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公开(公告)号：US20180352358A1
公开(公告)日：2018-12-06
申请号：US15621946
申请日：2017-06-13
申请人： Apple Inc.
CPC分类号： H04S7/301 , H04R1/2811 , H04R1/403 , H04R3/005 , H04R3/04 , H04R3/12 , H04R29/002 , H04R2430/01 , H04S7/305
摘要： A loudspeaker cabinet has a number of pairs of microphones, each pair includes the same internal microphone and a different external microphone. For each pair of microphones, a process (i) receives a first audio signal of sound captured by the internal microphone and a second audio signal of sound captured by the different external microphone, (ii) estimates, using first and second audio signals, a radiation impedance, and (iii) computes a detection value based on the radiation impedance in a frequency band. A difference between (i) a currently computed detection value associated with a given pair of microphones and (ii) a previously computed detection value associated with said given pair, is computed. The sound produced by the cabinet is adjusted, in response to the computed difference meeting a threshold. Other embodiments are also described and claimed.
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公开(公告)号：US10149087B1
公开(公告)日：2018-12-04
申请号：US15621946
申请日：2017-06-13
申请人： Apple Inc.
CPC分类号： H04S7/301 , H04R1/2811 , H04R1/403 , H04R3/005 , H04R3/04 , H04R3/12 , H04R29/002 , H04R2430/01 , H04S7/305
摘要： A loudspeaker cabinet has a number of pairs of microphones, each pair includes the same internal microphone and a different external microphone. For each pair of microphones, a process (i) receives a first audio signal of sound captured by the internal microphone and a second audio signal of sound captured by the different external microphone, (ii) estimates, using first and second audio signals, a radiation impedance, and (iii) computes a detection value based on the radiation impedance in a frequency band. A difference between (i) a currently computed detection value associated with a given pair of microphones and (ii) a previously computed detection value associated with said given pair, is computed. The sound produced by the cabinet is adjusted, in response to the computed difference meeting a threshold. Other embodiments are also described and claimed.
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公开(公告)号：US11025406B2
公开(公告)日：2021-06-01
申请号：US16584012
申请日：2019-09-26
申请人： Apple Inc.
发明人： Michael F. Jean , Adam E. Kriegel , Brett D. George , Daniel C. Klingler , Girault W. Jones , Felipe Ferreri Tonello
摘要： A system and method to mitigate the temporary loss of the input sampling clocks when receiving audio data over the ARC or eARC interface of HDMI are provided. A media device may substitute an externally generated clock derived from a local crystal oscillator of the media device for the missing input sampling clock. The external clock may be synchronized to the frequency of the input sampling clock. The media device may synchronize the external clock to the audio data when there is a loss of the input sampling clock. When the input sampling clock of the audio data reappears, the media device may switch back from the external clock to the input sampling clock. When transitioning between the input sampling clock and the external clock, the media device may insert zero padding into the audio data samples to mute any potential glitch in the sound from an audio playback device.
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公开(公告)号：US20190222931A1
公开(公告)日：2019-07-18
申请号：US16362048
申请日：2019-03-22
申请人： Apple Inc.
CPC分类号： H04R3/04 , G10L21/0208 , G10L2021/02082 , H04R1/403 , H04R3/12 , H04R27/00 , H04R29/002 , H04R29/007 , H04R2227/005 , H04S7/305 , H04S7/307
摘要： An audio system includes one or more loudspeaker cabinets, each having loudspeakers. Sensing logic determines an acoustic environment of the loudspeaker cabinets. The sensing logic may include an echo canceller. A low frequency filter corrects an audio program based on the acoustic environment of the loudspeaker cabinets. The system outputs an omnidirectional sound pattern, which may be low frequency sound, to determine the acoustic environment. The system may produce a directional pattern superimposed on an omnidirectional pattern, if the acoustic environment is in free space. The system may aim ambient content toward a wall and direct content away from the wall, if the acoustic environment is not in free space. The sensing logic automatically determines the acoustic environment upon initial power up and when position changes of loudspeaker cabinets are detected. Accelerometers may detect position changes of the loudspeaker cabinets.
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公开(公告)号：US10299039B2
公开(公告)日：2019-05-21
申请号：US15613049
申请日：2017-06-02
申请人： Apple Inc.
摘要： An audio system includes one or more loudspeaker cabinets, each having loudspeakers. Sensing logic determines an acoustic environment of the loudspeaker cabinets. The sensing logic may include an echo canceller. A low frequency filter corrects an audio program based on the acoustic environment of the loudspeaker cabinets. The system outputs an omnidirectional sound pattern, which may be low frequency sound, to determine the acoustic environment. The system may produce a directional pattern superimposed on an omnidirectional pattern, if the acoustic environment is in free space. The system may aim ambient content toward a wall and direct content away from the wall, if the acoustic environment is not in free space. The sensing logic automatically determines the acoustic environment upon initial power up and when position changes of loudspeaker cabinets are detected. Accelerometers may detect position changes of the loudspeaker cabinets.
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公开(公告)号：US10264351B2
公开(公告)日：2019-04-16
申请号：US15613040
申请日：2017-06-02
申请人： Apple Inc.
