CN108710106A - A kind of active head rest device based on infrared positioning - Google Patents
A kind of active head rest device based on infrared positioning Download PDFInfo
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- CN108710106A CN108710106A CN201810461755.XA CN201810461755A CN108710106A CN 108710106 A CN108710106 A CN 108710106A CN 201810461755 A CN201810461755 A CN 201810461755A CN 108710106 A CN108710106 A CN 108710106A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/16—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
- G10K11/17817—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17823—Reference signals, e.g. ambient acoustic environment
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/103—Three dimensional
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3027—Feedforward
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/321—Physical
- G10K2210/3221—Headrests, seats or the like, for personal ANC systems
Abstract
The invention discloses a kind of active head rest device based on infrared positioning, which includes：Secondary sound source, reference microphone and control system；Described device further includes：Infrared range-measurement system and positioning system, the controller include optimum control coefficient data library；The number of the infrared range-measurement system is at least 3；The positioning system determines position of the head of people in zone of action according to the range information that infrared range-measurement system provides, and it is sent to control system, according to the position on the head of people optimal controller coefficient is obtained from optimal controller coefficient data library, the reference signal that reference microphone is acquired according to the coefficient be filtered after by being sent to secondary sound source, secondary sound source is set to make a sound, to realize noise abatement.The device of the invention after obtaining control targe position by choosing the pre-designed optimal controller coefficient in current location, to which the head of guarantor can also be stablized when moving, consistent noise abatement effect.
Description
Technical field
The present invention relates to active noise controlling field, more particularly to a kind of active head rest device based on infrared positioning.
Background technology
In conventional noise control field, the noise in space is reduced usually using sound insulation, sound-absorbing material, this method is to height
Frequency noise abatement effect is preferable, but if also to reach identical control effect to low-frequency noise, then needs larger volume, again
Amount, such mode increase cost and impracticable in a practical situation.Therefore for low-frequency noise, it will usually using actively making an uproar
The method of acoustic control reduces low-frequency noise, i.e., sends out reversed sound wave by loud speaker to offset original under current location make an uproar
Sound, reaches the method for reducing noise, these loud speakers are referred to as secondary sound source.Active noise controlling is also claimed in the document having
For " Active noise control " (Active noise control, ANC).
The basic thought of Active noise control was suggested in 1936, and the purpose most started is sent out instead by secondary sound source
The plane wave propagated in pipeline is offset to sound wave.Active noise control apply most successful field in active noise reduction earphone,
Since ear canal diameter is smaller, low frequency is propagated when being propagated in duct in a manner of plane wave, as long as therefore making Mike on the outside of earphone
Wind receives the noise of extraneous incoming duct, and the diaphragm of loudspeaker of earphone is made to send out the sound opposite with noise amplitude same phase
Wave can realize the purpose of the noise reduction at eardrum.
But for three dimensions, since sound wave passes to target point by all directions, if carrying out noise to overall space
Control, the sub-quantities needed are more and uncontrollable, and system complexity will be very high, and therefore, more rational method is only
Some or certain several error dots are controlled.This method is exactly local active noise abatement.In head restraint systems, target point
It is at the ears of people.As long as so that noise is effectively controlled at people's ears, the comfort of people can be effectively promoted.In reality
In the system of border, system complexity, stability and control effect are considered, non-adaptive system, this system can be used to exist
One timing controlled effect of environment is preferable.
United States Patent (USP) US 8,325,934 and United States Patent (USP) 9,640,167 etc. refer to the method with active head restraint systems
To the method that the noise under prone position at number of people ears is controlled, but in view of in true environment, the position of the number of people can occur
Variation, at this point, the position (target point) of people's ears can change, secondary path can also change correspondingly, at this time the control of system
Effect can decline.Southampton University of Southampton proposes to carry out number of people position for the commercial external member of VR systems using some accurate
Positioning, but make system bulk and occupied space very big, cost is very high, and system complexity improves therewith.
In conclusion using active head restraint systems control when changing to number of people position of active noise controlling at present
Effect is general, and while using third party's business software so that system bulk is larger, and flexibility is poor.
Invention content
It is an object of the present invention to which to solve the above problems, a kind of active head rest device based on infrared positioning of proposition, is somebody's turn to do
For device under the premise of not influencing people's comfort, still there is consistent noise abatement effect on the head of guarantor in moving process
Fruit.
