EP2777299B1 - Verfahren zur reduktion parasitischer vibrationen in einer umgebung eines lautsprechers und dazu geeignete vorrichtung. - Google Patents

Verfahren zur reduktion parasitischer vibrationen in einer umgebung eines lautsprechers und dazu geeignete vorrichtung. 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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English (en)
French (fr)
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EP2777299A1 (de
Inventor
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.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Claims (7)

  1. Verfahren zur Verringerung parasitärer Schwingungen einer Umgebung eines Lautsprechers unter Ermöglichung der Beibehaltung der Wahrnehmung der Bässe eines elektrischen Signals (S1) eines Schalls, Original-Schallsignal genannt, das dazu bestimmt ist, nach Verarbeitung durch den Lautsprecher (HP), der eine Grenzfrequenz (fc) aufweist, ausgestrahlt zu werden,
    wobei das Verfahren die folgenden Schritte beinhaltet:
    - Identifizieren eines Bandes an Frequenzen, welches die Umgebung eines Lautsprechers (HP) an Schwingungen eintreten lässt, welches Schwingungsfrequenzband genannt wird,
    - Isolieren eines Bandes (S2) an Niederfrequenzen aus dem Original-Schallsignal (S1), das als obere Grenze eine Frequenz nahe der Grenzfrequenz (fc) des Lautsprechers (HP) aufweist,
    - Erzeugen mindestens eines Oberschwingungssignals (S3) ausgehend von dem Band an Niederfrequenzen (S2) des isolierten Original-Schallsignals (S3), und
    - Kombinieren des Original-Schallsignals (S1) und des Oberschwingungssignals (S3), um ein rekombinantes Signal (S6) zu erhalten, wobei das Verfahren dadurch
    gekennzeichnet ist, dass es den folgenden Schritt beinhaltet:
    - Löschen des Schwingungsfrequenzbandes aus einem Niederfrequenzband des rekombinanten Signals (S6) anhand eines Tiefpassfilters (FLPa), danach eines Sperrfilters (Frej), danach Kombinieren des erhaltenen Signals (S9), nach dem Komprimieren des erhaltenen Signals (S9), mit einem rekombinanten Signal (S7) an Hochfrequenzen, das aus dem rekombinanten Signal (S6) anhand eines Hochpassfilters (FHPa) erhalten wird, um ein durch den Lautsprecher (HP) ausstrahlbares Signal zu erhalten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es den Schritt der Frequenzverschiebung der Linien des Frequenzspektrums des Oberschwingungssignals (S3) derart beinhaltet, dass bestimmte Obertöne, die sich unterhalb der Grenzfrequenz (fc) des Lautsprechers (HP) befinden, über die Grenzfrequenz (fc) des Lautsprechers (HP) hinaus für eine Ausstrahlung durch den Lautsprecher versetzt werden.
  3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass es den Schritt des Komprimierens des Dynamikbereichs des Niederfrequenzteils des rekombinanten Signals (S6) beinhaltet, nachdem daraus das Schwingungsfrequenzband herausgelöscht worden ist, um die wahrgenommene Leistung der Spektrallinien des rekombinanten Signals (S6), die sich um das Schwingungsfrequenzband herum befinden, zu erhöhen.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass es den Schritt des Erzeugens von mehreren Oberschwingungssignalen (S3, S3′, S3ʺ, S3‴) und des Kombinierens der Oberschwingungssignale beinhaltet, um ein globales Oberschwingungssignal (S3g) genanntes Signal zu erhalten, wobei dieses globale Oberschwingungssignal (S3g) mit dem Original-Schallsignal kombiniert wird, um das rekombinante Signal (S6) zu erhalten.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass es den Schritt des Erzeugens von mindestens einem Oberschwingungssignal (S3‴) ausgehend von einem zuvor erzeugten Oberschwingungssignal (S3ʺ) aus dem Band von Niederfrequenzen (S2) des Original-Schallsignals (S1) beinhaltet.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass es zum Erzeugen der in dem Oberschwingungssignal (S3, S3′, S3ʺ, S3‴) enthaltenen Oberschwingungen den Schritt des Löschens oder des vorübergehenden Aufrichtens des negativen Teils des Signals des Bandes an Niederfrequenzen und einen Schritt des Entfernens der so erstellten Gleichkomponente beinhaltet.
  7. Vorrichtung zur Verarbeitung eines Schallsignals, dadurch gekennzeichnet, dass sie Mittel beinhaltet, die zur Umsetzung des Verfahrens nach einem der Ansprüche 1 bis 6 angepasst sind.
EP12783212.9A 2011-11-07 2012-11-06 Verfahren zur reduktion parasitischer vibrationen in einer umgebung eines lautsprechers und dazu geeignete vorrichtung. Active EP2777299B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1160116A FR2982404B1 (fr) 2011-11-07 2011-11-07 Procede de reduction de vibrations parasites d'un environnement d'un haut-parleur permettant de conserver la perception des basses frequences du signal a diffuser et dispositif de traitement associe
PCT/EP2012/071948 WO2013068359A1 (fr) 2011-11-07 2012-11-06 Procede de reduction de vibrations parasites d'un environnement d'un haut-parleur et dispositif de traitement associe

