公开(公告)号：US20150008962A1

公开(公告)日：2015-01-08

申请号：US14322747

申请日：2014-07-02

Applicant: Wolfson Microelectronics plc

Inventor： Malcolm Blyth ,  Graeme Gordon Mackay

IPC: G01R19/04

CPC classification number: H03F1/0227 ,  H03F3/183 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/102

Abstract: Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input. Using the first digital signal provides an early indication of any increases in signal envelope whereas the second digital signal can allow a more accurate estimation.

Abstract translation: 用于检测和跟踪信号包络的方法和装置。 电路包括被配置为接收数据样本并输出与所述数据样本的幅度对应的第一值的绝对值电路。 信封跟踪器保持包络输出值，并将第一值与当前包络输出值进行比较，并且基于所述比较修改包络输出值，以提供具有预定攻击和衰减特性的包络输出值。 绝对值电路具有用于以第一采样率接收第一数字信号的第一输入和用于以高于第一采样率的第二采样率接收第一数字信号的插值版本的第二输入，并输出第一采样率 基于在第一输入处接收的样本的大小和在第二输入处接收的样本的值。 使用第一数字信号提供信号包络的任何增加的早期指示，而第二数字信号可以允许更准确的估计。