WO2018042773A1 - Dispositif de capture de son, support d'enregistrement et procédé - Google Patents

Dispositif de capture de son, support d'enregistrement et procédé Download PDF

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Publication number
WO2018042773A1
WO2018042773A1 PCT/JP2017/018871 JP2017018871W WO2018042773A1 WO 2018042773 A1 WO2018042773 A1 WO 2018042773A1 JP 2017018871 W JP2017018871 W JP 2017018871W WO 2018042773 A1 WO2018042773 A1 WO 2018042773A1
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Prior art keywords
target area
area sound
sound
output
directivity
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PCT/JP2017/018871
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English (en)
Japanese (ja)
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一浩 片桐
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沖電気工業株式会社
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L21/0232—Processing in the frequency domain
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • 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

Definitions

  • the present invention relates to a sound collection device, a recording medium, and a method, and can be applied to, for example, a device that emphasizes sounds in a specific area and suppresses sounds in other areas.
  • BF beam former
  • a microphone array As a technique for separating and collecting only sound in a specific direction in an environment where a plurality of sound sources exist.
  • BF is a technique for forming directivity using the time difference between signals reaching each microphone (see Non-Patent Document 1).
  • BF is roughly divided into two types, an addition type and a subtraction type.
  • the subtraction type BF has an advantage that directivity can be formed with a smaller number of microphones than the addition type BF.
  • FIG. 7 is a block diagram showing a configuration related to a conventional subtraction type BF.
  • the number of microphones is two.
  • the conventional subtractive BF first calculates the time difference between signals arriving at each microphone by sounds that are present in a target direction (hereinafter also referred to as “target sound”) by a delay device, and adds a delay to the target sound. Match the phase.
  • target sound a target direction
  • the time difference is calculated by the following equation (1).
  • d is the distance between the microphones
  • c is the speed of sound
  • ⁇ i is the delay amount.
  • the delay unit in the conventional subtractive BF has the input signal x 1 ( Delay processing is performed for t). Thereafter, the input signal x 1 (t) subjected to the delay process is subjected to a subtraction process according to the equation (2).
  • m 1 (t) x 2 (t) ⁇ x 1 (t ⁇ L ) (2)
  • the subtraction process in the conventional subtraction type BF can be similarly performed in the frequency domain, and in this case, the expression (2) is changed to the following expression (3).
  • the formed directivity is cardioid unidirectional as shown in FIG. 8A
  • ⁇ L 0, ⁇
  • the directivity is as shown in FIG. 8B.
  • Eight-shaped bi-directionality a filter that forms unidirectionality from an input signal is referred to as a unidirectional filter
  • a filter that forms bidirectionality is referred to as a bidirectional filter.
  • SS spectral subtraction
  • non-target sound sound existing in a direction other than the target direction
  • a bi-directional filter sound existing in a direction other than the target direction
  • of the extracted non-target sound is determined as the amplitude spectrum of the input signal
  • for each frequency are calculated from the equations (5) and (6).
  • Re and Im represent a real part and an imaginary part, respectively, and k represents a frequency.
  • target area sound When it is desired to collect only sound (hereinafter referred to as “target area sound”) existing in a specific area (within the sound collection target area), the directivity of the conventional subtractive BF is linearly formed. Therefore, by directing the directivity in the direction of the target area, even if the sound source exists outside the target area (hereinafter referred to as “non-target area sound”), all the sound sources existing in the direction of the target area are collected. Resulting in.
  • Patent Document 1 a method (area sound collection) of collecting a target area sound by using a plurality of microphone arrays, directing directivity from different directions to the target area, and intersecting the directivity in the target area. is suggesting.
  • the power ratio of the target area sound included in the BF output of each microphone array is estimated and used as a correction coefficient.
  • the correction coefficient for the target area sound power is calculated by the equation (7) or (8).
  • each BF output is corrected by a correction coefficient, and non-target area sound existing in the target area direction is extracted by performing SS.
  • the target area sound can be extracted by performing SS extraction on the extracted non-target area sound from the output of each BF.
  • the non-target area sound is SS extracted from the BF output according to the equation (10), and the target area sound is extracted.
  • ⁇ 1 is a coefficient for changing the strength at the time of SS.
  • the sound collecting device includes (1) directivity forming means for forming directivity in the direction of a target area from an input signal by a beam former, and (2) directivity formed by the directivity forming means.
  • Non-target area sound extracting means for extracting non-target area sound existing in the direction of the target area; (3) the non-target area sound extracted by the non-target area sound extracting means and the output of the beamformer at the output of the beamformer.
