EP1360872A2 - Procede de reglage automatique des parametres de filtrage d'un egaliseur numerique et dispositif de restitution de signaux audio permettant la mise en oeuvre de ce procede - Google Patents

Procede de reglage automatique des parametres de filtrage d'un egaliseur numerique et dispositif de restitution de signaux audio permettant la mise en oeuvre de ce procede

Info

Publication number
EP1360872A2
EP1360872A2 EP01273659A EP01273659A EP1360872A2 EP 1360872 A2 EP1360872 A2 EP 1360872A2 EP 01273659 A EP01273659 A EP 01273659A EP 01273659 A EP01273659 A EP 01273659A EP 1360872 A2 EP1360872 A2 EP 1360872A2
Authority
EP
European Patent Office
Prior art keywords
frequency response
equalizer
filter parameters
frequency
vehicle interior
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01273659A
Other languages
German (de)
English (en)
Inventor
Christoph Montag
Juergen Wermuth
Udo Klaas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1360872A2 publication Critical patent/EP1360872A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/04—Circuits for transducers for correcting frequency response

Definitions

  • the invention relates to a method for automatically setting the filter parameters - center frequency, quality and amplification or attenuation - of at least one digital equalizer, which is part of a playback device for audio signals in a vehicle interior. Furthermore, the invention relates to a playback device for audio signals for implementing such a method, with a loudspeaker device and with an audio processor which comprises at least one digital equalizer, is arranged in the signal path between at least one signal source and the loudspeaker device and is connected to a control processor via a control bus.
  • the invention is based on the car radio devices known from practice, which are based on the so-called 2-IC technology. With these car radio devices, two or three freely programmable audio filters are integrated in the signal path. This
  • Digital parametric equalizers are available to the user to compensate for inadequacies in the acoustics in the vehicle interior.
  • the user can vary the filter frequency, quality, ie filter width, and gain or attenuation of each filter in order to compensate for peaks and so-called holes in the acoustic frequency response of the vehicle interior.
  • car radio devices are known with an audio module integrated in the signal path, on which a graphic equalizer is implemented with the aid of a digital signal processor.
  • the seven or nine bands of such a graphic equalizer are fixed in their center frequency and quality and can only be changed in their amplification.
  • the separate audio module of these car radio devices enables automatic calibration of the graphic equalizer.
  • the acoustics in the vehicle interior are measured using a microphone that is connected to the audio module via an A / D converter.
  • the graphic equalizer is then set so that the inadequacies of the acoustics are compensated for as best as possible.
  • a playback device of the type mentioned at the outset which, according to the invention, for the automatic setting of the digital equalizer (s) comprises a noise generator via which a noise signal can be fed to the equalizer.
  • the control processor includes means by which the filter parameters can be set such that the equalizer has a bandpass characteristic with a narrow bandwidth, the center frequency being variable over the audio spectrum.
  • At least one microphone with evaluation means is provided for detecting the signal emitted by the loudspeaker device into the vehicle interior and for determining the frequency response.
  • the control processor also includes means by which the filter parameters can be set taking into account the measured frequency response.
  • an automatic setting of the filter parameters of the digital equalizers of a playback device for audio signals in a vehicle interior makes sense, since the individual acoustic properties of the user-specifically designed and equipped vehicle interior must be taken into account when optimizing the filter parameters and these are best recorded by measurement technology can.
  • a very good compensation of the shortcomings in the acoustics of the vehicle interior can be achieved regardless of the position and width of the peaks and holes in the measured frequency response.
  • the equalizers to be measured can first be used to determine the acoustic frequency response of the vehicle interior before the filter parameters to compensate for the shortcomings in the measured frequency response can be set.
  • the filter parameters can be optimized by the control processor of the car radio, which is already present, with the aid of appropriate additional software. Overall, therefore, no additional audio module with a digital signal processor is required within the scope of the invention, but only a microphone amplification and rectification circuit which is coupled to the A / D converter present in the control processor. As a result, the automatic setting of the filter parameters proposed according to the invention requires only very little additional hardware and software and thus costs.
  • the loudspeaker device of the playback device is controlled successively by bandpass noise signals with different center frequencies.
  • the frequency bands set in the form of a bandpass noise signal cover the entire audio spectrum.
  • the frequency response to be determined is now determined in the form of frequency measuring points for the individual frequency bands. As the frequency measuring point for a specific frequency band, the sound level of the signal can simply be determined, which in this case is emitted by the loudspeaker device into the vehicle interior.
  • the filter parameters can be set in such a way that the equalizer has a bandpass characteristic with a narrow bandwidth at a given center frequency.
  • the equalizer then generates the desired bandpass noise signal or a sequence of bandpass noise signals from a noise signal supplied to it, which cover the entire audio spectrum.
  • the automatic determination and setting of the filter parameters within the scope of the method according to the invention.
  • several standardized equalizer pattern curves of different qualities are stored for this.
