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公开(公告)号：US10979812B2
公开(公告)日：2021-04-13
申请号：US16954123
申请日：2018-12-07
Applicant: GN Audio A/S , Mads Dyrholm , Allan Mejlgren Von Bülow
Inventor： Mads Dyrholm , Allan Mejlgren Von Bulow
IPC: H04R25/00 , H04R5/033 , G10L21/0232 , H04R1/10 , G10L21/0216
Abstract: A headset adapted to transmitting an outgoing audio signal (Tx) and comprising a voice microphone and at least one ambient microphone. The headset comprises an ambient noise reduction block (ANR), which is adapted to reduce the level of ambient noise in the outgoing audio signal (Tx). The ambient noise reduction block (ANR) includes the measuring the levels of the voice microphone signal (X) and ambient microphone signal (Y) to estimate a characteristic constant level drop between the voice microphone signal (X) and the ambient microphone signal (Y), which is characteristic for the headset user talking. A time-varying filter passes the voice microphone signal (X), when the level difference is larger than characteristic constant level drop (CLD) and attenuates the voice microphone signal (X), if the level difference is below characteristic constant level drop.
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公开(公告)号：US10904659B2
公开(公告)日：2021-01-26
申请号：US16710947
申请日：2019-12-11
Applicant: GN Audio A/S
Inventor： Mads Dyrholm
Abstract: The present invention relates to a microphone apparatus (30) with a main beamformer (31) that provides a main output audio signal (SM) as a beamformed signal by applying a main weight vector (BM) to a main input vector (MM). A main beamformer controller (32) repeatedly determines a main steering vector (dM) and adaptively determines the main weight vector (BM) in dependence on the main steering vector (dM) and the main input vector (MM) to increase the relative amount of voice sound (V) from the user (6) in the main output audio signal (SM).
The microphone apparatus (30) further comprises an auxiliary beamformer (33) that provides an auxiliary beamformer signal (SF) as a beamformed signal by applying an auxiliary weight vector (BF) to an auxiliary input vector (MA) that is a subset of the main input vector (MM), and an auxiliary beamformer controller (34) that adaptively determines the auxiliary weight vector (BF) to increase the relative amount of voice sound (V) from the user (6) in the auxiliary beamformer signal (SF). The main beamformer controller (32) determines the main steering vector (dM) in dependence on the auxiliary weight vector (BF).
This may enable the main beamformer controller (32) to utilize information derived independently of the steering vector (dM) and may thus improve stability and/or accuracy of the estimation of the steering vector (dM), and may further reduce the computation load for the main beamformer controller (32).-
Patent Agency Ranking
公开(公告)号：US20190208316A1
公开(公告)日：2019-07-04
申请号：US16202313
申请日：2018-11-28
Applicant: GN Audio A/S
Inventor： Mads Dyrholm
CPC classification number: H04R3/005 , G10L21/0232 , G10L25/78 , G10L2021/02166 , H04R2201/107 , H04R2410/05 , H04R2430/20
Abstract: The present invention relates to a microphone apparatus (10) with a main beamformer (F, BF) that provides a directional audio output (SF) by combining microphone signals (X, Y) from multiple microphones (11, 12).The quality of beamformed microphone signals normally depends on the individual microphones having equal sensitivity characteristics across the used frequency range. The invention enables automatic adaptation of the main beamformer (F, BF) to variations in microphone sensitivity and to changes in the alignment of the microphone apparatus (10) with respect to the user's mouth (7).This is achieved by having the microphone apparatus (10): estimate a suppression filter (Z) for an optimum voice-suppression beamformer (Z, BZ) based on the microphone signals (X, Y); estimate a candidate filter (W) for a candidate beamformer (W, BW) as the complex conjugate of the suppression filter (Z); estimate the performance of the candidate beamformer (W, BW); and replace a main filter (F) in the main beamformer (F, BF) with the candidate filter (W) if the candidate beamformer (W, BW) is estimated to perform better than the current main beamformer (F, BF).The invention may be used to enhance speech quality and intelligibility in headsets 1 and other audio devices that pick up user voice.
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公开(公告)号：US10341766B1
公开(公告)日：2019-07-02
申请号：US16202313
申请日：2018-11-28
Applicant: GN Audio A/S
Inventor： Mads Dyrholm
CPC classification number: H04R3/005 , G10L21/0232 , G10L25/78 , G10L2021/02166 , H04R2201/107 , H04R2410/05 , H04R2430/20
Abstract: The present invention relates to a microphone apparatus (10) with a main beamformer (F, BF) that provides a directional audio output (SF) by combining microphone signals (X, Y) from multiple microphones (11, 12).The quality of beamformed microphone signals normally depends on the individual microphones having equal sensitivity characteristics across the used frequency range. The invention enables automatic adaptation of the main beamformer (F, BF) to variations in microphone sensitivity and to changes in the alignment of the microphone apparatus (10) with respect to the user's mouth (7).This is achieved by having the microphone apparatus (10): estimate a suppression filter (Z) for an optimum voice-suppression beamformer (Z, BZ) based on the microphone signals (X, Y); estimate a candidate filter (W) for a candidate beamformer (W, BW) as the complex conjugate of the suppression filter (Z); estimate the performance of the candidate beamformer (W, BW); and replace a main filter (F) in the main beamformer (F, BF) with the candidate filter (W) if the candidate beamformer (W, BW) is estimated to perform better than the current main beamformer (F, BF).The invention may be used to enhance speech quality and intelligibility in headsets 1 and other audio devices that pick up user voice.
