EP2777299B1 - Method of reducing parasitic vibrations in an environment of a loudspeaker and apparatus suitable therefor. - Google Patents

Method of reducing parasitic vibrations in an environment of a loudspeaker and apparatus suitable therefor. Download PDF

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Publication number
EP2777299B1
EP2777299B1 EP12783212.9A EP12783212A EP2777299B1 EP 2777299 B1 EP2777299 B1 EP 2777299B1 EP 12783212 A EP12783212 A EP 12783212A EP 2777299 B1 EP2777299 B1 EP 2777299B1
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Prior art keywords
signal
loudspeaker
frequency band
harmonic
frequency
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German (de)
French (fr)
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EP2777299A1 (en
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Frédéric AMADU
Thomas Esnault
Alexandre SENIERES
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Arkamys SA
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Arkamys SA
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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
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

Definitions

  • the document WO 00/57673 describes that low frequency audio signals can interfere with neighbors of the listener, and in order to alleviate this problem there are band elimination filters, but eliminating audio signals in the frequency band decreases the quality of perception for the listener.
  • the document proposes to solve this problem by means of a combination of a elimination filter and a harmonic generator.
  • the invention relates to a method for reducing “rattle noise” making it possible to preserve the perception of the low frequencies of the signal to be broadcast, as well as the associated processing device.
  • the invention finds a particularly advantageous application in the field of sound broadcasting devices, such as digital televisions, car radios, or MP3-type players.
  • a loudspeaker When a loudspeaker operates in a certain frequency band lower than its cutoff frequency, objects located in the environment in which it is integrated, are likely to vibrate, which generates unpleasant sounds to the ear (the aforementioned rattle noise).
  • This frequency band is called in this document “vibratory frequency band”. It is also noted that the cutoff frequency of a loudspeaker depends on the intrinsic characteristics of the loudspeaker.
  • a known method for avoiding this vibration phenomenon is to eliminate, in the signal to be diffused, the vibratory frequency band generating the unwanted vibrations.
  • the downside of such a method is that it removes low frequency content from the original work, which changes its perception by the listener.
  • the object of the invention is to remedy this drawback by proposing a method reducing or eliminating the parasitic vibrations of an object in the environment of a loudspeaker while making it possible to preserve the perception of the low frequencies of the original sound signal.
  • harmonics originating from the low frequency part of the original signal are generated and introduced into the part of the sound signal which can be reproduced by the loudspeaker. In this way, the listener will perceive, by sound reconstruction made by the brain, the sound of the suppressed low frequency part.
  • the invention therefore relates to a method of reducing parasitic vibrations in the environment of a loudspeaker while making it possible to preserve the perception of the bass of an electrical sound signal, according to claim 1.
  • the method comprises the step of frequency shifting lines of the frequency spectrum of the harmonic signal, so that certain harmonics located below the cut-off frequency of the loudspeaker are shifted beyond said loudspeaker cutoff frequency for diffusion through the loudspeaker.
  • the method comprises the step of compressing the dynamics of the low frequency part of the recombined signal after having removed the vibratory frequency band thereof, so as to increase the perceived power of the spectral lines of the recombined signal located around the vibratory frequency band.
  • the method comprises the step of generating several harmonic signals and of combining the harmonic signals to obtain a signal called the global harmonics signal, this global harmonics signal being combined with the sound signal. original to get the recombined signal.
  • the method comprises the step of generating at least one harmonics signal from a harmonics signal previously generated from the low frequency band of the original sound signal.
  • the method comprises a step of eliminating or temporally correcting the negative part of the signal of the low frequency band and a step of eliminating the DC component thus created.
  • the invention further relates to a device for processing a sound signal, characterized in that it comprises means suitable for implementing the method according to the invention.
  • the Figure 1 shows a device 1 carrying out processing on an electrical signal of its so-called original sound signal S1.
  • the device 1 makes it possible to reduce the phenomenon of vibration of an environment of a loudspeaker while making it possible to preserve the perception of the low frequencies of the signal S1.
  • This signal S1 can for example be a right or left sound signal of a stereophonic signal. Similar processing is performed on the other signal of the stereophonic signal.
  • the device 1 can be integrated in particular into a digital television, a car radio, or an MP3-type player.
  • the device 1 comprises a set A of functional blocks ensuring the generation and introduction of harmonics inside the original signal S1 from a low-frequency part of said original signal S1 as well as a set B blocks ensuring the extraction of the low frequency band of the original sound signal generating vibrations of the environment of the loudspeaker, called "vibratory frequency band".
  • This vibratory frequency band is identified by the operator by applying a variable frequency signal to the loudspeaker and by identifying the frequency band for which he perceives “by ear” vibrations of the loudspeaker environment. This vibratory band is located below the cut-off frequency fc of the loudspeaker.
  • the set A comprises a low-pass filter FLP1 applied to the original signal S1 so as to obtain an original low-frequency sound signal S2.
  • the cut-off frequency of the filter FLP1 is close to the cut-off frequency fc of the loudspeaker HP which is of the order of 100 Hz.
  • the signal S2 is then applied to the input of a module H1 making it possible to generate a harmonic signal S3 at the output.
