JP2003255954A - Seat system and external noise canceling device usable for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat system which can remove external noise in a grouping area and enables a conversation to be shared. <P>SOLUTION: In a seat area of a movie house, a theater, etc., a plurality of seats 13 are arranged. Each seat 13 is equipped with a plurality of sound collection parts (microphone) which collects environmental sounds from a plurality of directions and a plurality of sound radiation parts (speaker) which radiate canceling sounds for canceling a noise sound according to the environmental sounds collected by the plurality of sound collection parts. A grouping area including one or more seats 13 can be set. A canceling sound is radiated from only a sound radiation part which radiates the canceling sound to the grouping area corresponding to the border of the set grouping area. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat system suitable for being applied to, for example, a theater or a movie theater, and an external noise canceling device which can be used therein.

More specifically, it is possible to set a grouping area composed of one or more sheets, and a canceling sound for canceling an external noise sound is emitted only from a sound emitting portion corresponding to the boundary of the grouping area. Thus, the present invention relates to a seat system in which noise sounds from outside the area can be eliminated and conversation can be shared in the grouping area.

Further, a plurality of sound collecting parts for collecting environmental sounds from a plurality of directions and a plurality of sound collecting parts are provided in pairs, respectively, and the environment collected by the plurality of sound collecting parts. By providing a plurality of sound emitting units that emit a canceling sound for canceling a noise sound based on the sound, and by obtaining a canceling signal by class classification adaptive processing from the noise signal extracted from the environmental sound signal The present invention relates to an external noise canceling device capable of canceling an external noise sound well.

[0004]

2. Description of the Related Art In theaters, movie theaters and the like, a seat area is provided facing a stage or a screen, and a plurality of seats (seats) are arranged in order in this seat area. Conventionally, a plurality of sound collecting units that collect environmental sounds (noise sounds) and a plurality of sound collecting units are provided in pairs, respectively, and noise is generated based on the environmental sounds collected by the plurality of sound collecting units. An external noise reduction device has been proposed, which is provided with a plurality of sound emission units for emitting a canceling sound for canceling a sound and reduces an external noise sound (see Japanese Patent Laid-Open No. 2000-242277).

[0005]

By applying the above-mentioned external noise reducing device to a seat (seat), it is possible to reduce the external noise sound to the spectator sitting on the seat. However, when a spectator who comes in a group sits on an adjacent seat, in the case of simply reducing the external noise sound on each seat, the conversation sound between the adjacent spectators in the same group is also reduced as noise sound. This makes it difficult to share the venue within the group.

Further, in the conventional external noise reduction device, the noise signal extracted based on the environmental sound collected by the sound collecting unit is inverted, and the inverted noise signal is used by the sound emitting unit. It is configured to emit a canceling sound. In other words, it is assumed that there is no time difference between the time when the environmental sound is collected by the sound collecting unit and the time when the canceling sound is emitted by the sound emitting unit by the inversion noise signal obtained based on the collected environmental sound. Handling.

However, in reality, there is a time lag caused by the signal processing system between these time points, so the canceling sound emitted from the sound emitting section cancels the noise sound contained in the environmental sound at that time point. It may not be possible.

Therefore, it is an object of the present invention to provide a seat system in a grouping area in which noise sounds from outside the area can be eliminated and conversation can be shared. Another object of the present invention is to provide an external noise canceling device capable of canceling an external noise sound well.

[0009]

SUMMARY OF THE INVENTION A seat system according to the present invention includes a plurality of sound collecting parts for collecting environmental sounds from a plurality of directions and respective environments collected by the plurality of sound collecting parts. A plurality of sheets, each of which is provided with a plurality of sound emitting portions for emitting a canceling sound for canceling a noise sound based on the sound, and a grouping composed of one or more sheets from the plurality of sheets. Corresponding to the boundary between the area setting means for setting the area and the grouping area set by this area setting means, the canceling sound is emitted only from the sound emitting part that emits the canceling sound toward the grouping area. And control means for controlling.

In the present invention, a plurality of seats (seats) are provided. Each sheet has a plurality of sound collecting parts and a plurality of sound emitting parts that emit a canceling sound for canceling a noise sound based on each environmental sound collected by the plurality of sound collecting parts. It is provided. Then, the area setting means sets a grouping area including one sheet or two or more sheets from the plurality of sheets.

For example, the sheet can be moved in the left-right direction, and the area setting means links the movement detector for detecting the movement of the sheet in the left-right direction with the front and rear sheets provided at a predetermined position of the sheet. And a link setter for setting a grouping area based on the detection output of the movement detector and the setting of the link setter.

Further, for example, the seat can be moved in the left-right direction and the front-rear direction, and the area setting means includes a first movement detector for detecting the movement of the seat in the left-right direction and the front-back direction of the seat. A second movement detector that detects movement in a direction, and sets a grouping area based on detection outputs of the first and second movement detectors. Further, for example, the area setting means has a setting device that is provided at a predetermined position on the sheet and that sets the arrival direction of the noise sound to be canceled, and sets the grouping region based on the setting of this setting device.

Then, the control means controls so as to emit the canceling sound only from the sound emitting portion corresponding to the boundary of the grouping area set by the area setting means. As a result, in the grouping area, noise noise from outside the area can be eliminated and conversation can be shared.

Further, the external noise canceling apparatus according to the present invention is provided with a plurality of sound collecting units for collecting environmental sounds from a plurality of directions and a pair of the plurality of sound collecting units. Based on the environmental sound collected by the sound collection unit of
It is provided with a plurality of sound emitting units that emit a canceling sound for canceling a noise sound. The sound collecting unit has acoustoelectric conversion means for converting the collected environmental sound into an electric signal, and the sound emitting part corresponds to noise sound from the output signal of the acoustoelectric conversion means of the corresponding sound collecting portion. Noise signal extracting means for extracting a noise signal to be extracted, and a plurality of first data located around the position of interest in the canceling signal corresponding to the canceling sound are selected based on the noise signal extracted by the noise signal extracting means. Based on the first data selecting means and the plurality of first data selected by the first data selecting means,
Class detection means for detecting the class to which the data of the position of interest belongs, coefficient data generation means for generating coefficient data of the estimation formula corresponding to the class detected by this class detection means, and noise signal extraction means Second data selecting means for selecting a plurality of second data located around the position of interest in the cancellation signal based on the noise signal;
The coefficient data generated by the coefficient data generating means and the second
Using the plurality of second data selected by the data selecting means, the calculating means for calculating the data of the position of interest in the canceling signal based on the estimation formula and the canceling signal composed of the data calculated by the calculating means are canceled. And an electroacoustic conversion means for converting into sound.

In the present invention, the cancellation signal is generated from the noise signal extracted from the environmental sound signal by the class classification adaptive processing. In this case, it is possible to generate the canceling signal so that the canceling sound emitted by the canceling signal corresponds to the noise sound included in the environmental sound at the time of the sounding. Therefore, the external noise sound can be canceled well.

