High directivity boundary microphone

摘要

A high directivity boundary microphone (10) is disclosed, build up of a normal unidirectional microphone element (12) with cardioid-directivity behavior. The microphone element (12) is placed on a holder plate (14), with a membrane (16) of the microphone element (12) facing a plane (18) where a holder (20), comprising the holder plate (14) and a holder feet (22), is placed upon. The holder (20) ensures that the microphone element (12) is aligned at an angle (24) of preferably 35° respective to the plane (18). In this position, the microphone element (12) can detect direct sound (26) in a defined speech area (28A, 28B) as well as delayed sound (30) that is reflected at the plane (18) beneath the microphone element (12). Outside the defined speech area (28A, 28B) the sensitivity is strongly reduced.

主权项

1. A high directivity boundary microphone (10) comprising at least one unidirectional microphone element (12) and a holder (20), the holder comprising a holder plate (14) and a holder foot (22), the microphone element (12) being positioned flush into the holder plate (14), wherein the holder (20) is placed on a plane (18), the angle (24) between the holder plate (14) and the plane (18) being between 30° and 40°, and the microphone element (12) being placed as close as possible to a corner (40) formed by the holder plate (14) and the plane (18), wherein the holder plate (14) is dimensioned so that sound will be delayed when it travels from front to rear such that the directivity of the at least one microphone element (12) is increased.