EP3937515A1 - Émetteur électroacoustique à commande d'invariance - Google Patents

Émetteur électroacoustique à commande d'invariance Download PDF

Info

Publication number
EP3937515A1
EP3937515A1 EP20075008.1A EP20075008A EP3937515A1 EP 3937515 A1 EP3937515 A1 EP 3937515A1 EP 20075008 A EP20075008 A EP 20075008A EP 3937515 A1 EP3937515 A1 EP 3937515A1
Authority
EP
European Patent Office
Prior art keywords
hrtfs
signals
stereo
invariants
signal
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Withdrawn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
EP20075008.1A
Other languages
German (de)
English (en)
Inventor
Par Clemens
Clemens Par
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP20075008.1A priority Critical patent/EP3937515A1/fr
Priority to EP21733058.8A priority patent/EP4176591A1/fr
Priority to US18/011,434 priority patent/US20230247381A1/en
Priority to PCT/EP2021/000069 priority patent/WO2022008092A1/fr
Publication of EP3937515A1 publication Critical patent/EP3937515A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]

Definitions

  • the optimized acquisition, the optimized transmission or the optimized recalculation (including coding) of spatial audio signals are either head-related, by means of acoustic measurement of the human head shape (Head Related Transfer Functions, HRTFs), or loudspeaker-related, by the distribution of the audio signal to a referential display of speakers (e.g. ITU-R 5.1 Surround or NHK 22.2) .
  • HRTFs Head Related Transfer Functions
  • loudspeaker-related by the distribution of the audio signal to a referential display of speakers (e.g. ITU-R 5.1 Surround or NHK 22.2) .
  • WO2016030545 (“Comparison or Optimization of Signals Using the Covariance of Algebraic Invariants”) describes together with WO2012016992 (“Device and Method for Evaluating and Optimizing Signals on the Basis of Algebraic Invariants”) the so-called Par-Hilbert invariants in Ecma TC32-TG22, whereby these remain the subject of orthogonal projections onto algebraic cones, which are consistently used as principal components of the form of the human ear can be observed, which reflects the sound.
  • head-related HRTFs can be generated from original loudspeaker signals with an accuracy of more than 99 percent by means of so-called convolution in the frequency domain (frequency domain ), mostly by means of FFT or QMF, in successively calculated time windows, whereby the transmitter curve of the headphones used, also according to the state of the art, must also be taken into account.
  • ECMA-416 also operates in the frequency domain and therefore cannot solve the problem of increased latency.
  • the broadcaster agnostically, wanted a stereo signal that could be directly reproduced for all applications: for headphones and at the same time for loudspeakers, namely for stereo, for surround and for three-dimensional loudspeaker setups, in real time.
  • the original signal is now replaced by its polynomial approximation (e.g. according to Chebyshev) and if the all-pass filter is approximately simulated with a loudspeaker rotated by 90°, the so-called substitution determinant is immediately recognizable, around which the subsequent z-transformation is also based
  • the subject stereo signal differs from its original Par-Hilbert invariants of order 1 in terms of its three-dimensionality.
  • both human auricles (after a long natural selection) correspond to a forward-pointing double cone including its polarity reversal, thus exactly the algebraic cones FIG. 1 to 3 .
  • ITDs interaural time differences
  • IIDs interaural intensity differences
  • CC-HRTFs ritical Cue Head Related Transfer Functions
  • the structure of the cochlea is decisive for the perceived critical cues.
  • the bandwidths of the bark scale suggest, according to the invention, that instead of measuring the HRTFs, the diameter of the head should be reduced (for example by around 10%) without the localization critically changing, but the measuring point of the CC-HRTF (ear opening). not to vary (this criterion is already met by a silicone tube protruding by approx. 1cm per ear opening). Please refer FIG. 7 .
  • Such an arrangement now makes it possible to approximately reconstruct the space based on an arrangement, for example the shape FIG. 8th for stereo and ITU-R 5.1 surround (the center channel is not shown because according to ITU-R it only transmits mono signals in this position):
  • the speakers BtFL and BtFR on the floor are now added to the stereo speakers FL and FR, offset by 90° above.
  • the speakers BL and BR are, for example, as in ITU-R 5.1 Surround added and, shifted 90° up, also added to the floor with BtBL and BtBR complementary.
  • NB A variant is, for example, the omission of BL and BR and the attachment of BtBL and BtBR at the same level as FL and FR without substantially changing the principle of operation. All possible installation variants are therefore part of the subject matter of the invention.
  • All loudspeakers but in particular BtFL and BtFR as well as BtBL and BtBR, can be subjected to equalization so that the spatial sound components are emphasized.
  • an artificial head of the form FIG. 7 newly measured the so-called CC-HRTFs.
