EP0002413A1 - Procédé de prise de son dans une salle et installation pour la mise en oeuvre de ce procédé - Google Patents

Procédé de prise de son dans une salle et installation pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0002413A1
EP0002413A1 EP78400205A EP78400205A EP0002413A1 EP 0002413 A1 EP0002413 A1 EP 0002413A1 EP 78400205 A EP78400205 A EP 78400205A EP 78400205 A EP78400205 A EP 78400205A EP 0002413 A1 EP0002413 A1 EP 0002413A1
Authority
EP
European Patent Office
Prior art keywords
phase
microphones
room
location
electrical signals
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.)
Withdrawn
Application number
EP78400205A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernard Charles Regamey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0002413A1 publication Critical patent/EP0002413A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the invention relates to sound recording in a room and in particular a conference room.
  • the invention is remarkable in that it makes it possible to selectively favor a location in the room, where there is a congressman wishing to speak, so that the sounds emitted at this location are more amplified than those that are emitted everywhere else in the room.
  • the sound recording in a conference room poses many problems. Particularly, when it is a congress where all the participants may have to speak, we come up against a major difficulty linked to a certain indiscipline of the delegates. If the speaker is an important personality, he is generally in a forum which benefits from preferential means of taking his sound and therefore has therefore little difficulty in being heard. On the other hand, when one wishes to temporarily give the floor to a congressman located in the room, the sound of his voice is very often drowned in the hubbub of neighboring conversations or contradictory interpellations, if this congressman does not benefit at this precise moment. '' a particular means of amplification.
  • the invention is remarkable in that it makes it possible to amplify the sound of the voice of a participant located at a very precise location in the room, with relative attenuation of the sounds emitted everywhere else in the same room, without said participant. have to leave their seat or without having to bring them a microphone.
  • the invention uses only a limited number of microphones and therefore results in inexpensive sound systems.
  • a conference room 11 arranged of conventional Aacon with a number of chairs for participants or delegates and a table with a platform 12 behind which are arranged a number of chairs F for participants most important of the assembly.
  • the grandstand table 12 can be equipped with microphones (not shown) favoring the participants installed in the seats F; this is however not essential in the context of the invention.
  • a public address booth 13 is arranged near the room 11.
  • This booth includes a console 18 which can group together certain elements of the installation according to the invention at the same time as a luminous call board or the like making it possible to immediately identify a participant installed in any of the f chairs who has asked to speak.
  • This type of call panel is conventional and is not part of the invention.
  • the invention uses only a limited number of microphones (four microphones M 1 , M 2 , M3 , M 4 according to the example shown) arranged in the room so as to be relatively distant from each other and which capture all the sounds emitted in the room.
  • the microphones M 1 -M 4 are connected to four corresponding inputs e 1 -e4 of a phase-shifting system D.
  • This phase-shifting system D is connected to be controlled by an addressing system 14 from data stored once and for all in a memory 15 also connected to the addressing system 14 and of which an output S is connected to the phase shifter system D to introduce data there.
  • the outputs s 1 -s 4 of the phase shifter system D are connected to corresponding inputs e ' 1 -e' 4 of an adder circuit A whose output S 'is connected to a sound system comprising for example a amplifier 16 and one or more speakers 17.
  • a sound system comprising for example a amplifier 16 and one or more speakers 17.
  • the entire installation shown diagrammatically in FIG. 2 can be housed in the cabin 13 with the exception of the microphones M 1 -M 4 and the speaker (s) 17 which are obviously placed in conference room 11.
  • the memory 15 is preprogrammed, which will be established once and for all.
  • the relative phase shifts of the sounds picked up by the microphones M1-M 4 are determined or measured when a sound source is located at one of the predetermined locations (for example the chair f 1 ).
  • the components of the sound signals picked up by the four microphones are represented, which correspond to a sound emitted from the location f 1 .
  • phase-shifting system D When the participant or conventioneer in the chair f 1 requests to speak, an operator located in the cabin 13 performs a selection operation from the addressing system 14 and then the memory 15 communicates to the phase-shifting system D the values of the phase shifts t 2 , t 3 and t 4 taken with respect to the signal picked up by the microphone M 1 .
  • the role of the phase shift system D is then to delay the sound picked up by the microphone M 2 by a time t 2 , to delay the sound picked up by the microphone M 3 by a time t 3 and to delay the sound picked up by the microphone M 4 of a time t 4 .
  • the adder circuit A receiving the signals coming from the microphones M 1 -M 4 by means of the phase shift system D will automatically carry out an amplification of said components of the electrical signals representative of the sounds emitted at the location f 1 .
  • these components are added so that the sound emitted in f 1 is practically amplified by a factor 4 (the number of microphones) while the components of the sounds emitted everywhere else in the room are algebraically added.
  • the installation shown in FIG. 2 can be easily modified to allow selective picking up of two (or more) chosen locations. It then suffices to double the circuits of the phase-shifting system D and to provide for example two adding circuits such as A whose outputs would be connected to the same amplification means of the room.
  • the memory 15 would be capable of simultaneously communicating two groups of data to the phase shifting system.
  • the selection can be made by the participants themselves, if each has a push button allowing him to select his own location; another pressure where . pressing a second push button cancels the selection.
  • the system according to the invention is also compatible with a simultaneous translation installation.
  • the loudspeakers are replaced by individual headphones broadcasting the message of the selected participant, translated by an interpreter.

