Abstract: An active noise reduction system (2) comprising an electroacoustic plasma transducer (5) for mounting in an installation structure and an acoustic sensing system (11). The electroacoustic plasma transducer comprises a plasma electrode arrangement (6) including a collector electrode (8) and a corona electrode (9), and a control system (7) connected to the plasma electrode arrangement for supplying power to the plasma electrode arrangement. The control system comprises a controller (12), and a amplification circuit (13). The acoustic sensing system is connected to the control system providing a measurement signal of an environmental sound to control the output of the electroacoustic transducer for reducing noise. The control system comprises a filter implementing a control transfer function ?(?) based on a model of the electroacoustic plasma transducer.

Abstract: An active noise reduction system (2) comprising an electroacoustic plasma transducer (5) for mounting in an installation structure and an acoustic sensing system (11). The electroacoustic plasma transducer comprises a plasma electrode arrangement (6) including a collector electrode (8) and a corona electrode (9), and a control system (7) connected to the plasma electrode arrangement for supplying power to the plasma electrode arrangement. The control system comprises a controller (12), and a amplification circuit (13). The acoustic sensing system is connected to the control system providing a measurement signal of an environmental sound to control the output of the electroacoustic transducer for reducing noise. The control system comprises a filter implementing a control transfer function ?(?) based on a model of the electroacoustic plasma transducer.

Abstract: There is provided a hearing assistance system, comprising a transmission unit comprising a microphone arrangement for capturing audio signals from a voice of a speaker using the transmission unit and being adapted to transmit the audio signals as radio frequency signal via a wireless RF link; a left ear hearing device and a right ear hearing device, each hearing device being adapted to stimulate the user's hearing and to receive an RF signal from the transmission unit via the wireless RF link and comprising a microphone arrangement for capturing audio signals from ambient sound.

Abstract: There is provided a hearing assistance system, comprising a transmission unit comprising a microphone arrangement for capturing audio signals from a voice of a speaker using the transmission unit and being adapted to transmit the audio signals as radio frequency signal via a wireless RF link; a left ear hearing device and a right ear hearing device, each hearing device being adapted to stimulate the user's hearing and to receive an RF signal from the transmission unit via the wireless RF link and comprising a microphone arrangement for capturing audio signals from ambient sound.

Abstract: A portable voice capture device having an orientable arm comprising a first leg and a second leg, the first leg and the second leg having different orientations, the first leg of the first arm comprising a first differential linear array of microphones, a directivity of the first differential linear array being arranged for improved sensing of voice from a user, the second leg of the arm comprising a second differential linear array of microphones, a directivity of the second differential linear array being arranged for improved sensing of noise from a different than the direction of said sensed voice, and a noise reduction circuit for providing a voice signal with reduced noise, based on the output of the first array and on the output of the second array.

Abstract: A portable voice capture device comprising: an orientable arm with a first differential array of microphones comprising at least one pair of microphones, the directivity of said first array being arranged for sensing voice from a first direction depending on the orientation of said arm; a second differential array of microphones comprising at least one pair of microphones, the directivity of said second array being arranged for sensing noise from a second direction different from the first direction; a noise reduction circuit for providing a voice signal with reduced noise, based on the output of said first array and on the output of said second array.

Abstract: A videoconference terminal comprises image restoring means having a display arranged substantially horizontally. The terminal preferably has the shape of a well seat closed at one end by the display, thereby enabling a large number of users to distribute the space around the display. This makes the terminal an original and convivial communication equipment dedicated to informal communications between users distant from one another.

Abstract: The invention concerns a videoconference terminal (1, 2) comprising image restoring means comprising a display (10, 20) arranged substantially horizontally, and preferably having the shape of a well seat closed at one of its end by the display (10, 20), thereby enabling a large number of users to distribute the space around the display, and to make the terminal an original and convivial communication equipment dedicated to informal communications between users distant from one another.