  • the output signal is now formed as follows: It can be shown experimentally that an audio signal below 120 Hz that is only slightly bent by the anatomy of the head remains uncritical with regard to localization. This frequency range can thus easily be retained in the output signal via a low-pass filter.
  • the sound engineer then usually increases the high frequency range using microphones or an equalizer, while the bark scale also suggests increasing the CC-HRTF.
  • Bark Scale suggests adding the CC-HRTFs to the output signal in terms of their physical overtones in order to increase their robustness.
  • a so-called octave filter already achieves this, for example.
  • the resulting output signal has the following properties in the experiment:
  • the added CC-HRTFs allow the head to be moved by more than 90° without head-tracking. They form both with loudspeaker operation via stereo and independently of this with headphones.
  • the use of dipole loudspeakers is not mandatory for an adequate one listening experience.
  • the localization and sound characteristics of the original recording room are preserved.
  • An embodiment of the invention is an apparatus for analog acquisition of the CC-HRTF in real time.
  • an artificial head whose diameter has been reduced by about 10% compared to the human head while maintaining the bark scale, see FIG. 7 , equipped with two silicone hoses, which protrude approx. 1cm beyond the ear cups to pick up the CC-HRTFs.
  • the diaphragm of the human ear is replaced by a microphone of appropriate impedance in the usual way, as in the case of an artificial head.
  • the dummy head is in the sweet spot of a non-anechoic room with a loudspeaker arrangement of the form, for example FIG. 8th placed.
  • a stereo signal is encoded by ECMA-407 as a mono signal plus 2kbps payload, and this is output directly via a left front speaker FL and a left front speaker FR after decoding.
  • the frequency loss of the 1st main reflection compared to the original signal is simulated via equalization, and the resulting left ECMA-407 output signal after such equalization directly via a lower left loudspeaker BtFL placed on the floor and offset 90° above FL radiated above.
  • the resulting right ECMA-407 output signal after such equalization is radiated upwards directly via a lower right loudspeaker BtFR placed on the floor and offset 90° upwards compared to FR.
  • the frequency loss of the 1st or 2nd main reflection compared to the original signal is simulated via equalization, and the resulting left ECMA-407 output signal, after equalization and adjustment of the volume, is fed with reverse polarity to the rear left loudspeaker BL at ear level, which is reversed compared to FL rotated 180°.
  • the resulting right ECMA-407 output signal after such equalization and adjustment of the volume, is fed with reversed polarity to the rear right loudspeaker BR at ear level, which has been rotated by 180° with respect to FR.
  • the frequency loss of the 1st or 2nd main reflection compared to the original signal is simulated via equalization, and the resulting reversed polarity, rear left ECMA-407 output signal after such equalization and adjustment of the volume directly via a lower left, compared to BL 90° upwards, placed on the floor, BtBL loudspeaker radiated upwards.
  • the resulting reversed polarity, rear right ECMA-407 output signal after such equalization and adjustment of the volume is radiated upwards directly via a lower right loudspeaker BtBR placed on the floor and offset 90° upwards compared to BR.
  • these are expanded using the bark scale, for example using an octave filter, by specifically amplifying the overtones of the CC-HRTFs.
  • the resulting stereo signal is made up as follows: A low-pass filter seamlessly inserts FL and FR below 120Hz into the resulting stereo output signal from our arrangement. A high-pass filter adds FL and FR in an attenuated form and with equalization below the critical limit at which, together with the measured CC-HRTFs, localization in the head would occur with headphone operation.
  • the measured CC-HRTFs are added in such a way that they completely satisfy the sound engineer's efforts to prefer the high frequencies.
  • an all-pass filter can also be inserted per speaker rotated by 90°. The same considerations as above apply with regard to the invariances.
  • HRTFs can be calculated by convolution, see above.
  • CC-HRTFs so that an arrangement according to FIG. 8th with appropriate calculation and automation, see above, a forteriori can be omitted.
  • Such calculations and automations are therefore part of the subject matter of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Stereophonic System (AREA)
EP20075008.1A 2020-07-06 2020-07-06 Émetteur électroacoustique à commande d'invariance Withdrawn EP3937515A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20075008.1A EP3937515A1 (fr) 2020-07-06 2020-07-06 Émetteur électroacoustique à commande d'invariance
EP21733058.8A EP4176591A1 (fr) 2020-07-06 2021-06-03 Émetteur électroacoustique commandé par invariance
US18/011,434 US20230247381A1 (en) 2020-07-06 2021-06-03 Invariance-controlled electroacoustic transmitter
PCT/EP2021/000069 WO2022008092A1 (fr) 2020-07-06 2021-06-03 Émetteur électroacoustique commandé par invariance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20075008.1A EP3937515A1 (fr) 2020-07-06 2020-07-06 Émetteur électroacoustique à commande d'invariance

