EP3864859B1 - Acoustic system with spatial effect - Google Patents
Acoustic system with spatial effect Download PDFInfo
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- EP3864859B1 EP3864859B1 EP19783045.8A EP19783045A EP3864859B1 EP 3864859 B1 EP3864859 B1 EP 3864859B1 EP 19783045 A EP19783045 A EP 19783045A EP 3864859 B1 EP3864859 B1 EP 3864859B1
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- European Patent Office
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- loudspeaker
- frequency
- signal
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- signals
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- 101000878595 Arabidopsis thaliana Squalene synthase 1 Proteins 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 101000713575 Homo sapiens Tubulin beta-3 chain Proteins 0.000 claims description 4
- 102100036790 Tubulin beta-3 chain Human genes 0.000 claims description 4
- 230000004069 differentiation Effects 0.000 description 8
- 230000001154 acute effect Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 3
- ZYXYTGQFPZEUFX-UHFFFAOYSA-N benzpyrimoxan Chemical compound O1C(OCCC1)C=1C(=NC=NC=1)OCC1=CC=C(C=C1)C(F)(F)F ZYXYTGQFPZEUFX-UHFFFAOYSA-N 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
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- 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
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
- H04R2201/401—2D or 3D arrays of transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/03—Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/07—Generation or adaptation of the Low Frequency Effect [LFE] channel, e.g. distribution or signal processing
Definitions
- the invention also relates to a corresponding method.
- acoustic systems adapted to broadcast sound in stereophony, more commonly called stereo, from two channels, left and right, broadcast respectively by two loudspeakers generally directed substantially parallel towards a listener
- stereo stereophony
- a technique aims to reconstitute a spatial distribution of sound sources, as if the listener were, for example, in front of an orchestra.
- Two-speaker stereo systems are satisfactory and appreciated for their simplicity. However, they sometimes lack depth. Indeed, the listener is able to isolate the origin of sounds in a left-right direction, but not or little in a perpendicular and substantially horizontal direction materializing the depth. Thus, this system does not make it possible to distinguish sounds coming, for example, from the back or from the front of an orchestra.
- An aim of the invention is therefore to provide an acoustic system as described above, and giving the impression of depth of sound to the listener, while remaining simple and easy to implement.
- the invention is defined by an acoustic system according to claim 1.
- the acoustic system comprises one or more of the characteristics corresponding to claims 2 to 9, taken in all technically possible combinations.
- the invention is also defined by a method according to claim 10.
- the acoustic system 1 is adapted to broadcast sound from sound channels S i , i being an integer between 1 and N , N being the number of channels and being greater than or equal to 2.
- the acoustic system 1 comprises a chassis 5 , M HP speaker j structurally analogous to each other and mounted on the chassis 5, and processing electronics 10 adapted to send M speaker signals SS j respectively to the HP speakers j , j being an integer included between 1 and M.
- M is greater than or equal to two. In the example shown on the figure 1 , M is equal to 3.
- M is equal to 3.
- M is equal to 4.
- M is strictly greater than 4.
- the chassis 5 advantageously forms a box defining openings 12 in which the speakers HP 1 , HP 2 , HP 3 are mounted.
- the chassis 5 has for example a circular shape when viewed along a substantially vertical Z axis.
- the HP j speakers are mounted so as to diffuse sound centrifugally with respect to the Z axis.
- the HP j speakers define axes D j , that is to say D1, D2, D3 in the example.
- the HP j speakers are arranged so that the axes D j of two successive speakers form an angle ⁇ substantially equal to 360° divided by M , that is to say 120° in the example shown .
- HP j speakers are structurally analogous to each other.
- the HP j speakers are for example located at the same distance E1 from the Z axis.
- the assembly formed by the HP j speakers fits in a sphere 14 having a diameter E2 advantageously less than 1 m.
- the processing electronics 10 comprises a processing unit 20 adapted to prepare the M loudspeaker signals SS j from the N channels S l .
- the processing electronics 10 comprises a connector 22 adapted to be connected to a source 24 of digital signals SN, such as a mobile telephone, a personal computer or an internet source, and a converter 25 for converting the digital signals SN in the channels S l .
- the converter 25 is absent if the source 24 directly delivers the channels S i .
- the processing electronics 10 is advantageously located in the chassis 5 (although shown externally on the figure 1 for reasons of clarity).
- the processing electronics 10 comprises a reader (not shown) of sound files recorded for example on compact discs.
- the processing electronics 10 comprises a memory containing sound files capable of being read and converted by the converter 25 into analog signals.
- the processing unit 20 comprises a frequency selector 26 adapted to extract signals from each channel S i , and a splitter 28 configured to form the loudspeaker signals SS j from the extracted signals.
- the frequency selector 26 is adapted to extract, from each channel S i , a low frequency signal Si, LF , in which the audio frequencies of the channel S i greater than a first predetermined frequency f1 are reduced, and at least another signal Si, MF , in which the audio frequencies of the channel S l lower than the first frequency f1 are reduced. If the channel S i is not supposed to include audio frequencies higher than the first frequency f1, the other signal S i , MF is not extracted, as we will see later.
- the first frequency f1 is, for example, greater than or equal to 200 Hz and less than or equal to 500 Hz.
- the frequency selector 26 is also adapted to extract a high frequency signal S i , HF in which the audio frequencies of the channel S i lower than a second frequency f2 are reduced, the second frequency f2 being greater than the first frequency f1.
- the frequency selector 26 is adapted so that, in each of the other signals S i, MF , the audio frequencies higher than the second frequency f2 are also reduced.
- the second frequency f2 is, for example, greater than or equal to 1000 Hz, preferably 3000 Hz, and less than or equal to 10000 Hz, preferably 4000 Hz.
- the frequency selector 26 comprises a low-pass filter 30 i with cutoff frequency f1 to extract the low frequency signals S i , LF , a bandpass filter 32 i having cutoff frequencies f1 and f2 to extract the other signals S i , MF and finally a high-pass filter 34 i having a cutoff frequency f2 to obtain the high frequency signal S i , HF .
- the audio frequencies higher than the frequency f1 are reduced all the more as the low pass filter 30 i is effective.
- the audio frequencies lower than f1 and higher than f2 are all the more reduced as the bandpass filter 32 i is effective and, in the high frequency signals S i , HF , audio frequencies below frequency f2 are reduced all the more as the high pass filter 34 i is effective.
- the distributor 28 comprises a first adder 36 adapted to sum the low-frequency signals S 1 , LF to S N , LF and obtain a common bass component SS LF , and a multiplier 38 to multiply a common bass component SS LF by a coefficient G LF .
- the distributor 28 also includes, for each loudspeaker HP j , N multipliers 40 1,j to 40 N,j to multiply the other signals S 1 , MF to S N , MF respectively by coefficients G 1 , j , MF to G N , j , MF , and a second adder 42 j to sum the multiplied signals obtained and obtain a specific component SS j , MF .
- the distributor 28 advantageously comprises a third adder 44 for summing the possible high frequency signals S 1,HF to S N,HF , and a multiplier 46 for multiplying the sum by a coefficient G HF and obtaining a common acute component SS HF .
- the distributor 28 finally includes, for each loudspeaker HP j , a fourth adder 48 j to sum the common bass component SS LF , the specific component SS j , MF and the common acute component SS HF and obtain the loudspeaker signal SS j .
- the source 24 is connected to the connector 22 to which it sends the digital signals SN received by the converter 25.
- the latter converts the digital signals SN into the N channels S i .
- the low-pass filter 30 i filters the audio frequencies higher than the frequency f1 and the low frequency signal S i , LF is obtained.