  • the center frequency of the pattern curve is now shifted to the local maximum for each pattern curve and each local maximum determined in the measured frequency response, and an attenuation is determined by scaling the pattern curve to the height of this local maximum.
  • the filter corresponding to this scaled pattern curve is then applied to the measured frequency response, and the deviation of the resulting frequency response from a target frequency response is determined.
  • the automatic adjustment of the equalizer is based on the Pilter parameters - center frequency, attenuation and quality - of the pattern curve for which the smallest error value has been determined.
  • the filter parameters of several digital equalizers have to be set automatically, it is advantageous to determine the filter parameters of the individual equalizers one after the other by applying the previously set equalizer (s) to the measured frequency response before determining the filter parameters of an equalizer.
  • the single figure shows the block diagram of a playback device for audio signals for implementing the method according to the invention.
  • the playback device 1 shown in the single figure is used to reproduce audio signals in a vehicle interior, wherein the audio signals can be generated by different audio sources 2, 3, such as radio, CD, CC, etc.
  • the playback device 1 comprises a loudspeaker device 4 and an audio processor 5 arranged in the signal path between the audio sources 2, 3 and the loudspeaker device 4 with two freely adjustable digital equalizers 6, 7, via which the signals from the different audio sources 2, 3 are fed to the loudspeaker device 4 become.
  • two equalizers can also be provided here.
  • a control Processor 8 sends suitable filter parameters to the audio processor 5 via a control bus 9.
  • the reproduction device 1 further comprises a noise generator 10, via which a noise signal can be fed to the equalizers 6, 7.
  • the noise generator 10 is implemented here as additional software in the audio processor 5 and can be started via the control processor 8 if required.
  • the noise signal could also be generated by an external noise source as an additional audio source, e.g. with the help of a corresponding CD or a suitably set tuner.
  • control processor 8 comprises means by means of which the filter parameters can be set such that the equalizers 6, 7 have a bandpass characteristic with a narrow bandwidth, i.e. with a quality of the order of 8, the center frequency being variable over the audio spectrum.
  • the loudspeaker device 4 can be controlled with the aid of the noise generator 10 and via the equalizers 6, 7 with a bandpass noise signal.
  • the control processor 8 varies the filter parameters in a defined chronological order such that the center frequency of the bandpass filter decreases, for example, in thirds intervals from the highest to the lowest frequency to be set.
  • the signals which are then emitted into the vehicle interior via the loudspeaker device 4, are recorded with the aid of a microphone 11 and evaluated with suitable evaluation means 12 for determining the frequency response of the vehicle interior.
  • the signals detected by the microphone 11 are amplified, logarithmic and rectified in an operational amplifier circuit, so that a DC voltage is present at the output of this circuit.
  • the magnitude of this DC voltage is proportional to the sound level or sound pressure in the vehicle interior for the frequency band which is set by the respective bandpass noise signal.
  • the DC voltage representing the sound level is sampled by an A / D converter 13 of the control processor 8, so that after the tuning of all frequencies or frequency bands to be measured with the corresponding voltage values, the control processor 8 has a precise image of the acoustic frequency response of the vehicle interior. Only the absolute frequency response or amplitude response is referred to here as the frequency response and not the phase response.
  • the control processor 8 now determines the shortcomings, i.e. the resonances and holes, the acoustics of the vehicle interior in the form of local maxima and minima in the measured frequency response and determines the filter parameters, center frequency, gain and quality, the equalizer 6, 7 so that these shortcomings are compensated for as well as possible.
  • the entire additional effort compared to a car radio whose equalizer cannot be set automatically consists of additional hardware 10 or additional software for generating a noise signal, additional software in the control processor 8 which takes over the sequence control of the calibration process and the determination of the best filter parameter setting, and additional hardware. would be 12 for the amplification, logarithmization and rectification of the microphone signal.
  • the resonances i.e. the local maxima in the measured frequency response and adjusted for the frequency response of the microphone.
  • the following work steps are then carried out for each pattern curve and each of these local maxima:
  • the center frequency of the pattern curve is shifted to the local maximum and scaled with the level of the resonance, ie the level of the maximum.
  • the the resulting frequency response is subtracted from the measured frequency response, which corresponds to the application of a filter with the properties of the shifted and scaled pattern curve to the measured frequency response.
  • the target frequency response is generally linear, but certain frequency ranges can also be increased or decreased.
  • the deviation is determined by weighted sum of the amounts of the individual deviations at the frequency points and is a measure of how good the equalization is for the individual shifted and scaled pattern curves. The greater the value of the deviation, the worse the equalizing. Positive deviations are weighted twice compared to negative deviations, so that any remaining excess increases in the frequency response are rated as worse than the psychoacoustically far less critical holes. Different weighting of individual frequency ranges is also conceivable here, since resonances in certain frequency ranges are more critical than in others.
  • Resonances are assigned smaller error values than broad less high resonances with the same "error area".
  • the former are thus preferably eliminated, which makes sense from a psychoacoustic point of view.

