Method of determining acoustical characteristics of a room or venue having n sound sources

摘要

A method of determining acoustical characteristics of a room or venue using a microphone unit having four omni-directional microphones placed at ends of a tetrahedro-mounting unit which are equidistant to a middle point of a mounting unit. The four microphones detect impulse responses for each of n sound sources. The detected impulse responses are analyzed: (1) by determining a direct-sound-component direction, delay, and frequency response; (2) by determining an early-reflection direction, delay, and frequency response of each m early reflection; and (3) in view of late-reverberation components by determining a delay and frequency responses. Direct-sound-transmission-function filter parameters are calculated based on the determined direct-sound-component direction, delay, and frequency response M early-reflection-transmission-function filters parameters are calculated based on the m determined directions, delays, and frequency responses of the m early-reflection components. Late-reverberation-transmission-function filter parameters are calculated based on the delay and frequency response of the late-reverberation components.

主权项

1. A method of generating binaural audio signals to be reproduced via a headphone or earphone, comprising the steps of:
automatically determining acoustical characteristics of a room or venue having at least two sound sources, wherein, for each of the at least two sound sources direct sound filter parameters, early reflection filter parameters, a direction of a direct sound, and a direction of early reflections are obtained; and for each of the at least two sound sources:
filtering direct sound components with a filter having the direct sound filter parameters;automatically selecting, from a set of head-related transfer functions, one head-related transfer function which corresponds to the direction of the direct sound;processing the filtered direct sound component in the selected head-related transfer function which corresponds to the direction of the direct sound;filtering one or more early reflection components with one or more filters having the early reflection filter parameters, wherein one filter per early reflection component is used;automatically selecting, from a set of head-related transfer functions, one head-related transfer function which corresponds to the direction of the early reflection for each of the one or more early reflection components;processing each of the one or more filtered early reflection components in the respective selected head-related transfer function which corresponds to the direction of the respective early reflection; andsumming up, in a channel summing unit, the processed filtered direct sound component and the one or more processed filtered early reflection components, wherein a binaural output signal per sound source is obtained; wherein the method further comprises a step of: summing up, in a final summing unit, the binaural output signals of each of the two or more sound sources, wherein the binaural signal is obtained.