EP2416593A1 - Procédé de communication à l'intérieur d'une pièce - Google Patents

Procédé de communication à l'intérieur d'une pièce Download PDF

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Publication number
EP2416593A1
EP2416593A1 EP10171617A EP10171617A EP2416593A1 EP 2416593 A1 EP2416593 A1 EP 2416593A1 EP 10171617 A EP10171617 A EP 10171617A EP 10171617 A EP10171617 A EP 10171617A EP 2416593 A1 EP2416593 A1 EP 2416593A1
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Prior art keywords
gain
communication system
indoor communication
signal
noise
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EP10171617A
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German (de)
English (en)
Inventor
Patrick Hannon
Bernd Iser
Mohamed Krini
Gerhard Schmidt
Arthur Wolf
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SVOX AG
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SVOX AG
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the invention relates to an interior communication system, in particular for vehicles.
  • ICC systems indoor communication systems
  • microphones, signal processing devices and speakers are used so that speech signals of the microphones are processed and selectively supplied to the passengers via the speakers.
  • part of the signals emitted via the loudspeakers is picked up by the microphones, which can lead to feedback.
  • a first group of solutions ( DE 19958836 and WO 2009/100968 ) provides different presets for the optimization of the signal processing, so that situational such a presetting can be selected.
  • a second set of approaches ( US 2005/0276423 ; A. Ortega, E. Lleida, E. Masgrau, F. Gallego: Cabin car communication system to improve communication inside a car, Proc. ICASSP '02, 4, 3836-3839, Orlando, FL, USA, 2002 ; K. Linhard, J. Freueberger: Passenger in-car communication enhancement, Proc.
  • EUSIPCO '04, 1, 21-24, Vienna, Austria, 2004 includes various filter solutions which process the signals of the microphones with filters to avoid feedback.
  • a third group of solutions ( DE 4202609 ) sets the gain based on a comparison between a given test signal and the associated received signal. The disadvantage of all three approaches is that only individual components are considered and not the entire feedback system and therefore the communication conditions can not be fine tuned enough and therefore there is often insufficient support for the communication.
  • An indoor communication system forms a closed electroacoustic loop with the microphones used, the speakers and the vehicle interior. Due to this feedback is the maximum gain of the system limited. For a good system support of the passengers, the system gain should be as high as possible, this makes operation near the stability limit necessary. For this, a permissible maximum gain must be determined.
  • the interior communication components installed in the vehicle and used are subject to tolerances and fluctuations due to their manufacture and installation. This means for the indoor communication system that it should preferably be calibrated before the first operation in the vehicle to compensate for these tolerances and to determine the vehicle-specific maximum gain. In addition to the maximum gain, the sound of the playback is critical to system quality.
  • each system should preferably be adapted to it before operation. It is therefore preferred that a reference frequency response in the vehicle-specific interior reference system is determined such that the system operates stably at high amplification.
  • the reference frequency response is used in the determination of the equalizer filter.
  • This frequency-dependent adjustment of the signal processing device should preferably be carried out as a first-time default preferably before operation at the end of the tape or after changes to the audio system also in the workshop. Even later in the operation, there are still changes to the system, eg due to aging, temperature dependence, component failure and room changes.
  • a classic system identification is possible during the indoor communication system operation due to the strong correlation between the microphone and loudspeaker signal and the constant intercom situation only with special measures. Should these changes and variations still be detected and the calibration performed for maximum gain and equalization to the reference frequency response, the system may also be identified outside the indoor communication mode. For this purpose different signals can be used during different scenarios. Subsequently, these results can be adopted for indoor communication operation. Should the system quality not be sufficient for the vehicle occupants after the first two steps, the interior communication system can be adjusted according to the needs of the passengers, supported by a speech dialogue while driving, which can also be simulated. The requirements of the speaker and the audience regarding the system quality must be taken into account.
