EP1800517A1 - Device and method for controlling a public address system, and a corresponding public address system - Google Patents
Device and method for controlling a public address system, and a corresponding public address systemInfo
- Publication number
- EP1800517A1 EP1800517A1 EP05801889A EP05801889A EP1800517A1 EP 1800517 A1 EP1800517 A1 EP 1800517A1 EP 05801889 A EP05801889 A EP 05801889A EP 05801889 A EP05801889 A EP 05801889A EP 1800517 A1 EP1800517 A1 EP 1800517A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wave field
- field synthesis
- loudspeaker
- sound
- array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 230000015572 biosynthetic process Effects 0.000 claims abstract description 143
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 143
- 230000005236 sound signal Effects 0.000 claims abstract description 29
- 230000004807 localization Effects 0.000 claims abstract description 8
- 238000004590 computer program Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 6
- 230000008447 perception Effects 0.000 description 15
- 238000003491 array Methods 0.000 description 11
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Classifications
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
-
- 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
- H04R2201/403—Linear arrays of transducers
-
- 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
- H04R2201/405—Non-uniform arrays of transducers or a plurality of uniform arrays with different transducer spacing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/13—Application of wave-field synthesis in stereophonic audio systems
Definitions
- the present invention relates to audio reproduction systems, and more particularly to public address systems for supplying comparatively large sound reproduction spaces.
- Typical public address systems for supplying a relatively large environment such as in a conference room on the one hand or a concert hall in a hall or even in the open air on the other hand all suffer from the problem that due to the commonly used small number of speaker channels a faithful reproduction of the sound sources anyway eliminated , But even if a left channel and a right channel are used in addition to the mono channel, you always have the problem of the level.
- the back squares ie the squares that are far from the stage, must be provided with sound just as much as the squares that are close to the stage. If z. B.
- a single monaural loudspeaker does not allow directional perception in a conference room. It only allows directional perception if the location of the loudspeaker corresponds to the direction. This is inherent in the fact that there is only one loudspeaker channel. However, even if there are two stereo channels, you can only fade between the left and right channels, so to speak, panning as it were. This may be beneficial if there is only one source. However, if there are several sources, the localization, which is only roughly possible with two stereo channels anyway, is completely impossible. You also have a sense of direction in stereo, but only in the sweet spot.
- the loudspeakers in such medium to large auditoriums which are supplied with stereo or mono mixes, are arranged above the listeners, so that they can not reproduce any direction information of the source anyway.
- support loudspeakers positioned near a source of sound are also being attempted to re-establish natural auditory location, which are usually controlled without delay, while the stereo sound is delivered through the powered speakers is delayed, so that the supporting loudspeaker is perceived first and thus according to the law of the first wavefront a localization is possible, but support loudspeakers have the problem that they are perceived as a point source, which leads on the one hand to a difference to the the actual position of the sound emitter results and that, moreover, there is the danger that everything is too loud for the front spectators, while for the rear spectators everything is too quiet.
- support speakers only allow a real direction perception when the sound source, so z.
- a speaker is located near the support speaker. This would work if a support speaker is installed in the lectern, and a speaker is always on the lectern, and in this playback room it is impossible that somebody stands next to the lectern and plays something for the audience.
- support loudspeakers usually use conventional loudspeakers, which in turn have the acoustic properties of a point source-just as the supply loudspeakers-resulting in an excessive level which is often perceived as unpleasant in the immediate vicinity of the systems.
- the object of the present invention is to provide a pleasant and accurate sound concept.
- a device for controlling a public address system according to claim 1 a method for controlling a public address system according to patent claim 9, a public address system according to claim 10 and a computer program according to claim 16.
- the present invention is characterized in that a wave field synthesis loudspeaker array is integrated into a typically already existing public address system in order to eliminate the problems with regard to the high sound level differences in the auditorium as well as the lack of directional perception or the wrong directional perception.
- the device for controlling a sound system with loudspeaker signals, wherein the sound system has a wave field synthesis loudspeaker array and one or more supply loudspeakers, has an audio input for obtaining the audio signal from at least one sound source, a position input for obtaining information about a position of the sound source, a wave field synthesis unit for calculating loudspeaker signals for the loudspeakers of the wave field synthesis loudspeaker array and means for supplying the loudspeaker signals for the one or more supply loudspeakers.
- the large sound supply is achieved with still existing conventional power speakers.
