Title:
DIRECTIONAL MICROPHONE
Document Type and Number:
Japanese Patent JPS58142697
Kind Code:
A
Abstract:
PURPOSE: To miniatuarize a microphone and simplify the circuit, by reversing the phase of two single directional condenser microphone cartridge, connecting them in parallel, subtracting the change of composite capacity and outputting.
CONSTITUTION: A phase circuit consists of two single directional condenser microphone cartridges. Capacity between a front fixed electrode 15 and a diaphragm electrode 16 is used in one of microphone cartridges. Capacity between a rear fixed electrode 17 having a sound phase-shifting circuit 18 in the rear and the diaphragm electrode 16 is used in another microphone cartridge. These capacities are connected in parallel and subtracted.
Inventors:
SHIMADA TOSHIYUKI
Application Number:
JP2530582A
Publication Date:
August 24, 1983
Filing Date:
February 18, 1982
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H04R1/40; H04R3/00; (IPC1-7): H04R1/40; H04R3/00
Attorney, Agent or Firm:
Toshio Nakao