Here, the sound emitting unit inputs a parameter value for inputting a value of a parameter that determines the amount of advance of the environmental sound including the noise sound to be canceled by the canceling sound with respect to the environmental sound collected by the sound collecting unit. Further comprising means, the coefficient data generating means, corresponding to the class detected by the class detection means and the value of the parameter input to the parameter input means, by being configured to generate coefficient data of the estimation formula, By adjusting the parameter value, it is possible to emit the canceling sound corresponding to the amount of advance, and the canceling sound is emitted based on the time when the environmental sound is collected by the sound collecting unit and the collected environmental sound. Even if there is a variation in the time difference between the sounding time and the sounding time, it can be dealt with.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of a movie theater 10 to which a seat system according to the present invention is applied. This cinema 10 has a screen 11 on the front.
Is arranged, and a seat area 12 is provided so as to face the screen 11, and a plurality of seats 13 (seats) are arranged in the seat area 12 in the front, rear, left and right order (a part of the seat 13 is shown in FIG. 1). Only shown). Speakers 14 for outputting movie sound are respectively arranged on the front surface, the left side surface, the right side surface, and the rear surface with respect to the seat area 12.

In the present embodiment, the seat area 12
Of a plurality of sheets 13 arranged in a group selectively consisting of one or more sheets (GP)
Area) can be set. Then, the canceling sound for canceling the external noise sound is emitted only from the sound emitting portion that corresponds to the boundary of the grouping area and emits the canceling sound toward the grouping area. Makes it possible to eliminate noise from outside the area and to share conversations.

FIG. 2 shows a schematic structure of the seat 13. In FIG. 2, the speaker and the microphone attached to the seat 13 are shown by solid lines even inside the seat 13. The seat 13 includes a base portion 13A, a backrest portion 13B upwardly connected to a rear end of the base portion 13A, an armrest portion 13C upwardly connected from both ends of the base portion 13A, a base portion 13A and a backrest portion 13B. 13D, which is connected to the lower surface of the armrest, and an arm portion 13E, which is rotatably attached to the upper end side surface of the backrest portion 13B. Arm part 13E
Can selectively take a state parallel to the backrest 13B (first state) or a state parallel to the armrest 13C (second state).

The seat 13 is arranged on a rail 15 for moving the seat 13 in the left-right direction. The seat 13 is configured so that it can be moved in three steps in the left-right direction: a right position, a center position, and a left position. In this case, even if the position of the seat 13 is set to the left side position or the right side position, the other adjacent seats 1
The left side position and the right side position are set so as not to be in close contact with 3. The rail 15 is provided with a movement detector 16 for detecting whether the position of the seat 13 in the left-right direction is the right position, the center position, or the left position described above.

Further, the backrest portion 13B of the seat 13 is provided with a speaker S _BC directed toward the rear straight direction at the center of the rear surface.
A speaker S _BR of the rear right toward the rear obliquely rightward, a speaker S _BL to the rear left toward the rear obliquely leftward, a speaker S _FC toward the front straight ahead to the front center, front diagonal left to right front A speaker S _FR directed in the direction and a speaker S _FL directed diagonally forward to the right are provided on the left side of the entire surface. These speakers S _BC , S _BR , S _BL , S _FC , S _FR and S _FL are
The electro-acoustic conversion means is configured to emit a canceling sound for canceling a noise sound.

In addition, on the backrest 13B of the seat 13
Is the speaker S_BC, S_BR, S_BL, S_FC, S_FR, S_FLToso
Microphone M for each pair_BC, M_BR, M_BL, M_FC，
M_FR, M_FLIs provided. These microphones
M_BC, M_BR, M_BL, M_FC, M_FR, M _FLAcoustoelectric conversion
It is for constituting a means and collecting environmental sounds.

The microphone M _BC is for collecting environmental sound traveling in the backward straight direction. Microphone M
_BR is for collecting environmental sound that is directed diagonally rearward and to the right. The microphone M _BL is for collecting environmental sound that is directed rearward and diagonally to the left. Microphone M _FC
Is for collecting the environmental sound traveling in the forward straight direction. The microphone M _FR is for collecting environmental sound directed diagonally to the front left. The microphone M _FL is for collecting environmental sound directed diagonally to the front right.

Further, the arm portion 13E on the right side of the seat 13
Is provided with a speaker S _R directed to the left on its free end side. Similarly, the left arm portion 13 of the seat 13
E has a speaker S _L directed to the right on its free end side. These speakers S _R and S _L constitute electroacoustic conversion means and emit a canceling sound for canceling noise sound.

Further, the arm portions 13E, 13 of the seat 13
E is provided with microphones M _R and M _L paired with speakers S _R and S _L , respectively. These microphones M
_R, M _L constitutes the acoustoelectric conversion means is for collecting environmental sound. The microphone M _R is for collecting the environmental sound directed to the left. The microphone M _L is for collecting environmental sound directed to the right.

The arm portion 13E is an armrest portion 1 when the speakers S _R and S _L and the microphones M _R and M _L are used.
It can be placed in a state parallel to 3C (second state), and can be placed in a state parallel to backrest 13B (first state) in other cases.

Further, on the back side of the backrest portion 13B of the seat 13, a front and rear link switch 17 as a link setting device is provided.
Is provided. With this front and rear link switch 17,
3) "Do not link to any of the preceding and following sheets", "Link to the previous sheet", "Link to the subsequent sheet"
Two link states can be set.

The front and rear link switch 17 and the movement detector 16 described above constitute a grouping area setting means. The setting information of the front-rear link switch 17 and the detection output of the movement detector 16 are supplied to a system controller 30 described later that controls the noise canceling operation of the plurality of seats 13 arranged in the seat area 12.

Here, a method of setting the grouping area will be described. When setting the grouping area including only one sheet 13, the position in the left-right direction of the sheet 13 is set to the center position, and the link setting with the sheets 13 before and after the sheet 13 is set to “any one of the front and rear sheets”. Do not link with ". In this case, the left and right arm portions 13E of the seat 13 are set in a state parallel to the armrest portions 13C (second state).

Further, when setting a grouping area including two left and right sheets 13h1 and 13h2, as shown in FIGS.
As shown in, the right side sheet 13h1 is moved to the left side by a predetermined distance d from the center position to make that position the left side position, and the left side sheet 13h2 is moved to the right side from the center position by a predetermined distance d to the position thereof. Is the right side position. In this case, the arm portion 13E on the right side of the seat 13h1 and the arm portion 3E on the left side of the seat 13h2 are respectively connected to the armrests 13
The state is parallel to C (second state). Also in this case,
The link setting with the sheet 13 before and after the sheets 13h1 and 13h2 is set to "not link with any sheet before and after".