Landscapes

  • 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)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Stereophonic Arrangements (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
EP78400205A 1977-12-02 1978-12-01 Procédé de prise de son dans une salle et installation pour la mise en oeuvre de ce procédé Withdrawn EP0002413A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7736328A FR2410930A1 (fr) 1977-12-02 1977-12-02 Procede de prise de son dans une salle et installation pour la mise en oeuvre de ce procede
FR7736328 1977-12-02

Publications (1)

Publication Number Publication Date
EP0002413A1 true EP0002413A1 (fr) 1979-06-13

Family

ID=9198372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78400205A Withdrawn EP0002413A1 (fr) 1977-12-02 1978-12-01 Procédé de prise de son dans une salle et installation pour la mise en oeuvre de ce procédé

Country Status (3)

Country Link
EP (1) EP0002413A1 (ja)
JP (1) JPS5485701A (ja)
FR (1) FR2410930A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556914A1 (fr) * 1983-12-14 1985-06-21 Deutsche Post Rundfunk Systeme de sonorisation de grands espaces
EP0613319A1 (fr) * 1993-02-23 1994-08-31 France Telecom Dispositif multicapteurs de prise de son et de traitement du signal associé
US20120189140A1 (en) * 2011-01-21 2012-07-26 Apple Inc. Audio-sharing network

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896189A (en) * 1952-02-08 1959-07-21 Electro Voice Higher order pressure gradient microphone system having adjustable polar response pattern
US3109066A (en) * 1959-12-15 1963-10-29 Bell Telephone Labor Inc Sound control system
US3538254A (en) * 1968-07-30 1970-11-03 Ancha Electronics Inc Automatic sound system with a plurality of microphones
US3644674A (en) * 1969-06-30 1972-02-22 Bell Telephone Labor Inc Ambient noise suppressor
US3952156A (en) * 1972-09-07 1976-04-20 Xerox Corporation Signal processing system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896189A (en) * 1952-02-08 1959-07-21 Electro Voice Higher order pressure gradient microphone system having adjustable polar response pattern
US3109066A (en) * 1959-12-15 1963-10-29 Bell Telephone Labor Inc Sound control system
US3538254A (en) * 1968-07-30 1970-11-03 Ancha Electronics Inc Automatic sound system with a plurality of microphones
US3644674A (en) * 1969-06-30 1972-02-22 Bell Telephone Labor Inc Ambient noise suppressor
US3952156A (en) * 1972-09-07 1976-04-20 Xerox Corporation Signal processing system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556914A1 (fr) * 1983-12-14 1985-06-21 Deutsche Post Rundfunk Systeme de sonorisation de grands espaces
GB2151439A (en) * 1983-12-14 1985-07-17 Deutsche Post Inst Sound transmission system
EP0613319A1 (fr) * 1993-02-23 1994-08-31 France Telecom Dispositif multicapteurs de prise de son et de traitement du signal associé
FR2702118A1 (fr) * 1993-02-23 1994-09-02 Le Tourneur Gregoire Dispositif multicapteurs de prise de son et de traitement du signal associé.
US20120189140A1 (en) * 2011-01-21 2012-07-26 Apple Inc. Audio-sharing network

Also Published As

Publication number Publication date
JPS5485701A (en) 1979-07-07
FR2410930A1 (fr) 1979-06-29

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