  • a target area sound emphasizing means for inverting the phase of the non-target area sound using phase information and adding it to the output of the beam former.
  • the sound collection program included in the computer-readable recording medium on which the sound collection program is recorded has (1) directivity in the direction of the target area by the beamformer from the input signal.
  • Directivity forming means (2) non-target area sound extracting means for extracting non-target area sounds existing in the target area direction by directivity formed by the directivity forming means, and (3) non-target area sounds.
  • the phase information of the non-target area sound extracted by the extraction means and the input signal to the output of the beamformer the phase of the non-target area sound is inverted and added to the output of the beamformer. It is made to function as a means.
  • the sound collection method performed by the sound collection device includes (1) directivity formation means, non-target area sound extraction means, and target area sound enhancement means, and (2) the directivity formation.
  • the means forms directivity in the target area direction from the input signal by a beamformer.
  • the non-target area sound extraction means is non-existent in the target area direction by directivity formed by the directivity forming means.
  • a target area sound is extracted, and (4) the target area sound enhancement means uses the non-target area sound extracted by the non-target area sound extraction means and the phase information of the input signal at the output of the beamformer, Inverting the phase of the non-target area sound and adding it to the output of the beamformer.
  • FIG. 1 is a block diagram showing the functional configuration of the sound collection device 100 of this embodiment.
  • the sound collection device 100 uses two microphone arrays MA (MA1, MA2) to perform a target area sound collection process for collecting a target area sound from a sound source in the target area.
  • MA1, MA2 two microphone arrays
  • the microphone arrays MA1 and MA2 are arranged at any place in the air where the target area exists.
  • the positions of the microphone arrays MA1 and MA2 with respect to the target area may be anywhere as long as directivity overlaps only in the target area.
  • Each microphone array MA is composed of two or more microphones M, and an acoustic signal is collected by each microphone M.
  • description will be made assuming that two microphones M (M1, M2) that collect sound signals are arranged in each microphone array MA. That is, each microphone array MA constitutes a 2ch microphone array.
  • the number of microphone arrays MA is not limited to two. When there are a plurality of target areas, it is necessary to arrange a number of microphone arrays MA that can cover all areas. In this embodiment system, a directional microphone such as a shotgun microphone may be used instead of the microphone array.
  • the sound collection device 100 includes a signal input unit 1, a directivity forming unit 2, a delay correction unit 3, a spatial coordinate data 4, a target area sound power correction coefficient calculation unit 5, a non-target area sound extraction unit 6, and a target area sound enhancement unit. 7. Detailed processing of each functional block constituting the sound collection device 100 will be described later.
  • the sound collection device 100 may be configured entirely by hardware (for example, a dedicated chip), or may be configured partially or entirely as software (program).
  • the sound collection device 100 may be configured by installing a program (including the sound collection program of the embodiment) in a computer having a processor and a memory.
  • the signal input unit 1 converts the acoustic signals collected by the microphone arrays MA1 and MA2 from analog signals to digital signals. And the signal input part 1 performs the conversion process (For example, the process which converts from a time domain to a frequency domain using a fast Fourier transform etc.) about the said digital signal.
  • the directivity forming unit 2 extracts, for each microphone array MA, a non-target area sound that exists in a direction other than the target direction (for example, by a bi-directional filter), and extracts the amplitude spectrum of the extracted non-target area sound of the input signal. By subtracting from the amplitude spectrum, a sound having a directivity in the direction of the target area (BF output) is acquired. Specifically, the directivity forming unit 2 outputs a sound in which directivity is formed in the target area direction by BF according to the equation (4) with respect to the signal in which the background noise is suppressed by the noise suppressing unit 8 for each microphone array MA. Get as output.
  • the processing of the directivity forming unit 2 is omitted and the input signal is supplied as it is to the subsequent stage side. Also good.
  • the delay correction unit 3 calculates and corrects the delay caused by the difference in distance between the target area and each microphone array. First, the position of the target area and the position of the microphone array are acquired from the spatial coordinate data 4, and the difference in the arrival time of the target area sound to each microphone array is calculated. Next, with reference to the microphone array arranged farthest from the target area, a delay is added so that the target area sound reaches all the microphone arrays simultaneously.
  • Spatial coordinate data 4 holds the position information of all target areas, each microphone array, and the microphones constituting each microphone array.
  • the target area sound power correction coefficient calculation unit 5 calculates a correction coefficient for making the power of the target area sound component included in each BF output the same in accordance with the above formula (7) or (8).
