CN1266604A

CN1266604A - Sound radiating devices

Info

Publication number: CN1266604A
Application number: CN98807982A
Authority: CN
Inventors: 格雷厄姆·班克; 亨利·阿齐马; 马丁·科洛姆斯; 尼尔·哈里斯
Original assignee: New Transducers Ltd
Current assignee: NVF Tech Ltd
Priority date: 1997-08-05
Filing date: 1998-07-30
Publication date: 2000-09-13
Also published as: BR9811836A; PL338378A1; SK1632000A3; EP1002445A1; YU5400A; TR200000351T2; EA200000195A1; NO20000588D0; EA002176B1; AU8551998A; AR013281A1; BG104072A; IL133985A0; NZ501959A; MXPA00001277A; AU741154B2; TW392415B; CA2295724A1; ZA986927B; KR20010022624A

Abstract

Sound radiator has an areally distributed array of plural acoustic transducers having individual drive means. A large number of transducers can be used and can be of any type. Drive signals produce phase-different sound radiations from the transducers in distributions over the area of the array having desired diffuse or particularly voiced nature. Drive signal producing means involves phase-shifting higher acoustic frequency content, and is further operative for in-phase action of at least some of the transducers in sub-area(s) of the array for lower frequency content.

Description

Sound radiating devices

The present invention relates to a kind of audio unit, particularly relate to response from the electronic signal of suitable electronic audio signal processing unit and produce and launch the device of sound, relate in particular to a kind of loud speaker of novelty.

Conventional loudspeakers relies on piston action, utilizes by the barrier film that back and forth drives basically in the calutron sound is reached in the surrounding air, acts on the diffuser (cone) of air typically on demand in inner and front.The feature of this conventional loudspeakers is: have the box-type shell of labyrinth usually, be used for absorbing in the back those otherwise can be to small part and the anti-phase counteracting sound component of propagating forward of required sound component; The required sound of propagating forward is along the directivity of effectively listening to the acoustic beam angle, and the acoustic beam angle is narrow more, and the frequency of the related sound of generation is just high more; The intensity of sound that in this acoustic beam angle, produces along with distance by square law decay, just as if the sound that sends from point sound source such, near this sound source, then sound density is very high, can be used as supersound projector.As everybody knows, multiple unit cone formula loud speaker has different cone sizes, be used for producing low, in and the high pitch frequency band, therefore the electronics crossover network of signal need be provided for these unit.

Recently, we have developed various forms of audio units, comprise the loud speaker of brand-new pattern, and particularly sound effect and synthetic acoustic radiation is referring to PCT application GB 96/02145.The bending wave of the position excitation of particular provisions in the panel that appropriate configuration and shape are arranged is depended in the related sound effect of this loud speaker, this panel can with non-form in the form of piston basically with synthetic surface vibration acoustical coupling in air.Synthetic audio emission removed above-mentioned prior art intrinsic short range sound equipment and direction characteristic, and single panel unit has the frequency range of non-constant width effectively from the whole front panel surface and produce the height diffuse effect on the angular range of non-constant width.The geometry of this panel and stiffness characteristics are with the design attitude of activator device, help to reach the disseminating of resonance frequency mode of surface vibration effect, so that promote the big diffusion sound of directivity scope, have higher definition and accuracy, form sharp contrast with the loud speaker of existing piston effect and be better than the loud speaker of existing piston effect.The loud speaker of existing piston effect often has inconvenient restriction (may be more remarkable to stereosonic generation) to the good position of listening to, cause the acoustic beam angle to narrow down inevitably, and always make us square attenuating that uncomfortable high short range sound causes point sound source inevitably.In addition, be exclusively used in the different units of medium-high frequency section in the prior art and need crossover network to cause burden, but also need in the housing of box-shaped, carry out absorbing of complicated sound component in the back.

