Patent ID: 6483926
Filing Date: 2002-11-19
Classification: G10K

Abstract:
A floor impact noise suppressor for reducing propagation of floor impact noises having a sound wave frequency of not more than about 500 Hz, generated in an upper story to a lower story in a multi-storied building, comprising:a reference sensor for detecting a floor impact noise generated in the upper story and converting it to an electric signal; a speaker for emitting a sound wave for suppressing the floor impact noise; an error sensor for detecting an interference sound caused by interference between the floor impact noise and the sound wave emitted from said speaker and converting it to an electric signal; and a controlling means for computing, according to an adaptive control based on the electric signals each from said reference sensor and error sensor, a driving signal for emitting a sound wave adapted to eliminate the floor impact noise by means of negative phase interference from said speaker, said reference sensor being disposed in a periphery of a floor of the upper story or in any place from a bottom of the floor of the upper story to a bottom surface of a ceiling of the lower story; said speaker being disposed at a position lower than that where said reference sensor is disposed; and said error sensor being disposed. inside a room in the lower story.