31results about How to "Suppress wind noise" patented technology

Wind noise is detected in and removed from an acoustic signal. Features may be extracted from the acoustic signal. The extracted features may be processed to classify the signal as including wind noise or not. The wind noise may be removed before or during processing of the acoustic signal. The wind noise may be suppressed by estimating a wind noise model, deriving a modification, and applying the modification to the acoustic signal. In audio devices with multiple microphones, the channel exhibiting wind noise (i.e., acoustic signal frame associated with the wind noise) may be discarded for the frame in which wind noise is detected.

A hearing aid (100) having a microphone, a signal processing unit, an electrical-acoustical output transducer, a housing (101) and a wind shield cover (102) wherein the housing has a surface with a microphone inlet (112, 113), and the wind shield cover is adapted to be attached to the housing, to cover the microphone inlet, to provide for sound to be guided in a gap between the wind shield cover and the housing, hereby providing for the transmission of sound from the surroundings and to said microphone inlet, wherein a first dimension of a cross-section of the gap is in the range between 0.15 mm and 0.5 mm, and wherein the minimum distance, along the gap, from the microphone inlet and to the opening of the gap, towards the surroundings, is at least 1 mm.

A narrow directional microphone includes a unit case having a front end portion to which a microphone unit is mounted, and a side surface functioning as a grip, an acoustic tube formed of resin material in a tubular shape, covering the microphone unit, and attached to the front end portion of the unit case such that the microphone unit is positioned to an inner bottom portion of the acoustic tube, a piezoelectric film that is arranged in at least one part of the acoustic tube, and that generates a detection output based on a mechanical deformation of the acoustic tube, and an output signal processing unit including an attenuation circuit that attenuates an audio signal from the microphone unit with the detection output from the piezoelectric film and sends the attenuated audio signal to a signal output unit.

A hearing aid (100) having a microphone, a signal processing unit, an electrical- acoustical output transducer, a housing (101) and a wind shield cover (102) wherein the housing has a surface with a microphone inlet (112, 113), and the wind shield cover is adapted to be attached to the housing, to cover the microphone inlet, to provide for sound to be guided in a gap between the wind shield cover and the housing, hereby providing for the transmission of sound from the surroundings and to said microphone inlet, wherein a first dimension of a cross-section of the gap is in the range between 0.15 mm and 0.5 mm, and wherein the minimum distance, along the gap, from the microphone inlet and to the opening of the gap, towards the surroundings, is at least 1 mm.

The invention discloses an electronic product capable of attenuating microphone noise. The electronic product comprises a microphone and a shell, wherein the shell is provided with a plurality of sound inlet holes; one independent audio transmission channel is formed between each sound inlet hole and the microphone respectively; the length of each audio transmission channel is larger than a vertical distance between the microphone and the shell; the audio transmission channels construct a front cavity of the microphone together; the equivalent acoustic capacitance Ca of the front cavity is less than or equal to Co; and Co is acoustic capacitance being equivalent to the volume of the front cavity determined according to the requirements of the high frequency cut-off frequency of a microphone monomer and the application scenario of the electronic product on high frequency cut-off frequency. Through special design of the front cavity of the microphone, the noise protection performance ofthe electronic product is improved on the premise of ensuring high-frequency response performance of the microphone.

The invention provides a fan system and a sound suppression method thereof. A fan system is used for dissipating heat of an electronic device. The fan system includes a fan, a hollow structure, and acontrol circuit. Sound waves made by the fan are transmitted to an interior of the hollow structure when the fan is operating. The control circuit is connected to the hollow structure and is configured to control deformation/deformations of the hollow structure according to a state/states of the fan and/or the electronic device, which change a volume of the interior of the hollow structure for making a resonance frequency of the hollow structure being approximate to a rotation speed of the fan or being the same as the rotation speed of the fan. The provided fan system can make the resonance frequency of the hollow structure to be approximate to/be the same as a rotation speed of the fan so as to reduce the sound generated by the rotation of the fan; or the circuit is controlled to properlyadjust the thickness of the body, the distance between the fan and the bottom of a groove can be maintained at a proper value so as to inhibit the wind shear sound.

A blow-off device (10) is equipped with a wind direction variable means (40) and a pressure adjustment unit (60) in a ventilation passage (50). The wind direction variable means is rotatably provided in the ventilation passage and can change a conditioned air from the inflow port (50c) toward a blow-off port (50d) and a second inclined part (52r) along an intermediate part (53r). The pressure adjustment unit prevents the pressure of the ventilation passage from exceeding a predetermined value by releasing the conditioned air to the outside of the ventilation passage. A bypass inlet (66) of the pressure adjustment unit is provided on an upstream side of an end portion (42d) in a +X direction at the time of maximum rotation of the wind direction variable means.

The purpose of the present invention is to provide a speaker arrangement structure for a vehicle, the speaker arrangement structure being capable of transmitting sound (port playback sound) that is played out from a port opening to a cabin, suppressing the falling of mud or water on the port opening, and suppressing the generation of wind noise caused by the flow of air exiting from the port opening. In the speaker arrangement structure, a port opening portion (46) communicating with internal spaces (S2, S3, S4) of the speaker box (40) is provided in a front side surface portion (42i) of the speaker box (40) to form a space portion (70) surrounded by the front side surface portion (42i) of the speaker box (40), the dash panel (37), the hinge column (30), and the partition member (50), and the space portion (70) communicates with a passenger space above or below the space portion (70). The size (L2) of the space (70) in the front-rear direction from the port opening (46) is set to be at least larger than the maximum size (L1) of the port opening (46).

The invention discloses a wind noise suppression method and device based on multiple microphones. The method comprises the following steps that S1, microphone signals are selected to be output according to the low-frequency energy of all microphones; s2, suppressing the wind noise frequency point of the output microphone signal according to the energy magnitude relationship between each frequency point of the output microphone signal and each frequency point of other microphone signals; and S3, carrying out difference on signals of the main microphone and other microphones, taking low-frequency signals to carry out wind noise detection and wind noise magnitude estimation, and carrying out wind noise suppression in combination with a wind noise continuity characteristic.