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The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...
Its component channels are labelled for the sound pressure (the M in M/S), for the front-minus-back sound pressure gradient, for left-minus-right (the S in M/S) and for up-minus-down. [ note 1 ] The W {\displaystyle W} signal corresponds to an omnidirectional microphone, whereas X Y Z {\displaystyle XYZ} are the components that would be picked ...
High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).
Exciter: harmonic exciter adding additional high frequency harmonics; Bass Enhancer: harmonic exciter adding low frequency harmonics; Tape Simulator: simulates the effects of magnetic tape and corresponding players; Vinyl: adds different controllable sounds produced by vinyl records and filters the signal
It incorporated a high-frequency horn that sent sound through a hole in the pole piece of a 15-inch woofer for near-point-source performance. [13] Altec's "Voice of the Theatre" loudspeaker system was first sold in 1945, offering better coherence and clarity at the high output levels necessary in movie theaters. [ 14 ]
High-resolution audio (high-definition audio or HD audio) is a term for audio files with greater than 44.1 kHz sample rate or higher than 16-bit audio bit depth. It commonly refers to 96 or 192 kHz sample rates. However, 44.1 kHz/24-bit, 48 kHz/24-bit and 88.2 kHz/24-bit recordings also exist that are labeled HD audio.