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External noise from the environment or internal noise from the patient (e.g. breathing) make heart sound segmentation challenging. Feature extraction: Having identified the phases of the heartbeat, information from the heart sound is extracted that enters a further classification stage. Features can range from simple energy-based approaches to ...
A 3D-printed stethoscope is an open-source medical device meant for auscultation and manufactured via means of 3D printing. [31] The 3D stethoscope was developed by Dr. Tarek Loubani and a team of medical and technology specialists. The 3D-stethoscope was developed as part of the Glia project, and its design is open source from the outset.
After the larger, elaborate wind-up machine art declined in interest, wind-up toys were created cheaply in large numbers by the 1800s. Wind-up machines became known as wind-up toys, and were designed in different forms to move around. [1] European toy makers created and mass-produced the first wind-up tin toys during the late 1880s.
Tik-Tok (sometimes spelled Tiktok) is a round-bodied mechanical man made of copper, who runs on clockwork springs which periodically need to be wound, like a wind-up toy or a mechanical clock. He has separate windings for thought, action, and speech. Tik-Tok is unable to wind any of them up himself. When his works run down, he becomes frozen or ...
A Pinard horn is a type of stethoscope used to listen to the heart rate of a fetus during pregnancy. It is a hollow horn, often made of wood or metal, about 200 millimetres (7.9 in) long. It functions similarly to an ear trumpet by amplifying sound. The user holds the wide end of the horn against the pregnant woman's abdomen, and listens ...
A moo box. The moo box or moo can is a toy or a souvenir, also used as a hearing test.When turned upside down, it produces a noise that resembles the mooing of a cow.The toy can be configured to create other animal sounds such as the meowing of a cat, the sound of a bird, or the bleat of a sheep.
A cymbal-banging monkey toy (also known as Jolly Chimp) is a mechanical depiction of a monkey holding a cymbal in each hand. [1] When activated it repeatedly bangs its cymbals together and, in some cases, bobs its head, chatters, screeches, grins, and more. There are both traditional wind-up versions and updated battery-operated cymbal-banging ...
The first types were clock-like, giving off air-borne sound to the tubes of a stethoscope; the sound distributor head had a valve that could be gradually closed. Another model used a tripped hammer to strike a metal rod and produce the testing sound; in another, a tuning fork was struck.