DIRECTIONAL MICROPHONE DEVICE, AUDIO SIGNAL PROCESSING METHOD AND PROGRAM

A directional microphone includes: a microphone (11) which generates a first acoustic signal that has sensitivity in a target direction; a microphone (12) which generates a second acoustic signal that has a blind spot in sensitivity in the target direction; a correction unit (105) which multiplies,...

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Bibliographische Detailangaben
Hauptverfasser:	KANAMORI, Takeo, TERADA, Yasuhiro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACOUSTICS DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MUSICAL INSTRUMENTS PHYSICS PUBLIC ADDRESS SYSTEMS SPEECH ANALYSIS OR SYNTHESIS SPEECH OR AUDIO CODING OR DECODING SPEECH OR VOICE PROCESSING SPEECH RECOGNITION
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Beschreibung
Zusammenfassung:	A directional microphone includes: a microphone (11) which generates a first acoustic signal that has sensitivity in a target direction; a microphone (12) which generates a second acoustic signal that has a blind spot in sensitivity in the target direction; a correction unit (105) which multiplies, in a frequency domain, the second acoustic signal by the first acoustic signal N times, where N is greater than zero, to generate a third acoustic signal which includes the second acoustic signal that has a narrowed angular range of the blind spot in sensitivity in the target direction; and a suppression unit (107) which performs noise suppression using the first acoustic signal as a main signal and the third acoustic signal generated as a reference signal, to generate an output acoustic signal which is the first acoustic signal that has narrowed directivity in the target direction.