Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comparison of Signals from Gravitational Wave Detectors with
  Instantaneous Time-Frequency Maps   Gravitational wave astronomy relies on the use of multiple detectors, so that
coincident detections may distinguish real signals from instrumental artifacts,
and also so that relative timing of signals can provide the sky position of
sources. We show that the comparison of instantaneous time-frequency and time-
amplitude maps provided by the Hilbert-Huang Transform (HHT) can be used
effectively for relative signal timing of common signals, to discriminate
between the case of identical coincident signals and random noise coincidences,
and to provide a classification of signals based on their time-frequency
trajectories. The comparison is done with a chi-square goodness-of-fit method
which includes contributions from both the instantaneous amplitude and
frequency components of the HHT to match two signals in the time domain. This
approach naturally allows the analysis of waveforms with strong frequency
modulation.

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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
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The categories of this paper are: math-ph