EP2551845B1 - Rauschmindernde Tonwiedergabe - Google Patents

Rauschmindernde Tonwiedergabe Download PDF

Info

Publication number
EP2551845B1
EP2551845B1 EP11175344.8A EP11175344A EP2551845B1 EP 2551845 B1 EP2551845 B1 EP 2551845B1 EP 11175344 A EP11175344 A EP 11175344A EP 2551845 B1 EP2551845 B1 EP 2551845B1
Authority
EP
European Patent Office
Prior art keywords
signal
transfer characteristic
filter
useful
secondary path
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.)
Active
Application number
EP11175344.8A
Other languages
English (en)
French (fr)
Other versions
EP2551845A1 (de
Inventor
Markus Christoph
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.)
Harman Becker Automotive Systems GmbH
Original Assignee
Harman Becker Automotive Systems 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 Harman Becker Automotive Systems GmbH filed Critical Harman Becker Automotive Systems GmbH
Priority to EP11175344.8A priority Critical patent/EP2551845B1/de
Priority to CA2783382A priority patent/CA2783382C/en
Priority to JP2012163857A priority patent/JP2013029834A/ja
Priority to CN201811432252.6A priority patent/CN109600698B/zh
Priority to US13/559,093 priority patent/US9491537B2/en
Priority to CN2012102616254A priority patent/CN102905208A/zh
Priority to CN201610404120.7A priority patent/CN106060715A/zh
Publication of EP2551845A1 publication Critical patent/EP2551845A1/de
Priority to JP2016129708A priority patent/JP2016218456A/ja
Application granted granted Critical
Publication of EP2551845B1 publication Critical patent/EP2551845B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17817—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17827—Desired external signals, e.g. pass-through audio such as music or speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • 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
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise

Definitions

  • a noise reducing sound reproduction system and, in particular, a noise reduction system which includes an earphone for allowing a user to enjoy, for example, reproduced music or the like, with reduced ambient noise.
  • active noise reduction systems also known as active noise cancellation/control (ANC) systems
  • the same loudspeakers in particular loudspeakers arranged in the two earphones of headphones
  • ANC active noise cancellation/control
  • the same loudspeakers are often used for both noise reduction and reproduction of desirable sound such as music or speech.
  • common noise reduction systems reduce the desirable sound to a certain degree, as well. Accordingly, either advanced electrical signal processing is required to compensate for this effect or the listener has to accept sound impressions that differ, depending on whether noise reduction is on or off.
  • GAN W S ET AL "AN INTEGRATED AUDIO AND ACTIVE NOISE CONTROL HEADSETS", IEEE TRANSACTIONS ON CONSUMER ELECTRONICS; IEEE SERVICE CENTER, NEW YORK, NY,US, vol. 48, no. 2, 1 May 2002 (2002-05-01), pages 242-247 , describes an integrated audio and active noise headset.
  • US2010/329473A1 discloses detecting a change in power of an output signal of a filter and controlling the filter dependent thereon.
  • EP1947642A1 discloses active noise control that employs a reference sound to adapt noise control.
  • a noise reducing sound reproduction system comprising: a loudspeaker that is connected to a loudspeaker input path; a microphone that is acoustically coupled to the loudspeaker via a secondary path and connected to a microphone output path; a first subtractor that is connected downstream of the microphone output path and a first useful-signal path; an active noise reduction filter that is connected downstream of the first subtractor; and a second subtractor that is connected downstream of the active noise reduction filter, downstream of second useful-signal path, and upstream of the loudspeaker input path.
  • the secondary path has a secondary path transfer characteristic.
  • Both useful-signal paths are supplied with a useful signal to be reproduced and at least one of the useful-signal paths comprise one or more spectrum shaping filters.
  • At least one of the spectrum shaping filters has a transfer characteristic that models the secondary path transfer characteristic.
  • the first useful-signal path comprises the at least one spectrum shaping filter and the at least one spectrum shaping filter that models the secondary path transfer characteristic linearizes a microphone signal on the microphone output path with regard to the useful signal.
  • the at least one spectrum shaping filter that models the secondary path transfer characteristic comprises at least two sub-filters. One of the sub-filters of the at least one spectrum shaping filter that models the secondary path transfer characteristic is a treble cut shelving filter.
  • a noise reducing sound reproduction method in which: an input signal is supplied to a loudspeaker by which it is acoustically radiated; the signal radiated by the loudspeaker is received by a microphone that is acoustically coupled to the loudspeaker via a secondary path that has a secondary path transfer characteristic and that provides a microphone output signal; from the microphone output signal a useful-signal is subtracted to generate a filter input signal; the filter input signal is filtered in an active noise reduction filter to generate an error signal; and the useful-signal is subtracted from the error signal to generate the loudspeaker input signal; and the useful-signal is filtered by one or more spectrum shaping filters prior to subtraction from the microphone output signal.
  • At least one of the spectrum shaping filters has a transfer characteristic that models the secondary path transfer characteristic.
  • the useful signal prior to subtraction from the microphone output signal, is filtered with the transfer characteristic of the at least one spectrum shaping filter that models the secondary path transfer characteristic, wherein the at least one spectrum shaping filter that models the secondary path transfer characteristic linearizes a microphone signal on the microphone output path with regard to the useful signal.
  • the filtering of the useful signal includes treble cut shelving filtering.
  • Feedback ANC systems are intended to reduce or even cancel a disturbing signal, such as noise, by providing at a listening site a noise reducing signal that ideally has the same amplitude over time but the opposite phase compared to the noise signal.
  • a noise reducing signal that ideally has the same amplitude over time but the opposite phase compared to the noise signal.
  • the noise signal and the noise reducing signal By superimposing the noise signal and the noise reducing signal, the resulting signal, also known as error signal, ideally tends toward zero.
  • the quality of the noise reduction depends on the quality of a so-called secondary path, i.e., the acoustic path between a loudspeaker and a microphone representing the listener's ear.
  • the quality of the noise reduction further depends on the quality of a so-called ANC filter that is connected between the microphone and the loudspeaker and that filters the error signal provided by the microphone such that, when the filtered error signal is reproduced by the loudspeaker, it further reduces the error signal.
  • ANC filter that is connected between the microphone and the loudspeaker and that filters the error signal provided by the microphone such that, when the filtered error signal is reproduced by the loudspeaker, it further reduces the error signal.
  • problems occur when additionally to the filtered error signal a useful signal such as music or speech is provided at the listening site, in particular by the loudspeaker that also reproduces the filtered error signal. Then, the useful signal may be deteriorated by the system as previously mentioned.
  • the loudspeaker and the microphone may be part of an acoustic sub-system (e.g., a loudspeaker-room-microphone system) having an input stage formed by the loudspeaker 3 and an output stage formed by the microphone; the sub-system being supplied with an electrical input signal and providing an electrical output signal.
