Ambisonics capture of sound field for loudspeaker calibration and room personalization

Abstract

Audio stimuli are generated and wirelessly sent to inputs of several speaker drivers simultaneously in a room, thereby producing a sound field around a portable audio capture device in the room. A first order ambisonics, FOA capture, of the sound field is generated using multiple microphone outputs of an integrated microphone array in the portable audio capture device. The FOA capture is processed to determine a set of filters for each of the speaker drivers. Each set may have a gain correction filter, a delay filter, and a timbral correction filter. The filters correct for sound coloration, such as that caused by one or more of i) a performance of the speaker driver, ii) acoustic characteristics of the room, and iii) a position of the speaker driver in the room that does not comply with a predetermined stereo or surround sound speaker layout. Other aspects are also described and claimed.