The present invention draws by the sound equipment advantage feature of continuous distribution pattern face equipment is considered three.The advantage that has been found that synthetic scattering emission sound further expands to sound senior synthetic of emission, both relevant for a plurality of this panel-form loudspeakers in the same space (with the wavelength correlation interference), also relevant for reflecting effect from this spatial edge, as wall and/or ceiling and/or floor (and standing wave is interfered), also relevant for low sense sense of hearing place and/or insertion (intrusiveness) effect, therefore balance and/or mutual incoherent preferably, and about as around the central authorities of devices such as home theater, before, stereo or multichannel smooth in public speech occasion usually in back.This consideration at first and the most natural care and to gaze at focus be to be fit to any situation that the vibration of mode of resonance in bending wave retaining plate and/or the excitation at this plate is propagated better.Yet, this many purposes and aspect, adopted diverse basis by basic reproduction assessment, specifically, basic contribution about the above-mentioned diffuse nature of audio emission, and how useful to advantageously reaching different audio emission effect, no matter whether simulate the sound that the loud speaker from the distribution pattern bending wave action sends effectively.The result who occurs at different aspect of the present invention is regarded as the more diverse method of representative below.

Method has the effective phase coherence of obvious characteristic from piston type exemplary tapered loudspeaker sound, and irrelevant from the relevant phase place of the characteristic of the non-piston type distribution pattern plate loudspeaker sound that relies on ongoing ripple effect.

According to an aspect of the present invention, one sound radiating devices comprises a plurality of area distribution arrays with independent sound transducer unit that excites driver or exciting bank, and the audio emission that its drive signal can cause phase place to have nothing in common with each other, it is directly related input phase to this drive signal, all emission sound about the direction that produces useful scattering from described array region and/or want, and do not have the narrow acoustic beam angle and the frequency of increase, be fit to the synthetic of independent unit output.Can expect that the suitable unordered or incoherent relation of described phase place can be applied to low to 20 or still less paramount to 750 or higher transducer unit array.

We believe that it is useful mentioning known electrostatic loudspeaker at this, compare with cone formula loud speaker, relatively large audio emission zone is to be made of independent piston action formula zone effectively, these subregions cooperate with careful phase shift of arranging, therefore the point source directivity of homophase that loud speaker is shown can perceive and emission sound has the difference of essence with the scheme in this proposition.

Aspect referring to the invention described above, produce the irrelevant directivity and the short range sound equipment that has improved conventional loudspeakers of required phase place of a plurality of unit of overall emission sound diffusion sensation, but the inevitable similar features of the feature that this feature is not above-mentioned distribution pattern bending wave plate to be taken place.In fact, pursue the similar characteristics of the region-type distribution aspect of this plate resonance frequency mode, the operating frequency that may relate to matching unit distribution and transducer unit the most in essence is relevant.Yet, for the plate that depends on bending wave action in the top PCT application, the area distribution of mode of resonance vibration is complicated and inhomogeneous at interval, and find that broadband filter provides complete audio signal and/or frequency distributed to the unit individually on the principle and the transducer unit of the different modes that comprise is not attractive, at least allowing to use the transducer regular array to compare with the preferred embodiment of the present invention is so, then all the more so if not all frequency response abilities of each unit.This preferred implementation method has also been avoided the inevitably restriction uniformly of the active mode of resonance surface distributed of bending wave action plate, can more flatly propagate, and can be independent of the geometry and the rigidity of this plate requirement.

For preferred diffusion emission sound, with respect to the suitable distribution of the single transducer unit of whole array, compare with general relevant film-type conventional loudspeakers (comprising above-mentioned electrostatic), show no sequence characteristics.With the PHASE DISTRIBUTION that it is suitable herein that the available pseudorandom number generator and/or the table of random numbers are intended to get rid of high same meaning regular and/or that assemble can be considered to randomization.About their phase difference, should be avoided neutralization effect independent and/or accumulation easily, for example, be 180 ° integer approximate number or divisor and easily realize by being constrained to neither one.Yet should be understood that self-evident is to also have all possibilities, and any concrete out of phase distribution that is considered to satisfy any concrete transducer unit array in order to simplify, can be made into or be seen as fixing or regulation usually for relevant embodiment.And, it is identical with the number of transducer unit that the number of out of phase does not need, and more promptly may be identical as long as the number of out of phase and distribution produce the acceptable diffusion overall sound that can perceive, and this situation is, possibility is many more, and many more unit are just arranged in the related array.

