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An adaptive system for active noise reduction

G Makarewicz1, G Matuszewski, L Morzyński

  • 1Department of Noise and Electromagnetic Hazards, Central Institute for Labour Protection, Warsaw, Poland. grmak@ciop.pl.

International Journal of Occupational Safety and Ergonomics : JOSE
|May 29, 2000
PubMed

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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