EP2122607A2 - Procede de reduction active d'une nuisance sonore - Google Patents
Procede de reduction active d'une nuisance sonoreInfo
- Publication number
- EP2122607A2 EP2122607A2 EP08775674A EP08775674A EP2122607A2 EP 2122607 A2 EP2122607 A2 EP 2122607A2 EP 08775674 A EP08775674 A EP 08775674A EP 08775674 A EP08775674 A EP 08775674A EP 2122607 A2 EP2122607 A2 EP 2122607A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- noise signal
- noise
- filter
- counter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- 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
- G10K11/17855—Methods, e.g. algorithms; Devices for improving speed or power requirements
-
- 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
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
Definitions
- the present invention relates to a method of reducing noise pollution by active control. It also relates to a system implementing the method according to the invention.
- the invention aims, in particular, to reduce noise pollution in an area determined by an active reduction process.
- Noise can be any kind of annoying acoustic waves that can be considered noise in a certain area.
- These nuisances can be of all types and frequencies ranging from a few hertz to a few thousand hertz. They can be created by any device in operation. In the case, for example, of a closed enclosure, the nuisances can be generated by devices which are located inside this enclosure. They may also be caused by sources outside the enclosure, for example when the enclosure is located near sites such as an airport, highway, railway, etc.
- the first requires prior information of the noise signal which is the cause of the noise nuisance to be reduced.
- the noise signal is detected upstream of the active reduction processing zone and provides a reference signal which must be strongly correlated with the noise nuisance to be reduced.
- prior knowledge of the noise signal is exploited in order to minimize the error of reduction of the noise nuisance, this error being quantified by a so-called error signal measured at the determined zone.
- the prior information of a noise nuisance is not always available, hence the use of a second noise reduction method, called feedback, or closed loop control, in which no prior detection is required. is done.
- the reduction error signal is used to provide a control signal for minimizing this same error signal.
- An object of the invention is thus to provide a method of actively reducing noise pollution to better meet the constraint cited above, and therefore to achieve a better reduction of noise.
- the invention proposes to remedy the aforementioned problem by an active reduction method at a given zone of the energy of a sound signal, said propagated noise signal, generated in the zone determined by a primary signal, said signal noise.
- the method comprises transmitting, by transmission means, at least one counter-noise signal comprising at least a first counter-noise signal, said feedback, of an antagonistic effect to the propagated noise signal, this method further comprising at least one iteration of the following operations:
- the sources of the noise signal are called the secondary sources and the sources of the noise signal are the primary sources.
- the measurement of the error signal by a measuring means constituted for example by a control microphone, makes it possible to account for the reduction of the energy of the propagated noise signal and to adjust the noise signal of to reduce this same error signal.
- the modeling of the secondary path can be carried out by transmitting, by a means of transmitting the counter-noise signal consisting for example of a loudspeaker, of a known signal, followed by a measurement of this signal at the level of the area determined by a measuring device.
- the transmitted signal and the measured signal it is possible to characterize the acoustic path between the emission means of the counter-noise signal and the measurement means at the determined zone. This modeling can take place before or during any phase of emission of noise.
- This determined path, and always before any reduction of the noise signal, modeling the inverse of the secondary path can be performed numerically so as not to introduce phase shift that is to say additional delay in the control chain , which would come in opposition to the main purpose of the invention. An amplitude modeling only is therefore conducted.
- This inverse filter makes it possible to limit the resonances inherent to the electro-acoustic equipment used as well as to the topography of the treatment zone, resonances that are found in said secondary path.
- the detection of the periodic components of the propagated noise signal makes it possible to better understand the spectral composition of said signal and consequently makes it possible to carry out bandpass filtering operations.
- the counter-noise signal can thus be adjusted optimally to ensure, in greater stability, the best reduction of the energy of the propagated noise signal and thus of the nuisance caused by the noise signal at the zone level. determined, especially during rapid changes in periodic components.