The work of carrying out at present shows, this specific embodiment can reach roughly and the comparable audio work scope of continuous bend ripple action plate loud speaker, and is better than the latter at emission sound frequency and sensation diffusion sound effect aspect smooth-going.In addition, can also be easily processed than bass, though some difficulty.Therefore, under restriction, can handle effectively the low-limit frequency of related array sizes practicality, similar previous piston type loud speaker, only, on the promptly relevant basically basis, the corresponding driving signal is applied to all transducer units by on the homophase basis.Certainly, it no longer is a problem that final front-to-back ratio plays previous a large amount of low frequency cone formula woofer, in fact, is accepted well because of non-directivity.This low frequency driven in phase pattern can be applied to and be less than all transducer units of array, promptly only use to the unit of array subregion, as the subregion at the normally center of centre along with frequency rises via low-frequency range, dwindle gradually, usually the form that jumps by level can be handled by out of phase pattern at random well and be lower than above-mentioned scope.

Be appreciated that, the drive signal of delivering to the independent sound transducer unit of array is carried out Phase Processing has represented synthetic required emission sound effect aspect very general and machine-processed easily, constituted the present invention on the other hand, but needn't be limited to the relevant basically and incoherent combination of audio frequency different frequency bands operation, also be not restricted to the subregion or the zonule of the contiguous whole array region of related transducer unit, promptly may also can find the form of beneficial effect by other styles, as annular or dihedral.

Further find, The amplitude processing to the drive signal of delivering to the independent sound transducer of array unit has useful effect in the sensation overall sound direction of being launched by array, and the area distribution of the various amplitude of this transducer unit drive signal constitutes another aspect of the present invention, no matter whether follow above-mentioned preferred PHASE DISTRIBUTION.

Operation referring to the array sound transducer unit of regular phase mode, stimulated replacement above whole or partly in-phase mode also be feasible, particularly the string of tensioning vibration or vibration of thin membrane any wants direction, and the polylinker delay line can be used in and be input to each unit; And/or the single for this reason secondary recurrence of bending wave vibration all-pass filter can be used in each unit, feasible ground, the crossover frequencies different to the mode switch of each unit.Certainly other this generic operation pattern also is fine, and the availability of two or more orderly and/or unordered basically phase places and/or amplitude operator scheme has constituted another aspect of the present invention.

About practical structure, separately the array of transducer unit preferably has common thin slice or plate carrier device, and it can be for flexibility or hard, and its surface that provides needs not to be the plane, promptly can be one or multi-directional bending and/or facet is arranged.In order to help the manufacturing of little transducer unit array, preferred carrier device can further help drive signal to be applied to this transducer unit separately on demand, easily as the matrix of an associated conductor pattern, for example after the good mode of setting up of printed circuit board (PCB).In fact, this carrier device can also be used for the local drive signal circuit of installed module formula semiconductor integrated circuit type.Certainly, this carrier device further influence is to promote to reach desirable overall sound emitting surface, and this surface shows basically vibration at random, at the synthetic required low or minimum same phase constituent that has.This situation can reach acceptable degree, and the phase place of audio emission is effect not, and regardless of frequency, directivity is all than conventional piston formula loud speaker lower (or direction is wideer), and has the power with frequency feature more uniformly that distributes.

So just produced useful effect, and need not to seek coupling, comprised undersized, the required formula of the cone efficiently piston type diaphragm block of the present practicality of concrete use the situation of the actual generation of continuous slab loud speaker.Suitably the order of magnitude of unit is to have only about 10 millimeters diameter and have the momentum (comparing with family expenses cone loudspeaker actual design) that is low to moderate 5%-10%, for example each transducer unit approximately is 50 milligrams, it is so far owing to the reproduction well beyond low-quality sound has not been considered to feasible, but in fact has great benefit for herein purpose, reason is that these unit are very little, and the audio emission pattern that has shows spherical polytropism more significantly than axis propagation characteristic.

The more development of junior unit, no matter be that electrodynamic type comprises moving-coil electromagnetic type or other patterns such as crystal or polymerization piezoelectricity, electret or other comprise the application that is called micron or nanometer engineering mechanical technique, in case relevant interest is evoked, just can expect the natural evolution of technology, so anyway, can remarkably expect and extend favourable application of the present invention.In fact, clearly and very essential be, the unit is more little, then quantity is many more, benefit is just big more, particularly along with as low cost integrated circuit drive signal device and high power capacity, high performance signal processing apparatus, comprising that numerical data is handled and the development arranged side by side of computer pattern, is the line development that the small any affairs of representative surmount semiconductor and computer science and technology if believe.