- the bandpass filter 32 i filters the audio frequencies lower than the frequency f1 and those higher than the frequency f2 and the other signal S i , MF is obtained.
- the high pass filter 34 i filters the audio frequencies lower than the frequency f2 and the high frequency signal S i , HF is obtained.
- the low frequency signals S i , LF , the other signals S i , MF and the high frequency signals S i , HF are sent to the distributor 28 which performs linear combinations to form the loudspeaker signals SS j .
- the common bass component SS LF is, as its name indicates, common to all loudspeakers and is worth G LF * (S 1,LF + ... + S N,LF ).
- the common acute component SS HF is, as its name indicates, common to all HP j loudspeakers and is worth G HF * (S 1,HF + ... + S N,HF ).
- the specific component SS j , MF is particular to each loudspeaker and is worth G 1,j , MF * S 1,MF + ... + G N,j , MF * S N,MF .
- At least two of the specific components SS j , MF are different from each other. This allows in particular a lateralization effect.
- the summation 48 j adds the sum of the common bass component SS LF , the common acute component SS HF , and the specific component SS j , MF to obtain the loudspeaker signal SS speaker j .
- Each signal from speaker SS j is sent respectively to the corresponding speaker HP j to be transformed into sound waves.
- the coefficients G 1 , j , MF to G N , j , MF define, for each loudspeaker, the linear combination produced for the mid frequencies.
- the respective values of the coefficients G 1 , j , MF to G N , j , MF determine the main broadcast zones of each channel, as will be seen in several examples below.
- the processing unit 20 does not include the frequency selector 26.
- This variant is adapted to cases where the channels S i directly provide a signal proportional to the common bass component SS LF , and signals proportional to the other signals S i , MF and possible high frequency signals S i , HF .
- the specific components SS j , MF being particular to at least two, or even each speaker HP j , it is created for a listener 50, not only a lateralization of the perceived sound, but also an effect of depth, as will appear in the examples below.
- Chassis 5 is very compact and simple to build. Thus, the acoustic system 1 gives an impression of depth of sound to the listener, while remaining simple and easy to implement.
- the HP j speakers receive the same common bass component SS LF and they are arranged regularly angularly around the Z axis, the mechanical vibrations linked to the diffusion of bass sound waves (of frequencies lower than f1 ) by each of the speakers have a mechanical result that is substantially zero, which prevents the chassis 5 from moving due to vibrations on a support such as a table or a shelf.
- MF is located in a range of average sound frequencies higher than the frequency f1, the differentiation between loudspeakers for these frequencies do not create significant mechanical vibrations which could cause the chassis 5 to move relative to a support
- acoustic system 100 is similar to the acoustic system 1 shown on the figures 1 to 3 , similar items bear the same reference numerals and will not be described again. Only the differences and specificities will be described in detail below.
- the source 24 is a stereo source.
- the channels S i include a left channel L and a right channel R.
- the number M of speakers is equal to two, the speakers HP j comprising a first speaker HP 1 receiving a first speaker signal SS 1 , and a second speaker HP 2 receiving a second signal from SS 2 speaker.
- the HP 1 and HP 2 speakers are mounted at 180° to each other around the Z axis.
- the listener 50 is optimally located at 90° to the axes D1, D2.
- the speaker HP 1 diffuses the medium frequency sound waves L MF mainly in a zone 102 centered on the direction D1.
- the speaker HP 2 diffuses the medium frequency sound waves R MF mainly in a zone 104 centered on the direction D2.
- acoustic system 110 With reference to figures 1 And 5 , we describe an acoustic system 110 according to a second embodiment of the invention.
- the acoustic system 110 is similar to the acoustic system 1 shown on the figures 1 to 3 . Only the differences and specificities will be described in detail below.
- the source 24 is also a stereo source, the channels S i comprising a left channel L and a right channel R.
- the number M of HP j speakers is equal to three, the HP j speakers comprising a first HP speaker 1 receiving a first signal from speaker SS 1 , a second HP speaker 2 receiving a second signal speaker SS 2 , and a third speaker HP 3 receiving a third speaker signal SS 3 .
- the HP 1 , HP 2 and HP 3 speakers are mounted at 120° successively relative to each other around the Z axis.
- the listener 50 is optimally located in the extension of axis D1 from chassis 5.
- the speakers HP 1 and HP 2 diffuse the medium frequency sound waves L MF mainly in a zone 112 extending angularly between the axes D1 and D2 and a little beyond.
- the speakers HP 1 and HP 3 diffuse the medium frequency sound waves R MF mainly in a zone 114 extending angularly between the axes D1 and D3 and a little beyond.
- the 120° speaker arrangement and their differentiation on the frequencies of the MF range allows a depth sound effect with only three speakers and two channels.
- acoustic system 120 is similar to the acoustic system 1 shown on the figures 1 to 3 . Only the differences and specificities will be described in detail below.
- the source 24 is for example a Dolby 5.1 source comprising five channels S 1 to S 5 and a channel S 6 devoid of audio frequencies higher than the first frequency f1.
- S 1 is a left channel
- S 2 is a right channel
- S 3 is a center channel
- S 4 is a left side and rear surround
- S 5 is a right side and rear surround
- Se is a low frequency effects channel.
- the number M of HP j speakers is equal to three and the speakers and the listener 50 are arranged as for the acoustic system 110.
- the left channel S1 is broadcast mainly in a zone 122 of axis L, the right channel S 2 according to a zone 124 of axis R, and the center channel S 3 in a zone 126 of axis D1.
- the left side and rear surround S 4 and the right side and rear surround S 5 are broadcast mainly in zones 128, 130 respectively of SL and SR axes.
- the low frequency effects channel is not affected by differentiation.
- the 120° speaker arrangement and their differentiation on the frequencies of the MF range allows an effect of depth of sound with only three speakers.
- acoustic system 130 is similar to the acoustic system 1 shown on the figures 1 to 3 . Only the differences and specificities will be described in detail below.
- the source 24 is similar to that of the acoustic system 120 (six channels).
- the number M of loudspeakers is equal to four, the four HP j loudspeakers being mounted at 90° successively relative to each other around the Z axis.
- the listener 50 is ideally placed according to a bisector of axes D1 and D2.
- the speakers HP 1 and HP 3 diffuse the sound waves of medium frequency L MF mainly in a zone 132 having two lobes along the axis D1
- the speakers HP 2 and HP 4 diffuse the sound waves of medium frequency R MF mainly in a zone 134 presenting two lobes along the axis D2.
- the 90° speaker arrangement and their differentiation on the frequencies of the MF range allows an effect of depth of sound with four speakers and only two channels.
- acoustic system 140 is similar to the acoustic system 1 shown on the figures 1 to 3 . Only the differences and specificities will be described in detail below.
- the source 24 is similar to that of the acoustic system 120 described above (six-channel Dolby 5.1).
- the number M of HP j speakers is equal to four, the four HP j speakers being mounted at 90° successively relative to each other around the Z axis.
- the listener 50 is ideally placed along axis D1.
- the left channel S1 is broadcast mainly in a zone 122 of axis L, the right channel S 2 according to a zone 124 of axis R, and the center channel S 3 in a zone 126 d axis D1.
- the left side and rear surround S 4 and the right side and rear surround S 5 are broadcast mainly in zones 128, 130 respectively of SL and SR axes.
- the low frequency effects channel is not affected by differentiation.
