US 2014/0112514 A1Published application

Variable directivity condenser microphone

AssigneeKabushiki Kaisha Audio-Technica

InventorSatoshi YOSHINO

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Abstract

A first diaphragm FD and a second diaphragm RD are respectively arranged across a fixed electrode BP at both sides to constitute the variable directivity condenser microphone. A microphone body 1 includes a vacuum tube Q1 for impedance converting an audio signal obtained at the fixed electrode, and a connector 2 provided with a hot side connector terminal and a cold side connector terminal through which the audio signal that is impedance converted by the vacuum tube is outputted in parallel. A means for supplying a polarization voltage applied to the second diaphragm RD from an external power supply circuit 3 is arranged such that the hot side connector terminal and the cold side connector terminal are used as a forward conductor and a ground connector terminal for the microphone body arranged at the connector is used as a return conductor.

Claims18

Dependent claims

A variable directivity condenser microphone in which a first diaphragm and a second diaphragm are arranged on opposite sides of a fixed electrode to provide two microphone units and directivity is varied by varying a polarization voltage applied to one of said microphone units with respect to a polarization voltage applied to the other microphone unit, wherein

a microphone body is provided with a vacuum tube for impedance converting an audio signal obtained at said fixed electrode and a connector having a hot side connector terminal and a cold side connector terminal through which an audio signal that is impedance converted by said vacuum tube is outputted in parallel,
a means for supplying a polarization voltage applied to one of said microphone from an external power supply circuit is arranged by using said hot side connector terminal and cold side connector terminal as a forward conductor, and
a ground connector terminal of the microphone body arranged at said connector is used as a return conductor.

Dependencies are inferred from the claim text.