man scale (1): Scale the amplitude of a sound file. .

DESCRIPTION

Takes a sound file and scales it by applying a gain, either constant or variable. The scale can be specified as a multiplier, a maximum or a percentage of 0db.

SYNTAX

scale [OPTIONS ... ] infile

INITIALIZATION

Flags:

: • -A = Generate an AIFF outout file.

: • -W = Generate an WAV outout file.

: • -h = Generate an outout file with no header.

: • -c = Generate 8-bit signed_char sound samples.

: • -a = Generate alaw sound samples.

: • -u = Generate ulaw sound samples.

: • -s = Generate short integer sound samples.

: • -l = Generate long (32 bit) integer sound samples.

: • -f = Generate floating point samples.

: • -F arg = Specifies the gain to be applied. If arg is a floating point number that gain is applied uniformly to the input. Alternatively it could be a file name which specifies a breakpoint file for varying the gain for different periods.

: • -M fpnum = Scales the input so the maximum absolute displacement is the value given.

: • -P fpnum = Scales the input so the maximum absolute displacement is the pencentage given of 0db.

: • -R = Continually rewrite the header while writing soundfile (WAV/AIFF).

: • -H integer = Show a "heart-beat" to indicate progress, in style 1, 2 or 3.

: • -N = Alert call (usually ringing the bell) when finished.

: • -o fname = output file name (default: test.wav)

EXAMPLES

    scale -s -W -F 0.96 -o out.wav sound.wav

This creates a new sound file with a constant gain of 0.96. It is particularly useful if the input file is in floating point format.

CREDITS

Author: John ffitch

1994

AUTHORS

Barry Vercoe
MIT Media Lab

: Author.

Dan Ellis
MIT Media Lab,
          Cambridge
          Massachussetts

: Author.