For achieving the above object, the present invention provides a kind of active head rest device based on infrared positioning, the devices
Including：Secondary sound source, reference microphone and control system；Described device further includes：Infrared range-measurement system and positioning system, the control
Device processed includes optimum control coefficient data library；The number of the infrared range-measurement system is at least 3；The positioning system is according to infrared
The range information that rangefinder provides determines position of the head of people in zone of action, and is sent to control system, according to people's
The position on head obtains optimal controller coefficient from optimal controller coefficient data library, is acquired to reference microphone according to the coefficient
Reference signal be filtered after by being sent to secondary sound source, so that secondary sound source is made a sound, to realize noise abatement.
As a kind of improvement of above-mentioned apparatus, the number of the infrared range-measurement system is 6, wherein four are uniformly located at people's
The top on head, other two are located at the both sides on the head of people.
As a kind of improvement of above-mentioned apparatus, the number of the secondary sound source is 4, and the left and right sides on the head of people is respectively arranged
Two.
As a kind of improvement of above-mentioned apparatus, the positioning system includes：Lateral distance acquisition module, fore-and-aft distance obtain
Module and sending module；
The lateral distance acquisition module obtains range information for the infrared range-measurement system at left and right sides of the head according to people
The center on the head of people is obtained afterwards to the lateral distance of zone of action central point；
The fore-and-aft distance acquisition module, it is red with the top of the lateral distance most proximity for being chosen according to lateral distance
Outer rangefinder, the distance on the measurement crown to infrared range-measurement system, and the size on the head according to common people, obtain the head center of people
Fore-and-aft distance of the point to the infrared range-measurement system of the head top of people；
The sending module, for the dynamic bit using lateral distance and fore-and-aft distance as the head of people in zone of action
It sets, is sent to control system.
As a kind of improvement of above-mentioned apparatus, the control system includes optimal controller coefficient data library, controller system
Number acquisition module, A/D converter, D/A converter, digital signal processor and power amplifier.
Optimum control coefficient data library, the number of each site for storing the division in zone of action, position
With the optimal controller coefficient under the position；
The controller coefficient acquisition module, the location information for being sent according to positioning system, from optimal controller system
Number database finds the location point and its number of immediate division therewith, chooses the optimal controller coefficient under the position；
The A/D converter, the analog signal for acquiring reference microphone are converted to pending digital signal simultaneously
It is input in digital signal processor；
The digital signal processor, for being filtered and calculating behaviour to digital signal using optimal controller coefficient
Make, and the result after calculating is exported with digital signal form to D/A converter；
The D/A converter, the digital signal for exporting digital signal processor are converted to analog signal；
The power amplifier, the analog signal for exporting D/A converter are amplified and give secondary sound source, make secondary
Grade sound source makes a sound.
As a kind of improvement of above-mentioned apparatus, the optimal controller coefficient wopT is：
wopt=-{ E[RT(n)R(n)]}-1E[RT(n)d(n)] (1)
Wherein,rl(n)=[rl1(n),rl2(n),...rlM
(n)]TIt is vectorial for filter-x,For each filter-x signals；Wherein n is time point serial number, M
For secondary sound source number, m is secondary sound source serial number and 1≤m≤M, L target point number in order to control, l in order to control target point serial number and
1≤l≤L, L=2, J are the length of sampling, and the exponent number of I device coefficients in order to control, x (n) is the reference signal obtained in reference point, d
(n) it is target point initial noisc.
The advantage of the invention is that：
1, compared with prior art, under the premise of not accounting for excessive space, not increasing system complex, the device of the invention
The method for taking infrared positioning judges number of people position, to improve active head rest device to the control performance of noise, have
Preferable robustness；
2, the device of the invention after obtaining control targe position by choosing the pre-designed optimum control in current location
Device coefficient, to which the head of guarantor can also be stablized when moving, consistent noise abatement effect.
Description of the drawings
Fig. 1 is the schematic diagram for having pillow head rest device based on infrared positioning of the present invention；
Fig. 2 is feedforward active control principle；
Fig. 3 is binary channels feedforward arithmetic flow chart；
Fig. 4 is that the system controls front and back noise vs' figure in Zuo Erchu；
Fig. 5 is that the system controls front and back noise vs' figure at auris dextra.
Specific implementation mode
The present invention will be described in detail in the following with reference to the drawings and specific embodiments.
As described in Figure 1, the present invention provides a kind of active head rest device based on infrared positioning, which includes：It is infrared
Rangefinder, secondary sound source, reference microphone, positioning system and control system；The device determines control targe by infrared positioning
The pre-designed controller coefficient in current location is chosen behind position, the head of people can also be stablized, is consistent when moving
Noise abatement effect.