Special transducer unit will according to Power Processing, bandwidth and maximum pressure level characteristic and some needs be selected and design.If array has fewer purpose transducer unit, line drives and to be used for the module amplifier installation, semiconductor integrated circuit such as CMOS for example, and to reach the D/A that is used for the digital processing signal be feasible.From the resistance sum total of low bit capacity decoder is feasible.If array has plurality purpose transducer unit, then expect seeking help from other technologies naturally more than the unit for for example about 750, drive loud speaker such as relevant Direct Digital, this loud speaker relies on human ear's integration character at least in part.

Getable Digital Signal Processing has higher computing capability, uses Digital Signal Processing can easily handle audio emission synthetic of any desirable characteristics, comprises and receives directivity of wanting rather than the diffuse nature of above mentioning earlier.The composite signal coding can easily merge the message composition and follow phase place and amplitude function any and that all array energy transducer unit are wanted, has avoided for example unwanted transmission between complete 0 and complete 1 sequence.

Again referring to transducer unit, can manage it/row addressing and time and line multiplex coding in local drives and array carrier device and part, with the processing signals of responding digitalization, need or want if in a plurality of coats of metal, have, carrier device can have the printed-circuit path that is used for addressing.In addition, utilize the semiconductor circuit development technique, Jian Duan lithography technique especially, transducer unit can also be formed in the carrier device or on; And as what above at first point out, the unit may be electrostatic, thin or thick film piezoelectric type, or rely on very for a short time the device of little engineering machinery fabrication techniques with movable part, therefore can be applied to moving coil and lever auxiliary electrical moving cell typically as using high efficiency rubidium permanent magnet and being operated in the outside polarization field.The piezoelectric type material that is fit to comprises the crystal formula, for example, and ba titanate or high polymeric electret; And the multilayer transducer unit utilizes layer printing technology common in the semiconductor technology to make together at an easy rate.The size of transducer unit the best is that each is below 20 millimeters.Aforesaid most advanced and sophisticated lithography technique can also be applied to carrier devices such as fexible film, and these films itself have the sound transformation, and have a plurality of honeycomb activation points, and these positions connect suitably electrical connection in a matrix array.

The embodiment that realizes the above-mentioned each side of the present invention is described with reference to the accompanying drawings by way of example, wherein:

Figure 1A and 1B are front plan views and the edge top views that the diagrammatic illustration plate is installed the first matrix form rectangular array of moving-coil type transducer unit;

Fig. 2 A and 2B are the second similar views of circular array roughly that plate is installed the moving-coil type transducer unit;

Fig. 3 A and 3B are similar views than large matrix formula rectangular array of plate moving-coil type transducer unit;

Fig. 4 A and 4B are the similar views that thin slice or film are installed 10 * 10 arrays of piezoelectric transducer unit;

Fig. 5 A and 5B show the transducer unit position that the coat of metal by piezoelectric type thin slice of selecting or film forms similarly;

Fig. 6 A-6D shows the specific embodiment of dynamo-electric form of film;

Fig. 7 is the summary square circuit diagram according to the application multi-channel sound system of the embodiment of the invention;

Fig. 8 is the summary description calcspar of an array loud speaker out-phase and the operation of low frequency homophase;

Fig. 9 similarly further shows the low frequency option; And

Figure 10 utilizes the schematic circuit diagram that Digital Signal Processing is implemented in programmed computer system.

Among Fig. 1,2 and 3, what illustrate is the

support plate

11,21 and 31 of hard traditionally or rigidity, its structure is not to implement the preferred version of bending wave action distributed resonance loud speaker discussed above (seeing the applicant's PCT application GB 96/02145), have moving-

coil type transducer

12,22 and 32 above, its cone passes in the array hole in self-explantory mode.Transducer unit 12 and 32 is matrix form 5 * 5 and 20 * 20 rectangular arrays, is that 6X and outer ring are the circular array of 12X and transducer unit 22 is inner ring or centre circles around relevant central location.If want or have a preference for, the array of essentially rectangular can have more or less row and/or row and row to equate with row transducer unit number or not wait, perhaps comprise binary system index, between these cell row and the row or be adjacent staggered relation between row and the row, for example staggered half pitch or part interleave are with the density of increase plate one-element group; The array of circular can first lap and second circle have different numbers transducer unit and/the more transducer unit of multi-turn maybe can be arranged, each circle has practical relation; And other arrays and/or outside gradually transducer unit part interleave are feasible, for example simple or staggered continuous triangle or polygon, or comprise the complex form of these distribution forms combination, or even can satisfy or change the irregular type of cell density.

