EP2612437A1 - Spectrally uncolored optimal croostalk cancellation for audio through loudspeakers - Google Patents
Spectrally uncolored optimal croostalk cancellation for audio through loudspeakersInfo
- Publication number
- EP2612437A1 EP2612437A1 EP11825672.6A EP11825672A EP2612437A1 EP 2612437 A1 EP2612437 A1 EP 2612437A1 EP 11825672 A EP11825672 A EP 11825672A EP 2612437 A1 EP2612437 A1 EP 2612437A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- audio
- frequency
- xtc
- loudspeakers
- audio signals
- 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.)
- Granted
Links
- 230000004044 response Effects 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000011159 matrix material Substances 0.000 claims abstract description 36
- 238000012546 transfer Methods 0.000 claims abstract description 33
- 230000001419 dependent effect Effects 0.000 claims abstract description 25
- 230000005236 sound signal Effects 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 12
- 230000003595 spectral effect Effects 0.000 abstract description 35
- 238000005457 optimization Methods 0.000 abstract description 8
- 238000001228 spectrum Methods 0.000 description 55
- 230000006870 function Effects 0.000 description 23
- 210000005069 ears Anatomy 0.000 description 22
- 230000003447 ipsilateral effect Effects 0.000 description 14
- 238000013461 design Methods 0.000 description 9
- 210000003128 head Anatomy 0.000 description 9
- 239000013598 vector Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 235000009508 confectionery Nutrition 0.000 description 4
- 210000000613 ear canal Anatomy 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004091 panning Methods 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000000624 ear auricle Anatomy 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
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
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing
-
- 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
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
-
- 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
- Binaural audio with loudspeakers also known as transauralization, aims to reproduce, at the entrance of each of the listener's ear canals, the sound pressure signals recorded on only the ipsilateral channel of a stereo signal. That is, only the sound signal of the left stereo channel is reproduced at the left ear and only the sound signal of the right stereo channel is reproduced at the right ear.
- the source signal was encoded with a head-related transfer function (HRTF) of the listener, or includes the proper interaural time difference (ITD) and interaural level difference (ILD) cues
- HRTF head-related transfer function
- ITD interaural time difference
- ILD interaural level difference
- Crosstalk occurs when the left ear (right ear) hears sounds from the right (left) audio channel, originating from the light speaker (left speaker). In other words, crosstalk occurs when the sound on one of the stereo channels is heard by the contralateral ear of the listener.
- Crosstalk corrupts HRTF information and ITD or ILD cues so that a listener may not properly or completely comprehend the soundfield's binaural cues that are embedded in the recording. Therefore, approaching the goal of BAL requires an effective cancellation of this unintended crosstalk, i.e. crosstalk cancellation or XTC for short.
- Dl Severe spectral coloration to the sound heard by the listener, even if that listener is sitting in the intended sweet spot.
- D3 Severe dynamic range loss when the sound is processed through the XTC filter or processor (while avoiding distortion and/or clipping).
- a method and system for calculating the frequency-dependent regularization parameter (FDRP) used in inverting the analytically derived or experimentally measured system transfer matrix for crosstalk cancellation (XTC) filter design is described.
- the method relies on calculating the FDRP that results in a flat amplitude vs frequency response at the loudspeakers (as opposed to a flat amplitude vs frequency response at the ears of the listener, as inherently done in prior art methods) thus forcing XTC to be effected into the phase domain only and relieving the XTC filter from the drawbacks of audible spectral coloration and dynamic range loss.
- XTC filters that yield optimal XTC levels over any desired portion of the audio band, impose no spectral coloration on the processed sound beyond the spectral coloration inherent in the playback hardware and/or loudspeakers, and cause no dynamic range loss.
- XTC filters designed with this method and used in the system are not only optimal but, due to their being free from Drawbacks Dl , D2 and D3, allow for a most natural and spectrally transparent 3D audio reproduction of binaural or stereo audio through loudspeakers.
- the method and system do not attempt to correct the spectral characteristics of the playback hardware, and therefore are best suited for use with audio playback hardware and loudspeakers that are designed to meet a desired spectral fidelity level without the help of additional signal processing for spectral correction.
