Miniature electronic shotgun microphone

摘要

A miniature electronic shotgun microphone, which is used to receive a sound source from a specified direction, comprises a pick-up member, an A/D (Analog/Digital) conversion unit, and a digital signal processor. The pick-up member includes a first pick-up unit, a second pick-up unit separated from the first pick-up unit by a first distance, and a third pick-up unit separated from the second pick-up unit by a second distance; the first distance is greater than the second distance. The first pick-up unit, the second pick-up unit and the third pick-up unit respectively receive the sound source and output an analog signal. The A/D conversion unit and the digital signal processor process the analog signals, and convert them into a directional digital acoustic signal. Thus, the directional digital acoustic signal has a maximum pick-up frequency. Thereby is decreased grating lobes and spatial aliasing.

主权项

1. A miniature electronic shotgun microphone, which is used to receive a sound source from a specified direction, comprising:
a pick-up member including a first pick-up unit, a second pick-up unit separated from the first pick-up unit by a first distance D1, and a third pick-up unit separated from the second pick-up unit by a second distance D2, wherein the first pick-up unit, the second pick-up unit and the third pick-up unit receive the sound source and output analog signals; an analog/digital (A/D) conversion unit electrically connecting with the pick-up member, receiving the analog signals, and converting the analog signals into a first digital signal, a second digital signal, and a third digital signal; a low-pass filter, which is arranged between the pick-up member and the A/D conversion unit and electrically connected with the pick-up member and the A/D conversion unit; and a digital signal processor electrically connecting with the A/D conversion unit, receiving the first digital signal, the second digital signal and the third digital signal, and converting the first digital signal, the second digital signal and the third digital signal into a directional digital acoustic signal,wherein the first distance is greater than the second distance, andwherein the pick-up member has a maximum pick-up frequency higher than a pick-up frequency f expressed by an Equation off=cD⁢⁢1+D⁢⁢2,andwherein c is a sound speed, wherein the digital signal processor includes convex optimization software, which sets weights of the first digital signal, the second digital signal and the third digital signal.