  • the indoor communication system is extended by a system identification and measurement signal output in order to be able to determine the impulse response of the feedback. It is necessary for the system calibration to know the entire system h LM, i (n), including microphones, speakers and vehicle interior. This measurement must be performed for each speaker-microphone combination. n here is the time index.
  • the index i stands for the respective speaker-microphone pair.
  • the indoor communication system includes a plurality of speakers and microphones. For ease of illustration, the index i is omitted. This adjustment of the signal processing device can be performed at the end of the tape, in the workshop or initiated by the vehicle occupants.
  • the signal processing device is set prior to the first calibration by an output setting of the gain.
  • the impulse response h LM (n) By a suitable measurement one obtains the impulse response h LM (n).
  • H LM (e j ⁇ , n) of the indoor communication system By a transformation into the frequency range, one obtains the transfer function H LM (e j ⁇ , n) of the indoor communication system , which is used for the actual calibration.
  • the system calibration is based on at least one determined impulse response h LM (n), which is determined as part of a system identification.
  • a broadband excitation signal is used for the system identification or the measurement of the impulse response h LM (n). This - known to the measuring system - test signal is played through the speakers and evaluated together with the microphone signals.
  • test signals can be used for the system identification of the loudspeaker microphone system h LM (n), eg noise.
  • white noise or pseudo random noise are well suited for this purpose.
  • Conceivable are other signals, such as standard signals of the vehicle interior acoustics, such as music playback, voice playback when making a call, voice output of a dialogue system or audible warning signals. This signal is played back sequentially through each speaker and recorded by the microphones used. From this, the respective impulse response h LM (n) can then be determined.
  • the system identification can be performed separately for each individual speaker-microphone pair or together for a group of speakers, microphones.
  • the need for a common evaluation may be due to the audio system, for example, if it is not possible to address the speakers individually (both hat shelf speakers are connected in parallel, both door speakers - tweeters, woofers - are connected in parallel).
  • the cross-correlation between input and output signal can be used for system identification.
  • an adaptive filter can be used for system identification. If the quality of the measurement is sufficiently good, the measurement is used for further evaluations. After the impulse response h LM (n) has been determined with sufficient quality, it must be evaluated for the calibration.
  • the following system variables can be used for this: Subfrequency band gains, propagation time, reverberation time.
  • the reference frequency response H REF (e j ⁇ , n) was determined on a reference vehicle .
  • the indoor communication system had a fixed system running time and a fixed reverberation time (depending on the hardware used, the feedback and the gain). For the system to be calibrated, these variables may differ from the reference system. But they are important for the acoustic speaker localization and the sound quality of the indoor communication system.
  • the precedence effect also called law of the first wavefront
  • Haas effect is exploited.
  • Haas showed that the law of the first wavefront works even when the level of the delayed incoming sound is up to 10 dB higher than that of the first wavefront. Exactly the same is the case with an indoor communication system, while the delayed system reproduction may be louder than the direct sound, the acoustic localization nevertheless remains to a certain extent.
  • the relationship between the gain of the delayed signal (indoor communication system output) versus the first wavefront (direct sound of the speaker) is dependent on this delay. As the delay increases, the allowable gain is lower.
  • the effect of the delay on the speaker's location in an indoor communication system can be determined for an indoor communication reference system by listening tests. The amplification is determined at which the localization of the speaker no longer works properly.
  • the reverberation time T60 is defined as the time required for the energy of the impulse response to drop by 60 dB, and can be derived directly from the energy decay behavior the impulse response are determined.
  • the energy decay curve EDC is calculated from the impulse response h (n) with the length of L samples. In general, the energy in the space falls exponentially over time, which is why it decreases linearly in logarithmic representation, see also Fig. 9 , If the logarithmic energy decay curve is approximated by a straight line, the approximate decay behavior in [dB / s] can be determined directly from the slope of the straight line. From this slope, the time can be determined, which is needed until the energy has dropped by 60 dB.
  • the reverberation time T60 in the vehicle is relatively short at approx. 50 ms. Due to the closed electroacoustic loop, the energy decays more slowly because the delayed feedback components are added.
