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EP1519618B1 - Procédure et appareil de communication avec des moyens pour supprimer les interférences des signaux audio - Google Patents

Procédure et appareil de communication avec des moyens pour supprimer les interférences des signaux audio Download PDF

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Publication number
EP1519618B1
EP1519618B1 EP03021578A EP03021578A EP1519618B1 EP 1519618 B1 EP1519618 B1 EP 1519618B1 EP 03021578 A EP03021578 A EP 03021578A EP 03021578 A EP03021578 A EP 03021578A EP 1519618 B1 EP1519618 B1 EP 1519618B1
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EP
European Patent Office
Prior art keywords
communication device
previous
algorithm
audio signals
reverberation time
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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
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EP03021578A
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German (de)
English (en)
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EP1519618A1 (fr
Inventor
Frank Lorenz
Christoph Dr. Pörschmann
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Hewlett Packard Development Co LP
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Hewlett Packard Development Co LP
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Priority to AT03021578T priority Critical patent/ATE532346T1/de
Priority to EP03021578A priority patent/EP1519618B1/fr
Priority to PCT/EP2004/008999 priority patent/WO2005041615A1/fr
Publication of EP1519618A1 publication Critical patent/EP1519618A1/fr
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Publication of EP1519618B1 publication Critical patent/EP1519618B1/fr
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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • 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 operating a communication device, wherein the communication device radiates audio signals to an environment and on the one hand resumes these audio signals including ambient superimposed interference components containing at least echo and reverberation and on the other hand audio signals of an external sound source, preferably a Merixationstechnikutzers, including their ambient Disturbance components, and the resumed audio signals are used by a first algorithm to determine a room impulse response of the environment.
  • the invention relates to a communication device with means for interference suppression of audio signals, wherein the communication device has at least one speaker which radiates audio signals to an environment and further comprises at least one microphone, on the one hand with these audio signals including ambient superimposed interference components, the at least echo and Reverberation be included and on the other hand audio signals of an external sound source, preferably a communication device user, including their environmental interference components, recorded, and in the communication device, a first means is provided having a means for calculating a room impulse response of the environment.
  • the type and duration of the reverberation are decisively influenced by the geometry of the room and the condition of the walls.
  • the reverberation time has hitherto been determined by two types of methods, namely by statistical estimation methods or by a method which uses one or more measuring signals.
  • an information averaged over many speakers and speech examples on the time and amplitude ratio of speech sections to speech pauses is used to obtain a statement about the reverberation time via the change of this ratio in comparison to the value in unvoiced speech.
  • a measurement signal for example white noise, which is known to the system must be played via an external sound source.
  • the correlation between the reproduced measurement signal and the signal, which is received again via the microphone of the communication device, can then be used to estimate the reverberation time T60.
  • This option is at most practicable for experimental setups, since, for example, the user of a telephone can not be expected to perform such a measurement before or during each conversation with the telephone.
  • D1 US 4,066,842 shows a signal processing system for deriving a noise-reduced output signal from two supplied signals, in particular to reduce the reverberation and interference in audio frequency systems, such as those used in telephone hands-free systems.
  • the inventors have recognized that information contained in the room impulse response can also be used to suppress other audio signals.
  • the spatial impulse response can be obtained by a known method.
  • the room impulse response calculated by the Acoustic Echo Cancelation method wherein the AEC method is already present in many telephones and which uses this room impulse response to suppress the resumed audio signals, can also be used to determine the reverberation time of the environment.
  • the audio signal radiated by a first communication device in hands-free mode usually the voice of the communication device user of the second communication device, including the interference components caused by the environment of the first communication device, is picked up again by the microphone of the first communication device first determine the spatial impulse response with these audio signals using a first algorithm.
  • the room impulse response implicitly includes the reverberation time T60, ie the reverberation time can be calculated from it.
  • the reverberation time of the room is determined from the room impulse response already determined by the first algorithm. This reverberation time can then be used to determine the reverberation in the recorded speech signal of the first communication device user.
  • the inventors additionally make use of the knowledge that the reverberation time does not change significantly even at different positions of the sound source in the room.