  • acoustic sub-system e.g., a loudspeaker-room-microphone system
  • the loudspeaker and the microphone may be part of an acoustic sub-system (e.g., a loudspeaker-room-microphone system) having an input stage formed by the loudspeaker 3 and an output stage formed by the microphone; the sub-system being supplied with an electrical input signal and providing an electrical output signal.
  • “Path” means in this regard an electrical or acoustical connection that may include further elements such as signal conducting means, amplifiers, filters, etc.
  • a spectrum shaping filter is a filter in which the spectra of the input and output signal are different over frequency.
  • FIG. 1 is a block diagram illustrating a general feedback type active noise reduction (ANC) system in which a disturbing signal d[n], also referred to as noise signal, is transferred (radiated) to a listening site, e.g., a listener's ear, via a primary path 1.
  • the primary path 1 has a transfer characteristic of P(z).
  • an input signal v[n] is transferred (radiated) from a loudspeaker 3 to the listening site via a secondary path 2.
  • the secondary path 2 has a transfer characteristic of S(z).
  • a microphone 4 positioned at the listening site receives together with the disturbing signal d[n] the signals that arise from the loudspeaker 3.
  • the microphone 4 provides a microphone output signal y[n] that represents the sum of these received signals.
  • the microphone output signal y[n] is supplied as filter input signal u[n] to an ANC filter 5 that outputs to an adder 6 an error signal e[n].
  • the ANC filter 5, which may be an adaptive filter, has a transfer characteristic of W(z).
  • the adder 6 also receives an optionally pre-filtered, e.g., with a spectrum shaping filter (not shown in the drawings) useful signal x[n] such as music or speech and provides an input signal v[n] to the loudspeaker 3.
  • the signals x[n], y[n], e[n], u[n] and v[n] are in the discrete time domain.
  • their spectral representations X(z), Y(z), E(z), U(z) and V(z) are used.
  • the useful signal transfer characteristic M(z) approaches 0 when the transfer characteristic W(z) of the ANC filter 5 increases, while the secondary path transfer function S(z) remains neutral, i.e. at levels around 1, i.e., 0[dB]. For this reason, the useful signal x[n] has to be adapted accordingly to ensure that the useful signal x[n] is apprehended identically by a listener when ANC is on or off. Furthermore, the useful signal transfer characteristic M(z) also depends on the transfer characteristic S(z) of the secondary path 2 to the effect that the adaption of the useful signal x[n] also depends on the transfer characteristic S(z) and its fluctuations due to aging, temperature, change of listener etc. so that a certain difference between "on” and "off” will be apparent.
  • the useful signal x[n] is supplied to the acoustic sub-system (loudspeaker, room, microphone) at the adder 6 connected upstream of the loudspeaker 3, in the system of FIG. 2 the useful signal x[n] is supplied at the microphone 4. Therefore, in the system of FIG. 2 , the adder 6 is omitted and an adder 7 is arranged downstream of microphone 4 to sum up the, e.g., pre-filtered, useful signal x[n] and the microphone output signal y[n].
  • M z W z ⁇ S z / 1 ⁇ W z ⁇ S z lim W z ⁇ S z ⁇ 1 M z ⁇ M z ⁇ ⁇ lim W z ⁇ S z ⁇ 0 M z ⁇ M z ⁇ 0 lim W z ⁇ S z ⁇ ⁇ ⁇ M z ⁇ M z ⁇ 1 .
  • the useful signal transfer characteristic M(z) approaches 1 when the open loop transfer characteristic (W(z) ⁇ S(z)) increases or decreases and approaches 0 when the open loop transfer characteristic (W(z) ⁇ S(z)) approaches 0.
  • the useful signal x[n] has to be adapted additionally in higher spectral ranges to ensure that the useful signal x[n] is apprehended identically by a listener when ANC is on or off. Compensation in higher spectral ranges is, however, quite difficult so that a certain difference between "on” and "off” will be apparent.
  • the useful signal transfer characteristic M(z) does not depend on the transfer characteristic S(z) of the secondary path 2 and its fluctuations due to aging, temperature, change of listener etc.
  • FIG. 3 is a block diagram illustrating a general feedback type active noise reduction system in which the useful signal is supplied to both, the loudspeaker path and the microphone path.
  • the primary path 1 is omitted below notwithstanding that noise (disturbing signal d[n]) is still present.
  • the system of FIG. 3 is based on the system of FIG. 1 , however, with an additional subtractor 8 that subtracts the useful signal x[n] from the microphone output signal y[n] to form the ANC filter input signal u[n] and with a subtractor 9 that substitutes adder 6 and subtracts the useful signal x[n] from error signal e[n].
  • M z S z ⁇ W z ⁇ S z / 1 ⁇ W z ⁇ S z lim W z ⁇ S z ⁇ 1 M z ⁇ M z ⁇ ⁇ lim W z ⁇ S z ⁇ 0 M z ⁇ M z ⁇ S z lim W z ⁇ S z ⁇ ⁇ ⁇ M z ⁇ M z ⁇ 1 .
  • FIG. 4 a system is shown that is based on the system of FIG. 3 and that additionally includes an equalizing filter 10 connected upstream of the subtractor 9 in order to filter the useful signal x[n] with the inverse secondary path transfer function 1/S(z).
  • the microphone output signal y[n] is identical to the useful signal x[n], which means that signal x[n] is not altered by the system if the equalizer filter is exact the inverse of the secondary path transfer characteristic S(z).
  • This configuration acts as an ideal linearizer, i.e. it compensates for any deteriorations of the useful signal due to its transfer from the loudspeaker 3 to the microphone 4 representing the listener's ear.
  • FIG. 5 a system is shown that is based on the system of FIG. 3 and that additionally includes an equalizing filter 10 connected upstream of the subtractor 8 in order to filter the useful signal x[n] with the secondary path transfer function S(z).
  • the useful signal transfer characteristic M(z) is identical with the secondary path transfer characteristic S(Z) when the ANC system is active.
  • the useful signal transfer characteristic M(z) is also identical with the secondary path transfer characteristic S(Z).
  • the ANC filter 5 and the equalizing filters 10 and 11 may be fixed filters with constant transfer characteristics or adaptive filters with controllable transfer characteristics.