  • the system gain is adjusted by correction factors based on the psychoacoustic effects, based on the system runtime and the reverberation time.
  • the propagation times and / or reverberation times taking into account the Haas effect, which denotes delay-dependent level differences when listening to a first wavefront (direct sound) and a delayed sound (amplified wavefront), are detected and used to set the system gain.
  • System identification may occur inside or outside the operation of the indoor communication system.
  • the signals may be only weakly decorrelated.
  • the poor signal-to-noise ratio between the feedback indoor communication system (signal) reproduced signal and disturbances such as the speaker signal and the background noise caused by engine, tire rolling and wind noise are aggravated.
  • the system identification is slow and over a longer period of time. After successful system identification, the setting parameters are determined and adopted by the indoor communication system.
  • the system identification by the indoor communication system output signal is difficult. Instead, during speech pauses, artificial noise can be played through the speakers and used for system identification.
  • the "coloring" of the noise should be adjusted so that it is as similar as possible to the real background noise. In order not to disturb the vehicle occupants by the noise, this signal may only be reproduced at a low level. Due to the low signal power, the system identification is very slow and over a longer period. After successful system identification, the setting parameters are determined and adopted by the indoor communication system.
  • the test signal is noise.
  • a standard signal which is played back either during the operation of the indoor communication system or outside the operation of the indoor communication system and used for system identification.
  • This may be, for example, music playback, voice playback when making a call, the voice output of the dialogue system or other acoustic signals, such as the parking aid warning signal.
  • It can also be an artificial background noise, for example, generated in speech pauses, which is preferably similar to the background noise, so that it is perceived as little as possible by the audience.
  • the triggering of the calibration can be initiated on the one hand by the user, but can also be initiated in the background, for example by detecting deviations of the estimated impulse responses.
  • the benefit of user initiated system identification is that it results in high quality measurement results.
  • the disadvantage is that these once determined parameters remain unchanged until the new measurement and can not be responded to system changes during operation (different number of passengers, loudspeaker-covering objects in the interior).
  • An improvement brings a working in the background (imperceptible to the vehicle occupants) system identification.
  • the system identification working in the background should monitor the system behavior. Small changes in the estimated speaker-microphone impulse response should track the calibration of the indoor communication system. If larger deviations from the calibration measurement are detected (objects obscure speakers, failure of audio hardware components), an error message is automatically output and a new basic calibration of the system is required.
  • background detection may occur in an indoor communication echo canceller. At least one such echo canceller is preferably part of the indoor communication signal processing in the vehicle and is also evaluated for the system setting, wherein the evaluation takes place outside or during the operation of the indoor communication system.
  • the quality of the measurement of the impulse response In order to achieve the best possible calibration of the indoor communication system for the listener and speaker, it is expedient to analyze the quality of the measurement of the impulse response. In the case of insufficient quality of the measurement, an error analysis is performed. When detecting failed and poorly adjusted system components, the system behavior is adjusted. In this case, the microphone signal recorded during the measurement and the sensor signals of the vehicle stored during the measurement are analyzed for the error analysis of the measurement carried out. A successful adjustment of the adaptive filter can only be done with a sufficiently strong signal level (level of the microphone signal). If this level is too low, it means that either the playback side (amplifier, loudspeaker) or the reception side (microphone, amplifier) is defective.
  • level of the microphone signal level of the microphone signal
  • the control of the noise-dependent gain gNDGC takes over the NDGC module (noise dependent gain control).
  • a user-specific adjustment of the noise-dependent gain characteristic is performed and stored user-specifically.
  • the indoor communication system is extended by a dialogue system and a noise simulation to determine the user-preferred noise-dependent gain characteristic.
  • an indoor communication system which consists of at least one microphone and at least one loudspeaker and a signal processing device.
  • the signal processing device comprises a software product that implements a method of indoor communication as described.
  • Fig. 1 shows a simplified block diagram of the system to be identified. This measurement must be performed for each speaker-microphone combination. n here is the time index.