  • the inventors propose a method for operating a communication device, wherein the communication device radiates audio signals to an environment and on the one hand resumes these audio signals including ambient superimposed interference components containing at least echo and reverberation and on the other hand audio signals of an external sound source, preferably a Merixationsmaschineutzers including its environmental disturbance components, and a first algorithm determines a room impulse response of the environment to improve on the recorded audio signals of the external sound source, preferably the communication device user, using a second suppression algorithm which uses a reverberation time for suppression; which he determines from the space impulse response determined by the first algorithm.
  • the communication device radiates audio signals to an environment and on the one hand resumes these audio signals including ambient superimposed interference components containing at least echo and reverberation and on the other hand audio signals of an external sound source, preferably a Medunikations confuseers including its environmental disturbance components
  • a first algorithm determines a room impulse response of the environment to improve on the recorded audio signals of the external sound source, preferably the communication
  • the method is particularly well suited for communication devices, such as for radios, mobile devices or landline telephones, since just here the possibility of radiation of a known signal and the subsequent recording is given. But also for stand-alone devices that can output audio signals via a speaker and can also record audio signals via a microphone, the method is suitable to use the resulting by the environmental condition of the stand-alone device reverberation time and to suppress interference.
  • the determination of the reverberation time via this method is much more accurate, as compared to a previous estimate from the reverberant audio signal.
  • the new method can provide the basis for real-time parameterization and real-time adaptation of speech reverberation algorithms.
  • the reverberation time is calculated from the energetic decay of the reverberation, whereby the information about the speed of this decay is contained in the spatial impulse response. This allows a more accurate determination of the reverberation time compared to the statistically based estimation of the reverberation time.
  • an AEC (Acoustic Echo Cancellation) algorithm can be used in the new method in the first algorithm.
  • This AEC algorithm is already present in many telephones and is actually used to suppress the resumed audio signals.
  • the algorithm calculates a room impulse response, which according to the invention can be used to determine the reverberation time.
  • a second suppression algorithm is used.
  • Such a second interference suppression algorithm is intended to exploit the determined or assumed reverberation time for the ambient superimposed interference components, such as echo and reverb, Remove from the recorded audio signal of the communication device user.
  • the spatial impulse response is filtered as a function of the frequency and preferably by a plurality of bandpass filters.
  • the reverberation time which itself is frequency-dependent, can be determined as a function of the frequency.
  • the application of the new method can be very easily detected in two communication devices: The method described for operating a communication device based on the fact that the speaker of an audio system, for example, radiates into a room and that reverberated through the room Audio signal is recorded again from the microphone of the audio system.
  • the inventors also propose a known communication device with means for interference suppression of audio signals, wherein the communication device has at least one speaker, the audio signals radiates to an environment and further comprises at least one microphone with which on the one hand these audio signals including ambient superimposed interference components containing at least echo and reverberation are resumed and on the other hand audio signals of an external sound source, preferably a Merunikations confuseers, including their environmental interference components are added, and in the communication device a first means is provided, which has a means for calculating a room impulse response of the environment, in that a second means for the recorded audio signals of the external sound source, preferably the communication device user, including their environmental disturbance parts is arranged, which is a means for Determining the reverberation time, which determines the reverberation time, which is included in the space impulse response determined by the first means.
  • the communication device has at least one speaker, the audio signals radiates to an environment and further comprises at least one microphone with which on the one hand these audio signals including ambient superimposed interference components
  • a communication device in which the reverberation time, which was determined by the utilization of the radiation of a known audio signal and the subsequent recording of the reverberated in the audio signal on the determination of the room impulse response, which now also for the interference suppression of the audio signals of an external Sound source can be used.
  • the interference suppression can be done more accurately than before, as the reverberation time is better and more accurately determined.
  • the first means has program means and / or program modules which determine the reverberation time.
  • the second means may have program means and / or program modules which determine the reverberation time.
