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183 results about "Acoustic response" patented technology

In-Ear Digital Electronic Noise Cancelling and Communication Device

A noise canceling and communication system is described. An in-ear device is adapted to fit in the ear canal of a device user. A passive noise reduction element reduces external noise entering the ear canal. An external microphone senses an external acoustic signal outside the ear canal to produce a representative external microphone signal. An internal microphone senses an internal acoustic signal proximal to the tympanic membrane to produce a representative internal microphone signal. One or more internal sound generators produce a noise cancellation signal and an acoustic communication signal, both directed towards the tympanic membrane. A probe tube shapes an acoustic response between the internal sound generator and the internal microphone to be relatively constant over a wide audio frequency band. An electronics module is located externally of the ear canal and in communication with the in-ear device for processing the microphone signals using a hybrid feed forward and feedback active noise reduction algorithm to produce the noise cancellation signal. The noise reduction algorithm includes a modeling component based on a transfer function associated with the internal sound generator and at least one of the microphones to automatically adjust the noise cancellation signal for fit and geometry of the ear canal of the user. The communication component also includes a modeling component based on a transfer function associated with the internal sound generator and at least one of the microphones to automatically adjust the communication signal for fit and geometry of the ear canal of the user and to assure that the communication signal does not interfere with the noise reduction algorithm and that the noise cancellation signal does not interfere with passing of the communication signal.
Owner:SOUND INNOVATIONS

Car body sound vibration roughness NVH design method based on low frequency acoustic sensitiveness inside vehicle

The invention relates to a method for designing the automobile body acoustic vibration unevenness NVH based on a low frequency automobile acoustic sensitivity. The method comprises the following steps: firstly, establishing a body-in-white finite element modeling, and establishing an acoustic finite element modeling for a cab on the basis of the body finite element modeling; secondly, carrying the frequency response analysis on the positions of a suspending point of an engine on the automobile body, a suspension mounting point, an exhaust hanging point, and the like; thirdly, taking the vibration speed of a body wall plate obtained by the frequency response analysis as a boundary condition, and the sound pressure level beside ears of a driver by solving the acoustic response of the cab; further, the influence level of larger sheet metal parts and mounting points which have great influence on the sound pressure level are acquired by checking the vibration situation of the body wall plate displayed by the frequency response analysis result at higher sound pressure response frequency points, and analyzing the sheet metal contribution; and finally, amending the design proposal of the sheet metal parts and the design proposal of the local rigidity of the mounting points.
Owner:CHERY AUTOMOBILE CO LTD
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