公开(公告)号：US20080144848A1

公开(公告)日：2008-06-19

申请号：US11955862

申请日：2007-12-13

申请人： Markus Buck ,  Tim Haulick ,  Martin Rossler ,  Gerhard Uwe Schmidt ,  Walter Schnug

发明人： Markus Buck ,  Tim Haulick ,  Martin Rossler ,  Gerhard Uwe Schmidt ,  Walter Schnug

IPC分类号： H04B3/20

CPC分类号： H04M9/082

摘要： An echo reduction system includes a signal analysis filter that converts an input into sub-band signals. A signal down-sampling circuit down-samples the sub-band signals at a first down-sampling rate. An echo analysis filter converts a loudspeaker signal into echo sub-band signal that are further processed by an echo down-sampling circuit. The circuit down-samples the echo sub-band signals at a second down-sampling rate to generate down-sampled echo sub-band signals. An echo compensation filter folds the down-sampled echo sub-band signals with an estimated impulse response of a loudspeaker-room-input system. A second echo down-sampling circuit down-samples the folded down-sampled echo sub-band signals at a third down-sampling rate to generate estimated echo sub-band signals. The first down-sampling rate is equal to the product of the second and third down-sampling rates.

摘要翻译： 回波减少系统包括将输入转换为子带信号的信号分析滤波器。 信号下采样电路以第一下采样率对子带信号进行下采样。 回波分析滤波器将扬声器信号转换成由回波下采样电路进一步处理的回波子带信号。 电路以第二次下采样率对回波子带信号进行下采样以产生下采样的回波子带信号。 回波补偿滤波器用扬声器室输入系统的估计的脉冲响应折叠下采样的回波子带信号。 第二回波下采样电路以三次下采样率对折叠的下采样回波子带信号进行下采样，以产生估计的回波子带信号。 第一个下采样率等于第二次和第三次下采样率的乘积。

公开(公告)号：US20080151984A1

公开(公告)日：2008-06-26

申请号：US11855575

申请日：2007-09-14

申请人： Gerhard Uwe Schmidt ,  Mohamed Krini ,  Martin Rossler

发明人： Gerhard Uwe Schmidt ,  Mohamed Krini ,  Martin Rossler

IPC分类号： H03K5/159

CPC分类号： H03H17/0642 ,  H03H17/0685

摘要： A sampling rate conversion system reduces the signal processing burdens carried by cellular phones, headsets, and other electronic devices. Because the system consumes fewer resources to convert between signal sampling rates, the system may significantly reduce processing time and resource requirements in the device. As a result, the device may instead devote resources to performing other useful tasks, such as interacting with the user through a graphical user interface and performing selected processing tasks.

摘要翻译： 采样率转换系统减少了蜂窝电话，耳机和其他电子设备携带的信号处理负担。 由于系统消耗较少的资源以在信号采样率之间进行转换，所以系统可能会显着减少设备中的处理时间和资源需求。 因此，设备可以替代地投入资源来执行其他有用的任务，例如通过图形用户界面与用户交互并执行所选择的处理任务。