EP2777299A1 - Procede de reduction de vibrations parasites d'un environnement d'un haut-parleur et dispositif de traitement associe - Google Patents
Procede de reduction de vibrations parasites d'un environnement d'un haut-parleur et dispositif de traitement associeInfo
- Publication number
- EP2777299A1 EP2777299A1 EP12783212.9A EP12783212A EP2777299A1 EP 2777299 A1 EP2777299 A1 EP 2777299A1 EP 12783212 A EP12783212 A EP 12783212A EP 2777299 A1 EP2777299 A1 EP 2777299A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- frequency band
- loudspeaker
- frequency
- harmonic
- 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
- G10K11/002—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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers
- H04R3/04—Circuits for transducers for correcting frequency response
Definitions
- Document US 2002 015255 describes a so-called “bass compensation” method applicable to a loudspeaker whose dimensions are too small to reproduce the low frequencies. This method aims to produce a rich bass sound without distortion of said sound by the speaker itself. [04]
- the invention relates to a method of reducing "rattle noise" to maintain the perception of low frequencies of the signal to be broadcast and 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.
- the object of the invention is to remedy this drawback by proposing a method that reduces or eliminates the parasitic vibrations of one in the environment of a loudspeaker while allowing the perception of the low frequencies of the sound signal to be retained. original.
- harmonics from the low frequency part of the original signal are generated and introduced into the part of the sound signal that can be restored by the loudspeaker. In this way, the listener will perceive, by sound reconstruction made by the brain, the sound of the removed low frequency part.
- the invention therefore relates to a method of reducing parasitic vibrations in the environment of a speaker while maintaining the bass perception of an electrical sound signal, said original sound signal, intended to be broadcast after treatment by said loudspeaker having a cutoff frequency,
- the vibratory frequency band identifying a frequency band bringing the environment of the loudspeaker into vibration, called the vibratory frequency band
- the method comprises the step of frequency shifting frequencies of the frequency spectrum of the harmonic signal, so that certain harmonics below the loudspeaker cutoff frequency are shifted beyond said speaker cut-off frequency for broadcast by the loudspeaker.
- the method comprises the step of compressing the dynamics of the low frequency part of the recombined signal after having removed the frequency band vibratory, 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 a plurality of harmonic signals and combining the harmonic signals to obtain a signal called the global harmonic signal, this global harmonic signal being combined with the original sound signal to obtain the recombined signal.
- the method comprises the step of generating at least one harmonic signal from a harmonic signal previously generated from the low frequency band of the original sound signal.
- the method comprises a step of deleting or temporally rectifying the negative part of the signal of the low frequency band and a step of removing the component continues thus created.
- the invention further relates to a sound signal processing device characterized in that it comprises means adapted for the implementation of the method according to the invention.
- 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 are generated several types of harmonics
- 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 speaker.
- Figure 1 shows a device 1 performing a treatment on an electrical signal of said original sound signal S1.
- the device 1 makes it possible to reduce the phenomenon of vibration of an environment of a loudspeaker while preserving the perception of the low frequencies of the signal S1.
- This signal S1 may be for example a signal of its right or left of a stereophonic signal. Analogous processing is performed on the other signal of the stereophonic signal.
- the device 1 can be integrated in particular to a digital television, a car radio, or an MP3 player type.
- the device 1 comprises an assembly 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 of 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 to the loudspeaker a variable frequency signal and identifying the frequency band for which he perceives "by ear” vibrations of the environment of the loudspeaker. This vibratory band is located below the cutoff frequency fc of the loudspeaker.
- the set A comprises a low-pass filter FLP1 applied to the original signal S1 so as to obtain a signal S2 sound original low frequency.
- the cutoff frequency of the filter FLP1 is close to the cutoff frequency fc of the speaker HP which is of the order of 100Hz.
- the signal S2 is then applied to the input of a module H1 for outputting a signal S3 of harmonics.
