Network-connected electronic stethoscope systems
Introduced here are electronic stethoscope systems designed to simultaneously monitor sounds originating from within a body under examination and the ambient environment. An electronic stethoscope system can include one or more input units that are connected to a hub unit. Each input unit may have at least one auscultation microphone and at least one ambient microphone. To improve the quality of sound recorded by an input unit, a processor can apply a noise cancellation algorithm that considers as input the audio data produced by the auscultation microphone(s) and the audio data produced by the ambient microphone(s). The audio data may be digitized directly in the input unit, and then transmitted to the hub unit for synchronization. For example, by examining the audio data produced by the ambient microphone(s), the processor may discover which digital artifacts, if any, should be filtered from the audio data produced by the auscultation microphone(s). The processor may reside within the input unit or the hub unit.
1. An electronic stethoscope system comprising:
a plurality of input units that are adherable to a surface of a living body,
wherein each input unit comprises:
a microphone configured to produce an electrical signal that is indicative of sounds internal to the living body,
a processor configured to—
digitize the electrical signal so as to produce a digital signal, and
append metadata that identifies the input unit to the digital signal, and
a data interface via which the digital signal exits the input unit; and
a hub unit that comprises:
a data interface at which to receive the plurality of digital signals from the plurality of input units, and
a processor configured to—
synchronize the plurality of digital signals based on analysis of the metadata appended to each digital signal, and
examine the plurality of digital signals to detect a biometric characteristic of the living body.
2. The electronic stethoscope system of claim 1 , wherein the data interface of the hub unit is part of a transceiver configured to facilitate wireless communication with each input unit via a separate communication channel.
3. The electronic stethoscope system of claim 1 , wherein the processor of the hub unit is further configured to—
apply a gain control algorithm to the plurality of digital signals to establish whether a given internal sound of the sounds internal to the living body exceeds a programmed intensity threshold.
4. The electronic stethoscope system of claim 3 , wherein the gain control algorithm is deployed as part of a feedback loop in which gain is dynamically adjusted based on whether the given internal sound exceeds the programmed intensity threshold.
5. The electronic stethoscope system of claim 3 , wherein the gain control algorithm dynamically adjusts gain based on a count of the plurality of input units that are communicatively connected to the hub unit.
6. The electronic stethoscope system of claim 1 , wherein the processor of the hub unit is further configured to—
cause playback of the plurality of digital signals in real time so that an individual may review the plurality of digital signals or analyses of the plurality of digital signals as an examination of the living body occurs.
7. An input unit comprising:
a microphone configured to produce audio data indicative of sounds internal to a living body;
a transceiver configured to effect a communication channel to facilitate communication with a destination across a network;
a pressure sensor configured to determine a distance between the input unit and the living body based on an amount of pressure applied to the pressure sensor and output attachment data that is indicative of an adhesion status of the input unit; and
a processor configured to:
append metadata that identifies the input unit to the audio data, and
forward the audio data to the transceiver for wireless transmission to the destination via the communication channel.
8. The input unit of claim 7 , further comprising:
a second microphone configured to produce second audio data indicative of sounds external to the living body.
9. The input unit of claim 8 , wherein the processor is further configured to:
append the metadata that identifies the input unit to the second audio data, and
forward the second audio data to the transceiver for wireless transmission to the destination via the communication channel.
10. The input unit of claim 7 , further comprising:
a structural body in which the microphone, the transceiver, and the processor reside; and
a conical resonator through which acoustic waves representative of the sounds internal to the living body are collected and directed toward the microphone.
11. The input unit of claim 10 , wherein the conical resonator has an outer opening across which a diaphragm extends and an inner opening toward which the microphone is oriented.
12. The input unit of claim 7 , wherein the processor is further configured to:
determine, based on the attachment data, whether the input unit is properly adhered to the living body,
initiate recording by the microphone responsive to a determination that the input unit is properly adhered to the living body.
13. The input unit of claim 7 , further comprising:
an inertial measurement unit configured to produce movement data indicative of a force, an inclination, an angular rate, or a magnetic field experienced by the input unit.
14. The input unit of claim 13 , wherein the processor is further configured to:
forward the movement data to the transceiver for wireless transmission to the destination via the communication channel, so as to enable the input unit to be synchronized with another input unit based on the movement data.