  • the adaptive structure of a filter per se is indicated by an arrow underlying the respective block and the optionality of the adaptive structure is indicated by a broken line.
  • the system shown in FIG. 5 is, for example, applicable in headphones in which useful signals, such as music or speech, are reproduced under different conditions in terms of noise and the listener may appreciate being able to switch off the ANC system, in particular when no noise is present, without experiencing any audible difference between the active and non-active state of the ANC system.
  • the systems presented herein are not applicable in headphones only, but also in all other fields in which occasional noise reduction is desired.
  • FIG. 6 illustrates an exemplary earphone with which the present active noise reduction systems may be used.
  • the earphone may be, together with another identical earphone, part of a headphone (not shown) and may be acoustically coupled to a listener's ear 12.
  • the ear 12 is exposed via primary path 1 to the disturbing signal d[n], e.g., ambient noise.
  • the earphone comprises a cup-like housing 14 with an aperture 15 that may be covered by a sound permeable cover, e.g., a grill, a grid or any other sound permeable structure or material.
  • the loudspeaker 3 radiates sound to the ear 12 and is arranged at the aperture 15 of the housing 14, both forming an earphone cavity 13.
  • the cavity 13 may be airtight or vented by any means, e.g., by means of a port, vent, opening, etc.
  • the microphone 4 is positioned in front of the loudspeaker 3.
  • An acoustic path 17 extends from the speaker 3 to the ear 12 and has a transfer characteristic which is approximated for noise control purposes by the transfer characteristic of the secondary path 2 which extends from the loudspeaker 3 to the microphone 4.
  • analog circuitry In mobile devices such as headphones, the space and energy available for the ANC system is quite limited. Digital circuitry may be too space and energy consuming and in mobile devices analog circuitry is often the preferred in the design of ANC systems.
  • analog circuitry allows only for a very limited complexity of the ANC system and thus it is hard to correctly model the secondary path solely by analog means.
  • analog filters used in an ANC system are often fixed filters or very simple adaptive filters because they are easy to build, have low energy consumption and require little space.
  • FIGS. 4, 5 and 7 also provide good results when employing analog circuitry as there is a minor ( FIG. 4 ) or even no
  • FIGS. 5 and 7 dependency on the secondary path behavior. Furthermore, the systems of FIGS. 5 and 7 allow for a good estimation of the necessary transfer characteristic of the equalization filter based on the ANC filter transfer characteristic W(z), as well as on the secondary path filter characteristic S(z), both forming the open loop transfer characteristic W(z) ⁇ S(z), which, in principal, has only minor fluctuations, and based on the assessment of the acoustic properties of the headphone when attached to a listener's head.
  • the ANC filter 5 will usually have a transfer characteristic that tends to have lower gain at lower frequencies with an increasing gain over frequency to a maximum gain followed by a decrease of gain over frequency down to loop gain.
  • the loop inherent in the ANC system keeps the system linear in a frequency range of, e.g., below 1 kHz and thus renders any equalization redundant in this frequency range.
  • the ANC filter 5 has almost no boosting or cutting effects and, accordingly, no linearization effects.
  • the useful signal transfer characteristic M(z) experiences a boost at higher frequencies that has to be compensated for by means of a respective filter, e.g.
  • a shelving filter additional to an equalizing filter.
  • boosts and cuts may occur in the frequency range between 1 kHz and 3 kHz.
  • boosts are more disturbing than cuts and thus it may be sufficient to compensate for boosts in the transfer characteristic by correspondingly designed cut filters.
  • a second equalizing filter may be used.
  • FIG. 7 shows an exemplary ANC system that employs (at least) two filters 18 and 19 (sub-filters) instead of a single filter 11 as in the system of FIG. 5 .
  • a treble cut shelving filter e.g., filter 18
  • a treble cut equalizing filter e.g., filter 19
  • S(z) S 1 (z) ⁇ S 2 (z)
  • a treble boost equalizing filter may be implemented as, e.g., filter 18 and a treble cut equalizing filter as, e.g., filter 19.
  • three filters may be employed, e.g., one treble cut shelving filter and two treble boost/cut equalizing filters.
  • the number of filters used may depend on many other aspects such as costs, noise behavior of the filters, acoustic properties of the headphone, delay time of the system, space available for implementing the system, etc.
  • FIG. 8 is a schematic diagram of the transfer characteristics a, b of shelving filters applicable in the system of FIG. 7 .
  • a first order treble boost (+9 dB) shelving filter (a) and a bass cut (-3 dB) shelving filter (b) are shown.
  • FIG. 9 is a schematic diagram of the transfer characteristics c, d of equalizing filters applicable in the system of FIG. 7 .
  • One (c) of the equalizing filters provides a 9 dB boost at 1 kHz and the other (d) a 6 dB cut at 100 Hz having a higher Q and, thus, a sharper bandwidth.
  • Shelving filters are usually simple first-order filters which alter the relative gains between frequencies much higher and much lower than the corner frequencies.
  • a low or bass shelf is adjusted to affect the gain of lower frequencies while having no effect well above its corner frequency.
  • a high or treble shelf adjusts the gain of higher frequencies only.
  • a single equalizer filter implements a second-order filter function. This involves three adjustments: selection of the center frequency, adjustment of the quality (Q) factor, which determines the sharpness of the bandwidth, and the level or gain which determines how much the selected center frequency is boosted or cut relative to frequencies (much) above or below the center frequency.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Signal Processing (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Otolaryngology (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Headphones And Earphones (AREA)

