NDLI: A robust and accurate algorithm for time measurements of periodic signals based on correlation techniques

Content Provider	IEEE Xplore Digital Library
Author	Ho Wai Wong-Lam Naley, M.
Copyright Year	1963
Abstract	Algorithms incorporated in the oscilloscopes allow automatic measurement of periodic waveforms. These algorithms are often based on IEC Standards. They are not only useful for built-in oscilloscope measurements, but also as stand-alone algorithms implemented, for example, on a computer. The conventional algorithms used for time measurement of periodic signals (e.g., period, positive and negative duty cycles and pulse widths) are based on crossings of a reference level. The crossings method for time measurement fails when there are spurious crossings around the reference level. We have developed a robust and accurate algorithm for time measurement of period, duty cycle, and pulse width, based on correlation techniques. The algorithm for determining the period is generic to any periodic waveform with at least one period. The algorithm for duty cycles and pulse widths is only valid for pulse-shaped waveforms. Using example waveforms, our algorithm is shown to produce more robust and accurate time measurements than the built-in algorithm used in a commercial oscilloscope. With modern-day computing power, our algorithm takes between 10 and 20 ms to perform measurements for a waveform of 1000 8-bit data-points on a Pentium III laptop.
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	1181
Ending Page	1189
Page Count	9
File Size	529275
File Format	PDF
ISSN	00189456
Volume Number	50
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Robustness Time measurement Pulse measurements Space vector pulse width modulation Oscilloscopes IEC standards Performance evaluation Instruments Power measurement Portable computers
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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