Communication system with active noise cancellation
First Claim
Patent Images
1. An active acoustic attenuation system comprising:
- a zone subject to noise from a noise source;
a microphone sensing noise from said noise source;
a speaking location in said zone such that a person at said speaking location is subject to noise from said noise source;
a speaker introducing sound into said zone at said speaking location;
an error microphone sensing noise and speech at said speaking location;
an adaptive filter model adaptively modeling an acoustic path from said noise microphone to said speaking location, said adaptive filter model having a model input from said noise microphone, an error input from said error microphone, and outputting a correction signal to said speaker to introduce cancelling sound at said speaking location to cancel noise from said noise source at said speaking location, such that the output of said error microphone carries a speech signal from said person but not a noise signal from said noise source;
a second zone spaced from said first mentioned zone;
a second error microphone sensing speech by a second person at said second zone, the output of said second microphone being supplied to said speaker such that said first mentioned person can hear the speech of said second person.
1 Assignment
0 Petitions
Accused Products
Abstract
An active acoustic attenuation system (10) is provided with various adaptive filter models (40, 48, 56, 70, 84, 100) enabling communication between persons (26, 30) in spaced zones (12, 16) by selectively cancelling undesired noise and undesired speech, all on an on-line basis without dedicated off-line pretraining and also for both broadband and narrowband noise.
125 Citations
39 Claims
-
1. An active acoustic attenuation system comprising:
-
a zone subject to noise from a noise source; a microphone sensing noise from said noise source; a speaking location in said zone such that a person at said speaking location is subject to noise from said noise source; a speaker introducing sound into said zone at said speaking location; an error microphone sensing noise and speech at said speaking location; an adaptive filter model adaptively modeling an acoustic path from said noise microphone to said speaking location, said adaptive filter model having a model input from said noise microphone, an error input from said error microphone, and outputting a correction signal to said speaker to introduce cancelling sound at said speaking location to cancel noise from said noise source at said speaking location, such that the output of said error microphone carries a speech signal from said person but not a noise signal from said noise source; a second zone spaced from said first mentioned zone; a second error microphone sensing speech by a second person at said second zone, the output of said second microphone being supplied to said speaker such that said first mentioned person can hear the speech of said second person. - View Dependent Claims (2, 3, 4)
-
-
5. An active acoustic attenuation system comprising:
-
a zone subject to noise from a noise source; a microphone sensing noise from said noise source; a speaking location in said zone such that a person at said speaking location is subject to noise from said noise source; a speaker introducing sound into said zone at said speaking location; an error microphone sensing noise and speech at said speaking location; a first adaptive filter model adaptively modeling an acoustic path from said noise microphone to said speaking location, said first adaptive filter model having a model input from said noise microphone, an error input from said error microphone, and outputting a correction signal to said speaker to introduce cancelling sound at said speaking location to cancel noise from said noise source at said speaking location; a second adaptive filter model adaptively cancelling noise from said noise source in the output of said error microphone, said second adaptive filter model having a model input from said noise microphone, an output correction signal summed with the output of said error microphone to provide a sum, and an error input from said sum. - View Dependent Claims (6, 7)
-
-
8. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a noise source; a second zone spaced from said first zone; a microphone sensing noise from said noise source; a speaking location in said first zone such that a first person at said speaking location is subject to noise from said noise source; a first speaker introducing sound into said first zone at said speaking location; a second speaker introducing sound into said second zone; a first error microphone sensing noise and speech at said speaking location; a second error microphone sensing speech of a second person at said second zone, the output of said second error microphone being supplied to said first speaker such that said first person can hear the speech of said second person; a first adaptive filter model adaptively modeling an acoustic path from said noise microphone to said speaking location, said first adaptive filter model having a model input from said noise microphone, an error input from said first error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said speaking location to cancel noise from said noise source at said speaking location; a second adaptive filter model adaptively cancelling noise from said noise source in the output of said first error microphone, said second adaptive filter model having a model input from said noise microphone, an output correction signal summed with the output of said first error microphone to provide a first sum, and an error input from said first sum; a third adaptive filter model adaptively cancelling speech from said second person in the output of said first error microphone, said third adaptive filter model having a model input from said second error microphone, an output correction signal summed with said first sum to provide a second sum, and an error input from said second sum, said second sum also being supplied to said second speaker such that said second person can hear the speech of said first person with the speech of said second person removed. - View Dependent Claims (9, 10, 11)
-
-
12. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a noise source; a second zone spaced from said first zone; a microphone sensing noise from said noise source; a speaking location in said first zone such that a first person at said speaking location is subject to noise from said noise source; a first speaker introducing sound into said first zone at said speaking location; a second speaker introducing sound into said second zone; a first error microphone sensing noise and speech at said speaking location; a second error microphone sensing speech of a second person at said second zone, the output of said second error microphone being supplied to said first speaker such that said first person can hear the speech of said second person; a first adaptive filter model adaptively modeling an acoustic path from said noise microphone to said speaking location, said first adaptive filter model having a model input from said noise microphone, an error input from said first error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said speaking location to cancel noise from said noise source at said speaking location; a second adaptive filter model adaptively cancelling noise from said noise source in the output of said first error microphone, said second adaptive filter model having a model input from said noise microphone, an output correction signal summed with the output of said first error microphone to provide a first sum, and an error input from said first sum, said first sum also being supplied to said second speaker such that said second person can hear the speech of said first person; a third adaptive filter model adaptively cancelling speech from said first person in the output of said second error microphone, said third adaptive filter model having a model input from said first error microphone, an output correction signal summed with the output of said second error microphone to provide a second sum, and an error input from said second sum, said second sum also being supplied to said first speaker such that said first person can hear the speech of said second person with the speech of said first person removed.
-
-
13. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a first noise source; a second zone spaced from said first zone and subject to noise from a second noise source; a first noise microphone sensing noise from said first noise source; a second noise microphone sensing noise from said second noise source; a first speaking location in said first zone such that a first person at said first speaking location is subject to said noise from said first noise source; a second speaking location in said second zone such that a second person at said second speaking location is subject to said noise from said second noise source; a first speaker introducing sound into said first zone at said first speaking location; a second speaker introducing sound into said second zone at said second speaking location; a first error microphone sensing noise and speech at said first speaking location; a second error microphone sensing noise and speech at said second speaking location; a first adaptive filter model adaptively modeling a first acoustic path from said first noise microphone to said first speaking location, said first adaptive filter model having a model input from said first noise microphone, an error input from said first error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said first speaking location to cancel noise from said first noise source at said first speaking location; a second adaptive filter model adaptively cancelling noise from said second noise source in the output of said second error microphone, said second adaptive filter model having a model input from said second noise microphone, an output correction signal summed with the output of said second error microphone to provide a first sum, and an error input from said first sum; said first sum also being supplied to said first speaker such that said first person can hear the speech of said second person. - View Dependent Claims (14, 15, 16, 17)
-
-
18. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a first noise source; a second zone spaced from said first zone; a noise microphone sensing noise from said first noise source; a first speaking location in said first zone such that a first person at said first speaking location is subject to said noise from said first noise source; a second speaking location in said second zone; a first speaker introducing sound into said first zone at said first speaking location; a second speaker introducing sound into said second zone at said second speaking location; an error microphone sensing noise and speech at said first speaking location; a speech microphone sensing speech by a second person at said second speaking location; a first adaptive filter model adaptively modeling an acoustic path from said noise microphone to said first speaking location, said first adaptive filter model having a model input from said noise microphone, an error input from said error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said first speaking location to cancel noise from said noise source at said first speaking location; the output of said first error microphone also being supplied to said second speaker such that said second person can hear the speech of said first person; the output of said speech microphone being supplied to said first speaker such that said first person can hear the speech of said second person; a second adaptive filter model adaptively cancelling speech from said second person in the output of said error microphone, said second adaptive filter model having a model input from said speech microphone, an output correction signal summed with the output of said error microphone to provide a sum, and an error input from said sum, said sum also being supplied to said second speaker such that said second person can hear the speech of said first person with the speech of said second person removed. - View Dependent Claims (19, 20, 21)
-
-
22. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a first noise source; a second zone spaced from said first zone; a noise microphone sensing noise from said first noise source; a first speaking location in said first zone such that a first person at said first speaking location is subject to said noise from said first noise source; a second speaking location in said second zone; a first speaker introducing sound into said first zone at said first speaking location; a second speaker introducing sound into said second zone at said second speaking location; an error microphone sensing noise and speech at said first speaking location; a speech microphone sensing speech by a second person at said second speaking location; a first adaptive filter model adaptively modeling an acoustic path from said noise microphone to said first speaking location, said first adaptive filter model having a model input from said noise microphone, an error input from said error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said first speaking location to cancel noise from said noise source at said first speaking location; the output of said error microphone also being supplied to said second speaker such that said second person can hear the speech of said first person; the output of said speech microphone being supplied to said first speaker such that said first person can hear the speech of said second person; a second adaptive filter model adaptively cancelling speech from said first person in the output of said speech microphone, said second adaptive filter model having a model input from said error microphone, an output correction signal summed with the output of said speech microphone to provide a sum, and an error input from said sum, said sum also being supplied to said first speaker such that said first person can hear the speech of said second person with the speech of said first person removed. - View Dependent Claims (23)
-
-
24. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a first noise source; a second zone spaced from said first zone and subject to noise from a second noise source; a first noise microphone sensing noise from said first noise source; a second noise microphone sensing noise from said second noise source; a first speaking location in said first zone such that a first person at said first speaking location is subject to said noise from said first noise source; a second speaking location in said second zone such that a second person at said second speaking location is subject to said noise from said second noise source; a first speaker introducing sound into said first zone at said first speaking location; a second speaker introducing sound into said second zone at said second speaking location; a first error microphone sensing noise and speech at said first speaking location; a second error microphone sensing noise and speech at said second speaking location; a first adaptive filter model adaptively modeling a first acoustic path from said first noise microphone to said first speaking location, said first adaptive filter model having a model input from said first noise microphone, an error input from said first error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said first speaking location to cancel noise from said first noise source at said first speaking location; a second adaptive filter model adaptively modeling a second acoustic path from said second noise microphone to said second speaking location, said second adaptive filter model having a model input from said second noise microphone, an error input from said second error microphone, and outputting a correction signal to said second speaker to introduce cancelling sound at said second speaking location to cancel noise from said second noise source at said second speaking location; the output of said first error microphone also being supplied to said second speaker such that said second person can hear the speech of said first person; the output of said second error microphone also being supplied to said first speaker such that said first person can hear the speech of said second person. - View Dependent Claims (25, 26, 27, 28, 29)
-
-
30. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a first noise source; a second zone spaced from said first zone and subject to noise from a second noise source; a first noise microphone sensing noise from said first noise source; a second noise microphone sensing noise from said second noise source; a first speaking location in said first zone such that a first person at said first speaking location is subject to said noise from said first noise source; a second speaking location in said second zone such that a second person at said second speaking location is subject to said noise from said second noise source; a first speaker introducing sound into said first zone at said first speaking location; a second speaker introducing sound into said second zone at said second speaking location; a first error microphone sensing noise and speech at said first speaking location; a second error microphone sensing noise and speech at said second speaking location; a first adaptive filter model adaptively modeling a first acoustic path from said first noise microphone to said first speaking location, said first adaptive filter model having a model input from said first noise microphone, an error input from said first error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said first speaking location to cancel noise from said first noise source at said first speaking location; a second adaptive filter model adaptively modeling a second acoustic path from said second noise microphone to said second speaking location, said second adaptive filter model having a model input from said second noise microphone, an error input from said second error microphone, and outputting a correction signal to said second speaker to introduce cancelling sound at said second speaking location to cancel noise from said second noise source at said second speaking location; a third adaptive filter model adaptively cancelling noise from said first noise source in the output of said first error microphone, said third adaptive filter model having a model input from said first noise microphone, an output correction signal summed with the output of said first error microphone to provide a first sum, and an error input from said first sum; said first sum also being supplied to said second speaker such that said second person can hear the speech of said first person; a fourth adaptive filter model adaptively cancelling noise from said second noise source in the output of said second error microphone, said fourth adaptive filter model having a model input from said second noise microphone, an output correction signal summed with the output of said second error microphone to provide a second sum, and an error input from said second sum; said second sum also being supplied to said first speaker such that said first person can hear the speech of said second person. - View Dependent Claims (31, 32)
-
-
33. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a first noise source; a second zone spaced from said first zone and subject to noise from a second noise source; a first noise microphone sensing noise from said first noise source; a second noise microphone sensing noise from said second noise source; a first speaking location in said first zone such that a first person at said first speaking location is subject to said noise from said first noise source; a second speaking location in said second zone such that a second person at said second speaking location is subject to said noise from said second noise source; a first speaker introducing sound into said first zone at said first speaking location; a second speaker introducing sound into said second zone at said second speaking location; a first error microphone sensing noise and speech at said first speaking location; a second error microphone sensing noise and speech at said second speaking location; a first adaptive filter model adaptively modeling a first acoustic path from said first noise microphone to said first speaking location, said first adaptive filter model having a model input from said first noise microphone, an error input from said first error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said first speaking location to cancel noise from said first noise source at said first speaking location; a second adaptive filter model adaptively modeling a second acoustic path from said second noise microphone to said second speaking location, said second adaptive filter model having a model input from said second noise microphone, an error input from said second error microphone, and outputting a correction signal to said second speaker to introduce cancelling sound at said second speaking location to cancel noise from said second noise source at said second speaking location; a third adaptive filter model adaptively cancelling noise from said first noise source in the output of said first error microphone, said third adaptive filter model having a model input from said first noise microphone, an output correction signal summed with the output of said first error microphone to provide a first sum, and an error input from said first sum; a fourth adaptive filter model adaptively cancelling noise from said second noise source in the output of said second error microphone, said fourth adaptive filter model having a model input from said second noise microphone, an output correction signal summed with the output of said second error microphone to provide a second sum, and an error input from said second sum; a fifth adaptive filter model adaptively cancelling speech from said second person in the output of said first error microphone, said fifth adaptive filter model having a model input from said second error microphone, an output correction signal summed with said first sum to provide a third sum, and an error input from said third sum; said third sum also being supplied to said second speaker such that said second person can hear the speech of said first person; a sixth adaptive filter model adaptively cancelling speech from said first person in the output of said second error microphone, said sixth adaptive filter model having a model input from said first error microphone, an output correction signal summed with said second sum to provide a fourth sum, and an error input from said fourth sum; said fourth sum also being supplied to said first speaker such that said first person can hear the speech of said second person.
-
-
38. An active acoustic attenuation system comprising:
-
a first zone subject to noise from a first noise source; a second zone spaced from said first zone and subject to noise from a second noise source; a first noise microphone sensing noise from said first noise source; a second noise microphone sensing noise from said second noise source; a first speaking location in said first zone such that a first person at said first speaking location is subject to said noise from said first noise source; a second speaking location in said second zone such that a second person at said second speaking location is subject to said noise from said second noise source; a first speaker introducing sound into said first zone at said first speaking location; a second speaker introducing sound into said second zone at said second speaking location; a first error microphone sensing noise and speech at said first speaking location; a second error microphone sensing noise and speech at said second speaking location; a first adaptive filter model adaptively modeling a first acoustic path from said first noise microphone to said first speaking location, said first adaptive filter model having a model input from said first noise microphone, an error input from said first error microphone, and outputting a correction signal to said first speaker to introduce cancelling sound at said first speaking location to cancel noise from said first noise source at said first speaking location; a second adaptive filter model adaptively modeling a second acoustic path from said second noise microphone to said second speaking location, said second adaptive filter model having a model input from said second noise microphone, an error input from said second error microphone, and outputting a correction signal to said second speaker to introduce cancelling sound at said second speaking location to cancel noise from said second noise source at said second speaking location; a third adaptive filter model adaptively cancelling speech from said second person in the output of said first error microphone, said third adaptive filter model having a model input from said second error microphone, an output correction signal summed with the output of said first error microphone to provide a first sum, and an error input from said first sum; a fourth adaptive filter model adaptively cancelling speech from said first person in the output of said second error microphone, said fourth adaptive filter model having a model input from said first error microphone, an output correction signal summed with the output of said second error microphone to provide a second sum, and an error input from said second sum; said first sum also being supplied to said second speaker such that said second person can hear the speech of said first person; said second sum also being supplied to said first speaker such that said first person can hear the speech of said second person. - View Dependent Claims (34, 35, 36, 37, 39)
-
Specification