公开(公告)号：US09277315B2

公开(公告)日：2016-03-01

申请号：US14301115

申请日：2014-06-10

Applicant: ST-ERICSSON INDIA PVT. LTD. ,  ST-ERICSSON SA

Inventor： Sanjeev Ranganathan ,  Shyam Somayajula ,  Srinath Sridharan ,  Lionel Cimaz

IPC: H04R3/00 ,  G10K11/00

CPC classification number: H04R3/002 ,  G10K11/002 ,  H04R3/00 ,  H04R3/007

Abstract: Systems and methods for suppressing pop-up noise in an audio signal are disclosed. The system includes a driver circuit shared by a pin interface and a complementary pin interface. A control unit is coupled to the pin interface and the complementary pin interface. To activate the pin interface, the control unit is configured to first activate the driver output at the complementary pin interface. Once the complementary pin interface achieves a preset voltage, the driver output is switched to the pin interface by the control unit. In addition, the driver circuit can be calibrated for a DC offset on the complementary pin interface by re-using calibration data calculated at the pin interface. Further, DC correction signals can be provided from a pre-biasing circuit based on the calibration data of the driver circuit.

Abstract translation: 公开了用于抑制音频信号中的弹出噪声的系统和方法。 该系统包括由引脚接口和互补引脚接口共享的驱动器电路。 控制单元耦合到引脚接口和互补引脚接口。 要激活引脚接口，控制单元配置为首先在互补引脚接口处激活驱动器输出。 一旦互补引脚接口达到预设电压，驱动器输出就由控制单元切换到引脚接口。 此外，可以通过重新使用在引脚接口处计算出的校准数据，在互补引脚接口上校准驱动器电路的直流偏移。 此外，可以基于驱动器电路的校准数据从预偏置电路提供直流校正信号。

公开(公告)号：US20140139046A1

公开(公告)日：2014-05-22

申请号：US13995365

申请日：2012-02-09

Applicant: ST-ERICSSON SA

Inventor： Gajendranath Chowdary ,  Ravpreet Singh ,  Shyam Somayajula

IPC: H04R3/00 ,  H02J7/00

CPC classification number: H04R3/00 ,  H02J7/0042 ,  H02J7/0055 ,  H04R2410/00 ,  Y10T307/858

Abstract: An electrical interface circuit is disclosed. The circuit comprises a microphone circuit (100); a battery charger circuit (200); and an electrical connector (300) for connecting said electrical interface circuit to an external device. The electrical connector has a pin (302) on which signals are multiplexed for connecting either the battery charger circuit to an external supply voltage or the microphone circuit to an external microphone. The battery charger circuit comprises an amplifying circuit (202) for controlling voltage or current to a battery (400) at battery charging and a p-type power transistor. The pin is connected to the microphone circuit and to a source of the p-type power transistor, and when a voltage applied to the pin exceeds the battery voltage, the p-type power transistor will provide current from the pin to the charger circuit, and otherwise the charger circuit and battery is disconnected from the pin. A method of multiplexing signals on the electrical interface circuit is also disclosed.

Abstract translation: 公开了一种电接口电路。 该电路包括麦克风电路（100）; 电池充电器电路（200）; 以及用于将所述电接口电路连接到外部设备的电连接器（300）。 电连接器具有引脚（302），信号被多路复用以将电池充电器电路连接到外部电源电压或麦克风电路连接到外部麦克风。 电池充电器电路包括用于在电池充电期间控制电池（400）的电压或电流的放大电路（202）和p型功率晶体管。 引脚连接到麦克风电路和p型功率晶体管的源极，并且当施加到引脚的电压超过电池电压时，p型功率晶体管将从引脚向充电器电路提供电流， 否则充电器电路和电池与引脚断开连接。 还公开了一种在电接口电路上复用信号的方法。