  • the harmonics contained in the signal S3 are multiples of the frequencies of the low frequency sound signal S2. In one example, only the 1st and 2nd order harmonics are kept.
  • the H1 module removes the negative part of the time signal S3 (H1 module called “Half Wave rectify” in English) or corrects the negative part.
  • time signal S2 H1 module called “Full Wave rectifier”. Through “Straightening” is understood to mean multiplying by -1 the negative gain values of the low-frequency sound signal S2 in temporal form. Then the DC component thus created is removed using a high pass filter whose cut-off frequency is very low (of the order of 20 Hz).
  • the signal S3 is applied at the input of a module D1 ensuring a frequency shift of the lines of the frequency spectrum of the harmonics signal S3, so that certain harmonics located below the cut-off frequency fc of the loudspeaker HP are shifted to the beyond said cut-off frequency fc of the loudspeaker.
  • the frequency of each of the spectral lines of the signal S3 is multiplied by integer N, N preferably equal to 2. It is thus guaranteed that the majority of the harmonics generated will be located in the optimum operating band of the loudspeaker HP.
  • the signal S3 will preferably have been equalized using the module E1. It will be recalled that in sound processing, equalization consists in attenuating or accentuating one or more frequency bands making up the sound signal.
  • the harmonic signal thus shifted, referenced S4 in the figures, is then filtered by means of a low-pass filter FLP'1 so as to obtain a signal S5 called a reduced harmonics signal.
  • the FLP'1 filter thus makes it possible to eliminate the harmonics in the high frequency part of the signal S4 which are unnecessary for the reproduction of the bass signal.
  • the cut-off frequency of the low-pass filter FLP'1 is greater than the cut-off frequency fc of the loudspeaker HP.
  • the cut-off frequency of FLP'1 is between 2 * fc and 4 * fc or is exactly equal to one of these limit values.
  • the original signal S1 is applied, with the signal S5 preferably equalized by the module E3 at the input of a combination device C1.
  • the combination of the signals consists of an addition, samples by samples, of the signals applied to the input of the device C1.
  • the applied delay T corresponds to the processing time of the signal S1 by the modules FLP1, H1, E1, D1 and FLP'1. This delay T is for example of the order of 10 samples.
  • a signal S6 called a recombined signal, is obtained, then processed by the assembly B ensuring in particular the elimination of the vibratory frequency band of the sound signal to be broadcast.
  • the set B comprises a high-pass filter FHPa and a low-pass filter FLPa applied to the signal S6 so as to obtain respectively a high-frequency recombined signal S7 and a low-frequency recombined signal S8.
  • the cut-off frequencies of the filters FLPa and FHPa are preferably identical. These cut-off frequencies are chosen to be close to the cut-off frequency fc of the loudspeaker HP.
  • a rejector filter Frej is applied to the low-frequency recombined signal S8 so as to remove the vibratory frequency band of the signal S8.
  • This Frej filter whose profile in broken lines is shown on the Figure 3 has the following characteristics: a central frequency f0, an attenuation gain H and a quality coefficient Q corresponding substantially to the width of the cut band. These values are of course adapted as a function of the amplitude of the vibratory frequency band as well as the width of this vibratory frequency band.
  • f0 60Hz
  • H -12dB
  • Q 5 for a vibratory frequency band of the order of 58 to 63Hz.
  • the rejector filter Frej is replaced by a high-pass filter.
  • the signal S9 obtained at the output of the rejector filter Frej is applied at the input of a module L1 capable of compressing the signal S9.
  • the compression of the signal S9 consists in reducing the dynamics of the low frequency signal, containing the generated harmonics, so as to increase the perceived power.
  • the harmonics located around the vibratory frequency band are increased.
  • the dynamic range of the low frequency signal is compressed by 12dB.
  • the compressed signal S10 obtained at the output of the module L1 and the high-frequency recombined signal S7 are applied at the input of a combination module C2, such as an adder.
  • the signal S10 Prior to its application to the input of the module C2, the signal S10 is preferably equalized using a module E4.
  • the combination of signals produced by the module C2 consists, as for module C1, of an addition, samples by samples, of the signals applied to the input of device C2.
  • the sound signal S11 obtained at the output of the module C2 is a sound signal applied to the input of the loudspeaker HP for its distribution.
  • the harmonics obtained from the low frequency part of the signal S1 and introduced into the sound signal will allow the listener to perceive the low frequency sounds of the original signal despite the removal of part of these sounds (the band frequency vibration) while avoiding the vibration of the environment of the loudspeaker.
  • the frequency shift module D1 can be positioned upstream of the harmonic generation module, as shown by the dotted arrow.
  • the Figure 2 shows an embodiment of the processing device according to which several types of harmonics are generated.
  • H1-HN modules associated with FLP1-FLPN low-pass filters are connected in parallel or in series with each other.
  • the signals from the low-pass filters FLP1-FLP4 are respectively referenced S2, S2 ', S2 ", S2 ′′′.
  • the harmonic signals obtained at the output of the H1-H4 modules are respectively referenced S3, S3', S3", S3 ′′′ ...
  • the S3 ′′′ harmonics signal of the H4 module connected downstream is obtained from the S3 ⁇ harmonics signal generated by the H3 module connected upstream.
  • the H1-HN modules preferably implement different harmonic generation methods or at least present, for the same method, adjustment parameters. different from each other.
  • the signals S3, S3 ′, S3 ⁇ , S3 ′′′ coming from the H1-H4 harmonic generation systems are applied to the input of a device C3 for combining the signals such as an adder performing operations of addition identical to those of the summers C1 and C2.
  • the signals S3, S3 ′, S3 ⁇ , S3 ′′′ obtained at the output of the H1-HN harmonic generation systems are equalized using modules E1, E5, E6, E7 prior to their application at the input of the device.
  • Combination C3 At the output of the device C3, a signal S3g called the global harmonic signal is obtained.

