The main components of a digital stethoscope include sensor units (also known as auscultation) that collect heart sounds and lung sounds, digitize and digitize auscultation for noise reduction, filtering, and amplification. It may also include algorithms for heart rate detection and heart defect detection.
Power and battery management are key factors in this type of ultraportability diagnostic tool. Key design considerations include ultra-low power consumption and high efficiency driven by extended battery life requirements, as well as high precision and fast response times that allow for quick understanding of patient health. . Other requirements may drive the need for recording auscultation, wired or wireless interfaces for transmitting auscultation. In addition, for ease of use, features such as touch screen controls and display backlighting are critical to the application of the device. Adding all of these features without significantly increasing power consumption is a huge challenge. Texas Instruments' controllers, instrumentation and cache amplifiers, power and battery management, audio codecs, and wireless and wireless interface device families provide the ideal toolbox for digital stethoscope applications.
The universal kernel subsystem of the digital stethoscope includes:
Analog front end / sensor interface and codec
The auscultation signal input is amplified and then digitized by the audio codec. After the auscultation signal is digitized and signal processed, it is converted to an analog signal, which is then sent to the stethoscope earpiece.
Low power processor
It is a good choice for processors that perform all of the main functions of digital stethoscopes including noise reduction, heart rate detection and heart defect detection algorithms while maintaining a very low constant current generated by the battery. Controlling the functions connected to memory and peripherals is also very useful. Assuming that the processor has the nature of a device that manages the digital display and keying functions, it supports the display and operation of auscultation waveforms without providing other components, so it will be impeccable.
Data storage and transmission
The auscultation data can be recorded on an MMC/SD card or USB device. It can be transmitted via wireless functions such as Bluetooth.
Digital stethoscope system block diagram
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