Abstract:
본 발명은 배관을 통해 전파되는 소음을 줄이기 위해 설치되는 소음저감장치에 관한 것으로서, 상기 배관에 설치되는 각기 다른 주파수영역을 갖는 복수의 공명기를 포함하고, 이 공명기가 배관의 길이방향(직렬)과 둘레방향(병렬)으로 배치된 공명기배열을 이용한 소음저감장치이다. 이 소음저감장치는 광범위한 주파수영역의 소음을 제거할 수 있는 효과가 있다.
Abstract:
PURPOSE: A system and method for forming acoustically bright and dark zones using plural speakers are provided to playback an optimal acoustic signal by maximizing or minimizing acoustic pressure levels for each of the acoustically bright and dark zones. CONSTITUTION: A system for forming acoustically bright and dark zones includes a plurality of speakers, a poly-channel signal generator, a microphone array, and a poly-channel signal analyzer. The speakers are driven by a power amplifier. The poly-channel signal generator generates synchronized input signals to the speakers. The microphone array detects sound signals outputted from the speakers at plural detecting points. The poly-channel signal analyzer simultaneously detects the input signal of the microphone array and the output signal of the poly-channel signal generator, calculates a transfer function between the input and output signals, and controls a sound source signal by using an optimal solution.
Abstract:
본 발명은 이동하는 소음원으로부터 방사되는 협대역 소음의 홀로그램(hologram)을 이용하여 음향특성을 영상화하는 시스템 및 방법과, 이동하는 운송기계의 측면 및 하부 소음원에 대한 홀로그램을 측정하여 소음원의 변화 양상을 감지함으로써, 운송기계의 운전 중 비접촉 상태에서 운송기계를 진단 및 모니터링하는 시스템 및 방법에 관한 것이기도 하다. 본 발명에 따른 협대역 소음을 영상화하는 방법은, 기준 위치에서 소음원으로부터 방사되는 협대역 소음의 전체 대역( f h )과 중심 주파수( f hc )에서의 스펙트럼을 구하는 제 1 단계와, 측정 위치에서 상기 소음원으로부터 방사되는 소음의 음압( p m )을 측정하는 제 2 단계, 상기 협대역 소음의 전체 대역에서의 스펙트럼과 중심 주파수에서의 스펙트럼과의 비를 구하는 제 3 단계, 및 상기 제 2 단계에서 측정된 소음의 음압에서 상기 제 3 단계에서 구한 스펙트럼 비에 의한 음압을 나누어 협대역 소음의 홀로그램을 얻고 그것을 영상화하는 제 4 단계를 포함한다. 또한, 본 발명에 따른 운송기계의 상태 모니터링 시스템은, 운송기계가 지나가는 경로의 임의의 위치에 상기 운송기계의 하부면 및 측면으로부터 일정 거리만큼 이격되고, 각각의 면에 평행하게 설치되어 상기 운송기계로부터 방사되는 협대역 소음의 음압을 측정하는 하부면 및 측면 마이크로폰 어레이와; 상기 운송기계에 부착되어 상기 운송기계로부터 방사되는 협대역 소음의 전체 대역에서의 스펙트럼과 중심 주파수에서의 스펙트럼을 측정하는 기준 마이크로폰과; 상기 소음의 전체 대역에서의 스펙트럼과 중심 주파수에서의 스펙트럼과의 비를 구하고 상기 하부면 및 측면 마이크로폰 어레이에서 측정한 소음의 음압에서 상기 스펙트럼의 비에 의한 음압을 나누어 소음의 홀로그램을 구하여 영상화하는 신호 처리수단과; 상기 운송기계의 정상상태와 비정상상태의 주행 중 소음지도를 저장한 저장수단과; 상기 운송기계의 소음의 홀로그램을 상기 저장수단에 저장된 소음지도에서 검색하여 상기 운송기계의 상태를 모니터링하는 검색수단을 포함한다.
Abstract:
PURPOSE: A system and a method for imaging narrow-band noise, system and method for monitoring the state of a transport machine using the system and method are provided to visualize a moving noise source generating narrow-band noise and to monitor the state of the transport machine in real time in a noncontact state. CONSTITUTION: A narrow-band noise imaging system includes bottom and side microphone arrays(1,3), a reference microphone(4), and a signal processor(8). The microphone arrays measure a sound pressure of narrow-band noise that is emitted from a transport machine. The reference microphone is attached to the transport machine to measure the spectrum of the entire band of the narrow-band noise and the spectrum of the center frequency of the noise. The signal processor calculates the ratio of the spectrum of the entire band to the spectrum of the center frequency and divides the sound pressure measured by the microphone arrays by a sound pressure according to the ratio to obtain noise hologram so as to image the noise.
