EP1258168A1 - Procede et dispositif de comparaison de signaux pour le controle de transducteurs et systeme de controle de transducteurs - Google Patents
Procede et dispositif de comparaison de signaux pour le controle de transducteurs et systeme de controle de transducteursInfo
- Publication number
- EP1258168A1 EP1258168A1 EP01907816A EP01907816A EP1258168A1 EP 1258168 A1 EP1258168 A1 EP 1258168A1 EP 01907816 A EP01907816 A EP 01907816A EP 01907816 A EP01907816 A EP 01907816A EP 1258168 A1 EP1258168 A1 EP 1258168A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- information
- microphone
- loudspeaker
- microphones
- 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
Classifications
-
- 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 a method for automatic comparison between information characterizing the reference values and information characterizing current values of the sound systems of a system of micropnones and of loudspeakers for monitoring the sound chain.
- the field of the invention is that of automatic control of gains, of operation and of the position of several microphones and of several loudspeakers in the context of a videoconference system between participants located on separate sites which are generally distant.
- the invention also applies to the control of microphones and loudspeakers installed in the same room such as a theater stage, concert, cinema,
- the invention makes it possible to approach a situation of natural communication: when a participant changes place in a meeting room during a meeting, the sound follows him in the room or in the rooms or e ⁇ is listening through example c ur speaker to another depending on its joinedeme n t. Microphones and -.es speakers will be designated by transducers. The problem consists in detecting the changes which have occurred in the transducers between their installation and the moments at which the control is carried out.
- the present invention therefore relates to a method of comparing information characterizing these reference values and information characterizing current values of sound chains of a system of (n) microphones v ⁇ and (p) loudspeakers hp- for the control of said sound channels characterized in that
- a reference matrix r is saved, consisting of all the hp-iiru reference information obtained following the sending of the sound signal S,
- step A as soon as we wish to make a comparison, we proceed step A with an audible signal S 'to obtain this current information from a matrix Q,
- the subject of the invention is also a device for comparing information characterizing these reference values and information characterizing current values of sound chains of a subsystem.
- n microphones m and p hp speakers for sound chain control characterized in that it includes means for measuring np-, m_ information characterizing the sound channels comprising a microphone ⁇ n and a speaker lah -, digital processing means for comparing said information and related to these digital processing means, means for saving the matrix Qr constituted by all of the information hp ⁇ ⁇ ⁇ .
- the invention also relates to a control system of sound channels comprising several devices such as above, characterized in that the depots are distributed in several rooms and in that it comprises a high speed telecommunications network connecting said rooms and means for centralizing the management of the devices.
- FIG. 1a represents a schematic view of a videoconference room according to the invention
- FIG. 1 b is a diagrammatic representation of the direct paths between loudspeakers and microphones
- FIGS. 2a) and 2b) are representations of sound chains respectively in the case of local processing and in the case where the processing is carried out in the network
- FIGS. 3a) and 3b) respectively represent examples of white noise courses, of USASI noise on the one hand and pink noise and of pseudo random binary sequence on the other hand,
- FIG. 4 represents the impulse response of a microphone following the sending by a loudspeaker of a random pseu ⁇ c binary sequence
- FIG. 5 represents a schematic view of the configuration of the digital signal processing card
- FIG. 6 is a schematic representation of a system of microphones and speakers distributed in several rooms interconnected by a multipoint bridge.
- a videoconference is established between participants distributed in several rooms, a telecommunications network broadband has so u n ATM network being used for the transport of visual information and sound.
- a videoconferencing room represented in FIG. 1 a is provided with a viewing screen E, several microphones m ⁇ and several speakers hp 3 allowing a spatialized rendering of the audiovisual scene of _a (or) room (s) d ⁇ stante (s).
- the loudspeakers can be located indifferently all below the screen, all above or distributed as indicated in FIG. La, or even according to a completely different arrangement.
- the videoconferencing room used for the invention is equipped with six microphones and six speakers, the distance between microphones and loudspeaker. speakers typically being between three and five meters.
- the sound chains between the microphones 1 and the loudspeakers hp D of a local processing system shown in FIG. 2a) include the microphones rm, the microphone preamplifiers am x , the analog digital converters CAN X , the digital processing card, the analog digital converters CNA- ,, the amplifiers of the speakers ahp 3 , the loudspeakers hp-, and the room.
