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A trigger signal generation method for an adjustable frequency divider

A technology for triggering signals and generating methods, which is applied in the field of signal processing and can solve problems such as waveform display shaking

Active Publication Date: 2021-05-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The holdoff time setting is very useful for the stable display of FM / AM / PM signals, but if the trigger holdoff time is set incorrectly, the oscilloscope will still overlap signals with different "rising edges" as trigger points, resulting in waveform display shaking

Method used

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  • A trigger signal generation method for an adjustable frequency divider
  • A trigger signal generation method for an adjustable frequency divider
  • A trigger signal generation method for an adjustable frequency divider

Examples

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Embodiment

[0023] image 3 It is a flowchart of a method for generating a trigger signal of an adjustable frequency divider in the present invention.

[0024] In this embodiment, the initial frequency division number, sensitivity parameter and pulse width detector operating clock of the adjustable frequency divider are set;

[0025] Initialize the frequency division number N of the adjustable frequency divider as 1;

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Abstract

The invention discloses a method for generating a trigger signal of an adjustable frequency divider. The input signal is frequency-divided and then output, and then the pulse width of the output signal is measured, and periodic feature detection is performed, and then the pulse width count value sequence is passed through Smooth filtering, and judge whether the filtered sequence value is greater than the set threshold, if it is greater, increase the frequency division number of the adjustable frequency divider, update the output, and measure and judge again until it is less than the set threshold, realizing periodic triggering The rapid and automatic generation of signals solves the problem of synchronous triggering of complex signals, and can automatically present stable waveforms of complex signals on the oscilloscope, making the trigger function of the oscilloscope more intelligent.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and more specifically relates to a method for generating a trigger signal of an adjustable frequency divider. Background technique [0002] As we all know, by setting specific trigger conditions, the oscilloscope can capture, store and stably display the measured signals that meet the conditions (characteristics). However, for complex signals, there may be multiple similar signal features in one cycle, which correspond to multiple trigger points, resulting in unstable waveform display. exist figure 1 In the left figure shown, the "rising edge" trigger condition is satisfied on the three rising edges of the input signal, therefore, in the figure 1 In the right graph shown, the waveform shows instability. To this end, the oscilloscope introduces the trigger holdoff function to solve this problem: after the oscilloscope triggers once, it will start the trigger holdoff time count, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R13/02
CPCG01R13/0254
Inventor 张沁川扈雅青黄武煌潘卉青邱渡裕叶芃
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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