Method for noise cancellation in a room and sound system
A sound system and a method for noise cancellation in a room is provided, the method comprising arranging a set of microphones at a distance from an opening in a wall of the room for provision of one or more microphone input signals including a first microphone input signal; arranging a set of speakers in a vicinity of the opening; determining, based on at least the first microphone input signal, one or more output signals for the set of speakers for matching of sound entering the room through the opening; generating the one or more output signals; and outputting sound signals based on the one or more output signals with the set of speakers.
1 . A method for noise cancellation in a room, the method comprising:
arranging a set of microphones at a distance from an opening in a wall of the room for provision of one or more microphone input signals including a first microphone input signal;
arranging a set of speakers with respect to the opening, wherein at least some of the speakers are arranged across the opening to form an uneven coverage of an area of the opening;
determining, based on at least the first microphone input signal, one or more output signals for the set of speakers for matching of sound entering the room through the opening; and
outputting sound signals by the set of speakers based on the one or more output signals.
2 . The method according to claim 1 , further comprising generating one or more drive signals for the set of speakers, wherein the one or more drive signals are based on the one or more output signals.
3 . The method according to claim 2 , further comprising amplifying the drive signals.
4 . The method according to claim 1 , wherein the one or more output signals are one or more drive signals.
5 . The method according to claim 1 , wherein the set of microphones comprises at least ten microphones.
6 . The method according to claim 1 , wherein the set of speakers comprises at least ten speakers.
7 . The method according to claim 1 , wherein the set of microphones includes a first set of microphones arranged at a distance larger than 0.5 m from the opening.
8 . The method according to claim 7 , wherein the set of microphones includes a second set of microphones arranged at an edge of the opening.
9 . The method according to claim 1 , wherein at least some of the microphones in the set of microphones surrounds the opening.
10 . The method according to claim 1 , wherein the at least some of the speakers is a first subset of speakers in the set of speakers, wherein the act of arranging the set of speakers with respect to the opening also comprises arranging a second subset of speakers in the set of speakers along a circumference of the opening.
11 . The method according to claim 1 , wherein the act of arranging the set of speakers with respect to the opening comprises arranging the at least some of the speakers in a sparse array across the opening.
12 . The method according to claim 1 , further comprising arranging a first reference microphone in the room for provision of a first reference signal, wherein the act of determining the one or more output signals for the set of speakers for matching of sound entering the room through the opening is performed based on the first reference signal.
13 . The method according to claim 1 , wherein the at least some of the speakers are arranged across the opening to define at least two cells in the opening, each of the cells having an area that is larger than a cross-sectional area of each of the speakers.
14 . The method according to claim 1 , wherein the at least some of the speakers are arranged across the opening to at least partly define a cell in the opening, wherein the cell has a first dimension along a first direction, and a second dimension along a second direction perpendicular to the first direction, wherein the first dimension of the cell is larger than a first spacing between a first pair of speakers in the at least some of the speakers arranged along the first direction, and wherein the second dimension of the cell is larger than a second spacing between a second pair of speakers in the at least some of the speakers arranged along the second direction.
15 . A sound system for noise cancellation in a room, the sound system comprising:
a set of microphones for provision of one or more microphone input signals including a first microphone input signal;
a set of speakers; and
a processing device connected to the set of microphones and to the set of speakers, the processing device comprising a signal processor;
wherein the signal processor is configured to determine one or more output signals for the set of speakers for matching of sound entering the room through an opening in a wall of the room, wherein the one or more output signals are based on at least the first microphone input signal, and wherein at least some of the speakers are arranged across the opening to form an uneven coverage of an area of the opening; and
wherein the set of speakers is configured to output sound signals based on the one or more output signals.
16 . The sound system according to claim 15 , wherein the set of speakers comprises a sparse array of speakers, the sparse array of speakers comprising N rows and M columns, and wherein the number N of rows in the sparse array is at least three and the number M of columns in the sparse array is at least three.
17 . The sound system according to claim 15 , wherein the set of speakers comprises a sparse array of speakers, wherein the sparse array of speakers comprises at least a first center column of speakers to be arranged in the opening, and wherein the number of speakers in the first center column is at least five.
18 . The sound system according to claim 15 , wherein the set of speakers comprises a sparse array of speakers, wherein the sparse array of speakers comprises at least a first center row of speakers to be arranged in the opening, and wherein the number of speakers in the first center row is at least five.
19 . The sound system according to claim 15 , wherein the set of speakers comprises a sparse array of speakers, and wherein the sparse array of speakers forms at least 3 cells.
20 . The sound system according to claim 15 , wherein the at least some of the speakers are arranged across the opening to define at least two cells in the opening, each of the cells having an area that is larger than a cross-sectional area of each of the speakers.
21 . The sound system according to claim 15 , wherein the at least some of the speakers are arranged across the opening to at least partly define a cell in the opening, wherein the cell has a first dimension along a first direction, and a second dimension along a second direction perpendicular to the first direction, wherein the first dimension of the cell is larger than a first spacing between a first pair of adjacent speakers in the at least some of the speakers arranged along the first direction, and wherein the second dimension of the cell is larger than a second spacing between a second pair of adjacent speakers in the at least some of the speakers arranged along the second direction.