Publications (1)

Publication Number Publication Date
EP3937515A1 true EP3937515A1 (fr) 2022-01-12

Family

ID=71522934

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20075008.1A Withdrawn EP3937515A1 (fr) 2020-07-06 2020-07-06 Émetteur électroacoustique à commande d'invariance
EP21733058.8A Pending EP4176591A1 (fr) 2020-07-06 2021-06-03 Émetteur électroacoustique commandé par invariance

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP21733058.8A Pending EP4176591A1 (fr) 2020-07-06 2021-06-03 Émetteur électroacoustique commandé par invariance

Country Status (3)

Country Link
US (1) US20230247381A1 (fr)
EP (2) EP3937515A1 (fr)
WO (1) WO2022008092A1 (fr)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1850639A1 (fr) 2006-04-25 2007-10-31 Clemens Par Système générateur de signaux audio multiples à partir d'au moins un signal audio
WO2009138205A1 (fr) 2008-05-13 2009-11-19 Clemens Par Dispositif dont le fonctionnement dépend de l'angle ou méthode d'acquisition d'un signal audio pseudo-stéréophonique
WO2011009650A1 (fr) 2009-07-22 2011-01-27 Stormingswiss Gmbh Dispositif et procédé permettant d’optimiser des signaux audio stéréophoniques ou pseudo-stéréophoniques
WO2012016992A2 (fr) 2010-08-03 2012-02-09 Stormingswiss Gmbh Dispositif et procédé d'évaluation et d'optimisation de signaux sur la base d'invariantes algébriques
WO2012032178A1 (fr) 2010-09-10 2012-03-15 Stormingswiss Gmbh Dispositif et procédé permettant l'évaluation temporelle et l'optimisation de signaux stéréophoniques ou pseudo-stéréophoniques
WO2012032179A2 (fr) 2010-09-10 2012-03-15 Miniflex Limited Connecteur de fibres optiques
WO2014072513A1 (fr) 2012-11-09 2014-05-15 Stormingswiss Sàrl Codage inverse non linéaire de signaux multicanaux
WO2015049332A1 (fr) 2013-10-02 2015-04-09 Stormingswiss Gmbh Dérivation de signaux multicanaux à partir de deux signaux primaires ou plus
WO2015049334A1 (fr) 2013-10-02 2015-04-09 Stormingswiss Gmbh Procédé et dispositif de downmixage d'un signal multicanaux et d'upmixage d'un signal downmixé
WO2015128379A1 (fr) 2014-02-28 2015-09-03 Stormingswiss Sàrl Codage et décodage d'un canal basse fréquence dans un signal audio multicanal
WO2015128376A1 (fr) 2014-02-28 2015-09-03 Stormingswiss Sàrl Détermination résiduelle autonome et gain de signaux supplémentaires d'alarmes résiduelles
WO2015173422A1 (fr) 2014-05-15 2015-11-19 Stormingswiss Sàrl Procédé et dispositif pour la réalisation sans résiduelle d'un mixage élévateur à partir d'un mixage réducteur
WO2016030545A2 (fr) 2014-08-29 2016-03-03 Clemens Par Comparaison ou optimisation de signaux sur la base de la covariance d'invariants algébriques

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1850639A1 (fr) 2006-04-25 2007-10-31 Clemens Par Système générateur de signaux audio multiples à partir d'au moins un signal audio
WO2009138205A1 (fr) 2008-05-13 2009-11-19 Clemens Par Dispositif dont le fonctionnement dépend de l'angle ou méthode d'acquisition d'un signal audio pseudo-stéréophonique
WO2011009650A1 (fr) 2009-07-22 2011-01-27 Stormingswiss Gmbh Dispositif et procédé permettant d’optimiser des signaux audio stéréophoniques ou pseudo-stéréophoniques
WO2011009649A1 (fr) 2009-07-22 2011-01-27 Stormingswiss Gmbh Dispositif et procédé d'amélioration de signaux audio stéréophoniques ou pseudo-stéréophoniques
WO2012016992A2 (fr) 2010-08-03 2012-02-09 Stormingswiss Gmbh Dispositif et procédé d'évaluation et d'optimisation de signaux sur la base d'invariantes algébriques
WO2012032178A1 (fr) 2010-09-10 2012-03-15 Stormingswiss Gmbh Dispositif et procédé permettant l'évaluation temporelle et l'optimisation de signaux stéréophoniques ou pseudo-stéréophoniques
WO2012032179A2 (fr) 2010-09-10 2012-03-15 Miniflex Limited Connecteur de fibres optiques
WO2014072513A1 (fr) 2012-11-09 2014-05-15 Stormingswiss Sàrl Codage inverse non linéaire de signaux multicanaux
WO2015049332A1 (fr) 2013-10-02 2015-04-09 Stormingswiss Gmbh Dérivation de signaux multicanaux à partir de deux signaux primaires ou plus
WO2015049334A1 (fr) 2013-10-02 2015-04-09 Stormingswiss Gmbh Procédé et dispositif de downmixage d'un signal multicanaux et d'upmixage d'un signal downmixé
WO2015128379A1 (fr) 2014-02-28 2015-09-03 Stormingswiss Sàrl Codage et décodage d'un canal basse fréquence dans un signal audio multicanal
WO2015128376A1 (fr) 2014-02-28 2015-09-03 Stormingswiss Sàrl Détermination résiduelle autonome et gain de signaux supplémentaires d'alarmes résiduelles
WO2015173422A1 (fr) 2014-05-15 2015-11-19 Stormingswiss Sàrl Procédé et dispositif pour la réalisation sans résiduelle d'un mixage élévateur à partir d'un mixage réducteur
WO2016030545A2 (fr) 2014-08-29 2016-03-03 Clemens Par Comparaison ou optimisation de signaux sur la base de la covariance d'invariants algébriques