Description

DOMAINE TECHNIQUE DE L'INVENTIONTECHNICAL FIELD OF THE INVENTION

Dans le domaine de l'acoustique des véhicules, les vibrations parasites audibles et indésirables des structures (panneaux de portes, feuilles d'étanchéités, tableau de bord) et des divers objets (câbles, visserie) couplés avec les haut-parleurs de façon mécanique et/ou acoustique sont appelées « rattling noise » ou « rattle noise », ce qu'on peut traduire par « bruit de grelot » ou « bruit de coup ». Les éléments couplés de manière mécanique et/ou acoustique appartiennent à ce qu'on appelle l'environnement du haut-parleur dans la suite du document.In the field of vehicle acoustics, audible and unwanted parasitic vibrations of structures (door panels, sealing sheets, dashboard) and various objects (cables, screws) mechanically coupled with the speakers and / or acoustics are called “rattling noise” or “rattle noise”, which can be translated as “bell noise” or “knock noise”. The mechanically and / or acoustically coupled elements belong to what is called the loudspeaker environment in the remainder of the document.

Ce phénomène apparaît principalement quand les haut-parleurs émettent des basses fréquences audibles. Le bruit ressemble à des coups donnés dans les structures, ou à des vibrations de petits objets prisonniers des structures. Habituellement, pour réduire ce bruit, on peut :

  • découpler mécaniquement les structures et les haut-parleurs, en intercalant des « silent blocs », des pièces de mousses ou des entretoises,
  • découpler mécaniquement les structures entre elles, en insérant des blocs de mousse ou en réduisant les liens mécaniques aux jonctions,
  • changer les propriétés mécaniques des structures, raideur masse et frottement, pour déplacer les fréquences de résonnance de certains modes
  • retirer les objets qui sont mis en vibration par le champ sonore du haut-parleur, et qui peuvent se trouver en contact avec des surfaces et faire du bruit.
This phenomenon occurs mainly when the speakers emit audible low frequencies. The noise resembles knocks given in structures, or vibrations of small objects trapped in structures. Usually, to reduce this noise, you can:
  • mechanically decouple the structures and the loudspeakers, by inserting "silent blocks", pieces of foam or spacers,
  • mechanically decouple the structures from one another, by inserting foam blocks or reducing the mechanical links at the junctions,
  • change the mechanical properties of structures, stiffness mass and friction, to shift the resonance frequencies of certain modes
  • remove objects which are set in vibration by the sound field of the speaker, and which may come in contact with surfaces and make noise.

Le document US 2002 015255 décrit un procédé dit de « compensation des basses » applicable à un haut-parleur dont les dimensions sont trop faibles pour reproduire les basses fréquences. Ce procédé vise à produire un son riche en basse sans distorsion dudit son par le haut-parleur lui-même.The document US 2002 015255 describes a so-called “bass compensation” method applicable to a loudspeaker whose dimensions are too small to reproduce low frequencies. This method aims to produce a rich bass sound without distortion of said sound by the speaker itself.

Le document WO 00/57673 décrit que des signaux audio de basse fréquence peuvent gêner des voisins de l'auditeur, et, afin de palier à ce problème, il existe des filtres à élimination de bande, mais l'élimination des signaux audio dans la bande de fréquence diminue la qualité de la perception pour l'auditeur. Le document propose de résoudre ce problème au moyen d'une combinaison d'un filtre à élimination et un générateur d'harmoniques.The document WO 00/57673 describes that low frequency audio signals can interfere with neighbors of the listener, and in order to alleviate this problem there are band elimination filters, but eliminating audio signals in the frequency band decreases the quality of perception for the listener. The document proposes to solve this problem by means of a combination of a elimination filter and a harmonic generator.

L'invention concerne un procédé de réduction du « rattle noise » permettant de conserver la perception des basses fréquences du signal à diffuser ainsi que le dispositif de traitement associé.The invention relates to a method for reducing “rattle noise” making it possible to preserve the perception of the low frequencies of the signal to be broadcast, as well as the associated processing device.

L'invention trouve une application particulièrement avantageuse dans le domaine des appareils de diffusion sonore, tels que les télévisions numériques, les autoradios, ou les lecteurs de type MP3.The invention finds a particularly advantageous application in the field of sound broadcasting devices, such as digital televisions, car radios, or MP3-type players.

ETAT DE LA TECHNIQUESTATE OF THE ART

Lorsqu'un haut-parleur fonctionne dans une certaine bande de fréquences inférieure à sa fréquence de coupure, des objets situés dans l'environnement auquel il est intégré, sont susceptibles d'entrer en vibration, ce qui génère des sons désagréables à l'oreille (le « rattle noise » précité). Cette bande de fréquence est appelée dans ce document « bande fréquentielle vibratoire ». On note également que la fréquence de coupure d'un haut-parleur dépend des caractéristiques intrinsèques du haut-parleur.When a loudspeaker operates in a certain frequency band lower than its cutoff frequency, objects located in the environment in which it is integrated, are likely to vibrate, which generates unpleasant sounds to the ear (the aforementioned rattle noise). This frequency band is called in this document “vibratory frequency band”. It is also noted that the cutoff frequency of a loudspeaker depends on the intrinsic characteristics of the loudspeaker.

Une méthode connue pour éviter ce phénomène de vibrations est de supprimer, dans le signal à diffuser, la bande fréquentielle vibratoire engendrant les vibrations non désirées. Toutefois, l'inconvénient d'une telle méthode est qu'elle supprime du contenu basse fréquence de l'œuvre originale, ce qui en modifie sa perception par l'auditeur.A known method for avoiding this vibration phenomenon is to eliminate, in the signal to be diffused, the vibratory frequency band generating the unwanted vibrations. However, the downside of such a method is that it removes low frequency content from the original work, which changes its perception by the listener.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention a pour but de remédier à cet inconvénient en proposant un procédé réduisant ou supprimant les vibrations parasites d'un objet dans l'environnement d'un haut-parleur tout en permettant de conserver la perception des basses fréquences du signal sonore original.The object of the invention is to remedy this drawback by proposing a method reducing or eliminating the parasitic vibrations of an object in the environment of a loudspeaker while making it possible to preserve the perception of the low frequencies of the original sound signal.

