Smart headphone system and method
View Patent ↗Various embodiments comprise systems, methods, architectures, mechanisms and apparatus providing a sensing platform wherein one or more headphone drivers are used as a versatile sensor to receive excitation signals therefrom indicative of direct or indirect pressures associated with the ear canal acoustically cooperating with the diaphragms operatively coupled to the drivers.
1 . An apparatus configured to couple a first audio input signal to a headset having a first
magnetic coil driver operatively coupled to a first diaphragm to responsively generate thereby first audible sound for a headset wearer while receiving from the first magnetic coil a first excitation signal generated thereby in response to external pressures imparted to the first diaphragm, the apparatus comprising:
a Wheatstone bridge including two balanced voltage divider arms, a first of the voltage divider arms including the first magnetic coil driver of the headset and providing the first audio input signal thereto, the Wheatstone bridge nulling electrical energy associated with the audio input signal to provide thereby an output signal primarily comprising electrical energy associated with an excitation signal generated by the first magnetic coil driver in response to external pressures imparted to the first diaphragm; and
an amplifier circuit, for amplifying the Wheatstone bridge output signal to provide thereby the first excitation signal configured to enable determination of the external pressures imparted to the diaphragm.
2 . The apparatus of claim 1 , further configured to couple a second audio input signal to the headset, the headset further comprising a second magnetic coil driver operatively coupled to a second diaphragm to responsively generate thereby second audible sound for a headset wearer while receiving from the second magnetic coil a second excitation signal generated thereby in response to external pressures imparted to the second diaphragm, the apparatus further comprising:
a second Wheatstone bridge including two balanced voltage divider arms, a first of the voltage divider arms including the second magnetic coil driver of the headset and providing the second audio input signal thereto, the Wheatstone bridge nulling electrical energy associated with the second audio input signal to provide thereby an output signal primarily comprising electrical energy associated with an excitation signal generated by the second magnetic coil driver in response to external pressures imparted to the second diaphragm; and
an amplifier circuit, for amplifying the Wheatstone bridge output signal to provide thereby a second excitation signal configured to enable determination of the external pressures imparted to the diaphragm.
3 . The apparatus of claim 1 , wherein the headset is configured for connection to an audio output device, and the apparatus is configured to be connected to both the headset and the audio output device.
4 . The apparatus of claim 1 , wherein the headset is configured for connection to a user device, and the apparatus is configured to be connected to both the headset and the user device.
5 . The apparatus of claim 1 , wherein the excitation signal includes audio signal caused by external pressures imparted to the diaphragm from vocal utterances of a wearer of the headset.
6 . The apparatus of claim 1 , wherein the excitation signal includes audio signal caused by external pressures imparted to the diaphragm from nominal pressures associated with an ear canal geometry of a wearer of the headset.
7 . The apparatus of claim 1 , wherein the excitation signal includes audio signal caused by external pressures imparted to the diaphragm from repetitive pressure changes associated with a beating heart of a wearer of the headset.
8 . The apparatus of claim 1 , wherein said apparatus further comprises an enclosure configured for mechanically supporting the Wheatstone bridge and amplifier circuit, the enclosure having disposed thereon a first headset connector configured to provide electromechanical cooperation between the apparatus and a headset device, and a second headset connector configured to provide electromechanical cooperation between the apparatus and a user device.
9 . The apparatus of claim 8 , wherein first and second headset connectors comprise at least one of a 3.5 mm plug, a universal serial bus (USB) connector, a micro-USB connector, a USB-C connector, and a Lightning connector.
10 . The apparatus of claim 1 , wherein said apparatus is included within a user device.
11 . The apparatus of claim 4 , wherein said user device, in an authentication interpretation mode of operation, causes an audio chirp signal to be propagated to the headset to induce thereby an excitation signal indicative of an inner ear structure of a headset wearer.