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
AHMAD JUNAID JAMEEL ET AL: "ECMA-407: New Approaches to 3D Audio Content Data Rate Reduction with RVC-CAL", AES CONVENTION 137; OCTOBER 2014, AES, 60 EAST 42ND STREET, ROOM 2520 NEW YORK 10165-2520, USA, 8 October 2014 (2014-10-08), XP040639127 *
CLEMENS PAR: "ECMA-407 - Teil 1: Internationaler Standard für modularen 3D-Audio-Transport", FERNSEH- UND KINOTECHNIK (FKT), BERLIN, DE, no. 4, 1 April 2015 (2015-04-01), pages 174 - 176, XP009184451, ISSN: 0015-0142 *
CLEMENS PAR: "ECMA-407 - Teil 2: Internationaler Standard für modularen 3D-Audio-Transport", FERNSEH- UND KINOTECHNIK (FKT), BERLIN, DE, no. 5, 1 May 2015 (2015-05-01), pages 246 - 249, XP009184452, ISSN: 0015-0142 *
CLEMENS PAR: "Poesie des Raums", FKT FERNSEH UND KINOTECHNIK, FACHVERLAG SCHIELE & SCHON GMBH., BERLIN, DE, vol. 67, no. 5, 1 May 2013 (2013-05-01), pages 260 - 264, XP001584335, ISSN: 1430-9947 *

Also Published As

Publication number Publication date
WO2022008092A1 (fr) 2022-01-13
US20230247381A1 (en) 2023-08-03
EP4176591A1 (fr) 2023-05-10

Similar Documents

Publication Publication Date Title
DE60119911T2 (de) System und verfahren zur optimierung von dreidimensionalem audiosignal
EP3149969B1 (fr) Détermination et utilisation de fonctions de transfert acoustiquement optimisées
DE69433258T2 (de) Raumklangsignalverarbeitungsvorrichtung
DE60304358T2 (de) Verfahren zur verarbeitung von audiodateien und erfassungsvorrichtung zur anwendung davon
EP3044972B1 (fr) Dispositif et procédé de décorrélation de signaux de haut-parleurs
AT394650B (de) Elektroakustische anordnung zur wiedergabe stereophoner binauraler audiosignale ueber kopfhoerer
EP2891334B1 (fr) Génération de son multivoies à partir de signaux audio stéréo
DE102014006997A1 (de) Verfahren, Vorrichtung und Erzeugnis für drahtlose immersive Audioübertragung
WO2014072513A1 (fr) Codage inverse non linéaire de signaux multicanaux
DE19911507A1 (de) Verfahren zur Verbesserung dreidimensionaler Klangwiedergabe
EP1471770B1 (fr) Procédé de géneration d'une fonction de transfert partielle approximée
EP2357854B1 (fr) Procédé et dispositif de production de signaux audio binauraux individuellement adaptables
DE112019001916T5 (de) Audioverarbeitungsvorrichtung, audioverarbeitungsverfahren und programm
DE112021003592T5 (de) Informationsverarbeitungsvorrichtung, Ausgabesteuerverfahren und Programm
EP0484354B1 (fr) Casque stereo pour la localisation en avant de phases auditives generees par des casques stereo
DE112006002548T5 (de) Vorrichtung und Verfahren zur Wiedergabe von virtuellem Zweikanal-Ton
WO2021122540A1 (fr) Procédé et système de transmission et de reproduction d'informations acoustiques
EP3937515A1 (fr) Émetteur électroacoustique à commande d'invariance
DE112019005814T5 (de) Optimale filtersätze zur unterdrückung von störungen durch übersprechen, die unter verwendung eines störfeldmodells erzeugt werden, und verfahren zur verwendung
DE112019004139T5 (de) Signalverarbeitungsvorrichtung, signalverarbeitungsverfahren und programm
DE19847689B4 (de) Vorrichtung und Verfahren zur dreidimensionalen Tonwiedergabe
EP3595334A2 (fr) Procédé de lecture audio dans un appareil auditif
EP0025509B1 (fr) Procédé de transmission stéréophonique et moyens pour la mise en oeuvre de ce procédé
DE3737873C2 (de) Verwendung von Hörsprechgarnituren zur Verbesserung der Sprachverständlichkeit in störschallerfüllter Umgebung
EP2503799B1 (fr) Procédé et système de calcul de fonctions HRTF par synthèse locale virtuelle de champ sonore

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

B565 Issuance of search results under rule 164(2) epc

Effective date: 20210301

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20220713