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    AMBIENT NOISE REDUCTION
    1.
    发明申请
    AMBIENT NOISE REDUCTION 审中-公开
    减少噪音

    公开(公告)号：WO2008090342A3

    公开(公告)日：2008-10-30

    申请号：PCT/GB2008000237

    申请日：2008-01-23

    Applicant: WOLFSON MICROELECTRONICS PLC ,  SIBBALD ALASTAIR ,  HOWLE MARTIN

    Inventor： SIBBALD ALASTAIR ,  HOWLE MARTIN

    IPC: H04R3/00 ,  G10K11/178

    CPC classification number: H04R3/00 ,  G10K11/178 ,  G10K2210/1081 ,  H04R1/1083

    Abstract: The invention provides improved ambient noise reduction for ear-worn devices, such as earphones and headphones and for other devices worn upon or used in close proximity to the ear, such as cellular telephone handsets, and it provides, in particular, improvements to "feed-forward" ambient noise-reduction systems. Most feed-forward noise-reduction systems available hitherto purport to operate only below about 1 kHz and, even then, provide only relatively modest amounts of noise reduction. In accordance with this invention, predetermined filter parameters, such as the gain and cut-off frequency of a selected filter stage used in the noise-reduction processing, are mathematically modelled and the model is adjusted in real-time, in response to user-interpretation of a graphical display of a predicted residual noise amplitude spectrum. This allows the user to inspect the predicted residual noise level amplitude spectrum and to iteratively adjust the filter parameters to minimise residual noise in a chosen environment. Instead of being made manually by a user, the iterative adjustments may be automated and implemented under computer control, using known data-fitting methods and/or neural networks.

    Abstract translation: 本发明为诸如耳机和头戴式耳机之类的耳戴式设备以及佩戴在耳朵上或靠近耳朵使用的其他设备（诸如蜂窝式电话手持设备）提供了改善的环境噪声降低，并且特别地提供了对“馈送 前向“环境降噪系统。 迄今为止，大多数可用的前馈降噪系统只能在约1kHz以下工作，即使这样，也只能提供相对适中的降噪量。 根据本发明，响应于用户定义的参数，在数学上建模预定的滤波器参数（例如在降噪处理中使用的选定滤波器级的增益和截止频率）并且实时调节模型， 解释预测的残余噪声振幅谱的图形显示。 这允许用户检查预测的残余噪声电平幅度谱并且迭代地调整滤波器参数以最小化所选环境中的残余噪声。 使用已知的数据拟合方法和/或神经网络，代替由用户手动进行，迭代调整可以被自动化并且在计算机控制下实现。

    Ear simulator
    4.
    发明专利
    Ear simulator 未知

    公开(公告)号：GB2456846A

    公开(公告)日：2009-07-29

    申请号：GB0814048

    申请日：2008-07-31

    Applicant: WOLFSON MICROELECTRONICS PLC

    Inventor： HOWLE MARTIN ,  SIBBALD ALASTAIR

    IPC: H04R29/00 ,  G01H15/00

    Abstract: An ear simulator for telephonometry has an inlet port 62 for receiving sounds from a speaker 18 of a communications device such a mobile phone handset 12, and it has an outlet port 38 in an opposite surface. The ear simulator has at least one additional aperture 60 in the same surface 50 as the inlet port 62, representing acoustic leakage around a mobile phone held against a user's ear. This allows the ear simulator to provide measurement results that more accurately represent the frequency dependent phase response of the transfer function from the handset loudspeaker driver to the ear of a user of the handset. The additional apertures 60 are provided in a raised portion (58, fig 6) of the inlet port surface so as to provide a reference location (65, fig 7B) for the mobile phone handset. The inlet port surface 50 that carries the mobile phone handset may be rotated with respect to the remainder of the ear simulator (fig 10A, 10B).

    Feedforward ambient noise reduction
    5.
    发明专利
    Feedforward ambient noise reduction 未知

    公开(公告)号：GB2445984A

    公开(公告)日：2008-07-30

    申请号：GB0701483

    申请日：2007-01-25

    Applicant: SONAPTIC LTD ,  WOLFSON MICROELECTRONICS PLC

    Inventor： SIBBALD ALASTAIR ,  HOWLE MARTIN

    IPC: G10K11/178 ,  H04M1/19 ,  H04R3/00

    Abstract: Most feed-forward noise-reduction systems available hitherto purport to operate only below about 1 kHz and, even then, provide only relatively modest amounts of noise reduction. With this invention, predetermined filter parameters, such as the gain and cut-off frequency of a selected filter stage used in the noise-reduction processing, are mathematically modelled and the model is adjusted in real-time, in response to user-interpretation of a graphical display of a predicted residual noise amplitude spectrum. This allows the user to inspect the predicted residual noise amplitude spectrum and to iteratively adjust the filter parameters to minimise residual noise in a chosen environment. Instead of being made manually by a user, the iterative adjustments may be automated and implemented under computer control, using known data-fitting methods and/or neural networks. The invention provides improved feedforward ambient noise reduction for ear-worn devices, such as earphones, headphones and other devices worn upon or used in close proximity to the ear, such as cellular telephone handsets.