- the level for the front speakers due to the sound energy, which is supplied by the wave field synthesis loudspeaker array, the level for the front speakers, so they are in the front rows in the audience, can be made lower, because the front rows so now by the preferably front arranged wave field synthesis array pleasant and in particular directionally sensitive to be supplied with sound.
- the present invention provides an improvement of conventional sound systems by the additionally integrated wave field synthesis sound reinforcement by providing and controlling the additional wave field synthesis loudspeaker array.
- the present invention is advantageous in that the auditory perception of source positions is supported and enhanced. Furthermore, the concept of the invention improves the energy distribution and the perception of direction in auditoria, which will also lead to a better intelligibility of a speaker, in particular when used for conference systems.
- the present invention can also be used advantageously in the installation and event sector and in particular, of course, also for larger public address systems.
- the present invention is also advantageous in that existing hardware can be used for large-scale sound supplies. This concerns, on the one hand, the already existing audio mixing consoles and, on the other hand, the supply loudspeakers, which are typically already present and supplemented by the wave field synthesis array or the device for controlling the supply loudspeaker or the wave field synthesis array.
- the drive device according to the invention is only at the level of the normal Speaker signals of the supply speakers act to provide attenuation compared to the case without wave field synthesis array. Further, in order to exploit the law of the first wave front in this preferred embodiment, a delay is also introduced for the sound signals of the supply speakers in ranges between one and 100 milliseconds to further support directional perception.
- the drive device is transparent to the output signal of a mixer, which is typically present in such systems anyway.
- the integration of the directional wave field synthesis front array creates a pleasant sound level distribution with real directional perception, can be executed in compact hardware and creates the urgently needed additional sound supply of the often underserved or too loudly sounded first listener rows with a natural sound impression. This is of particular importance when it is taken into account that in various conference rooms or concert halls the so-called VIPs, ie the persons on whom the economic survival of the theater, etc. depends, sit in the first row, ie in the area which has been particularly problematical in the prior art, and which will particularly benefit from the inventive use of the wavefield synthesis front array.
- inventive concept is advantageous in comparison with a complete field-synthesizing system in that it can be implemented considerably less expensively, since a wave-field synthesis array is not used on four sides and thus a whole considerable effort on speakers and wiring, etc. must be driven. Instead, only a front array is used to position the virtual sources that typically occur at the front. to be able to The sweet spot of this open field synthesis array will be as large as in an entire wave field synthesis scenario if the sources are only at the front, only for sources in other directions the sweet spot is limited.
- the quality of the sound reconstruction may be reduced by means of the flat wave field synthesis front loudspeaker array.
- This is not problematical insofar as the stage will always be further away for the eye, and localization differences will be small, because the places themselves will, as it were, move closer together due to the greater distance.
- the wave-field synthesis reconstruction of a straight front array in this case thus also leads to a situation in which the reconstruction gets worse the further one is removed from the array.
- this disadvantage does not matter.
- the rear rows are taken care of by the large and powerful supply speakers, which at least make it sufficiently loud for the rear rows.
- Fig. 1 shows a preferred embodiment of a device for controlling a public address system with loudspeaker signals
- Fig. 2 shows a preferred embodiment of a public address system for a room to be supplied with sound in front of a stage.
- FIG 1 shows a device for controlling a public address system with loudspeaker signals, the public address system having a wave field synthesis loudspeaker array 10 and one or more supply loudspeakers 12 which are arranged separately from the wave field synthesis loudspeaker array 10 and in the exemplary embodiment shown in FIG for a left supply speaker, R for a right supply speaker, and M for a mono or center speaker.
- a mono speaker M may be present, or else a left speaker L or a right speaker R.
- FIG. 2 A specific arrangement of the supply loudspeakers 12 is also shown in FIG. 2, in which there are only four supply speakers 12a, 12b, 12c, 12d, the left supply loudspeakers 12c, 12d being supplied with the L channel of the stereo signal, while the right speaker 12b, 12c are supplied to the right channel of the stereo signal.
- a mono or center speaker is shown in Fig. 2 z. B. not available.
- each of the loudspeakers 12a-12d could also be supplied with the mono channel M.
- the entire room 13 to be sounded would be supplied with a mono signal radiated from the four loudspeakers.
- the wave field synthesis loudspeaker array 10 is arranged in front of a stage 11 on which are real sound sources, such as speakers, theater actors, musicians, etc., generally indicated by reference numeral 15 in FIG 2, may be located.
