US 5,862,240 A · Microphone device

Abstract

A microphone device is of a structure comprising at least three microphone elements disposed in the state spaced by predetermined distances in a direction perpendicular to the main axis of directivity, and an adder for adding output signals from the respective microphone elements. In this case, the microphone elements are respectively comprised of uni-directional microphone elements, and are disposed in the state where the sound collection surfaces are directed in the same direction with respect to the sound source and at substantially equal intervals. This microphone device realizes sharp directivity in the middle pitched tone (sound) region (range) required for the input means of the speech recognition equipment, and realizes sound collection which has high sensitivity with respect to speech (voice) input from the front and has extremely less noise components inputted from the side surfaces (lateral direction).

Claims7

Dependent claims

A microphone device, comprising:

three directional microphone elements disposed in a substantially horizontal linear array on sound absorbing mounting means forming a first vertical plane, whereby adjacent ones of the three microphone elements are separated by a single predetermined distance, each of the three microphone elements is directed to a sound source, and three sound receiving faces, each corresponding to one of the three microphone elements, form a plane parallel to the first vertical plane formed by the sound absorbing mounting means, said plane parallel to the first vertical plane being between the first vertical plane and the sound source;
and
adding means for adding output signals from respective ones of the three microphone elements;
wherein each of the three microphone elements includes a vibrating plate;
and
wherein the first vertical plane is in parallel to a second vertical plane formed by the vibrating plates.

3 more elements

Dependencies are inferred from the claim text.

Microphone device

Life of this patent

Microphone device

Life of this patent

Abstract

Claims7