Claims (9)

  1. Geräuschminderndes Tonwiedergabesystem, umfassend:
    einen Lautsprecher (3), der mit einem Lautsprechereingangspfad verbunden ist;
    ein Mikrofon (4), das akustisch mit dem Lautsprecher (3) über einen sekundären Pfad (2) gekoppelt ist und mit einem Mikrofonausgangspfad verbunden ist;
    einen ersten Subtrahierer (8), der stromabwärts des Mikrofonausgangspfads und eines ersten Nutzsignalpfads verbunden ist;
    einen aktiven Geräuschminderungsfilter (5), der stromabwärts des ersten Subtrahierers (8) verbunden ist; und
    einen zweiten Subtrahierer (9), der stromabwärts des aktiven Geräuschminderungsfilters (5), stromabwärts eines zweiten Nutzsignalpfads und stromaufwärts des Lautsprechereingangspfads verbunden ist, wobei:
    der sekundäre Pfad (2) eine Sekundärpfadübertragungscharakteristik (S(z)) aufweist;
    beide Nutzsignalpfade mit einem Nutzsignal (x[n]), das wiederzugeben ist, versorgt werden; und
    mindestens einer der Nutzsignalpfade einen oder mehrere spektrumsformende(n) Filter (10, 11, 18, 19, 20) umfasst, wobei mindestens einer der spektrumsformenden Filter (11) eine Übertragungscharakteristik aufweist, die die Sekundärpfadübertragungscharakteristik (S(z)) nachbildet;
    der erste Nutzsignalpfad den mindestens einen spektrumsformenden Filter (11) umfasst und der mindestens eine spektrumsformende Filter (11), der die Sekundärpfadübertragungscharakteristik nachbildet, ein Mikrofonsignal (y[n]) am Mikrofonausgangspfad in Bezug auf das Nutzsignal (x[n]) linearisiert;
    der mindestens eine spektrumsformende Filter (11), der die Sekundärpfadübertragungscharakteristik nachbildet, mindestens zwei Unterfilter (18, 19) umfasst; und
    einer aus den Unterfiltern (18, 19) des mindestens einen spektrumsformenden Filters (11), der die Sekundärpfadübertragungscharakteristik nachbildet, ein Tiefpass-Kuhschwanzfilter ist.
  2. System nach Anspruch 1, wobei mindestens einer der Unterfilter (18, 19) des mindestens einen spektrumsformenden Filters (11), der die Sekundärpfadübertragungscharakteristik nachbildet, ein Entzerrerfilter ist.
  3. System nach einem der Ansprüche 1 oder 2, wobei der mindestens eine der Unterfilter (18, 19) des mindestens einen Entzerrerfilters ein Tiefpass-Entzerrerfilter ist.
  4. System nach einem der Ansprüche 1 bis 3, wobei der zweite Nutzsignalpfad einen weiteren spektrumsformenden Filter (10) umfasst, der eine Übertragungscharakteristik aufweist, die mit der umgekehrten Sekundärpfadübertragungscharakteristik (1/S(z)) identisch ist.
  5. System nach einem der Ansprüche 1-4, wobei mindestens einer aus dem aktiven Geräuschminderungsfilter (5), dem mindestens einen spektrumsformenden Filter (11), der die Sekundärpfadübertragungscharakteristik nachbildet, und dem anderen spektrumsformenden Filter (10) ein adaptiver Filter ist.
  6. Verfahren zur geräuschmindernden Tonwiedergabe, wobei:
    ein Eingangssignal (v[n]) an einen Lautsprecher (3) geliefert wird, durch den es akustisch abgestrahlt wird;
    das Signal, das von dem Lautsprecher (3) abgestrahlt wird, von einem Mikrofon (4) empfangen wird, das akustisch mit dem Lautsprecher (3) über einen Sekundärpfad (2) gekoppelt ist, der eine Sekundärpfadübertragungscharakteristik (S(z)) aufweist und der ein Mikrofonausgangssignal (y[n]) bereitstellt;
    das Mikrofonausgangssignal (y[n]) von einem Nutzsignal (x[n]) subtrahiert wird, um ein Filtereingangssignal (u[n]) zu erzeugen;
    das Filtereingangssignal (u[n]) in einem aktiven Geräuschminderungsfilter (5) gefiltert wird, um ein Fehlersignal (e[n]) zu erzeugen; und
    das Nutzsignal (x[n]) von dem Fehlersignal (e[n]) subtrahiert wird, um das Lautsprechereingangssignal (v[n]) zu erzeugen; und
    das Nutzsignal (x[n]) von einem oder mehreren spektrumsformenden Filtern (10, 11, 18, 19, 20, 21) vor der Subtraktion vom Mikrofonausgangssignal (y[n]) gefiltert wird, wobei mindestens einer der spektrumsformenden Filter (11) eine Übertragungscharakteristik aufweist, die die Sekundärpfadübertragungscharakteristik (S(z)) nachbildet;
    das Nutzsignal (x[n]) vor der Subtraktion von dem Mikrofonausgangssignal (y[n]) mit der Übertragungscharakteristik des mindestens einen spektrumsformenden Filters (11), der die Sekundärpfadübertragungscharakteristik nachbildet, gefiltert wird, wobei der mindestens eine spektrumsformende Filter (11), der die Sekundärpfadübertragungscharakteristik nachbildet, ein Mikrofonsignal (y[n]) an dem Mikrofonausgangspfad in Bezug auf das Nutzsignal (x[n]) linearisiert;
    das Filtern des Nutzsignals (x[n]) ein Tiefpass-Kuhschwanzfiltern beinhaltet.
  7. Verfahren nach Anspruch 6, wobei alle spektrumsformenden Filter (10, 11, 18, 19, 20, 21) insgesamt die Sekundärpfadübertragungscharakteristik (S(z)) nachbilden.
  8. Verfahren nach Anspruch 6 oder 7, wobei das Filtern des Nutzsignals (x[n]) ein Entzerren beinhaltet.
  9. Verfahren nach einem der Ansprüche 6 bis 8, wobei das Nutzsignal (x[n]) vor der Subtraktion vom Lautsprechereingangssignal (v[n]) mit einer Übertragungscharakteristik gefiltert wird, die mit der umgekehrten Sekundärpfadübertragungscharakteristik (1/S(z)) identisch ist.
EP11175344.8A 2011-07-26 2011-07-26 Rauschmindernde Tonwiedergabe Active EP2551845B1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP11175344.8A EP2551845B1 (de) 2011-07-26 2011-07-26 Rauschmindernde Tonwiedergabe
CA2783382A CA2783382C (en) 2011-07-26 2012-07-19 Noise reducing sound reproduction
JP2012163857A JP2013029834A (ja) 2011-07-26 2012-07-24 ノイズ除去音声再生
US13/559,093 US9491537B2 (en) 2011-07-26 2012-07-26 Noise reducing sound reproduction system
CN201811432252.6A CN109600698B (zh) 2011-07-26 2012-07-26 噪声降低的声音再现系统及方法
CN2012102616254A CN102905208A (zh) 2011-07-26 2012-07-26 噪声降低的声音再现
CN201610404120.7A CN106060715A (zh) 2011-07-26 2012-07-26 噪声降低的声音再现
JP2016129708A JP2016218456A (ja) 2011-07-26 2016-06-30 ノイズ除去音声再生

