CN1281988A - 一种信号采样方法及信号检测显示系统 - Google Patents

一种信号采样方法及信号检测显示系统 Download PDF

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CN1281988A
CN1281988A CN 00124469 CN00124469A CN1281988A CN 1281988 A CN1281988 A CN 1281988A CN 00124469 CN00124469 CN 00124469 CN 00124469 A CN00124469 A CN 00124469A CN 1281988 A CN1281988 A CN 1281988A
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CN1137386C (zh
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孙景琪
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Rigol Technologies Inc
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Abstract

本发明公开了一种信号采样方法及信号检测显示系统,属于电子测量及自动测试仪器制造领域，其特征在于：采样点的时间间隔为nT±ΔT(n可为0,1,2,3…)，其中,T为被测信号的周期,ΔT=sT,0<s<1,采样结果输入计算机进行处理,该方法及采用该方法的装置可以实现对高频周期信号的测量和其他处理。

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一种信号采样方法及信号检测显示系统
一种信号采样方法及信号检测显示系统，属于电子测量及自动测试仪器制造领域。
在数据采集系统中，对信号进行时域或频域的测量，主要使用A／D(模数转换)技术。根据柰奎斯特采样定理，一周期信号的采样频率应大于该信号最高频率的两倍，而实际上，采样频率至少要达到信号频率的10至20倍，才能给出足够的信号细节。因此，当测量高频信号时，对A／D提出了苛刻的要求，有时，甚至是不可能的。为了解决上述问题，采用低速A/D测量频率尽可能高的信号，曾提出过多种采样方法，常用的两种等效时间采样技术，即△T方法和随机采样法。ΔT方法为：对周期信号第N个点的采样是相对于触发事件延迟了NΔT的时间后进行的，并将各采样点的数据依次存于存储器中，如：
第1采样点是以触发电平为基准，延迟ΔT后采样，数据存于存储器；
第2采样点是以触发电平为基准，延迟2ΔT后采样，数据存于存储器；
第n采样点是以触发电平为基准，延迟nΔT后采样，数据存于存储器。
在恢复信号波形时，可依次从存储器中调出各采样点值输出显示。该方法的难度在于要提供一精确的定时系统，并要产生极短的时延ΔT。随机采样方法为：每一组采样点是随机时刻采样的，与触发无关，这种采样方法在控制上难度较大，也不易实现。
本发明的目的在于提供一种在较低采样速率条件下，测量频率尽可能高的周期信号的方法。
本发明采用的方法，其特点在于：采样点的时间间隔为nT±ΔT，其中，T为被测信号的周期，n可为0，1，2，3……，ΔT=sT，0＜s＜1。
利用该方法的信号检测显示装置，由测频率单元、A／D单元、缓冲存储器、采样信号发生器、计算机构成，其中，测频率单元的输入端接被测信号，输出端与输入端接计算机，A／D单元的输入端接被测信号，输出端接缓冲存储器，缓冲存储器的输出端接计算机，控制端接计算机，采样信号发生器的输入端接计算机，输出端将其产生的采样信号输入A/D单元，其中，由计算机向采样信号发生器输出控制信号，使其产生周期为nT±ΔT(n可为0，1，2，3……)的采样信号，其中，T为被测信号的周期，ΔT=sT，0＜s＜1。该装置还可包含有一个信号输入端接被测信号、控制端与计算机相连、输出端分别接测频率单元和A／D单元的输入衰减器与放大器，及输入端分别接采样信号发生器和计算机的输出衰减器与放大器。
利用该方法和系统，可使用低速A/D采集频率尽可能高的周期信号。
为结合实施例进一步描述本发明，现将所用附图说明如下：
附图1：系统组成框图。
附图2：信号检测及显示装置的组成框图。
附图3：信号采样处理过程。
见图1，2，3。被测信号9经输入衰减器与放大器1后，经测频率单元2后，得到信号周期T，将该T值经接口3送入计算机4，计算机4根据T值计算采样间隔时间ΔT、采样周期nT±ΔT、采样频率fH，然后向采样信号发生器5发出nT±ΔT的控制信号，控制采样信号发生器5，使其产生并向A／D单元6提供精确的采样信号。A／D单元6根据采样信号发生器5提供的控制脉冲对输入衰减器与放大器1的输出信号进行采样，并将各采样点的数据存入缓冲存储器7，计算机4可依次从缓冲存储器7中读出数据，并进行必要处理，然后送显示器恢复出被测信号9的波形。
见图2，采样信号发生器5产生的信号可以输出到输出衰减器与放大器8，在计算机4的控制下产生所需要的信号10，使其成为幅度可控、频率可调的信号源。
计算机4也可对采样后的数据进行数学处理，获得被测信号的频域特性及其他所需的参量。
当测量对象是周期信号时，起始采样点的位置可以任意设定。使用该方法实现了使用低速A/D采集频率尽可能高的周期信号的目的，大大降低了检测代价，而且可以实现高频周期信号的频率检测及信号的输出。

Claims (3)

1．一种信号采样方法，其特征在于：采样点的时间间隔为nT±ΔT(n可为0，1，2，3，...)，其中，T为被测信号的周期，ΔT=sT，0＜s＜1。
2．一种按照权利要求1所述的信号采样方法所实现的信号检测显示装置，其特征在于：该装置由测频率单元(2)、A/D单元(6)、缓冲存储器(7)、采样信号发生器(5)、计算机(4)构成，其中，测频率单元(2)的输入端接被测信号(9)，输出端与控制端接计算机(4)，A/D单元(6)的输入端接被测信号(9)，输出端接缓冲存储器(7)，控制端接计算机(4)，缓冲存储器(7)的输出端和控制端接计算机(4)，采样信号发生器(5)的输入端接计算机(4)，输出端将其产生的采样信号输入A／D单元(6)，其中，由计算机(4)向采样信号发生器(5)输出控制信号，使其产生周期为nT±ΔT的采样信号。
3．一种按照权利要求2所述的信号采样方法所实现的信号检测装置，其特征在于：该装置还包含有一个输入衰减器与放大器(1)，输出衰减器与放大器(8)，其中输入衰减器与放大器(1)的信号输入端接被测信号(9)，控制端与计算机(4)相连，输出端分别接测频率单元(2)和A/D单元(6)，输出衰减器与放大器(8)的输入端分别接采样信号发生器(5)和计算机(4)。
CNB001244698A 2000-09-08 2000-09-08 一种信号采样方法及信号检测显示系统 Expired - Fee Related CN1137386C (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104407190A (zh) * 2014-11-26 2015-03-11 电子科技大学 一种全数字化的随机采样方法

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* Cited by examiner, † Cited by third party
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CN102098051B (zh) * 2010-12-31 2013-09-04 余成 一种高频周期信号的采样方法和系统

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104407190A (zh) * 2014-11-26 2015-03-11 电子科技大学 一种全数字化的随机采样方法
CN104407190B (zh) * 2014-11-26 2017-02-01 电子科技大学 一种全数字化的随机采样方法

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