Fig. 4 and 5 respectively shows carrier sheet or

film

41 and 51, is the rectangular array of the matrix form 10 * 10 of

transducer unit

42 and 52, and the capable and 1-10 row of a-j are arranged, and each unit marks is a1-j10.Transducer unit 42 is the single piezo-electric types that are fixed on thin slice or the film 41, transducer unit 52 also is a piezoelectric type, is that coat of metal 52A and the 52B by the apparent surface's alignment that is essentially piezoelectric (for example for high polymer type) of thin slice or film 51 forms and limit.Also can make similar changes in distribution to situation about summarizing above.Yet, can expect the row consistent/row addressing with unit marks, each group row preface and row preface add in the electric conductor (not shown) corresponding one, further please see hereinafter about Digital Signal Processing.

Fig. 6 A-6D diagram use dielectric film 63 be used as forward and backward each hole fixed

head

64F, 64B between the application of mobile sound diaphragm.This electromechanics film apparatus sounding principle is known in the art, comprises use itself conduction or the fixed head of conductive coating is arranged, and have the plural layers of reverse charged layer, and these layers selectively metallising have or each side metallising of layer has conductive electrode.In the fixed head apparent surface, form as the chamber of alignment recess 65F, 65B, make film 63 produce the local deformation (and do not adopt the scheme of magnetic texure varied in thickness, this so far scheme is less to the influence of loud speaker usually) of effective sounding.Recess 65A, 65B are shown as circle or dome in Fig. 6 C, be sharp especially pyramid in Fig. 6 A, B.

Zone

tabular electrode member

62F, 62B are presented at the positive and negative both sides of the common electret thin slice 63 that is positioned at each part, chamber, have the purpose that independent conducting path 66F, 66B are used for independent excitation.

Fig. 1-6 has omitted the driving amplifier for each transducer unit T (referring to indicating A in the accompanying drawing after a while) that can expect, it can be the semiconductor integrated circuit formula, can be contained in easily on the

carrier

11,21,31,41,51,63, below for example being installed in, or be installed on the following printed circuit board (PCB), the connector pin that for example matches with electroplating hole, electroplating hole links to each other with amplifier, and through the power supply of the electric conduction routing in one or more flash coatings.

Fig. 7 is presented at the sound equipment sound system of a multichannel environment, it comprises electron source 100, be used for electronic audio signal is offered sound channel output 101-105, be used as such as home theater or other solids and really use around audio, comprise common left and right central preposition loud speaker and a pair of rearmounted loud speaker of adding now, in this example, 5 all loud speakers are all used array format of the present invention, specifically also usually, please, constitute by a plurality of above-mentioned transducer unit T1-Tn and the independent driving amplifier A1-An that links referring to array speaker 113.The audio signal supply line S1-Sn of the amplifier A1-An of each array speaker 111-115 shows from phase place and/or amplitude setting and output device 121-125 supply.Be appreciated that, it all is with a kind of pattern that array speaker 111-115 does not need, and does not also need the transducer unit T1-Tn of equal number, and promptly " n " may be different separately, though left and right preposition Stereoloudspeaker is normally the same, rearmounted loud speaker is also normally identical; And in any application of the present invention, loud speaker will receive the identical signal of essence, and implementing array speaker of the present invention will be by common phase place and/or amplitude adjustment apparatus suppling signal.

