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A buzzer or beeper is an audio signaling device, [1] which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices , timers , train and confirmation of user input such as a mouse click or keystroke.
A buzzer is often constructed by running string through two of the holes on a large button and is a common and easily made toy. A buzzer (buzz, bullroarer, button-on-a-string) is an ancient mechanical device used for ceremonial purposes and as a toy. It is constructed by centering an object at the midpoint of a cord or thong and winding the ...
A joy buzzer (also called a hand buzzer) is a practical joke device that consists of a coiled mainspring inside a disc worn in the palm of the hand. When the wearer shakes hands with another person, a button on the disc releases the spring, which rapidly unwinds creating a vibration that mimics an electric shock to the unsuspecting victim.
These phenomena can potentially generate vibrations of the ferromagnetic, conductive parts, coils and permanent magnets of electrical, magnetic and electromechanical device, resulting in an audible sound if the frequency of vibrations lies between 20 Hz and 20 kHz, and if the sound level is high enough to be heard (e.g. large surface of ...
The determination of the sound level can be based on the frequencies of occurrence of the sound items, or it can be estimated based on reading experiences: when a person with relatively rich reading experience sees a polyphonic polysemous character, sounds that can be read regardless of the context are frequent readings (such as “間 ...
Apple's smartphone shipments in China were 52% higher in April than a year ago, extending a rebound seen in the previous month, according to data from a research firm affiliated the Chinese ...
The instruments consist of a round, hexagonal, or octagonal sound box at the bottom with a neck attached that protrudes upwards. They also usually have two strings, and their soundboxes are typically covered with either snakeskin (most often python) or thin wood. Huqin instruments usually have two tuning pegs, one peg for each string.
By Liam Mo and Brenda Goh. BEIJING (Reuters) - Apple's iPhone shipments in China increased by 12% in March after the company and its retailers reduced prices, according to data from a research ...