- the sound chains between the microphones m x and the loudspeakers hp-, of a remote processing system shown in FIG. 2b include the microphones m x , the microphone preamplifiers am ,, the converters digital analog CANi, coders C lr transport network R, decoder D, digital processing card, coder C, transport network R, decoders D-, analog digital converters DAC 3 , amplifiers of high -ahp- speakers, hp- speakers, and the room.
- Such a system A which can be controlled remotely, allows this level of the sound chain to direct from one transducer to another the information characterizing a transducer.
- transducer (respectively loudspeaker or microphone), the transducer (respectively loudspeaker or microphone) and the elements ⁇ e the sound chain included between the digital processing card and the transducer (respectively loudspeaker or microphone).
- Audible signal means a signal that can be emitted by the speakers and detected by the microphones. As shown in Figures 2a) and 2b), a sound signal S is sent to all p speakers hp- ,, one after the other at t x ,.
- n rm microphones each in turn and retrieved from the n rm microphones.
- hp ] m 1 the information characterizing the sound chain including the speaker hp-, and the microphone rm.
- the set of these hp ⁇ rm constitutes a matrix ae dimension n * p, a row of the matrix corresponding to a loudspeaker and a column to a microphone.
- these steps are repeated with a signal S 'to obtain the current values hp- j im,. and constitute a matrix Q which is compared to the matrix Q r .
- the elements hp ] m 1 are established from signals S and S 'considered in the time domain, but we can be located in the domain at frequencies and establish the matrices Q and / or Q r from the spectral responses p - i ! microphones m x at a frequency band sent by the loudspeakers hp-,: whatever the width of the frequency band of the signals S and S 'sent by the loudspeakers hp- , only one frequency band determined will be received by m x microphones. It could be a frequency band with a width of around 200 Hz, an octave band or a third of an octave.
- the spectral responses of the transducers will be checked by frequency band.
- the comparison between the matrices Q and Q r makes it possible in particular to obtain information on the possible displacement of the transducers, these being directional and their directivity depending on the frequency.
- the exploitation of the results is sometimes more complex than when one is in the time domain.
- the sound signals S and S ′ are generally recorded in the internal memory of the digital signal processing card. They can possibly be calculated (generics) in this card.
- These sound signals can be, for example, white noise, pink noise, a USASI oruit, a pseudo-random binary sequence represented respectively in FIGS. 3a) and 3b) or a frequency shuffle of sinusoid, filter noise by octave or third of an octave or another beep.
- a pseudo-random Dinary sequence is purely deterministic; it is a sequence of 1 and -1 of length N. These sequences have for characteristic that their correlation function is worth N in 0 and -1 elsewhere. The latter is therefore very close to a Dirac ⁇ e distribution.
- the method according to the invention was carried out with a pink noise sent successively to each of the speakers for one second. Between two sendings on two consecutive loudspeakers, one waits a certain time (period of silence) so that the following sound signal starts in a state a priori stable of the sound chain.
- the invention was carried out with a period of silence of two seconds.
- the elements np D m are determined for each hp-, at the same time t of the sound signal.
- this difference is included in a predetermined range denoted FHP for the loudspeakers and FM for the microphones, no correction is applied, the difference being tolerable.
- a threshold ⁇ e 3 dB is for example commonly accepted for a videoconference room.
- a corresponding deviation is applied as a correction to the transducer, at the level of the digital signal processing card.
- the correction could possibly apply to the gain of the transducer itself. In some cases, the correction will consist in repositioning the transducer; in other cases the correction cannot be applied due to a failure of the transducer and the defective transducer will then be changed.
- each impulse response R ]: L provides information concerning the delay, that is to say the propagation time between a loudspeaker hp-, and a microphone m lf l ' direct wave corresponding to the direct paths between speaker hp-, and microphone lr or the room effect corresponding to the paths with one or more reflections.
- t 0 the time at which the sound signal is sent from a speaker hp-,
- t ⁇ 31 the time at which the microphone ⁇ . receives the direct wave
- t 2] 1 the instant at which the room effect for the microphone m x begins.