- the propagated noise signal can be estimated from, on the one hand, the error signal, and on the other hand the feedback noise signal processed by the first filter modeling the secondary path. Indeed, by subtracting from the error signal measured in the determined zone, the counter-noise signal feedback filtered by the first filter modeling the secondary path, that is to say the acoustic path between the secondary source and the measuring means at the determined area, it is possible to make an estimate of the noise signal propagated to the reduce.
- the detection of the periodic components of the propagated noise signal can be achieved by a filtering of the propagated noise signal estimated by notch-type bandpass filters, performing an infinite impulse response (HR) bandpass filtering. of constant amplitude everywhere except at the frequencies of the periodic components of the propagated noise signal where the bandwidths are practically nil. These filters are called Adaptive Notch Filters (ANF).
- the method according to the invention comprises a bandpass filtering of the estimated propagated noise signal, at the frequency of all or part of the detected periodic components, said filtering providing a signal, referred to as a reference signal, consisting essentially of the periodic components of the propagated noise signal.
- This reference signal is then used in the adjustment of the feedback noise signal, as described below.
- the method according to the invention comprises an adjustment of at least one coefficient of a second filter, finite impulse response, provided for adjusting the feedback signal against noise as a function of the reference signal filtered by a third filter finite impulse response modeling the inverse of the secondary path in amplitude.
- the filtered reference signal thus obtained, composed essentially of the periodic components of the estimated propagated noise signal, thus serves as a basis for adjusting the coefficients of the second filter, the function of which is precisely to eliminate the periodic components of the propagated noise signal.
- the filtering operation by the third filter modeling in amplitude the inverse of the secondary path, makes it possible to facilitate the adjustment of the coefficients of the second filter.
- the combination, on the one hand of the first filter modeling the secondary path and, on the other hand, of the third filter modeling in amplitude the inverse of the secondary path, results, in output, a flat response in amplitude, equal
- This facilitates the work of the second filter which consists in finding the optimal amplitudes and phases of the signal of counter-noise feedback that minimizes the energy of the error signal and therefore the energy of the propagated noise signal.
- ensuring this unit amplitude makes it possible to rid the second filter of the optimal amplitude search work and to focus only on the search for the optimal phase.
- At least one coefficient of the second filter can be adjusted by an algorithm of the Least Mean Square (LMS) minimization algorithm type as a function of the reference signal processed by the first filter, the signal of the second signal.
- LMS Least Mean Square
- error having undergone pass-band filtering at the frequency of all or part of the detected periodic components and of a convergence coefficient, called feedback, involved in the LMS algorithm.
- the counter-noise signal further comprises a feedback signal, called feedforward, adjusted according to the error signal and the noise signal measured by measuring means comprising for example a microphone.
- the feedforward counter-noise signal is intended to reduce the energy of non-periodic components of the noise signal.
- the method according to the invention makes it possible to implement, in a combined manner, a feedback noise signal and a feedforward counter-noise signal intended respectively to reduce the energy of the periodic components and the non-periodic components of the noise signal.
- the method according to the invention may furthermore comprise: amplitude modeling of the inverse of the secondary path by at least a fourth finite impulse response filter and
- the fourth filter may be identical to the third filter and the sixth filter identical to the first filter.
- the fourth filter may be the third filter and the sixth filter may be the first filter.
- the adjustment of the feedforward counter-noise signal comprises an adjustment of at least one coefficient of a fifth finite impulse response filter provided for adjusting said feedforward counter-noise signal in accordance with the noise signal previously processed by the fourth filter.
- At least one coefficient of the fifth filter is adjusted by a least squares algorithm according to the error signal, the noise signal measured and previously processed by the sixth filter modeling the path.
- the combination, on the one hand of the fourth filter modeling the secondary path and, on the other hand, of the sixth filter modeling in amplitude the inverse of the secondary path results, at the output, in a flat amplitude response, equal to 1.
- the method according to the invention can be implemented for the attenuation of at least one noise signal by transmitting a plurality of counter-noise signals by a plurality of transmission means.
- Each of the counter-noise signals may include:
- the method according to the invention makes it possible to on the one hand to increase the size of the determined zone in which it is desired to achieve a reduction of the energy of at least one propagated noise signal, and on the other hand to realize this reduction up to frequencies higher.
