Showing papers on "Microphone array published in 1985"
TL;DR: In this article, the authors describe a transducer system that discriminates against sound arrivals from all directions except for that of the desired source, using a two-dimensional array of microphones.
Abstract: The quality of sound pickup in large rooms—such as auditoria, conference rooms, or classrooms—is impaired by reverberation and interfering noise sources. These degradations can be minimized by a transducer system that discriminates against sound arrivals from all directions except for that of the desired source. A two‐dimensional array of microphones can be electronically beam steered to accomplish this directivity. This report gives the theory, design, and implementation of a microprocessor system for automatically steering a two‐dimensional microphone array. The signal‐seeking transducer system is implemented as a dual‐beam, “track‐while‐scan” array. It utilizes signal properties to distinguish between desired speech sources and interfering noise. The complete automatic system has been tested in anechoic and medium‐sized auditorium environments, and its performance is discussed.
484 citations
Patent•
23 Jan 1985
TL;DR: In this paper, an image forming device and a sound collector are installed facing a sound source body and the 1st and the 2nd images are put in focus, associatively and then one image is focused automatically by focusing only the other image.
Abstract: PURPOSE: To easily obtain a superimposed image by forming and displaying an object image as the 1st image by a normal optical method, detecting only distribution information on invisible observation elements which can not be image-formed by a detecting device, and visualizing and displaying it as the 2nd image by the 2nd image display device and superimposing this 2nd image upon the 1st image. CONSTITUTION: An image forming device 2 and a sound collector 3 are installed facing a sound source body 1 and the 1st and the 2nd images are put in focus. The focusing of the 1st image by the image forming device 2 is carried out by operating a lens barrel 12 and the focusing of the 2nd image, on the other hand, is attained by installing a microphone array 4 constituting the detecting device at the sound image formation position of reflected sound from the sound collector 3. Namely, the microphone array 4 is moved to and away from the reflecting surface of the sound collector 3 and positioned 4 where the quantity of light from a light emitting diode array 21 is maximum. Then, the 1st and the 2nd images are focused associatively and then one image is focused automatically by focusing only the other image. COPYRIGHT: (C)1986,JPO&Japio
2 citations