- the harmonics contained in the signal S3 are multiples of the frequencies of the signal S2 sound low frequency. In one example, only harmonics of rank 1 and 2 are retained.
- the module H1 for example suppresses the negative part of the temporal signal S3 (module H1 called “Half Wave rectifier” in English) or rectifies the negative part of the temporal signal S2 (module H1 called “Full Wave rectifier”).
- “Straighten” is meant to multiply by -1 the negative gain values of the low frequency sound signal S2 in time form.
- the signal S3 is applied at the input of a module D1 providing a frequency offset of the frequency spectrum of the lines of the S3 harmonic signal, so that certain harmonics below the cutoff frequency fc of the speaker HP are shifted beyond said cutoff frequency fc of the loudspeaker.
- the frequency of each of the spectral lines of the signal S3 is multiplied by N integer, N being preferably equal to 2. It is thus ensured that the majority of the harmonics generated will be located in the optimum operating band of the loudspeaker HP.
- the signal S3 has preferably been equalized using the module E1. It is recalled that in sound processing, the equalization consists in attenuating or accentuating one or more frequency bands composing the sound signal.
- the harmonic signal and 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 said harmonic signal reduced.
- the filter FLP'1 thus makes it possible to eliminate the harmonics in the high frequency part of the signal S4 that is not needed 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 cutoff 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 a sample-by-sample addition of the signals applied at 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.
- 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 recombinant signal S7 and a low frequency recombined signal S8.
- the cut-off frequencies of the filters FLPa and FHPa are preferably identical. These cutoff frequencies are chosen are chosen close to the cutoff frequency fc of the speaker HP.
- a rejector filter Frej is applied to the low frequency recombined signal S8 so as to eliminate the vibratory frequency band of the signal S8.
- This Frej filter whose profile in broken lines is shown in FIG. 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 strip. These values are of course adapted according to the amplitude of the vibratory frequency band and 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 able to compress the signal S9.
- the compression of the signal S9 consists in reducing the dynamics of the low frequency signal, containing generated harmonics, so as to increase the perceived power. For this purpose, the harmonics around the vibratory frequency band are increased.
- the dynamics of the low frequency signal is compressed by 12 dB.
- the compressed signal S10 obtained at the output of the module L1 and the high frequency recombined signal S7 are inputted to a combination module C2, such as an adder. Prior to its application at the input of the module C2, the signal S10 is preferably equalized using a module E4.
- the combination of signals made by the module C2 consists, as for the module C1, in an addition, samples by samples of the signals applied at the input of the device C2.
- the sound signal S1 1 obtained at the output of the module C2 is a sound signal applied at the input of the loudspeaker HP for its diffusion.
- 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 some of these sounds. (the vibratory frequency band) while avoiding the vibration of the speaker environment HP.
- the frequency shift module D1 may be positioned upstream of the harmonic generation module, as shown by the dotted arrow.
- FIG. 2 shows an embodiment of the processing device according to which are generated several types of harmonics.
- H1 -HN modules associated with low-pass filters FLP1-FLPN 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 modules H1-H4 are respectively referenced S3, S3 ', S3 ", S3'” ...
- the harmonic signal S3 '' of the downstream connected module H4 is obtained from the harmonic signal S3 'generated by the upstream connected module H3.
- the H1 -HN modules preferably implement different harmonic generation methods or at least have, for the same method, setting parameters different from each other.
- the signals S3, S3 ', S3 ", S3'” coming from harmonic generation systems H1-H4 are applied at the input of a signal combining device C3 such that an adder carrying out operations identical to those of the summers C1 and C2.
- the signals S3, S3 ', S3 ", S3'” obtained at the output of the harmonic generation systems H1-HN are equalized using modules E1, E5, E6, E7 prior to their input application. of the combination device C3.
- a signal S3g known as the global harmonic signal, is obtained.