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11175344.8A EP2551845B1 (de) 2011-07-26 2011-07-26 Rauschmindernde Tonwiedergabe

Publications (2)

Publication Number Publication Date
EP2551845A1 EP2551845A1 (de) 2013-01-30
EP2551845B1 true EP2551845B1 (de) 2020-04-01

Family

ID=44763786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11175344.8A Active EP2551845B1 (de) 2011-07-26 2011-07-26 Rauschmindernde Tonwiedergabe

Country Status (4)

Country Link
EP (1) EP2551845B1 (de)
JP (2) JP2013029834A (de)
CN (3) CN109600698B (de)
CA (1) CA2783382C (de)

Families Citing this family (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101909432B1 (ko) 2010-12-03 2018-10-18 씨러스 로직 인코포레이티드 개인용 오디오 디바이스에서 적응형 잡음 제거기의 실수 제어
US8908877B2 (en) 2010-12-03 2014-12-09 Cirrus Logic, Inc. Ear-coupling detection and adjustment of adaptive response in noise-canceling in personal audio devices
US9824677B2 (en) 2011-06-03 2017-11-21 Cirrus Logic, Inc. Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
US9318094B2 (en) 2011-06-03 2016-04-19 Cirrus Logic, Inc. Adaptive noise canceling architecture for a personal audio device
US8948407B2 (en) 2011-06-03 2015-02-03 Cirrus Logic, Inc. Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
US8958571B2 (en) 2011-06-03 2015-02-17 Cirrus Logic, Inc. MIC covering detection in personal audio devices
US9325821B1 (en) 2011-09-30 2016-04-26 Cirrus Logic, Inc. Sidetone management in an adaptive noise canceling (ANC) system including secondary path modeling
US9123321B2 (en) 2012-05-10 2015-09-01 Cirrus Logic, Inc. Sequenced adaptation of anti-noise generator response and secondary path response in an adaptive noise canceling system
US9318090B2 (en) 2012-05-10 2016-04-19 Cirrus Logic, Inc. Downlink tone detection and adaptation of a secondary path response model in an adaptive noise canceling system
US9319781B2 (en) 2012-05-10 2016-04-19 Cirrus Logic, Inc. Frequency and direction-dependent ambient sound handling in personal audio devices having adaptive noise cancellation (ANC)
US9532139B1 (en) 2012-09-14 2016-12-27 Cirrus Logic, Inc. Dual-microphone frequency amplitude response self-calibration
US9369798B1 (en) 2013-03-12 2016-06-14 Cirrus Logic, Inc. Internal dynamic range control in an adaptive noise cancellation (ANC) system
US9414150B2 (en) 2013-03-14 2016-08-09 Cirrus Logic, Inc. Low-latency multi-driver adaptive noise canceling (ANC) system for a personal audio device
US9324311B1 (en) 2013-03-15 2016-04-26 Cirrus Logic, Inc. Robust adaptive noise canceling (ANC) in a personal audio device
US10206032B2 (en) 2013-04-10 2019-02-12 Cirrus Logic, Inc. Systems and methods for multi-mode adaptive noise cancellation for audio headsets
US9066176B2 (en) 2013-04-15 2015-06-23 Cirrus Logic, Inc. Systems and methods for adaptive noise cancellation including dynamic bias of coefficients of an adaptive noise cancellation system
US9462376B2 (en) 2013-04-16 2016-10-04 Cirrus Logic, Inc. Systems and methods for hybrid adaptive noise cancellation
US9460701B2 (en) 2013-04-17 2016-10-04 Cirrus Logic, Inc. Systems and methods for adaptive noise cancellation by biasing anti-noise level
US9478210B2 (en) 2013-04-17 2016-10-25 Cirrus Logic, Inc. Systems and methods for hybrid adaptive noise cancellation
US9578432B1 (en) 2013-04-24 2017-02-21 Cirrus Logic, Inc. Metric and tool to evaluate secondary path design in adaptive noise cancellation systems
US9264808B2 (en) 2013-06-14 2016-02-16 Cirrus Logic, Inc. Systems and methods for detection and cancellation of narrow-band noise