Also, two left and right sheets x two front and rear sheets 13h1
When setting a grouping area including 1, 13h12, 13h21, 13h22, as shown in FIGS. 4A and 4B, the front and rear right sheets 13h11, 13h21 are moved to the left by a predetermined distance d from the center position and the positions thereof are set. Is set to the left side position, and the front and rear left seats 13h12 and 13h22 are moved to the right side by a predetermined distance d from the center position to set the position to the right side position.

In this case, the front seats 13h11, 13h12
Set the link setting with the front and rear seats 13 to "Link with the rear seat" and set the rear seat 13h2
Set the link setting with the sheets 13 before and after 1, 13h22 to "link with the previous sheet". Further, in this case, the right arm portion 13E of the seats 13h11 and 13h21 and the left arm portion 13E of the seats 13h12 and 13h22 are in a state (second state) parallel to the armrest portions 13C, respectively.

When setting a grouping area including three or more sheets 13 on the left and right sides, the rightmost sheet 13 is moved to the left side by a predetermined distance d from the center position, and the position is set to the left side position. The seat 13 is moved rightward from the center position by a predetermined distance d, and the position is set to the right position, and the seat 13 located between the left and right directions is left at the center position. In this case, the right arm portion 13E of the rightmost seat 13 and the left arm portion 13E of the leftmost seat 13 are respectively connected to the armrest portions 13C.
Parallel to (second state).

Further, in this case, the frontmost sheet 13
The link setting with the seats 13 before and after is set to "link with the subsequent seat" and the rearmost seat 13
The link setting with the front and rear seats 13 is set to "Link with the previous seat", and the link setting with the front and rear seats 13 of the seat 13 located in the front and rear direction is set to "For both front and rear seats". Set to "No link".

Next, the operation of canceling external noise will be described.
To do. FIG. 5 shows a grouping area including one sheet 13.
The external noise canceling operation in the range is shown. This place
Under the control of the system controller 30 described later,
It is provided on the front surface of the backrest portion 13B of the seat 13.
Speaker S_FR, S_FC, S _FLAnd the left and right arm parts 13
Speaker S provided in E_R, S_LAnd the sheet 13
Installed on the rear surface of the backrest portion 13B of the seat 13 located in the front.
Speaked speaker S_BCAnd in front of the right side of the seat 13
Provided on the rear surface of the backrest portion 13B of the seat 13
Speaker S_BLAnd a seat located to the left front of the seat 13.
Speakers provided on the rear surface of the backrest portion 13B of the toe 13
S_BRThe cancellation sound is emitted from and.

FIG. 6 shows two left and right sheets 13h1 and 13h2.
External noise canceling operation in the grouping area including
Shows. In this case, the system controller described later
Under the control of 30, the seat back 13B of the seat 13h1
Speaker S provided on the front _FR, S_FC, S_FL, To the right
Speaker S provided on the arm portion 13E of the_RAnd the sheet
Speaker provided on the front surface of the back portion 13B of 13h2
S_FR, S_FC, S_FL, Provided on the left arm portion 13E
Speaker S_LAnd the seat in front of seat 13h1
Speakers provided on the rear surface of the backrest portion 13B of the toe 13
S_BC, S_BLAnd seat 1 located to the right front of seat 13h1
The speaker S provided on the backrest portion 13B of No. 3_BLAnd
Seat 13 in front of the seat 13h2
Speaker S provided on the rear surface of B_BR, S_BCAnd sheet 1
On the backrest 13B of the seat 13 located on the left front of 3h2
Speaker S provided_BRThe cancellation sound is emitted from
It

FIG. 7 shows two seats 13 on the left and right and two on the front and rear.
The external noise canceling operation in the grouping area including h11, 13h12, 13h21, and 13h22 is shown. In this case, under the control of the system controller 30 described later,
Speakers S _FR , S _FC , S _FL provided on the front surface of the backrest portion 13B of the seat 13h21, and the arm portion 13E on the right side thereof.
A speaker S _R provided in a speaker S _FR provided on the front surface of the backrest portion 13B of the seat 13h22, S _FC,
S _FL , a speaker S _L provided on the left arm 13E, a speaker S _BL provided on a backrest 13B of the seat 13 located on the right front side of the seat 13h21, and a seat 1
Seat back 13B of the seat 13 located on the left front of 3h22
Speaker S _BR provided on the seat 13h11, the speaker S _FR provided on the front surface of the seat 13h11, and the arm portion 13E on the right side thereof.
The speaker S _R provided on the seat 13h12, the speaker S _FL provided on the front surface of the seat 13h12, the speaker S _L provided on the left arm 13E, and the backrest 13B of the seat 13 located in front of the seat 13h11. The speakers S _BC and S _BL provided on the rear surface of the vehicle and the speaker S provided on the backrest portion 13B of the seat 13 located to the front right of the seat 13h11.
_BL and speakers S _BR and S provided on the rear surface of the backrest portion 13B of the seat 13 located in front of the seat 13h12
_The canceling sound is emitted from _BC and the speaker S _BR provided on the backrest portion 13B of the seat 13 located on the left front side of the seat 13h12.

Although detailed description is omitted, the external noise canceling operation in the other grouping areas is also performed under the control of the system controller 30 described later. That is, the canceling sound is emitted only from the speaker that corresponds to the boundary of the grouping area and emits the canceling sound toward the inside of the grouping area. This allows
Within the grouping area, noise sounds from outside the area can be eliminated and conversation can be shared.

As described above, the detection output of the movement detector 16 of each seat 13 and the setting information of the front and rear link switch 17 are the same as those of the plurality of seats 13 arranged in the seat area 12.
Is supplied to a system controller 30 which will be described later that controls the noise canceling operation of the sheet, and the noise canceling operation of each sheet 13 is controlled by the control of the system controller 30.

Next, referring to FIG. 8, the seat area 12
The circuit configuration relating to the noise canceling operation in the plurality of sheets 13 arranged in the above will be described. A seat circuit section 20 is provided corresponding to each seat 13. The system controller 30 controls the operation of each seat circuit unit 20. The system controller 30 is arranged at a position separate from the seat area 12 in which a plurality of seats 13 are arranged, for example. In this system controller 30,
An operation unit 31 for the operator to perform various operations, a display unit 32 for displaying the setting state of the grouping area, and the like.
A storage device 33 including an HDD (Hard Disk Drive) or the like is connected.

The storage device 33 stores a voice signal used when a noise signal is extracted from an output signal of each microphone, as will be described later, that is, a voice signal in the absence of noise (hereinafter referred to as "reference voice signal"). ") Is recorded in advance by each microphone. This reference audio signal is composed of a signal component corresponding to purely movie sound, which does not include a signal component corresponding to the conversation voice of the audience. In the storage device 33, as many as the number of microphones,
This reference audio signal will be recorded in advance.

The structure of the seat circuit section 20 will be described. The seat circuit unit 20 includes eight speakers S _BC , S _BR ,
It has S _BL , S _FC , S _FR , S _FL , S _R , and S _L , and eight microphones M _BC , M _BR , M _BL , M _FC , M _FR , M _FL , M _R , and M _L. ing.