- the 90° speaker arrangement and their differentiation on the frequencies of the MF range allows an effect of depth of sound with only four speakers.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- General Health & Medical Sciences (AREA)
- Stereophonic System (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Stereophonic Arrangements (AREA)
Description
La présente invention concerne un système acoustique adapté pour diffuser du son à partir de N canaux (Si) comportant des fréquences audio, N étant supérieur ou égal à deux, le système acoustique comprenant :
- un châssis,
- M haut-parleurs (HPj) structurellement analogues les uns aux autres et montés sur le châssis, M étant supérieur ou égal à deux, et
- une unité de traitement adaptée pour envoyer M signaux de haut-parleur (SSj) respectivement aux haut-parleurs (HPj).
- a chassis,
- M loudspeakers (HP j ) structurally analogous to each other and mounted on the chassis, M being greater than or equal to two, and
- a processing unit adapted to send M loudspeaker signals (SS j ) respectively to the loudspeakers (HP j ).
L'invention concerne également un procédé correspondant.The invention also relates to a corresponding method.
On connaît des systèmes acoustiques adaptés pour diffuser du son en stéréophonie, plus communément appelée stéréo, à partir de deux canaux, gauche et droit, diffusés respectivement par deux haut-parleurs en général dirigés sensiblement parallèlement vers un auditeur une telle technique vise à reconstituer une répartition dans l'espace des sources sonores, comme si l'auditeur se trouvait, par exemple, en face d'un orchestre.We know of acoustic systems adapted to broadcast sound in stereophony, more commonly called stereo, from two channels, left and right, broadcast respectively by two loudspeakers generally directed substantially parallel towards a listener such a technique aims to reconstitute a spatial distribution of sound sources, as if the listener were, for example, in front of an orchestra.
Il est également connu de diffuser du son à partir d'un plus grand nombre de canaux et d'un nombre égal de haut-parleurs, plus ou moins isolés et répartis autour d'un auditeur. Le format multicanal 5.1 comporte six canaux sonores :
- un canal gauche (abrégé « L » de l'anglais left) destiné à être diffusé par un haut-parleur situé en avant de l'auditeur, à gauche,
- un canal droit (abrégé « R » de l'anglais right) destiné à être diffusé par un haut-parleur situé en avant, à droite,
- un canal centre (« C » de l'anglais center) diffusé par un haut-parleur normalement situé entre les haut-parleurs gauche et droit,
- un canal à effet « surround » gauche (« SL » de l'anglais surround left) diffusé en général par un haut-parleur situé à gauche derrière l'auditeur,
- un canal « surround » droit (« SR » de l'anglais surround right) diffusé par un haut-parleur situé derrière l'auditeur à droite, et
- un canal pour les effets à basse fréquence (« LSE » de l'anglais low frequency effect) diffusé par un haut-parleur connu sous nom anglais de subwoofer et adapté à la diffusion des basses fréquences du spectre audio.
- a left channel (abbreviated “L” from English left ) intended to be broadcast by a loudspeaker located in front of the listener, on the left,
- a right channel (abbreviated “R” from the English right ) intended to be broadcast by a loudspeaker located in front, on the right,
- a center channel (“C” from English center ) broadcast by a speaker normally located between the left and right speakers,
- a left “surround” effect channel (“SL” from English surround left ) generally broadcast by a loudspeaker located on the left behind the listener,
- a right “surround” channel (“SR” from English surround right ) broadcast by a loudspeaker located behind the listener on the right, and
- a channel for low frequency effects (“LSE” from English low frequency effect ) broadcast by a speaker known as a subwoofer and adapted to the diffusion of low frequencies of the audio spectrum.
Les systèmes stéréo à deux haut-parleurs donnent satisfaction et sont appréciés pour leur simplicité. Toutefois, ils manquent parfois de profondeur. En effet, l'auditeur est capable d'isoler la provenance des sons dans une direction gauche-droite, mais pas ou peu dans une direction perpendiculaire et sensiblement horizontale matérialisant la profondeur. Ainsi, ce système ne permet pas de distinguer les sons provenant par exemple de l'arrière ou du devant d'un orchestre.Two-speaker stereo systems are satisfactory and appreciated for their simplicity. However, they sometimes lack depth. Indeed, the listener is able to isolate the origin of sounds in a left-right direction, but not or little in a perpendicular and substantially horizontal direction materializing the depth. Thus, this system does not make it possible to distinguish sounds coming, for example, from the back or from the front of an orchestra.
Les systèmes ayant un plus grand nombre de canaux, tels que le 5.1 mentionné ci-dessus, permettent d'obtenir un effet de profondeur, mais nécessitent une mise en place et un branchement d'un grand nombre de haut-parleurs dispersés autour de l'auditeur.Systems with a larger number of channels, such as the 5.1 mentioned above, achieve a depth effect, but require setting up and connecting a large number of speakers scattered around the 'listener.
Un but de l'invention est donc de fournir un système acoustique tel que décrit ci-dessus, et donnant l'impression de profondeur du son à l'auditeur, tout en restant simple et facile à mettre en oeuvre.An aim of the invention is therefore to provide an acoustic system as described above, and giving the impression of depth of sound to the listener, while remaining simple and easy to implement.
A cet effet, l'invention est définie par un système acoustique selon la revendication 1.For this purpose, the invention is defined by an acoustic system according to
Selon des modes particuliers de réalisation, le système acoustique comprend l'une ou plusieurs des caractéristiques correspondant aux revendications 2 à 9, prise(s) selon toutes les combinaisons techniquement possibles.According to particular embodiments, the acoustic system comprises one or more of the characteristics corresponding to
L'invention est également définie par un procédé selon la revendication 10.The invention is also defined by a method according to
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :
- la
figure 1 est une vue schématique générique d'un système acoustique selon l'invention, - la
figure 2 est une vue schématique de sélecteur de fréquences du système acoustique représenté sur lafigure 1 , - la
figure 3 est une vue schématique du répartiteur du système acoustique représenté sur lafigure 1 , - la
figure 4 est une vue schématique de dessus illustrant un système acoustique selon un premier mode de réalisation de l'invention à deux canaux et deux haut-parleurs, - la
figure 5 est une vue schématique de dessus d'un système acoustique selon un deuxième mode de réalisation de l'invention à trois haut-parleurs et deux canaux, - la
figure 6 est une vue schématique de dessus d'un système acoustique selon un troisième mode de réalisation de l'invention à trois haut-parleurs et six canaux, - la
figure 7 est une vue de dessus schématique illustrant un système acoustique selon un quatrième mode de réalisation de l'invention à quatre haut-parleurs et deux canaux, et - la
figure 8 est une vue schématique de dessus du système acoustique selon un cinquième mode de réalisation de l'invention à quatre haut-parleurs et six canaux.
- there
figure 1 is a generic schematic view of an acoustic system according to the invention, - there
figure 2 is a schematic view of the frequency selector of the acoustic system shown on thefigure 1 , - there
Figure 3 is a schematic view of the acoustic system distributor shown on thefigure 1 , - there
Figure 4 is a schematic top view illustrating an acoustic system according to a first embodiment of the invention with two channels and two speakers, - there
figure 5 is a schematic top view of an acoustic system according to a second embodiment of the invention with three speakers and two channels, - there
Figure 6 is a schematic top view of an acoustic system according to a third embodiment of the invention with three speakers and six channels, - there
Figure 7 is a schematic top view illustrating an acoustic system according to a fourth embodiment of the invention with four speakers and two channels, and - there
figure 8 is a schematic top view of the acoustic system according to a fifth embodiment of the invention with four speakers and six channels.
En référence aux
Dans l'invention, M est supérieur ou égal à deux. Dans l'exemple représenté sur la
Selon des modes de réalisation particuliers représentés sur les
Selon des modes de réalisation particuliers représentés respectivement sur les
En variante (non représentée), M est strictement supérieur à 4.As a variant (not shown), M is strictly greater than 4.