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公开(公告)号：US09906633B2
公开(公告)日：2018-02-27
申请号：US15290015
申请日：2016-10-11
Applicant: GN Audio A/S
Inventor： Martin Rung , Mads Dyrholm
Abstract: The present invention relates to a desktop speakerphone constructed to make the desktop speakerphone less space-consuming while having improved audio qualities. The desktop speakerphone preferably has two microphone clusters 6, 7 mounted at the upper side of the housing 2 closer towards respective longitudinal ends 8 of the latter, so that each microphone cluster 6, 7 can receive voice sound Av from one or more of the users. Each microphone cluster 6, 7 preferably comprises three pressure microphones 10, 11, 12. Furthermore, within each microphone cluster 6, 7, the second and third sound inlets 14, 15 are preferably arranged symmetrically on opposite sides of the respective median plane 18. Within each microphone cluster 6, 7, the relative arrangement of the three sound inlets 13, 14, 15 defines a respective microphone axis 9, 19 for each of the microphone pairs 10, 11, 10, 12. The microphone axis 9 of the first microphone pair 10, 11 extends through the first and the second sound inlet 13, 14, while the microphone axis 19 of the second microphone pair 10, 12 extends through the first and the third sound inlet 13, 15. The microphones are connected to multiple array processors, each configured to provide an array signal in dependence on two or more of the multiple microphone signals. First and second array processor configured to provide array signals in dependence on microphone signals.
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公开(公告)号：US20200213726A1
公开(公告)日：2020-07-02
申请号：US16710947
申请日：2019-12-11
Applicant: GN Audio A/S
Inventor： Mads Dyrholm
Abstract: The present invention relates to a microphone apparatus (30) with a main beamformer (31) that provides a main output audio signal (SM) as a beamformed signal by applying a main weight vector (BM) to a main input vector (MM). A main beamformer controller (32) repeatedly determines a main steering vector (dM) and adaptively determines the main weight vector (BM) in dependence on the main steering vector (dM) and the main input vector (MM) to increase the relative amount of voice sound (V) from the user (6) in the main output audio signal (SM).The microphone apparatus (30) further comprises an auxiliary beamformer (33) that provides an auxiliary beamformer signal (SF) as a beamformed signal by applying an auxiliary weight vector (BF) to an auxiliary input vector (MA) that is a subset of the main input vector (MM), and an auxiliary beamformer controller (34) that adaptively determines the auxiliary weight vector (BF) to increase the relative amount of voice sound (V) from the user (6) in the auxiliary beamformer signal (SF). The main beamformer controller (32) determines the main steering vector (dM) in dependence on the auxiliary weight vector (BF).This may enable the main beamformer controller (32) to utilize information derived independently of the steering vector (dM) and may thus improve stability and/or accuracy of the estimation of the steering vector (dM), and may further reduce the computation load for the main beamformer controller (32).
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公开(公告)号：US20170187854A1
公开(公告)日：2017-06-29
申请号：US15290015
申请日：2016-10-11
Applicant: GN Audio A/S
Inventor： Martin Rung , Mads Dyrholm
Abstract: The present invention relates to a desktop speakerphone constructed to make the desktop speakerphone less space-consuming while having improved audio qualities. The desktop speakerphone preferably has two microphone clusters 6, 7 mounted at the upper side of the housing 2 closer towards respective longitudinal ends 8 of the latter, so that each microphone cluster 6, 7 can receive voice sound Av from one or more of the users. Each microphone cluster 6, 7 preferably comprises three pressure microphones 10, 11, 12. Furthermore, within each microphone cluster 6, 7, the second and third sound inlets 14, 15 are preferably arranged symmetrically on opposite sides of the respective median plane 18. Within each microphone cluster 6, 7, the relative arrangement of the three sound inlets 13, 14, 15 defines a respective microphone axis 9, 19 for each of the microphone pairs 10, 11, 10, 12. The microphone axis 9 of the first microphone pair 10, 11 extends through the first and the second sound inlet 13, 14, while the microphone axis 19 of the second microphone pair 10, 12 extends through the first and the third sound inlet 13, 15. The microphones are connected to multiple array processors, each configured to provide an array signal in dependence on two or more of the multiple microphone signals. First and second array processor configured to provide array signals in dependence on microphone signals.
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