- the wave field synthesis loudspeaker array 10 is a flat open array. This means that the wave field synthesis loudspeaker array does not extend around all four sides of the room 13 to be supplied with sound, shown in FIG. 2 from above, but only on one side.
- This page is preferably located there with respect to the space to be supplied with sound, where the typically existing virtual / real sound sources can be. So is in a theater z. B. usually assume that the actors will be only on stage, but not laterally with respect to the audience or behind the spectators. Therefore, in order to be able to resolve these sound sources spatially, it suffices to arrange a wave field synthesis loudspeaker array on the side of the room 13 to be supplied with sound, which is opposite the stage 11 or opposite the area in which it is actually located Can stop sound sources. However, it is irrelevant whether the wave field synthesis loudspeaker array 10 is arranged between the real sound sources and the room 13 to be sounded, ie as shown in FIG. 2, or if the wave field synthesis loudspeaker array 10 is arranged behind the real sound sources, ie z. B. at a dashed position 17 shown in FIG.
- the real sound sources are mapped into virtual sound sources by the wave field synthesis unit discussed below, such that a sound field reconstructed by the wave field synthesis loudspeaker array is configured is that a listener in the room 13 to be sounded actually means that the sound sources he hears are at the real positions on the stage, in the case of the wave field synthesis loudspeaker array 10 shown in FIG. 2, behind the loudspeaker array are located.
- the scenario of FIG. 2 can be compared with a normal wave field synthesis setting to some extent, but in contrast to the normal setting, the wave field synthesis loudspeaker array 10 is arranged only on one side, namely on the Stage side, whereas in a normal wave field synthesis setting, the wave field synthesis loudspeaker array would extend at least around the entire room 13 to be sounded, and possibly even wave field synthesis loudspeaker arrays could be mounted even in the ceiling and floor.
- the drive device of FIG. 1 initially comprises an audio input 16, via which output signals from a microphone array 19 or any other audio source are supplied to an analog / digital converter 20.
- the audio input 16 will receive analog microphone signals in the scenario shown in Figure 1, where there are actually microphones.
- the audio input 16 will not receive analog output signals from a microphone array 19 but generally speaking, audio signals from at least one sound source, which may be in any form, for example in a compressed / encoded form or in the form of a sequence of samples, such as those found on a CD.
- the audio signal of at least one sound source is fed to a wave field synthesis unit 22, which additionally receives information about the current position of this sound source via a position input 24.
- the additional positioning signal may be fed to the controller rather than directly to the WFS unit.
- the sources are thus positioned on the user interface or via the positioning input.
- the current position of the previously recorded and position-determined sound source can in fact be supplied directly with the audio signal of the field-synthesizing unit 22.
- the position of the source can also be transmitted as side information of the audio signal. In this case, the audio input and the position input coincide.
- this actor will carry one of the microphones of the microphone array 19 with him and also z. B. be provided with a GPS transmitter so that its position can be currently determined.
- Other techniques for example, by infrared triangulation or by HF triangulation or by any other position determination method are known.
- the wave field synthesis unit 22 will receive, via the position input 24, at least the then naturally fixed position of all the microphones and carry out a reconstruction thereof.
- the wave field synthesis unit 22 is designed to generate loudspeaker signals for the loudspeakers of the wave field synthesis loudspeaker array based on the position obtained via the position input 24, the audio signal obtained via the audio signal input 16 and based on the position of the loudspeakers of the wave field synthesis. Calculate loudspeaker arrays so that a sound field generated by the wave field synthesis loudspeaker array allows localization of the at least one sound source by a listener.
- the down-mixed channels generated by a conventional mixer 14 such as the left channel L, the right channel R and the center channel M and mono channel M are also incorporated in the drive device according to the invention to a device for providing the loudspeaker signal to the one or more supply loudspeakers on the basis of the audio signal from the at least one sound source.
- this device may comprise the analog / digital converter 20, a delay stage 24a and an amplitude manipulation stage 24b. Both stages are driven by a control 26 preferably present in the drive device, with delay parameters relating to the delay stage 24a and gain or attenuation parameters with respect to the amplitude manipulation stage 24b.
- all supply speaker channels can be delayed or amplified by the same value or by different values.
- the controller 26 is preferably operable via a user interface 28, which will typically be a graphical user interface.
