EP0781070B1 - Akustische Antenne für Computerarbeitsplatz - Google Patents

Akustische Antenne für Computerarbeitsplatz Download PDF

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Publication number
EP0781070B1
EP0781070B1 EP96402825A EP96402825A EP0781070B1 EP 0781070 B1 EP0781070 B1 EP 0781070B1 EP 96402825 A EP96402825 A EP 96402825A EP 96402825 A EP96402825 A EP 96402825A EP 0781070 B1 EP0781070 B1 EP 0781070B1
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EP
European Patent Office
Prior art keywords
antenna
microphones
microphone
support
layout
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.)
Expired - Lifetime
Application number
EP96402825A
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English (en)
French (fr)
Other versions
EP0781070A1 (de
Inventor
Yannick Mahieux
Grégoire Le Tourneur
Alain Saliou
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Orange SA
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France Telecom SA
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Publication date
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Publication of EP0781070A1 publication Critical patent/EP0781070A1/de
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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
    • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
    • 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
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
    • 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
    • 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

Definitions

  • the invention relates to an acoustic antenna for computer workstation.
  • radio stations IT work is set to grow, both in with regard to single-station workstations, which multi-user workstations, networked.
  • the workstation tends to become a communication interface between the user and the machine, or the workstation, or even between each user, when the workstations are networked.
  • a particularly interesting application of these workstations related to videoconferencing application during which several workstations and well heard their users can communicate through messages conveyed by audio and video links.
  • each workstation allows the user to communicate by video and audio messages regardless, in particular, of the position of the user, speaker, with respect to the station of work considered, or even, more generally, when several workstations are combined in the same meeting room, as part of a videoconference meeting multiple, regardless of the environmental context thus created, as well as noises generated by the fans of these workstations, external noise from air conditioning or other, as well as acoustic echo generated by the speakers of these workstations.
  • the aerial thus formed having the shape of a concave strip placed above the upper face of the video display monitor of the workstation, was considered unattractive by users or potential users.
  • the concave strip constituting the aforementioned aerial cannot be easily integrated into the terminal of the computer workstation, in particular into the housing of the video display monitor thereof, unless significant modifications of the latter are provided, these modifications being moreover likely to modify the generally satisfactory conditions of sound recording.
  • the object of the present invention is to remedy the aforementioned drawbacks of art acoustic antennas more specifically intended for computer work.
  • An object of the present invention is in particular the implementation of an acoustic antenna for computer work preserving properties of conditions sound recording, likely to be integrated without major difficulty to the video display monitor of the workstation for which it is intended.
  • Another object of the present invention is also the implementation of an acoustic antenna for station workstation presenting, in addition to the properties of aforementioned sound condition, which, although not easily integrated, presents a very discreet appearance and therefore easily acceptable aesthetically for users.
  • the acoustic antenna, object of the present invention finds application in the implementation of computer work, more particularly intended for videoconferencing applications.
  • the computer work includes a display monitor or display screen enabling the function of support of the acoustic antenna object of this invention.
  • the latter comprises a plurality of microphones, denoted M i , connected to a summing circuit intended, from an incident sound wave OSI, to deliver a corresponding sound signal.
  • the summing circuit is not shown so as not to overload the drawing.
  • the microphones M i are distributed in an arrangement to form at least one substantially rectilinear line, the line x'x in FIG. 2a.
  • the microphones M i are each spaced relative to a reference microphone, denoted M ir , placed in the vicinity of the vertical axis of symmetry of the screen according to a determined distribution law.
  • the reference microphone M ir allows, for a symmetrical configuration of the distribution of the microphones on the substantially rectilinear line x'x, to achieve a configuration symmetrical with respect to the average position of the user speaker.
  • the arrangement of aforementioned microphones then presents a substantially cylindrical directivity diagram whose axis of revolution is formed by the rectilinear line previously mentioned.
  • the acoustic antenna for computer workstation object of the present invention, corresponds to an embodiment of the "broadside" type.
  • the incident sound wave OSI coming from the speaker, is then perpendicular to the above-mentioned rectilinear line x'x on which the microphones M i are distributed.
  • the arrangement of microphones then presents a directivity diagram in reception which is constituted by a substantially vertical disk of width D in the azimuth plane P, that is to say in the plane comprising the azimuth angle for the reference microphone M ir .
