Patent ID: 9148723
Filing Date: 2015-09-29
Classification: H04R

Abstract:
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 D 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, and wherein the pick-up member has a maximum pick-up frequency higher than a pick-up frequency f expressed by an Equation of and wherein 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.