  • the index i stands for the respective speaker-microphone pair.
  • the indoor communication system includes a plurality of speakers and microphones. For ease of illustration, the index i is omitted.
  • This system calibration can be performed at the end of the tape, in the workshop or initiated by the vehicle occupants. By a suitable measurement one obtains the impulse response h LM (n).
  • Fig. 2 is an example of a vehicle measured impulse response h LM (n) and the associated transfer function H LM (e j ⁇ , n) shown.
  • the system calibration is based on the previously determined impulse response h LM (n), which was determined by a system identification.
  • a broadband excitation signal is used for the system identification (measurement of the impulse response h LM (n)). This - known to the measuring system - test signal is played through the speakers and charged with the microphone signals.
  • test signals can be used for the system identification of the loudspeaker microphone system h LM (n), eg noise. White noise or pseudo random noise is well suited for this. This is played back sequentially on each speaker and recorded by the microphones used. From this, the respective impulse response h LM (n) can then be determined.
  • the System identification can be performed separately for each individual speaker-microphone pair or for a group of speakers, microphones together. The need for a common evaluation may be due to the audio system, for example, if it is not possible to address the speakers individually (both hat shelf speakers are connected in parallel, both door speakers - tweeters, woofers - are connected in parallel).
  • the cross-correlation between input and output signal can be used for system identification.
  • an adaptive filter can be used for system identification.
  • the impulse response h (n) can also be determined with the aid of the inverse of the autocorrelation matrix.
  • matrix notation impulse response h, cross-correlation sequence r xy , autocorrelation matrix R xx .
  • the great advantage of the system identification by means of an adaptive filter over the correlation-based methods is the possibility of being able to judge the quality of the estimated impulse response h (n) already during the measurement. Therefore, this method is preferably used for system identification.
  • the Fig. 4 shows how an indoor communication system can be extended by a system identification. Via the switch S2, instead of the indoor communication system output, the measuring signal can be given to the loudspeakers. Via the switch S1, the microphone signals are forwarded to the summation point before the module identification. After the measurement, the determined parameters are taken over by the indoor communication system.
  • Fig. 5 the sequence of the measurement for a speaker-microphone pair is shown. After activating the measurement, the system identification is performed. Subsequently, the quality of the system identification is assessed, because a system calibration may only be performed after a successful measurement. This mechanism should help to avoid errors (eg during a recalibration in the workshop). For this purpose, on the one hand, the alignment of the adaptive filter during system identification can be considered. On the other hand, various sensors such as tachometer and door sensor in the vehicle can also be used to monitor the quality of the measurement carried out.
  • the quality of the specific impulse response can be determined in the case of system identification by means of an adaptive filter from the distance between the smoothed powers of the input signal x (n) and the error signal e (n) of the adaptive filter.
  • the error performance e (n) is determined analogously.
  • the parameter ⁇ should be selected from the interval 0.95 ⁇ ⁇ ⁇ 0.9995 for a sampling frequency of 22050 Hz.
  • the adaptive filter should have adjusted more than 20 dB (D (n)> 20 dB), then the measurement is further evaluated and used for the calibration. If the measurement carried out could not fulfill this criterion, an error message should be output. This can be a warning on a display or as a voice output. As a result, the measurement must be repeated until the desired quality is achieved. If the quality of the measurement is not achieved despite the elimination of all sources of error, there is probably a hardware error (eg amplifier, loudspeaker, microphone) and the system behavior should be adjusted accordingly.
  • a hardware error eg amplifier, loudspeaker, microphone
  • the measurement is used for further evaluations.
  • the details for the evaluation are in Fig. 6 to see.
  • the impulse response h LM (n) has been determined with sufficient quality as described above, it must be evaluated for the calibration.
  • the following system variables can be used for this: Subfrequency band gains, transit time, reverberation time.
  • sub-frequency band gains can be used to equalize the output of the indoor communication system so that the system operates stably at high gain and also sounds pleasing to the users.