Le châssis 5 forme avantageusement un caisson définissant des ouvertures 12 dans lesquelles sont montés les haut-parleurs HP1, HP2, HP3. Le châssis 5 a par exemple une forme circulaire en vue selon un axe Z sensiblement vertical.The
Les haut-parleurs HPj sont montés de manière à diffuser du son de façon centrifuge par rapport à l'axe Z. Les haut-parleurs HPj définissent des axes Dj, c'est à dire D1, D2, D3 dans l'exemple. Les haut-parleurs HPj sont disposés de manière à ce que les axes Dj de deux haut-parleurs successifs forment un angle α sensiblement égal à 360° divisé par M, c'est-à-dire 120° dans l'exemple représenté.The HP j speakers are mounted so as to diffuse sound centrifugally with respect to the Z axis. The HP j speakers define axes D j , that is to say D1, D2, D3 in the example. The HP j speakers are arranged so that the axes D j of two successive speakers form an angle α substantially equal to 360° divided by M , that is to say 120° in the example shown .
Les haut-parleurs HPj sont structurellement analogues les uns aux autres.HP j speakers are structurally analogous to each other.
Les haut-parleurs HPj sont par exemple situés à une même distance E1 de l'axe Z. Avantageusement, l'ensemble formé par les haut-parleurs HPj tient dans une sphère 14 ayant un diamètre E2 avantageusement inférieur à 1 m.The HP j speakers are for example located at the same distance E1 from the Z axis. Advantageously, the assembly formed by the HP j speakers fits in a
L'électronique de traitement 10 comprend une unité de traitement 20 adaptée pour préparer les M signaux de haut-parleur SSj à partir des N canaux Sl. Dans l'exemple représenté, l'électronique de traitement 10 comprend un connecteur 22 adapté pour être connecté à une source 24 de signaux numériques SN, telle qu'un téléphone portable, un ordinateur personnel ou une source internet, et un convertisseur 25 pour convertir les signaux numériques SN en les canaux Sl.The
En variante, le convertisseur 25 est absent, si la source 24 délivre directement les canaux Si.Alternatively, the
L'électronique de traitement 10 se situe avantageusement dans le châssis 5 (bien que représentée à l'extérieur sur la
En variante (non représentée), l'électronique de traitement 10 comprend un lecteur (non représenté) de fichiers sonores enregistrés par exemple sur des compact-disques.As a variant (not shown), the
Selon une autre variante encore, l'électronique de traitement 10 comprend une mémoire contenant des fichiers sonores aptes à être lus et convertis par le convertisseur 25 en signaux analogiques.According to yet another variant, the
L'unité de traitement 20 comporte un sélecteur de fréquences 26 adapté pour extraire des signaux à partir de chaque canal Si, et un répartiteur 28 configuré pour former les signaux de haut-parleur SSj à partir des signaux extraits.The
Comme visible sur la
La première fréquence f1 est, par exemple, supérieure ou égale à 200 Hz et inférieure ou égale à 500 Hz.The first frequency f1 is, for example, greater than or equal to 200 Hz and less than or equal to 500 Hz.
Le sélecteur de fréquences 26 est également adapté pour extraire un signal de haute fréquence Si,HF dans lequel les fréquences audio du canal Si inférieures à une deuxième fréquence f2 sont réduites, la deuxième fréquence f2 étant supérieure à la première fréquence f1. Le sélecteur de fréquences 26 est adapté pour que, dans chacun des autres signaux Si,MF, les fréquences audio supérieures à la deuxième fréquence f2 soient également réduites.The
La deuxième fréquence f2 est, par exemple, supérieure ou égale à 1000 Hz, de préférence 3000 Hz, et inférieure ou égale à 10000 Hz, de préférence 4000 Hz.The second frequency f2 is, for example, greater than or equal to 1000 Hz, preferably 3000 Hz, and less than or equal to 10000 Hz, preferably 4000 Hz.
Par exemple, pour chaque canal Si, le sélecteur de fréquences 26 comprend un filtre passe-bas 30i de fréquence de coupure f1 pour extraire les signaux de basse fréquence Si, LF, un filtre passe-bande 32i ayant comme fréquences de coupure f1 et f2 pour extraire les autres signaux Si,MF et enfin un filtre passe-haut 34i ayant une fréquence de coupure f2 pour obtenir le signal de haute fréquence Si,HF.For example, for each channel Si, the
Dans les signaux de basse fréquence Si,LF, les fréquences audio supérieures à la fréquence f1 sont d'autant plus réduites que le filtre passe-bas 30i est efficace.In the low frequency signals S i , LF , the audio frequencies higher than the frequency f1 are reduced all the more as the low pass filter 30 i is effective.
De même, dans les autres signaux Si,MF, les fréquences audio inférieures à f1 et supérieures à f2 sont d'autant plus réduites que le filtre passe-bande 32i est efficace et, dans les signaux de haute fréquence Si,HF, les fréquences audio inférieures à la fréquence f2 sont d'autant plus réduites que le filtre passe-haut 34i est efficace.Likewise, in the other signals Si, MF , the audio frequencies lower than f1 and higher than f2 are all the more reduced as the
En référence à la
Le répartiteur 28 comprend aussi, pour chaque haut-parleur HPj, N multiplieurs 401,j à 40N,j pour multiplier les autres signaux S1,MF à SN,MF respectivement par des coefficients G1,j,MF à GN,j,MF, et un deuxième sommateur 42j pour sommer les signaux multipliés obtenus et obtenir une composante spécifique SSj,MF.The
Le répartiteur 28 comprend avantageusement un troisième sommateur 44 pour sommer les éventuelles signaux de haute fréquence S1,HF à SN,HF, et un multiplieur 46 pour multiplier la somme par un coefficient GHF et obtenir une composante aiguë commune SSHF.The
Le répartiteur 28 comprend enfin, pour chaque haut-parleur HPj, un quatrième sommateur 48j pour sommer la composante grave commune SSLF, la composante spécifique SSj,MF et la composante aiguë commune SSHF et obtenir le signal de haut-parleur SSj.The
Le fonctionnement du système acoustique 1 se déduit facilement de sa structure, c'est pourquoi il va être décrit brièvement ci-après, et ensuite pour des modes de réalisation particuliers en référence aux
La source 24 est connectée au connecteur 22 auquel elle envoie les signaux numériques SN reçus par le convertisseur 25. Ce dernier convertit les signaux numériques SN en les N canaux Si.The
Comme visible sur la
Les signaux de basse fréquence Si,LF, les autres signaux Si,MF et les signaux de haute fréquence Si,HF sont envoyés au répartiteur 28 qui en réalise des combinaisons linaires pour former les signaux de haut-parleur SSj.The low frequency signals S i , LF , the other signals S i , MF and the high frequency signals S i , HF are sent to the
La composante grave commune SSLF est, comme son nom l'indique, commune à tous les haut-parleurs et vaut GLF * (S1,LF + ... + SN,LF).The common bass component SS LF is, as its name indicates, common to all loudspeakers and is worth G LF * (S 1,LF + ... + S N,LF ).
La composante aiguë commune SSHF est, comme son nom l'indique, commune à tous les haut-parleurs HPj et vaut GHF * (S1,HF + ... + SN,HF).The common acute component SS HF is, as its name indicates, common to all HP j loudspeakers and is worth G HF * (S 1,HF + ... + S N,HF ).