- the drive device will be provided on the output side with a digital / analog converter 30 which outputs analog output signals for the loudspeakers of the wave field synthesis loudspeaker array 10 on the one hand and loudspeaker signals for the supply loudspeakers L, R, M on the other hand in Fig. 1 denoted by 12 outputs, in which case, depending on the implementation, an additional amplifier 32 for amplifying the Lautsselerersig- will be present for the typically high-level supply speakers.
- the wave-field synthesis unit 22 is configured to provide a scalable number of wave-field synthesis channels 23.
- a loudspeaker of a wave field synthesis loudspeaker array will receive its own loudspeaker signal.
- the drive may also be such that a group of adjacent loudspeakers in the wave field synthesis loudspeaker array are driven with the same loudspeaker signal.
- the position of the wave field synthesis loudspeaker array and thus each individual loudspeaker in the wave field synthesis loudspeaker array is known and, like the position input of the sound source, is used for the wave field synthesis calculation.
- the wave field synthesis unit 22 is scalable. This means that, depending on the number of wave field synthesis loudspeaker arrays 10 connected to the wave field synthesis unit 22, it will generate a corresponding number of output channels. Requires an array z. For example, if there are ten different wave field synthesis loudspeaker signals, a second array of the same size will also require ten field synthesizer loudspeaker channels, so that when two such arrays are connected to it, the wave field synthesizer unit 22 will also provide the appropriate number of loudspeaker signals.
- each loudspeaker signal naturally also depends on the number and position of other loudspeakers or depends on whether other loudspeakers are on other positions are provided or not.
- the scalability may be formed by a sensor that detects whether, for example, a fiber optic cable for a field-effect synthesizer loudspeaker array is connected to an output of the drive device of FIG. 1 or not.
- the outputs will be labeled "first array”, "second array”, .... so that the drive device may be e.g. B. via a table access or something similar positions and number of additional arrays automatically receives.
- the number of channels / arrays of the wave field synthesis unit 22 can also be communicated via the graphical user interface 28 and the controller 26.
- the scalability is particularly valuable because anyway only an open wave field synthesis array is used, so no speaker bands around a listener room, but only on the stage side of the auditorium, so that in the case in which straight array is then placed on an already existing straight array, the positions of the other speakers particularly favorable z.
- the controller 26 is configured to drive the delay stage 24a such that the loudspeaker signals are delayed such that the wavefront due to the wave field synthesis loudspeaker array 10 is about 2 to 10 milliseconds prior to the time of a Listener arrives, to which the wave front of the supply speaker arrives.
- the law of the first sound wave front is exploited to the effect that the listener in the room initially - relatively quietly - perceives the wavefront of the wave field synthesis loudspeaker array 10 and then only the wave front of the typically louder supply speakers.
- the user will feel that the sound sources are at the positions as suggested by the wave field synthesis loudspeaker array, although the actual sound supply is through the supply speakers.
- the controller 26 driving the amplitude manipulation unit 24b to either all channels or only a few channels or signals for specific speakers by the same amount or to dampen different amounts.
- WFS Wave Field Synthesis
- Applied to the acoustics can be simulated by a large number of speakers, which are arranged side by side (a so-called speaker array), any shape of an incoming wavefront.
- a single point source to be reproduced and a linear arrangement of the speakers the audio signals of each loudspeaker have to be fed with a time delay and amplitude scaling in such a way that the radiated sound fields of the individual loudspeakers are superimposed correctly.
- the contribution to each loudspeaker is calculated separately for each source and the resulting signals are added together. If the sources to be reproduced are in a room with reflective walls, reflections must also be reproduced as additional sources via the loudspeaker array. The cost of the calculation therefore depends heavily on the number of sound sources, the reflection characteristics of the recording room and the number of speakers.
- the advantage of this technique is in particular that a natural spatial sound impression over a large area of the playback room is possible.
- the direction and distance of sound sources are reproduced very accurately.
- virtual sound sources may even be positioned between the real speaker array and the listener.
- wavefield synthesis works well for environments whose characteristics are known, irregularities occur when the texture changes or when wave field synthesis is performed based on environmental conditions that do not match the actual nature of the environment.
- An environmental condition can be described by the impulse response of the environment.
- the space compensation using wavefield synthesis would be to first determine the reflection of that wall to determine when a sound signal reflected from the wall will return to the loudspeaker and what amplitude this reflected sound signal will be Has. If the reflection from this wall is undesirable, then with the wave field synthesis it is possible to eliminate the reflection from this wall by impressing the loudspeaker with a signal of opposite amplitude to the reflection signal in addition to the original audio signal, so that the traveling compensating wave is the Reflectance wave extinguished, so that the reflection from this wall in the environment that is considered, is eliminated.
