公开(公告)号：US4635217A

公开(公告)日：1987-01-06

申请号：US659055

申请日：1984-10-09

申请人： Michael O'Connor ,  Randall L. Jackson ,  David P. Marple

发明人： Michael O'Connor ,  Randall L. Jackson ,  David P. Marple

IPC分类号： H04B1/10 ,  G06F15/20 ,  G06G7/19

CPC分类号： H04B1/10

摘要： A noise threshold estimator for use in a high signal density environment defines a noise threshold level for a plurality of frequency divided channels such that X number of said channels will be defined as being active channels and the remaining channels as being inactive. Using a novel closed loop feedback technique to define a noise threshold level, the noise threshold estimator first compares the signal level of each incoming channel with an analog threshold voltage. A logic device counts the number of active channels and then scales that number according to a predetermined scaling function. The scaled binary number is added with the noise threshold level from the previous clocked interval to define a new noise threshold level. This binary noise threshold level is converted into an analog voltage and fedback to the feedback input of the noise comparison devices to be compared with the signal level of each incoming channel.

摘要翻译： 用于高信号密度环境的噪声阈值估计器定义了多个分频信道的噪声阈值电平，使得X个所述信道将被定义为活动信道，而其余信道被定义为非活动信道。 使用新颖的闭环反馈技术来定义噪声阈值电平，噪声阈值估计器首先将每个输入信道的信号电平与模拟阈值电压进行比较。 逻辑设备对活动通道的数量进行计数，然后根据预定的缩放功能对该数量进行缩放。 缩放的二进制数加上来自上一个时钟间隔的噪声阈值电平，以定义新的噪声阈值电平。 该二进制噪声阈值电平被转换为模拟电压并反馈到噪声比较装置的反馈输入，以与每个输入信道的信号电平进行比较。

公开(公告)号：US4646254A

公开(公告)日：1987-02-24

申请号：US892453

申请日：1986-08-04

申请人： Michael O'Connor ,  Randall L. Jackson ,  David P. Marple

发明人： Michael O'Connor ,  Randall L. Jackson ,  David P. Marple

IPC分类号： G01R23/15 ,  H04B15/00 ,  G06F15/20 ,  G06G7/19

CPC分类号： G01R23/15

摘要： A noise threshold estimating method for use in a high signal density environment defines a noise threshold level for a plurality of frequency divided channels such that X number of said channels will be defined as being active channels and the remaining channels as being inactive. Using a novel closed loop feedback technique to define a noise threshold level, the noise threshold estimator first compares the signal level of each incoming channel with an analog threshold voltage. A logic device counts the number of active channels and then scales that number according to a predetermined scaling function. The scaled binary number is added with the noise threshold level from the previous clocked interval to define a new noise threshold level. This binary noise threshold level is converted into an analog voltage and feedback to the feedback input of the noise comparison devices to be compared with the signal level of each incoming channel.

摘要翻译： 在高信号密度环境中使用的噪声阈值估计方法为多个分频信道定义噪声阈值电平，使得X个所述信道将被定义为活动信道，而剩余信道为非活动信道。 使用新颖的闭环反馈技术来定义噪声阈值电平，噪声阈值估计器首先将每个输入信道的信号电平与模拟阈值电压进行比较。 逻辑设备对活动通道的数量进行计数，然后根据预定的缩放功能对该数量进行缩放。 缩放的二进制数加上来自上一个时钟间隔的噪声阈值电平，以定义新的噪声阈值电平。 该二进制噪声阈值电平被转换为模拟电压并反馈到噪声比较装置的反馈输入端，以与每个输入信道的信号电平进行比较。