La composante spécifique SSj,MF est particulière à chaque haut-parleur et vaut G1,j,MF * S1,MF + ... + GN,j,MF * SN,MF.The specific component SS j , MF is particular to each loudspeaker and is worth G 1,j , MF * S 1,MF + ... + G N,j , MF * S N,MF .
Au moins deux des composantes spécifiques SSj,MF sont différentes l'une de l'autre. Ceci permet notamment un effet de latéralisation.At least two of the specific components SS j , MF are different from each other. This allows in particular a lateralization effect.
Pour chacun des haut-parleurs HPj, le sommateur 48j fait la somme la somme de la composante grave commune SSLF, de la composante aiguë commune SSHF, et de la composante spécifique SSj,MF pour obtenir le signal de haut-parleur SSj.For each of the loudspeakers HP j , the
Chaque signal de haut-parleur SSj est envoyé respectivement au haut-parleur HPj correspondant pour être transformé en ondes sonores.Each signal from speaker SS j is sent respectively to the corresponding speaker HP j to be transformed into sound waves.
Les coefficients G1,j,MF à GN,j,MF définissent, pour chaque haut-parleur, la combinaison linéaire réalisée pour les moyennes fréquences. Les valeurs respectives des coefficients G1,j,MF à GN,j,MF déterminent des zones de diffusion principales de chaque canal, comme on le verra dans plusieurs exemples ci-après.The coefficients G 1 , j , MF to G N , j , MF define, for each loudspeaker, the linear combination produced for the mid frequencies. The respective values of the coefficients G 1 , j , MF to G N , j , MF determine the main broadcast zones of each channel, as will be seen in several examples below.
En variante, l'unité de traitement 20 ne comprend pas le sélecteur de fréquences 26. Cette variante est adaptée aux cas où les canaux Si fournissent directement un signal proportionnel à la composante grave commune SSLF, et des signaux proportionnels aux autres signaux Si,MF et aux éventuels signaux de haute fréquence Si,HF.Alternatively, the
Grâce aux caractéristiques décrites ci-dessus, les composantes spécifiques SSj,MF étant particulières à au moins deux, voire chaque haut-parleur HPj, il se créé pour un auditeur 50, non seulement une latéralisation du son perçu, mais également un effet de profondeur, comme cela apparaîtra dans les exemples ci-dessous.Thanks to the characteristics described above, the specific components SS j , MF being particular to at least two, or even each speaker HP j , it is created for a
Le châssis 5 est très compact et simple à construire. Ainsi, le système acoustique 1 donne une impression de profondeur du son à l'auditeur, tout en restant simple et facile à mettre en oeuvre.
En particulier, comme les haut-parleurs HPj reçoivent la même composante grave commune SSLF et qu'ils sont disposés régulièrement angulairement autour de l'axe Z, les vibrations mécaniques liées à la diffusion des ondes sonores graves (de fréquences inférieure à f1) par chacun des haut-parleurs ont une résultante mécanique sensiblement nulle, ce qui évite que le châssis 5 ne se déplace à cause des vibrations sur un support tel qu'une table ou une étagère.In particular, as the HP j speakers receive the same common bass component SS LF and they are arranged regularly angularly around the Z axis, the mechanical vibrations linked to the diffusion of bass sound waves (of frequencies lower than f1 ) by each of the speakers have a mechanical result that is substantially zero, which prevents the
Comme la composante spécifique SSj,MF se situe dans une gamme de fréquences sonores moyenne supérieure à la fréquence f1, la différenciation entre haut-parleurs pour ces fréquences ne crée pas de vibrations mécaniques conséquentes pouvant entraîner un déplacement du châssis 5 par rapport à un supportLike the specific component SS j , MF is located in a range of average sound frequencies higher than the frequency f1, the differentiation between loudspeakers for these frequencies do not create significant mechanical vibrations which could cause the
Le fait que la composante aiguë commune SSHF soit commune à tous les haut-parleurs HPj ne nuit pas à l'effet de profondeur, car les ondes sonores relativement aiguës (de fréquence supérieure à la fréquence f2) ne sont pas de nature à créer un effet de profondeur ou de latéralisation.The fact that the common acute component SS HF is common to all HP j loudspeakers does not harm the depth effect, because relatively high sound waves (of frequency higher than frequency f2) are not likely to create an effect of depth or lateralization.
Grâce à un traitement différencié concernant seulement les ondes sonores intermédiaires dans l'exemple (entre les fréquences f1 et f2), un effet de profondeur est obtenu de manière simple et en limitant les vibrations mécaniques par un traitement indifférencié des fréquences graves (inférieures à la fréquence f1).Thanks to a differentiated treatment concerning only the intermediate sound waves in the example (between the frequencies f1 and f2), a depth effect is obtained in a simple manner and by limiting the mechanical vibrations by an undifferentiated treatment of the bass frequencies (lower than the frequency f1).
En référence aux
Dans le système acoustique 100, la source 24 est une source stéréo. Les canaux Si comportent un canal gauche L et un canal droit R.In the
Le nombre M de haut-parleurs est égal à deux, les haut-parleurs HPj comportant un premier haut-parleur HP1 recevant un premier signal de haut-parleur SS1, et un deuxième haut-parleur HP2 recevant un deuxième signal de haut-parleur SS2. Les haut-parleurs HP1 et HP2 sont montés à 180° l'un par rapport à l'autre autour de l'axe Z.The number M of speakers is equal to two, the speakers HP j comprising a first speaker HP 1 receiving a first speaker signal SS 1 , and a second speaker HP 2 receiving a second signal from SS 2 speaker. The HP 1 and HP 2 speakers are mounted at 180° to each other around the Z axis.
L'auditeur 50 se situe de manière optimale à 90° par rapport aux axes D1, D2.The
Le répartiteur 28 est configuré pour que :
- LLF étant le signal de basse fréquence du canal gauche L,
- LMF étant l'autre signal du canal gauche L,
- LHF étant le signal de haute fréquence du canal gauche L,
- RLF étant le signal de basse fréquence du canal droit R,
- RMF étant l'autre signal du canal droit R,
- RHF étant le signal de haute fréquence du canal droit R,
- a étant un coefficient de proportionnalité.
- L LF being the low frequency signal of the left channel L,
- L MF being the other signal of the left channel L,
- L HF being the high frequency signal of the left channel L,
- R LF being the low frequency signal of the right channel R,
- R MF being the other signal of the right channel R,
- R HF being the high frequency signal of the right channel R,
- a being a coefficient of proportionality.
Ainsi, le haut-parleur HP1 diffuse les ondes sonores de moyenne fréquence LMF principalement dans une zone 102 centrée sur la direction D1. Le haut-parleur HP2 diffuse les ondes sonores de moyenne fréquence RMF principalement dans une zone 104 centrée sur la direction D2.Thus, the speaker HP 1 diffuses the medium frequency sound waves L MF mainly in a
La disposition des haut-parleurs à 180° et leur différenciation sur les fréquences de la gamme MF permet un effet de profondeur du son avec seulement deux haut-parleurs. La profondeur est symbolisée sur les
En référence aux
Dans le système acoustique 110, la source 24 est également une source stéréo, les canaux Si comportant un canal gauche L et un canal droit R.In the
Le nombre M de haut-parleurs HPj est égal à trois, les haut-parleurs HPj comportant un premier haut-parleur HP1 recevant un premier signal de haut-parleur SS1, un deuxième haut-parleur HP2 recevant un deuxième signal de haut-parleur SS2, et un troisième haut-parleur HP3 recevant un troisième signal de haut-parleur SS3. Les haut-parleurs HP1, HP2 et HP3 sont montés à 120° successivement l'un par rapport à l'autre autour de l'axe Z.The number M of HP j speakers is equal to three, the HP j speakers comprising a first HP speaker 1 receiving a first signal from speaker SS 1 , a second HP speaker 2 receiving a second signal speaker SS 2 , and a third speaker HP 3 receiving a third speaker signal SS 3 . The HP 1 , HP 2 and HP 3 speakers are mounted at 120° successively relative to each other around the Z axis.