Further, the seat circuit section 20 includes eight microphones.
Rohon M_BC, M_BR, M_BL, M_FC, M _FR, M_FL, M_R, M_L
For extracting the noise signal from the output signal of
Eight difference calculator 21_-1~ 21_-8have. these
Eight difference calculator 21_-1~ 21_-8Each has a microphone
Rohon M_BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_L
Based on the signal component of the movie sound included in the output signal of
Quasi-voice signal S_RASupplied from the system controller 30
To be done. The system controller 30 includes a speaker 14
(See Fig. 1)
The timing signal TS is supplied.

Based on this timing signal TS, the system controller 30 causes the microphones M _BC , M _BR , M
_The corresponding reference audio signal S _RA is read from the storage device 33 at a timing synchronized with the signal components of the movie audio included in the output signals of _BL , M _FC , M _FR , M _FL , M _R , and M _L , and the difference calculation is performed. It is supplied to the vessels 21 _{-1 to} 21 _-8 .

In the eight difference calculators 21 _{-1 to} 21 _-8 , the microphones M _BC , M _BR , M _BL , M _FC , M _FR , M _FL ,
By subtracting the reference audio signal S _RA from the output signals of M _R and M _L , the noise signal S _NZ corresponding to the noise sound is extracted.

Further, the sheet circuit section 20 includes the noise signal S extracted by each of the eight difference calculators 21 _{-1 to} 21 _-8.
Generates a cancellation signal S _-NZ corresponding to canceling sound based on _NZ, the speaker S _{BC respectively, S BR, S BL, S} FC, S FR,
Eight noise signal prediction circuits 2 supplied to S _FL , S _R and S _L
It has 2 _{-1 to} 22 _-8 . In this case, the cancellation signal S _-NZ
The canceling signal S _-NZ is generated so that the canceling sound emitted by the sound corresponding to the noise sound included in the environmental sound at the time of the sounding. This makes it possible to favorably cancel the noise sound included in the environmental sound.

Each noise signal prediction circuit 22 _{-1 to} 22
_-8 from the system controller 30 to the microphones M _BC , M _BR , M _BL , M _FC , M _FR , M _FL , M _R , respectively.
The value of the parameter h that determines the advance time α of the environmental sound including the noise sound to be canceled by the canceling sound with respect to the environmental sound collected by M _L is input. By adjusting the value of the parameter h, it is possible to emit the canceling sound corresponding to the arbitrary advance time α, and the microphones M _BC , M _BR , M _BL , M _FC , and M
_From the time when the environmental sound is collected by _FR , M _FL , M _R , and M _L , the speakers S _BC , S _BR , S _BL , based on the collected environmental sound.
It is possible to deal with variations in the time α from S _FC , S _FR , S _FL , S _R , and S _L to the point when the canceling sound is emitted.

The seat circuit section 20 has a movement detecting section 16 for detecting the position of the seat 13 in the left-right direction, and a front-rear link switch 17 for setting a link with the front and rear seats 13. These front and rear link switches 17
Setting information and the detection output of the movement detector 16 are supplied to the system controller 30. The system controller 30 recognizes the setting of the grouping area based on the setting information of the front and rear link switch 17 of each sheet 13 and the detection output of the movement detector 16, and corresponds to the boundary of the grouping area and moves toward this grouping area. The cancellation sound is controlled to be emitted only from the speaker that emits the cancellation sound. For example, in order to prevent the cancellation sound from being emitted from a certain speaker, the cancellation signal S _-NZ is not output to the output side of the noise signal prediction circuit corresponding to the speaker.

FIG. 9 is a conceptual diagram showing the noise canceling operation. That is, the environmental sound at the time point T-α is input to the microphone M, and the output signal of the microphone M is supplied to the difference calculator 21. Then, the difference calculator 21 is supplied with the reference sound signal S _RA corresponding to the movie sound included in the environmental sound at the time point T-α, and the difference calculation with the output signal of the microphone M is performed. This allows
From the difference calculator 21, a noise signal S _NZ (T-α) corresponding to the noise sound included in the environmental sound at the time point T-α is obtained.

The noise signal S _NZ (T-α) thus obtained by the difference calculator 21 is supplied to the noise signal prediction circuit 22. In the noise signal prediction circuit 22, the time T at the time of input
From the noise signal S _NZ (T-α) at −α, a cancellation signal S _−NZ (T) in which the phase of the noise signal S _NZ (T) at a time point T in the future is inverted is generated. Then, the cancellation signal S _−NZ (T) is supplied to the speaker S.

As a result, when the environmental sound at the time point T reaches the user's ear 40, a canceling sound corresponding to the noise sound at the time point T reaches the user's ear 40 from the speaker S. Therefore, at the position of the user's ear 40, the noise sound is canceled from the environmental sound, and the user can only listen to the movie sound included in the environmental sound.

Next, details of the noise signal prediction circuit 22 will be described. FIG. 10 shows the configuration of the noise signal prediction circuit 22. The noise signal prediction circuit 22, the noise signal S _NZ and (T-alpha) input terminal 101 for inputting a, A for converting the noise signal S _NZ (T-α) into a digital signal by sampling at a predetermined sampling frequency / D converter 102
And a buffer memory 103 for temporarily storing the noise signal S _NZ (T-α) as a digital signal output from the A / D converter 102.

Further, the noise signal prediction circuit 22 uses the noise signal S _NZ (T-α) stored in the buffer memory 103.
_Therefore, a first tap selection circuit 104 and a second tap selection circuit 105 that selectively take out and output a plurality of sampling data located around the target position in the cancellation signal S _-NZ (T) to be created are provided. is doing. The first tap selection circuit 104 selectively extracts data used for prediction (data of prediction tap). The second tap selection circuit 105 selectively extracts data used for class classification (class tap data).

Further, the noise signal prediction circuit 22 detects a level distribution pattern from the data selectively extracted by the second tap selection circuit 105 as a feature quantity, and generates a class code CL based on this level distribution pattern. It has a class detection circuit 106.

In the class detection circuit 106, for example,
First, an operation for compressing each 8-bit data into 2 bits is performed. Here, data compression is performed by ADRC. In this case, the maximum value of each data is MAX, the minimum value is MIN, and the dynamic range is DR (= MAX-
If MIN + 1) and the requantization bit number is P, the requantization code qi as compressed data is obtained by the operation of the equation (1) for each data ki. However, (1)
In the formula, [] means a truncation process. Second
The number of data selected by the tap selection circuit 254 is N
When a, i = 1 to Na. qi = [(ki-MIN + 0.5) * ^2P / DR] (1)

In the class detection circuit 106, next, based on the requantization code qi obtained as described above, (2)
The class code CL indicating the class to which the data of the position of interest in the cancellation signal S _−NZ (T) to be created belongs is calculated by the equation.