- Wave field synthesis thus enables a correct reproduction of virtual sound sources over a large reproduction range. At the same time it offers the sound engineer and sound engineer new technical and creative potential in the creation of even complex soundscapes.
- Wave field synthesis (WFS or sound field synthesis), as developed at the end of the 1980s at the TU Delft, represents a holographic approach to sound reproduction. The basis for this is the Kirchhoff-Heimholtz integral. This states that any sound fields within a closed volume can be generated by means of a distribution of monopole and dipole sound sources (loudspeaker arrays) on the surface of this volume. Details can be found in MM Boone, ENG Verheijen, PF v.
- an audio signal that emits a virtual source at a virtual position is used to calculate a synthesis signal for each loudspeaker of the loudspeaker array, the synthesis signals being designed in amplitude and phase in such a way that a wave resulting from the superimposition of the loudspeaker array individual sound wave output by the speakers existing in the loudspeaker array, corresponding to the wave that would have originated from the virtual source at the virtual position, if this virtual source at the virtual position was a real source with a real position.
- multiple virtual sources exist at different virtual locations.
- the computation of the synthesis signals is performed for each virtual source at each virtual location, typically resulting in one virtual source in multiple speaker synthesis signals. Seen from a loudspeaker, this loudspeaker thus receives several synthesis signals, which go back to different virtual sources. A superimposition of these sources, which is possible due to the linear superposition principle, then gives the reproduced signal actually emitted by the speaker.
- the final-rendered and analog-to-digital converted reproduction signals for the individual loudspeakers could be transmitted to the individual loudspeakers via two-wire lines, for example, from the wave field synthesis central unit.
- the wave field synthesis central unit could always be made only for a special reproduction room or for a reproduction with a fixed number of loudspeakers.
- a wave field synthesis-based front array 10 of FIG. 1 reproduces the recorded sound sources from the correct direction and distance, respectively, so that a source is heard where it originates. These virtual sound sources are reproduced with the shortest systemic latency. Significant sources of latency are the wave-field synthesis unit 22 and optionally the analog-to-digital converters 20 and 30, respectively.
- the main sonication reproduces conventional mono / stereo / multi-channel signals, but is delayed from the front array by a few milliseconds, with the delay in the Section 2-100 milliseconds, and preferably between 3 and 8 milliseconds.
- the main sound through the supply speakers 12 sonicates the auditorium with sufficient levels.
- the front array operates at a reduced level to obtrusively support directional perception. If the front array is optimally arranged, then a real sense of direction will result up to the rear rows, whereby a sufficient sound distribution is ensured.
- the drive device shown in FIG. 1 can be implemented as a compact audio system based on PC or DSP consisting of audio crossbar, delay unit, wave field synthesis-based real-time renderer unit, controller module and connection and operator control unit.
- the audio signals of the natural sources are conventionally provided to the summator unit or mixer 14 and the wave field synthesis rendering unit.
- the audio signals for conventional sound such as stereo, mono, 5.1, etc. are generated (14) and then delayed in a delay stage 24a accordingly.
- the amplitude between main and directional array can be adjusted.
- the individual sources in the wave field synthesis rendering unit 22 become virtual sound sources which are positioned or moved according to their actual position on the stage.
- the wave field synthesis rendering unit 22 calculates the audio signals needed for the wave field synthesis front array, thereby ensuring real direction mapping of the audio sources.
- the virtual sound sources are positioned according to the implementation, so that in this case the user interface 28 represents the position input 24 of FIG. 1, for example in the form of a pointer.
- the delay of the stage 24a as well as the level between the front array, main PA, delay line and other audio sinks are adjusted.
- the corresponding generated setups are each storable, so as not to have to be reset each time, but to be made available for later or other applications / scenarios.
- the wave field synthesis front array With regard to the placement of the wave field synthesis front array in a conventional stage environment, it is preferred to place the wave field synthesis front array at head height of the viewers or above the head height of the viewers and place them in front of the stage. Further, it is preferred to take a wavefield synthesis front array 10 that is wider than the viewer rows to avoid edge effects on the array edge.
- the inventive concept provides a real sense perception by representing virtual sound sources based on the wave field synthesis. Furthermore, no angular errors are made in the directional resolution.
