The present invention receives the sounds of the outside and two or more microphones to generate analog sound signals, each microphone is coupled to, and more than one A / D converter for converting analog sound signals to digital sound signals, A / D converter receives the digital sound signal from the sound of separating the digital audio signal and the digital noise signal by using the signal processing algorithm signal separation unit, a digital audio signal to a frequency characteristic amplifier according to a preset frequency-dependent amplification conditions and the amplification section, the amplified output and outputting a digital audio signal to the D / A converter for converting the analog audio signal into an analog voice signal parts relates to a digital hearing aids and noise removal method with a noise-canceling feature that contains, so that even in noisy environments, the patient wears a hearing aid can be provided only as an optional audio signal.
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