Abstract:
The present invention relates to a hearing aid apparatus for visually presenting the direction of a sound source, and a driving method of the hearing aid apparatus and visually represents the direction of the sound source by turning on an LED corresponding to the direction of the estimated sound source by estimating a sound pressure signal received from a microphone the direction of the sound source in real time using the delay-sum beam formation method. In addition, people who wear the hearing aid apparatus can avoid separation from other people by manufacturing the hearing aid apparatus as glasses. The hearing aid apparatus comprises a plurality of microphones, a plurality of light emitting devices, and a control unit capable of controlling the direction of the sound source in order to visually indicate the direction in real time by turning on the light emitting device corresponding to the estimated direction, by estimating the direction of the maximum beam power, by comparing the size of the beam power obtained from the respective directions, by calculating the beam power and the beam output in the respective direction after dividing the all directions according to the predetermined angle based on a wearer. [Reference numerals] (AA) Start;(BB) No;(CC) Yes;(S10) Obtain a sound pressure signal;(S20) Calculate a sound pressure level (SPL) from the measured sound pressure signal and set a threshold value (SPL_0);(S40) Operate a delay-sum beam forming algorithm motion;(S50) Calculate beam output and beam power from each direction;(S60) Estimate the direction of the maximum beam power as the direction of a sound source;(S70) Turn on an LED corresponding to the estimated direction
Abstract:
The present invention relates to a sound wave incident direction estimating method using a domain concept and the sound wave incident direction estimating method obtains a model which represents each area by dividing a whole estimating space in which a user defines into an area and reduces calculation amounts than the existing method through a method which repeatedly performs a process comparing a correlation between the model and a received sound pressure signal and estimates the incident direction of a sound wave or the range of a position in which a sound source exist. The sound wave incident direction estimating method using the domain concept of the present invention comprises; a step which arranges multiple microphones (a); a step in which one or more sound pressure signals are inserted to the multiple microphone arrangements from an arbitrary direction (b); a step which estimates that the incident direction of the sound wave exists within an area having a large value by dividing a whole area defined by a user into at least two areas for estimating an incident direction of the sound pressure signal and comparing relative size of the sound pressure signal, a weighted value, and space average beam power at each area (c); a step which estimates that the incident direction of the sound wave exists within an area having a large value by dividing the area which is estimated that the incident direction of the sound wave exists into at least two areas and comparing relative size of the sound pressure signal, the weighted value, and the space average beam power at each area (d); a step which estimates that an area under a predetermined range is a range of the incident direction of the sound wave by repeatedly performing the (d) step until the area becomes under the predetermined range (e). [Reference numerals] (AA) W_R^(I) and W_L^(I) deduction, P measurement;(BB) Estimated range for sound wave incidence: [첩_R,첩_L]
Abstract:
본 발명의 음향 재생 장치는, 제1 및 제2 음원 신호를 받아, 청취 공간 중 특정의 위치에서 음압레벨이 특정위치 이외의 영역에서의 음압레벨보다 높도록 제1 및 제2 음원 신호의 크기와 위상을 제어하여, 제1 및 제2 제어 음원 신호를 출력하는 제어 수단; 제1 제어 음원 신호를 받아 음향을 재생하는 제1 스피커; 및 제2 제어 음원 신호를 받아 음향을 재생하는 제2 스피커를 포함하고, 특정의 위치는 청취자로부터 떨어져 있다.
Abstract:
PURPOSE: A sound reproducing apparatus is provided to provide an optimal acoustic environment suitable for a user by reproducing sound having desired spatial characteristics in a listening area. CONSTITUTION: A control means reproduces sound at a specific location in a listening area by receiving first and second sound source signals. The control means outputs the first and second sound source signals by controlling the size and phase of the first and the second source signals. A first speaker reproduces sound by receiving a first control sound source signal. A second speaker reproduces the sound by receiving a second control sound source signal. An input means displays a specific location in the listening area and the location of a listener. The input means is formed into a touch panel.
Abstract:
PURPOSE: A sound reproducing device is provided to grasp a transfer function considering features of a sound space, thereby enabling a user to obtain a sound signal optimized for generating a listening area. CONSTITUTION: The higher a sound pressure level of a listening area is than other areas except for the listening area, the more first, second, and third control sound signals a control unit outputs by controlling the amplitudes and phases of the first, second, and third sound signals. A first speaker(111) reproduces a sound by receiving the first control sound signal. A second speaker(112) reproduces a sound by receiving the second control sound signal. A third speaker(113) reproduces a sound by receiving the third control sound signal.