Fig. 8 shows the simple application of a suitable phase settings, its via from channel audio signal line 103 branches 131 to delay line 132, it has a plurality of joint D1-Dn and produces, phase change between 0 ° and 360 °, these phase change have above-mentioned correlation, be used for when correctly applying signal through illustrated randomization output circuit 133, from the synthetic diffusion sound of transducer unit T1-Tn output, randomization output circuit 133 is used for the not homophase audio signal on the line D1-Dn is connected to transducer unit drive wire S1-Sn with suitable no sequential mode.Though it is that each transducer unit T1-Tn has a unique phase place that a kind of implication is arranged, but to this example may be not need, i.e. the number of delay line joint, and these lines D1-Dn may be less than the number of transducer unit, therefore be less than drive wire S1-Sn, even be some approximate numbers.If some transducer units really receive the audio signal of same phase, so usually preferably, these signals not all are adjacent, and in fact advantageously distribute (or non-at least destruction ground) is to reach acceptable diffusion sound result, though they may be arranged in the array symmetrically.Relation for approximate number, reach acceptable diffusion sound result if be applied to the subregion or a part of power of array by itself, then related quantity is preferably enough, and the arrangement in an integral array may have this subregion closes and/or the symmetry of conversion of identical and/or different patterns contiguous with suitable, and it is equally effective to reach further practical combinations as described above.

Phase place " randomization " can be represented with following formula wholly or in part:

φ (n, m, ω)=[0,2 π) on random number wherein n and m represent group's number of transducer unit row and row, its form is a complete matrix form rectangular array or a described subregion.

Shown in the figure, channel audio signal line 10 is also through a low pass filter 135, in order to produce low frequency output, since can and with its with the homophase relational application of simulation piston type loud speaker effect to whole array, as indicated above, be directly connected to all transducer unit drive wire S1-Sn referring to filter output 136.Be appreciated that also as indicated above since line 136 on low frequency signal all do not put on the transducer unit T1-Tn that is concerned about in all array speakers, so have beneficial effect.As putting on the middle part easily, preferably resemble the subregion of the central authorities of window usually.Fig. 8 has comprised these structures, as below being described this.

Fig. 9 is different with Fig. 8 locates at first to be, there is shown only part 113a of array speaker, specifically, the interactively of the corresponding signal of the transducer unit T1-Tm of one of the whole arrays of rectangular matrix type row or delegation and transducer unit drive wire S1-Sm and a part of 132a of the delay line setting that has corresponding joint output line D1-Dm.Can be easily the other subarray that is considered as transducer unit of whole array setting, be positioned at top and/or following or the front and/or the back of transducer unit T1-Tm of the form of column or row part 113a, similarly have delay line part 132a (for example, the end-to-end serial connection of part) and have " randomization " output device 133a.

Refer now to, phase place does not have randomized low frequency supply, and shown in the figure, the output line R1-Rm part that branch is connected to randomization output 133, the specifically middle part of label RX appointment appear in the output 136 of low pass filter 135 at 137 places.If similar application is to each output of other all parts of randomization output device, then the result is with the homophase low frequency signal that receives on the branch line 137 in the middle of having only transducer unit, if but the output of the exterior portion of randomization output device is not connected to branch line 137, then the end of this band reduces, and produces " window " effect completely.Line shown in the figure 136 also is connected to another low pass filter 138 in order to the signal of low-limit frequency to be provided on online 139, be connected to all other outputs of randomization output device, therefore referring to RY1 and the RY2 of part 133a, increase low-limit frequency drove thus transducer unit quantity to complete loudspeaker array.If desired, more filter stage and array energy transducer number of unit more and/or other steps increase driven in phase can be arranged, from a minimum band or window to a maximum number, this maximum number may be littler than integral array.Additionally or alternatively, the homophase that has band pass filter and/or array subregion block of cells excites, for example, as above-mentioned, being higher than frequency low or minimum at least filtering, is the connection pattern that is connected to the randomization output device according to their output substantially.

Fig. 9 has also shown another polylinker delay line or delay line part 141a, it has low pass filter 136 output branches 142 to supply with signal, its output is connected to the output of randomization output device in regular turn, R1-Rm referring to M1-Mm and part 133a, useful effect is that the driving of phase difference and array energy transducer unit can simulate the voice output from the string or the film of tensioning.Be appreciated that other the delay line part and/or the joint output of other groups can be connected to other randomization output device output with any needs or the mode of wanting.And, Fig. 9 also demonstrates another branch 145 and comes from audio track holding wire 103, is connected to each of each a plurality of filter 146, and the transducer unit in every zone has one, all there is one up to whole arrays, referring to the extremely corresponding randomization output device output of filter output F1-Fm R1-Rm; These filters 146 are second order recurrence all-pass formula preferably, can be up to a preset frequency, it can be as crossover frequencies to the transducer unit operation of having only diffusion, and with each or gather different, be used for needed synthetic video effect, for example the vibration of simulation row ripple is as follows:

