scholarly journals High-Precision Frequency Measurement Using Digital Signal Processing

10.5772/25683 ◽  
2011 ◽  
Author(s):  
Ya Liu ◽  
Xiao Hui ◽  
Wen Li
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
High Precision ◽  
Digital Signal ◽  
Frequency Measurement ◽  
Precision Frequency

Measuring System for Pipe-Flow Based on the Doppler Method

2014 ◽  
Vol 898 ◽  
pp. 606-609
Author(s):  
Yun Lin ◽  
Miao Cao ◽  
Zhi Yong An
Keyword(s):  
Signal Processing ◽  
Fluid Flow ◽  
Digital Signal Processing ◽  
High Precision ◽  
Pipe Flow ◽  
Flow Measurement ◽  
Digital Signal ◽  
Processing Technology ◽  
Measuring System ◽  
Doppler Method

This measuring system is designed to improve the accuracy of the pipe-flow measurement based on the Doppler method. It uses plane concave sound lens to converge the ultrasonic sending and receiving beam, reduce the volume of the Doppler information window and realize the measurement of fluid flow in pipe with the Doppler method. With the application of DSP digital signal processing technology to design this flow measuring system, it achieves accurate measurement of fluid flow in pipe. Experimentation proves that the measuring accuracy of the system is higher than 1%.It is of great significance to realize high precision of pipe-flow measurement based on the Doppler method.

Method of estimation of hidden correlation of narrowband noise signals

2019 ◽  
pp. 34-39 ◽  
Author(s):  
E.I. Chernov ◽  
N.E. Sobolev ◽  
A.A. Bondarchuk ◽  
L.E. Aristarhova
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
New Technology ◽  
Digital Signal ◽  
Measuring Instruments ◽  
Central Frequency ◽  
Pearson Criterion ◽  
Useful Signal ◽  
Band Limited ◽  
Narrowband Noise

The concept of hidden correlation of noise signals is introduced. The existence of a hidden correlation between narrowband noise signals isolated simultaneously from broadband band-limited noise is theoretically proved. A method for estimating the latent correlation of narrowband noise signals has been developed and experimentally investigated. As a result of the experiment, where a time frag ent of band-limited noise, the basis of which is shot noise, is used as the studied signal, it is established: when applying the Pearson criterion, there is practically no correlation between the signal at the Central frequency and the sum of signals at mirror frequencies; when applying the proposed method for the analysis of the same signals, a strong hidden correlation is found. The proposed method is useful for researchers, engineers and metrologists engaged in digital signal processing, as well as developers of measuring instruments using a new technology for isolating a useful signal from noise – the method of mirror noise images.

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