[0057]

[Equation 1]

The noise signal predicting circuit 22 has a coefficient memory 107. The coefficient memory 107 stores coefficient data of an estimation formula used in an estimation / prediction calculation circuit 110, which will be described later, for each class. This coefficient data is used to cancel the noise signal S _NZ (T-α) and the cancellation signal S _-NZ (T).
It is the information for converting into. In the coefficient memory 107,
The class code CL output from the class detection circuit 106 described above is supplied as read address information. The coefficient data Wi corresponding to the class code CL is read out from the coefficient memory 107, and the estimated prediction calculation circuit 110 is read.
Is supplied to.

The noise signal prediction circuit 22 also has an information memory bank 108. In the estimation / prediction calculation circuit 110 described later, from the prediction tap data xi and the coefficient data Wi read from the coefficient memory 107,
The cancellation signal S to be created by the estimation formula of the formula (3)
_-Data y of the attention position of _NZ (T) is calculated. N in the equation (3) represents the number of prediction taps selected by the first tap selection circuit 104.

[0060]

[Equation 2]

Then, the coefficient data Wi of the estimation formula (i = 1
~ N) is a parameter h as shown in the equation (4), for example.
It is generated by a generating expression including. Information memory bank 1
In 08, coefficient seed data w _{i0 to} w _i3 which are coefficient data in this generation formula are stored for each class. A method for generating this coefficient seed data will be described later.

[0062]

[Equation 3]

Further, the noise signal prediction circuit 22 uses the coefficient seed data of each class and the value of the parameter h,
The coefficient generation circuit 109 for generating the coefficient data Wi (i = 1 to n) of the estimation formula corresponding to the value of the parameter h is provided for each class by the formula (4). The coefficient seed circuit 109 loads the coefficient seed data of each class described above from the information memory bank 108. The value of the parameter h is supplied to the coefficient generation circuit 109 from the system controller 30 (see FIG. 8).

The coefficient data Wi (i = 1 to n) of each class generated by the coefficient generation circuit 109 is stored in the coefficient memory 107 described above. The coefficient data Wi of each class is generated by the coefficient generation circuit 109 each time the value of the parameter h is changed.

Further, the noise signal prediction circuit 22 uses the prediction tap data xi selectively fetched by the first tap selection circuit 104 and the coefficient data Wi read from the coefficient memory 107 based on the class code CL.
The cancellation signal S to be created by the estimation formula of the formula (3)
_It has an estimation / prediction calculation circuit 110 for calculating the data y of the position of interest at _-NZ (T).

Further, the noise signal predicting circuit 22 includes a D / A converter 111 for converting the canceling signal S _-NZ (T) as a digital signal composed of the data y sequentially output from the estimating and predicting arithmetic circuit 110 into an analog signal. , And an output terminal 112 that outputs a cancellation signal S _−NZ (T) that is an analog signal.

Next, the operation of the noise signal prediction circuit 22 will be described. From the noise signal S _NZ (T-α) stored in the buffer memory 103, the second tap selection circuit 105
The data of the class tap located around the target position in the cancellation signal S _-NZ (T) to be created is selectively taken out. The data of the class tap selectively extracted by the second tap selection circuit 105 is supplied to the class detection circuit 106. In the class detection circuit 106, a level distribution pattern is detected from the data of the class taps as a feature amount, and based on this level distribution pattern, a class code CL indicating the class to which the data at the position of interest belongs is obtained ((2)). See formula).

This class code CL is used in the coefficient memory 10
7 as read address information. In the coefficient memory 107, in the coefficient generation circuit 109, the coefficient data Wi (i = 1 to n) of the estimation formula is used for each class by using the coefficient seed data w _{i0 to} w _ik , corresponding to the value of the parameter h. It is obtained and stored (see equation (4)). Coefficient memory 10
7, the class code CL is supplied as the read address information as described above, so that the coefficient memory 107
To coefficient data W of the estimation formula corresponding to the class code CL
i is read and supplied to the estimated prediction calculation circuit 110.

Also stored in the buffer memory 103
Noise signal S_NZFrom (T-α), the first tap selection circuit
At 104, the cancellation signal S to be created_-NZAttention in (T)
Data of the prediction taps located around the
Will be issued. In the estimation / prediction calculation circuit 110,
The data xi and the coefficient read from the coefficient memory 109
Based on the estimation formula of the formula (3) using the data Wi and
Cancellation signal S to be created _-NZData of the position of interest in (T)
y is calculated.

Then, the cancellation signal S _-NZ (T) consisting of the data y sequentially calculated by the estimation / prediction calculation circuit 110 is D / A.
It is output to the output terminal 112 after being converted into an analog signal by the converter 111.

As described above, in the noise signal prediction circuit 22, the coefficient data W of the estimation formula corresponding to the value of the parameter h is obtained.
i (i = 1 to n) is used to calculate the data y at the position of interest in the cancellation signal S _−NZ (T). Therefore, by adjusting the value of the parameter h, with respect to the environmental sound collected by the microphone M, an arbitrary advance time α of an environmental sound including a noise sound to be canceled by the canceling sound is set as an arbitrary advance time α. It is possible to obtain a canceling signal S _-NZ (T) capable of emitting a canceling sound corresponding to. In addition, the coefficient generation circuit 1 calculates the coefficient data Wi of each class corresponding to the value of the parameter h.
It is generated and used in 09, and a memory for storing a large amount of coefficient data is not needed, so that the memory can be saved.

Next, an example of a method of generating coefficient seed data will be described. Here, the coefficient seed data w _{i0 to} w _i3 (i =
1 to n) will be shown as an example. Here, for the following description, tj (j = 0 to 3) is defined as in Expression (5). t ₀ = 1, t ₁ = h, t ₂ = h ² , t ₃ = h ³ (5) When this equation (5) is used, equation (4) is rewritten as equation (6). To be

[0073]

[Equation 4]

Finally, the undetermined coefficient w _ij is obtained by learning. That is, a plurality of noise signals S _NZ (T
-Student signal data and cancellation signal S corresponding to α)
_The coefficient value that minimizes the squared error is determined using the data of the teacher signal corresponding to _-NZ (T). This is the so-called least squares method. Letting m be the number of learnings, e _{k be} the residual in the k (1 ≦ k ≦ m) th learning data, and E be the total sum of squared errors, E can be expressed as (7) by using equations (3) and (4). )
It is represented by a formula. Here, x _ik represents the k-th data at the i-th predicted tap position of the student signal, and y _k represents the data of the corresponding k-th teacher signal.

[0075]

[Equation 5]

In the method of least squares, w in equation (7) is used.
_ijW so that the partial derivative by _ijAsk for. this
Is expressed by equation (8).

[0077]

[Equation 6]

Below, as in equations (9) and (10), X
_{Defining ipjq} and Y _ip , equation (8) can be rewritten using a matrix as in equation (11).