  • the non-target area sound extraction unit 6 SS each BF output data corrected by the correction coefficient calculated by the target area sound power correction coefficient calculation unit 5 in accordance with the following equation (9), and the non-target area existing in the target area direction Extract sound.
  • the target area sound enhancement unit 7 does not perform SS at the time of extraction of the target area sound that may cause musical noise, suppresses the non-target area sound using the phase information, and emphasizes the target area sound.
  • the phase information of the input signal can be obtained by dividing the real part and imaginary part of the input signal subjected to the discrete Fourier transform by the amplitude spectrum of the input signal.
  • the target area sound emphasizing unit 7 can give the same phase as the input signal by multiplying the phase information by the amplitude spectrum of the non-target area sound and the BF output.
  • the phase information of the input signal originally includes the phase of the target sound in BF. Since the BF output includes the target area sound and the non-target area sound, if the phase information of the input signal is added to the BF output, the phase of the target area sound and the non-target area sound in the BF output can be restored. Can do.
  • the target area sound emphasizing unit 7 can also restore the phase of the non-target area sound extracted in the same manner. Therefore, in the target area sound enhancement unit 7, if the phase of the extracted non-target area sound is reversed and added to the BF output, the non-target area sound component in the BF output becomes the extracted non-target area sound component. And oppressed each other. As a result, the target area sound enhancement unit 7 can emphasize only the target area sound during BF output.
  • the target area sound emphasizing unit 7 adds phase information of the input signal thereto. To do. Since the BF output is also an amplitude spectrum, the target area sound enhancement unit 7 similarly provides phase information of the input signal.
  • the target area sound emphasizing unit 7 gives phase information of the input signal to the extracted non-target area sound
  • the target area sound emphasizing unit 7 also gives phase information of the input signal to the BF output
  • the target area sound emphasizing unit 7 then reverses the phase of the non-target area sound in accordance with the equation (13) in the entire band or the limited band, and adds the BF output to suppress the non-target area sound component in the BF output. Emphasize the target area sound.
  • ⁇ 1 is a coefficient for controlling the amplitude of the non-target area sound.
  • the suppression of the non-target area sound may be performed in the frequency domain, or may be performed after returning to the time domain by inverse Fourier transform.
  • the non-target area sound component in the BF output is suppressed without performing SS at the time of extracting the target area sound that may cause the generation of musical noise in suppressing the non-target area sound.
  • the target area sound is emphasized by canceling the extracted non-target area sound with an opposite phase.
  • the sound collection device 100 of the first embodiment has the effects of reducing the occurrence of musical noise and reducing the distortion of the target area sound by suppressing it. Since the process of canceling the non-target area sound with the opposite phase is not a non-linear process like SS but a linear process, generation of musical noise like SS can be suppressed.
  • the graphs of FIGS. 3A, 3B, 4A, and 4B are shown for an experiment (hereinafter referred to as “the present experiment”) that the applicant actually constructed the sound collection device 100 of the first embodiment. It explains using.
  • FIG. 3A and 3B are graphs showing the spectrum of the signal processed by the target area sound enhancement unit 7 in this experiment. Specifically, FIG. 3A is a graph showing the spectrum of the BF output supplied to the target area sound enhancement unit 7 in this experiment. FIG. 3B is a graph showing the spectrum of the target area sound included in the BF output shown in FIG. 3A.
  • 4A and 4B are graphs showing the performance when the target area sound is emphasized by suppressing the non-target area sound by using the sound collecting device 100 (target area sound emphasizing unit 7) of this embodiment. .
  • FIG. 4A is a graph showing a spectrum of a signal in which the non-target area sound is suppressed from the BF output shown in FIG. 3A and the target area sound is emphasized by conventional spectral subtraction (SS).
  • SS spectral subtraction
  • FIG. 4B is a graph showing a spectrum of a signal in which the target area sound is emphasized by suppressing the non-target area sound from the BF output shown in FIG. That is, the spectrum shown in FIG. 4B shows the result of canceling out the non-target area sound in the opposite phase from the BF output shown in FIG. 3A.
  • FIG. 5 is a block diagram showing a functional configuration of the sound collection device 100A of this embodiment.
  • the same or corresponding parts as those in FIG. 5 are identical or corresponding parts as those in FIG. 5
  • the sound collection device 100A is different from the first embodiment in that the target area sound enhancement unit 7 is replaced with the target area sound enhancement unit 7A and a noise suppression unit 8 is added.
