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5,551
Time-Varying Frequency Warping: Results and Experiments
"... Dispersive tapped delay lines are attractive structures for altering the frequency content of a signal. In previous papers we showed that in the case of a homogeneous line with first order all-pass sections the signal formed by the output samples of the chain of delays at a given time is equivalent ..."
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Cited by 2 (1 self)
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to compute the Laguerre transform of the input signal. However, most musical signals require a time-varying frequency modification in order to be properly processed. Vibrato in musical instruments or voice intonation in the case of vocal sounds may be modeled as small and slow pitch variations. Simulations
Audio Effects Based on Biorthogonal Time-Varying Frequency Warping
- EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING 2001:1, 27–35 © 2001 HINDAWI PUBLISHING CORPORATION
, 2001
"... We illustrate the mathematical background and musical use of a class of audio effects based on frequency warping. These effects alter the frequency content of a signal via spectral mapping. They can be implemented in dispersive tapped delay lines based on a chain of all-pass filters. In a homogeneou ..."
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Cited by 3 (3 self)
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homogeneous line with first-order all-pass sections, the signal formed by the output samples at a given time is related to the input via the Laguerre transform. However, most musical signals require a time-varying frequency modification in order to be properly processed. Vibrato in musical instruments
A Fuzzy Predictive Filter for Sinusoidal Signals with Time-Varying Frequencies
"... Abstract�Prediction of sinusoidal signals with time-varying frequencies has been an important research topic in power electronics systems. To solve this problem, we propose a new fuzzy predictive filtering scheme, which is based on a Finite Impulse Response (FIR) filter bank. Fuzzy logic is introduc ..."
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Abstract�Prediction of sinusoidal signals with time-varying frequencies has been an important research topic in power electronics systems. To solve this problem, we propose a new fuzzy predictive filtering scheme, which is based on a Finite Impulse Response (FIR) filter bank. Fuzzy logic
An Efficient Diversity Exploitation in Multiuser Time-Varying Frequency-Selective Fading Channels
- IEEE Trans. Commun
, 2011
"... Abstract—Diversity exploitation is a proven efficient means for addressing detrimental effects of wireless channel fadings. User channelization, where the frequency and time resources are structured into several user channels, can substantially help to capture the diversity, but it has not been well ..."
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Cited by 2 (2 self)
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well investigated. In this paper, we develop theoretical formulation of optimal resource structures under different performance metrics and then analyze them in frequency-selective time-varying channels. We propose asimplified system model which maintains the main features, and based on which, we
Iterative channel estimation for turbo equalization of time-varying frequency-selective channels
- IEEE Trans. Wireless Commun
, 2004
"... Abstract—We investigate turbo equalization, or iterative equalization and decoding, as a receiver technology for systems where data is protected by an error-correcting code, shuffled by an interleaver, and mapped onto a signal constellation for transmission over a frequency-selective channel with un ..."
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Cited by 41 (1 self)
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with unknown time-varying channel impulse response. The focus is the concept of soft iterative channel estimation, which is to improve the channel estimate over the iterations by using soft information fed back from the decoder from the previous iteration to generate “extended training sequences ” between
Time-Varying, Frequency-Domain Modeling and Analysis of Phase-Locked
, 2003
"... This paper presents a new, frequency-domain based method for modeling and analysis of phase-locked loop (PLL) small-signal behavior, including time-varying aspects. Focus is given to PLLs with sampling phasefrequency detectors (PFDs) which compute the phase error only once per period of the referenc ..."
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This paper presents a new, frequency-domain based method for modeling and analysis of phase-locked loop (PLL) small-signal behavior, including time-varying aspects. Focus is given to PLLs with sampling phasefrequency detectors (PFDs) which compute the phase error only once per period
An adaptive decision feedback equalizer for time-varying frequency selective MIMO channels
- in Proc. IEEE Workshop on Signal Processing Advances in Wireless Communications
, 2006
"... Abstract — A new adaptive equalizer for wireless systems operating over time-varying and frequency selective multiple-input multiple-output (MIMO) channels is proposed. The equalizer consists of a number of decision feedback equalizer (DFE) stages, each one detecting a single stream. The equalizer f ..."
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Cited by 2 (2 self)
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Abstract — A new adaptive equalizer for wireless systems operating over time-varying and frequency selective multiple-input multiple-output (MIMO) channels is proposed. The equalizer consists of a number of decision feedback equalizer (DFE) stages, each one detecting a single stream. The equalizer
A Robust Detector for Time-Varying, Frequency-Flat, Rayleigh Fading Channels
"... A receiver structure for unknown timevarying, frequency-flat, Rayleigh fading channels is proposed. Unlike the maximum likelihood receiver structure, this receiver structure does not need any knowledge of the channel autocovariance or the received signal-to-noise ratio, and yet it achieves performan ..."
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A receiver structure for unknown timevarying, frequency-flat, Rayleigh fading channels is proposed. Unlike the maximum likelihood receiver structure, this receiver structure does not need any knowledge of the channel autocovariance or the received signal-to-noise ratio, and yet it achieves
Prediction of spectral shifts proportional to source distances by time-varying frequency
, 812
"... or wavelength selection ..."
Analysis of heart rate variability using time-varying frequency bands based on respiratory frequency
- Proc. of the EMBS-IEEE
"... Abstract — In this paper a methodological approach for the analysis of nonstationary heart rate variability (HRV) signals using time-varying frequency bands based on respiratory fre-quency is presented. Spectral analysis of HRV is accomplished by means of the Smoothed Pseudo Wigner Ville distributio ..."
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Cited by 3 (1 self)
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Abstract — In this paper a methodological approach for the analysis of nonstationary heart rate variability (HRV) signals using time-varying frequency bands based on respiratory fre-quency is presented. Spectral analysis of HRV is accomplished by means of the Smoothed Pseudo Wigner Ville
Results 1 - 10
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5,551