[0079]

[Equation 7]

[0080]

[Equation 8]

This equation is generally called a normal equation. This normal equation is solved for w _ij using a sweeping method (Gauss-Jordan elimination method) or the like, and coefficient seed data is calculated.

FIG. 11 shows the concept of an example of the above-mentioned coefficient seed data generation method. A plurality of student signals corresponding to the noise signal S _NZ (T-α) are generated from the teacher signal corresponding to the cancellation signal S _-NZ (T). For example, the parameter h for changing the delay time α is varied in 9 steps to generate 9 types of student signals. Learning is performed between the plurality of student signals and the teacher signal generated in this way to generate coefficient seed data.

FIG. 12 shows the noise signal prediction circuit 2 described above.
Coefficient seed data generator 15 for generating coefficient seed data w _{10 to} w _n3 stored in the second information memory bank 108.
0 configuration is shown.

The coefficient seed data generating device 150 has a teacher signal ST (digital signal) corresponding to the cancellation signal S _-NZ (T).
Of the noise signal S _NZ (T-α) by delaying and inverting the input terminal 151 to which the
And a delay inverting circuit 152 that obtains a student signal SS corresponding to. The value of the parameter h corresponding to the value of the parameter h in the noise signal prediction circuit 22 (see FIG. 10) described above is input to the delay inverting circuit 152.
In the delay inverting circuit 152, the delay time α is changed based on this parameter h.

Further, the coefficient seed data generating device 150 selectively extracts, from the student signal SS output from the delay inverting circuit 152, a plurality of data located around the target position in the teacher signal ST and outputs the first data. It has a tap selection circuit 153 and a second tap selection circuit 154. These first and second tap selection circuits 153 and 154
Are respectively the first and the first of the noise signal prediction circuit 22 described above.
The second tap selection circuits 104 and 105 have the same configuration.

Further, the coefficient seed data generation device 150 detects a level distribution pattern from the data of the class taps selectively extracted by the second tap selection circuit 105 as a feature quantity, and based on this level distribution pattern, the teacher It has a class detection circuit 155 that generates a class code CL indicating the class to which the data at the position of interest in the signal ST belongs. The class detection circuit 155 is configured similarly to the class detection circuit 106 of the noise signal prediction circuit 22 described above.

Further, the coefficient seed data generating device 150 includes each data y of the target position obtained from the teacher signal ST supplied to the input terminal 151 and the first tap selection circuit 153 corresponding to each data y. The coefficient seed data for each class is calculated by using the prediction tap data xi selectively extracted in step 1, the value of the parameter h, and the class code CL generated by the class detection circuit 155 corresponding to each data y. normal equation for obtaining w ₁₀ ~w _n3 ((1
It has a normal equation generation unit 156 that generates (1) equation).

In this case, one piece of learning data is generated by combining one piece of data y and n pieces of prediction tap data xi (i = 1 to n) corresponding to the piece of data y. The delay time α in the delay inverting circuit 152 is changed corresponding to the change, a plurality of student signals SS are sequentially generated, and learning data is generated between the teacher signal ST and each student signal SS. As a result, the normal equation generation unit 156 generates a normal equation in which many learning data having different values of the parameter h are registered, and it becomes possible to obtain the coefficient seed data w _{10 to} w _n3 .

Further, the coefficient seed data generator 150 is supplied with the data of the normal equation generated for each class in the normal equation generator 156, solves the normal equation, and the coefficient seed data w _{10 for} each class. ~ Coefficient seed data determination unit 157 for calculating w _n3 and the calculated coefficient seed data w ₁₀ ~
and a coefficient seed memory 158 for storing w _n3 . In the coefficient seed data determination unit 157, the normal equation is solved by, for example, the sweep method, and the coefficient seed data is obtained.

The coefficient seed data generating device 150 shown in FIG.
The operation of will be described. The cancellation signal S is applied to the input terminal 151.
_-The teacher signal ST (digital signal) corresponding to _NZ (T) is supplied, and the delay inverting circuit 1 is applied to the teacher signal ST.
The delay inversion processing is performed at 52, and the noise signal S _NZ (T-
A student signal SS corresponding to α) is generated. in this case,
The value of the parameter h corresponding to the value of the parameter h in the noise signal prediction circuit 22 (see FIG. 10) is input to the delay inverting circuit 152. In the delay inverting circuit 152, the delay time α is changed based on this parameter h.

Further, from the student signal SS generated by the delay inverting circuit 152, the second tap selection circuit 154 selectively extracts the data of the class tap located around the target position in the teacher signal ST. The data of this class tap is supplied to the class detection circuit 155. In the class detection circuit 155, a level distribution pattern is detected from the data of the class taps as a feature amount, and based on this level distribution pattern, a class code CL indicating the class to which the data at the position of interest in the teacher signal ST belongs is generated. .

Further, from the student signal SS generated by the delay inversion circuit 152, the first tap selection circuit 153 selectively extracts the data of the prediction tap located around the target position in the teacher signal ST.

Then, each data y at the position of interest obtained from the teacher signal ST supplied to the input terminal 151 and the first tap selection circuit 15 corresponding to each data y, respectively.
Prediction tap data xi selectively extracted in 3 and
Using the value of the parameter h and the class code CL generated by the class detection circuit 155 corresponding to each data y, the normal equation generation unit 156 calculates the coefficient seed data w _{10 to} w _n3 for each class. To obtain the normal equation ((1
Equation 1) is generated.

Then, the coefficient seed data determination unit 157 solves each normal equation, and the coefficient seed data w _{10 to} w _{n3 for} each class.
Is determined, their coefficient seed data w ₁₀ to w _n9 are stored in the coefficient seed memory 158.

As described above, in the coefficient seed data generating device 150 shown in FIG. 12, the estimation formula (see formula (3)) for each class stored in the information memory bank 108 of the noise signal prediction circuit 22 of FIG. ) Coefficient data W used in
It is possible to generate the coefficient seed data w _{10 to} w _n3 which are the coefficient data in the generation formula (see the formula (4)) for obtaining i.

In the above-mentioned practical form, the system controller 30 recognizes the setting of the grouping area based on the setting information of the front and rear link switch 17 of each sheet 13 and the detection output of the movement detector 16. However, instead of providing the front-rear link switch 17 on each seat 13, each seat 13 can be moved in the front-rear direction, for example, in three steps, and a movement detector for detecting the movement is provided, and the left-right movement detection output At the same time, the movement detection outputs in the front-rear direction may be supplied to the system controller 30, and the system controller 30 may recognize the setting of the grouping area based on only those movement detection outputs.

Further, in the above-mentioned embodiment, the sheet 13 is arranged in the sheet area 12 as shown in FIG. 2, but the sheet 23 is arranged in the sheet area 12 as shown in FIG. You may This Figure 1
3, the parts corresponding to those in FIG. 2 are designated by the same reference numerals. Also in FIG. 13, the speaker and the microphone attached to the seat 23 are shown by solid lines even in the interior of the seat 23.