  • the noise suppression unit 8 performs a process of estimating and suppressing the background noise component included in the signal acquired by the signal input unit 1. In addition, the noise suppression unit 8 supplies the pressure background noise level to the target area sound enhancement unit 7A.
  • Destination area sound enhancement unit 7A based on the value of the amplitude spectrum of the level and non-target areas sound of the background noise, performs a process of updating the mu 1 in the above equation (13).
  • the noise suppression unit 8 estimates a background noise component included in the signal acquired by the signal input unit 1 and supplies the signal after noise suppression to the directivity forming unit 2.
  • the noise suppressing unit 8 for example, SS or Wiener filtering can be used for noise suppression.
  • the target area sound enhancement unit 7A calculates ⁇ 1 in the above equation (13) from the level of the background noise estimated by the noise suppression unit 8 and the amplitude spectrum value of the non-target area sound extracted by the non-target area sound extraction unit 6. Update.
  • the target area sound enhancement unit 7A sets the value of ⁇ 1 in proportion to the background noise level estimated by the noise suppression unit 8. It is desirable to enlarge it.
  • the object area sound enhancement unit 7A regarded as not present purpose area sound, set the mu 1 Initial value (advance given It is also possible to return to the initial value.
  • the noise suppression unit 8 by adding the noise suppression unit 8, the background area noise of the input signal is suppressed and the target area sound is emphasized. Will be.
  • the value of ⁇ 1 (a coefficient for controlling the amplitude of the non-target area sound) is set in proportion to the background noise level estimated by the noise suppression unit 8. It is getting bigger. Thereby, in the sound collection device 100A of the second embodiment, even when the background noise is large and the background noise cannot be completely suppressed by the noise suppression unit 8, the non-target area sound is sufficiently suppressed (the target area sound is reduced). it is possible to set the coefficient mu 1 to emphasize).
  • FIG. 6 is a block diagram showing a functional configuration of the sound collection device 100B of this embodiment.
  • the same or corresponding parts as those in FIG. 6 are identical or corresponding parts as those in FIG.
  • the sound collection device 100B is different from the second embodiment in that the target area sound enhancement unit 7A is replaced with the target area sound enhancement unit 7B.
  • the target area sound emphasizing unit 7B emphasizes the target area sound by switching between suppression of the non-target area sound by the phase and suppression of the non-target area sound by the SS depending on the situation.
  • the target area sound enhancement unit 7B includes a non-target area sound phase suppression unit 7-1 that performs non-target area sound suppression processing based on phase, and a non-target area sound spectrum subtraction unit 7 that performs non-target area sound suppression processing based on SS. -2, and switching to either one of them suppresses the non-target area sound (emphasis of the target area sound).
  • the target area sound emphasizing unit 7B is based on the background noise level estimated by the noise suppressing unit 8 and the amplitude spectrum value of the non-target area sound extracted by the non-target area sound extracting unit 6. 1 and non-target area sound spectrum subtraction unit 7-2 are switched to suppress non-target area sound.
  • the non-target area sound phase suppressing unit 7-1 suppresses the non-target area sound according to the above equation (13), and the non-target area sound spectrum subtracting unit 7-2 according to the above equation (10). To suppress.
  • the switching conditions for these processes are not limited.
  • the target area sound emphasizing unit 7B does not satisfy the condition that “the level of the background noise is smaller than the threshold value ⁇ 2 ”and“ the amplitude spectrum of the non-target area sound is smaller than the threshold value ⁇ 3 ”.
  • the non-target area sound is suppressed by the target area sound spectrum subtracting unit 7-2, and the non-target area sound suppression process is performed by the non-target area sound phase suppressing unit 7-1 when the above condition is not satisfied. Also good.
  • the relationship between the thresholds ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 1 and ⁇ 3 of the amplitude spectrum of the non-target area sound when ⁇ 1 is set is ⁇ 1 ⁇ 3 .
  • the non-target area sound is based on the background noise level estimated by the noise suppression unit 8 and the amplitude spectrum value of the non-target area sound extracted by the non-target area sound extraction unit 6.
  • An appropriate method (a method capable of performing higher quality processing) is selected from the phase suppressing unit 7-1 and the non-target area sound spectrum subtracting unit 7-2 to suppress non-target area sound (target area). Applied to sound enhancement).
