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2. David Littmann - Wikipedia

   en.wikipedia.org/wiki/David_Littmann

   A Littmann stethoscope. David Littmann (July 28, 1906 – January 1, 1981) was an American cardiologist and Harvard Medical School professor and researcher. [1] The name Littmann is well known in the medical field for the patented Littmann Stethoscope reputed for its acoustic performances for auscultation.

3. Stethoscope - Wikipedia

   en.wikipedia.org/wiki/Stethoscope

   Currently, a number of companies offer electronic stethoscopes. Electronic stethoscopes require conversion of acoustic sound waves to electrical signals which can then be amplified and processed for optimal listening. Unlike acoustic stethoscopes, which are all based on the same physics, transducers in electronic stethoscopes vary widely.

4. Low Frequency Analyzer and Recorder - Wikipedia

   en.wikipedia.org/wiki/Low_Frequency_Analyzer_and...

   Each system, from shore facility to the transducer array was a sonar set with the signal processing beginning as the array's signals were amplified, processed into beams by time delay and each beam processed by an electromechanical spectrum analyzer with the display being a sweep of the frequency spectrum's intensity burned across electrostatic ...

5. Assistive listening device - Wikipedia

   en.wikipedia.org/wiki/Assistive_Listening_Device

   There are also other consumer ALDs such as alarm clocks with bed shakers, amplified stethoscopes, baby monitors, and flashing door bell indicators. [4] Most FM assistive listening devices operate on seventeen channels between 72.1000 and 75.800 MHz. [5]

6. We Must Fight Antisemitism 80 Years After the Liberation of ...

   www.aol.com/news/must-fight-antisemitism-80...

   A view of the former Nazi German concentration camp Auschwitz II-Birkenau in Brzezinka near Oswiecim, Poland, on Jan. 21, 2025. Credit - Jakub Porzycki—Getty Images Monday, Jan. 27, marks 80 ...

7. Heart sounds - Wikipedia

   en.wikipedia.org/wiki/Heart_sounds

   Using electronic stethoscopes, it is possible to record heart sounds via direct output to an external recording device, such as a laptop or MP3 recorder. The same connection can be used to listen to the previously recorded auscultation through the stethoscope headphones, allowing for a more detailed study of murmurs and other heart sounds, for ...