A cet effet, préalablement à la suppression de la bande fréquentielle vibratoire, des harmoniques issues de la partie basse fréquence du signal original sont générées et introduites dans la partie du signal sonore restituable par le haut-parleur. De cette manière, l'auditeur percevra, par reconstruction sonore faite par le cerveau, le son de la partie basse fréquence supprimée.To this end, prior to the elimination of the vibratory frequency band, harmonics originating from the low frequency part of the original signal are generated and introduced into the part of the sound signal which can be reproduced by the loudspeaker. In this way, the listener will perceive, by sound reconstruction made by the brain, the sound of the suppressed low frequency part.

L'invention concerne donc un procédé de réduction de vibrations parasites dans l'environnement d'un haut-parleur tout en permettant de conserver la perception des basses d'un signal électrique de son, selon la revendication 1.The invention therefore relates to a method of reducing parasitic vibrations in the environment of a loudspeaker while making it possible to preserve the perception of the bass of an electrical sound signal, according to claim 1.

Selon une mise en oeuvre, le procédé comporte l'étape de décaler fréquentiellement des raies du spectre fréquentiel du signal d'harmoniques, de sorte que certaines harmoniques situées en dessous de la fréquence de coupure du haut-parleur sont décalées au-delà de ladite fréquence de coupure du haut-parleur pour une diffusion par le haut-parleur.According to one implementation, the method comprises the step of frequency shifting lines of the frequency spectrum of the harmonic signal, so that certain harmonics located below the cut-off frequency of the loudspeaker are shifted beyond said loudspeaker cutoff frequency for diffusion through the loudspeaker.

Selon une mise en œuvre, le procédé comporte l'étape de compresser la dynamique de la partie basse fréquence du signal recombiné après en avoir supprimé la bande fréquentielle vibratoire, de manière à augmenter la puissance perçue des raies spectrales du signal recombiné situées autour de la bande fréquentielle vibratoire.According to one implementation, the method comprises the step of compressing the dynamics of the low frequency part of the recombined signal after having removed the vibratory frequency band thereof, so as to increase the perceived power of the spectral lines of the recombined signal located around the vibratory frequency band.

Selon une mise en œuvre, le procédé comporte l'étape de générer plusieurs signaux d'harmoniques et de combiner les signaux d'harmoniques pour obtenir un signal dit signal global d'harmoniques, ce signal d'harmoniques global étant combiné avec le signal sonore original pour obtenir le signal recombiné.According to one implementation, the method comprises the step of generating several harmonic signals and of combining the harmonic signals to obtain a signal called the global harmonics signal, this global harmonics signal being combined with the sound signal. original to get the recombined signal.

Facultativement, dans cette dernière mise en œuvre, le procédé comporte l'étape de générer au moins un signal d'harmoniques à partir d'un signal d'harmoniques préalablement généré à partir de la bande basses fréquences du signal sonore original.Optionally, in this latter implementation, the method comprises the step of generating at least one harmonics signal from a harmonics signal previously generated from the low frequency band of the original sound signal.

Selon une mise en œuvre, pour générer les harmoniques contenues dans le signal d'harmoniques, le procédé comporte une étape de supprimer ou de redresser temporellement la partie négative du signal de la bande basses fréquences et une étape de suppression de la composante continue ainsi créée.According to one implementation, to generate the harmonics contained in the harmonic signal, the method comprises a step of eliminating or temporally correcting the negative part of the signal of the low frequency band and a step of eliminating the DC component thus created. .

L'invention concerne en outre un dispositif de traitement d'un signal sonore caractérisé en ce qu'il comporte des moyens adaptés pour la mise en œuvre du procédé selon l'invention.The invention further relates to a device for processing a sound signal, characterized in that it comprises means suitable for implementing the method according to the invention.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent. Ces figures ne sont données qu'à titre illustratif mais nullement limitatif de l'invention. Elles montrent :

  • Figure 1 : une représentation schématique des blocs fréquentiels du dispositif de traitement selon l'invention ;
  • Figure 2 : une représentation schématique des blocs fréquentiels d'une variante de réalisation du dispositif de traitement selon l'invention suivant laquelle sont générés plusieurs types d'harmoniques ;
  • Figure 3 : une représentation schématique du profil du filtre réjecteur utilisé pour extraire la bande fréquentielle vibratoire du signal sonore à diffuser par le haut-parleur.
The invention will be better understood on reading the description which follows and on examining the accompanying figures. These figures are given only by way of illustration but in no way limit the invention. They show :
  • Figure 1 : a schematic representation of the frequency blocks of the processing device according to the invention;
  • Figure 2 : a schematic representation of the frequency blocks of an alternative embodiment of the processing device according to the invention according to which several types of harmonics are generated;
  • Figure 3 : a schematic representation of the profile of the rejector filter used to extract the vibratory frequency band of the sound signal to be broadcast by the loudspeaker.

Les éléments identiques, similaires ou analogues conservent la même référence d'une figure à l'autre.Identical, similar or analogous elements keep the same reference from one figure to another.