  • the non-target area sound phase suppression unit 7-1 when the volume level of background noise or non-target area sound is high, the non-target area sound phase suppression unit 7-1 is applied to reduce noise. The occurrence of musical noise and the suppression of the target area sound due to leftovers are reduced. Further, in the sound collection device 100B of the third embodiment, the non-target area sound subtraction unit 7-2 is applied when the background noise level or the volume level of the non-target area sound is low, thereby accurately providing the non-target area sound. Can be suppressed. In addition, when the volume level of background noise or non-target area sound is low, it is possible to reduce the occurrence of musical noise and the suppression of target area sound even if the target area sound suppression processing by SS is performed. In addition, the non-target area sound can be suppressed with higher accuracy than the processing by the non-target area sound phase suppressing unit 7-1.
  • the noise suppression unit 8 estimates the background noise component included in the signal acquired by the signal input unit 1 and only acquires the background noise level. You may make it replace with the means (henceforth "estimating means") supplied to the target area sound emphasis part 7.
  • FIG. similarly to the first embodiment, the signal output from the signal input unit 1 is supplied to the directivity forming unit 2 as it is.
  • the noise suppression unit 8 estimates the background noise component included in the signal acquired by the signal input unit 1 and only acquires the background noise level, and performs the target area sound. You may make it replace with the estimation means supplied to the emphasis part 7. FIG.
  • the target area sound enhancement unit 7B performs the processing of the non-target area sound phase suppression unit 7-1 and the non-target area sound spectrum subtraction unit 7-2 at the same time, May be mixed to obtain the final output.
  • the target area sound enhancement unit 7B considers the background noise level and the amplitude spectrum of the non-target area sound, and suppresses the non-target area sound suppression method (non-target area sound phase).
  • the suppression unit 7-1 or the non-target area sound spectrum subtraction unit 7-2) is selected, but only one of the background noise level or the non-target area sound amplitude spectrum is used to suppress the non-target area sound.
  • a method may be selected.
  • the object area sound enhancement unit 7B when the level of background noise is less than the threshold T 2, and select the non-target area sound spectrum subtraction unit 7-2, the non-target area sound phase suppressor otherwise 7 -1 may be selected.
  • the object area sound enhancement unit 7B when the amplitude spectra of the non-target area sound is smaller than the threshold value T 3, select the non-target area sound spectrum subtraction unit 7-2, the non-target area sound phase otherwise The suppression unit 7-1 may be selected.
  • At least a part of the programs according to the above-described embodiments can be configured by software as an information processing program for causing a computer to function. When configured by software, at least a part of these methods is performed.
  • the program to be realized is stored in a recording medium such as a flexible disk or a CD-ROM (Compact Disc Only Memory), and is read and executed by the sound collecting device 100 or other devices connected to the sound collecting device 100. May be.
  • the recording medium is not limited to a removable medium such as a magnetic disk or an optical disk, but may be a fixed recording medium such as a hard disk device or a memory.
  • a program that realizes at least a part of the method according to the embodiment may be distributed via a communication line (including wireless communication) such as the Internet. Further, the program may be distributed in a state where the program is encrypted, modulated or compressed, and stored in a recording medium via a wired line such as the Internet or a wireless line.
  • SYMBOLS 100, 100A, 100B ... Sound collecting device, 1 ... Signal input part, 2 ... Directionality formation part, 3 ... Delay correction part, 4 ... Spatial coordinate data, 5 ... Target area sound power correction coefficient calculation part, 6 ... Target area Sound extraction unit, 7, 7A, 7B... Target area sound enhancement unit, 7-1 non-target area sound phase suppression unit, 7-2 non-target area sound spectrum subtraction unit.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computational Linguistics (AREA)
  • Otolaryngology (AREA)
  • Quality & Reliability (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

Le problème décrit par la présente invention est de supprimer le bruit musical et analogue lorsque la capture de son de zone est réalisée. La solution selon invention porte sur un dispositif de capture de son. Ce dispositif de capture de son est caractérisé en ce qu'il comprend : un moyen de formation de directivité permettant de former une directivité dans une direction de zone cible à partir d'un signal d'entrée à l'aide d'un dispositif de formation de faisceau ; un moyen d'extraction de son de zone non-cible permettant d'extraire un son de zone non-cible présent dans la direction de zone cible de la directivité formée par le moyen de formation de directivité ; et un moyen d'amélioration de son de zone cible qui inverse la phase du son de zone non-cible en appliquant des informations de phase du signal d'entrée au son de zone non-cible extrait par le moyen d'extraction de son de zone non-cible et une sortie du formateur de faisceau, et qui ajoute le son de zone non-cible inversée en phase à la sortie du formateur de faisceau.
PCT/JP2017/018871 2016-08-31 2017-05-19 Dispositif de capture de son, support d'enregistrement et procédé WO2018042773A1 (fr)

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