Landscapes
- 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)
Abstract
Description
Claims
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2777299A1 true EP2777299A1 (fr) | 2014-09-17 |
| EP2777299B1 EP2777299B1 (fr) | 2022-01-05 |
Family
ID=47143907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12783212.9A Active EP2777299B1 (fr) | 2011-11-07 | 2012-11-06 | Procédé de réduction de vibrations parasites d'un environnement d'un haut-parleur et dispositif de traitement associé |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9443502B2 (fr) |
| EP (1) | EP2777299B1 (fr) |
| KR (1) | KR20140089424A (fr) |
| CN (1) | CN104115510B (fr) |
| FR (1) | FR2982404B1 (fr) |
| WO (1) | WO2013068359A1 (fr) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9654868B2 (en) | 2014-12-05 | 2017-05-16 | Stages Llc | Multi-channel multi-domain source identification and tracking |
| US9508335B2 (en) | 2014-12-05 | 2016-11-29 | Stages Pcs, 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 |
| 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 |
| US10945080B2 (en) | 2016-11-18 | 2021-03-09 | Stages Llc | Audio analysis and processing system |
| US9980075B1 (en) | 2016-11-18 | 2018-05-22 | Stages Llc | Audio source spatialization relative to orientation sensor and output |
| 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 |
| JP7520989B2 (ja) * | 2020-02-25 | 2024-07-23 | ボーズ・コーポレーション | 狭帯域の除去 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW343417B (en) * | 1996-05-08 | 1998-10-21 | Philips Eloctronics N V | Circuit, audio system and method for processing signals, and a harmonics generator |
| CN1296722A (zh) * | 1999-03-24 | 2001-05-23 | 皇家菲利浦电子有限公司 | 带阻滤波器 |
| KR100564210B1 (ko) | 2000-07-26 | 2006-03-28 | 시게이트 테크놀로지 엘엘씨 | 데이터 저장 장치용 공기 스트림 조절 장치 및 그 공기 스트림 조절 장치를 구비한 디스크 드라이브 |
| US7079660B2 (en) * | 2001-04-16 | 2006-07-18 | Rohm Co., Ltd. | Bass compensation device and a sound system using the device |
| 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 |
| JP4666229B2 (ja) * | 2006-10-18 | 2011-04-06 | ソニー株式会社 | オーディオ再生装置 |
| KR101310231B1 (ko) * | 2007-01-18 | 2013-09-25 | 삼성전자주식회사 | 저음 증강 장치 및 방법 |
| JP5588780B2 (ja) * | 2009-09-09 | 2014-09-10 | ローム株式会社 | 疑似低音の発生器および発生方法 |
| US20120134504A1 (en) * | 2010-11-26 | 2012-05-31 | Lockheed Martin Corporation | Chaotic pulse train synthesizer |
-
2011
- 2011-11-07 FR FR1160116A patent/FR2982404B1/fr active Active
-
2012
- 2012-11-06 US US14/356,093 patent/US9443502B2/en active Active
- 2012-11-06 WO PCT/EP2012/071948 patent/WO2013068359A1/fr not_active Ceased
- 2012-11-06 EP EP12783212.9A patent/EP2777299B1/fr active Active
- 2012-11-06 KR KR1020147015360A patent/KR20140089424A/ko not_active Ceased
- 2012-11-06 CN CN201280054768.6A patent/CN104115510B/zh active Active
Non-Patent Citations (2)
| Title |
|---|
| None * |
| See also references of WO2013068359A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104115510A (zh) | 2014-10-22 |
| FR2982404A1 (fr) | 2013-05-10 |
| EP2777299B1 (fr) | 2022-01-05 |
| CN104115510B (zh) | 2017-06-20 |
| WO2013068359A1 (fr) | 2013-05-16 |
| KR20140089424A (ko) | 2014-07-14 |
| FR2982404B1 (fr) | 2014-01-03 |
| US20140301568A1 (en) | 2014-10-09 |
| US9443502B2 (en) | 2016-09-13 |
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