DESCRIPTION D'UN EXEMPLE DE REALISATION DE L'INVENTIONDESCRIPTION OF AN EXAMPLE OF EMBODIMENT OF THE INVENTION

La Figure 1 montre un dispositif 1 réalisant un traitement sur un signal électrique de son dit signal sonore original S1. Le dispositif 1 permet de réduire le phénomène de vibration d'un environnement d'un haut-parleur tout en permettant de conserver la perception des basses fréquences du signal S1. Ce signal S1 peut être par exemple un signal de son droit ou gauche d'un signal stéréophonique. Un traitement analogue est réalisé sur l'autre signal du signal stéréophonique. Le dispositif 1 peut être intégré notamment à une télévision numérique, un autoradio, ou un lecteur de type MP3.The Figure 1 shows a device 1 carrying out processing on an electrical signal of its so-called original sound signal S1. The device 1 makes it possible to reduce the phenomenon of vibration of an environment of a loudspeaker while making it possible to preserve the perception of the low frequencies of the signal S1. This signal S1 can for example be a right or left sound signal of a stereophonic signal. Similar processing is performed on the other signal of the stereophonic signal. The device 1 can be integrated in particular into a digital television, a car radio, or an MP3-type player.

A cet effet, le dispositif 1 comporte un ensemble A de blocs fonctionnels assurant la génération et l'introduction d'harmoniques à l'intérieur du signal original S1 à partir d'une partie basse fréquences dudit signal original S1 ainsi qu'un ensemble B de blocs assurant l'extraction de la bande basse fréquence du signal sonore original générant des vibrations de l'environnement du haut-parleur, dite « bande fréquentielle vibratoire ». Cette bande fréquentielle vibratoire est identifiée par l'opérateur en appliquant au haut-parleur un signal à fréquence variable et en identifiant la bande de fréquences pour laquelle il perçoit « à l'oreille » des vibrations de l'environnement du haut-parleur. Cette bande vibratoire est située en dessous de la fréquence de coupure fc du haut-parleur.To this end, the device 1 comprises a set A of functional blocks ensuring the generation and introduction of harmonics inside the original signal S1 from a low-frequency part of said original signal S1 as well as a set B blocks ensuring the extraction of the low frequency band of the original sound signal generating vibrations of the environment of the loudspeaker, called "vibratory frequency band". This vibratory frequency band is identified by the operator by applying a variable frequency signal to the loudspeaker and by identifying the frequency band for which he perceives “by ear” vibrations of the loudspeaker environment. This vibratory band is located below the cut-off frequency fc of the loudspeaker.

Plus précisément, l'ensemble A comporte un filtre passe-bas FLP1 appliqué au signal original S1 de manière à obtenir un signal S2 sonore original basse fréquence. Dans un exemple, la fréquence de coupure du filtre FLP1 est proche de la fréquence de coupure fc du haut-parleur HP qui est de l'ordre de 100Hz.More precisely, the set A comprises a low-pass filter FLP1 applied to the original signal S1 so as to obtain an original low-frequency sound signal S2. In one example, the cut-off frequency of the filter FLP1 is close to the cut-off frequency fc of the loudspeaker HP which is of the order of 100 Hz.

Le signal S2 est ensuite appliqué en entrée d'un module H1 permettant de générer en sortie un signal S3 d'harmoniques. Les harmoniques contenues dans le signal S3 sont des multiples des fréquences du signal S2 sonore basse fréquence. Dans un exemple, on conserve uniquement les harmoniques de rang 1 et 2. Pour générer ces harmoniques, le module H1 supprime par exemple la partie négative du signal temporel S3 (module H1 dit « Half Wave rectifier» en anglais) ou redresse la partie négative du signal temporel S2 (module H1 dit « Full Wave rectifier»). Par « redresser », on entend multiplier par -1 les valeurs en gain négatives du signal sonore basse fréquence S2 sous forme temporel. Ensuite la composante continue ainsi créée est supprimée à l'aide d'un filtre passe haut dont la fréquence de coupure est très basse (de l'ordre de 20Hz).The signal S2 is then applied to the input of a module H1 making it possible to generate a harmonic signal S3 at the output. The harmonics contained in the signal S3 are multiples of the frequencies of the low frequency sound signal S2. In one example, only the 1st and 2nd order harmonics are kept. To generate these harmonics, the H1 module, for example, removes the negative part of the time signal S3 (H1 module called “Half Wave rectify” in English) or corrects the negative part. time signal S2 (H1 module called “Full Wave rectifier”). Through “Straightening” is understood to mean multiplying by -1 the negative gain values of the low-frequency sound signal S2 in temporal form. Then the DC component thus created is removed using a high pass filter whose cut-off frequency is very low (of the order of 20 Hz).

Le signal S3 est appliqué en entrée d'un module D1 assurant un décalage fréquentiel des raies du spectre fréquentiel du signal d'harmoniques S3, de sorte que certaines harmoniques situées en dessous de la fréquence de coupure fc du haut-parleur HP sont décalées au-delà de ladite fréquence de coupure fc du haut-parleur. A cet effet, la fréquence de chacune des raies spectrales du signal S3 est multipliée par N entier, N valant de préférence 2. On garantit ainsi que la majorité des harmoniques générées seront situées dans la bande de fonctionnement optimale du haut-parleur HP. Au préalable, le signal S3 aura été de préférence égalisé à l'aide du module E1. On rappelle qu'en traitement du son, l'égalisation consiste à atténuer ou à accentuer une ou plusieurs bandes de fréquences composant le signal sonore.The signal S3 is applied at the input of a module D1 ensuring a frequency shift of the lines of the frequency spectrum of the harmonics signal S3, so that certain harmonics located below the cut-off frequency fc of the loudspeaker HP are shifted to the beyond said cut-off frequency fc of the loudspeaker. To this end, the frequency of each of the spectral lines of the signal S3 is multiplied by integer N, N preferably equal to 2. It is thus guaranteed that the majority of the harmonics generated will be located in the optimum operating band of the loudspeaker HP. Beforehand, the signal S3 will preferably have been equalized using the module E1. It will be recalled that in sound processing, equalization consists in attenuating or accentuating one or more frequency bands making up the sound signal.