  • the first means may include program means and / or program modules having an AEC (Acoustic Echo Cancellation) algorithm or an algorithm as described in Welch, PD [1970], The Use of Fast Fourier Transform for the Estimation of Power Spectra , IEEE Trans Audio Electroacoustic, Vol AU15, pp70-73). The content of this literature reference is incorporated in full.
  • AEC Acoustic Echo Cancellation
  • the second means have program means and / or program modules which execute an algorithm which removes the ambiently superimposed interference components, such as echo and reverb, from the recorded audio signal of the communication device user by utilizing the ambiently determined reverberation time.
  • the determination of the reverberation time as a function of the frequency and correspondingly the frequency-dependent interference suppression of the audio signals is implemented favorably in the communication device if bandpass filters are arranged in the communication device which filter the spatial impulse response.
  • the new communication device may be a telephone, for example in the form of a mobile radio terminal or a wired telephone, an electric household appliance or an electric module of a vehicle with means for voice input and voice output.
  • FIG. 1 shows by way of example in a diagram the temporal energy distribution of an audio signal which can be recorded and measured in a room with a microphone when a pulse-like audio signal, for example a bang, occurs.
  • This power distribution is obtained by entering the magnitude square forms a room impulse response and this logarithmiert.
  • the reverberation 3 follows, which consists of quasi-chaotic superimposed reflections of the audio signal in space and diffusely arrives at the measuring microphone.
  • the new method uses the reverberation time T60 of an audio signal determined from the spatial impulse response 14 that is characteristic of a particular room.
  • an energy range A60 which is in the range of the reverberation 3, in which the energy of the reverberation drops by 60 decibels.
  • the upper and lower limits of the energy range A60 are first projected on the reverberation curve 3 and then on the abscissa, ie the time axis.
  • the projected area on the time axis corresponds to the reverberation time T60.
  • the energy range does not necessarily have to be chosen to be 60 decibels, but can also be chosen to be smaller or larger.
  • an area may be chosen in which the energy of the Reverberation drops by 30 decibels, for example.
  • the value obtained from the projection on the time axis must be adjusted accordingly by the factor of reduction / increase of the energy. With an energy range of only 30 decibels, the time period is multiplied by a factor of 2 to obtain the reverberation time T60.
  • FIG. 2 again the example of the temporal energy distribution of a pulse-like audio signal, for example a bang is shown.
  • the audio signal should be recorded in a smaller space. This manifests itself in a lower reverberation 3.
  • the reverberation curve 3 falls off faster, whereby the reverberation T60 less than in FIG. 1 is.
  • the direct sound 1 and the echoes 2 in the diagram of FIG. 2 unchanged from the diagram of FIG. 1 accepted. In a real measurement of a signal, however, differences could occur here.
  • the reverberation time T60 can be determined from the energy waste of the reverberation 3, that is to say the negative slope of the reverberation curve 3.
  • FIG. 3 now shows a measured room impulse response 14 of a room.
  • On the ordinate are the signal amplitudes and on the abscissa the time is plotted.
  • the rate of energy decay in the room impulse response over time is characteristic of that particular space. This speed will be obtained regardless of the measurement signal and the position of the sound source and microphone in the room for that particular room.
  • the FIG. 4 shows two communication devices 13.1 and 13.2, the signals 4 and 12 via an interface 13.3 exchange.
  • the communication devices 13.1 and 13.2 may be, for example, terminals in the mobile radio network.
  • the interface 13.3 may be, for example to act a transmitting / receiving antenna or an infrared interface.
  • the new method is used.
  • the first communication device 13.1 is said to be in an environment, for example, a church where reverberation effects occur. This environment is indicated by a unilaterally open rectangle with the reference numeral 9.
  • the signal 4 is sent via the interface 13.3 from the second communication device 13.2 to the first communication device 13.1 and received by the latter.
  • the signal 12 is to be sent from the first communication device 13.1 to the second communication device 13.2, thereby disturbances that occur through the environment 9 of the first communication device 13.1, are suppressed.
  • the first communication device 13.1 has at least one digital-to-analog converter 6, which converts the digital signals 4 sent by the second communication device 13.2 into analog signals and forwards them to a loudspeaker 7.
