Stethoscope: Digital

Digital Stethoscope Solutions from Texas Instruments

Block Diagram

Click on the colored blocks to view or sample recommended solutions

AC/DC Adaptor


TI's TMS320C5515 DSP Evaluation Module together with TI's digital stethoscope analog front-end module make up the new C5505 DS Medical Development Kit (MDK) provides developers access to a development tool set that offers a complete signal chain solution along with software to save months of development time and for portable patient monitoring applications that demand battery efficiency.

The main elements of a Digital Stethoscope are the sensor unit that captures the heart and lung sounds (also known as auscultations), digitization, and digital processing of the auscultations for noise reduction, filtering and amplification. Algorithms for heart rate detection and heart defect detection may also be included.

Power and Battery Management are key in this ultra-portable diagnostic tool, where key design considerations are ultra-low power consumption and high efficiency driven by the need for extended battery life, and high precision with a fast response time allowing quick determination of the patient's health status. Additional requirements may drive the need for recording the auscultations, cabled or wireless interfaces for transmission of the auscultations. Also, to enable ease of use, features like touch screen control and display backlighting are key to usability of the device. Adding all these features without significantly increasing power consumption is a huge challenge.  Texas Instruments portfolio of Processors, Instrumentation and Buffer Amplifiers, Power and Battery Management, Audio Codecs, and both wired and wireless interface devices provides the ideal tool box for Digital Stethoscope applications.

The common core subsystems of a Digital Stethoscope are:

  • Analog Front-End/Sensor Interface and Codec

Auscultations signal input is amplified and then digitized by the Audio Codec. Auscultations signal after being digitized and subjected to signal processing, is converted to analog and sent to the stethoscope earpiece.

  • Low Power Processor

Processors capable of executing all of the digital stethoscopes signal processing including key functions such as noise reduction, algorithms for heart rate detection, and heart defect detection while maintaining a very low constant current draw from the battery are good fit. The ability to control interfacing with memory and peripheral devices is also helpful. Given the nature of the device, processors that can manage the digital display and keyed functions allowing auscultation waveforms to be displayed and manipulated without additional components are ideal.

  • Data Storage and Transmission

The auscultations can be recorded on MMC/SD card, or on a USB device. It can also be transmitted via wireless capability such as Bluetooth.

View more

Application Notes (1)

Title Abstract Type Size (KB) Date Views
HTM 9 KB 29 Jun 2010 480

Selection and Solution Guides

Selection Guides (1)

Title Abstract Type Size (KB) Date Views
PDF 11.49 MB 05 Aug 2010 910

Product Bulletin & White Papers

Product Bulletin (1)

Title Abstract Type Size (MB) Date Views
PDF 151 KB 26 Jun 2009 432

White Papers (1)

Title Abstract Type Size (MB) Date Views
PDF 393 KB 27 Jun 2014 10035

News Releases & Authored Articles

Visit the News Center

Similar End-Equipment Solutions

TI End-Equipment

All TI End-Equipment Solutions

Support and Community


Visit the TI Wiki

Training & events

Name Type Available During
TI's C553x DSPs - industry's lowest price and lowest power DSPs
TI's breakthrough price for DSPS extends sophisticated signal processing and ultra-low-power into new world of cost-sensitive apps
On-Line Training   On Demand  
Technical Overview of the Ultra-low power C5505
TI’s latest TMS320C5504/05 low-power DSPs provide energy efficieny and longer battery life for portable applications such as...
On-Line Training   On Demand  
Introduction to Stellaris® ARM Cortex™-M3 MCUs

TI's Stellaris MCUs pair the ARM Cortex-M3 core along with advanced communication capabilities...

On-Line Training   On Demand  
Analog and Embedded Processing Solutions for Medical Applications

Customers can easily begin designing with TIs’ Medical Development Kit (MDK), based on the TMS320C5505 DSP.

On-Line Training   On Demand  
Designing with Ultra Low Power Segmented Displays
Learn about designing Ultra-low Power Segmented Displays and MSP430
On-Line Training   On Demand  

See more training & events

Other Support