Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Digital synchronous sampling method

A synchronous sampling and digital technology, applied in measuring devices, instruments, spectrum analysis, etc., can solve the problem of high development cost, and achieve the effect of good practicability, accurate synchronization and easy realization

Active Publication Date: 2008-07-09
HANGZHOU VANGO TECH
View PDF0 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, software synchronous sampling requires the participation of a microprocessor. In order to improve real-time performance, a high-performance microprocessor must be used to complete the calculations required by the algorithm, so the development cost is also high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital synchronous sampling method
  • Digital synchronous sampling method
  • Digital synchronous sampling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] The specific implementation manner of the method of the present invention will be described in detail below in conjunction with the application of the method in harmonic electric energy metering.

[0034] In harmonic energy measurement, it is necessary to accurately obtain the exact amplitude and phase of the fundamental and harmonic in the power grid. The commonly used method is the fast Fourier transform (hereinafter referred to as FFT). However, under the condition of non-synchronous sampling, FFT calculation will lead to serious frequency leakage, which will reduce the accuracy of fundamental and harmonic energy measurement. Therefore, synchronous sampling is the key to harmonic measurement.

[0035] The structural diagram of the embodiment of the synchronous sampling method applied to harmonic metering in the present invention is shown in Figure 3, wherein the theoretical value f of the grid frequency 0 is 50Hz, assuming the sampling frequency f s It is 50×131072H...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a digital synchronous sampling method, which belongs to the field of D / A mixed signal processing. The method comprises the following steps of: setting a sampling frequency fs to M*N*f0, sampling an input signal with a frequency fi according to the sampling frequency fs, wherein f0 is the frequency theoretical value of the input signal; measuring the frequency of the input signal; and subjecting the sampled signal to lower decimation filtering at a decimation position p and a decimation rate M' by a cascade comb decimation filter manner according to the frequency measurement result to an input signal with a sampling frequency and a frequency of fi after decimation satisfying the synchronous sampling relationship. The invention has the advantages of less calculation amount, easy implementation, accuracy synchronization and good practicality.

Description

technical field [0001] The invention belongs to the field of digital-analog mixed signal processing, in particular to a digital synchronous sampling method. Background technique [0002] Synchronous sampling is the whole cycle, uniform sampling at equal intervals, and the sampling frequency f is required s and the measured signal frequency f i The ratio is an integer multiple of the number of sampling points N in a week. According to different ways of providing sampling signals, synchronous sampling is divided into software synchronous sampling and hardware synchronous sampling. [0003] Hardware synchronous sampling is a special hardware circuit that generates sampling pulses that are synchronous with the signal under test. The traditional approach is to use the phase-locked frequency tracking principle to realize synchronous equal interval sampling, and its circuit is shown in Figure 1. The circuit consists of a phase-locked loop (hereinafter referred to as PLL) compos...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/00G01R23/16
Inventor 王荣华门长有杨昆谭年熊
Owner HANGZHOU VANGO TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com