7,288 research outputs found
Delay Estimation from noisy time series
We propose here a method to estimate a delay from a time series taking
advantage of analysis of random walks with delay. This method is applicable to
a time series coming out of a system which is or can be approximated as a
linear feedback system with delay and noise. We successfully test the method
with a time series generated by discrete Langevin equation with delay.Comment: Tentatively scheduled to appear as a Rapid Communication in Phys.
Rev. E., March 199
Compressive Time Delay Estimation Using Interpolation
Time delay estimation has long been an active area of research. In this work,
we show that compressive sensing with interpolation may be used to achieve good
estimation precision while lowering the sampling frequency. We propose an
Interpolating Band-Excluded Orthogonal Matching Pursuit algorithm that uses one
of two interpolation functions to estimate the time delay parameter. The
numerical results show that interpolation improves estimation precision and
that compressive sensing provides an elegant tradeoff that may lower the
required sampling frequency while still attaining a desired estimation
performance.Comment: 5 pages, 2 figures, technical report supporting 1 page submission for
GlobalSIP 201
Start-up delay Estimation at Signalized Intersections: Impact of Left-Turn Phasing Sequences
This paper aims to investigate the start-up delay at signalized intersections in Abu Dhabi (AD) city, UAE. Impact of external factors that may affect the start-up delay is examined including left turn phasing sequences (split/lead/lag), movement turning (through/left), intersection location (CBD/non-CBD) and day time (peak/off-peak). A new technique of data collection was applied based on the automate records of license plate of vehicles and a comparison with the traditional video recorded technique was carried out. Data covered 66 approaches of 36 signalized intersections. The analysis showed that overall estimated mean value of the start-up delay is 2.201 sec. with a standard deviation of 1.823 sec. The t-test shows significant statistical difference in start-up delay between observations at through and left movements, at CDB and non-CDB area and at split and lead/lag phasing. However, no significant differences were found between peak and off-peak periods and between split and lead phasing. In general, lead/lag phasing sequences not only improved the overall delay at signalized intersection but also improved the start-up delay.nbsp nbs
Inter-sensor propagation delay estimation using sources of opportunity
Propagation delays are intensively used for Structural Health Monitoring or
Sensor Network Localization. In this paper, we study the performances of
acoustic propagation delay estimation between two sensors, using sources of
opportunity only. Such sources are defined as being uncontrolled by the user
(activation time, location, spectral content in time and space), thus
preventing the direct estimation with classical active approaches, such as
TDOA, RSSI and AOA. Observation models are extended from the literature to
account for the spectral characteristics of the sources in this passive context
and we show how time-filtered sources of opportunity impact the retrieval of
the propagation delay between two sensors. A geometrical analogy is then
proposed that leads to a lower bound on the variance of the propagation delay
estimation that accounts for both the temporal and the spatial properties of
the sources field
Automotive three-microphone voice activity detector and noise-canceller
This paper addresses issues in improving hands-free speech recognition performance in car
environments. A three-microphone array has been used to form a beamformer with leastmean
squares (LMS) to improve Signal to Noise Ratio (SNR). A three-microphone array
has been paralleled to a Voice Activity Detection (VAD). The VAD uses time-delay
estimation together with magnitude-squared coherence (MSC)
PERFORMANCE ANALYSIS AND PLAYOUT TIME ESTIMATION FOR MULTIMEDIA OVER INTERNET PROTOCOL (MOIP)
This thesis presents the algorithms to estimate the minimum buffering delay and playout delay. The possibility to use the buffering delay estimation in Multimedia Application at the receiver site will reduce the effect of jitter and will also optimize the packet loss. The increasing of Traffic of loaded generator will influence the network behaviour and affect to transmission data using video conferencing netmeeting application over the network connectio
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