  • it must be operated as broadband as possible near the reference frequency response H REF (e j ⁇ , n) with a maximum gain (limited to 0 dB).
  • the reference frequency response was determined by listening tests on a vehicle-specific indoor communication reference system. When determining the reference frequency response, care was taken to ensure that the system operates stably even at high amplification, the system output sounds natural and the speaker's localization is not disturbed.
  • the reference frequency response H REF (e j ⁇ , n) was determined on a reference vehicle .
  • the ICC system had a fixed system run time and a fixed reverberation time (depending on the hardware used, the feedback and the gain). For the system to be calibrated, these variables may differ from the reference system. But they are important for the acoustic speaker localization and the sound quality of the indoor communication system. Based on these measured quantities, taking into account psychoacoustic effects, Factors for correcting the system gain of the reference frequency response are determined. In particular, the precedence effect, also called law of the first wavefront, should be considered. It says: If the same sound signal from a different direction arrives at a listener with a time delay, it only perceives the direction of the first incoming sound signal.
  • the delayed incoming sound signals are then located in the direction of the first signal (the first wavefront).
  • Haas effect is exploited.
  • Haas showed that the law of the first wavefront works even when the level of the delayed incoming sound is up to 10 dB higher than that of the first wavefront.
  • the delayed system reproduction may be louder than the direct sound, the acoustic localization nevertheless remains to a certain extent.
  • the relationship between the gain of the delayed signal (indoor communication system output) versus the first wavefront (direct sound of the speaker) is dependent on this delay.
  • the allowable gain is lower.
  • the effect of the delay on the speaker's location in an indoor communication system can be determined for an indoor communication reference system by listening tests. The amplification is determined at which the localization of the speaker no longer works properly. This has also already been recorded for the reference frequency response H REF (e j ⁇ , n) (reference system with maximum gain and minimum transit time). The fact that this gain is dependent on the delay results in a correction curve for the system gain that is dependent on the system runtime.).
  • the Fig. 7 shows an example of the dependence of the system gain on the system transit time determined by hearing tests (upper curve, reference ordinate left, abscissa below).
  • the maximum gain at the lowest possible runtime is normalized to 0 dB. So that the vehicle with activated interior communication system does not sound too reverberant to the audience, the amplification must be reduced with increasing reverberation time.
  • the Fig. 7 shows an example of the dependence of the system gain on the reverberation time (lower curve, reference ordinate right, abscissa above)
  • the system runtime is dependent on the system components used, modern digital audio amplifiers in the vehicle can add to the signal path a non-negligible delay (signal buffer, equalizer). Based on the listening tests, the gain must be reduced at higher system delays to facilitate the speaker's acoustic localization.
  • the duration from the beginning of the impulse response to the highest modulation at the beginning of the impulse response must be measured. In the example in the Fig. 8 the runtime is 8 ms (delay through amplifier, sound propagation, signal processing).
  • the reverberation time T60 is defined as the time required for the energy of the impulse response to drop by 60 dB and can be determined directly from the energy decay behavior of the impulse response.
  • the Fig. 9 shows as an example the energy decay curves for a vehicle with switched off interior communication system (T60 ⁇ 52 ms) and with activated interior communication system (T60 ⁇ 69 ms).
  • the correction for the gain of the reference frequency response g REC (n) can be determined.
  • H REC e j ⁇ ⁇ ⁇ ⁇ ⁇ n G REC n ⁇ H REF e j ⁇ ⁇ ⁇ ⁇ ⁇ n , Then the frequency response must be determined from the measured impulse response h LM (n), or the amount of the frequency response
  • be calculated H LM e j ⁇ ⁇ ⁇ ⁇ ⁇ n FT H LM n , Subsequently, the frequency response of the equalizer filter
  • be determined H EQ e j ⁇ ⁇ ⁇ ⁇ n min H REC e j ⁇ ⁇ ⁇ ⁇ ⁇ n H LM j ⁇ ⁇ ⁇ ⁇ n ⁇ G EQ .
