Table of Contents
QccPackSQ - QccPack module for scalar quantization
QccPackSQ
provides a collection of library routines and utility programs for scalar
quantization.
- no documentation at this time -
- squniform(1)
- make uniform scalar quantizer
- sqlloyd(1)
- design
Lloyd optimal mean-square scalar quantizer for Gaussian and Laplacian
densities
- sqencode(1)
- encoding using scalar quantization
- sqdecode(1)
- scalar-quantization decoding
In general, each file format
starts with an ASCII header followed by ASCII or binary data. The ASCII
header starts with a magic number, and can be followed with any amount
of white space (blanks, `\t' (tab), `\n' (newline), `\r' (carriage return)) and/or
comments lines (lines starting with "#"). Following this white space,
each format has a varying amount of header information in ASCII. This ASCII
header information is separated by blanks and newlines. The data follows
this ASCII header information. The data is in binary, and one (and only
one) newline must immediately follow the last component of ASCII header
information.
- SQ - scalar-quantizer format
-
SQX.X
<white space>
<type>
<data>...
where SQ is the magic number,
X.X is the revision number, <white space> is white space and/or comment
lines, and <type> is an ASCII integer specifying one three possible formats.
For the general scalar quantizer (<type> = 0), <data> is of the following
form:
N
l1 l2 l3...
p1 p2 p3...
b1 b2 b3...
.
.
.
where N is the number of reproduction
levels the file contains, li are the reproduction levels, pi are the level
probabilities, and bi are the boundaries between reproduction levels. N
is an ASCII integer; li, pi, and bi are doubles, stored as binary (4
bytes, MSB first). The files contains N values each for li and pi; the
file contains N - 1 bi values.
For the uniform quantizer, (<type> = 1),
<data> is a single double value stored as binary giving the stepsize of
the uniform scalar quantizer.
For the deadzone quantizer, (<type> = 2),
<data> is a double value stored as binary giving the stepsize of the uniform
scalar quantizer, followed by another double giving the size of the deadzone.
squniform(1)
, sqlloyd(1)
, sqencode(1)
, sqdecode(1)
, QccPackENT(3)
,
QccPackVQ(3)
, QccPackAVQ(3)
, QccPackIMG(3)
, QccPackWAV(3)
, QccPack(3)
Copyright (C) 1997-2021 James E. Fowler
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