Le signal d'harmonique ainsi décalé, référencé S4 sur les figures, est ensuite filtré au moyen d'un filtre passe-bas FLP'1 de manière à obtenir un signal S5 dit signal d'harmoniques réduit. Le filtre FLP'1 permet ainsi de supprimer les harmoniques dans la partie haute fréquence du signal S4 inutile à la restitution du signal de basse. Dans un exemple, la fréquence de coupure du filtre passe-bas FLP'1 est supérieure à la fréquence de coupure fc du haut-parleur HP. La fréquence de coupure de FLP'1 est comprise entre 2*fc et 4*fc ou est exactement égale à une de ces valeurs limites.The harmonic signal thus shifted, referenced S4 in the figures, is then filtered by means of a low-pass filter FLP'1 so as to obtain a signal S5 called a reduced harmonics signal. The FLP'1 filter thus makes it possible to eliminate the harmonics in the high frequency part of the signal S4 which are unnecessary for the reproduction of the bass signal. In one example, the cut-off frequency of the low-pass filter FLP'1 is greater than the cut-off frequency fc of the loudspeaker HP. The cut-off frequency of FLP'1 is between 2 * fc and 4 * fc or is exactly equal to one of these limit values.

Après avoir été retardé par un module T à retard et le cas échéant égalisé par le module E2, le signal original S1 est appliqué, avec le signal S5 de préférence égalisé par le module E3 en entrée d'un dispositif C1 de combinaison. Dans un exemple, la combinaison des signaux consiste en une addition, échantillons par échantillons des signaux appliqués en entrée du dispositif C1. On note que le retard T appliqué correspond au temps de traitement du signal S1 par les modules FLP1, H1, E1, D1 et FLP'1. Ce retard T est par exemple de l'ordre de 10 échantillons.After having been delayed by a delay module T and if necessary equalized by the module E2, the original signal S1 is applied, with the signal S5 preferably equalized by the module E3 at the input of a combination device C1. In one example, the combination of the signals consists of an addition, samples by samples, of the signals applied to the input of the device C1. It is noted that the applied delay T corresponds to the processing time of the signal S1 by the modules FLP1, H1, E1, D1 and FLP'1. This delay T is for example of the order of 10 samples.

On obtient en sortie du dispositif C1 un signal S6, dit signal recombiné, traité ensuite par l'ensemble B assurant notamment la suppression de la bande fréquentielle vibratoire du signal sonore à diffuser.At the output of the device C1, a signal S6, called a recombined signal, is obtained, then processed by the assembly B ensuring in particular the elimination of the vibratory frequency band of the sound signal to be broadcast.

Plus précisément, l'ensemble B comporte un filtre passe-haut FHPa et un filtre passe-bas FLPa appliqués au signal S6 de manière à obtenir respectivement un signal S7 recombiné haute fréquence et un signal S8 recombiné basse fréquence. Les fréquences de coupure des filtres FLPa et FHPa sont de préférence identiques. Ces fréquences de coupures sont choisies proches à la fréquence de coupure fc du haut-parleur HP.More precisely, the set B comprises a high-pass filter FHPa and a low-pass filter FLPa applied to the signal S6 so as to obtain respectively a high-frequency recombined signal S7 and a low-frequency recombined signal S8. The cut-off frequencies of the filters FLPa and FHPa are preferably identical. These cut-off frequencies are chosen to be close to the cut-off frequency fc of the loudspeaker HP.

Un filtre réjecteur Frej est appliqué sur le signal S8 recombiné basse fréquence de manière à supprimer la bande fréquentielle vibratoire du signal S8. Ce filtre Frej dont le profil en traits discontinus est montré sur la Figure 3 présente les caractéristiques suivantes : une fréquence centrale f0, un gain d'atténuation H et un coefficient de qualité Q correspondant sensiblement à la largeur de la bande coupée. Ces valeurs sont bien entendu adaptées en fonction de l'amplitude de la bande fréquentielle vibratoire ainsi que de la largeur de cette bande fréquentielle vibratoire. Dans un exemple de réalisation, f0 = 60Hz, H=-12dB, Q = 5 pour une bande fréquentielle vibratoire de l'ordre de 58 à 63Hz. En variante, le filtre réjecteur Frej est remplacé par un filtre passe-haut.A rejector filter Frej is applied to the low-frequency recombined signal S8 so as to remove the vibratory frequency band of the signal S8. This Frej filter whose profile in broken lines is shown on the Figure 3 has the following characteristics: a central frequency f0, an attenuation gain H and a quality coefficient Q corresponding substantially to the width of the cut band. These values are of course adapted as a function of the amplitude of the vibratory frequency band as well as the width of this vibratory frequency band. In an exemplary embodiment, f0 = 60Hz, H = -12dB, Q = 5 for a vibratory frequency band of the order of 58 to 63Hz. As a variant, the rejector filter Frej is replaced by a high-pass filter.

