MICROPHONE ARRAY AND AUDIO SOURCE TRACKING SYSTEM
A microphone array of three or more microphones may be mounted on a housing or substrate configured to be mounted on or worn by a person. The microphone array may be positioned so that the far field sensing range of the microphone array is unobstructed by the housing or wearer. An accelerometer may be provided and mounted in a location which is fixed with respect to the microphones of the microphone array. The microphone array may be utilized with a beam-forming system in order to determine location of an audio source and a beam-steering system in order to isolate audio emanating from the direction of the audio source. The beam-forming system may be suitable for tracking the movement of one or more audio sources in order to inform the beam-steering system of the direction or location to be isolated. Because the microphone array will move with a user, an accelerometer may be provided to reduce the computational resources required for tracking and isolation by allowing compensation for change in position and orientation of the user/microphone array.
1 . A microphone array comprising:
a base configured to be worn by a user; and
three or more microphones mounted on said base; wherein said microphones are mounted in a configuration with a first microphone mounted in a position that is not co-linear with a second microphone and a third microphone.
2 . A microphone array according to claim 1 wherein said microphones are mounted on said base in a configuration where, for every angle of azimuth referenced from said microphone array from 0 degrees to 360 degrees, there are at least two microphones in said array which include the angle of azimuth within their field of sensitivity and are unobstructed by said base and user.
3 . A microphone array according to claim 2 wherein said base is a pair of headphones.
4 . A microphone array according to claim 3 wherein said microphones are mounted on a headband of said headphones.
5 . A microphone array according to claim 3 wherein said microphones are mounted on a substrate and said substrate is attached to said headphones.
6 . A microphone array according to claim 5 wherein said substrate is attached to a headband of said headphones.
7 . A microphone array according to claim 1 wherein said microphone array has 8 microphones.
8 . A microphone array according to claim 7 wherein said microphones are mounted in a generally coplanar configuration.
9 . A microphone array according to claim 2 wherein said substrate is a wearable collar.
10 . A microphone array according to claim 2 wherein said microphones are mounted on a hat.
11 . A microphone array according to claim 10 wherein said microphones are circumferentially distributed on a lateral portion of said hat.
12 . A microphone array according to claim 1 wherein said microphones are omni-directional microphones.
13 . A microphone array according to claim 1 wherein said microphones are optical microphones.
14 . A microphone array according to claim 1 wherein said microphones are silicone-based microphones.
15 . A microphone array according to claim 1 further comprising an accelerometer mechanically-linked to said microphone array.
16 . An audio source location tracking and isolation system comprising:
a microphone array having three or more microphones;
an accelerometer mounted in a fixed relationship to said microphone array;
a location processor responsive to said accelerometer;
a beam-forming unit responsive to said microphone array and a location compensation signal generated by said location processor; and
a beam steering unit responsive to said microphone array and said location compensation signal generated by said location processor.
17 . An audio source location tracking and isolation system according to claim 16 wherein said microphone array is mounted on a base configured to be worn on a user.