Landscapes

  • 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)
  • Circuit For Audible Band Transducer (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

L'invention concerne un procédé permettant de régler automatiquement les paramètres de filtrage (fréquence centrale, qualité et amplification ou atténuation) d'au moins un égaliseur numérique (6, 7) faisant partie d'un dispositif de restitution (1) de signaux audio dans un habitacle de véhicule. Dans un premier temps, la réponse fréquentielle acoustique de l'habitacle du véhicule est déterminée, puis les insuffisances de l'acoustique de l'habitacle du véhicule sont déterminées sous forme de maxima et de minima locaux dans la réponse fréquentielle mesurée. A partir de là, les paramètres de filtrage sont automatiquement réglés de telle sorte qu'au moins une partie de ces insuffisances soit compensée. L'invention concerne également un dispositif de restitution de signaux audio permettant la mise en oeuvre de ce procédé.
EP01273659A 2001-02-06 2001-11-09 Procede de reglage automatique des parametres de filtrage d'un egaliseur numerique et dispositif de restitution de signaux audio permettant la mise en oeuvre de ce procede Withdrawn EP1360872A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10105184A DE10105184A1 (de) 2001-02-06 2001-02-06 Verfahren zum automatischen Einstellen eines digitalen Equalizers und Wiedergabeeinrichtung für Audiosignale zur Realisierung eines solchen Verfahrens
DE10105184 2001-02-06
PCT/DE2001/004221 WO2002063918A2 (fr) 2001-02-06 2001-11-09 Procede de reglage automatique des parametres de filtrage d'un egaliseur numerique et dispositif de restitution de signaux audio permettant la mise en oeuvre de ce procede

Publications (1)

Publication Number Publication Date
EP1360872A2 true EP1360872A2 (fr) 2003-11-12

Family

ID=7672932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01273659A Withdrawn EP1360872A2 (fr) 2001-02-06 2001-11-09 Procede de reglage automatique des parametres de filtrage d'un egaliseur numerique et dispositif de restitution de signaux audio permettant la mise en oeuvre de ce procede

Country Status (4)

Country Link
US (1) US7289637B2 (fr)
EP (1) EP1360872A2 (fr)
DE (1) DE10105184A1 (fr)
WO (1) WO2002063918A2 (fr)

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Also Published As

Publication number Publication date
US7289637B2 (en) 2007-10-30
WO2002063918A2 (fr) 2002-08-15
US20040105558A1 (en) 2004-06-03
WO2002063918A3 (fr) 2003-02-20
DE10105184A1 (de) 2002-08-29

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