio
Digital Signal Processing
Digitize
Signal Processing
Processing Device


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