Showing papers on "Microphone array published in 1989"

Sound collecting device

Abstract: PURPOSE:To collect sound with a small noise component by arranging a main acoustic input means and plural subordinate acoustic input means at respective necessary positions and erasing acoustic signals of the subordinate acoustic input means from an acoustic signal of the main acoustic input means. CONSTITUTION:A microphone 21 as the main acoustic input means is arranged nearby on a microphone array plate 11 nearby a object sound source of sound collection and microphones 22 - 28 as the subordinate acoustic means are arranged at distributed positions around the microphone 21. An electric signal corresponding to the main sound outputted by the microphone 21 is processed by an A/D converter and an adaptive filter and electric signals corresponding to subordinate sounds from the microphones 22 - 28 are processed similarly; and the total of the subordinate sound processed data is subtracted from the main sound processed data to realize small-noise, high-quality sound collection.

A microphone array system for speech recognition

Abstract: The ultimate speech recognizer cannot use an attached or desk-mounted microphone. Array techniques offer the opportunity to free a talker from microphone incumberance. My goal is to develop algorithms and systems for this purpose.

Noise measuring apparatus

Abstract: PURPOSE:To analyze the distribution of the sound pressure of a sound source and sound vector instantaneously together, by constituting each element of an acoustic microphone array with three-axis intensity probes, and measuring the sound vector. CONSTITUTION:A microphone array 12 is arranged at the central part of a parabola sound collector and receives the sound image, which is acoustically formed with the sound collector. In this array, each microphone element 25 is constituted with three-axis sound intensity probes 26. A plurality of the elements 25 are arranged in one line in the array 12. A plurality of the lines of the element 25 are arranged. In this constitution, the intensity of the sound emitted from a material to be measured, is received into each element 25 in the array 12, which is arranged at the image forming plane of the sound collector as a sound signal. The sound image at the surface of the array 12 is recorded. The sound image and the image of the material to be measured from a video camera, which is attached to the central part of the sound collector, are superimposed and displayed on a CRT. In this way, an equal sound pressure diagram is formed, and the sound can be observed in real time.