Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectrometers and Polyphase Filterbanks in Radio Astronomy   This review gives an introduction to spectrometers and discusses their use
within radio astronomy. While a variety of technologies are introduced,
particular emphasis is given to digital systems. Three different types of
digital spectrometers are discussed: autocorrelation spectrometers, Fourier
transform spectrometers, and polyphase filterbank spectrometers. Given their
growing ubiquity and significant advantages, polyphase filterbanks are detailed
at length. The relative advantages and disadvantages of different spectrometer
technologies are compared and contrasted, and implementation considerations are
presented.

17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org