L'auditeur 50 se situe de manière optimale dans le prolongement de l'axe D1 à partir du châssis 5.The
Le répartiteur 28 est configuré pour que :
- LLF étant le signal de basse fréquence du canal gauche L,
- LMF étant l'autre signal du canal gauche L,
- LHF étant le signal de haute fréquence du canal gauche L,
- RLF étant le signal de basse fréquence du canal droit R,
- RMF étant l'autre signal du canal droit R,
- RHF étant le signal de haute fréquence du canal droit R,
- a étant un coefficient de proportionnalité.
- L LF being the low frequency signal of the left channel L,
- L MF being the other signal of the left channel L,
- L HF being the high frequency signal of the left channel L,
- R LF being the low frequency signal of the right channel R,
- R MF being the other signal of the right channel R,
- R HF being the high frequency signal of the right channel R,
- a being a coefficient of proportionality.
Ainsi, les haut-parleurs HP1 et HP2 diffusent les ondes sonores de moyenne fréquence LMF principalement dans une zone 112 s'étendant angulairement entre les axes D1 et D2 et un peu au-delà. Les haut-parleurs HP1 et HP3 diffusent les ondes sonores de moyenne fréquence RMF principalement dans une zone 114 s'étendant angulairement entre les axes D1 et D3 et un peu au-delà.Thus, the speakers HP 1 and HP 2 diffuse the medium frequency sound waves L MF mainly in a
La disposition des haut-parleurs à 120° et leur différenciation sur les fréquences de la gamme MF permet un effet de profondeur du son avec seulement trois haut-parleurs et deux canaux.The 120° speaker arrangement and their differentiation on the frequencies of the MF range allows a depth sound effect with only three speakers and two channels.
En référence aux
Dans le système acoustique 120, la source 24 est par exemple une source Dolby 5.1 comportant cinq canaux S1 à S5 et un canal S6 dépourvu de fréquences audio supérieures à la première fréquence f1.In the
Par exemple, S1 est un canal gauche, S2 un canal droit, S3 un canal centre, S4 un surround latéral et arrière gauche, S5 un surround latéral et arrière droit, et Se un canal d'effets à basse fréquence.For example, S 1 is a left channel, S 2 is a right channel, S 3 is a center channel, S 4 is a left side and rear surround , S 5 is a right side and rear surround , and Se is a low frequency effects channel. .
Le nombre M de haut-parleurs HPj est égal à trois et les hauts parleurs et l'auditeur 50 sont disposés comme pour le système acoustique 110.The number M of HP j speakers is equal to three and the speakers and the
Le répartiteur 28 est configuré pour que :
- S1,LF à S6,LF étant les signaux de basse fréquence des canaux S1 à S6, avec S6,LF = S6,
- S1,MF à S6,MF étant les autres signaux des canaux S1 à S6,
- S1,HF à S6,HF étant les signaux de haute fréquence des canaux S1 à S6,
- a étant un coefficient de proportionnalité.
- S 1 , LF to S 6,LF being the low frequency signals of channels S 1 to S 6 , with S 6 , LF = S 6 ,
- S 1 , MF to S 6, MF being the other signals of channels S 1 to S 6 ,
- S 1,HF to S 6,HF being the high frequency signals of channels S 1 to S 6 ,
- a being a coefficient of proportionality.
Ainsi, pour la gamme de fréquences MF, le canal gauche S1 est diffusé principalement dans une zone 122 d'axe L, le canal droit S2 selon une zone 124 d'axe R, et le canal centre S3 dans une zone 126 d'axe D1. Le surround latéral et arrière gauche S4 et le surround latéral et arrière droit S5 sont diffusés principalement dans des zones 128, 130 respectivement d'axes SL et SR. Le canal d'effets à basse fréquence n'est pas concerné par la différenciation.Thus, for the MF frequency range, the left channel S1 is broadcast mainly in a
La disposition des haut-parleurs à 120° et leur différenciation sur les fréquences de la gamme MF permet un effet de profondeur du son avec seulement trois haut-parleurs.The 120° speaker arrangement and their differentiation on the frequencies of the MF range allows an effect of depth of sound with only three speakers.
En référence aux
Dans le système acoustique 130, la source 24 est analogue à celle du système acoustique 120 (six canaux).In the
Le nombre M de haut-parleurs est égal à quatre, les quatre haut-parleurs HPj étant montés à 90° successivement l'un par rapport à l'autre autour de l'axe Z. L'auditeur 50 est idéalement placé selon une bissectrice des axes D1 et D2.The number M of loudspeakers is equal to four, the four HP j loudspeakers being mounted at 90° successively relative to each other around the Z axis. The
Le répartiteur 28 est configuré pour que :
- LLF étant le signal de basse fréquence du canal gauche L,
- LMF étant l'autre signal du canal gauche L,
- LHF étant le signal de haute fréquence du canal gauche L,
- RLF étant le signal de basse fréquence du canal droit R,
- RMF étant l'autre signal du canal droit R,
- RHF étant le signal de haute fréquence du canal droit R,
- a étant un coefficient de proportionnalité.
- L LF being the low frequency signal of the left channel L,
- L MF being the other signal of the left channel L,
- L HF being the high frequency signal of the left channel L,
- R LF being the low frequency signal of the right channel R,
- R MF being the other signal of the right channel R,
- R HF being the high frequency signal of the right channel R,
- a being a coefficient of proportionality.
Ainsi, les haut-parleurs HP1 et HP3 diffusent les ondes sonores de moyenne fréquence LMF principalement dans une zone 132 présentant deux lobes selon l'axe D1, et les haut-parleurs HP2 et HP4 diffusent les ondes sonores de moyenne fréquence RMF principalement dans une zone 134 présentant deux lobes selon l'axe D2.Thus, the speakers HP 1 and HP 3 diffuse the sound waves of medium frequency L MF mainly in a
La disposition des haut-parleurs à 90° et leur différenciation sur les fréquences de la gamme MF permet un effet de profondeur du son avec quatre haut-parleurs et seulement deux canaux.The 90° speaker arrangement and their differentiation on the frequencies of the MF range allows an effect of depth of sound with four speakers and only two channels.
En référence aux
Dans le système acoustique 140, la source 24 est analogue à celle du système acoustique 120 décrit plus haut (Dolby 5.1 à six canaux).In the
Le nombre M de haut-parleurs HPj est égal à quatre, les quatre haut-parleurs HPj étant montés à 90° successivement l'un par rapport à l'autre autour de l'axe Z. L'auditeur 50 est idéalement placé selon l'axe D1.The number M of HP j speakers is equal to four, the four HP j speakers being mounted at 90° successively relative to each other around the Z axis. The
Le répartiteur 28 est adapté pour que :
- S1,LF à S6,LF étant les signaux de basse fréquence des canaux S1 à S6, avec S6,LF = S6,
- S1,MF à S6,MF étant les autres signaux des canaux S1 à S6,
- S1,HF à S6,HF étant les signaux de haute fréquence des canaux S1 à S6,
- a étant un coefficient de proportionnalité.
