MULTIMODAL PHYSIOLOGICAL SENSING FOR WEARABLE DEVICES OR MOBILE DEVICES
Embodiments relate generally to electrical and electronic hardware, computer software, wired and wireless network communications, and wearable computing devices for sensing health and wellness-related physiological characteristics. More specifically, disclosed is a physiological sensor using, for example, acoustic signal energy to determine physiological characteristics in one mode, such as a heart rate, the physiological sensor being disposed in a wearable device (or carried device), and generating data communication signals using acoustic signal energy in another mode. The physiological sensor also can be configured to receive data communication signals. In at least one embodiment, an apparatus includes one or more multimodal physiological sensors configured to receive physiological signals in a first mode and at least generate data communication signals in a second mode. A wearable housing includes the multimodal physiological sensors, and a multimodal physiological sensing device is configured to receive a sensor signal and generate data representing a physiological characteristic.
1 . An apparatus comprising:
one or more multimodal physiological sensors configured to receive physiological signals in a first mode and to generate data communication signals in a second mode;
a wearable housing including the one or more multimodal physiological sensors, the wearable housing configured to position at least a subset of the one or more multimodal physiological sensors to receive a physiologic signal originating from human tissue; and
a multimodal physiological sensing device configured to receive a sensor signal to based on the physiologic signal, the multimodal physiological sensing device being further configured to generate data representing a physiological characteristic.
2 . The apparatus of claim 1 , wherein the multimodal physiological sensing device is configured to further to generate a heart rate signal as the physiological characteristic.
3 . The apparatus of claim 1 , wherein the one or more multimodal physiological sensors further comprise:
one or more multimodal piezoelectric transducers configured to receive acoustic physiological signals in the first mode and to generate acoustic communication signals in the second mode.
4 . The apparatus of claim 3 , wherein the acoustic signals are generated by either blood vessel pulsation or a human heart, or both.
5 . The apparatus of claim 3 , wherein the one or more multimodal piezoelectric sensors comprise:
a piezoelectric transducer configured to receive the acoustic physiological signals in an audible range of frequencies in the first mode.
6 . The apparatus of claim 3 , wherein the one or more multimodal piezoelectric sensors comprise:
a piezoelectric transducer configured to generate the acoustic communication signals in an ultrasonic range of frequencies in the second mode.
7 . The apparatus of claim 3 , wherein the one or more multimodal piezoelectric sensors comprise:
a piezoelectric transducer configured to receive the acoustic communication signals in an ultrasonic range of frequencies in a third mode.
8 . The apparatus of claim 1 , wherein the multimodal physiological sensing device comprises:
a physiological signal detector configured to determine a heart rate in the first mode; and
a data signal generator configured to generate a data communication signal in the second mode.
9 . The apparatus of claim 1 , wherein the one or more multimodal physiological sensors comprise:
a piezoelectric transducer configured to operate in the first mode and the second mode.
10 . The apparatus of claim 9 , wherein a portion of the piezoelectric transducer is formed external to a surface of the wearable housing, the portion of the piezoelectric transducer being configured to contact the human tissue.
11 . The apparatus of claim 9 , wherein the piezoelectric transducer is formed within the wearable housing, the wearable housing further comprising:
a first material having an acoustic impedance value in a range of acoustic impedance values including a value of acoustic impedance for the human tissue, the first material being disposed between an inner surface of the wearable housing and the piezoelectric transducer to facilitate propagation of an acoustic physiological signal from the human tissue to the piezoelectric transducer.
12 . The apparatus of claim 9 , wherein the piezoelectric transducer is formed within the wearable housing, the wearable housing further comprising:
a second material being disposed between an outer surface of the wearable housing and the piezoelectric transducer to facilitate propagation of an acoustic communication signal from the piezoelectric transducer to an environment external to the wearable housing.
13 . The apparatus of claim 9 , further comprising:
a coupler having an acoustic impedance equivalent to the human tissue, at least a first surface of the coupler being formed external to a surface of the wearable housing and second surface of the coupler being configured to communicate the acoustic signal from the first surface of the coupler to the piezoelectric transducer.
14 . The apparatus of claim 1 , wherein one or more multimodal physiological sensors comprise:
a skin surface microphone (“SSM”) being formed in the wearable housing to contact human tissue.
15 . The apparatus of claim 1 , wherein one or more multimodal physiological sensors comprise:
an array of piezoelectric transducers.
16 . The apparatus of claim 15 , further comprising:
a transducer selector configured to select a first subset of piezoelectric transducers to receive acoustic signals.
17 . The apparatus of claim 15 , further comprising:
an aberrant signal reducer configured to select a second subset of piezoelectric transducers to identify common acoustic signals in a first piezoelectric transducer and a second piezoelectric transducer, the aberrant signal reducer being further configured to identify the physiological signal as a difference between acoustic signals applied to the first piezoelectric transducer and the second piezoelectric transducer.
18 . A method comprising:
receiving an acoustic signal originating from human tissue, the acoustic signal associated with a physiological characteristic;
generating a first piezoelectric signal responsive to the acoustic signal;
determining a portion of the piezoelectric signal associated with a heartbeat derived from the acoustic signal;
identifying a heart rate at a processor based on the portion of the piezoelectric signal;
detecting data to be transmitted acoustically; and
generating a second piezoelectric signal to transmit the data via a piezoelectric transducer to communicate the data.
19 . The method of claim 17 , wherein receiving the acoustic signal originating from the human tissue comprises:
receiving the acoustic signal via a coupler configured to communicate the acoustic signal from a surface of the human tissue to a piezoelectric sensor, the coupler having an acoustic impedance equivalent to the human tissue.
20 . The method of claim 17 , further comprising:
transmitting data representing the heart rate to a device.