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公开(公告)号：US20170245052A1
公开(公告)日：2017-08-24
申请号：US15591808
申请日：2017-05-10
CPC分类号： H04R3/00 , H03F3/183 , H03F2200/03 , H03G3/348 , H04R29/004 , H04R2420/03 , H04R2420/05
摘要： A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias to a device microphone contact of the device connector via a biasing path. A capacitor is connected between a reference voltage node and a capacitor node of the biasing path. A first switch is located between the capacitor node and the device microphone contact. Detection circuitry detects disconnection of the peripheral connector and device connector; and control circuitry controls the switch to disable the biasing path.
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公开(公告)号：US20190220430A1
公开(公告)日：2019-07-18
申请号：US16256162
申请日：2019-01-24
CPC分类号： G06F13/385 , G06F13/122 , G06F13/382 , G06F13/4022
摘要： This application relates to methods and apparatus for transfer of data between a host device (400) and a peripheral device (300) via a USB Type-C connector (100; 304) of the host device. A data controller is described that has a path controller (309, 310; 706) for establishing signal paths between circuitry of the host device and contacts (101) of said USB Type-C connector. The path controller is operable in at least first and second modes. In the first mode the path controller establishes separate signal paths to each of at least first, second, third and fourth contacts (A6, A7, B6, B7) of the USB Type-C connector and a plurality of the established signal paths are for transfer of analogue audio data. In the second mode the path controller establishes a pair of signal paths to only a subset of said first to fourth contacts to provide a differential digital data path.
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公开(公告)号：US20200059200A1
公开(公告)日：2020-02-20
申请号：US16348824
申请日：2018-04-27
发明人： Graeme Gordon MACKAY , Lei ZHU , Ku HE , Vamsikrishna PARUPALLI
摘要： In accordance with embodiments of the present disclosure, a method for power supply rejection for an amplifier may include generating a correction signal by multiplying a quantity indicative of a power supply voltage of the amplifier by a transfer function defining a response from the power supply voltage of the amplifier to an output signal of the amplifier and subtracting the correction signal from a signal within a signal path of a circuit comprising the amplifier.
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公开(公告)号：US20160276984A1
公开(公告)日：2016-09-22
申请号：US15165737
申请日：2016-05-26
CPC分类号： H03F1/0227 , H03F3/183 , H03F3/68 , H03F2200/03 , H03F2200/102
摘要： Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input. Using the first digital signal provides an early indication of any increases in signal envelope whereas the second digital signal can allow a more accurate estimation.
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公开(公告)号：US20180316313A1
公开(公告)日：2018-11-01
申请号：US15582233
申请日：2017-04-28
发明人： Graeme Gordon MACKAY , Lei ZHU , Ku HE , Vamsikrishna PARUPALLI
CPC分类号： H03F1/0233 , H03F1/0227 , H03F1/025 , H03F1/30 , H03F3/187 , H03F3/213 , H03F3/45475 , H03F3/45973 , H03F3/45982 , H03F2200/03 , H03F2200/375 , H03F2200/511 , H03F2203/45022 , H03F2203/45042 , H03F2203/45152 , H03F2203/45212 , H03F2203/45528 , H03F2203/45588 , H03F2203/45594 , H03F2203/45596 , H03F2203/45601 , H03F2203/45681
摘要： In accordance with embodiments of the present disclosure, a method for power supply rejection for an amplifier may include generating a correction signal by multiplying a quantity indicative of a power supply voltage of the amplifier by a transfer function defining a response from the power supply voltage of the amplifier to an output signal of the amplifier and subtracting the correction signal from a signal within a signal path of a circuit comprising the amplifier.
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公开(公告)号：US20180101495A1
公开(公告)日：2018-04-12
申请号：US15291670
申请日：2016-10-12
CPC分类号： G06F13/387 , G06F1/3287 , G06F1/3296 , G06F13/124 , G06F13/405 , G06F13/4295 , H04L12/40143 , H04L12/4135
摘要： A distributed network system may include a shared communication bus that operates in accordance with a communication protocol and a plurality of devices coupled to the bus. In accordance with the communication protocol, when one or more of the plurality of devices is actively transmitting data on the bus, each of the plurality of devices receives data via the bus such that bidirectional communication is established among the plurality of devices via the bus, each of the plurality of devices monitors a bus state of the shared communication bus to avoid data contention and to synchronize receipt of encoded symbols and encoded messages comprising encoded symbols via the bus, and each actively transmitting device of the plurality of devices compares the bus state to a desired state of such actively transmitting device to determine a priority among actively transmitting devices of the plurality of devices with respect to the bus.
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公开(公告)号：US20170078814A1
公开(公告)日：2017-03-16
申请号：US15342232
申请日：2016-11-03
IPC分类号： H04R29/00
CPC分类号： H04R3/00 , H03F3/183 , H03F2200/03 , H03G3/348 , H04R29/004 , H04R2420/03 , H04R2420/05
摘要： A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias to a device microphone contact of the device connector via a biasing path. A capacitor is connected between a reference voltage node and a capacitor node of the biasing path. A first switch is located between the capacitor node and the device microphone contact. Detection circuitry detects disconnection of the peripheral connector and device connector; and control circuitry controls the switch to disable the biasing path.
摘要翻译： 用于与具有麦克风的可移动外围设备一起使用的主机设备，以及用于所述麦克风的偏置电路。 主机设备可以具有用于与相应的外围连接器形成配合连接的设备连接器。 偏置源被布置成经由偏置路径向设备连接器的设备麦克风接触件提供电偏压。 电容器连接在参考电压节点和偏置路径的电容器节点之间。 第一个开关位于电容器节点和设备麦克风接点之间。 检测电路检测外围连接器和设备连接器的断开; 并且控制电路控制开关以禁用偏置路径。
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