  • the first communication device 13.1 has a microphone 10, which can record analog signals and digitized via an analog-to-digital converter 11.
  • the already known reverberation time is made available for the suppression of the signal 15.1 as follows.
  • the signal 4 sent by the second communication device 13.2 is converted by the digital-to-analog converter 6 and output via the loudspeaker 7 of the first communication device 13.1.
  • Analogous to the diagrams of Figures 1 and 2 the signal 4 in the form of direct sound 8.1, echo 8.2 and reverberation 8.3 can reach the microphone 10 of the first communication device 13.1.
  • the direct sound 8.1, the echo 8.2 and the reverberation 8.3 are converted via an analog-to-digital converter 11 and an algorithm 5 determines the room impulse response.
  • AEC Acoustic Echo Cancellation
  • Welch a well-known algorithm first published by “Welch” may be used to determine the spatial impulse response.
  • Welch a well-known algorithm first published by “Welch”
  • Welch method describes the determination of an impulse response by the emission of a Output signal and the measurement of the input signal. The only requirement for the output signal is the presence of sufficient energy in the frequency ranges to be considered.
  • the reverberation time can be determined from this.
  • This reverberation time can also be used for the interference suppression of the signal 15.1 of the communication device user 15, since the reverberation times, which are responsible for the transmission of signals 8.1 to 8.3 from the speaker 7 through the environment 9 to the microphone 10 and for the transmission of signals 15.1 to 15.3 from Communication device user 15 to the microphone 10, are similar.
  • a further algorithm 16 is provided which has access to the data of the algorithm 5, thus also to the room impulse response and the reverberation time contained therein. Then the signals 15.1 to 15.3 are suppressed with a suppression unit 17 and output as signals 12.
  • FIG. 5 shows a particular embodiment of a communication device.
  • the new method is used in a voice operated electric appliance 13.4.
  • the operator 15 of the voice-controlled electrical appliance is only in contact with the voice-controlled electrical appliance 13.4 and not as such in FIG. 4 with another communication participant, who is located at a second communication device.
  • the voice-controlled electrical appliance 13.4 has a voice generation module 18 in order to be able to output signals 4.1, for example the menu size of the electrical appliance 13.4, via the loudspeaker 7.
  • the voice-controlled electrical appliance 13.4 has a voice recognition module 19 in order to be able to recognize signals 12.1, for example the language of the operator 15.
  • the signals output via the loudspeaker 7 in the form of direct sound 8.1, reverberation 8.2 and reverberation 8.3 can be picked up unintentionally by the microphone 10.
  • an algorithm 5 is executed in the voice-controlled electrical appliance 13.4, which among other things also determines the room impulse response. In addition, this feedback is suppressed with a Entstörtician 17.
  • the algorithm 5 can not be used. But the reverberation time, which can be calculated from the room impulse response, which was determined in the algorithm 5, but almost equally applies to the signals 15.1 to 15.3 of the operator 15, can be used by another algorithm 16, the signal with a de-interference unit 17 15.1 suppressed.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Noise Elimination (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Transceivers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (18)

  1. Procédé pour assurer le fonctionnement d'un appareil de communication (13.1, 13.2, 13.4), dans lequel
    l'appareil de communication (13.1, 13.2, 13.4) émet des signaux audio (8.1 à 8.3) à un environnement (9) et enregistre, d'une part, à nouveau lesdits signaux audio (8.1 à 8.3), y compris des fractions parasites superposées dues à l'environnement, qui englobent au moins l'écho (8.2) et la réverbération (8.3), et
    enregistre, d'autre part, des signaux audio (15.1 à 15.3) d'une source sonore externe, de préférence d'un utilisateur (15) de l'appareil de communication, y compris leurs fractions parasites (15.2 et 15.3) dues à l'environnement, et
    les signaux audio (8.1 à 8.3) enregistrés à nouveau sont utilisés par un premier algorithme (5) pour déterminer une réponse impulsionnelle spatiale de l'environnement,
    caractérisé en ce qu'un deuxième algorithme de déparasitage (16) est appliqué aux signaux audio (15.1 à 15.3) enregistrés en provenance de la source sonore externe, de préférence de l'utilisateur (15) de l'appareil de communication, et qui, pour assurer le déparasitage, utilise un temps de réverbération (T60) qu'il établit à partir de la réponse impulsionnelle spatiale (14) déterminée par le premier algorithme (5).