The infrared range-measurement system measures the distance that target (number of people) arrives each infrared range-measurement system at interval of a period of time；It is preferred that
, the number of the infrared range-measurement system is 6, and the top on four heads for being uniformly located at people, other two is located at people's
The both sides on head.
The reference microphone is input to control system for acquisition and the relevant noise signal of noise to be controlled；
The secondary sound source, the analog signal for sending control system are converted to acoustical signal so that the sound sent out
, opposite in phase identical as original magnitude of sound when at target is reached, to achieve the purpose that noise abatement.
The positioning system, for handling the distance signal that infrared range-measurement system measures, analysis obtain target (people's
Head) center position information, and the location information is supplied to control system；
First, infrared range-measurement system acquires a data at interval of certain time, is obtained according to left and right sides big after range information
It causes to judge the center on the head of people to the lateral distance of zone of action central point；
Then the infrared range-measurement system with the top of the lateral distance most proximity is chosen according to the lateral distance, measures the crown and arrives
The distance of infrared range-measurement system, and the size on the head according to common people are inferred to the head center point of people to the head top of people
Infrared range-measurement system distance；
Using Kalman filtering or other signal processing methods, dynamic position of the head in zone of action of people is obtained, really
The position for determining number of people central point, to reduce the noise at human ear.
The control system includes optimal controller coefficient data library, controller coefficient acquisition module, A/D converter, D/A
Converter, digital signal processor and power amplifier.
Optimal controller coefficient data library, the number of each site for the division in storage region, position and
Optimal controller coefficient under the position：
Multiple sites are divided in zone of action first, and are numbered at each dot location.
Fig. 2 is active feedforward system control principle, and Fig. 3 is the control system for two secondary sources, feed forward control method
Flow chart.The path information under secondary sound source to each predetermined location at number of people ears is measured first, obtains secondary path biography
Delivery function glm, wherein l, m is respectively the subscript of loud speaker and microphone (error dot).
Usually when measuring secondary path, each loud speaker is made to send out white noise respectively, is received at error dot (at people's ears)
Noise obtains the estimation of secondary path model by the algorithm of System Discrimination.
System design is carried out to the controller coefficient under preset each position using based on the minimum criterion in side,
Optimization aim when system designs is that residual noise e (n)=d (n)+y (n) at target point (at number of people ears) is minimum, wherein d
(n) and y (n) is respectively the sound of target point initial noisc and all secondary sound sources to error dot, is obtained optimal under the position
Controller coefficient：
wopt=-{ E[RT(n)R(n)]}-1E[RT(n)d(n)] (1)
Wherein,rl(n)=[rl1(n)rl2(n)...rlM(n)
]TIt is vectorial for filter-x,For each filter-x signals.Wherein n is time point serial number, and M is secondary
Grade sound source number, m are secondary sound source serial number and 1≤m≤M, L target point number in order to control, l target point serial number and 1≤l in order to control
≤ L, within the system L=2, J are the length of sampling, and the exponent number of I device coefficients in order to control, x (n) is the reference obtained in reference point
Signal, d (n) are target point initial noisc.
The optimal controller coefficient w of control system is calculated separately out under each positionopt, it is all stored in control system
In.
Controller coefficient acquisition module, the location information for being obtained according to positioning system, from optimum control coefficient data
The location point and its number of immediate division therewith are found in library, choose the optimal controller coefficient under the position；
The A/D converter, the analog signal for acquiring reference microphone are converted to pending digital signal simultaneously
It is input in digital signal processor；
The digital signal processor completes calculating and filtering operation, based on the principle of sound wave superposition, most according to selection
Excellent controller coefficient, reference signal send out reversed sound wave, s after control system digital filtering by secondary sound sourcem(n)=
wm TX (n) is the sound that m-th of secondary source is sent out, and wherein x (n) is the reference signal vector of reference signal x (n) compositions, the signal
After reaching target point, noise original at target point is offset according to principle of stacking, realizes the purpose of noise abatement.
The digital signal that digital signal processor exports is converted to analog signal by the D/A converter；
The power amplifier amplifies and gives the analog signal that D/A converter exports to secondary sound source, and secondary sound source is made to send out
Go out sound, to realize the purpose of noise abatement.
Fig. 4 and Fig. 5 is the practical front and back noise power spectrum comparison diagram of control at ears.Left and right ear is made an uproar before being in the system operation
The frequency spectrum of sound is as shown by the solid line, shown in dotted line after operating system.The system realizes effective control to 700Hz or less low-frequency noises
System, whole noise reduction is respectively 9.4dB and 9.9dB.
