Patent ID: 7519175
Filing Date: 2009-04-14
Classification: H04R

Abstract:
1. An integral microphone and speaker configuration type two-way communication apparatus comprising: a speaker directed to a substantially vertical direction; a speaker housing having the speaker built in and an upper sound output opening for emitting the sound of the speaker at a center perpendicular portion and having side surfaces inclined or curved outward; a sound reflection plate centered in a substanially vertical direction facing the speaker, having surfaces facing the side surfaces of the speaker housing curved to a conical flared shape, and diffusing sound output from the upper sound output opening in all orientations orientations in the horizontal direction by cooperating with the side surfaces of the speaker housing; at least one pair of microphones having directivity located in an opening end of the sound reflection plate and arranged around the center axis of the speaker radially in the horizontal direction and on straight lines straddling the center axis; a first signal processing means for processing received sound signals of the microphones; wherein the first signal processing means weights output levels of a plurality of bandpass filters, a second signal processing means for processing the processong results of the first signal processing means so as to cancel echo of the audio signal components output from the speaker, the at least one pair of microphones being located at equal distances from said speaker.