  • the thickness of the disc thus formed in fact corresponds to the width of the main lobe of the directivity diagram on reception of the antenna thus formed.
  • the thickness D of the aforementioned disc is, at a given frequency, inversely proportional to the length of the antenna, that is to say ultimately to the number of microphones M i and their spacing compared to the reference microphone M ir .
  • the substantially straight line bears the reference y'y, this line being substantially parallel to the mean direction of propagation of the OSI incident sound wave.
  • the arrangement of microphones has, with respect to the reference microphone M ir , a directivity diagram in reception also substantially cylindrical, the axis of revolution being formed by the above-mentioned straight line.
  • the OSI incident sound wave parallel to the direction of the substantially rectilinear line y'y sees a more directivity pattern in reception insofar as the dimension D relative to the opening of the directivity in reception corresponds substantially to the diameter of the substantially cylindrical directivity diagram, the opening angle ⁇ of the main lobe being of the order of 80 °.
  • the reference microphone M ir is of course placed in the vicinity of the vertical axis of symmetry of the screen and the successive microphones M i are placed on the line y'y substantially in the vertical plane of symmetry of the aforementioned screen of the corresponding computer workstation.
  • the acoustic antenna according to the invention comprises, to make the arrangement of microphones, a plurality of microphones M i distributed on a first substantially horizontal line, placed in the upper part of the screen and at least one microphone placed on a second and a third line x 1 x ' 1 and x 2 x' 2 respectively, the second and the third line being placed perpendicular to the ends of the first line x'x.
  • the microphones of the first, second and third lines are arranged on a plane.
  • the microphones M i are arranged on an antenna support, made for example of plastic material, this antenna support and the corresponding microphones M i being arranged at the top of the filter. of the display screen, as shown in Figure 3a.
  • the antenna support and the microphones can also be placed on the screen itself or on the video monitor comprising this screen. More particularly, it is indicated that the microphone support can be produced by a plastic strip whose height is of the order of a few centimeters, 4 to 5 cm, in the direction orthogonal to the direction of propagation of the OSI incident sound wave.
  • the microphones M i are thus embedded in the support strip and are thus placed 2 or 3 cm in front of the screen itself.
  • the microphones M i and the reference microphone M ir are grouped by interconnection into elementary sub-antennas.
  • FIG 3b there is shown a detail of the antenna type "broadside" of Figure 3a, including the subdivision thereof into sub-antennas.
  • the microphones denoted M i0 to M i8 , are by way of nonlimiting example of unidirectional type. They are distributed symmetrically with respect to the central microphone M i0 constituting in fact the reference microphone M ir . The symmetrical distribution is heard on the support in the direction x'x orthogonal to the direction of the incident sound wave OSI.
  • Each microphone is connected to a common summator ⁇ by means of filters, denoted H 1 to H 4 , by means of elementary summers, denoted S 1 to S 4 , each elementary summer S 1 and S 4 in fact defining a sub-antenna.
  • each microphone to the aforementioned elementary summers can advantageously be carried out by means of corresponding switches, denoted I 0 to I 8 , and each elementary summator S 1 to S 4 can be connected to the common summator ⁇ via a filter H 1 to H 4 and a switch in series IS 1 to IS 4 .
  • x kd
  • k a relative integer
  • d an arbitrary distance linked to the cutoff frequency of the filters H 1 to H 4
  • x represents the algebraic value of the abscissa of each microphone with respect to the reference microphone M ir , the microphone M i0 .
  • d 2.13 cm
  • the abscissa of the 9 microphones installed on the support S were as follows: E7 E5 Mi3 e1 Mi0 Mi2 E4 E6 mi8 -8d -4d -2d -d 0 d 2d 4d 8d -17,04cm - 8.52 cm - 4.26 cm - 2.13 cm 0 2.13 cm 4.26 cm 8.52 cm 17.04 cm
  • the value of the distance d is chosen as a function of the value of the cutoff frequency of the filters H 1 to H 4 .
  • this embodiment corresponding to a "broadside" type antenna
  • the only solution which can be practically envisaged for increasing the aforementioned rejection rate is to reduce the thickness D of the disc, that is to say the opening dimension of the main lobe of the directivity diagram in reception, by the increase in the number of microphones M i and in the dimensions of the antenna thus produced.
  • the acoustic antenna shown in FIG. 2b is similar to the microphones known by the name of micro guns.
  • the correct set of delays applied to the elementary speech signals delivered by each microphone M i and by the reference microphone M ir are in fact preferred.
  • the directivity diagram in reception is, as shown in Figure 2b, formed by substantially a cylinder whose base is oriented towards the speaker.
  • the acoustic antenna according to the invention is subdivided into sub-antennas.
  • the acoustic antenna of the "end-fire" type, is deemed to consist of 9 successive microphones, aligned on a support from the reference microphone M ir designated by M i0 , noted S
  • the other successive microphones, in the direction of propagation of the incident sound wave OSI, are noted successively M i1 to M i8 .
  • the acoustic antenna according to the invention is subdivided into sub-antennas, each sub-antenna comprising microphones spaced on the rectilinear support by a determined distance.