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EP2777299A1 EP2777299A1 (de) 2014-09-17
EP2777299B1 true EP2777299B1 (de) 2022-01-05

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US (1) US9443502B2 (de)
EP (1) EP2777299B1 (de)
KR (1) KR20140089424A (de)
CN (1) CN104115510B (de)
FR (1) FR2982404B1 (de)
WO (1) WO2013068359A1 (de)

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US9747367B2 (en) 2014-12-05 2017-08-29 Stages Llc Communication system for establishing and providing preferred audio
US9508335B2 (en) 2014-12-05 2016-11-29 Stages Pcs, Llc Active noise control and customized audio system
US9654868B2 (en) 2014-12-05 2017-05-16 Stages Llc Multi-channel multi-domain source identification and tracking
US10609475B2 (en) 2014-12-05 2020-03-31 Stages Llc Active noise control and customized audio system
FR3052951B1 (fr) 2016-06-20 2020-02-28 Arkamys Procede et systeme pour l'optimisation du rendu sonore de basses frequences d'un signal audio
US9980042B1 (en) 2016-11-18 2018-05-22 Stages Llc Beamformer direction of arrival and orientation analysis system
US9980075B1 (en) 2016-11-18 2018-05-22 Stages Llc Audio source spatialization relative to orientation sensor and output
US10945080B2 (en) 2016-11-18 2021-03-09 Stages Llc Audio analysis and processing system
FR3087076B1 (fr) * 2018-10-08 2022-02-25 Arkamys Procede et dispositif de controle de la distorsion d’un systeme de haut-parleurs embarque dans un vehicule

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TW343417B (en) * 1996-05-08 1998-10-21 Philips Eloctronics N V Circuit, audio system and method for processing signals, and a harmonics generator
KR20010043780A (ko) * 1999-03-24 2001-05-25 요트.게.아. 롤페즈 오디오 시스템 및 대역 저지 필터
US7054103B2 (en) 2000-07-26 2006-05-30 Seagate Technology Llc Downstream finned stripper shroud airstream conditioning apparatus for a disc drive
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JP4286510B2 (ja) * 2002-09-09 2009-07-01 パナソニック株式会社 音響信号処理装置及びその方法
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US20140301568A1 (en) 2014-10-09
FR2982404A1 (fr) 2013-05-10
WO2013068359A1 (fr) 2013-05-16
FR2982404B1 (fr) 2014-01-03
EP2777299A1 (de) 2014-09-17
CN104115510A (zh) 2014-10-22
CN104115510B (zh) 2017-06-20
US9443502B2 (en) 2016-09-13
KR20140089424A (ko) 2014-07-14

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