US9392364B1 (en) 2013-08-15 2016-07-12 Cirrus Logic, Inc. Virtual microphone for adaptive noise cancellation in personal audio devices
US9666176B2 (en) 2013-09-13 2017-05-30 Cirrus Logic, Inc. Systems and methods for adaptive noise cancellation by adaptively shaping internal white noise to train a secondary path
US9620101B1 (en) 2013-10-08 2017-04-11 Cirrus Logic, Inc. Systems and methods for maintaining playback fidelity in an audio system with adaptive noise cancellation
CN103686556B (zh) * 2013-11-19 2017-02-08 歌尔股份有限公司 微型扬声器模组和增强其频率响应的方法以及电子设备
US10382864B2 (en) 2013-12-10 2019-08-13 Cirrus Logic, Inc. Systems and methods for providing adaptive playback equalization in an audio device
US10219071B2 (en) 2013-12-10 2019-02-26 Cirrus Logic, Inc. Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation
US9704472B2 (en) 2013-12-10 2017-07-11 Cirrus Logic, Inc. Systems and methods for sharing secondary path information between audio channels in an adaptive noise cancellation system
US9369557B2 (en) 2014-03-05 2016-06-14 Cirrus Logic, Inc. Frequency-dependent sidetone calibration
US9479860B2 (en) 2014-03-07 2016-10-25 Cirrus Logic, Inc. Systems and methods for enhancing performance of audio transducer based on detection of transducer status
US9319784B2 (en) 2014-04-14 2016-04-19 Cirrus Logic, Inc. Frequency-shaped noise-based adaptation of secondary path adaptive response in noise-canceling personal audio devices
US10181315B2 (en) 2014-06-13 2019-01-15 Cirrus Logic, Inc. Systems and methods for selectively enabling and disabling adaptation of an adaptive noise cancellation system
US9478212B1 (en) 2014-09-03 2016-10-25 Cirrus Logic, Inc. Systems and methods for use of adaptive secondary path estimate to control equalization in an audio device
US9552805B2 (en) 2014-12-19 2017-01-24 Cirrus Logic, Inc. Systems and methods for performance and stability control for feedback adaptive noise cancellation
TWI562763B (en) * 2015-07-03 2016-12-21 Hit Inc Portable audiometry device
US10026388B2 (en) 2015-08-20 2018-07-17 Cirrus Logic, Inc. Feedback adaptive noise cancellation (ANC) controller and method having a feedback response partially provided by a fixed-response filter
US9578415B1 (en) 2015-08-21 2017-02-21 Cirrus Logic, Inc. Hybrid adaptive noise cancellation system with filtered error microphone signal
US10152960B2 (en) * 2015-09-22 2018-12-11 Cirrus Logic, Inc. Systems and methods for distributed adaptive noise cancellation
EP3182406B1 (de) * 2015-12-16 2020-04-01 Harman Becker Automotive Systems GmbH Tonwiedergabe mit aktiver rauschsteuerung in einem helm
EP3185241B1 (de) * 2015-12-23 2020-02-05 Harman Becker Automotive Systems GmbH Extern gekoppeltes lautsprechersystem
US10013966B2 (en) 2016-03-15 2018-07-03 Cirrus Logic, Inc. Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device
EP3486896B1 (de) * 2017-11-16 2023-08-23 ams AG Rauschunterdrückungssystem und signalverarbeitungsverfahren
CN108156551A (zh) * 2018-02-09 2018-06-12 会听声学科技（北京）有限公司 主动降噪系统、主动降噪耳机及主动降噪方法
JP7165864B2 (ja) 2018-09-28 2022-11-07 パナソニックＩｐマネジメント株式会社 機器制御システム、移動体、機器制御方法及びプログラム
CN111883097A (zh) * 2020-08-05 2020-11-03 西安艾科特声学科技有限公司 一种基于虚拟传感的列车驾驶室有源噪声控制系统
CN113409755B (zh) * 2021-07-26 2023-10-31 北京安声浩朗科技有限公司 主动降噪方法、装置及主动降噪耳机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023419A1 (en) * 1993-04-01 1994-10-13 Noise Cancellation Technologies, Inc. Improved audio reproduction system
WO2001067434A1 (en) * 2000-03-07 2001-09-13 Slab Dsp Limited Active noise reduction system