  2. Procédé selon la revendication précédente 1,
    caractérisé en ce que c'est uniquement le premier algorithme (5) qui détermine le temps de réverbération (T60).
  3. Procédé selon la revendication précédente 1,
    caractérisé en ce que c'est uniquement le deuxième algorithme de déparasitage (16) qui détermine le temps de réverbération (T60).
  4. Procédé selon l'une des revendications précédentes 1 à 3,
    caractérisé en ce que le temps de réverbération (T60) est calculé à partir de la dégradation énergétique de la réverbération (8.3) dans la réponse impulsionnelle spatiale (14).
  5. Procédé selon l'une des revendications précédentes 1 à 4,
    caractérisé en ce que l'on utilise un algorithme AEC (5) (AEC = Acoustic Echo Cancellation = annulation d'écho acoustique) en guise de premier algorithme.
  6. Procédé selon l'une des revendications précédentes 1 à 5,
    caractérisé en ce que le deuxième algorithme de déparasitage (16) élimine les fractions parasites superposées (15.2 et 15.3) du signal audio (15.1 à 15.3) enregistré en provenance de la source sonore externe, en exploitant le temps de réverbération (T60) déterminé ou relevé en fonction de l'environnement.
  7. Procédé selon l'une des revendications précédentes 1 à 6,
    caractérisé en ce que la réponse impulsionnelle spatiale (14) est filtrée, de préférence à l'aide de filtres passe-bande, pour déterminer le temps de réverbération (T60) en fonction de la fréquence.
  8. Appareil de communication (13.1, 13.2, 13.4) comprenant des moyens pour le déparasitage de signaux audio,
    l'appareil de communication (13.1, 13.2, 13.4) disposant d'au moins un haut-parleur (7) qui émet des signaux audio (8.1 à 8.3) à un environnement (9), et présentant, de plus, au moins un microphone (10) à l'aide duquel on enregistre, d'une part, à nouveau lesdits signaux audio (8.1 à 8.3), y compris des fractions parasites superposées dues à l'environnement, qui englobent au moins l'écho (8.2) et la réverbération (8.3), et
    on enregistre, d'autre part, des signaux audio (15.1 à 15.3) d'une source sonore externe, de préférence d'un utilisateur (15) de l'appareil de communication, y compris leurs fractions parasites (15.2 et 15.3) dues à l'environnement, et
    dans ledit appareil de communication (13.1, 13.2, 13.4) est prévu un premier moyen (5) qui comprend un moyen pour calculer une réponse impulsionnelle spatiale de l'environnement,
    caractérisé en ce qu'un deuxième moyen (16) est agencé pour les signaux audio (15.1 à 15.3) enregistrés en provenance de la source sonore externe, de préférence de l'utilisateur (15) de l'appareil de communication, y compris leurs fractions parasites (15.2, 15.3) dues à l'environnement, et qui comprend un moyen pour établir le temps de réverbération (T60), qui établit le temps de réverbération (T60) contenu dans la réponse impulsionnelle spatiale (14) déterminée par le premier moyen (5).
  9. Appareil de communication (13.1, 13.2, 13.4) selon la revendication précédente 8,
    caractérisé en ce que c'est uniquement le premier moyen (5) qui présente des moyens de programme et/ou des modules de programme qui déterminent le temps de réverbération (T60).
  10. Appareil de communication (13.1, 13.2, 13.4) selon la revendication précédente 8,
    caractérisé en ce que c'est uniquement le deuxième moyen (16) qui présente des moyens de programme et/ou des modules de programme qui déterminent le temps de réverbération (T60).