- the noise signal / error signal it is possible to process the noise over a greater distance and in a wider frequency band.
- the method according to the invention can be implemented to achieve an "acoustic comfort bubble". Since the spatial extent of such a bubble of free space acoustic comfort is rather confined as the frequency increases, it is necessary to consider several sources of emission of several counter-noise signals and several microphones of control of reduction of the noise. propagated noise signal energy. For example, knowing that the inter-ear space is about 20 centimeters, and that we take an identical margin to allow any freedom for a user to move the head reasonably, we end up with a bubble of acoustic comfort to achieve 40 centimeters in diameter, an effective treatment up to 200 Hz maximum by considering only one average pair of emission of the noise signal / error signal measuring means.
- an active reduction system at a given zone, of the energy of a sound signal, said propagated noise signal generated in the zone determined by a primary signal.
- said noise signal by emission of at least one counter-noise signal comprising at least a first counter-noise signal, said feedback, of an antagonistic effect to the noise signal propagated at the determined zone, the system comprising:
- At least one first filter for modeling a direct acoustic path referred to as the secondary path, between the means for transmitting the noise signal and the means for measuring the error signal possibly obtained after a previous step of identification ;
- the emission means of the counter-noise signal may comprise directional ultrasound transducers having a reduced emission beam.
- the counter noise contributes to reducing the noise signal in a targeted area or volume, it can quite easily increase them elsewhere. .
- reducing disturbances in a space does not mean reducing them in all space.
- means for transmitting a counter-noise signal such as loudspeakers are more directive at low frequencies than at high frequencies. Unless we can have speakers larger than the largest wavelength inherent in the spectrum of the noise signal to be treated, we can overcome this limitation, unless using ultrasonic transducers.
- the directivity of the ultrasound transducers presents a great advantage to design not a complex multi-channel system but a parallelization of multiple, much less complex, monovoic systems. . Indeed, in this case, the crossed paths and the rear contributions become negligible due to the directivity of the ultrasound transducers and the fact that the entities are not taken into account in the parallelized structure does not disturb the stability of the system.
- the system according to the invention may further comprise means for measuring the noise signal. These means may comprise at least one microphone, said noise, appropriately placed according to the noise source.
- the system according to the invention may further comprise means for estimating the noise signal propagated at the determined zone. The estimate of the propagated noise signal, as it arises at the determined zone, can be carried out as a function of the error signal and the counter-noise signal.
- the system according to the invention may comprise band-pass filtering means of the propagated noise signal estimated at the frequency of all or part of the periodic components of the propagated noise signal, and arranged to generate a reference signal, such as as described above.
- the means for adjusting the feedback noise signal may advantageously comprise at least a second finite impulse response filter provided for adjusting said feedback noise signal as a function of the reference signal filtered by a third impulse response filter. finite, arranged to model in amplitude the inverse of the secondary path.
- the counter-noise signal may comprise a second feedback signal, said feedforward, the system according to the invention further comprising means for transmitting the adjusted feedforward counter-noise signal as a function of the error signal and the noise signal.
- the system may include a fourth finite impulse response filter, amplitude modeling the inverse of the secondary path, a fifth filter, provided to adjust the feedforward counter-noise signal, based on the measured noise signal processed by the fourth filter. and a sixth filter, finite impulse response, arranged to model the secondary path.
- the system according to the invention may advantageously comprise a plurality of transmission means of a plurality of counter-noise signals implemented for the attenuation of at least one noise signal.
- FIG. 1 is a schematic representation of an active reduction configuration of a sound signal by means of a single-channel system according to the invention
- FIG. 2 is a schematic representation of an active reduction configuration of a sound signal thanks to a multi-channel system according to the invention
- FIG. 3 is a schematic representation in the form of functional blocks of the operations carried out at the level of a channel of a multi-channel system according to the invention comprising a measurement of the noise signal with measurement microphones;
- FIG. 4 is a schematic representation in the form of functional blocks of a module for detecting and filtering periodic components of a noise signal propagated at a channel of a multi-channel system according to the invention
- FIG. 5 is a schematic representation of a multi-channel electronic card implemented in the multichannel system according to the invention
- FIG. 6 is a representation of an emission beam of an ultrasound transducer used in the system according to the invention
- FIG. 7 is a first embodiment of the multiway system according to the invention for obtaining a comfort bubble; and FIG. 8 a second exemplary embodiment of the multi-way system according to the invention for obtaining a comfort bubble.
