Results 261 to 270 of about 4,476,448 (287)

Instantaneous frequency estimation by the reassigned Stockwell spectrogram

2012 11th International Conference on Information Science, Signal Processing and their Applications (ISSPA), 2012
The Stockwell transform, a mix of the short-time Fourier transform and the wavelet transform, has been widely used in practice in the last decade due to its easily interpretable andmulti-resolution time-frequency characteristics. In this paper, we introduce the reassigned Stockwell spectrogram by re-mapping the surface of the spectrogram of the Stock ...
Cheng Liu, Hongmei Zhu
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Estimation of Instantaneous Frequency and Instantaneous Bandwidth via Adaptive Signal Decomposition

2006 IEEE International Conference on Acoustics Speed and Signal Processing Proceedings, 2006
In this work, we derive general formulae for the instantaneous frequency (IF) and instantaneous bandwidth (IB) according to matching pursuit (MP) signal decomposition, irrespective of the kind of dictionary used. We show that via MP decomposition, the IF is now exactly the weighted average IF of the decomposed signal and that it is also always real ...
Sedigheh Ghofrani, Desmond C. McLernon, Ahmad Ayatollahi   +2 more
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Fundamental frequency estimation based on instantaneous frequency amplitude spectrum

IEEE International Conference on Acoustics Speech and Signal Processing, 2002
This paper describes a technique for estimating fundamental frequency of speech based on instantaneous frequency (IF). In the technique, fundamental frequency of a signal is obtained by evaluating its IF amplitude spectrum. We define a measure which represents how clearly the harmonic structure is shown in the IF amplitude spectrum.
Tomohiro Tanaka, Takao Kobayashi, Dhany Arifianto, Takashi Masuko   +3 more
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Performance of quadratic time~frequency distributions as instantaneous frequency estimators

IEEE Transactions on Signal Processing, 2003
General performance analysis of the shift covariant class of quadratic time-frequency distributions (TFDs) as instantaneous frequency (IF) estimators, for an arbitrary frequency-modulated (FM) signal, is presented. Expressions for the estimation bias and variance are derived.
Veselin N. Ivanovic, Milos Dakovic, Ljubisa Stankovic   +2 more
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Structured autoregressive instantaneous phase and frequency estimation

1995 International Conference on Acoustics, Speech, and Signal Processing, 2002
A new approach to estimate the phase and amplitude signal parameters of a quite general class of complex valued signals is presented. The proposed algorithm can estimate the signal parameters of a sum of complex signals, the amplitudes may be time varying and the phase functions are modelled by some continuous functions a/sub l/(t).
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A practical procedure for estimation of instantaneous frequency

IEEE Transactions on Instrumentation and Measurement, 1981
The instantaneous frequency of a frequency-modulated signal may be estimated using the zero crossings of the signal. Furthermore, the procedure is simple and gives good results when only samples of the signals are available and when the signal-to-noise ratio is above about 12 dB. An example is given.
Richard G. Wiley, William R. Carmichael
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A Robust Instantaneous Frequency Estimation Method

Proceedings, 2011
As the instantaneous frequency (IF) estimation using the traditional Hilbert transform (HT) is susceptible to noise, we propose a robust IF estimation method in this paper. The main procedure of the proposed method is applying a geometric series filter to the windowed signal to get the analytic signal. Experimental results on synthetic signals and real
W. Lu, C. K. Zhang
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Instantaneous Frequency Estimation Using Aggregate Spectrogram

2007
The are various definitions of instantaneous frequency (IF) but most of them have short comings. The most popular of these definitions, is the one given by Cohen. To estimate IF accuratly, techniques become more and more complex. This paper introduces the idea of aggregate spectrogram (AS).
Khalid Mahmood Aamir, Arif Zaman, Mohammad Ali Maud, Asim Loan   +3 more
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Anelastic Absorption Estimation by Instantaneous Frequency

Proceedings, 2015
The instantaneous frequency is the barycenter of the instantaneous spectrum, and it may provide high-resolution information about the anelastic absorption. This seismic attribute is normally computed by the derivative of the instantaneous phase, but is spiky and unstable when the phase unwrapping process fails.
A.L. Vesnaver, E. Poggiagliolmi
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Application of instantaneous frequency estimation for fundamental frequency detection

Proceedings of IEEE-SP International Symposium on Time- Frequency and Time-Scale Analysis, 2002
Speech signals are nonstationary processes in nature. To represent the nonstationarity, time-frequency analysis techniques are suitable tools since they represent signals simultaneously in both time and frequency. In this paper, the instantaneous frequency (IF) technique is used for fundamental frequency estimation.
null Haiyun Yang, null Lunji Qui, null Soo-Ngee Koh   +2 more
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