  11. Appareil de communication (13.1, 13.2, 13.4) selon l'une des revendications précédentes 8 à 10,
    caractérisé en ce que les moyens de programme et/ou les modules de programme du premier moyen renferment un algorithme AEC (5) (AEC = Acoustic Echo Cancellation = annulation d'écho acoustique).
  12. Appareil de communication (13.1, 13.2, 13.4) selon l'une des revendications précédentes 8 à 11,
    caractérisé en ce que les moyens de programme et/ou les modules de programme du deuxième moyen (16) renferment un algorithme qui, en exploitant le temps de réverbération déterminé en fonction de l'environnement, élimine les fractions parasites superposées (15.2 et 15.3) du signal audio (15.1 à 15.3) enregistré en provenance de la source sonore externe (15).
  13. Appareil de communication (13.1, 13.2, 13.4) selon l'une des revendications précédentes 8 à 12,
    caractérisé en ce que des filtres passe-bande sont prévus qui filtrent la réponse impulsionnelle spatiale (14) et permettent la détermination du temps de réverbération (T60) en fonction de la fréquence.
  14. Appareil de communication (13.1, 13.2, 13.4) selon l'une des revendications précédentes 8 à 13,
    caractérisé en ce que l'appareil de communication (13.1, 13.2, 13.4) est un téléphone.
  15. Appareil de communication (13.1, 13.2, 13.4) selon la revendication précédente 14,
    caractérisé en ce que l'appareil de communication (13.1, 13.2, 13.4) est un téléphone filaire.
  16. Appareil de communication (13.1, 13.2, 13.4) selon l'une des revendications précédentes 8 à 14,
    caractérisé en ce que l'appareil de communication (13.1, 13.2, 13.4) est un terminal de radiocommunication mobile.
  17. Appareil de communication (13.1, 13.2, 13.4) selon l'une des revendications précédentes 8 à 13,
    caractérisé en ce que l'appareil de communication (13.1, 13.2, 13.4) est un appareil électrique domestique comprenant des moyens d'entrée vocale et des moyens de sortie vocale.
  18. Appareil de communication (13.1, 13.2, 13.4) selon l'une des revendications précédentes 8 à 17,
    caractérisé en ce que l'appareil de communication (13.1, 13.2, 13.4) est un module électrique d'un véhicule, comprenant des moyens d'entrée vocale et des moyens de sortie vocale.
EP03021578A 2003-09-24 2003-09-24 Procédure et appareil de communication avec des moyens pour supprimer les interférences des signaux audio Expired - Lifetime EP1519618B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT03021578T ATE532346T1 (de) 2003-09-24 2003-09-24 Verfahren und kommunikationsgerät mit mitteln zur entstörung von audiosignalen
EP03021578A EP1519618B1 (fr) 2003-09-24 2003-09-24 Procédure et appareil de communication avec des moyens pour supprimer les interférences des signaux audio
PCT/EP2004/008999 WO2005041615A1 (fr) 2003-09-24 2004-08-11 Procede et dispositif de communication associe pourvu de moyens de deparasitage de signaux audio

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Application Number Priority Date Filing Date Title
EP03021578A EP1519618B1 (fr) 2003-09-24 2003-09-24 Procédure et appareil de communication avec des moyens pour supprimer les interférences des signaux audio

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EP1519618A1 EP1519618A1 (fr) 2005-03-30
EP1519618B1 true EP1519618B1 (fr) 2011-11-02

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EP03021578A Expired - Lifetime EP1519618B1 (fr) 2003-09-24 2003-09-24 Procédure et appareil de communication avec des moyens pour supprimer les interférences des signaux audio

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066842A (en) * 1977-04-27 1978-01-03 Bell Telephone Laboratories, Incorporated Method and apparatus for cancelling room reverberation and noise pickup
US5263019A (en) * 1991-01-04 1993-11-16 Picturetel Corporation Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone
JP3344864B2 (ja) * 1995-03-13 2002-11-18 日本放送協会 残響時間自動測定方法および残響時間自動測定装置

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ATE532346T1 (de) 2011-11-15
WO2005041615A1 (fr) 2005-05-06
EP1519618A1 (fr) 2005-03-30

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