COMPAND

NAME

compand -- compand (compress dynamic range) speech signals

SYNOPSIS

compand (-r dbrange) (-c mu-value) (-i item) file

DESCRIPTION

compand is a program to demonstrate the effects of dynamic range compression on speech signals. The normal dynamic range of a 16-bit signal (90dB) can be compressed by non-linear amplitude mapping either (i) to a smaller dynamic range, or (ii) to a mu-law compression function: outmag = log(1+mu*inpmag)/log(1+mu).

Options and their meanings are:

-I Identify program and exit.

-i item Select input item.

-r dbrange Select dynamic range compression. Default 90dB. Maximum 90dB. -c mu-value Select mu-law compression. Mild compression mu=10. Strong compression mu=100.

INPUT ITEMS

1.xx Any speech item.

OUTPUT ITEMS

SPEECH Companded signal.

HISTORY

dbrange= Output dynamic range.

mu= Mu-law compression value.

VERSION/AUTHOR

1.1 - Mark Huckvale.
Fri Jul 09 14:54:37 2004