  • H SYS (e j ⁇ , n) for the total frequency response :
  • H SYS e j ⁇ ⁇ ⁇ ⁇ ⁇ n H EQ e j ⁇ ⁇ ⁇ ⁇ ⁇ n ⁇ H LM e j ⁇ ⁇ ⁇ ⁇ ⁇ n ⁇ H REF e j ⁇ ⁇ ⁇ ⁇ ⁇ n
  • the individual steps are based on the example in the Fig. 10 illustrated.
  • the equalizer filter is calculated based on the corrected reference frequency response.
  • a successful adjustment of the adaptive filter can only be done with a sufficiently strong signal level (level of the microphone signal). If this level is too low, it means that either the playback side (amplifier, loudspeaker) or the reception side (microphone, amplifier) is defective. If a too low level is received at the input of the system (microphone signal), it is first tried to increase the playback level of the system identification in order to obtain better measurement results and to repeat the measurement. This can not be increased arbitrarily. For example, not to destroy the system speakers, the maximum playback level is limited. If this has been achieved and the quality of the measurement is still not sufficient, the measurement is not repeated, but continued with the next measurement. In this case, a note about the erroneous measurement is stored for later evaluation.
  • the calibration system contains a voice or noise detector, these can be used to monitor the voice and noise activity during the measurement. If speech or noise activity is detected in the recorded microphone signal, the measurement should be repeated to obtain a better measurement result.
  • additional information can also be used to monitor the quality of the measurement.
  • the sensors in the vehicle can be used to check the safety of the measurements: window sensors for closed windows, door sensors for closed doors, speed sensor for switched-off motor, etc.
  • the table shows an overview of the different sensors and their influence on the quality of the measurement. Again, if the conditions are not correct, the measurement must be repeated.
  • Sensor signal (if available) Effect on the quality of the measurement
  • Seat sensor Additional noise source by passengers in the interior A web sensor Additional noise source by passengers in the interior motion sensor Additional noise source by passengers in the interior sunroof sensor Interior is not measured correctly door sensor Interior is not measured correctly window sensor Interior is not measured correctly Motorsensor Additional noise source radio signal Additional noise source
  • Fig. 12 shows the evaluation of the bitmaps of a faulty measurement for a system with 4 microphones and 6 loudspeakers.
  • the result of the measurements has been summarized in a matrix (white fields for good results, gray fields for incorrect measurements). From the example in the Fig. 12 It can be seen that in the left image all measurements in which the second loudspeaker was involved are faulty. It can be concluded that the 2nd speaker output (amplifier output, speaker) is not working properly. In the example on the right, the 3rd microphone is damaged. With this method, the cause of the error can be narrowed down more precisely in the case of system errors become. This can then be followed by an error message and the system behavior adapted to the situation. This can be done for example by switching off the indoor communication system, switching the microphones or switching the speakers.
  • the indoor communication system includes a multi-channel echo canceller (part of the indoor communication system signal processing) to suppress the radio signal in the indoor communication system reproduced signal in simultaneous indoor communication system and radio operation
  • the adaptive filters of the echo canceller for the calibration can be evaluated.
  • Fig. 13 shows the basic structure of a stereo echo canceller.
  • the echo canceller uses an adaptive filter (similar to the system identification filter) to estimate the impulse responses between the speakers and the microphones.
  • the estimated impulse responses from the echo canceller can be used to readjust the interior communication system unnoticed by the user in the background. If the desired accuracy is achieved when adjusting the echo canceller, the impulse responses can be evaluated as in the system identification and the parameters determined therefrom (equalizer filter, system deactivation, etc.) can be adopted for the indoor communication system operation.
  • the NDGC characteristic of the indoor communication system for various background noises is adjusted to the needs of the vehicle passengers in a dialog-supported manner.
  • the sound simulation emits signals via the loudspeakers which generate a background noise in the vehicle interior that corresponds to a specific vehicle speed. Low speed - low background noise, high speed - lots of background noise.
