The vibration generated by the earbud wires or units by external collision or air friction, through the earbud wires directly (in-ear wires are generally stiffer, conducive to the transmission of vibration) transmitted to the ear canal, resulting in a very unpleasant sound.
Back-mounted headphones greatly improve the stethoscope effect. Personally, I recommend using a cable clip to clip the headphone cable to your clothing to almost completely eliminate the stethoscope effect.
The stethoscope is the most commonly used diagnostic device for internal and external gynecologists and pediatricians, and it is the symbol of the physician, and modern medicine began with the invention of the stethoscope. Stethoscope since March 8, 1817 since the application of clinical, shape and sound transmission method has been improved, but its basic structure has not changed much, mainly by the sound-gathering part (chest piece), the conduction part (hose) and listening to the sound of the part (ear piece) composition.
French doctor Laennec (Laennec 1781 - 1826) in 1816, the first invention of the stethoscope, March 8, 1817 began to be used for clinical diagnosis.
The types of stethoscopes currently include single-use stethoscopes, dual-use stethoscopes, triple-use stethoscopes, vertical stethoscopes, multi-use stethoscopes, and the most recent electronic stethoscopes; the colors are also available in a variety of colors. Generally, they are divided into several types by different combinations of heads. Flat stethoscope heads are commonly used to listen to high-pitched murmurs, and dual-function flat stethoscopes are used to detect low-frequency heart sounds, dilated and tertiary sounds, as well as the first and second heart sounds, which are already audible in the pediatric heart. Bell-shaped stethoscope head is often used to auscultate low-pitched murmurs and can hear the heartbeat of an infant in the abdomen. Table stethoscope head, commonly used to listen to the wrist pulse sound.