US 7,580,735 B2
Condenser microphone
Hiroshi Akino, Machida (Japan)
Assigned to Kabushiki Kaisha Audio-Technica, Machida-Shi, Tokyo (Japan)
Filed on May 16, 2005, as Appl. No. 11/129,306.
Claims priority of application No. 2004-147327 (JP), filed on May 18, 2004.
Prior Publication US 2005/0261039 A1, Nov. 24, 2005
Int. Cl. H04M 1/00 (2006.01)
U.S. Cl. 455—575.1  [455/137; 455/575.5; 455/149; 381/384; 381/369; 381/355; 381/620.11; 381/113] 4 Claims
OG exemplary drawing
 
1. A condenser microphone in which a microphone capsule and an output module section are connected to each other via a microphone cord composed of a twin-core shield covered wire, the microphone capsule including a condenser microphone unit and an impedance converter, the output module section storing, in a shield case, a circuit board including a voice output circuit,
wherein the shield covered wire of the microphone cord is connected to the shield case, and the shield covered wire is also connected to a ground circuit of the circuit board via a high-frequency choke coil,
wherein the shield case comprises an output connector which includes a ground pin and two signal pins and is connected to an external power source, and the ground pin is connected to the shield case, and the ground circuit of the circuit board via a high-frequency choke coil.