Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: C Implementation & comparison of companding & silence audio compression
  techniques   Just about all the newest living room audio-video electronics and PC
multimedia products being designed today will incorporate some form of
compressed digitized-audio processing capability. Audio compression reduces the
bit rate required to represent an analog audio signal while maintaining the
perceived audio quality. Discarding inaudible data reduces the storage,
transmission and compute requirements of handling high-quality audio files.
This paper covers wave audio file format & algorithm of silence compression
method and companding method to compress and decompress wave audio file. Then
it compares the result of these two methods.

8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math