Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Joint Time--Frequency Analysis: a tool for exploratory analysis and
  filtering of non-stationary time series   It is the purpose of the paper to describe the virtues of time-frequency
methods for signal processing applications, having astronomical time series in
mind. Different methods are considered and their potential usefulness
respectively drawbacks are discussed and illustrated by examples. As areas
where one can hope for a successful application of joint time-frequency
analysis (JTFA), we describe specifically the problem of signal denoising as
well as the question of signal separation which allows to separate signals
(possibly overlapping in time or frequency, but) which are living on disjoint
parts of the time-frequency plane. Some recipes for practical use of the
algorithms are also provided.

18
The categories of this paper are: econ
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs