WO2008036992A2 - Procédé et dispositif de mesure pour le contrôle de systèmes de sonorisation - Google Patents

Procédé et dispositif de mesure pour le contrôle de systèmes de sonorisation Download PDF

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Publication number
WO2008036992A2
WO2008036992A2 PCT/AT2007/000454 AT2007000454W WO2008036992A2 WO 2008036992 A2 WO2008036992 A2 WO 2008036992A2 AT 2007000454 W AT2007000454 W AT 2007000454W WO 2008036992 A2 WO2008036992 A2 WO 2008036992A2
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WO
WIPO (PCT)
Prior art keywords
signal
impedance
level
value
line
Prior art date
Application number
PCT/AT2007/000454
Other languages
German (de)
English (en)
Other versions
WO2008036992A3 (fr
Inventor
Josef Schreiner
Wolfgang Zelenka
Original Assignee
Honeywell Life Safety Austria Gmbh
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 Honeywell Life Safety Austria Gmbh filed Critical Honeywell Life Safety Austria Gmbh
Priority to EP07800194.8A priority Critical patent/EP2070388B1/fr
Publication of WO2008036992A2 publication Critical patent/WO2008036992A2/fr
Publication of WO2008036992A3 publication Critical patent/WO2008036992A3/fr

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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
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/007—Monitoring arrangements; Testing arrangements for public address systems

Definitions

  • the invention relates to a method for monitoring loudspeaker lines by impedance measurement, in which the input of a speaker line at least an AC signal personallystirnmter frequency is supplied voltage and current at the input of the line are measured and determined from these measurements, the input impedance to the line and with a reference value is compared.
  • the invention relates to an apparatus for carrying out the method according to the invention.
  • Sound systems should be understood in any case in the context of the present invention, a system in which at least one speaker line, which is generally connected to a plurality of speakers, is fed by one or more power amplifiers to a larger area or a building complex, such as a sports stadium to sound an airport, a department store, etc. Since in addition to usual announcements, copywriting, background music, etc. in emergencies or disasters even vital calls on the speakers must be heard at each point of the system, it is necessary and in many cases prescribed by appropriate standards that the public address system regularly on their reliability is checked.
  • An object of the invention is to provide a method which takes into account the above-mentioned problems and which enables a particularly rapid and reliable detection of errors.
  • This object is achieved with a method of the aforementioned type, in which according to the invention a plurality of analog measured values of voltage and current are converted into digital signals and subjected to a Fourier transformation in order to determine an impedance to be compared with a reference value. Transformed values of current and voltage, a corresponding plurality of impedance values is determined, these impedance values are averaged and the resulting average is compared with a reference impedance value, wherein in deviation of the resulting average of the reference impedance value by a definable tolerance value issued an error signal becomes.
  • a single alternating voltage signal predetermined frequency of a speaker line via a power amplifier with a. Level is supplied, which is below the nominal operating level, and the AC signal has such a low frequency that a no or little perceptible to the human ear sound level is generated.
  • the impedance values obtained in this way have the advantage that they were measured under actual operating conditions.
  • this plurality of frequencies also contains the only low frequency in that a weighted mean value level is formed from the plurality of received signal signal levels obtained, and for each measurement the level of the single low-frequency measuring signal supplied to the loudspeaker line is set at a predefinable fixed distance to the weighted average level.
  • a degaussing signal of low frequency may be supplied to a loudspeaker line via a power amplifier having a level which rises to a maximum level and then falls again before a measurement.
  • impedance values can be determined over a wide frequency range, if at least one alternating voltage signal of predetermined frequency / frequencies is supplied to a loudspeaker line having a level which is selected such that the generated sound levels are not or barely perceptible to the human ear .
  • the determination of reference values can advantageously take place by supplying signals of different frequencies and / or levels in a learning phase of the loudspeaker line prior to the operation of the system, converting the measured values thereby obtained from current and voltage into digital signals and then subjecting them to a Fourier transformation and then from the current and voltage values reference values for different frequencies and / or levels are determined and stored.
  • the tolerance value is changed during operation to the effect that slow changes of actual impedances is a further tolerance range assigned to reference impedances as rapid changes.
  • the object underlying the invention is also provided with a device for monitoring loudspeaker lines by impedance measurement with at least one signal generator and controlled switches for supplying at least one alternating voltage signal of predetermined frequency to the input of at least one loudspeaker line, with measuring devices for measuring voltage and current solved at the entrance of the line and with at least one microprocessor, the latter using the above-mentioned features of the method controls the at least one signal generator to which the measured values of the measuring devices can be fed and to determine the input impedance to the line and to compare them with is set to a reference value and for outputting an error signal, if the determined impedance value deviates from a reference value within determinable tolerances.
  • FIG. 1 in a simplified block diagram of the basic structure of a measuring device according to the invention and
  • FIG. 2 shows a flowchart of the essential method steps of the method according to the invention.
  • FIG. 1 In the illustration of Fig. 1 three speaker lines of a public address system are outlined, but it should be clear that, depending on the type of system and a different number of speaker lines can be present.
  • a plurality of loudspeakers are connected to each line, with larger systems preferably employing a high-impedance, so-called "100 volt" variant, in which each loudspeaker lies above a transformer on the line.
  • a switch SCH power amplifier To an input of the speaker line can be switched via a switch SCH power amplifier, in the present case, for simplicity, only a power amplifier LEV is shown, which can be controlled by different audio sources AQL, AQ2, AQ3 to speech, music and warning signals to those of the Speakers supplied places to bring.
  • a signal generator SIG controlled by or part of a digital signal processor DSP may provide signals to the input of the power amplifier LEV, such as the output of the power amplifier LEV.
  • the measured values For measuring the current I and the voltage U at the output of the amplifier LEV or at the entrance of the speaker line current and voltage transformers are provided, the measured values, optionally supplied to the mentioned signal processor DSP after external A / D conversion.
  • each loudspeaker line can also be self-contained in the manner of a loop, and in this case the infeed does not take place at an "end" of the loudspeaker line both conductors at one point does not lead to failure of the speakers.
  • the signal generator SIG is used for large signal measurement with the aid of the power amplifier, another signal generator GEN is provided for a small signal measurement. This signal generator can also from the.
  • Signal processor DSP controlled or part of the same and provides signals to the input of the speaker line LLl, whose level is selected so that no or barely audible sound pressure levels are generated.
  • three frequencies namely 70 Hz, 250 Hz and 1 kHz, are used for the small-signal measurement.
  • the nominal (reference) values of the impedances are first determined in a learning phase, the nominal (reference) values of the impedances at different frequencies, in the present case, at least at the frequencies 23, 4375 Hz, 70 Hz, 250 Hz and 1 kHz.
  • the impedances are expediently also determined at different levels, since, for example, high levels result in different impedance values due to heating, in particular of voice coils, and due to nonlinearities in transformers and / or loudspeakers.
  • the same method can be used, which is used for determining the actual impedances.
  • the measured values of current and voltage are converted into digital signals at the stated different frequencies and levels and subjected to rapid Fourier transformation (FFT) in the digital signal processor DSP.
  • FFT rapid Fourier transformation
  • an FFT length or sample number of 2048 is used.
  • 50 readings are taken and then an average is formed from these values which, at least in the measurements in the learning phase, can be an arithmetic mean, but weighting at different frequencies or levels is also possible.
  • the determined reference values ZR23 / ZR7O, ZR250 / ZRIOOO / general ZRef are then stored in order to be available for the following measurements.
  • a useful signal i. H. a public address signal, such as. As music or speech, is present to perform either a large signal measurement or a small signal measurement.
  • a small-signal measurement is not expedient or would be very complicated because of the difficult-to-control level differences between a conventional measuring signal of low level (for example -6 dBu) and the useful signal level (for example + 42 dBu). Therefore, in this case, a higher signal level measurement is performed, but with the already mentioned low frequency f u of 23.4375 Hz, which is practically inaudible in normal operation.
  • the output signal of the signal generator SIG is supplied to the input of the power amplifier, which then feeds the loudspeaker line to be measured.
  • the signal level is chosen to be lower than the useful signal level so as not to overdrive the amplifier when the useful signal is already high, e.g. B. 13 dB below the Nutzsignalpegel.
  • an impedance Z to be compared with a reference value ZRef
  • several, e.g. 50 analog measurements of voltage and current are converted to digital signals, subjected to Fourier transform, and correspondingly many impedance values are determined from the transformed values of current and voltage.
  • An average value is formed from these impedance values and this is compared with a reference impedance value. If the resulting mean value deviates from the reference impedance value by a definable tolerance value, an error signal is emitted.
  • the large signal measurement offers the advantage that background noise does not affect the measurement results, since interference noise striking the loudspeaker diaphragms only produces signals whose level is far below the operating level. Also, the influence of the line length on the measurement result at the applied low measurement frequency is low.
  • the magnetic hysteresis of the iron core of transformers, the 100 volt line to the usually parentohrnigen, z. B. adapting 8 ohm speakers, at low frequencies can lead to significant changes in the measured impedance, so it is expedient to remove in the cores of the transformer existing remanences by a demagnetizing step. For this purpose, a demagnetization signal S E low frequency f ⁇ , z. B.
  • the demagnetization signal - like all other signals used here expediently a sinusoidal signal - rises from a zero level to a level which corresponds at least to the highest occurring operating level and then falls back to a zero level, to eliminate with certainty all remanence. In practice, a time of 1/3 second is sufficient for this process.
  • Another useful method step is that before a large-signal measurement, a practical level for the measurement signal is determined in the following manner: subject to the useful signal, which as already mentioned voice and / or music signals, but also other signals, such as alarm signals, may contain before the actual impedance measurement of a spectral analysis, again z. B. by a fast Fourier analysis in order to form a weighted average level from the determined level values at a plurality of frequencies, for example at 2048 frequency points, which should also contain at least the low measuring frequency f u used later. The level of the subsequently applied measurement signal is then automatically kept at a predeterminable distance from the determined level, proven at least 13 dB below it.
  • a kiemsignalflop can be performed if no useful signal is present, or if the measured speaker line is not switched to any amplifier.
  • the audio generator GEN is used, which - controlled by the processor DSP - generates signals of a specifiable frequency, for example 70 Hz, 250 Hz and 1000 Hz. These signals are applied in succession to the loudspeaker line to be measured, as well as in the large-signal measurement current and voltage continuously measured, the measured values are sampled and Fourier-transformed.
  • the digital signal processor DSP is also used.
  • the signal levels are chosen so that sound levels are generated at the respective frequencies, which are not audible to people in the sonicated areas or at least not perceived as disturbing.
  • the level selection is dependent on the frequency corresponding to the auditory curve, for a 100 volt system in practice voltage level in of the order of 300 to 400 mV at 70 Hz are typical. Demagnetization of the transmitter cores is generally not required for higher frequency signals.
  • a large number of measured values are determined in quick succession, for example 50 measured values per frequency again, and then averaged. In one embodiment, this measurement is done every 100 seconds. It is particularly expedient if a statistic is determined via the average values obtained as above and a moving average is formed therefrom.
  • the number of values averaged over (by moving average) is determined by the variance and the desired tolerance of the line.
  • the variance is the mean squared deviation of the measured values from their mean value.
  • d. H. each time the measured values fluctuate around their mean value, and the lower the desired tolerance, the more values must be averaged.
  • exponential moving averages are used, i. H. it is the current average with a certain factor ⁇ 1, z. For example: 0.1 multiplied and added to the current average multiplied by 1 minus this factor:
  • This moving average can then, for. B. every 100 s, with the reference (reference) value to be compared.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour le contrôle de lignes de haut-parleurs. Selon l'invention, au moins un signal de tension alternative de fréquence définie est appliqué à une ligne de haut-parleurs; la tension et le courant sont mesurés et l'impédance d'entrée sur la ligne est déterminée à partir de ces mesures et comparée à une valeur de référence; pour la détermination d'une impédance à comparer à une valeur de référence (ZRef), au cours d'un processus de mesure, une pluralité de valeurs de mesure analogiques de tension et de courant sont transformées en signaux numériques et ceux-ci sont soumis à une transformée de Fourier; à partir des valeurs de courant et de tension issues de la transformée de Fourier, une pluralité correspondante de valeurs d'impédance est déterminée; ces valeurs d'impédance sont soumises à une formation de valeur moyenne et la valeur moyenne résultante est comparée à une valeur d'impédance de référence; si la valeur moyenne résultante diffère de la valeur d'impédance de référence de l'ordre d'une valeur de tolérance définissable, un signal d'erreur est émis.
PCT/AT2007/000454 2006-09-28 2007-09-27 Procédé et dispositif de mesure pour le contrôle de systèmes de sonorisation WO2008036992A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07800194.8A EP2070388B1 (fr) 2006-09-28 2007-09-27 Procédé et dispositif de mesure pour le contrôle de systèmes de sonorisation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1618/2006 2006-09-28
AT0161806A AT504297B1 (de) 2006-09-28 2006-09-28 Verfahren und messeinrichtung zur überwachung von beschallungsanlagen

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WO2008036992A3 WO2008036992A3 (fr) 2008-10-30

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008057437A1 (de) 2008-11-14 2010-05-20 Gräf & Meyer GmbH Vorrichtung und Verfahren zur Kurzschlussisolation in Lautsprecherleitungen von elektroakustischen Anlagen
FR2958107A1 (fr) * 2010-03-26 2011-09-30 Finsecur Procede et dispositif de controle de haut-parleur
WO2011117557A3 (fr) * 2010-03-26 2011-11-24 Finsecur Procede et dispositif de controle de haut-parleur
US20140029754A1 (en) * 2010-10-04 2014-01-30 Novar Gmbh Method for operating a public address system
EP2884773A1 (fr) * 2013-12-10 2015-06-17 Televic Rail NV Système d'adresse publique
WO2016166025A1 (fr) * 2015-04-13 2016-10-20 Robert Bosch Gmbh Système audio, module d'étalonnage et procédé pour le fonctionnement, et programme informatique
WO2021008976A1 (fr) * 2019-07-15 2021-01-21 Robert Bosch Gmbh Dispositif d'évaluation et procédé d'analyse d'une installation de sonorisation ainsi qu'installation de sonorisation
WO2021030767A1 (fr) * 2019-08-14 2021-02-18 Dolby Laboratories Licensing Corporation Procédé et système pour surveiller et rapporter une santé de haut-parleur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514916B1 (de) * 2014-01-22 2015-05-15 Itec Tontechnik Und Industrieelektronik Ges M B H Verfahren und Einrichtung zum Überwachen einer Lautsprecheranlage
DE202015001656U1 (de) 2015-03-04 2015-03-24 Itec Tontechnik Und Industrieelektronik Gesellschaft M.B.H. Einrichtung zum Überwachen einer Lautsprecheranlage