- FIG. 1 is a schematic representation of a configuration 10 active noise reduction through a single channel system 11 according to the invention.
- This system 11 comprises a noise microphone for measuring a noise signal x and a transducer emitting a noise signal adjusted therein to minimize the noise nuisance caused by the noise signal x at an acoustic comfort zone 12 wherein a control microphone is provided for measuring an error signal e.
- a control microphone is provided for measuring an error signal e.
- FIG. 1 shows a configuration 20 active noise reduction through a multiway system 21 according to the invention.
- This multi-channel system 21 comprises:
- the multi-channel system 21 comprises the same number of control microphones and transducers and a noise microphone.
- FIG. 3 is a block diagram representation of a channel k in the multipath configuration 20 implementing the multipath system 21 according to the invention for making the comfort bubble 22.
- n denotes the time discretized, that is to say the sampling time, by S kk the secondary path between the secondary source k and the control microphone k, that is to say, the direct acoustic path between the secondary source k , and the microphone k.
- the module 221 P k represents the primary path between the reference signal detection microphone x k (n) and the control microphone k.
- the control microphone k makes it possible to measure the error signal e k at the level of the comfort bubble. We will now describe the operation of the system 21 at a level k.
- the system 21 comprises two parts, namely a part 211, called feedforward and a part 212, called feedback.
- the feedback portion 212 comprises a finite impulse response filter W fbk k (z) for generating and adjusting a counter-noise feedback signal yfbk k (n).
- This feedback portion 212 also includes two FIR filters S kk (z) numerically modeling the secondary path S kk .
- This module 213 outputs an estimated propagated noise signal of k (n).
- a detection and filtering module 214 makes it possible to detect the periodic components of the propagated noise signal d k (n) from the analysis of the estimated propagated noise signal of k (n) and outputs a signal of reference of k (n) composed of the detected periodic components of the estimated propagated noise signal of k (n).
- This module 214 comprises an ANF detection unit 0 of the periodic frequencies in the estimated propagated noise signal of k (n) and an ALE band 9 filtering block (ALE for Adaptive An Enhancer) of the estimated propagated noise signal of k (n) the periodic component frequencies detected by the ANF 0 detection block.
- ALE Adaptive An Enhancer
- the reference signal of k (n) is then used by a FIR filter 1 / S kk (z) modeling in amplitude the inverse of the modeled secondary path S kk and then by a filter W fbk k (z) to adjust the signal counter-noise feedback yfbk k (n).
- the coefficients of the filter W fbk k (z) are adjusted by a minimization algorithm according to the least squares criterion, represented by the block LMS 1 as a function of the reference signal of k (n) previously treated by a filter S kk (z), and the bandpass filtered e-pass error signal e k (n) by an ALE block 9 at the periodic component frequencies detected in the estimated propagated noise signal of k (n).
- the feedforward portion 211 of the system 21 comprises a FIR filter W fwd k (z) for generating and adjusting a feedback signal feedback yfwd k (n) as a function of the noise signal x k (n) measured by means of measurement and previously filtered by an FIR filter 1 / S kk (z) modeling in amplitude the inverse of the modeled secondary path S kk .
- the coefficients of the filter W fwd k (z) are adjusted by an LMS algorithm, represented by the LMS block 1 as a function, on the one hand of the error signal e k (n), and on the other hand of the noise signal measured and previously treated by a filter S kk (z).
- the counter-noise signals feedforward yfwd k (n) and feedback yfbk k (n) are then added by an adder ⁇ to obtain a signal of counter-noise y k (n) which is transmitted to the comfort bubble by means of emission, which are in our example ultrasonic transducers.