The seat 23 includes a base portion 23A, a backrest portion 23B which is connected to the upper end of the rear portion of the base portion 23A and has a cross-section that is convex rearward, and the base portion 2.
The armrest portion 23C is connected upward from both ends of 3A, and the leg portion 23D is connected to the lower surfaces of the base portion 23A and the backrest portion 23B.

The seat 23 is arranged on the rail 15 for moving the seat 23 in the left-right direction. The seat 23 can be moved in three steps in the left-right direction: a right position, a center position, and a left position. In this case, even if the position of the seat 23 is set to the left side position or the right side position, the other adjacent seats 1
The left side position and the right side position are set so as not to be in close contact with 3.

Further, in the backrest portion 23B of the seat 23, there is a speaker S _BC directed toward the rear straight direction at the center of the rear surface,
A speaker S _BR of the rear right toward the rear obliquely rightward, a speaker S _BL to the rear left toward the rear obliquely leftward, a speaker S _FC toward the front straight ahead to the front center, front diagonal left to right front A speaker S _FR directed in the direction and a speaker S _FL directed diagonally forward to the right are provided on the left side of the entire surface. These speakers S _BC , S _BR , S _BL , S _FC , S _FR and S _FL are
The electro-acoustic conversion means is configured to emit a canceling sound for canceling a noise sound.

Also, on the backrest portion 23B of the seat 23,
Is the speaker S_BC, S_BR, S_BL, S_FC, S_FR, S_FLToso
Microphone M for each pair_BC, M_BR, M_BL, M_FC，
M_FR, M_FLIs provided. These microphones
M_BC, M_BR, M_BL, M_FC, M_FR, M _FLAcoustoelectric conversion
It is for constituting a means and collecting environmental sounds.

The microphone M _BC is for collecting the environmental sound traveling in the backward straight direction. Microphone M
_BR is for collecting environmental sound that is directed diagonally rearward and to the right. The microphone M _BL is for collecting environmental sound that is directed rearward and diagonally to the left. Microphone M _FC
Is for collecting the environmental sound traveling in the forward straight direction. The microphone M _FR is for collecting environmental sound directed diagonally to the front left. The microphone M _FL is for collecting environmental sound directed diagonally to the front right.

The right side of the backrest portion 23B of the seat 23
At the end, the speaker S facing left _RIs provided
It Similarly, on the left end of the back portion 23B of the seat 23
Is the speaker S pointing to the right_LIs provided. This
These are the speakers S_R, S_LConstitutes electroacoustic conversion means
To cancel the noise and cancel the noise.
It is a thing.

Microphones M _R and M _L are provided at the right and left ends of the backrest portion 13B of the seat 13 in pairs with the speakers S _R and S _L , respectively. These microphones M _R and M _L constitute acoustoelectric conversion means and collect environmental sounds. The microphone M _R is for collecting the environmental sound directed to the left. The microphone M _L is for collecting environmental sound directed to the right.

A control panel 25 is provided on the back side of the backrest portion 13B of the seat 13. Figure 14
The specific structure of the control panel 25 is shown. The control panel 25 is provided with eight operation keys 26 _{-1 to} 26 _-8 that are used when the user sets to cancel the noise sounds coming from the eight directions toward the seat 23. There is. By repeatedly pressing each operation key, the offset setting can be alternately turned on and off. Further, a light emitting element is arranged at each operation key portion, and is turned on in the on state and turned off in the off state. The control panel 25 constitutes a grouping area setting means. The offset setting information by each operation key of the control panel 25 is supplied to the system controller 30 (see FIG. 8) that controls the noise offset operation in the plurality of sheets 23 arranged in the sheet area 12.

The system controller 30 uses each seat 2
Based on the cancellation setting information from the control panel 25 of No. 3, control is performed so that the cancellation sound is emitted only from the speaker that corresponds to the boundary of the grouping area and emits the cancellation sound toward the grouping area. Becomes As a result, noise sounds from outside the area can be eliminated and conversation can be shared in the grouping area.

Further, in the above-described embodiment, the grouping area is set based on the setting of the horizontal movement detector 16 and the front and rear link switch 17 corresponding to each sheet 13, but the operator operates it. Part 3
It may be possible to arbitrarily set it by the operation of 1.

Further, in the noise signal predicting circuit 22 in the above-described embodiment, the coefficient generating circuit 109 uses the coefficient seed data w _{10 to} w _n3 of each class to calculate the coefficient data Wi ( i = 1 to n) is generated and stored in the coefficient memory 107 for use. However, for example, coefficient data Wi (i = i = i) of each class corresponding to each value of the parameter h is stored in the information memory bank 108. 1
To n) are stored in advance, and the information memory bank 10
The coefficient data Wi (i = 1 to n) of each class corresponding to the value of the parameter h may be read from 8 and stored in the coefficient memory 107 for use.

Further, in the noise signal predicting circuit 22 in the above-mentioned embodiment, the one using the linear linear equation as the estimation formula when generating the data y of the position of interest in the cancellation signal S _-NZ (T) has been mentioned. However, the present invention is not limited to this, and it is possible to use a higher-order equation as an estimation formula, for example.

Further, in the above-mentioned embodiment, it is assumed that the front and rear seats 13 and 13 are arranged on the same plane as shown in FIG. 15A. The same can be applied to the case in which 13, 13 are arranged in a staircase as shown in FIG. 15B. In that case, the directions of the speaker S and the microphone M which are attached to the backrest portion 13B of the seat 13 and which face the front-rear direction are as follows.
For example, the direction may be along the slope of this staircase.

[0111]

According to the seat system of the present invention, it is possible to set a grouping area composed of one sheet or two or more sheets, and an external noise sound is emitted only from the sound emitting portion corresponding to the boundary of the grouping area. The configuration is such that the canceling sounds that cancel each other are emitted. In the grouping area, noise sounds from outside the area can be eliminated and conversation can be shared.

Further, according to the external noise canceling apparatus of the present invention, a plurality of sound collecting parts for collecting environmental sounds from a plurality of directions and a plurality of sound collecting parts are provided in pairs. Equipped with multiple sound emission units that emit a canceling sound to cancel the noise sound based on the environmental sound collected by the multiple sound collection units, class classification adaptation from the noise signal extracted from the environmental sound signal Since the cancellation signal is obtained by the processing, the external noise sound can be canceled well.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a movie theater to which a seat system according to the present invention is applied.

FIG. 2 is a diagram showing a schematic configuration of a seat.

FIG. 3 is a conceptual diagram of grouping (number of sheets: left and right 2).

FIG. 4 is a conceptual diagram of grouping (number of sheets: left and right 2 × front and back 2).

FIG. 5 is a diagram for explaining an external noise canceling operation (the number of sheets: 1).

FIG. 6 is a diagram for explaining an external noise canceling operation (number of sheets: left and right 2).