Le signal S9 obtenu en sortie du filtre réjecteur Frej est appliqué en entrée d'un module L1 apte à compresser le signal S9. La compression du signal S9 consiste à réduire la dynamique du signal basse fréquence, contenant des harmoniques générées, de manière à en augmenté la puissance perçue. A cet effet, les harmoniques situées autour de la bande fréquentielle vibratoire sont augmentées. Dans un exemple de réalisation, la dynamique du signal basse fréquence est compréssée de 12dB.The signal S9 obtained at the output of the rejector filter Frej is applied at the input of a module L1 capable of compressing the signal S9. The compression of the signal S9 consists in reducing the dynamics of the low frequency signal, containing the generated harmonics, so as to increase the perceived power. For this purpose, the harmonics located around the vibratory frequency band are increased. In an exemplary embodiment, the dynamic range of the low frequency signal is compressed by 12dB.

Le signal S10 compressé obtenu en sortie du module L1 et le signal S7 recombiné haute fréquence sont appliqués en entrée d'un module C2 de combinaison, tel qu'un sommateur. Préalablement à son application en entrée du module C2, le signal S10 est de préférence égalisé à l'aide d'un module E4. Dans un exemple, la combinaison des signaux réalisée par le module C2 consiste, comme pour le module C1, en une addition, échantillons par échantillons des signaux appliqués en entrée du dispositif C2. Le signal sonore S11 obtenu en sortie du module C2 est un signal sonore appliqué en entrée du haut-parleur HP pour sa diffusion.The compressed signal S10 obtained at the output of the module L1 and the high-frequency recombined signal S7 are applied at the input of a combination module C2, such as an adder. Prior to its application to the input of the module C2, the signal S10 is preferably equalized using a module E4. In one example, the combination of signals produced by the module C2 consists, as for module C1, of an addition, samples by samples, of the signals applied to the input of device C2. The sound signal S11 obtained at the output of the module C2 is a sound signal applied to the input of the loudspeaker HP for its distribution.

On note que les harmoniques obtenues à partir de la partie basse fréquence du signal S1 et introduites dans le signal sonore vont permettre à l'auditeur de percevoir les sons basses fréquences du signal original malgré la suppression d'une partie de ces sons (la bande fréquentielle vibratoire) tout en évitant la vibration de l'environnement du haut-parleur HP.Note that the harmonics obtained from the low frequency part of the signal S1 and introduced into the sound signal will allow the listener to perceive the low frequency sounds of the original signal despite the removal of part of these sounds (the band frequency vibration) while avoiding the vibration of the environment of the loudspeaker.

En variante, le module D1 de décalage fréquentiel peut être positionné en amont du module de génération d'harmonique, comme montré par la flèche pointillée.As a variant, the frequency shift module D1 can be positioned upstream of the harmonic generation module, as shown by the dotted arrow.

La Figure 2 montre une réalisation du dispositif de traitement suivant laquelle sont générés plusieurs types d'harmoniques.The Figure 2 shows an embodiment of the processing device according to which several types of harmonics are generated.

A cet effet, plusieurs modules H1-HN associés à des filtres passe-bas FLP1-FLPN sont branchés en parallèle ou en série les uns des autres. Les signaux issus des filtres passe-bas FLP1-FLP4 sont respectivement référencés S2, S2', S2", S2‴. Les signaux d'harmoniques obtenus en sortie des module H1-H4 sont respectivement référencés S3, S3', S3", S3‴...To this end, several H1-HN modules associated with FLP1-FLPN low-pass filters are connected in parallel or in series with each other. The signals from the low-pass filters FLP1-FLP4 are respectively referenced S2, S2 ', S2 ", S2 ‴. The harmonic signals obtained at the output of the H1-H4 modules are respectively referenced S3, S3', S3", S3 ‴ ...

Dans le cas de deux systèmes de génération d'harmoniques H3 et H4 branchés en série, le signal d'harmoniques S3‴ du module H4 branché en aval est obtenu à partir du signal d'harmoniques S3ʺ généré par le module H3 branché en amont.In the case of two H3 and H4 harmonic generation systems connected in series, the S3 ‴ harmonics signal of the H4 module connected downstream is obtained from the S3ʺ harmonics signal generated by the H3 module connected upstream.

Dans le cas où plusieurs systèmes H1-HN de génération d'harmoniques sont utilisés, les modules H1-HN mettent de préférence en œuvre différentes méthodes de génération d'harmoniques ou à tout le moins présentent, pour une même méthode, des paramètres de réglage différents les uns des autres.In the event that several H1-HN harmonic generation systems are used, the H1-HN modules preferably implement different harmonic generation methods or at least present, for the same method, adjustment parameters. different from each other.

Les signaux S3, S3′, S3ʺ, S3‴ issus des systèmes de génération d'harmoniques H1-H4 sont appliqués en entrée d'un dispositif C3 de combinaison des signaux tels qu'un sommateur réalisant des opérations d'addition identiques à celles des sommateurs C1 et C2. De préférence, les signaux S3, S3′, S3ʺ, S3‴ obtenus en sortie des systèmes H1-HN de génération d'harmoniques sont égalisés à l'aide de modules E1, E5, E6, E7 préalablement à leur application en entrée du dispositif C3 de combinaison. On obtient en sortie du dispositif C3 un signal S3g dit signal global d'harmoniques.The signals S3, S3 ′, S3ʺ, S3 ‴ coming from the H1-H4 harmonic generation systems are applied to the input of a device C3 for combining the signals such as an adder performing operations of addition identical to those of the summers C1 and C2. Preferably, the signals S3, S3 ′, S3ʺ, S3 ‴ obtained at the output of the H1-HN harmonic generation systems are equalized using modules E1, E5, E6, E7 prior to their application at the input of the device. Combination C3. At the output of the device C3, a signal S3g called the global harmonic signal is obtained.