- the error signal e k (n) for the channel k measured by a control microphone corresponds to the sum, on the one hand, of the propagated noise signal d k (n ), and secondly counter-noise signals corresponding to each of the channels of the system 21 and having traveled the secondary paths 5 ⁇ k (z) between the secondary sources associated with each of the channels and the control microphone k,
- e k (n) ⁇ S lk (z) y ((n) + d k (n).
- the error signal e k (n) for the channel k measured by a control microphone not shown corresponds this time to the sum, d part of the propagated noise signal d k (n), and secondly of the counter-noise signal y k (n) corresponding to the path k and having traveled the secondary path S kk (z), that is, ie the acoustic path between the transducer k and the control microphone k.
- e k (n) y k (n) 5 kk (n) + d k (n).
- FIG. 4 is a block diagram representation of module 214 for detecting and filtering periodic components of the estimated propagated noise signal of k (n).
- the frequency estimation method used in the present example involves an infinite impulse response bandpass filtering of constant amplitude everywhere else than the frequencies of the components of the noise signal, where the bandwidth is almost zero.
- These filters are called "notch" filters and are referred to as ANF (Adaptive Notch Filter).
- ANF Adaptive Notch Filter
- H t (z, Q) -N t (z, Q) / D t (z, Q)
- the lattice formulation is in the following form:
- a cascade decomposition, represented in FIG. 4, of this module 214 is chosen in order to determine the frequencies composing a given signal. Also, for p periodic components, we have p filters H 1 (Z) in series. It should be noted that the cascade decomposition of block 214 is indicated by a C, for cascade, in ANF C (see FIG. 3).
- ⁇ (n) ⁇ (n - 1) + T "1 (n) ⁇ (n) E (n).
- the reference signal of k (n) and the error signal e k (n) are filtered by bandpass filters centered around the frequencies present in the noise signal. estimated propagation of k (n).
- the complement of a notch filter, in whatever formulation is it, is a band-pass filter, denoted N hLE (z '1 ) r in which the central frequency of filtering intervenes.
- the detection and filtering module 112 is composed of as many sections 2141 in cascade as of periodic components to be detected. Each section / is in the form of a filter H 1 (Z '1 ) comprising:
- This set 2142 is designed to perform the detection of a periodic component a, of the estimated propagated noise signal of k (n);
- a filter 2143 denoted by N ⁇ (Z '1 ), and designed to filter the estimated propagated noise signal of k (n) at the frequency of the periodic component a, detected by the set 2142.
- This filter 2143 provides in output a signal of kl (n) composed only of the periodic component a, of the estimated propagated noise signal of k (n).
- the reference signal of k (n) is obtained by adding all the signals of kl (n) provided by the filters N ⁇ (Z '1 ) of sections 2141. Note that this addition operation is signaled by a P, as parallel, in ALE P (see Figure 3)
- the operations of analyzing the noise signal, generating and adjusting the counter-noise signals y k (n) for all the channels k of the multi-channel noise reduction system 21 according to the invention can be integrated on a only electronic card.
- FIG. 5 schematically represents an example of an electronic card 30 for a multichannel sound reduction system having 6 channels 300-305 at the input, and 4 channels 306-309 at the output. In entry of this card 30:
- the channels 300-303 corresponding to four error signals, respectively e 1 (n) -e 4 (n), measured by four control microphones, 310-313 respectively, arranged in the comfort bubble 22;
- the channel 304 corresponds to the noise signal x (n) measured by a noise microphone; and the channel 305 corresponds to a signal coming from a potentiometer 315 making it possible to adjust the feedback and feedforward convergence coefficients intervening in the LMS algorithms used.
- the channels 306-309 correspond to four counter-noise signals, respectively yi (n) -y 4 (n), intended to be emitted by four transducers, respectively 316-319, suitably arranged.