- FIG. 1 is a diagram of a listener and a two-source model
- FIG. 2 is a plot of the frequency responses of the perfect XTC filter at the loudspeakers
- FIG. 3 is a plot showing the effects of regularization on the envelope spectrum at the loudspeakers
- FIG. 4 shows the effects of regularization on the crosstalk cancellation spectrum
- FIG. 5 is a plot showing the envelope spectrum at the loudspeakers
- FIG. 6 is a flow chart of the method of the present invention.
- FIG. 7 shows four (windowed) measured impulse responses (IR) representing the transfer function in the time domain.
- FIG. 8 is a graph showing measured spectra associated with a perfect XTC filter
- FIG. 9 is a graph showing measured spectra for an XTC filter of the present invention.
- an idealized situation consisting of two point sources (idealized loudspeakers) 12, 14 in free space (no sound reflections) and two listening points 16, 18 corresponding to the location of the ears of an idealized listener 20 (no HRTF).
- actual data corresponding to the impulse responses of real loudspeakers in a real room measured at the ear canal entrances of a dummy head will be used.
- /, and / 2 are the path lengths between any of the two sources 12, 14 and the ipsilateral and contralateral ear, respectively, as shown in Figure 1.
- uppercase letters represent frequency variables
- lowercase represent time-domain variables
- uppercase bold letters represent matrices
- lowercase bold letters represent vectors
- ⁇ is the effective distance between the entrances of the ear canals, and / is the distance between either source and the interaural mid-point of the listener.
- ⁇ 2 ⁇ is the loudspeaker span.
- Arsin( ⁇ ) as in many loudspeaker-based listening set-ups, which leads to Another important parameter is the time delay, defined as the time it takes a sound wave to traverse the path length difference ⁇ / .
- the received signal at the listener's left ear 16 and the received signal at the listener's right ear 18 may be written in vector form as:
- a (8) which, in the time domain, is a transmission delay (divided by the constant /, ) that does not affect the shape of the received signal.
- R i.e., R LL (ico) and R I ⁇ R (ico)
- R LL (ico) and R I ⁇ R (ico) represent the ipsilateral transmission of the recorded sound signal to the ears
- off-diagonal elements i.e., R RL (ioj) and R l R ⁇ ico)
- R RL (ioj) and R l R ⁇ ico) represent the undesired contralateral transmission, i.e., the crosstalk.
- S(a>) is the envelope spectrum that describes the maximum amplitude that could be expected at the loudspeakers, and is given by
- a perfect crosstalk cancellation (P-XTC) filter may be defined as one that, theoretically, yields infinite crosstalk cancellation at the ears of the listener, for all frequencies.
- the spectra has a frequency varying behavior at the sources
- Fig. 2 shows the frequency responses of a Perfect XTC filter at the loudspeakers: amplitude envelope (curve 22), side image (curve 24), and central image (curve 26).
- the envelope peaks correspond to a boost of
- the peaks and minima in the condition number occur at the same frequencies as those of the amplitude envelope spectrum at the loudspeakers, $ m .
- the minima have a condition number of unity (the lowest possible value), which implies that the XTC filter resulting from the inversion of C is most robust (i.e., least sensitive to errors in the transfer
- the matrix inversion resulting in the P- XTC filter becomes ill-conditioned, or in other words, infinitely sensitive to errors.
- the sliglitest misalignment for instance, of the listener's head, would thus result in a severe loss in XTC control at the ears (at and near these frequencies) which, in turn, causes the severe spectral coloration in S l?i (fe , ') to be transmitted to the ears.
- Regularization methods allow controlling the norm of the approximate solution of an ill-conditioned linear system at the price of some loss in the accuracy of the solution.
- the control of the norm through regularization can be done subject to an optimization prescription, such as the minimization of a cost function.
- Regularization may be discussed analytically in the context of XTC filter optimization, which may be defined as the maximization of XTC performance for a desired tolerable level of spectral coloration or, equivalently, the minimization of spectral coloration for a desired minimum XTC performance.