- Delays can be measured to check the respective position of the transducers themselves. Now calculate the matrix Q r by measuring for the first time -_the delays (hp-, TM. ! ) Qr . By triangulation we deduce from these delays the position of the transducers: if knowing for example the position of hpi and hp-, we consider .es delays (hp ⁇ m. ⁇ ) Qr and (hp-, m ⁇ ) Qr , we deduce the position microphone m x when establishing the reference matrix. So on for the other microphones. The same reasoning can be applied to determine the position of the speakers from those of the microphones.
- the transducer When calculating the delays later (hp- j iti Q of the matrix Q, we will identify by comparison with the delays of the matrix Q r , the transducer having changed position. In some cases, a correction will be applied to the transducer, at the digital signal processing card, to compensate for the position change, in other cases, the correction will consist in repositioning the transducer itself.
- shakes element hp 3 m x of matrices Q and Q will represent the part of the impulse response following the first peak and starting at t 2 ⁇ .
- An application of the invention consists in evaluating the signal-to-noise ratio of the micropnones ⁇ by comparing the average values of the micropnones calculated from the established matrix Q by considering a sound signal S with those of the microphones calculated from the established matrix Q considering a signal S 'of silence.
- the signal S can in particular be a white, pink, USASI oruit or a pseudo-random binary sequence. If the signal S is interspersed with silences, in practice, the ratio signa. To noise will be measured during a phase of silence.
- the processing of information includes in particular the measurements, calculations, backups and ..es corrections to be made.
- the remote processing can be carried out by a computer controlling remotely via the network, another computer located in a local area.
- An echo phenomenon sometimes occurs: when a participant speaks in a room A, the corresponding sound signal is transmitted to the participants located in a room B by the speakers of this room B, the micropnones of this room B picking up the signal from these loudspeakers to retransmit them to room A. The speaker in room A reenten ⁇ with echo. This echo can be evaluated by measuring the level of the return signal in relation to the level of the signal sent. The control parameters of the transducer gain variation or echo cancellation algorithms are then adjusted.
- ⁇ e transmission k channels are numbered from 1 to K, for example we will designate by r ⁇ the sound channel comprising a transmission channel k transmitting from the room to which it is connected to the PMP bridge and by e ⁇ ⁇ the sound chain comprising a transmission channel k 'transmitting from the PMP bridge to the dirt to which it is connected, which may be equal to k'.
- the elements ⁇ p-, m will then be replaced by r k e k ' .
- the device comprises a digital processing card for the CTN signal presented in FIG. 5.
- This card comprises means for measuring Mes of the information hp- j i ", ! , Processing means T and means for saving files SF such as an internal memory in which one or even several sound signals are recorded.
- This sound signal can also be calculated by the processing means T.
- the matrix elements hp -,] ⁇ of the matrix (s) (s- Q r and possibly one or more Q matrices are also saved in the internal memory, as well as the parameters of the various elements of each of the sound chains obtained during the setting of the room (s).
- the processing means allow to compare elements hp- j im or combinations thereof of the same matrix Q or of several matrices.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Stereophonic System (AREA)
- Selective Calling Equipment (AREA)
- Analogue/Digital Conversion (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0001976A FR2805433A1 (fr) | 2000-02-17 | 2000-02-17 | Procede et dispositif de comparaison de signaux pour le controle de transducteurs et systeme de controle de transducteurs |