- the card For each of the channels 300-304, the card comprises:
- a pre-amplification stage 320 pre-amplifying the signals of each of the channels 300 - 304, using pre-amplifiers 3200-3204;
- a gain stage 330 disposed at the output of the stage 320, and applying a gain to the signals of each of the channels 300 - 304 using amplifiers 3300-3304 of adjustable gain; an anti-alias filtering stage 340 at the output of the gain stage 330, and performing an anti-aliasing filtering of the signals of each of the channels 300-304, using anti-aliasing filters; 3400-3404.
- the sampling frequency at the 3400-3404 filters is adjustable using a 3405 module; - At the output of the stage 340, a multiplexer 31 performing a multiplexing of the signals of the channels 300 - 304; and at the output of the multiplexer 31, an analog-digital converter 32, performing an analog-to-digital conversion of the multiplexed signal.
- the multiplexed digital signal obtained at the output of the converter 32, then enters a processor 33 of the DSP type which makes it possible to carry out for each channel the operations that we have described above and diagrammatically represented in FIGS. 3 and 4.
- the processor 33 used in the present example is an Analog Devices processor of the SHARC range in industrial finish so resistant to extreme temperatures.
- the implementation of the code is provided via the interface developed by Analog Devices is the software VisualDSP ++, which has a high-level C compiler. It is possible to work either in floating point or in fixed comma.
- the sampling frequency at the level of the processor is configurable, using a module 331, to respond to all cases of active reduction of the energy of a sound signal.
- the DSP 33 has been sized to accommodate operations inherent to the LMS algorithms used.
- the DSP can accommodate more complex algorithms than those used because an external memory 34 is present on the card 30, in order to meet any additional costs in memory and calculation.
- connection lines 35 In the case of a multi-card system, a link can be made between the different cards using the connection lines 35. This possibility has been designed to be able to extend to infinity active nuisance reduction applications. sound and not to have limitations due to the processor 33.
- the digital signal is composed of the counter-noise signals This digital signal is converted using a digital-to-analog converter 36. Then the analog signal obtained enters a demultiplexer 37 and demultiplexed. After the demultiplexing the different counter-noise signals are separated and located on exit routes 306-309. Before being emitted by the transducers 316-319, the counter-noise signals undergo:
- a smoothing by a smoothing stage 350 comprising low-pass filters 3500-3503.
- the sampling frequency at the 3500-3503 filters is adjustable using the 3405 module;
- a gain stage 360 comprising amplifiers 3600-3603 of adjustable gain
- a power amplification by a power amplification stage 370 comprising power amplifiers.
- This power amplification stage 370 may not be on the card 30 as shown in FIG.
- the adjustment signal of the feedback and feedforward convergence coefficients from the potentiometer 315 on the channel 305 is amplified by an amplifier 3051 and then an analog-to-digital conversion by means of a digital analog converter 3052 before entering the processor 33.
- convergence coefficient is a weighting factor, strictly positive and less than 1, applied at the level of the reactualization in the LMS algorithm of the coefficients of the various filters mentioned above.
- Transducers 316-319 used in the present example are ultrasound transducers. These ultrasound transducers 316-319 have a transmission beam 61, shown in FIG. 6, which is very small. In addition, ultrasound, completely inaudible to the emission, distort as they spread in the air and slide into the audible spectrum and the volume in which they become audible is quite predictable.
- FIG. 7 schematically represents a first exemplary embodiment of the multichannel system according to the invention for obtaining a comfort bubble 22 by means of 4 ultrasound transducers 316-319 properly placed on a desk table 71.
- the positioning of these transducers is obviously not limited to the office alone. They can quite be arranged around an opening, a window or a door for example.
- the comfort bubble 22 obtained is located substantially at a level corresponding to the level of the head of a user on the desk table 71.
- Figure 8 Another embodiment of the system according to the invention is shown schematically in Figure 8. This is a booth 80 to accommodate one or more users 81 to provide a noise reduction zone around their head. It is designed to be implemented both in public spaces and in factories, and can also be a medium for advertising.
- the principle is as follows: a multitude of noise microphones 82 implanted at the level of the structure of the isolator 81 provide the noise signals, bases for the algorithm described above for calculating the counter-noise signals propagated by a multitude of secondary sources 83 located in the polling booth 80.