- virtual sound sources can be placed where the actor stands. Movements of the actors are possible without crossfading. Static sources remain stable. The sound supply of the auditorium with a sufficient sound level is still ensured with standard systems, which means that existing hardware can be used optimally.
- the concept according to the invention does not require a closed array for supplying the listening area, since the supply can be ensured by the conventional sonication. It now results in a moderate sound level, especially in the first rows of spectators, as the sound energy is distributed. Namely, several loudspeakers of the wave field synthesis loudspeaker array always play, which results in a natural listening environment, especially in the first showy areas, where typically the persons who are responsible for the continuity of a theater / auditorium will sit and, of course, especially well supply.
- the wave field synthesis array is placed slightly above the heads of the listeners. Even higher arrangements are potentially possible here, but too high an arrangement will lead to possibly occurring mislocalizations in the vertical. However, due to psychoacoustic laws, it has been found that vertical mislocalizations are less problematic than horizontal mislocalizations. So it is not so problematic for a listener if he hears a source a bit too high, if the left / right position on the stage is exactly right.
- both loudspeaker systems are controlled either synchronously or, as has been stated, such that the wavefront of the wave field synthesis loudspeaker array is slightly ahead of the wavefront of the supply loudspeakers in the listener arrives.
- Preferred areas of application of the inventive concept are conference rooms.
- the inventive device now a location of a speaker is possible.
- Several speakers become several localizable virtual / real sound sources, which is particularly advantageous for situations in which understanding problems can exist anyway, ie when people of different nationalities talk to each other.
- a spatial separation of the individual speakers supports the acoustic understanding of all speakers, especially when several people talk at the same time.
- the concept according to the invention allows a localization of the speaker not only visually but also audibly.
- the device according to the invention can be used well, since in the stage design often no support speakers can be installed.
- the installation of a continuous loudspeaker band in the stage edge is particularly advantageous and less conspicuous.
- the functionality of the concept according to the invention namely that the sound sources can move and are accordingly acoustically moved along, is of particular advantage for theatrical applications which depend on the movement of the actors.
- the inventive concept provides a resolution of individual instruments by virtual sound sources, while still a total supply of the usual level is possible, which is particularly important for popular music concerts of high importance.
- the method according to the invention can be implemented in hardware or in software.
- the implementation may be on a digital storage medium, in particular a floppy disk or CD with electronically readable control signals, which may interact with a programmable computer system such that the method is performed.
- the invention thus also exists in a computer program product with a nem stored on a machine-readable carrier program code for performing the method according to the invention, when the computer program product runs on a computer.
- the invention can thus be realized as a computer program with a program code for carrying out the method when the computer program runs on a computer.
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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)
- Circuit For Audible Band Transducer (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Selective Calling Equipment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102004057500A DE102004057500B3 (en) | 2004-11-29 | 2004-11-29 | Device and method for controlling a sound system and public address system |
PCT/EP2005/012057 WO2006058602A1 (en) | 2004-11-29 | 2005-11-10 | Device and method for controlling a public address system, and a corresponding public address system |
Publications (2)
Publication Number | Publication Date |
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EP1800517A1 true EP1800517A1 (en) | 2007-06-27 |
EP1800517B1 EP1800517B1 (en) | 2008-08-13 |
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EP05801889A Active EP1800517B1 (en) | 2004-11-29 | 2005-11-10 | Device and method for controlling a public address system, and a corresponding public address system |
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US (3) | US9609434B2 (en) |
EP (1) | EP1800517B1 (en) |
JP (1) | JP4819823B2 (en) |
AT (1) | ATE405131T1 (en) |
DE (2) | DE102004057500B3 (en) |
WO (1) | WO2006058602A1 (en) |
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Also Published As
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JP2008522467A (en) | 2008-06-26 |
US9609434B2 (en) | 2017-03-28 |
ATE405131T1 (en) | 2008-08-15 |
US20130294624A1 (en) | 2013-11-07 |
WO2006058602A1 (en) | 2006-06-08 |
US9374641B2 (en) | 2016-06-21 |
US9955262B2 (en) | 2018-04-24 |
US20070269062A1 (en) | 2007-11-22 |
EP1800517B1 (en) | 2008-08-13 |
DE102004057500B3 (en) | 2006-06-14 |
DE502005005051D1 (en) | 2008-09-25 |
US20160205473A1 (en) | 2016-07-14 |
JP4819823B2 (en) | 2011-11-24 |
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