公开(公告)号：US20140140542A1

公开(公告)日：2014-05-22

申请号：US13682012

申请日：2012-11-20

Applicant: POLYCOM, INC.

Inventor： Jarrod M. Lumpkin

IPC: H04B3/02

CPC classification number: H04B3/02 ,  H03F3/217

Abstract: Audio transmitter circuitry is disclosed that is configurable into different modes by the user, and can output either a differential or single-ended audio signal on two signal wires. Depending on the mode, the transmitter deals with noise on the signal wires by adjusting the input resistance that such noise sees looking into the transmitter. If the transmitter is configured in a differential mode, the input resistance looking back into the transmitter from the perspective of the noise on both signal wires is relatively high. If the transmitter is configured in a single ended mode, the input resistance of noise looking back from the active signal wire into the transmitter is relatively low, to in effect ground such noise back into the transmitter, without significantly presenting such noise to the receiver.

Abstract translation: 公开了可由用户配置成不同模式的音频发射器电路，并且可以在两条信号线上输出差分或单端音频信号。 根据模式，发射机通过调整这种噪声看到发射机的输入电阻来处理信号线上的噪声。 如果变送器配置为差分模式，则从两个信号线上的噪声的角度看，返回到发射机的输入电阻相对较高。 如果发射机配置为单端模式，则从有源信号线回送到发射机中的噪声的输入电阻相对较低，从而实际上将这种噪声接地回到发射机中，而不会对接收机显着地呈现这种噪声。

公开(公告)号：US09590694B2

公开(公告)日：2017-03-07

申请号：US13682012

申请日：2012-11-20

Applicant: Polycom, Inc.

Inventor： Jarrod M. Lumpkin

IPC: H03F99/00 ,  H04B3/02 ,  H03F3/217

CPC classification number: H04B3/02 ,  H03F3/217

Abstract: Audio transmitter circuitry is disclosed that is configurable into different modes by the user, and can output either a differential or single-ended audio signal on two signal wires. Depending on the mode, the transmitter deals with noise on the signal wires by adjusting the input resistance that such noise sees looking into the transmitter. If the transmitter is configured in a differential mode, the input resistance looking back into the transmitter from the perspective of the noise on both signal wires is relatively high. If the transmitter is configured in a single ended mode, the input resistance of noise looking back from the active signal wire into the transmitter is relatively low, to in effect ground such noise back into the transmitter, without significantly presenting such noise to the receiver.

Abstract translation: 公开了可由用户配置成不同模式的音频发射器电路，并且可以在两条信号线上输出差分或单端音频信号。 根据模式，发射机通过调整这种噪声看到发射机的输入电阻来处理信号线上的噪声。 如果变送器配置为差分模式，则从两个信号线上的噪声的角度看，返回到发射机的输入电阻相对较高。 如果发射机配置为单端模式，则从有源信号线回送到发射机中的噪声的输入电阻相对较低，从而实际上将这种噪声接地发射回发射机，而不会对接收机显着地呈现这种噪声。