- Display panels 85 allow the display of information such as advertising.
- the isolator 80 includes one or more seats or buttocks 86 allowing the user 81 to land.
- the invention is not limited to the examples of applications that we have just described and can be applied to the reduction of the energy of any sound signal in a given zone.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Physical Water Treatments (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0701718A FR2913521B1 (fr) | 2007-03-09 | 2007-03-09 | Procede de reduction active d'une nuisance sonore. |
PCT/FR2008/050371 WO2008125774A2 (fr) | 2007-03-09 | 2008-03-04 | Procede de reduction active d'une nuisance sonore |
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EP2122607A2 true EP2122607A2 (fr) | 2009-11-25 |
EP2122607B1 EP2122607B1 (fr) | 2011-01-12 |
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EP08775674A Active EP2122607B1 (fr) | 2007-03-09 | 2008-03-04 | Procede de reduction active d'une nuisance sonore |
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EP (1) | EP2122607B1 (fr) |
AT (1) | ATE495521T1 (fr) |
DE (1) | DE602008004461D1 (fr) |
ES (1) | ES2359783T3 (fr) |
FR (1) | FR2913521B1 (fr) |
WO (1) | WO2008125774A2 (fr) |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
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US9165549B2 (en) * | 2009-05-11 | 2015-10-20 | Koninklijke Philips N.V. | Audio noise cancelling |
EP2647002B1 (fr) | 2010-12-03 | 2024-01-31 | Cirrus Logic, Inc. | Contrôle de supervision d'un annuleur de bruit adaptatif dans un dispositif audio personnel |
US8908877B2 (en) | 2010-12-03 | 2014-12-09 | Cirrus Logic, Inc. | Ear-coupling detection and adjustment of adaptive response in noise-canceling in personal audio devices |
EP2863389B1 (fr) | 2011-02-16 | 2019-04-17 | Dolby Laboratories Licensing Corporation | Décodeur à filtres configurables |
US8737634B2 (en) | 2011-03-18 | 2014-05-27 | The United States Of America As Represented By The Secretary Of The Navy | Wide area noise cancellation system and method |
US9824677B2 (en) | 2011-06-03 | 2017-11-21 | Cirrus Logic, Inc. | Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC) |
US8958571B2 (en) | 2011-06-03 | 2015-02-17 | Cirrus Logic, Inc. | MIC covering detection in personal audio devices |
US9318094B2 (en) | 2011-06-03 | 2016-04-19 | Cirrus Logic, Inc. | Adaptive noise canceling architecture for a personal audio device |
US9462370B2 (en) | 2012-02-08 | 2016-10-04 | Kyushu Institute Of Technology | Muting device |
US9123321B2 (en) | 2012-05-10 | 2015-09-01 | Cirrus Logic, Inc. | Sequenced adaptation of anti-noise generator response and secondary path response in an adaptive noise canceling system |
US9318090B2 (en) | 2012-05-10 | 2016-04-19 | Cirrus Logic, Inc. | Downlink tone detection and adaptation of a secondary path response model in an adaptive noise canceling system |
US9532139B1 (en) | 2012-09-14 | 2016-12-27 | Cirrus Logic, Inc. | Dual-microphone frequency amplitude response self-calibration |
US9414150B2 (en) | 2013-03-14 | 2016-08-09 | Cirrus Logic, Inc. | Low-latency multi-driver adaptive noise canceling (ANC) system for a personal audio device |
US9620101B1 (en) | 2013-10-08 | 2017-04-11 | Cirrus Logic, Inc. | Systems and methods for maintaining playback fidelity in an audio system with adaptive noise cancellation |
US10219071B2 (en) | 2013-12-10 | 2019-02-26 | Cirrus Logic, Inc. | Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation |
US9478212B1 (en) | 2014-09-03 | 2016-10-25 | Cirrus Logic, Inc. | Systems and methods for use of adaptive secondary path estimate to control equalization in an audio device |
