Acoustic noise reduction audio system having tap control
First Claim
1. An acoustic noise reduction (ANR) audio system having tap control, comprising:
- an ANR module comprising;
an ANR engine comprising a first ANR engine input to receive an audio input signal, a second ANR engine input to receive a first supply current from a power supply through a first electrical path, and an ANR engine output to provide an audio output signal; and
an acoustic driver amplifier having a first driver amplifier input to receive a second supply current from the power supply through a second electrical path, a second driver amplifier input in communication with the ANR engine output to receive the audio output signal and a driver amplifier output to provide an amplified audio output signal;
a current sensor disposed in the second electrical path and having a sensor output to provide a signal responsive to a characteristic of the second supply current;
a signal conditioner module having an input in communication with the sensor output and having a signal conditioner output, the signal conditioner module providing a conditioned signal at the signal conditioner output in response to the signal responsive to the characteristic of the second supply current; and
an audio and mode control module having a first input to receive a source audio signal, a second input in communication with the signal conditioner output, and an output in communication with the first ANR engine input, the audio and mode control module controlling at least one of a mode of operation of a headphone system and an attribute of the audio input signal in response to the conditioned signal.
1 Assignment
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Accused Products
Abstract
An acoustic noise reduction (ANR) headphone described herein has current detection circuitry that detects current consumed by an acoustic driver amplifier as a result of pressure changes due to a tapping of the headphone. Tapping may be performed to change an audio feature or operating mode of the audio system for the headphone. The current detection circuitry senses a characteristic of the current consumed by the acoustic driver amplifier that can be used to determine an occurrence of a tap event. Examples of a characteristic include an amplitude, waveform or duration of the sensed current. Advantageously, the ANR headphones avoid the need for control buttons to initiate the desired changes to the audio feature or operating mode.
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Citations
11 Claims
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1. An acoustic noise reduction (ANR) audio system having tap control, comprising:
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an ANR module comprising; an ANR engine comprising a first ANR engine input to receive an audio input signal, a second ANR engine input to receive a first supply current from a power supply through a first electrical path, and an ANR engine output to provide an audio output signal; and an acoustic driver amplifier having a first driver amplifier input to receive a second supply current from the power supply through a second electrical path, a second driver amplifier input in communication with the ANR engine output to receive the audio output signal and a driver amplifier output to provide an amplified audio output signal; a current sensor disposed in the second electrical path and having a sensor output to provide a signal responsive to a characteristic of the second supply current; a signal conditioner module having an input in communication with the sensor output and having a signal conditioner output, the signal conditioner module providing a conditioned signal at the signal conditioner output in response to the signal responsive to the characteristic of the second supply current; and an audio and mode control module having a first input to receive a source audio signal, a second input in communication with the signal conditioner output, and an output in communication with the first ANR engine input, the audio and mode control module controlling at least one of a mode of operation of a headphone system and an attribute of the audio input signal in response to the conditioned signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A headphone comprising:
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a microphone for detecting a pressure change in a cavity of the headphone, the cavity comprising an ear canal of a wearer of the headphone; an ANR module comprising; an ANR engine having a first ANR engine input to receive an audio input signal, a second ANR engine input to receive a first supply current from a power supply through a first electrical path, a third ANR engine input in communication with the microphone, and an ANR engine output to provide an audio output signal; and an acoustic driver amplifier having a first driver amplifier input to receive a second supply current from the power supply through a second electrical path, a second driver amplifier input in communication with the ANR engine output to receive the audio output signal and a driver amplifier output to provide an amplified audio output signal; a current sensor disposed in the second electrical path and having a sensor output to provide a signal responsive to a characteristic of the second supply current; a signal conditioner module having an input in communication with the sensor output and having a signal conditioner output, the signal conditioner module providing a conditioned signal at the signal conditioner output in response to the signal responsive to the characteristic of the second supply current; and an audio and mode control module having a first input to receive a source audio signal, a second input in communication with the signal conditioner output, and an output in communication with the first ANR engine input, the audio and mode control module controlling at least one of a mode of operation of a headphone system and an attribute of the audio input signal in response to the conditioned signal. - View Dependent Claims (10, 11)
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Specification