  • a first sub-antenna is formed by the microphones M i8 to M i6 as well as by the microphones M i4 and by the reference microphone M ir , these microphones being connected to the same elementary adder S 1 , a second elementary antenna formed by microphones M i6 to M i4 as well as by microphones M i2 and M ir connected to the same elementary adder S 2 , and a third elementary antenna is finally formed by microphones M i4 to M i1 and by the reference microphone M ir linked to the same third elementary summator S 3 .
  • the elementary summers S 1 , S 2 , S 3 are connected to a common summator, denoted ⁇ , delivering the speech signal via, for example, filters, denoted H 1 , H 2 and H 3 .
  • the sound signal delivered by each microphone is then subjected to a corresponding delay via a delay circuit, denoted D 0 to D 7 in FIG. 4a, the microphone M i8 not being of course subject to no delay due to the maximum delay in receiving the sound signal from the speaker received by the latter microphone.
  • the maximum delay is thus provided by the delay circuit D 0 on the sound signal delivered by the reference microphone M ir or M i0 , the value of this delay being successively decreasing for the delays brought by the delay circuits D 1 to D 7 on the sound signals delivered successively by the corresponding microphones M i1 to M i7 .
  • the microphones M ir to M i1 , M i8 are successively spaced on the rectilinear support S by a distance in arithmetic progression of multiple reason of the smallest distance d separating the neighboring microphone from the microphone of reference.
  • k is a positive integer
  • c represents the propagation speed of the incident sound wave in the ambient environment
  • Fe represents the sampling frequency
  • the microphone M i1 is distant from the microphone M ir , reference microphone, by the distance d
  • the microphones M i2 to M i4 are each at the same distance d.
  • the microphones M i5 and M i6 are distant from the front microphone M i4 respectively M i5 by a distance 2d
  • the microphones M i7 and M i8 are distant from the front microphone, respectively M i6 , M i7 by a distance 4d .
  • the delay circuit D 0 makes it possible to apply a delay equal to the sum of the delays introduced by the maximum spacing between the reference microphone M ir and the extreme microphone M i8 , ie a delay corresponding to 16 sampling periods since in fact, the minimum elementary distance d separating two successive microphones corresponds to a time delay in propagation of the incident sound wave equal to a sampling period.
  • the delay circuits D 1 to D 7 make it possible successively to generate a delay equal to 15T, 14T, 13T, 12T, 10T, 8T and 4T where T represents the value of the sampling period of the sound signal delivered by each microphone.
  • d can arbitrarily not limitative be chosen identical in the case of the antenna "broadside” and in the case of the "end-fire” antenna.
  • delay circuits D 0 to D 7 As regards a practical embodiment of the delay circuits D 0 to D 7 , it is indicated that these delay circuits can be produced, either by analog circuits when the delay is applied directly at the output of each microphone concerned, or, on the contrary, from digital circuits when the delay is applied while the analog-to-digital conversion previously mentioned in the description has already been carried out.
  • the analog or digital embodiment of the delay circuits poses no problem because the analog to digital conversion of the speech signals delivered by each microphone can be carried out in a conventional manner from analog digital converters ⁇ , ⁇ .
  • Corresponding embodiments will not be described in detail in the present description because they correspond to techniques known to those skilled in the art.
  • These analog digital converters can be associated with the delay circuits or preferably at the output of the microphones, as mentioned in FIG. 4a by the reference + CAN.
  • the support S is made from a rigid support, acoustically not disturbing.
  • the support S can consist of a rigid rod forming the rectilinear support and by a multiple microphone stands, each microphone stand microphone being formed by a double mechanical part substantially symmetrical structural element.
  • the microphone supports carry, without limitation, the reference P 0 to P 4 for example.
  • Each microphone support P 0 to P 4 is formed by a mechanical part with a double element of substantially symmetrical structure, a first element of which is intended to ensure the positioning of the corresponding microphone support on the rigid rod S, while a second element is intended to receive and maintain a corresponding microphone.
  • the mechanical part with a double element of substantially symmetrical structure has the shape of an eight, one of the rings of which is threaded on the support S in order to ensure the positioning of the microphone support on the rigid rod S above, and the second ring constituting the second element is intended to receive and maintain a microphone.
  • the mechanical resistance of the microphones on the supports is guaranteed by a forced mounting, for example, or by a locking needle screw, any risk of shifting in position of the microphones being then eliminated.
  • Figure 4c there is shown a sectional view according to the longitudinal section plane Q of FIG. 4b.
  • the rod forming the support S is hollow and has a central core.
  • the support rod S is in additionally provided on one of the generating lines of the surface side thereof, a plurality of through holes connecting the central soul and the part outside of the rod, this to allow the passage of fc connection wires of each microphone in the core Central.
  • the mechanical parts to double structural element constituting the supports of microphones advantageously have a dimension thickness in the longitudinal y'y direction of the support S as low as possible, so as not to disturb the acoustic characteristics of each microphone.