    Noise-cancelling ear-worn speaker-carrying devices with vents to bypass seals and cancel sound leakage
    7.
    发明专利
    Noise-cancelling ear-worn speaker-carrying devices with vents to bypass seals and cancel sound leakage 未知

    公开(公告)号：GB2446982A

    公开(公告)日：2008-08-27

    申请号：GB0809515

    申请日：2007-02-16

    Applicant: WOLFSON MICROELECTRONICS PLC

    Inventor： SIBBALD ALASTAIR ,  HOWLE MARTIN

    IPC: H04R1/10 ,  H04R5/033

    Abstract: An ear-worn speaker carrying device ("ESD") such as a headset or earphones incorporates feedforward active ambient noise reduction circuitry. A seal 36 contacts or surrounds the ear of a user and is intended to present a substantial impedance to inward or outward transmission of sound to or from the ear. At least one acoustic channel of predetermined dimensions bypasses the seal to providing an acoustic leakage path of known characteristics, thereby permitting predetermined levels of sound to enter and exit by way of the channel, such that minor variations in leakage, dependent, for example, upon precise mounting of the seal to the ear as used from time to time, are rendered relatively unimportant. The device further comprises an acoustic conduit connected to vent the speaker's rear surface to the external ambient, and respective exit apertures for the acoustic channel and the acoustic conduit are so relatively located that sounds exiting from them tend to cancel each other, reducing sound emissions from the device. Each of the channel and the conduit may be damped (fig.5).

    Ambient noise reduction
    9.
    发明专利
    Ambient noise reduction 未知

    公开(公告)号：GB2445984B

    公开(公告)日：2011-12-07

    申请号：GB0701483

    申请日：2007-01-25

    Applicant: SONAPTIC LTD ,  WOLFSON MICROELECTRONICS PLC

    Inventor： SIBBALD ALASTAIR ,  HOWLE MARTIN

    IPC: G10K11/178 ,  H04M1/19 ,  H04R3/00

    Abstract: The invention provides improved ambient noise reduction for ear-worn devices, such as earphones and headphones and for other devices worn upon or used in close proximity to the ear, such as cellular telephone handsets, and it provides, in particular, improvements to “feed-forward” ambient noise-reduction systems. Most feed-forward noise-reduction systems available hitherto purport to operate only below about 1 kHz and, even then, provide only relatively modest amounts of noise reduction. In accordance with this invention, predetermined filter parameters, such as the gain and cut-off frequency of a selected filter stage used in the noise-reduction processing, are mathematically modelled and the model is adjusted in real-time, in response to user-interpretation of a graphical display of a predicted residual noise amplitude spectrum. This allows the user to inspect the predicted residual noise level amplitude spectrum and to iteratively adjust the filter parameters to minimise residual noise in a chosen environment. Instead of being made manually by a user, the iterative adjustments may be automated and implemented under computer control, using known data-fitting methods and/or neural networks.

    Noise-cancelling ear-worn speaker-carrying devices with vents to bypass seals and cancel sound leakage
    10.
    发明专利
    Noise-cancelling ear-worn speaker-carrying devices with vents to bypass seals and cancel sound leakage 未知

    公开(公告)号：GB2454605A

    公开(公告)日：2009-05-13

    申请号：GB0901412

    申请日：2007-02-16

    Applicant: WOLFSON MICROELECTRONICS PLC

    Inventor： SIBBALD ALASTAIR ,  HOWLE MARTIN

    IPC: H04R1/10 ,  H04R1/28 ,  H04R5/033

    Abstract: An ear-worn speaker carrying device ("ESD") such as a headset or earphones incorporates feedforward active ambient noise reduction circuitry. A seal 36 contacts or surrounds the ear of a user and is intended to present a substantial impedance to inward or outward transmission of sound to or from the ear. At least one acoustic channel of predetermined dimensions bypasses the seal to providing an acoustic leakage path of known characteristics, thereby permitting predetermined levels of sound to enter and exit by way of the channel, such that minor variations in leakage, dependent, for example, upon precise mounting of the seal to the ear as used from time to time, are rendered relatively unimportant. The device further comprises an acoustic conduit connected to vent the speaker's rear surface to the external ambient, and respective exit apertures for the acoustic channel and the acoustic conduit are so relatively located that sounds exiting from them tend to cancel each other, reducing sound emissions from the device. Each of the channel and the conduit may be damped (see fig.5).

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