φ (n, m, ω) = k | r | = \frac{ω}{c (ω)} \sqrt{{(n - N)}^{2} + {(m - M)}^{2}}

Fig. 9 has also demonstrated additional amplitude modifier 151 and has been used for the signal that the randomization output device is exported, have only when multi-mode is activated and can works, this amplitude modifier can not work, the output 152 of coming out from node specification piece 153 has illustrated outside or frame area (153F) or corner (153C) or block of cells (153P) or awl (153T) or other (153X) effects, and degree set (153S).By the variable amplifier array with some resembles the mode (but also can by required suitable method) that above-mentioned line in groups is connected to selected output and is connected to the selection control connection on the variable amplifier at least.Useful other (153X) result's example be according to fourier transform theoretical and in conjunction with dependent phase to produce territory, far field pressure-responsive arbitrarily, to this, certainly, can provide other delay lines and/or joint.General fourier transform equation for degree p and phase place o is as follows:

p (ω, θ) = \underset{n}{Σ} \underset{m}{Σ} A (n, m, ω) \exp (jφ (n, m, ω)) \exp (jkr (n, m))

The processing of signal phase and amplitude is operated by the digital digital spc data processing of signal easily, has very big flexibility and certainty, comprises to realize equation and combination and further synthetic result's processing.Therefore, utilize the method for numeral to produce above-mentioned and other useful feature and effect, rather than adopt the analogy method among Fig. 8 and 9, especially useful.Therefore, referring to Figure 10, digital data processor 161 comprises the storage data of working storage immediately of itself and is using program data.The processor 161 that briefly shows among the figure links to each other with high capacity memory 163 through

parallel bus

162A, 162B, data that have in the memory 163 and program are relevant to the useful pattern of Phase Processing, comprise the film (163M) of randomization (163R), simulation tensioning and the ripple (163T) of going, and control according to fourier transform (163F); Also be relevant to the processing of amplitude, comprise window and/or zonule (163W/P), framework and/or corner (163F/C) and fourier transform pattern (163F); And for general and special control purpose (163C), select automatically and carry out describedly, extend and the four-headed arrow dotted line that passed stretches to and from the reference composition square of memory 163 referring to the schematic dotted line of data processor square 161 according to institute's installed software.The schematic dotted line extension that the corresponding letter of the external declaration utilization of

different mode

163F, 163R, 163T, 163F, 163W/P, 163F/C etc. inputs to I/O 165 and passes data processor square 161.The label of data input and output bus is 166A, 166B, between input/output device 165 and data processor 161, though (about

bus

162A, 162B) bus utilizes very fast data processor to use well on the basis of variable connector.

Give the input of simulated audio signal alternately and digital audio and video signals, see sound source and

sound channel

100A, 101A-105A and 100D, 101D-105D, receive

variable connector

171A, 171D respectively.The output 172 of analog multichannel switch is presented at 173 branches with in 174 place's low-pass filtering, and delivers to 175, two lines 172 of line and 175 and be connected to A/D converter (ADC) level 176, and the

parallel input bus

177 and 178 of output.Parallel Digital sound channel output 101D-105D is supposed that also line output is on input bus 177 effectively, though they can be serials, and then the output of multipath conversion converts to parallel.In fact, if data processor 161 is enough fast, can supply the loud speaker of each sound channel with serial signal, then digital audio and video signals is that tandem or walk abreast just should have been selected well.In addition, illustrated multipath conversion and ADC can be in input/output devices 165, preferably be additional under the microprocessor control of data processor 161 and finishing, may, promptly has only a low pass filter (or as above-mentioned, have a plurality of) up outside the connection (and if the conversion of the analog form in square 165 be preferably to be equivalent to Digital Signal Processing, what for to being used in digital audio), if the Digital Signal Processing of preferred equivalence, what for extremely can omit, after promptly at any time desired this converting.

Referring to each array speaker, for example refer again to part 113a, be used to have the sound transducer unit T1-Tm of relevant regional amplifier A1-Am.Independent D/A DAC1-DACm further is shown among the figure supplies with signal to described amplifier A1-Am.Though the B1-Bm of input bus branch parallel shown in the figure is connected to each A/D converter DAC1-DACm from numeral system output 181, but in enough fast numerical data processing system, can use the serial input, for example, the continuous basically analog drive signal in sound transducer unit that converts to of the content that can adopt shift register and latch register to handle latch register between the shift register load.At least at that time, and supposition provides the zone synthetic drive signal control amplifier (A1-Am), all relevant DAC and register setting is contained in or be connected in system's I/O square 165 mutually is preferred and practical, promptly have only the analog signal of single line to export regional transducer unit amplifier to.

