Results 1 to 10 of about 6,742,308 (298)

Parameter Estimation Processor for Chirp Signals Based on a Complex-Valued Deep Neural Network

IEEE Access, 2019
This paper addresses the problem of estimating the parameters of constant-amplitude chirp signals that have single or multiple components and are embedded in noise.
Hanning Su, Qinglong Bao, Zengping Chen
doaj   +1 more source

Time-frequency analysis of locally stationary Hawkes processes

, 2017
Locally stationary Hawkes processes have been introduced in order to generalise classical Hawkes processes away from stationarity by allowing for a time-varying second-order structure.
Roueff, François, Von Sachs, Rainer
core  

Time/frequency analysis of contact-friction instabilities. Application to automotive brake squeal. [PDF]

, 2010
Robust design of silent brakes is a current industrial challenge. Braking systems enter in the more general context of unstable systems featuring contact friction interaction.
BALMES, Etienne, LEMAIRE, Rémi, PASQUET, Thierry, VERMOT DES ROCHES, Guillaume   +3 more
core   +2 more sources

Asymptotically Exact Localized Expansions for Signals in Time-Frequency Domain

, 2011
Based on a unique waveform with strong exponential localization property, an exact mathematical method for solving problems in signal analysis in time-frequency domain is presented.
Avanesyan, Gagik T., Muzhikyan, Aramazd H.   +1 more
core   +1 more source

INSTANTANEOUS FREQUENCY ESTIMATION USING A LEAST SQUARES TIME-FREQUENCY METHOD

Electrica, 2004
We present a method for estimating the instantaneous frequency of a signal. This method involves the calculation of a time-frequency energy density of the signal, then obtaining an instantaneous frequency estimation from this joint density.
Mahmut ÖZTÜRK, Aydın AKAN
doaj   +2 more sources

Unraveling cardiac arrhythmia frequency: comparative analysis using time and frequency domain algorithms

Frontiers in Signal Processing
During cardiac arrhythmia, the heart frequency is an important physiological parameter that can be identified by analyzing electrocardiogram (ECG) signals.
Laura Diaz-Maue, Laura Diaz-Maue, Laura Diaz-Maue, Annette Witt, Annette Witt, Lina Elshareif , Holger Nobach   +6 more
doaj   +1 more source

An Efficient Forecasting Approach to Reduce Boundary Effects in Real-Time Time-Frequency Analysis [PDF]

, 2021
Adrien Meynard, Hau‐Tieng Wu
openalex   +1 more source

Experimental Study on Drilling Signal Characteristics of PDC Drill Bit in Media of Different Strengths and Identification of Weak Media

Sensors
This study aimed to investigate the drilling signal characteristics when a PDC drill bit penetrates media of different strengths and to assess the potential of these signals for identifying weak layers within rock formations. Laboratory-scale experiments
Zheng Wu, Yingbo Fan, Huazhou Chen
doaj   +1 more source

Exploring laser-driven quantum phenomena from a time-frequency analysis perspective: A comprehensive study

, 2015
Time-frequency (TF) analysis is a powerful tool for exploring ultrafast dynamics in atoms and molecules. While some TF methods have demonstrated their usefulness and potential in several of quantum systems, a systematic comparison among these methods is ...
Hsu, Liang-Yan, Sheu, Yae-lin, Wu, Hau-tieng   +2 more
core   +1 more source

Classification of Multiple Partial Discharge Sources Using Time-Frequency Analysis and Deep Learning

Applied Sciences
Partial discharge (PD) analysis is critical for diagnosing insulation degradation in high-voltage equipment. While conventional methods struggle with multi-source PD classification due to signal overlap and noise, this study proposes a hybrid approach ...
Awad Almehdhar, Radek Prochazka
doaj   +1 more source