SOUND RECEIVING DEVICE

摘要

A sound receiving device is disclosed, including a microphone array, a plurality of time delay circuits and a sound-mixing output device, wherein the microphone array includes a plurality of microphones longitudinally arranged along a straight line in order, two adjacent microphones in the microphone array are separated with a distance of;1nλ0;;in the microphone array, an output terminal of each microphone is connected with a time delay circuit, and an output terminal of the time delay circuit is connected to an input terminal of the sound-mixing output device; and an i-th time delay circuit has a delay time Ti defined by adding a (n−i) times of unit time to a delay time of a last time delay circuit. The present invention can increase the output of the forward acoustic wave actuation, decrease the output of the oblique acoustic wave within a certain frequency bandwidth, and obtain nearly the same directional characteristic at the central frequency and adjacent frequencies. The present invention as a sound receiving device can be widely used in sound pickup (sound transmitting) applications.

主权项

1. A sound receiving device, comprising a microphone array, a plurality of time delay circuits and a sound-mixing output device, wherein the microphone array comprises a plurality of microphones longitudinally arranged along a straight line in order, two adjacent microphones in the microphone array are separated with a distance of1nλ0,where n is the total number of the microphones in the microphone array and λ0 is a wavelength derived from a preset center frequency;
in the microphone array, an output terminal of each microphone is connected with a time delay circuit, and an output terminal of the time delay circuit is connected to an input terminal of the sound-mixing output device; an i-th time delay circuit has a delay time Ti defined by adding a (n−i) times of unit time to a delay time of a last time delay circuit, where said unit time is a time for an acoustic signal with a frequency set at a given center frequency to travel between two adjacent microphones after the acoustic signal axially transmitting into the microphone array, n is the total number of the microphones in the microphone array, and i has a value of 1, 2, 3, . . . , or n; and the total number n of the microphones in the microphone array is an integer greater than or equal to 3.