Please note that amplifier A1-Am shown in Figure 10 is a type (G), the type of dual input AND-function specifically, so that single row/row addressing, at any time can find out down and want the transducer unit that activates, perhaps, if the synthetic work period is enough good, can access satisfied audio reproduction, then can be based on multipath conversion for the signal of different mode.As figure, the combination of row (R) and row (C) address wire comprises those that specify from input/output device 165, is connected to the open gate of diagram amplifier A1-Am.In the practice, data handling system and input/output device thereof utilize the receiving circuit on the array speaker carrier to produce the serial binary word, and periodic variation treats the row and column of addressing, do like this, and it is just very economical to connect up.

Claims

1. a sound radiating devices comprises a plurality of area distribution arrays with sound transducer of independent excitation drive unit, and produces drive signal and make the device of the different audio emission of sound transducer output phase.

2. sound radiating devices as claimed in claim 1 is characterized in that, the drive signal generation device drive signal that phase place is different is applied to described drive unit, and wherein, PHASE DISTRIBUTION makes all audio emission realize diffusion on array region.

3. sound radiating devices as claimed in claim 1 or 2 is characterized in that, the drive signal generation device drive signal that phase place is different is applied to described drive unit, and wherein, phase place is distributed on the array region disorderly, makes all audio emission irrelevant.

4. sound radiating devices as claimed in claim 1 is characterized in that, the drive signal generation device drive signal that phase place is different is applied to described drive unit, and wherein, PHASE DISTRIBUTION is simulated the required sound equipment of all audio emission.

5. as each described sound radiating devices among the claim 1-4, it is characterized in that the drive signal generation device adds out of phase the essentially identical frequency content of input signal.

6. as the described sound radiating devices of above-mentioned arbitrary claim, it is characterized in that related out of phase at random.

7. as the described sound radiating devices of above-mentioned arbitrary claim, it is characterized in that related out of phase is 180 ° integer approximate number or the number beyond the divisor.

8. as the described sound radiating devices of above-mentioned arbitrary claim, it is characterized in that, related out of phase respectively with transducer one to one, have nothing in common with each other.

9. as the described sound radiating devices of above-mentioned arbitrary claim, it is characterized in that aforesaid drive signal generation device produces the audio frequency component that is higher than on the low frequency, and the drive signal generation device makes also at least some sound transducers produce homophase audio emission.

10. sound radiating devices as claimed in claim 9 is characterized in that, described number voice transducer is the subregion of array.

11., it is characterized in that described number voice transducer is located substantially on the middle part of array as claim 9 or 10 described sound radiating devices.

12., it is characterized in that described at least some sound transducers are more as claim 9,10 or 11 described sound radiating devices, and bigger on the subregion size of corresponding described array, and related sound frequency is lower.

13. as each described sound radiating devices among the claim 9-12, it is characterized in that the drive signal generation device is connected with filter, with low-frequency component or the band that obtains input signal.

14., it is characterized in that described array has at least 20 described sound transducers as the described sound radiating devices of above-mentioned arbitrary claim.

15., it is characterized in that described array has up to 750 or more a plurality of described sound transducer as the described sound radiating devices of above-mentioned arbitrary claim.

16., it is characterized in that described sound transducer is the piston action formula as the described sound radiating devices of above-mentioned arbitrary claim.

17., it is characterized in that described sound transducer is the cone drive-type as the described sound radiating devices of above-mentioned arbitrary claim.

18., it is characterized in that described sound transducer is electrostatic as each described sound radiating devices among the claim 1-15.

19., it is characterized in that described sound transducer is a piezoelectric type as each described sound radiating devices among the claim 1-15.

20., it is characterized in that described sound transducer is dynamo-electric diaphragm type as each described sound radiating devices among the claim 1-15.

21., it is characterized in that described sound transducer connects the total carrier device of all transducers or group as the described sound radiating devices of above-mentioned arbitrary claim.