- the envelope spectrum, 5 ⁇ ( ⁇ 3, is plotted in Fig. 3 for three values of ⁇ .
- Two features can be noted in that plot: 1 ) increasing the regularization parameter attenuates the peaks in the spectrum without affecting the minima, and 2) with increasing ⁇ the spectral maxima split into doublet peaks (two closely-spaced peaks).
- the first and second derivatives ⁇ are used to find the conditions for which the first derivative is nil and the second is negative. These conditions are summarized as follows: If ⁇ is below a threshold ⁇ " defined as
- the peaks are singlets and occur at the same non-dimensional frequencies as for the envelope spectrum peaks of the P-XTC filter (J l j ), and have the following amplitude:
- the method and system of the present invention rely on the use of a specific scheme for calculating the frequency-dependent regularization parameter (FDRP) that would result in the flattening of the amplitude vs frequency spectrum measured at the loudspeakers and not at the ears of the listeners as is implicit in previous XTC filter designs that are based on the inversion of the system transfer matrix.
- FDRP frequency-dependent regularization parameter
- a frequency-dependent regularization parameter is calculated that would cause the envelope spectrum 5(a ) ) to be flat at a desired level ⁇ (in dB) over the frequency bands where the perfect filter's envelope spectrum exceeds ⁇ . Outside these bands (i.e., where the S i P] (o)) is below ⁇ ), we apply no regularization. This can be stated symbolically as:
- step 30 the system's transfer matrix in the frequency domain (i.e. matrix C as in
- Eq. (12) and the input 28) is inverted, either analytically (if it results from a tractable idealized model) or numerically (if it results from experimental measurements), using zero or a very small constant regularization parameter (large enough to avoid machine inversion problems) to obtain the corresponding perfect XTC filter, H 1 '' 1 .
- Step 40 the FDRP thus obtained, ⁇ ( ⁇ ) , is used to calculate the pseudo-inverse of the system's transfer matrix (e.g. according to Eqn. (22)), which yields the sought regularized optimal XTC filter H t ?1 that has a flat frequency response at the loudspeakers.
- a time domain version (impulse response) of the filter is obtained in step 44 by simply taking the inverse Fourier transform of H [ ?1 (output 42) .
- Fig. 7 shows the four (windowed) measured impulse responses (IR) representing the transfer function in the time domain.
- the x-axis of each plot in Fig. 7 is time in ms, and the_y- axis is the normalized amplitude of the measured signal.
- the top left plot shows the IR of the left loudspeaker measured at the left ear of the dummy head, and the bottom left plot shows the IR of the left loudspeaker measured at the right ear of the dummy head.
- the top right plot is the ER. of the right speaker -left ear transfer function and the bottom plot is the IR of the right speaker - right ear transfer function.
- Fig 8 shows relevant spectra where the x-axis is frequency in Hz and the _y-axis is amplitude in dB.
- the curve 48 in that plot is the frequency response C LL that corresponds to the left speaker-left ear transfer function in the frequency domain obtained by panning the test sound completely to the left channel.
- the ripples in curve 48 above 5 kHz are due to the HRTF of the head and the left ear pinna.
- Curve 50 is the response at the left loudspeaker and shows a dynamic range loss of 31.45 dB (difference between the maximum and minimum in that curve).
- Curve 52 is the frequency response at the left (ipsilateral) ear, E SJ , which, as expected from a perfect XTC filter, is essentially flat over the entire audio band.
- the curve 54 is the corresponding frequency response measured at the right (contralateral) ear, E S( . , and shows significant attenuation with respect to curve 52 due to XTC.
- the difference in amplitude between the curves 52 and 54 linearly averaged over frequencies is the average XTC level, which for this case is 21.3 dB.
- the filter designed with the method of the present invention imposes no audible coloration to the sound of the playback system, has no dynamic range loss, and yields an XTC level that is essentially the same as that of a perfect XTC filter.
- the method described herein may be implemented in software, or firmware incorporated in a computer-readable storage medium for execution by a general purpose computer or a processor, such as a DSP chipset.
- suitable computer-readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
- Embodiments of the present invention may be represented as instructions and data stored in a computer-readable storage medium.