  • the acoustic antenna, object of the present invention can advantageously include a set of switches, denoted I 0 to I 8 , a switch of this set of switches being placed in serial link on the connection for example to the corresponding delay circuits D 0 to D 7 or to the element summator S 1 .
  • Each switch I 0 to I 8 ensures the connection or non-connection of at least one microphone to the summing circuit ⁇ via the elementary summing circuits. This operating mode then makes it possible to modify the reception diagram of the acoustic antenna according to the invention as a function of the configuration of connection or non-connection of the microphones of the antenna.
  • the switching to a different antenna diagram can also be carried out by switching at the level of the output signals delivered by the sub-antennas, that is to say by the summers S 1 to S 3 .
  • specific switches IS 1 to IS 3 can be provided, as shown in FIG. 4a.
  • a larger lobe for the case where several people are present in front of the work station, can be obtained by replacing the sum at the output of the summator ⁇ by the signal delivered by the summator S 3 , that is to say say by the smaller sub-antenna.
  • the transfer function of the filter associated with the aforementioned sub-antenna is modified accordingly.
  • the elementary delay permit is equal to the sampling period previously mentioned in the description.
  • This elementary delay proves, however, insufficiently precise to ensure the pointing the antenna in the direction of the speaker.
  • a way of making such delays is to arrange these microphones so delays are multiple of the sampling period supra. It is no longer necessary, for pointing in the direction of the speaker, use expensive interpolation techniques in computation time term.
  • FIG. 5a there are shown different directivity diagrams in reception for an antenna of "broadside" type, FIG. 5a, using microphones omnidirectional, 9 microphones as shown in Figure 2a.
  • the directivity diagram thus represented, the microphones being aligned on the axis of symmetry x'x, present, as previously mentioned, substantially the appearance of a vertical disc, but more particular, that of a torus, at least for the lobe main as shown in Figure 5a.
  • the directivity diagram includes also degenerate lateral lobes extending into the direction x'x, these side lobes, although present, however, not being significantly represented in FIG. 5a, these being hidden in the representation chosen.
  • the directivity diagram of an antenna of the "end-fire" type has also been represented, also comprising 9 microphones placed as shown in FIG. 2b.
  • the microphones are of course placed and aligned in the direction y'y as shown in FIG. 5b, the directions x'x, y'y and z'z in FIG. 5a and in FIG. 5b being identical in order to facilitate the comparison.
  • the reference microphone M ir is placed in the vicinity of the origin of the axes OXYZ, the corresponding directivity diagrams being those carried out in the far field.
  • the directivity diagram has substantially the shape of a cylinder for which the opening of the main lobe is much greater than that of the opening of the main lobe of the directivity diagram of the "broadside antenna""shown in Figure 5a.
  • the speaker is, with respect to the reference microphone M ir , in the direction y'y.
  • FIGS. 5c and 5d there is shown, with a view to above, a top view respectively of FIG. 5a in which the lateral lobes of the directivity diagram are apparent, and from FIG. 5b in which the lobe rear has been removed by judicious choice of spacings microphones and delays that are applied to speech signals generated by them. Microphones used in this case are unidirectional.
  • FIG. 5d the diagram of directivity of an end-fire antenna for which the microphones are distributed in the direction y'y. From a broadside antenna, for which the microphones are distributed in the direction x'x and whose directivity diagram is shown in Figure 5c, it is possible, according to a remarkable aspect of the antenna object of the invention, to obtain a diagram of directivity similar to that of an end-fire antenna such as shown in Figure 5d, but subject to a rotation of ⁇ / 2 by the introduction of delays on the signals delivered by the microphones, the axis of symmetry of the diagram directivity then being the axis x'x.
  • the spatial selectivity of acoustic antennas used is linked to the ratio of their size at the wavelength considered. In the field at low frequencies, the antennas used reduce little effect of the acoustic environment of these.
  • the switches mentioned above can then be used so as to switch on demand the antenna of the "end-fire” type or, if necessary, the antenna of the "broadside” type on a preferred microphone, the reference microphone M ir , all the other microphones being for example disconnected.
  • a certain spatial selectivity can however be kept by switching to a specific sub-antenna smaller.
  • the antenna acoustics, object of the present invention Compared to a single microphone, the antenna acoustics, object of the present invention, whether in its "broadside” or “end-fire” embodiment, improves echo control since this type of antenna increases, by its spatial selectivity, the decoupling between the speaker and the sound system.
  • the electronic orientation of the main lobe antenna can be realized thanks to the implementation of devices for interpolating the delivered speech signals by each microphone, such an orientation function main lobe electronics that can only be optimized in the event that a speaker locator system is used.
  • Such an electronic orientation function of the main lobe finds a privileged application in the context of use and application for videoconferencing.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (8)