FR0001976 | 2000-02-17 | ||
PCT/FR2001/000457 WO2001062044A1 (fr) | 2000-02-17 | 2001-02-15 | Procede et dispositif de comparaison de signaux pour le controle de transducteurs et systeme de controle de transducteurs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1258168A1 true EP1258168A1 (fr) | 2002-11-20 |
EP1258168B1 EP1258168B1 (fr) | 2011-04-13 |
Family
ID=8847099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01907816A Expired - Lifetime EP1258168B1 (fr) | 2000-02-17 | 2001-02-15 | Procede et dispositif de comparaison de signaux pour le controle de transducteurs et systeme de controle de transducteurs |
Country Status (8)
Country | Link |
---|---|
US (2) | US20030108208A1 (fr) |
EP (1) | EP1258168B1 (fr) |
JP (1) | JP4691304B2 (fr) |
AT (1) | ATE505911T1 (fr) |
AU (1) | AU2001235692A1 (fr) |
DE (1) | DE60144420D1 (fr) |
FR (1) | FR2805433A1 (fr) |
WO (1) | WO2001062044A1 (fr) |
Families Citing this family (14)
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US7336793B2 (en) * | 2003-05-08 | 2008-02-26 | Harman International Industries, Incorporated | Loudspeaker system for virtual sound synthesis |
US20080284409A1 (en) * | 2005-09-07 | 2008-11-20 | Biloop Tecnologic, S.L. | Signal Recognition Method With a Low-Cost Microcontroller |
US8208645B2 (en) * | 2006-09-15 | 2012-06-26 | Hewlett-Packard Development Company, L.P. | System and method for harmonizing calibration of audio between networked conference rooms |
US8620976B2 (en) | 2009-11-12 | 2013-12-31 | Paul Reed Smith Guitars Limited Partnership | Precision measurement of waveforms |
CN102770856B (zh) | 2009-11-12 | 2016-07-06 | 保罗-里德-史密斯-吉塔尔斯股份合作有限公司 | 用于精确波形测量的域识别和分离 |
JP5706910B2 (ja) * | 2009-11-12 | 2015-04-22 | ポール リード スミス ギターズ、リミテッド パートナーシップ | デジタル信号処理のための方法、コンピュータ可読ストレージ媒体および信号処理システム |
US10295434B2 (en) | 2011-05-27 | 2019-05-21 | Marcos Underwood | Direct field acoustic testing system, controls, and method |
JP6247219B2 (ja) * | 2011-10-27 | 2017-12-13 | ラーキン,ポール | 直接音場音響試験の駆動信号分配 |
US8873821B2 (en) | 2012-03-20 | 2014-10-28 | Paul Reed Smith Guitars Limited Partnership | Scoring and adjusting pixels based on neighborhood relationships for revealing data in images |
US9596553B2 (en) * | 2013-07-18 | 2017-03-14 | Harman International Industries, Inc. | Apparatus and method for performing an audio measurement sweep |
WO2015073985A2 (fr) * | 2013-11-15 | 2015-05-21 | Msi Dfat Llc | Réduction des ondes stationnaires lors d'essais acoustiques en champ direct |
JP6518530B2 (ja) * | 2015-06-26 | 2019-05-22 | 京セラ株式会社 | 電子機器 |
US10306129B1 (en) * | 2016-06-28 | 2019-05-28 | Amazon Technologies, Inc. | Local and remote video-camera control |
US9837064B1 (en) | 2016-07-08 | 2017-12-05 | Cisco Technology, Inc. | Generating spectrally shaped sound signal based on sensitivity of human hearing and background noise level |
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2000
- 2000-02-17 FR FR0001976A patent/FR2805433A1/fr active Pending
-
2001
- 2001-02-15 DE DE60144420T patent/DE60144420D1/de not_active Expired - Lifetime
- 2001-02-15 US US10/203,856 patent/US20030108208A1/en not_active Abandoned
- 2001-02-15 JP JP2001560172A patent/JP4691304B2/ja not_active Expired - Lifetime
- 2001-02-15 AU AU2001235692A patent/AU2001235692A1/en not_active Abandoned
- 2001-02-15 WO PCT/FR2001/000457 patent/WO2001062044A1/fr active Application Filing
- 2001-02-15 AT AT01907816T patent/ATE505911T1/de not_active IP Right Cessation
- 2001-02-15 EP EP01907816A patent/EP1258168B1/fr not_active Expired - Lifetime
-
2007
- 2007-05-30 US US11/755,563 patent/US7804963B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO0162044A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001062044A1 (fr) | 2001-08-23 |
DE60144420D1 (de) | 2011-05-26 |
US20030108208A1 (en) | 2003-06-12 |
JP2003523674A (ja) | 2003-08-05 |
JP4691304B2 (ja) | 2011-06-01 |
ATE505911T1 (de) | 2011-04-15 |
AU2001235692A1 (en) | 2001-08-27 |
US7804963B2 (en) | 2010-09-28 |
FR2805433A1 (fr) | 2001-08-24 |
US20070286430A1 (en) | 2007-12-13 |
EP1258168B1 (fr) | 2011-04-13 |
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