US9559803B2 (en) * | 2015-04-03 | 2017-01-31 | National Security Technologies, Llc | Electromagnetic spectrum management system |
WO2017029550A1 (fr) * | 2015-08-20 | 2017-02-23 | Cirrus Logic International Semiconductor Ltd | Contrôleur d'élimination de bruit adaptatif de rétroaction (anc) et procédé ayant une réponse de rétroaction partiellement fournie par un filtre à réponse fixe |
EP3338279A1 (fr) * | 2015-08-20 | 2018-06-27 | Cirrus Logic International Semiconductor Ltd. | Contrôleur d'élimination de bruit adaptatif de rétroaction (anc) et procédé ayant une réponse de rétroaction partiellement fournie par un filtre à réponse fixe |
US10013966B2 (en) | 2016-03-15 | 2018-07-03 | Cirrus Logic, Inc. | Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device |
US10515620B2 (en) * | 2017-09-19 | 2019-12-24 | Ford Global Technologies, Llc | Ultrasonic noise cancellation in vehicular passenger compartment |
SE1850077A1 (en) * | 2018-01-24 | 2019-07-25 | Creo Dynamics Ab | Active noise control method and system using variable actuator and sensor participation |
US10951974B2 (en) | 2019-02-14 | 2021-03-16 | David Clark Company Incorporated | Apparatus and method for automatic shutoff of aviation headsets |
JP7241119B2 (ja) * | 2021-03-18 | 2023-03-16 | 本田技研工業株式会社 | 能動型騒音制御装置 |
CN113409755B (zh) * | 2021-07-26 | 2023-10-31 | 北京安声浩朗科技有限公司 | 主动降噪方法、装置及主动降噪耳机 |
CN116439913B (zh) * | 2023-04-14 | 2024-03-15 | 中国人民解放军海军潜艇学院 | 一种船用主动听力防护型耳罩及其防护方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US5940519A (en) * | 1996-12-17 | 1999-08-17 | Texas Instruments Incorporated | Active noise control system and method for on-line feedback path modeling and on-line secondary path modeling |
US5978489A (en) * | 1997-05-05 | 1999-11-02 | Oregon Graduate Institute Of Science And Technology | Multi-actuator system for active sound and vibration cancellation |
SG106582A1 (en) * | 2000-07-05 | 2004-10-29 | Univ Nanyang | Active noise control system with on-line secondary path modeling |
WO2003015074A1 (fr) * | 2001-08-08 | 2003-02-20 | Nanyang Technological University,Centre For Signal Processing. | Systeme d'annulation active du bruit avec modelisation de trajet secondaire en ligne |
GB0208421D0 (en) * | 2002-04-12 | 2002-05-22 | Wright Selwyn E | Active noise control system for reducing rapidly changing noise in unrestricted space |
US7835529B2 (en) * | 2003-03-19 | 2010-11-16 | Irobot Corporation | Sound canceling systems and methods |
-
2007
- 2007-03-09 FR FR0701718A patent/FR2913521B1/fr not_active Expired - Fee Related
-
2008
- 2008-03-04 US US12/530,506 patent/US8401204B2/en not_active Expired - Fee Related
- 2008-03-04 EP EP08775674A patent/EP2122607B1/fr active Active
- 2008-03-04 ES ES08775674T patent/ES2359783T3/es active Active
- 2008-03-04 DE DE602008004461T patent/DE602008004461D1/de active Active
- 2008-03-04 WO PCT/FR2008/050371 patent/WO2008125774A2/fr active Application Filing
- 2008-03-04 AT AT08775674T patent/ATE495521T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2008125774A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008125774A4 (fr) | 2009-02-19 |
ATE495521T1 (de) | 2011-01-15 |
FR2913521A1 (fr) | 2008-09-12 |
US8401204B2 (en) | 2013-03-19 |
US20100034398A1 (en) | 2010-02-11 |
ES2359783T3 (es) | 2011-05-26 |
DE602008004461D1 (fr) | 2011-02-24 |
EP2122607B1 (fr) | 2011-01-12 |
FR2913521B1 (fr) | 2009-06-12 |
WO2008125774A3 (fr) | 2008-12-31 |
WO2008125774A2 (fr) | 2008-10-23 |
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