摘要： An audio system embodiment includes a loudspeaker cabinet having at least one loudspeaker transducer and defining a longitudinal axis. Several microphones are distributed around the longitudinal axis, defining an array of microphones. A reference microphone is positioned in the loudspeaker cabinet, e.g., in a rear chamber of the at least one loudspeaker transducer. The audio system includes a processor and a memory having instructions that, when executed by the processor, cause the audio system to receive an audio signal from each distributed microphone and the reference microphone, and therefrom to estimate a direction, relative to the plurality of microphones, of a nearby, acoustically reflective surface. Responsive to the estimated direction, the audio system affects a mode of operation, e.g., beam forms an audio output in a selected direction corresponding to the estimated direction of the acoustically reflective surface. Related principles are described by way of reference to exemplary embodiments.
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公开(公告)号：US20180352333A1
公开(公告)日：2018-12-06
申请号：US15636967
申请日：2017-06-29
申请人： Apple Inc.
IPC分类号： H04R3/04 , G10L21/0208 , H04R1/40 , H04R29/00 , H04R3/12
CPC分类号： H04R3/04 , G10L21/0208 , G10L2021/02082 , H04R1/403 , H04R3/12 , H04R27/00 , H04R29/002 , H04R29/007 , H04R2227/005 , H04S7/305 , H04S7/307
摘要： An audio system includes one or more loudspeaker cabinets, each having loudspeakers. The system outputs an omnidirectional sound pattern to determine the acoustic environment. Sensing logic determines an acoustic environment of the loudspeaker cabinets. The sensing logic may include an echo canceller. A playback mode processor adjusts an audio program according to a playback mode determined from the acoustic environment of the audio system. The system may produce a directional pattern superimposed on an omnidirectional pattern, if the acoustic environment is in free space. The system may aim ambient content toward a wall and direct content away from the wall, if the acoustic environment is not in free space. The sensing logic automatically determines the acoustic environment upon initial power up and when position changes of loudspeaker cabinets are detected. Accelerometers may detect position changes of the loudspeaker cabinets.
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公开(公告)号：US20180352324A1
公开(公告)日：2018-12-06
申请号：US15613040
申请日：2017-06-02
申请人： Apple Inc.
摘要： An audio system embodiment includes a loudspeaker cabinet having at least one loudspeaker transducer and defining a longitudinal axis. Several microphones are distributed around the longitudinal axis, defining an array of microphones. A reference microphone is positioned in the loudspeaker cabinet, e.g., in a rear chamber of the at least one loudspeaker transducer. The audio system includes a processor and a memory having instructions that, when executed by the processor, cause the audio system to receive an audio signal from each distributed microphone and the reference microphone, and therefrom to estimate a direction, relative to the plurality of microphones, of a nearby, acoustically reflective surface. Responsive to the estimated direction, the audio system affects a mode of operation, e.g., beam forms an audio output in a selected direction corresponding to the estimated direction of the acoustically reflective surface. Related principles are described by way of reference to exemplary embodiments.
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公开(公告)号：US09992595B1
公开(公告)日：2018-06-05
申请号：US15611083
申请日：2017-06-01
申请人： Apple Inc.
CPC分类号： H04R29/002 , H04R1/403 , H04R3/005 , H04R3/04 , H04R3/12 , H04R2430/01
摘要： A loudspeaker cabinet has a number of pairs of microphones, each pair includes the same internal microphone and a different external microphone. For each pair of microphones, a process (i) receives a first audio signal of sound captured by the internal microphone and a second audio signal of sound captured by the different external microphone, (ii) estimates, using first and second audio signals, a radiation impedance, and (iii) computes a detection value based on the radiation impedance in a frequency band. A difference between (i) a currently computed detection value associated with a given pair of microphones and (ii) a previously computed detection value associated with said given pair, is computed. The sound produced by the cabinet is adjusted, in response to the computed difference meeting a threshold. Other embodiments are also described and claimed.
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公开(公告)号：US09928842B1
公开(公告)日：2018-03-27
申请号：US15275312
申请日：2016-09-23
申请人： Apple Inc.
发明人： Juha O. Merimaa , Bruce C. Po , Adam E. Kriegel
IPC分类号： H03G5/00 , G10L19/008 , H04S7/00 , H04S5/00 , H04S3/00
CPC分类号： G10L19/008 , H03G5/00 , H03G5/165 , H04S3/002 , H04S3/008 , H04S5/00 , H04S7/30 , H04S2400/01
摘要： Ambience extraction from a multichannel input signal is provided. The multichannel input signal is converted into a time-frequency representation. A cross-correlation coefficient is computed for each time and frequency in the time-frequency representation of the multichannel input signal. An autocorrelation is computed for each time and frequency in the time-frequency representation of the multichannel input signal. Using the cross-correlation coefficient and the autocorrelation, ambience extraction coefficients including crosstalk and same-side coefficients are computed as a function of a tuning parameter, the crosstalk coefficients being proportional to the tuning parameter and the tuning parameter being between a value of 0 and a value of 1. The ambience extraction coefficients are applied to extract a left ambience component and a right ambience component.
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