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Claims  |
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We claim:
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.
2. The invention according to claim 1 comprising a second speaker
introducing sound into said second zone, and wherein the output cf said
first mentioned error microphone is supplied to said second speaker such
that said second person at said second speaker can hear the speech of said
first person, which speech is free of noise from said noise source.
3. The invention according to claim 2 comprising a second adaptive filter
model adaptively cancelling speech from said second person in the output
of said first error microphone, said second 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 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.
4. The invention according to claim 3 wherein said output correction signal
of said second adaptive filter model is subtractively summed with the
output of said first error microphone.
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.
6. The invention according to claim 5 comprising:
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 error microphone being supplied to said
speaker such that said first mentioned person can hear the speech of said
second person.
7. The invention according to claim 6 comprising a second speaker
introducing sound into said second zone, said sum also being supplied to
said second speaker such that said second person at said second zone can
hear the speech of said first person.
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.
9. The invention according to claim 8 comprising 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 third
sum, and an error input from said third sum, said third 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.
10. The invention according to claim 9 wherein said third sum is summed
with the output correction signal of said first adaptive filter model to
provide a fourth sum, said fourth sum being supplied to said first
speaker.
11. The invention according to claim 10 wherein:
said third sum is additively summed with said output correction signal of
said first adaptive filter model to provide said fourth sum;
said output correction signal of said second adaptive filter model is
subtractively summed with said output of said first error microphone to
provide said first sum;
said output correction signal of said third adaptive filter model is
subtractively summed with said first sum to provide said second sum;
said output correction signal of said fourth adaptive filter model is
subtractively summed with said output of said second error microphone to
provide said third sum.
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.
14. The invention according to claim 13 wherein said first sum is summed
with the correction signal output of said first adaptive filter model to
provide a second sum which is supplied to said first speaker, said second
sum being substantially free of noise from said second noise source as
cancelled by said second adaptive filter model, such that said second sum
to said first speaker is substantially free of noise from said second
noise source but does contain speech from said second person, such that
said first speaker cancels noise from said first noise source at said
first speaking location and introduces substantially no noise from said
second noise source and does introduce speech from said second person such
that said first person can hear said second person substantially free of
noise from said first and second noise sources.
15. The invention according to claim 14 comprising 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 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 with the speech of the second person removed.
16. The invention according to claim 14 comprising 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 said first sum to provide a third sum, and an error input from
said third sum, said third sum also being summed with said output
correction signal of said first adaptive filter model to provide said
second sum 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.
17. The invention according to claim 14 comprising:
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 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 with the speech of
the second person removed;
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 said first sum to provide a fourth
sum, and an error input from said fourth sum, said fourth sum also being
summed with said output correction signal of said first adaptive filter
model to provide said second sum input 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.
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.
19. The invention according to claim 18 comprising a third adaptive filter
model adaptively cancelling speech from said first person in the output of
said speech microphone, said third 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 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.
20. The invention according to claim 19 wherein said second sum is summed
with the output correction signal of said first adaptive filter model to
provide a third sum which is supplied to said first speaker.
21. The invention according to claim 20 wherein:
the model input of said second adaptive filter model is provided by said
second sum;
the model input of said third adaptive filter model is provide by said
first sum.
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.
23. The invention according to claim 22 wherein said sum is summed with the
output correction signal of said first adaptive filter model to provide a
second sum which is supplied to said first speaker.
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.
25. The invention according to claim 24 wherein:
the output of said first error microphone is summed with the correction
signal output of said second adaptive filter model to provide a first sum
which is supplied to said second speaker, said output of said first error
microphone being substantially free of noise from said first noise source
as cancelled by said first adaptive filter model, such that said first sum
supplied to said second speaker is substantially free of noise from said
first noise source but does contain speech from said first person, such
that said second speaker cancels noise from said second noise source at
said second speaking location and introduces substantially no noise from
said first noise source and does introduce speech from said first person
such that said second person can hear said first person substantially free
of noise from said first and second noise sources;
the output of said second error microphone is summed with the correction
signal output of said first adaptive filter model to provide a second sum
which is supplied to said first speaker, said output of said second error
microphone being substantially free of noise from said second noise source
as cancelled by said second adaptive filter model, such that said second
sum supplied to said first speaker is substantially free of noise from
said second noise source but does contain speech from said second person,
such that said first speaker cancels noise from said first noise source at
said first speaking location and introduces substantially no noise from
said second noise source and does introduce speech from said second person
such that said first person can hear said second person substantially free
of noise from said first and second noise sources.
26. The invention according to claim 24 comprising 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 sum, and an error input from said last mentioned sum.
27. The invention according to claim 24 comprising a third adaptive filter
model adaptively cancelling noise from said second noise source in the
output of said second error microphone, said third 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 sum, and an error input from said last mentioned sum.
28. The invention according to claim 24 comprising 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 sum,
and an error input from said last mentioned sum.
29. The invention according to claim 24 comprising 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 sum,
and an error input from said last mentioned sum.
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 | | |
