公开(公告)号：US20170251299A1

公开(公告)日：2017-08-31

申请号：US15312874

申请日：2015-05-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Henry CHEN

IPC: H04R3/00 ,  H04R1/40

CPC classification number: H04R3/005 ,  H04R1/406 ,  H04R5/04 ,  H04R2201/405 ,  H04R2410/07 ,  H04R2430/03 ,  H04R2499/11

Abstract: Wind noise reduction in microphone signals. A first microphone signal is obtained from a first omnidirectional microphone and, contemporaneously, a second microphone signal is obtained from a second omnidirectional microphone. The first and second microphone signals are mixed to produce an output signal. Mixing involves weighting the first and second microphone signals by respective first and second signal weights to produce respective first and second weighted microphone signals, and summing the first and second weighted microphone signals together to produce the output signal. The first and second signal weights are calculated to minimise the power of the output signal.

公开(公告)号：US20190259367A1

公开(公告)日：2019-08-22

申请号：US15902165

申请日：2018-02-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Henry CHEN

IPC: G10K11/175 ,  H04S1/00 ,  G10L25/18

Abstract: A method of processing stereophonic audio content received in a first audio channel to be output to a first speaker and a second audio channel to be output to a second speaker, the method comprising: receiving the first and second audio channels; identifying a plurality of frequency sub-bands in the first audio channel; for each of the plurality of frequency sub-bands, determining an importance weighting based on a degree of audibility of the sub-band when combined with the remainder of sub-bands of the first audio channel and the second audio channel; on determining that a peak amplitude of the first audio channel is above a first clipping threshold, iteratively suppressing the sub-band of least importance in the first audio signal until the peak amplitude of the first audio signal is below the first clipping threshold; and outputting the suppressed first audio channel.

公开(公告)号：US20180367896A1

公开(公告)日：2018-12-20

申请号：US16112365

申请日：2018-08-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Henry CHEN

IPC: H04R3/00 ,  H04R1/40 ,  H04R5/04

Abstract: Wind noise reduction in microphone signals. A first microphone signal is obtained from a first omnidirectional microphone and, contemporaneously, a second microphone signal is obtained from a second omnidirectional microphone. The first and second microphone signals are mixed to produce an output signal. Mixing involves weighting the first and second microphone signals by respective first and second signal weights to produce respective first and second weighted microphone signals, and summing the first and second weighted microphone signals together to produce the output signal. The first and second signal weights are calculated to minimize the power of the output signal.

公开(公告)号：US20180234760A1

公开(公告)日：2018-08-16

申请号：US15312987

申请日：2015-06-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Henry CHEN ,  Thomas Ivan HARVEY

IPC: H04R3/00 ,  G10L21/0208

CPC classification number: H04R3/005 ,  G10L21/0208 ,  H04R1/086 ,  H04R2410/07 ,  H04R2430/03 ,  H04R2499/11

Abstract: Wind noise reduction is provided by obtaining a first signal from a first microphone and a contemporaneous second signal from a second microphone. A level of the first signal is compared to a level of the second signal, within a short or substantially instantaneous time frame. If the level of the first signal exceeds the level of the second signal by greater than a predefined difference threshold, a suppression is applied to the first signal.

公开(公告)号：US20180098152A1

公开(公告)日：2018-04-05

申请号：US15708890

申请日：2017-09-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Vitaliy SAPOZHNYKOV ,  Henry CHEN

IPC: H04R3/14 ,  H04R5/04 ,  H04R3/04

CPC classification number: H04R3/14 ,  H04R3/04 ,  H04R5/04 ,  H04R2430/01

Abstract: A crosstalk canceller for reducing acoustic crosstalk at a time of audio playback is derived by forming a channel frequency response for a nominated playback geometry, and decomposing the channel frequency response to derive a decomposition element such as a singular value decomposition matrix. A value of the decomposition element, such as the smallest singular value, is then adjusted to reduce spectral coloration, and filter coefficients of a crosstalk cancellation filter are derived from the adjusted decomposition element.

公开(公告)号：US20170041707A1

公开(公告)日：2017-02-09

申请号：US15304728

申请日：2015-04-17

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Henry CHEN

IPC: H04R3/00 ,  H04S7/00

CPC classification number: H04R3/005 ,  H04R1/265 ,  H04R2410/07 ,  H04R2430/03 ,  H04S7/30 ,  H04S2400/15 ,  H04S2420/01

Abstract: A method of mixing microphone signals. First and second microphone signals are obtained from respective first and second microphones. In at least one affected subband, the first and second microphone signals are mixed to produce first and second mixed signals. At least one reference subband of the first and second microphone signals is processed in order to identify a binaural cue between the first and second microphone signals, the reference subband being distinct from the or each affected subband. The affected subband in the first and second mixed signals is modified in order to re-emphasize the identified binaural cue.

Abstract translation: 一种混合麦克风信号的方法。 从相应的第一和第二麦克风获得第一麦克风信号和第二麦克风信号。 在至少一个受影响的子带中，混合第一和第二麦克风信号以产生第一和第二混合信号。 处理第一和第二麦克风信号的至少一个参考子带，以便识别第一麦克风信号和第二麦克风信号之间的双耳提示，参考子带不同于或受影响的子带。 第一和第二混合信号中受影响的子带被修改以便重新强调所识别的双耳线索。

公开(公告)号：US20200186923A1

公开(公告)日：2020-06-11

申请号：US16774926

申请日：2020-01-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Henry CHEN ,  Tom HARVEY ,  Brenton STEELE

IPC: H04R3/02 ,  H04R1/40 ,  H04R3/00 ,  G10L21/038

Abstract: An apparatus of reducing feedback noise in an acoustic system, the apparatus comprising: a first input for receiving a first signal derived from a first microphone associated with a first channel, the first signal comprising a first set of frequency sub-bands; a second input for receiving a second signal derived from a second microphone associated with a second channel, the second signal comprising second set of frequency sub-bands, the first and second sets of frequency sub-bands having matching frequency ranges, each frequency sub-band of the first and second sets of frequency sub-bands having a frequency of greater than a threshold frequency; and one or more processors configured to: determining feedback at a first speaker associated with the first channel; and responsive to determining feedback, mix each of the first set of frequency sub-bands with a corresponding one of the second set of frequency sub-bands to generate a mixed output signal comprising a mixed set of frequency sub-bands; wherein the mixing is performed so as to minimize the output power in each of the mixed set of frequency sub-bands whilst maintaining a stereo effect level difference in the mixed signal between the first and second signals within a level difference threshold range.