  1. Akustische Antenne für einen Computerarbeitsplatz, umfassend einen Anzeigebildschirm, umfassend eine Vielzahl von Mikrofonen, die an eine Summierschaltung angeschlossen sind, wobei die Mikrofone derart verteilt angeordnet sind, daß sie zumindest eine gerade Linie bilden und jeweils von einem Referenzmikrofon, das dazu bestimmt ist, in der Nähe der vertikalen Symmetrieachse des Bildschirms angeordnet zu sein, nach einem bestimmten Gesetz entfernt sind, wobei die Anordnung eine Vielzahl von Mikrofonen umfasst, die auf einer ersten im Wesentlichen horizontalen Linie verteilt sind, die dazu bestimmt ist, am oberen Teil des Bildschirms angeordnet zu werden, dadurch gekennzeichnet, daß die Anordnung ferner mindestens ein Mikrofon umfasst, das auf einer zweiten bzw. dritten Linie angeordnet ist, wobei die zweite und dritte Linie senkrecht auf die Enden der ersten Linie angeordnet sind, wobei die Mikrofone der ersten, zweiten und dritten Linie in einer selben Ebene angeordnet sind, wobei die Anordnung ein im Wesentlichen zylindrisches Richtwirkungsdiagramm aufweist, dessen Umdrehungsachse von der ersten geraden Linie gebildet ist.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, daß die Mikrofone auf einem Antennenträger angeordnet sind, der dazu bestimmt ist, am oberen Teil des Filters des Anzeigebildschirms dieses Bildschirms oder Monitors, der diesen Bildschirm umfasst, angeordnet zu werden.
  3. Computerarbeitsplatz, umfassend einen Anzeigebildschirm und eine akustische Antenne, umfassend eine Vielzahl von Mikrofonen, die an eine Summierschaltung angeschlossen sind, wobei die Mikrofone derart verteilt angeordnet sind, daß sie mindestens eine gerade Linie bilden und jeweils in Bezug auf ein Referenzmikrofon, das in der Nähe der vertikalen Symmetrieachse des Bildschirms angeordnet ist, nach einem bestimmten Gesetz entfernt sind, wobei die Anordnung eine Vielzahl von Mikrofonen umfasst, die auf einem geraden Träger angeordnet sind, dadurch gekennzeichnet, daß der gerade Träger im Wesentlichen in der vertikalen Symmetrieebene des Anzeigebildschirms angeordnet ist, welche Mikrofone in Bezug auf das Referenzmikrofon nach einem bestimmten Gesetz entfernt sind, um eine Antenne des Typs "Endfire" zu bilden, wobei die Antenne in Unterantennen unterteilt ist, wobei jede Unterantenne Mikrofone umfasst, die auf dem geraden Träger in einem bestimmten Abstand voneinander entfernt sind, wobei die Anordnung. ein im Wesentlichen zylindrisches Richtwirkungsdiagramm aufweist, dessen Umdrehungsachse von der mindestens einen geraden Linie gebildet ist.
  4. Antenne nach einem der Ansprüche 1 und 2 oder Antenne an einem Arbeitsplatz nach Anspruch 3, dadurch gekennzeichnet, daß bei einer Antenne, die Analog-Digital-Umsetzer für das von jedem Mikrofon durch Bemusterung mit einer gegebenen Bemusterungsfrequenz FE gelieferte Schallsignal umfasst, jedes Mikrofon von dem Referenzmikrofon nach einem derartigen Abstandsgesetz entfernt ist, daß die Empfangsverzögerungen einer eintreffenden Schallwelle durch jedes Mikrofon Vielfache der Bemusterungszeit sind.
