addnoise: Manual Page

ADDNOISE

NAME

addnoise - add noise to speech signal

SYNOPSIS

addnoise (-w|-p) (-a dblevel|-r dblevel) (-n) (-t threshdb) file

DESCRIPTION

addnoise is a program to add noise to a signal and to control the absolute signal level or signal-to-noise ratio. Options control whether white noise or pink noise is added and whether the final result is normalised to a standard level.

OPTIONS

-I Identify program name and version number.

-i item Select input item number.

-w Select white noise (default).

-p Select pink-noise.

-a dblevel Specify level of noise in absolute terms with respect to maximum level signal.

-r dblevel Specify level of noise in relative terms with respect to the level of the input signal.

-n Specify that the resulting signal should be normalised to -18dB absolute.

-t threshold Specifies the relative signal level to be considered silence and ignored in SNR calculations. Default is 50dB.

INPUT ITEMS

SP Input speech signal.

OUTPUT ITEMS

SP Signal with added noise

HISTORY

type Noise type.

abs Absolute noise level.

SNR Signal to noise ratio.

norm Normalised.

thresh Silence threshold.

VERSION/AUTHOR

1.0 Mark Huckvale

BUGS

_{Fri Jul 09 14:54:41 2004}