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1. 发明公开

EP2153435A1 COMMUNICATION APPARATUS WITH AMBIENT NOISE REDUCTION 有权转让
标题翻译：减少环境噪音TALK设备
公开(公告)号：EP2153435A1
公开(公告)日：2010-02-17
申请号：EP08750541.8
申请日：2008-05-08
申请人： Wolfson Microelectronics plc
发明人： SIBBALD, Alastair
IPC分类号： G10K11/178 , H04R3/00
CPC分类号： G10K11/16 , G10K11/178 , G10K2210/1081 , H04M1/6066 , H04M1/7253 , H04R1/1041 , H04R1/1083 , H04R5/033 , H04R2420/05 , H04R2499/11
摘要： Noise reduction circuitry for a communication apparatus can apply different noise reduction transfer functions, depending on whether a listening device is connected to the apparatus. If no listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form an integral part of the communication apparatus, which may be a cellular telephone. If a listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form a part of the listening device. This allows the noise reduction circuitry to provide improved noise reduction performance.

2. 发明公开

EP2106673A2 AMBIENT NOISE REDUCTION 审中-公开
标题翻译：环境降噪
公开(公告)号：EP2106673A2
公开(公告)日：2009-10-07
申请号：EP08701911.3
申请日：2008-01-23
申请人： Wolfson Microelectronics plc
发明人： SIBBALD, Alastair , HOWLE, Martin
IPC分类号： H04R3/00 , G10K11/178
CPC分类号： H04R3/00 , G10K11/178 , G10K2210/1081 , H04R1/1083
摘要： 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.

3. 发明授权

EP2225754B1 NOISE CANCELLATION SYSTEM WITH GAIN CONTROL BASED ON NOISE LEVEL 有权转让
标题翻译：基于声音LEVEL增益控制噪声减小系统
公开(公告)号：EP2225754B1
公开(公告)日：2014-06-25
申请号：EP08865788.7
申请日：2008-12-11
申请人： Wolfson Microelectronics plc
发明人： SIBBALD, Alastair , ALCOCK, Robert David
IPC分类号： G10K11/178
CPC分类号： G10K11/178 , G10K2210/1081 , G10K2210/3056

4. 发明公开

EP1979892A1 AMBIENT NOISE REDUCTION ARRANGEMENTS 有权转让
标题翻译：安排环境噪声还原
公开(公告)号：EP1979892A1
公开(公告)日：2008-10-15
申请号：EP07700390.3
申请日：2007-01-17
申请人： Wolfson Microelectronics plc
发明人： SIBBALD, Alastair
IPC分类号： G10K11/178
CPC分类号： G10K11/178 , G10K11/17857 , H04R1/1083
摘要： A feedforward ambient noise reduction arrangement (10) includes, within a housing, a loudspeaker device for directing sound energy into an ear of a listener. Disposed externally of the housing, and positioned to sense ambient noise on its way to the listener's ear, are plural microphone devices (21-15) capable of converting the sensed ambient noise into electrical signals for application to the loudspeaker to generate an acoustic signal opposing the ambient noise. Importantly, the overall arrangement is such that the acoustic signal is generated by said loudspeaker means in substantial time alignment with the arrival of said ambient noise at the listener's ear.

5. 发明授权

EP1979892B1 AMBIENT NOISE REDUCTION ARRANGEMENTS 有权转让
标题翻译：安排环境噪声还原
公开(公告)号：EP1979892B1
公开(公告)日：2014-10-08
申请号：EP07700390.3
申请日：2007-01-17
申请人： Wolfson Microelectronics plc
发明人： SIBBALD, Alastair
IPC分类号： G10K11/178
CPC分类号： G10K11/178 , G10K11/17857 , H04R1/1083
摘要： A feedforward ambient noise reduction arrangement (10) includes, within a housing, a loudspeaker device for directing sound energy into an ear of a listener. Disposed externally of the housing, and positioned to sense ambient noise on its way to the listener's ear, are plural microphone devices (21-15) capable of converting the sensed ambient noise into electrical signals for application to the loudspeaker to generate an acoustic signal opposing the ambient noise. Importantly, the overall arrangement is such that the acoustic signal is generated by said loudspeaker means in substantial time alignment with the arrival of said ambient noise at the listener's ear.

6. 发明公开

EP2225754A1 NOISE CANCELLATION SYSTEM WITH GAIN CONTROL BASED ON NOISE LEVEL 有权转让
标题翻译：基于声音LEVEL增益控制噪声减小系统
公开(公告)号：EP2225754A1
公开(公告)日：2010-09-08
申请号：EP08865788.7
申请日：2008-12-11
申请人： Wolfson Microelectronics plc
发明人： SIBBALD, Alastair , ALCOCK, Robert David
IPC分类号： G10K11/178
CPC分类号： G10K11/178 , G10K2210/1081 , G10K2210/3056
摘要： A noise cancellation system is provided, for generating a noise cancellation signal to be added to a wanted signal to mitigate the effects of ambient noise. The system comprises: an input, for receiving an input signal representing ambient noise; a detector, for detecting a magnitude of said input signal; and a voice activity detector, for determining voiceless periods when said input signal does not contain a signal representing a voice. The detector is adapted to detect the magnitude of said input signal during said voiceless periods, and the system is adapted to operate in a first mode when said input signal is above a threshold value, and a second mode when said input signal is below the threshold value. The first mode comprises generating a noise cancellation signal with a first magnitude for at least partially cancelling the ambient noise. The second mode comprises generating a noise cancellation signal with a second magnitude that is less than the first magnitude.

7. 发明公开

EP2002687A1 AMBIENT NOISE-REDUCTION CONTROL SYSTEM 有权转让
标题翻译：控制系统环境降噪
公开(公告)号：EP2002687A1
公开(公告)日：2008-12-17
申请号：EP07732160.2
申请日：2007-03-28
申请人： WOLFSON MICROELECTRONICS PLC
发明人： SIBBALD, Alastair
IPC分类号： H04R3/00
CPC分类号： H04R3/00 , G10K11/178 , G10K2210/1081 , G10K2210/3056 , H04R1/1083
摘要： The invention provides a noise reduction control system for an ear-worn speaker-carrying device (“ESD”). The system is configured to sense ambient noise and to develop electrical signals which can be used to reduce the amount of said ambient noise audible to a wearer of the ESD. The system sets a plurality of predetermined and discrete noise reduction levels and automatically responds to at least one controlling event, outside the control of the wearer, to set the degree of noise reduction to one of those discrete levels. Typically, the system inverts and filters the electrical signals relating to ambient noise and feeds the inverted and filtered signals to the speaker of the ESD in time for the speaker to generate sounds capable of interfering destructively with the ambient noise.

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