Automatic microphone muting of undesired noises by microphone arrays
View Patent ↗Methods and systems for cancellation of table noise in a speaker system used for video or audio conferencing are disclosed. Table noise is cancelled by using a vertical microphone array to distinguish the tilt angle of sound received by a microphone. If the sound is close to horizontal, the audio is muted. If the sound is above a given angle from horizontal, it is not muted, as this indicates a person speaking. This eliminates paper rustling, keyboard clicks and the like.
1. A microphone system comprising:
a vertical microphone array having at least two microphones, with a first microphone near a horizontal surface and a second microphone located above said first microphone; and
a processor coupled to said microphone array to receive sound from said first and second microphones and configured to determine an angle from horizontal of a received sound and mute said sound if said angle from horizontal is below a predetermined amount.
2. The microphone system of claim 1 , further comprising at least one loudspeaker.
3. The microphone system of claim 2 , wherein at least one of the microphones is a vertical distance away from the loudspeaker.
4. The microphone system of claim 1 , further comprising an echo cancellation module for each microphone in said vertical microphone array.
5. The microphone system of claim 4 , wherein said echo cancellation modules provide echo cancellation of sounds from a loudspeaker signal.
6. A noise cancellation method comprising: providing a vertical microphone array having at least two microphones, with a first microphone near a horizontal surface and a second microphone located above said first microphone; and receiving sounds from said first and second microphones; and determining an angle from horizontal of a received sound and muting by a processor said sound if said angle from horizontal is below a predetermined amount.
7. The noise cancellation method of claim 6 , further providing at least one loudspeaker.
8. The noise cancellation method of claim 7 , wherein at least one of the microphones is a vertical distance away from the loudspeaker.
9. The noise cancellation method of claim 6 , further providing an echo cancellation module for each microphone in said vertical microphone array.
10. The noise cancellation method of claim 9 , further comprising providing echo cancellation of sounds from a loudspeaker signal by the echo cancellation modules.