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公开(公告)号：US20200186927A1
公开(公告)日：2020-06-11
申请号：US16709075
申请日：2019-12-10
Inventor： John Paul LESSO , Mark James MCCLOY-STEVENS , John Bruce BOWLERWELL , Yanto SURYONO , Xin ZHAO , Morgan Timothy PRIOR
Abstract: This application relates to audio driving circuitry (100), and in particular to audio driving circuitry for outputting first and second audio driving signals for driving a stereo audio load (106), which may be a stereo audio load of an accessory apparatus (102) removably coupled to the audio driving circuitry in use. A load monitor (111) is provided for monitoring to monitor, from a monitoring node (112), an indication of a common mode return current passing through a common return path, together with an indication of a common mode component of the first and second audio driving signals and to determine an impedance characteristic of the stereo audio load. The load monitor (111) can provide dynamic monitoring of any significant change in load impedance. In some embodiments the load monitor (111) comprises an adaptive filter (301) which adapts a parameter of the filter which is related to the load impedance so as to determine the indication of load impedance.
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公开(公告)号：US20220060832A1
公开(公告)日：2022-02-24
申请号：US17516830
申请日：2021-11-02
Inventor： John Paul LESSO , Mark James MCCLOY-STEVENS , John Bruce BOWLERWELL , Yanto SURYONO , Xin ZHAO , Morgan Timothy PRIOR
Abstract: This application relates to audio driving circuitry (100), and in particular to audio driving circuitry for outputting first and second audio driving signals for driving a stereo audio load (106), which may be a stereo audio load of an accessory apparatus (102) removably coupled to the audio driving circuitry in use. A load monitor (111) is provided for monitoring to monitor, from a monitoring node (112), an indication of a common mode return current passing through a common return path, together with an indication of a common mode component of the first and second audio driving signals and to determine an impedance characteristic of the stereo audio load. The load monitor (111) can provide dynamic monitoring of any significant change in load impedance. In some embodiments the load monitor (111) comprises an adaptive filter (301) which adapts a parameter of the filter which is related to the load impedance so as to determine the indication of load impedance.
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公开(公告)号：US20230247362A1
公开(公告)日：2023-08-03
申请号：US18296266
申请日：2023-04-05
Inventor： John Paul LESSO , Mark James MCCLOY-STEVENS , John Bruce BOWLERWELL , Yanto SURYONO , Xin ZHAO , Morgan Timothy PRIOR
CPC classification number: H04R5/04 , H03F3/183 , H03G3/3005 , H04R29/001 , H04S1/007 , H04R5/02 , H03G2201/103
Abstract: This application relates to audio driving circuitry (100), and in particular to audio driving circuitry for outputting first and second audio driving signals for driving a stereo audio load (106), which may be a stereo audio load of an accessory apparatus (102) removably coupled to the audio driving circuitry in use. A load monitor (111) is provided for monitoring to monitor, from a monitoring node (112), an indication of a common mode return current passing through a common return path, together with an indication of a common mode component of the first and second audio driving signals and to determine an impedance characteristic of the stereo audio load. The load monitor (111) can provide dynamic monitoring of any significant change in load impedance. In some embodiments the load monitor (111) comprises an adaptive filter (301) which adapts a parameter of the filter which is related to the load impedance so as to determine the indication of load impedance.
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