- S 1 , LF to S 6 , LF being the low frequency signals of channels S 1 to S 6 , with S 6 , LF = S 6 ,
- S 1 , MF to S 6, MF being the other signals of channels S 1 to S 6 ,
- S 1,HF to S 6,HF being the high frequency signals of channels S 1 to S 6 ,
- a being a coefficient of proportionality.
Ainsi, pour la gamme de fréquences MF, le canal gauche S1 est diffusé principalement dans une zone 122 d'axe L, le canal droit S2 selon une zone 124 d'axe R, et le canal centre S3 dans une zone 126 d'axe D1. Le surround latéral et arrière gauche S4 et le surround latéral et arrière droit S5 sont diffusés principalement dans des zones 128, 130 respectivement d'axes SL et SR. Le canal d'effets à basse fréquence n'est pas concerné par la différenciation.Thus, for the MF frequency range, the left channel S1 is broadcast mainly in a
La disposition des haut-parleurs à 90° et leur différenciation sur les fréquences de la gamme MF permet un effet de profondeur du son avec seulement quatre haut-parleurs.The 90° speaker arrangement and their differentiation on the frequencies of the MF range allows an effect of depth of sound with only four speakers.
Claims (10)
- An acoustic system (1; 100; 110; 120; 130; 140) designed for diffusing sound from N channels (Si) comprising audio frequencies, N being greater than or equal to two, the acoustic system (1; 100; 110; 120; 130; 140) comprising:- a frame (5),- M loudspeakers (HPj) structurally similar to each other and mounted on the frame (5), M being greater than or equal to two, the loudspeakers (HPj) defining axes (Dj), and- a processing unit (20) designed for sending M loudspeaker signals (SSj) to the respective loudspeakers (HPj),- the loudspeakers (HPj) being arranged at an angle about an axis (Z) intended to be substantially vertical, the axes (Dj) of two successive loudspeakers (HPj) forming an angle (α) substantially equal to 360° divided by M,- the processing unit (20) comprising a splitter (28) configured to produce the loudspeaker signals (SSj),each loudspeaker signal (SSj) comprising a same shared bass component (SSLF) obtained from at least one of the channels (Si), and in which the audio frequencies that are higher than a predetermined first frequency (f1) are non-existent or reduced,at least two of the loudspeaker signals (SSj) further comprising a specific component (SSj,MF) in addition to the shared bass component (SSLF), each specific component (SSj,MF) being obtained from at least one of the channels (Si), and in which the audio frequencies below the first frequency (f1) are non-existent or reduced,at least two of the specific components (SSj, MF) being different from each other,the acoustic system (1; 100; 110; 120; 130; 140) further comprising a frequency selector (26) adapted to produce, from each channel (Si), on the one hand a low frequency signal (Si,LF) in which the audio frequencies of the channel (Si) higher than the first frequency (f1) are non-existent or reduced, and on the other hand, if said channel (Si) comprises audio frequencies that are higher than the first frequency (f1), at least one other signal (Si, MF) in which the audio frequencies of the channel (Si) lower than the first frequency (f1) are non-existent or reduced,the shared bass component (SSLF) being proportional to the sum of the low frequency signals (Si,LF),the specific components (SSj, MF) being obtained from the other signals (Si,MF),characterized in that the frequency selector (26) is further configured to extract, from each respective channel (Si) comprising audio frequencies that are higher than a predetermined second frequency (f2), a high-frequency signal (Si, HF) in which the audio frequencies of said channel (Si) lower than the second frequency (f2) are non-existent or reduced, the second frequency (f2) being higher than the first frequency (f1), the frequency selector (26) being configured so that, in each of the other signals (Si,MF), the audio frequencies that are higher than the second frequency (f2) are non-existent or reduced, andat least one, preferably all, of the loudspeaker signals (SSj) formed by the splitter (28) further comprising a shared high frequency component (SSHF) proportional to the sum of the high frequency signals (Si,HF), the shared high frequency component (SSHF) being added to the shared bass component (SSLF).
- The acoustic system (1; 100; 110; 120; 130; 140) according to claim 1, wherein the first frequency (f1) is greater than or equal to 200 Hz and less than or equal to 500 Hz.
- The acoustic system (1; 100; 110; 120; 130; 140) according to claim 1 or 2, wherein the specific components (SSj,MF) are linear combinations of at least some of the other signals (Si,MF).
- The acoustic system (1; 100; 110; 120; 130; 140) according to any one of claims 1 to 3, wherein the second frequency (f2) is greater than or equal to 1000 Hz and less than or equal to 10000 Hz.
- The acoustic system (100) according to any one of claims 1 to 4, wherein:- the acoustic system (100) is designed for diffusing the sound from a stereo source (24), the channels (Si) comprising a left channel L and a right channel R;- the number M of loudspeakers (HPj) is equal to two, the loudspeakers (HPj) comprising a first loudspeaker HP1 receiving a first loudspeaker signal SS1; and a second loudspeaker HP2 receiving a second loudspeaker signal SS2; and- the splitter is configured so that:LLF being the low frequency signal of the left channel L,LMF being the other signal of the left channel L,LHF being the high frequency signal of the left channel L,RLF being the low frequency signal of the right channel R,RMF being the other signal of the right channel R,RHF being the high frequency signal of the right channel R,a being a proportionality coefficient.
- The acoustic system (110) according to any one of claims 1 to 4, wherein:- the acoustic system (110) is designed for diffusing the sound from a stereo source (24), the channels (Si) comprising a left channel L and a right channel R;- the number M of loudspeakers (HPj) is equal to three, the loudspeakers (HPj) comprising a first loudspeaker HP1 receiving a first loudspeaker signal SS1, a second loudspeaker HP2 receiving a second loudspeaker signal SS2, and a third loudspeaker HP3 receiving a third loudspeaker signal SS3; and- the splitter (28) is configured so that:LLF being the low frequency signal of the left channel L,LMF being the other signal of the left channel L,LHF being the high frequency signal of the left channel L,RLF being the low frequency signal of the right channel R,RMF being the other signal of the right channel R,RHF being the high frequency signal of the right channel R,a being a proportionality coefficient.
- The acoustic system (120) according to any one of claims 1 to 4, wherein:- the acoustic system (120) is designed for diffusing the sound from a source (24) with five channels S1 to S5 and one channel S6 with no audio frequencies that are higher than the first frequency (f1);- the number M of loudspeakers (HPj) is three, the loudspeakers (HPj) including a first loudspeaker HP1 receiving a first loudspeaker signal SS1, a second loudspeaker HP2 receiving a second loudspeaker signal SS2, and a third loudspeaker HP3 receiving a third loudspeaker signal SS3; and- the splitter (28) is configured so that:S1,LF to S6,LF being the low frequency signals of channels S1 to S6, with S6,LF = Se,S1,MF to S6,MF being the other signals of channels S1 to Se,S1,HF to S6,HF being the high frequency signals of channels S1 to Se,a being a proportionality coefficient.
- The acoustic system (130) according to any one of claims 1 to 4, wherein:- the acoustic system (130) is designed for diffusing the sound from a stereo source (24), the channels (Si) comprising a left channel L and a right channel R;- the number M of loudspeakers (HPj) is equal to four, the loudspeakers (HPj) comprising a first loudspeaker HP1 receiving a first loudspeaker signal SS1, a second loudspeaker HP2 receiving a second loudspeaker signal SS2, a third loudspeaker HP3 receiving a third loudspeaker signal SS3, and a fourth loudspeaker HP4 receiving a fourth loudspeaker signal SS4; and- the splitter (28) is configured so that:LLF being the low frequency signal of the left channel L,LMF being the other signal of the left channel L,LHF being the high frequency signal of the left channel L,RLF being the low frequency signal of the right channel R,RMF being the other signal of the right channel R,RHF being the high frequency signal of the right channel R,a being a proportionality coefficient.
