Condenser microphone

Details Condenser microphone Condenser microphone

2005-05-12

2009-06-02

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

C381S111000, C381S120000, C381S375000

Reexamination Certificate

active

07542578

ABSTRACT:
The DC magnetization of a transformer core is prevented without increasing the size of an output transformer in a condenser microphone which is operated by a phantom power source, uses a vacuum tube as an impedance converter, and outputs a vacuum tube signal via the output transformer. The condenser microphone includes a condenser microphone capsule MC, a vacuum tube V01used as an impedance converter, and an output transformer TRS having a primary winding F connected to the plate and screen grid of the vacuum tube V01and a secondary winding S connected to the phantom power source via an output connector, wherein the primary winding F has a center tap CF and both ends of the secondary winding S are connected to the center tap CF via constant current diodes D04and D05, respectively.

REFERENCES:
patent: 4211893 (1980-07-01), Smith
patent: 5459792 (1995-10-01), Reichel et al.
patent: 6285769 (2001-09-01), Edelson et al.
patent: 7046815 (2006-05-01), Akino et al.
patent: 7295675 (2007-11-01), Akino et al.

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