Les étapes de traitement subséquentes effectuées sur le signal S3g obtenu en sortie du dispositif de combinaison C3 sont identiques aux étapes de traitement réalisées sur le signal S3 issu du module H1 de la Figure 1. Autrement dit, mis à part l'augmentation du nombre de modules H1-HN de génération d'harmoniques, le reste du dispositif 1 demeure inchangé par rapport à celui représenté sur la Figure 1.The subsequent processing steps carried out on the signal S3g obtained at the output of the combination device C3 are identical to the processing steps carried out on the signal S3 coming from the module H1 of the Figure 1 . In other words, apart from the increase in the number of H1-HN harmonic generation modules, the rest of device 1 remains unchanged compared to that shown on the diagram. Figure 1 .

Claims (7)

  1. Method for reducing parasitic vibrations of a loudspeaker environment while allowing to maintain the perception of the low frequencies of an electric sound signal (S1), called original sound signal, intended to be broadcast after processing by said loudspeaker (HP) having a cut-off frequency (fc),
    the method including the following steps:
    - identifying a frequency band that causes the environment of the loudspeaker (HP) to vibrate, called vibration frequency band,
    - isolating a low frequency band (S2) of the original sound signal (S1) having as upper limit a frequency close to the cut-off frequency (fc) of the loudspeaker (HP),
    - generating at least one harmonic signal (S3) from the isolated low frequency band (S2) of the original sound signal (S3), and
    - combining the original sound signal (S1) and the harmonic signal (S3) to obtain a recombined signal (S6),
    the method characterised in that it includes the step of:
    - removing the vibration frequency band of a low frequency band from the recombined signal (S6) by means of a lowpass filter (FLPa) and subsequently a rejection filter (Frej), then combining the signal (S9) obtained, after compression of said signal (S9) obtained, with a highfrequency recombined signal (S7) obtained from the recombined signal (S6) by means of a high-pass filter (FHPa) to obtain a signal that can be broadcast by the loudspeaker (HP) .
  2. Method according to claim 1, characterised in that it includes the step of frequentially offsetting lines of the frequency spectrum of the harmonic signal (S3), so that some harmonics located below the cut-off frequency (fc) of the loudspeaker (HP) are offset beyond said cut-off frequency (fc) of the loudspeaker (HP) for broadcast by the loudspeaker.
  3. Method according to claims 1 or 2, characterised in that it includes the step of compressing the dynamic of the low frequency portion of the recombined signal (S6) after having removed the vibration frequency band, in such a way as to increase the perceived power of the spectral lines of the recombined signal (S6) located around the vibration frequency band.
  4. Method according to one of claims 1 to 3, characterised in that it includes the step of generating a plurality of harmonic signals (S3, S3′, S3ʺ, S3‴) and combining the harmonic signals to obtain a signal called global harmonic signal (S3g), this global harmonic signal (S3g) being combined with the original sound signal to obtain the recombined signal (S6).
  5. Method according to claim 4, characterised in that it includes the step of generating at least one harmonic signal (S3‴) from a harmonic signal (S3") previously generated from the low frequency band (S2) of the original sound signal (S1).
  6. Method according to one of claims 1 to 5, characterised in that to generate the harmonics contained in the harmonic signals (S3, S3′, S3ʺ, S3‴), it includes the step of removing or of temporarily correcting the negative portion of the signal of the low frequency band and a step of removing the continuous component thus created.
  7. Device for processing a sound signal characterised in that it includes means adapted to implement the method according to one of claims 1 to 6.
EP12783212.9A 2011-11-07 2012-11-06 Method of reducing parasitic vibrations in an environment of a loudspeaker and apparatus suitable therefor. Active EP2777299B1 (en)

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FR1160116A FR2982404B1 (en) 2011-11-07 2011-11-07 METHOD FOR REDUCING PARASITIC VIBRATIONS OF A SPEAKER ENVIRONMENT FOR PRESERVING PERCEPTION OF THE LOW FREQUENCIES OF THE SIGNAL TO BE DISTRIBUTED AND ASSOCIATED PROCESSING DEVICE
PCT/EP2012/071948 WO2013068359A1 (en) 2011-11-07 2012-11-06 Method for reducing parasitic vibrations of a loudspeaker environment and associated processing device

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US10609475B2 (en) 2014-12-05 2020-03-31 Stages Llc Active noise control and customized audio system
US9747367B2 (en) 2014-12-05 2017-08-29 Stages Llc Communication system for establishing and providing preferred audio
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US9980075B1 (en) 2016-11-18 2018-05-22 Stages Llc Audio source spatialization relative to orientation sensor and output
US9980042B1 (en) 2016-11-18 2018-05-22 Stages Llc Beamformer direction of arrival and orientation analysis system
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Family Cites Families (9)

* Cited by examiner, † Cited by third party
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WO2000057673A1 (en) * 1999-03-24 2000-09-28 Koninklijke Philips Electronics N.V. Band stop filter
CN100426382C (en) 2000-07-26 2008-10-15 希捷科技有限公司 Downstream finned stripper shroud airstream conditioning apparatus for a disc drive
US7079660B2 (en) * 2001-04-16 2006-07-18 Rohm Co., Ltd. Bass compensation device and a sound system using the device
JP4286510B2 (en) * 2002-09-09 2009-07-01 パナソニック株式会社 Acoustic signal processing apparatus and method
JP4666229B2 (en) * 2006-10-18 2011-04-06 ソニー株式会社 Audio playback device
KR101310231B1 (en) * 2007-01-18 2013-09-25 삼성전자주식회사 Apparatus and method for enhancing bass
JP5588780B2 (en) * 2009-09-09 2014-09-10 ローム株式会社 Pseudo bass generator and generation method
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