Abstract: A hearing aid device with functions of anti-noise and 3D sound recognition is disclosed. The hearing aid device comprises N microphones, at least one A/D converter, a modular electronic device, a D/A converter, and a loudspeaker. According to the present invention, the modular electronic device is configured for generating N second audio signals based on N first audio signals and a HRTF signal, and then summing up the N second audio signals to a reference signal. Moreover, the modular electronic device is further configured for generating a first output signal after applying an ANC process to the reference signal, converting the reference signal to a second output signal, and then generating an output signal based on the first output signal and the second output signal. Consequently, the loudspeaker broadcasts a sound according to the output signal.

Abstract: A design method for feedforward active noise control system is disclosed. Based on a target signal and a reference signal, a first adaptive system identifying unit is enabled to complete a first system identification process for producing a first adaptive filter, and then a second adaptive system identifying unit is enabled to complete a second system identification process for producing a second adaptive filter. After the second adaptive filter is converted to a digitally-controlled filter by using a system identification tool, the digitally-controlled filter is implemented into a DSP chip of a feedforward active noise control system. As a result, it is able to find that not only the computing loading of the DSP chip is significantly lowered while an adaptive algorithm executes an active noise control computing, but also the feedforward active noise control system exhibits a broad frequency bandwidth noise cancelling ability.