  • the output signal of the noise simulator may either be a microphone signal (background noise in the vehicle interior) previously recorded while driving at different speeds, or a spectrally colored noise whose power density spectrum corresponds to that of the real background noise is played back.
  • This signal played by the noise simulator disturbs the passengers in communicating similar to the actual background noise while driving.
  • the advantage of using a noise simulator for the dialog-based adjustment of the NDGC characteristic curve is that it can be activated by the user when stationary, the passengers are not distracted from the traffic during the dialogue, and the vehicle is not driven at different speeds (eg between 0-150 km / h).
  • the user When determining the NDGC characteristic, the user is supported by a dialog system. The determination may be made step by step during driving (automatic activation after the detection of a suitable situation) or while standing with a sound simulation. The following steps describe one Determining the NDGC characteristic with the help of a noise simulation, but can also be adopted for the setting while driving.
  • the Fig. 16 shows the procedure for determining the NDGC characteristic. First, the gain for the maximum system support is determined, whereby the maximum gain g NDGC , max at which the indoor communication system is still working stably must not be exceeded (normalization to 0 dB). Subsequently, the gain is determined incrementally for less system support (less background noise).
  • the setting is completed when the minimum system gain g NDGC, min has also been determined. After the NDGC characteristic has been determined, it can then be taken over by the indoor communication system for operation.
  • These settings should be stored separately for the individual vehicle users, that is to say user-specifically, so that each user can also later access the parameters determined by him.
  • Fig. 17 It may be a possible step of the dialogue as in Fig. 17 expire shown.
  • the user is explained the following calibration step and the necessary actions are described, eg "Select the desired noise-dependent gain”.
  • an action is carried out by the user, for example, the front passenger speaks a test set, which is to judge the rear passenger.
  • an input is made to the dialog system by the users. This can either be done by voice command, eg "louder", or haptically, eg by entering the system gain via the volume control.
  • the new settings can also be visually displayed via a display.
  • the current step is repeated or continued with the next dialog step.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP10171617A 2010-08-02 2010-08-02 Procédé de communication à l'intérieur d'une pièce Ceased EP2416593A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016118950A1 (de) * 2016-10-06 2018-04-12 Visteon Global Technologies, Inc. Verfahren und Einrichtung zur adaptiven Audiowiedergabe in einem Fahrzeug
CN108449688A (zh) * 2018-03-19 2018-08-24 长沙世邦通信技术有限公司 室内广播音频处理方法、装置及系统
DE102017220466B3 (de) 2017-11-16 2019-01-24 Audi Ag Verfahren zum Überprüfen der Funktionsfähigkeit mindestens einer Komponente eines Kraftfahrzeugs und Kraftfahrzeug
EP3694230A1 (fr) * 2019-02-08 2020-08-12 Ningbo Geely Automobile Research & Development Co. Ltd. Diagnostic audio dans un véhicule
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US11798576B2 (en) 2014-02-27 2023-10-24 Cerence Operating Company Methods and apparatus for adaptive gain control in a communication system
DE102016118950A1 (de) * 2016-10-06 2018-04-12 Visteon Global Technologies, Inc. Verfahren und Einrichtung zur adaptiven Audiowiedergabe in einem Fahrzeug
DE102017220466B3 (de) 2017-11-16 2019-01-24 Audi Ag Verfahren zum Überprüfen der Funktionsfähigkeit mindestens einer Komponente eines Kraftfahrzeugs und Kraftfahrzeug
CN108449688A (zh) * 2018-03-19 2018-08-24 长沙世邦通信技术有限公司 室内广播音频处理方法、装置及系统
EP3694230A1 (fr) * 2019-02-08 2020-08-12 Ningbo Geely Automobile Research & Development Co. Ltd. Diagnostic audio dans un véhicule
CN113475100A (zh) * 2019-02-08 2021-10-01 宁波吉利汽车研究开发有限公司 车辆中的音频诊断

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