公开(公告)号：US20160294343A1

公开(公告)日：2016-10-06

申请号：US15175970

申请日：2016-06-07

Applicant: Apple Inc.

Inventor： Arvindh Krishnaswamy ,  Juha O. Merimaa ,  Kapil Krishnamurthy ,  Yuchao Song

IPC: H03G3/30

CPC classification number: H03G3/3005 ,  H03G3/20 ,  H03G3/3089

Abstract: Automatic gain control systems disclosed herein can incorporate a confidence metric that can estimate the accuracy of gain adjustments calculated by an automatic gain control module. The confidence metric may be based on a percentage of valid audio samples in a given period of time. Based on the confidence metric, the AGC response may be reduced, delayed, frozen, or otherwise altered from the baseline gain adjustment. Time-averaging process may be used to estimate the input signal power level and determine an appropriate baseline gain adjustment. Additionally, weighting functions can be adjusted to prevent overestimation of the signal power.

公开(公告)号：US09917562B2

公开(公告)日：2018-03-13

申请号：US15175970

申请日：2016-06-07

Applicant: Apple Inc.

Inventor： Arvindh Krishnaswamy ,  Juha O. Merimaa ,  Kapil Krishnamurthy ,  Yuchao Song

IPC: H03G3/30 ,  H03G3/20

CPC classification number: H03G3/3005 ,  H03G3/20 ,  H03G3/3089

Abstract: Automatic gain control systems disclosed herein can incorporate a confidence metric that can estimate the accuracy of gain adjustments calculated by an automatic gain control module. The confidence metric may be based on a percentage of valid audio samples in a given period of time. Based on the confidence metric, the AGC response may be reduced, delayed, frozen, or otherwise altered from the baseline gain adjustment. Time-averaging process may be used to estimate the input signal power level and determine an appropriate baseline gain adjustment. Additionally, weighting functions can be adjusted to prevent overestimation of the signal power.

公开(公告)号：US09401685B2

公开(公告)日：2016-07-26

申请号：US13800487

申请日：2013-03-13

Applicant: Apple Inc.

Inventor： Arvindh Krishnaswamy ,  Juha O. Merimaa ,  Kapil Krishnamurthy ,  Yuchao Song

IPC: H03G3/20 ,  H03G3/30

CPC classification number: H03G3/3005 ,  H03G3/20 ,  H03G3/3089

Abstract: Automatic gain control systems disclosed herein can incorporate a confidence metric that can estimate the accuracy of gain adjustments calculated by an automatic gain control module. The confidence metric may be based on a percentage of valid audio samples in a given period of time. Based on the confidence metric, the AGC response may be reduced, delayed, frozen, or otherwise altered from the baseline gain adjustment. Time-averaging process may be used to estimate the input signal power level and determine an appropriate baseline gain adjustment. Additionally, weighting functions can be adjusted to prevent overestimation of the signal power.

Abstract translation: 本文公开的自动增益控制系统可以包括可以估计由自动增益控制模块计算的增益调整的精度的置信度量度。 可信度度量可以基于给定时间段内的有效音频样本的百分比。 基于可信度度量，AGC响应可以被减小，延迟，冻结或者从基线增益调整改变。 时间平均过程可用于估计输入信号功率电平并确定适当的基线增益调整。 此外，可以调整加权函数以防止信号功率的过高估计。

公开(公告)号：US20130329912A1

公开(公告)日：2013-12-12

申请号：US13800487

申请日：2013-03-13

Applicant: APPLE INC.

Inventor： Arvindh Krishnaswamy ,  Juha O. Merimaa ,  Kapil Krishnamurthy ,  Yuchao Song

IPC: H03G3/20

CPC classification number: H03G3/3005 ,  H03G3/20 ,  H03G3/3089

Abstract: Automatic gain control systems disclosed herein can incorporate a confidence metric that can estimate the accuracy of gain adjustments calculated by an automatic gain control module. The confidence metric may be based on a percentage of valid audio samples in a given period of time. Based on the confidence metric, the AGC response may be reduced, delayed, frozen, or otherwise altered from the baseline gain adjustment. Time-averaging process may be used to estimate the input signal power level and determine an appropriate baseline gain adjustment. Additionally, weighting functions can be adjusted to prevent overestimation of the signal power.

Abstract translation: 本文公开的自动增益控制系统可以包括可以估计由自动增益控制模块计算的增益调整的精度的置信度量度。 可信度度量可以基于给定时间段内的有效音频样本的百分比。 基于可信度度量，AGC响应可以被减小，延迟，冻结或者从基线增益调整改变。 时间平均过程可用于估计输入信号功率电平并确定适当的基线增益调整。 此外，可以调整加权函数以防止信号功率的过高估计。