FIG. 7 is a diagram for explaining an external noise canceling operation (number of sheets: left and right 2 × front and back 2).

FIG. 8 is a block diagram showing a circuit configuration relating to a noise canceling operation.

FIG. 9 is a conceptual diagram showing a noise sound canceling operation.

FIG. 10 is a block diagram showing a configuration of a noise signal prediction circuit.

FIG. 11 is a diagram for explaining a method of generating coefficient seed data.

FIG. 12 is a block diagram showing a configuration of a coefficient seed data generation device.

FIG. 13 is a diagram showing another schematic configuration of the seat.

FIG. 14 is a diagram showing a specific configuration of a control panel.

FIG. 15 is a diagram showing an example of an arrangement surface of a seat in the front-rear direction.

[Explanation of symbols]

10 ... Cinema, 12 ... Seat area, 13, 2
3 ... Seat, 13A ... Base, 13B ... Backrest part, 13C ... Armrest part, 13E ... Arm part, 15 ... Rail, 16 ... Movement detector, 17.
..Front and rear link switches, 20 ... Seat circuit section, 2
1,21 _{-1 to} 21 _-8 ... Difference calculator, 22, 22 _-1 to
22 _-8 ... Noise signal prediction circuit, 30 ... System controller, 31 ... Operating section, 32 ... Display section,
33 ... Storage device, 101 ... Input terminal, 103 ...
..Buffer memory, 104 ... First tap selection circuit, 105 ... Second tap selection circuit, 106 ...
Class detection circuit, 107 ... Coefficient memory, 108 ...
.Information memory bank, 109 ... Coefficient generation circuit, 11
0 ... Estimative prediction arithmetic circuit, 112 ... Output terminal, 1
50 ... Coefficient seed data generator, 151 ... Input terminal, 152 ... Delay inversion circuit, 153 ... First tap selection circuit, 154 ... Second tap selection circuit, 1
55 ... Class detection circuit, 156 ... Normal equation generation unit, 157 ... Coefficient seed data determination unit, 158 ...
Coefficient seed memory

Claims (8)

[Claims] 1. A plurality of sound collecting units that collect environmental sounds from a plurality of directions, respectively, and cancellation for canceling noise sounds based on the respective environmental sounds collected by the plurality of sound collecting units. A plurality of sheets each provided with a plurality of sound emitting portions, a region setting means for setting a grouping region including one or more sheets from the plurality of sheets, and the region setting And a control unit that controls to emit the canceling sound only from the sound emitting unit that emits the canceling sound toward the inside of the grouping region corresponding to the boundary of the grouping region set by the means. Seat system to do. 2. The seat is movable in the left-right direction, and the area setting means includes a movement detector for detecting the movement of the seat in the left-right direction, and a front and rear portion provided at a predetermined position of the seat. 2. A link setting device for setting a link with a sheet, wherein the grouping area is set based on the detection output of the movement detector and the setting of the link setting device. Seat system described. 3. The seat is capable of moving in the left-right direction and in the front-rear direction, and the area setting means includes a first movement detector for detecting movement of the seat in the left-right direction, A second movement detector that detects movement of the seat in the front-rear direction, and sets the grouping area based on the detection output of the first movement detector and the detection output of the second movement detector. The seat system according to claim 1, wherein: 4. The area setting means has a setting device which is provided at a predetermined position of the sheet and which sets the arrival directions of noise sounds to be canceled, and the grouping region is set based on the setting of the setting device. The seat system according to claim 1, wherein: 5. The sound collecting section has acoustoelectric conversion means for converting the collected environmental sound into an electric signal, and the sound emitting section outputs the acoustoelectric conversion means of the corresponding sound collecting section. Based on the noise signal extraction means for extracting a noise signal corresponding to the noise sound from the signal, and the noise signal extracted by the noise signal extraction means, the noise signal extraction means is located around the position of interest in the cancellation signal corresponding to the cancellation sound. First data selecting means for selecting a plurality of first data, and the plurality of first data selected by the first data selecting means
Class detecting means for detecting the class to which the data of the position of interest belongs, and coefficient data generating means for generating coefficient data of an estimation formula corresponding to the class detected by the class detecting means, Based on the noise signal extracted by the noise signal extraction means, a second data selection means for selecting a plurality of second data located around the target position in the cancellation signal, and the coefficient data generation means are generated. Using the coefficient data and the plurality of second data selected by the second data selecting means, the calculating means for calculating the data of the position of interest in the cancellation signal based on the estimation formula, and the calculating means The seat system according to claim 1, further comprising an electroacoustic conversion unit that converts a cancellation signal formed of the acquired data into a cancellation sound. 6. A value of a parameter for determining the amount of advance of an environmental sound including a noise sound to be canceled by the canceling sound with respect to the environmental sound collected by the sound collecting unit is input to the sound emitting unit. The method further comprises parameter input means, wherein the coefficient data generation means generates coefficient data of an estimation formula corresponding to the class detected by the class detection means and the value of the parameter input to the parameter input means. The seat system according to claim 5, characterized in that 7. An environment in which a plurality of sound collecting units for collecting environmental sounds from a plurality of directions and a pair of the plurality of sound collecting units are provided, respectively, and the sound is collected by the plurality of sound collecting units. And a plurality of sound emitting units that emit a canceling sound for canceling a noise sound based on the sound, and the sound collecting unit includes an acoustoelectric conversion unit that converts the collected environmental sound into an electric signal. The sound emitting unit has a noise signal extracting unit that extracts a noise signal corresponding to the noise sound from the output signal of the acoustoelectric conversion unit of the corresponding sound collecting unit, and the noise signal extracting unit extracts the noise signal. Based on a noise signal, a first data selecting unit that selects a plurality of first data located around a target position in the canceling signal corresponding to the canceling sound, and the first data selecting unit selects the first data. Based on multiple first data, the above attention Class detecting means for detecting the class to which the position data belongs, coefficient data generating means for generating coefficient data of the estimation formula corresponding to the class detected by the class detecting means, and noise signal extracting means Second data selecting means for selecting a plurality of second data located around the position of interest in the canceling signal based on the noise signal; coefficient data generated by the coefficient data generating means; Using a plurality of second data selected by the data selecting means, a calculating means for calculating the data of the position of interest in the canceling signal based on the estimation formula, and a canceling signal composed of the data calculated by the calculating means, An external noise canceling device, comprising: an electro-acoustic converting means for converting into a canceling sound. 8. The value of a parameter for determining the amount of advance of an environmental sound including a noise sound to be canceled by the canceling sound with respect to the environmental sound collected by the sound collecting unit is input to the sound emitting unit. The method further comprises parameter input means, wherein the coefficient data generation means generates coefficient data of an estimation formula corresponding to the class detected by the class detection means and the value of the parameter input to the parameter input means. The external noise canceling device according to claim 7, which is characterized in that.