  5. Antenne nach Anspruch 4, dadurch gekennzeichnet, daß die Mikrofone nacheinander auf dem geraden Träger um einen Abstand in arithmetischer Progression eines vielfachen Verhältnisses des geringsten Abstandes zwischen dem benachbarten Mikrofon und dem Referenzmikrofon entfernt sind, wobei der Abstand zwischen zwei aufeinanderfolgenden Mikrofonen folgende Formel aufweist: x = kd = k c/Fe wobei k eine ganze Zahl ist, c die Ausbreitungsgeschwindigkeit der eintreffenden Schallwelle bezeichnet.
  6. Arbeitsplatz nach Anspruch 3, dadurch gekennzeichnet, daß die Antenne umfasst:
    eine starre Stange, die den geraden Träger bildet;
    eine Vielzahl von Mikrofonträgern, wobei jeder Mikrofonträger von einem mechanischen Teil mit doppeltem, im Wesentlichen symmetrischem Strukturelement gebildet ist, wobei ein erstes Element dazu bestimmt ist, die Anbringung des Mikrofonträgers auf der starren Stange sicher zu stellen, und ein zweites Element dazu bestimmt ist, ein Mikrofon aufzunehmen und den Halt desselben sicher zu stellen.
  7. Arbeitsplatz nach Anspruch 6, dadurch gekennzeichnet, daß die Stange hohl ist und einen zentralen Kern umfasst, wobei die Stange ferner auf einer ihrer Mantellinien ihrer Seitenfläche mit einer Vielzahl von Durchgangslöchern versehen ist, die den zentralen Kern mit dem äußeren Teil der Stange verbinden, wodurch der Durchgang der Drähte für den Anschluss jedes Mikrofons an dem zentralen Kern möglich ist.
  8. Antenne nach einem der Ansprüche 1, 2, 4 und 5 oder Antenne an einem Arbeitsplatz nach einem der Ansprüche 3, 6 und 7, dadurch gekennzeichnet, daß die Antenne ferner einen Satz von Schaltern umfasst, die es ermöglichen, den Anschluss mindestens eines Mikrofons und einer Unterantenne an die Summierschaltung sicher zu stellen, wobei die Übertragungsfunktion des mit dieser Unterantenne verbundenen Filters verändert wird, wodurch es möglich ist, das Empfangsdiagramm der Antenne in Abhängigkeit von der Anschlussoder Nichtanschlussausführung der Mikrofone der Antenne zu ändern.
EP96402825A 1995-12-22 1996-12-19 Akustische Antenne für Computerarbeitsplatz Expired - Lifetime EP0781070B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9515387 1995-12-22
FR9515387A FR2742960B1 (fr) 1995-12-22 1995-12-22 Antenne acoustique pour station de travail informatique

Publications (2)

Publication Number Publication Date
EP0781070A1 EP0781070A1 (de) 1997-06-25
EP0781070B1 true EP0781070B1 (de) 2003-07-16

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EP96402825A Expired - Lifetime EP0781070B1 (de) 1995-12-22 1996-12-19 Akustische Antenne für Computerarbeitsplatz

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US (1) US5848170A (de)
EP (1) EP0781070B1 (de)
DE (1) DE69629095D1 (de)
FR (1) FR2742960B1 (de)

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US7792676B2 (en) * 2000-10-25 2010-09-07 Robert Glenn Klinefelter System, method, and apparatus for providing interpretive communication on a network
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Also Published As

Publication number Publication date
FR2742960A1 (fr) 1997-06-27
DE69629095D1 (de) 2003-08-21
US5848170A (en) 1998-12-08
EP0781070A1 (de) 1997-06-25
FR2742960B1 (fr) 1998-02-20

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