- The acoustic system (140) according to any one of claims 1 to 4, wherein:- the acoustic system (140) is designed for diffusing the sound from a source (24) with five channels S1 to S5 and one channel S6 with no audio frequencies that are higher than the first frequency (f1);- the number M of loudspeakers (HPj) is equal to four, the loudspeakers (HPj) including a first loudspeaker HP1 receiving a first loudspeaker signal SS1, a second loudspeaker HP2 receiving a second loudspeaker signal SS2, a third loudspeaker HP3 receiving a third loudspeaker signal SS3, and a fourth loudspeaker HP4 receiving a fourth loudspeaker signal SS4; and- the splitter (28) is adapted such that:and SSHF = 1/4 * (S1,HF + S2,HF + S3,HF + S4,HF + S5,HF + S5,LF),S1,LF to S6,LF being the low frequency signals of channels S1 to S6, with S6,LF=S6,S1,MF to S6,MF being the other signals of channels S1 to Se,S1,HF to S6,HF being the high frequency signals of channels S1 to Se,a being a proportionality coefficient.
- A method for diffusing sound from N channels (Si) comprising audio frequencies, N being greater than or equal to two, the method comprising the following steps:- providing M loudspeakers (HPj) structurally similar to each other and mounted on a same frame (5), M being greater than or equal to two, the loudspeakers (HPj) defining axes (Dj) and being arranged at an angle around an axis (Z) intended to be substantially vertical, the axes (Dj) of two successive loudspeakers (HPj) forming an angle (α) substantially equal to 360° divided by M,- sending, by a processing unit (20), M loudspeaker signals (SSj) respectively to the loudspeakers (HPj),- generating the loudspeaker signals (SSj) by a splitter (28) of the processing unit (20),each loudspeaker signal (SSj) produced having a shared bass component (SSLF) obtained from at least one of the channels (Si), and in which audio frequencies that are higher than a predetermined first frequency (f1) are non-existent or reduced,at least two of the loudspeaker signals (SSj) further comprising a specific component (SSj,MF) in addition to the shared bass component (SSLF), each specific component (SSj,MF) being obtained from at least one of the channels (Si), and in which audio frequencies below the first frequency (f1) are non-existent or reduced,at least two of the specific components (SSj, MF) being different from each other,- selecting frequencies in order to produce, from each channel (Si), on the one hand a low frequency signal (Si,LF) in which the audio frequencies of the channel (Si) higher than the first frequency (f1) are non-existent or reduced, and on the other hand, if said channel (Si) comprises audio frequencies that are higher than the first frequency (f1), at least one other signal (Si, MF) in which the audio frequencies of the channel (Si) lower than the first frequency (f1) are non-existent or reduced, the shared bass component (SSLF) being proportional to the sum of the low frequency signals (Si,LF), the specific components (SSj, MF) being obtained from the other signals (Si,MF), and
characterized by the following steps:- extracting, by the frequency selector (26), from each respective channel (Si) comprising audio frequencies that are higher than a predetermined second frequency (f2), a high-frequency signal (Si, HF) in which the audio frequencies of said channel (Si) lower than the second frequency (f2) are non-existent or reduced, the second frequency (f2) being higher than the first frequency (f1), the frequency selector (26) being configured so that, in each of the other signals (Si,MF), the audio frequencies that are higher than the second frequency (f2) are non-existent or reduced, and at least one, preferably all, of the loudspeaker signals (SSj) formed by the splitter (28) further comprising a shared high frequency component (SSHF) proportional to the sum of the high frequency signals (Si,HF), the shared high frequency component (SSHF) being added to the shared bass component (SSLF).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1859338A FR3087077B1 (en) | 2018-10-09 | 2018-10-09 | SPACE EFFECT ACOUSTIC SYSTEM |
PCT/EP2019/077296 WO2020074553A1 (en) | 2018-10-09 | 2019-10-09 | Acoustic system with spatial effect |
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Publication Number | Publication Date |
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EP3864859A1 EP3864859A1 (en) | 2021-08-18 |
EP3864859B1 true EP3864859B1 (en) | 2023-10-04 |
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EP19783045.8A Active EP3864859B1 (en) | 2018-10-09 | 2019-10-09 | Acoustic system with spatial effect |
Country Status (7)
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US (1) | US11451917B2 (en) |
EP (1) | EP3864859B1 (en) |
JP (1) | JP7501961B2 (en) |
KR (1) | KR20210070989A (en) |
CN (1) | CN112840672B (en) |
FR (1) | FR3087077B1 (en) |
WO (1) | WO2020074553A1 (en) |
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JP4289343B2 (en) | 2005-10-20 | 2009-07-01 | ヤマハ株式会社 | Speaker drive device |
US10848867B2 (en) * | 2006-02-07 | 2020-11-24 | Bongiovi Acoustics Llc | System and method for digital signal processing |
GB0821327D0 (en) * | 2008-11-21 | 2008-12-31 | Airsound Llp | Apparatus for reproduction of sound |
US8638951B2 (en) * | 2010-07-15 | 2014-01-28 | Motorola Mobility Llc | Electronic apparatus for generating modified wideband audio signals based on two or more wideband microphone signals |
EP2596649B1 (en) * | 2010-07-22 | 2015-09-09 | Koninklijke Philips N.V. | System and method for sound reproduction |
US9197963B1 (en) * | 2013-05-28 | 2015-11-24 | Audio Design Experts, Inc. | Broad sound field loudspeaker system |
US9288601B2 (en) * | 2013-05-28 | 2016-03-15 | Audio Design Experts, Inc. | Broad sound loudspeaker system |
KR101772397B1 (en) * | 2016-04-05 | 2017-08-29 | 래드손(주) | Audio output controlling method based on orientation of audio output apparatus and audio output apparatus for controlling audio output based on orientation |
US10405125B2 (en) * | 2016-09-30 | 2019-09-03 | Apple Inc. | Spatial audio rendering for beamforming loudspeaker array |
CN107071634B (en) * | 2017-03-03 | 2023-11-10 | Gn听力公司 | Signal processing device, method and loudspeaker |
CN107333206B (en) * | 2017-06-12 | 2023-11-07 | 歌尔股份有限公司 | Integral sound box and control method thereof |
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2018
- 2018-10-09 FR FR1859338A patent/FR3087077B1/en active Active
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2019
- 2019-10-09 EP EP19783045.8A patent/EP3864859B1/en active Active
- 2019-10-09 US US17/283,349 patent/US11451917B2/en active Active
- 2019-10-09 CN CN201980067777.0A patent/CN112840672B/en active Active
- 2019-10-09 WO PCT/EP2019/077296 patent/WO2020074553A1/en unknown
- 2019-10-09 JP JP2021519640A patent/JP7501961B2/en active Active
- 2019-10-09 KR KR1020217009582A patent/KR20210070989A/en not_active Application Discontinuation
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FR3087077A1 (en) | 2020-04-10 |
EP3864859A1 (en) | 2021-08-18 |
FR3087077B1 (en) | 2022-01-21 |
KR20210070989A (en) | 2021-06-15 |
US11451917B2 (en) | 2022-09-20 |
CN112840672A (en) | 2021-05-25 |
WO2020074553A1 (en) | 2020-04-16 |
JP2022504565A (en) | 2022-01-13 |
CN112840672B (en) | 2022-08-09 |
JP7501961B2 (en) | 2024-06-18 |
US20220007125A1 (en) | 2022-01-06 |
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