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WO2001043303A2 (fr) * 1999-12-09 2001-06-14 Harris Corporation Detection de branchements en derivation par reflectometrie dans le domaine de frequence
US20060126857A1 (en) * 2004-12-15 2006-06-15 Motorola, Inc. Speaker diagnostics based upon driving-point impedance

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Publication number Priority date Publication date Assignee Title
CH659357A5 (en) * 1982-07-05 1987-01-15 Zellweger Uster Ag Method of balancing the electro-acoustic transmission factor of electro-dynamic converters, particularly for telephones
US5345510A (en) * 1992-07-13 1994-09-06 Rauland-Borg Corporation Integrated speaker supervision and alarm system
JPH10136493A (ja) * 1996-10-28 1998-05-22 Toa Corp スピーカラインの検査装置
JP2001036995A (ja) * 1999-07-21 2001-02-09 Toa Corp スピーカ回線の異常検知装置
WO2001043303A2 (fr) * 1999-12-09 2001-06-14 Harris Corporation Detection de branchements en derivation par reflectometrie dans le domaine de frequence
US20060126857A1 (en) * 2004-12-15 2006-06-15 Motorola, Inc. Speaker diagnostics based upon driving-point impedance

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008057437A1 (de) 2008-11-14 2010-05-20 Gräf & Meyer GmbH Vorrichtung und Verfahren zur Kurzschlussisolation in Lautsprecherleitungen von elektroakustischen Anlagen
DE102008057437B4 (de) * 2008-11-14 2012-08-30 Gräf & Meyer GmbH Vorrichtung und Verfahren zur Kurzschlussisolation in Lautsprecherringleitungen von elektroakustischen Anlagen
FR2958107A1 (fr) * 2010-03-26 2011-09-30 Finsecur Procede et dispositif de controle de haut-parleur
WO2011117557A3 (fr) * 2010-03-26 2011-11-24 Finsecur Procede et dispositif de controle de haut-parleur
US9049510B2 (en) 2010-03-26 2015-06-02 Finsecur Method and device for checking loudspeakers
US20140029754A1 (en) * 2010-10-04 2014-01-30 Novar Gmbh Method for operating a public address system
US9462401B2 (en) * 2010-10-04 2016-10-04 Novar Gmbh Method for operating a public address system
EP2884773A1 (fr) * 2013-12-10 2015-06-17 Televic Rail NV Système d'adresse publique
WO2016166025A1 (fr) * 2015-04-13 2016-10-20 Robert Bosch Gmbh Système audio, module d'étalonnage et procédé pour le fonctionnement, et programme informatique
CN107454974A (zh) * 2015-04-13 2017-12-08 罗伯特·博世有限公司 音频系统、校准模块、运行方法和计算机程序
US20180124542A1 (en) * 2015-04-13 2018-05-03 Robert Bosch Gmbh Audio system, calibration module, operating method, and computer program
US10225678B2 (en) 2015-04-13 2019-03-05 Robert Bosch Gmbh Audio system, calibration module, operating method, and computer program
WO2021008976A1 (fr) * 2019-07-15 2021-01-21 Robert Bosch Gmbh Dispositif d'évaluation et procédé d'analyse d'une installation de sonorisation ainsi qu'installation de sonorisation
US11985491B2 (en) 2019-07-15 2024-05-14 Robert Bosch Gmbh Evaluation device and method for analyzing a public address system, and public address system
WO2021030767A1 (fr) * 2019-08-14 2021-02-18 Dolby Laboratories Licensing Corporation Procédé et système pour surveiller et rapporter une santé de haut-parleur
CN114223218A (zh) * 2019-08-14 2022-03-22 杜比实验室特许公司 用于监测和报告扬声器健康状况的方法和系统
US12003927B2 (en) 2019-08-14 2024-06-04 Dolby Laboratories Licensing Corporation Method and system for monitoring and reporting speaker health

Also Published As

Publication number Publication date
WO2008036992A3 (fr) 2008-10-30
EP2070388B1 (fr) 2018-05-23
EP2070388A2 (fr) 2009-06-17
AT504297B1 (de) 2009-11-15
AT504297A1 (de) 2008-04-15

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