Abstract: 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.

Abstract: 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 the 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.

Abstract: A microphone unit is provided which includes a microphone for picking up sound of a unit which sound is to be picked up, a clamping unit having a first end configured to clamp to the unit and a second end for holding the microphone, a contactless vibration sensor configured to detect vibrations of the unit, and an audio gate unit coupled to the output of the microphone and to the output of the contactless vibration sensor as a trigger signal to allow the output of the microphone to be forwarded to an output terminal.

Abstract: A microphone unit is provided which includes a microphone for picking up sound of a unit which sound is to be picked up, a clamping unit having a first end configured to clamp to the unit and a second end for holding the microphone, a contactless vibration sensor configured to detect vibrations of the unit, and an audio gate unit coupled to the output of the microphone and to the output of the contactless vibration sensor as a trigger signal to allow the output of the microphone to be forwarded to an output terminal.