Abstract: An active duct noise control system and a method thereof are provided, including a duct, a noise source speaker, a microphone, a plurality of noise-cancelling speakers, and a plurality of controllers. Wherein, the noise source speaker generates the primary noise, and the microphone is disposed to receive the residual noise. The plurality of noise-cancelling speakers are disposed between the noise source speaker and the microphone and respectively generate noise-cancelling audio frequencies to offset the primary noise and reduce the residual noise. The plurality of controllers are respectively connected to the plurality of noise-cancelling speakers and the noise source speaker and calculate each of the noise-cancelling audio frequencies generated by each of the plurality of noise-cancelling speakers according to the multi-channel inverse filtering principle.

Abstract: An active duct noise control system and a method thereof are provided, including a duct, a noise source speaker, a microphone, a plurality of noise-cancelling speakers, and a plurality of controllers. Wherein, the noise source speaker generates the primary noise, and the microphone is disposed to receive the residual noise. The plurality of noise-cancelling speakers are disposed between the noise source speaker and the microphone and respectively generate noise-cancelling audio frequencies to offset the primary noise and reduce the residual noise. The plurality of controllers are respectively connected to the plurality of noise-cancelling speakers and the noise source speaker and calculate each of the noise-cancelling audio frequencies generated by each of the plurality of noise-cancelling speakers according to the multi-channel inverse filtering principle.

Abstract: A binaural audio reproduction system is provided. The binaural audio reproduction system includes a speaker array and a filter matrix. The speaker array includes multiple speakers respectively disposed at multiple predetermined positions. The filter matrix outputs multiple driving signals to control the speakers, so as to produce a predetermined sound response to each of multiple control points within a control space. The driving signals of the filter matrix are determined according to a condition in reaching a match level between the sound response and a target sound response to be obtained at the control points from a virtual speaker array.

Abstract: An audio playback device is provided. The audio playback device includes a magnetic module, an annular armature, a coil module and a diaphragm. The magnetic module includes a magnetic source and two yokes each connected to one of two magnetic poles generated by the magnetic source and extends to form a magnetic field. The annular armature includes a first, a second, a third and a fourth arms that form a hollow area. At least part of the first arm is located in the magnetic area. The coil module is winded on the second arm and generates two varying electro-magnetic poles according to an alternating current data signal. The annular armature vibrates according to a relation of the two varying electro-magnetic poles and the magnetic field. The diaphragm is connected to the annular armature through a driving rod to vibrate according to the annular armature to generate a sound wave.

Abstract: An audio playback device is provided. The audio playback device includes a magnetic module, an annular armature, a coil module and a diaphragm. The magnetic module includes a magnetic source and two yokes each connected to one of two magnetic poles generated by the magnetic source and extends to form a magnetic field. The annular armature includes a first, a second, a third and a fourth arms that form a hollow area. At least part of the first arm is located in the magnetic area. The coil module is winded on the second arm and generates two varying electro-magnetic poles according to an alternating current data signal. The annular armature vibrates according to a relation of the two varying electro-magnetic poles and the magnetic field. The diaphragm is connected to the annular armature through a driving rod to vibrate according to the annular armature to generate a sound wave.

Abstract: An automotive virtual surround audio system is implemented in an automobile to receive left- and right-channel audio sources. A synthesizer receives the left- and right-channel audio sources to extend the sources into temporary rear-left and rear-right audio sources. A weighting device receives the left- and right-channel audio sources to perform a weighting operation and produce temporary front-left and front-right audio sources. A first filter receives the temporary front-left and front-right audio sources to perform a filtering operation and produce virtual front-left and front-right audio sources. A second filter receives the temporary rear-left and rear-right audio sources to perform a filtering operation and produce virtual rear-left and rear-right audio sources. Thus, the virtual audio image position is reproduced.

Abstract: A crosstalk cancellation system for preserving quality of sound and the parameter determining method thereof. The system can cancel a two-channel audio signal without compensating a frequency response of an ipsilateral HRTF. The method includes providing an audio signal input device for inputting the two-channel audio signal, modeling a relation between parameters of the crosstalk cancellation system and a head related transfer function (HRTF) to thereby obtain an output transfer impulse response, setting contralateral parts of the output transfer impulse response approximate to zero, setting ipsilateral parts of the output transfer impulse response equal to a delay of ipsilateral head related impulse responses (HRIRs) corresponding to the HRTF, and performing an inverse operation to compute the parameters of the crosstalk cancellation system.

Abstract: An automotive virtual surround audio system is implemented in an automobile to receive left- and right-channel audio sources. A synthesizer receives the left- and right-channel audio sources to extend the sources into temporary rear-left and rear-right audio sources. A weighting device receives the left- and right-channel audio sources to perform a weighting operation and produce temporary front-left and front-right audio sources. A first filter receives the temporary front-left and front-right audio sources to perform a filtering operation and produce virtual front-left and front-right audio sources. A second filter receives the temporary rear-left and rear-right audio sources to perform a filtering operation and produce virtual rear-left and rear-right audio sources. Thus, the virtual audio image position is reproduced.

Abstract: A crosstalk cancellation system for preserving quality of sound and the parameter determining method thereof. The system can cancel a two-channel audio signal without compensating a frequency response of an ipsilateral HRTF. The method includes providing an audio signal input device for inputting the two-channel audio signal, modeling a relation between parameters of the crosstalk cancellation system and a head related transfer function (HRTF) to thereby obtain an output transfer impulse response, setting contralateral parts of the output transfer impulse response approximate to zero, setting ipsilateral parts of the output transfer impulse response equal to a delay of ipsilateral head related impulse responses (HRIRs) corresponding to the HRTF, and performing an inverse operation to compute the parameters of the crosstalk cancellation system.

Abstract: The present invention relates to a smart system and method of performing high-resolution frequency order analysis/diagnosis on rotor, in which such system is characterized in that capable of performing order analysis via a Kalman filter or a RLS (Recursive Least Square) algorithm while determining the failure status based on the Fuzzy theory. The smart system of present invention comprises a data acquisition means, a bench data setup means, a STFT time-spectra analysis/re-sampled order tracking means, a Kalman filter or RLS algorithmic means, a fuzzy diagnosis means and a window interface (e.g., GUI) while repeatedly making use the functions of those means so as to achieve the real-time diagnosis on rotor.

Abstract: The present invention relates to a smart system and method of performing high-resolution frequency order analysis/diagnosis on rotor, in which such system is characterized in that capable of performing order analysis via a Kalman filter or a RLS (Recursive Least Square) algorithm while determining the failure status based on the Fuzzy theory. The smart system of present invention comprises a data acquisition means, a bench data setup means, a STFT time-spectra analysis/re-sampled order tracking means, a Kalman filter or RLS algorithmic means, a fuzzy diagnosis means and a window interface (e.g., GUI) while repeatedly making use the functions of those means so as to achieve the real-time diagnosis on rotor.