Unidirectional microphone

Patent metadata

Field	Value
Publication number	US-9980039-B2
Application number	US-201615388488-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Jan 6, 2016
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

To obtain a unidirectional microphone with high sound quality, which achieves unidirectivity while preventing deterioration in sound quality of a ribbon microphone. A unidirectional condenser microphone and bi-directional ribbon microphones are included, and the unidirectional condenser microphone and the bi-directional ribbon microphones are disposed such that a 0° direction of a sound collecting axis of the unidirectional condenser microphone accords with a 180° direction of sound collecting axes of the bi-directional ribbon microphones, and an output of the unidirectional condenser microphone is subtracted from an output of the 180° direction of the bi-directional ribbon microphones.

First claim

What is claimed is:

1. A unidirectional microphone comprising:
a unidirectional condenser microphone; and
a bi-directional ribbon microphone,
wherein the unidirectional condenser microphone and the bi-directional ribbon microphone are arranged such that a 0° direction of a sound collecting axis of the unidirectional condenser microphone accords with a 180° direction of a sound collecting axis of the bi-directional ribbon microphone, and
an output of the unidirectional condenser microphone is subtracted from an output of the 180° direction of the bi-directional ribbon microphone, and only the bi-directional ribbon microphone has a sensitivity for a sound wave from the 0° direction of the sound collecting axis of the bi-directional ribbon microphone.

2. The unidirectional microphone according to claim 1 , wherein the bi-directional ribbon microphone includes two bi-directional ribbon microphones disposed laterally symmetric to the unidirectional condenser microphone.

3. The unidirectional microphone according to claim 2 , wherein the output of the unidirectional condenser microphone and outputs of the bi-directional ribbon microphones are outputted as a balanced output.

4. The unidirectional microphone according to claim 1 , wherein the bi-directional ribbon microphone includes two bi-directional ribbon microphones arranged in parallel to each other, and the condenser microphone is arranged between the two bi-directional ribbon microphones.

Assignees

• Audio Technica Kk

Inventors

• Akino Hiroshi

Classifications

• H04R1/326 Primary

  for microphones (H04R1/34 and H04R1/40 take precedence) · CPC title

• H04R23/02

  Transducers using more than one principle simultaneously · CPC title

• H04R3/005

  for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407) · CPC title

• H04R9/048

  of the ribbon type · CPC title

• H04R2430/25

  Array processing for suppression of unwanted side-lobes in directivity characteristics, e.g. a blocking matrix · CPC title