Abstract: A dynamic microphone unit includes a diaphragm vibrating in response to received sound waves; a voice coil fixed to the diaphragm; a magnetic circuit generating magnetism in a magnetic gap where the voice coil is disposed; and an acoustic resistor disposed in a space adjacent to the reverse of the diaphragm. The acoustic resistor includes a cover disposed between a felt and the diaphragm. A case having an open end and a closed end accommodates the felt and the cover. The cover has holes transmitting sound waves at the closed end and a bending portion at the open end which urges the cover and the felt.
Abstract: A digital microphone comprises a ?? modulator. The ?? modulator has a resonator including a membrane which vibrates by receiving a sound wave and a wiring pattern disposed opposite to the membrane, an oscillator, including the resonator, for outputting an FM signal according to the vibration of the membrane, and a one-bit quantizer for outputting a one-bit quantized signal by sampling the FM signal with a high-frequency clock.
Type:
Grant
Filed:
March 10, 2009
Date of Patent:
December 13, 2011
Assignees:
Kabushiki Kaisha Audio-Technica, National University Corporation University of Toyama
Abstract: An electrostatically operating electroacoustic transducer, operating as a sound receiver and configured to be mounted in a microphone capsule, has an electrode and a diaphragm connected to one another at a spacing from one another by a spacer ring, wherein on the electrode at least one first electric resistor is arranged which is connected to a power supply during operation of the microphone. The resistor is heated to prevent condensation of water vapor, and this improves the resistance of the microphone against ambient humidity.
Abstract: In accordance with the invention, a new type of microphone utilizes a magnetoresistive sensing element. Specifically, acoustical energy causes vibrations between a magnetoresistive element and a magnet, producing a variation in the resistance which can be used to convert an acoustical signal into a corresponding electrical signal.
Type:
Grant
Filed:
March 30, 1994
Date of Patent:
September 12, 1995
Assignee:
AT&T Corp.
Inventors:
Sungho Jin, Larry A. Marcus, Mark T. McCormack