It should be noted that due to control system in any position under all use optimal control coefrficient, the number of people can be with
Control effect that is optimal and stablizing can be obtained in movable region.
It should be noted that the active head rest device described in the invention based on infrared positioning can use various ways reality
It is existing, for example, hardware, software either software and hardware combination.Hardware platform can be FPGA, PLD or other special integrated electricity
Road ASIC.Software platform includes DSP, ARM or other microprocessors.The combination of software and hardware such as part of module is soft with DSP
Part realizes that part of module such as FFT realizes with hardware accelerator.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be understood by those of ordinary skill in the art that, to the technical side of the present invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Right in.
Claims (6)
1. a kind of active head rest device based on infrared positioning, the device include：Secondary sound source, reference microphone and control system
System；It is characterized in that, described device further includes：Infrared range-measurement system and positioning system, the controller include optimum control coefficient
Database；The number of the infrared range-measurement system is at least 3；The range information that the positioning system is provided according to infrared range-measurement system
It determines position of the head of people in zone of action, and is sent to control system, according to the position on the head of people from optimum control
Device coefficient data library obtains optimal controller coefficient, after the reference signal acquired to reference microphone according to the coefficient is filtered
By being sent to secondary sound source, secondary sound source is set to make a sound, to realize noise abatement.
2. the active head rest device according to claim 1 based on infrared positioning, which is characterized in that the infrared range-measurement system
Number be 6, wherein the top on four heads for being uniformly located at people, other two is located at the both sides on the head of people.
3. the active head rest device according to claim 1 or 2 based on infrared positioning, which is characterized in that the secondary sound
The number in source is 4, and the left and right sides on the head of people is respectively arranged two.
4. the active head rest device according to claim 1 or 2 based on infrared positioning, which is characterized in that the positioning system
System includes：Lateral distance acquisition module, fore-and-aft distance acquisition module and sending module；
The lateral distance acquisition module, is obtained after obtaining range information for the infrared range-measurement system at left and right sides of the head according to people
Take the center on the head of people to the lateral distance of zone of action central point；
The fore-and-aft distance acquisition module, for choosing the infrared survey with the top of the lateral distance most proximity according to lateral distance
Distance meter, the distance on the measurement crown to infrared range-measurement system, and the size on the head according to common people, the head center point for obtaining people arrive
The fore-and-aft distance of the infrared range-measurement system of the head top of people；
The sending module, for the dynamic position using lateral distance and fore-and-aft distance as the head of people in zone of action, hair
It send to control system.
5. the active head rest device according to claim 4 based on infrared positioning, which is characterized in that the control system packet
Include optimal controller coefficient data library, controller coefficient acquisition module, A/D converter, D/A converter, digital signal processor
And power amplifier；
Optimum control coefficient data library, the number of each site for storing the division in zone of action, position and should
Optimal controller coefficient under position；
The controller coefficient acquisition module, the location information for being sent according to positioning system, from optimal controller coefficient number
The location point and its number that immediate division therewith is found according to library choose the optimal controller coefficient under the position；
The A/D converter, the analog signal for acquiring reference microphone are converted to pending digital signal and input
Into digital signal processor；
The digital signal processor, for being filtered to digital signal using optimal controller coefficient and calculating operation, and
Result after calculating is exported with digital signal form to D/A converter；
The D/A converter, the digital signal for exporting digital signal processor are converted to analog signal；
The power amplifier, the analog signal for exporting D/A converter are amplified and give secondary sound source, make secondary sound
Source makes a sound.
6. the active head rest device according to claim 5 based on infrared positioning, which is characterized in that the optimal controller
Coefficient woptFor：
wopt=-{ E[RT(n)R(n)]}-1E[RT(n)d(n)] (1)
Wherein,rl(n)=[rl1(n),rl2(n),...rlM(n)]TFor
Filter-x vectors,For each filter-x signals；Wherein n is time point serial number, and M is secondary sound
Source number, m are secondary sound source serial number and 1≤m≤M, L target point number in order to control, l target point serial number and 1≤l≤L in order to control,
L=2, J are the length of sampling, and the exponent number of I device coefficients in order to control, x (n) be the reference signal obtained in reference point, and d (n) is mesh
Punctuate initial noisc.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112233643A (en) * | 2020-10-15 | 2021-01-15 | 南京南大电子智慧型服务机器人研究院有限公司 | Method for inhibiting water bed effect of self-adaptive feedback active control system |
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