公开(公告)号：US09847713B2

公开(公告)日：2017-12-19

申请号：US15070508

申请日：2016-03-15

Applicant: Apple Inc.

Inventor： David C. Breece, III ,  Roderick B. Hogan ,  Nathan A. Johanningsmeier

IPC: H03F1/00 ,  H02M3/07 ,  H03F3/183 ,  H03F3/19

CPC classification number: H02M3/07 ,  H02M2003/071 ,  H03F1/0261 ,  H03F3/183 ,  H03F3/19 ,  H03F3/3432 ,  H03F2200/03

Abstract: A charge pump circuit having first and second input nodes to be coupled to a first power source, and top and bottom output nodes and an intermediate node. The charge pump circuit produces i) a voltage at the top output node that is higher than a voltage of the intermediate node, and ii) a voltage at the bottom output node that is lower than the voltage of the intermediate node. A bias voltage source has i) an input that is to be coupled to a second power source and ii) an output that produces an output voltage, which is a predetermined proportion of an input voltage at the input and that follows the input voltage downward and upward as the input voltage sags and recovers, respectively. The output of the bias voltage source is directly connected to the intermediate node of the output stage. Other embodiments are also described.

公开(公告)号：US09332343B2

公开(公告)日：2016-05-03

申请号：US14252472

申请日：2014-04-14

Applicant: Apple Inc.

Inventor： Roderick B. Hogan ,  Nathan A. Johanningsmeier

IPC: H04R29/00 ,  H04R3/00

CPC classification number: H04R3/00 ,  H04R3/007 ,  H04R29/00 ,  H04R29/001

Abstract: A programmed data processor obtains a number of input voltage measurements for a number of speaker drivers, respectively, and a sensed shared current being a measure of current in a single power supply rail that is feeding power to each of a number of audio amplifiers while the audio amplifiers are driving the speaker drivers in accordance with a number of audio channel test signals, respectively. The programmed data processor computes an estimate of electrical input impedance of each of the speaker drivers using the input voltage measurement for the speaker driver and using the sensed shared current. Other embodiments are also described and claimed.

Abstract translation: 编程数据处理器分别为多个扬声器驱动器获得多个输入电压测量值，并且感测到的共享电流是单个电源轨道中的电流测量，该电源轨道将功率馈送到多个音频放大器中的每一个，同时 音频放大器分别根据多个音频通道测试信号驱动扬声器驱动器。 编程数据处理器使用扬声器驱动器的输入电压测量并使用感测到的共享电流来计算每个扬声器驱动器的电输入阻抗的估计。 还描述和要求保护其他实施例。

公开(公告)号：US20160094917A1

公开(公告)日：2016-03-31

申请号：US14679807

申请日：2015-04-06

Applicant: Apple Inc.

Inventor： Christopher Wilk ,  Alexander V. Salvatti ,  Thomas M. Jensen ,  Scott P. Porter ,  Ruchir M. Dave ,  Andrew P. Bright ,  Roderick B. Hogan

IPC: H04R9/02 ,  H04R7/16

CPC classification number: H04R3/007 ,  H04R9/06 ,  H04R2499/11

Abstract: A micro speaker having a capacitive sensor to sense a motion of a speaker diaphragm, is disclosed. More particularly, embodiments of the micro speaker include a conductive surface of a diaphragm facing conductive surfaces of several capacitive plate sections across a gap. The diaphragm may be configured to emit sound forward away from a magnet of the micro speaker, and the capacitive plate sections may be supported on the magnet behind the diaphragm. In an embodiment, the gap provides an available travel for the diaphragm, which may be only a few millimeters. A sensing circuit may sense capacitances of the conductive surfaces to limit displacement of the diaphragm to within the available travel.

Abstract translation: 公开了一种具有感应扬声器振动板的运动的电容传感器的微型扬声器。 更具体地，微型扬声器的实施例包括隔着间隙面对几个电容板部分的导电表面的隔膜的导电表面。 隔膜可以被配置为向远离微型扬声器的磁体发出声音，并且电容板部分可以被支撑在隔膜后面的磁体上。 在一个实施例中，间隙为隔膜提供可用的行程，其可以仅为几毫米。 感测电路可以感测导电表面的电容，以将隔膜的位移限制在可用行程内。

公开(公告)号：US09247345B2

公开(公告)日：2016-01-26

申请号：US14252461

申请日：2014-04-14

Applicant: Apple Inc.

Inventor： Roderick B. Hogan ,  Nathan A. Johanningsmeier

IPC: H04R29/00 ,  H04R3/00

CPC classification number: H04R29/001 ,  H04R3/12

Abstract: A programmed data processor receives input voltage measurements for a number of speaker drivers, wherein each of the voltage measurements may be a sensed or estimated sequence of time-domain samples of a respective speaker driver input voltage that is over a different time frame. The processor obtains a sensed shared current, being a measure of current in a single power supply rail that is feeding power to each of a number of audio amplifiers, while the audio amplifiers are driving the speaker drivers in accordance with a number of audio channel signals, respectively. The processor computes an estimate of electrical input impedance for each of the speaker drivers using the sensed shared current and the input voltage measurements. Other embodiments are also described and claimed.

Abstract translation: 编程数据处理器接收多个扬声器驱动器的输入电压测量值，其中每个电压测量可以是在不同时间帧上的相应扬声器驱动器输入电压的感测或估计的时域样本序列。 处理器获得感测到的共享电流，其是在单个电源轨中的电流测量，该电源轨正在向多个音频放大器中的每一个供电，同时音频放大器根据多个音频通道信号驱动扬声器驱动器 ， 分别。 处理器使用感测到的共享电流和输入电压测量来计算每个扬声器驱动器的电输入阻抗的估计。 还描述和要求保护其他实施例。