12 . The apparatus of claim 4 , wherein said user device, in a gesture interpretation mode of operation, monitors an excitation signal to derive therefrom user gesture input suitable for use in adapting a function of the user device.
13 . The apparatus of claim 4 , wherein said user device, in a voice interpretation mode of operation, monitors an excitation signal to derive therefrom user voice input suitable for use in adapting a function of the user device.
14 . The apparatus of claim 2 , wherein the first and second magnetic coil drivers exhibit a substantially similar impedance.
15 . The apparatus of claim 1 , further comprising:
a first differential amplifier configured amplifying a difference between the first and second audio input signals, and a second differential amplifier configured for amplifying a difference between the first and second excitation signals;
wherein the amplifier circuit comprises a third differential amplifier configured to amplify a difference between output signals of the first and second differential amplifiers.
16 . The apparatus of claim 15 , further comprising:
a first buffer, configured to provide a buffered first audio signal to the first magnetic coil driver; and
a second buffer, configured to provide a buffered second audio signal to the second magnetic coil driver.
17 . The apparatus of claim 15 , wherein the amplifying circuits together comprise a three-port circulator having a first port configured to receive audio input signal, a second port configured to provide audio input signal to the magnetic coil driver and to receive from the magnetic coil driver electrical energy associated with excitation signal, and a third port configured to provide amplified excitation signal.
18 . A method for coupling an audio input signal to a headset having a magnetic coil driver operatively coupled to a diaphragm to responsively generate thereby audible sound for a headset wearer while receiving from the magnetic coil an excitation signal generated thereby in response to external pressures imparted to the diaphragm, the method comprising:
providing the audio input signal to the magnetic coil driver of the headset via a Wheatstone bridge including two balanced voltage divider arms, a first of the voltage divider arms including the magnetic coil driver of the headset;
receiving an output signal of the Wheatstone bridge, the Wheatstone bridge nulling electrical energy associated with the audio input signal to provide thereby an output signal primarily comprising electrical energy associated with an excitation signal generated by the magnetic coil driver in response to external pressures imparted to the diaphragm; and
amplifying the Wheatstone bridge output signal to provide thereby the excitation signal configured to enable determination of the external pressures imparted to the diaphragm.
19 . The method of claim 18 , further comprising:
in an authentication interpretation mode of operation, causing an audio chirp signal to be propagated to the headset; and
interpreting a received excitation signal to determine thereby a profile of an inner ear structure of a headset wearer.
20 . The method of claim 18 , further comprising:
in a gesture interpretation mode of operation, monitoring a received excitation signal to derive therefrom user gesture input suitable for use in adapting a function of a user device.
21 . The method of claim 18 , further comprising:
in a voice interpretation mode of operation, monitoring a received excitation signal to derive therefrom user voice input suitable for use in adapting a function of a user device.
22 . The method of claim 18 , further comprising:
in a physiological interpretation mode of operation, monitoring a received excitation signal to derive therefrom repetitive physiological information of the headset user suitable for use in adapting a function of a user device.
23 . The method of claim 22 , wherein said repetitive physiological information comprises physiological information associated with one or both of heartbeat and breathing information.
24 . The method of claim 18 , further comprising:
in a physiological interpretation mode of operation, monitoring a received excitation signal to derive therefrom physiological information of the headset user suitable for use in adapting a function of a user device, said physiological information associated with one or more of micro-seizures, thermal shivering, jaw clenching, and blood pressure.
25 . The method of claim 18 , further comprising:
in a noise interpretation mode of operation, monitoring a received excitation signal to derive therefrom an ambient noise voice input suitable for use in generating a corresponding noise cancelling signal.
26 . The method of claim 18 , further comprising:
in a noise interpretation mode of operation, monitoring received excitation signals from each of a left and right headset driver to derive therefrom respective ambient noise input signals, and determining that a difference in respective ambient noise levels above a threshold amount indicates an improper sealing of the headset associated with the headset driver exhibiting the larger ambient noise level.