- aspects of the present invention may be implemented using Verilog, which is a hardware description language (HDL).
- Verilog data instructions may generate other intermediary data, (e.g., netlists, GDS data, or the like), that may be used to perform a manufacturing process implemented in a semiconductor fabrication facility.
- the manufacturing process may be adapted to manufacture semiconductor devices (e.g., processors) that embody various aspects of the present invention.
- Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, a graphics processing unit (GPU), a DSP core, a controller, a microcontroller, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) , any other type of integrated circuit (IC), and/or a state machine, or combinations thereof.
- DSP digital signal processor
- GPU graphics processing unit
- DSP core DSP core
- controller a microcontroller
- ASICs application specific integrated circuits
- FPGAs field programmable gate arrays
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Stereophonic System (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37989110P | 2010-09-03 | 2010-09-03 | |
PCT/US2011/050181 WO2012036912A1 (en) | 2010-09-03 | 2011-09-01 | Spectrally uncolored optimal croostalk cancellation for audio through loudspeakers |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2612437A1 true EP2612437A1 (en) | 2013-07-10 |
EP2612437A4 EP2612437A4 (en) | 2014-04-02 |
EP2612437B1 EP2612437B1 (en) | 2015-11-18 |
Family
ID=54290154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11825672.6A Active EP2612437B1 (en) | 2010-09-03 | 2011-09-01 | Spectrally uncolored optimal crosstalk cancellation for audio through loudspeakers |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2612437B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2556663A (en) * | 2016-10-05 | 2018-06-06 | Cirrus Logic Int Semiconductor Ltd | Method and apparatus for acoustic crosstalk cancellation |
US10595150B2 (en) | 2016-03-07 | 2020-03-17 | Cirrus Logic, Inc. | Method and apparatus for acoustic crosstalk cancellation |
CN112235691A (en) * | 2020-10-14 | 2021-01-15 | 南京南大电子智慧型服务机器人研究院有限公司 | Hybrid small-space sound reproduction quality improving method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6668061B1 (en) * | 1998-11-18 | 2003-12-23 | Jonathan S. Abel | Crosstalk canceler |
US20100202629A1 (en) * | 2007-07-05 | 2010-08-12 | Adaptive Audio Limited | Sound reproduction systems |
-
2011
- 2011-09-01 EP EP11825672.6A patent/EP2612437B1/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6668061B1 (en) * | 1998-11-18 | 2003-12-23 | Jonathan S. Abel | Crosstalk canceler |
US20100202629A1 (en) * | 2007-07-05 | 2010-08-12 | Adaptive Audio Limited | Sound reproduction systems |
Non-Patent Citations (3)
Title |
---|
BAI MINGSIAN R ET AL: "Optimal design of loudspeaker arrays for robust cross-talk cancellation using the Taguchi method and the genetic algorithm", THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, AMERICAN INSTITUTE OF PHYSICS FOR THE ACOUSTICAL SOCIETY OF AMERICA, NEW YORK, NY, US, vol. 117, no. 5, 1 May 2005 (2005-05-01), pages 2802-2813, XP012072930, ISSN: 0001-4966, DOI: 10.1121/1.1880852 * |
Edgar Y Choueiri: "Optimal Crosstalk Cancellation for Binaural Audio with Two Loudspeakers", , 13 November 2010 (2010-11-13), XP055103354, Princeton University Retrieved from the Internet: URL:http://www.princeton.edu/3D3A/Publications/BACCHPaperV4d.pdf [retrieved on 2014-02-20] * |
See also references of WO2012036912A1 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10595150B2 (en) | 2016-03-07 | 2020-03-17 | Cirrus Logic, Inc. | Method and apparatus for acoustic crosstalk cancellation |
US11115775B2 (en) | 2016-03-07 | 2021-09-07 | Cirrus Logic, Inc. | Method and apparatus for acoustic crosstalk cancellation |
GB2556663A (en) * | 2016-10-05 | 2018-06-06 | Cirrus Logic Int Semiconductor Ltd | Method and apparatus for acoustic crosstalk cancellation |
US10111001B2 (en) | 2016-10-05 | 2018-10-23 | Cirrus Logic, Inc. | Method and apparatus for acoustic crosstalk cancellation |
CN112235691A (en) * | 2020-10-14 | 2021-01-15 | 南京南大电子智慧型服务机器人研究院有限公司 | Hybrid small-space sound reproduction quality improving method |
Also Published As
Publication number | Publication date |
---|---|
EP2612437B1 (en) | 2015-11-18 |
EP2612437A4 (en) | 2014-04-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2012036912A1 (en) | Spectrally uncolored optimal croostalk cancellation for audio through loudspeakers | |
US10104485B2 (en) | Headphone response measurement and equalization | |
US8965546B2 (en) | Systems, methods, and apparatus for enhanced acoustic imaging | |
US9577595B2 (en) | Sound processing apparatus, sound processing method, and program | |
CN110024419B (en) | Gain Phase Equalization (GPEQ) filter and tuning method | |
US20140334650A1 (en) | Methods and devices for reproducing surround audio signals | |
CN110035376A (en) | Come the acoustic signal processing method and device of ears rendering using phase response feature | |
CN110557710B (en) | Low complexity multi-channel intelligent loudspeaker with voice control | |
TWI646530B (en) | Method for generating first sound and second sound, audio processing system, and non-transitory computer readable medium | |
WO2004103025A1 (en) | Loudspeaker system for virtual sound synthesis | |
CN107039029B (en) | Sound reproduction with active noise control in a helmet | |
