Noise reduction method and remote directional pickup microphone

The invention relates to the technical field of pickup equipment, in particular to a noise reduction method, which comprises the following steps of: performing pickup by adopting a heart-shaped microphone over against a sound source to obtain an audio to be processed; amplifying the to-be-processed audio by a predetermined multiple according to the distance of the sound source, and converting the to-be-processed audio into a digital signal to obtain an initial audio; performing time-domain analysis on the initial audio to obtain time-domain characteristics, converting the initial audio into a frequency domain through Fourier transform, performing frequency-domain analysis to obtain frequency-domain characteristics, and performing characteristic extraction on the initial audio based on the frequency-domain characteristics and the time-domain characteristics to obtain audio characteristics; selecting the type of a filter according to the audio characteristics and application requirements, and adjusting the para