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03274895A (ja) * 1990-03-24 1991-12-05 Calsonic Corp アクティブ・ノイズ・キャンセラー
JP3002049B2 (ja) * 1992-02-06 2000-01-24 松下電器産業株式会社 消音装置
US7840012B2 (en) * 2003-07-28 2010-11-23 Koninklijke Philips Electronics N.V. Audio conditioning apparatus, method and computer program product
US8189803B2 (en) * 2004-06-15 2012-05-29 Bose Corporation Noise reduction headset
WO2007046435A1 (ja) * 2005-10-21 2007-04-26 Matsushita Electric Industrial Co., Ltd. 騒音制御装置
US8270625B2 (en) * 2006-12-06 2012-09-18 Brigham Young University Secondary path modeling for active noise control
EP1947642B1 (de) * 2007-01-16 2018-06-13 Apple Inc. Aktives geräuschdämpfungssystem
JP4722878B2 (ja) * 2007-04-19 2011-07-13 ソニー株式会社 ノイズ低減装置および音響再生装置
JP4967894B2 (ja) * 2007-07-25 2012-07-04 ソニー株式会社 信号処理装置、信号処理方法、プログラム、ノイズキャンセリングシステム
JP5114611B2 (ja) * 2007-09-28 2013-01-09 株式会社ＤｉＭＡＧＩＣ Ｃｏｒｐｏｒａｔｉｏｎ ノイズ制御システム
US8718289B2 (en) * 2009-01-12 2014-05-06 Harman International Industries, Incorporated System for active noise control with parallel adaptive filter configuration
US9344051B2 (en) * 2009-06-29 2016-05-17 Nokia Technologies Oy Apparatus, method and storage medium for performing adaptive audio equalization
EP2284831B1 (de) * 2009-07-30 2012-03-21 Nxp B.V. Verfahren und Vorrichtung zur aktiven Geräuschsminderung unter Anwendung von Wahrnehmungsmaskierung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023419A1 (en) * 1993-04-01 1994-10-13 Noise Cancellation Technologies, Inc. Improved audio reproduction system
WO2001067434A1 (en) * 2000-03-07 2001-09-13 Slab Dsp Limited Active noise reduction system

Also Published As

Publication number Publication date
CN102905208A (zh) 2013-01-30
CA2783382C (en) 2016-02-23
JP2013029834A (ja) 2013-02-07
CN109600698B (zh) 2021-07-30
JP2016218456A (ja) 2016-12-22
CN109600698A (zh) 2019-04-09
EP2551845A1 (de) 2013-01-30
CN106060715A (zh) 2016-10-26
CA2783382A1 (en) 2013-01-26

Similar Documents

Publication Publication Date Title
EP2551845B1 (de) Rauschmindernde Tonwiedergabe
US10056066B2 (en) Active noise reduction
EP2551846B1 (de) Rauschmindernde Tonwiedergabe
US8422691B2 (en) Audio outputting device, audio outputting method, noise reducing device, noise reducing method, program for noise reduction processing, noise reducing audio outputting device, and noise reducing audio outputting method
EP2885872B1 (de) Hörgerät mit pegel- und frequenzabhängiger verstärkung
US10235985B2 (en) Externally coupled loudspeaker system for a vehicle
CN111052226A (zh) 噪声消除系统、噪声消除头戴式耳机和噪声消除方法
US11062687B2 (en) Compensation for microphone roll-off variation in acoustic devices
EP3977443A1 (de) Mehrzweckmikrofon bei akustischen geräten
US9491537B2 (en) Noise reducing sound reproduction system
KR100952400B1 (ko) 원하지 않는 라우드 스피커 신호들을 제거하는 방법
US11335315B2 (en) Wearable electronic device with low frequency noise reduction

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

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

AX Request for extension of the european patent

Extension state: BA ME

17P Request for examination filed

Effective date: 20130726

RBV Designated contracting states (corrected)

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

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

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20170609

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602011065940

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: G10K0011178000

Ipc: H04S0007000000

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

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

Free format text: STATUS: GRANT OF PATENT IS INTENDED

RIC1 Information provided on ipc code assigned before grant

Ipc: H04S 7/00 20060101AFI20191025BHEP

Ipc: H04R 3/00 20060101ALI20191025BHEP

Ipc: H04R 1/10 20060101ALI20191025BHEP

INTG Intention to grant announced

Effective date: 20191112

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

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

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

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

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: AT

Ref legal event code: REF

Ref document number: 1252921

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200415

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602011065940

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200701

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20200401

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200801

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200701

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200702

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200817

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1252921

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602011065940

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

26N No opposition filed

Effective date: 20210112

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20200731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200731

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200726

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200731

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200726

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200401

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230526

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20230620

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230620

Year of fee payment: 13