US8873762B2 (en) | System and method for efficient sound production using directional enhancement | |
TW202027517A (en) | Spectral defect compensation for crosstalk processing of spatial audio signals | |
EP2612437A1 (en) | Spectrally uncolored optimal croostalk cancellation for audio through loudspeakers | |
Choueiri | Binaural audio through loudspeakers | |
WO2023010691A1 (en) | Earphone virtual space sound playback method and apparatus, storage medium, and earphones | |
JP2011259299A (en) | Head-related transfer function generation device, head-related transfer function generation method, and audio signal processing device | |
Cecchi et al. | Crossover Networks: A Review | |
EP4231668A1 (en) | Apparatus and method for head-related transfer function compression | |
Schultz et al. | An extraaural headphone for optimized binaural reproduction (Ein extraauraler Kopfhörer für die optimierte Wie-dergabe binauraler Signale) | |
KR20240145040A (en) | Device and method for head transfer function compression | |
WO2023156274A1 (en) | Apparatus and method for reducing spectral distortion in a system for reproducing virtual acoustics via loudspeakers | |
CN116389972A (en) | Audio signal processing method, system, chip and electronic equipment |
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 |
|
17P | Request for examination filed |
Effective date: 20130329 |
|
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 |
|
DAX | Request for extension of the european patent (deleted) | ||
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R079 Ref document number: 602011021507 Country of ref document: DE Free format text: PREVIOUS MAIN CLASS: H03B0029000000 Ipc: H04S0001000000 |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20140304 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: H04S 1/00 20060101AFI20140226BHEP |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20150508 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: CHOUEIRI, EDGAR, Y. |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
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 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 762069 Country of ref document: AT Kind code of ref document: T Effective date: 20151215 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602011021507 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: JACOBACCI AND PARTNERS S.P.A., CH |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: FP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 762069 Country of ref document: AT Kind code of ref document: T Effective date: 20151118 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20160218 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: 20151118 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: 20151118 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: 20151118 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: 20160318 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20160318 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: 20151118 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: 20151118 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: 20151118 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: 20151118 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: 20151118 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: 20160219 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: 20151118 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20151118 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602011021507 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20151118 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: 20151118 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: 20151118 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: 20151118 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: 20151118 |
|
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 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 6 |
|
26N | No opposition filed |
Effective date: 20160819 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20151118 |
|
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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20151118 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20151118 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
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: 20160901 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160901 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 7 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20151118 Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20110901 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160930 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: 20151118 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: 20151118 |
|
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: 20151118 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 8 |
|
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: 20151118 |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230524 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20230810 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20231001 Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20240705 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20240702 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20240701 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20240702 Year of fee payment: 14 |