Page 180 - DCAP303_MULTIMEDIA_SYSTEMS

Multimedia Systems

notes 3. Cropping creates a new image.
( a) True (b) False
10.4 sound editing tools

A Sound editing tools is a computer application for audio editing, i.e. manipulating digital audio.
Digital audio editors are the main software component of a digital audio workstation.
A digital audio editor is defined as a computer application for manipulating digital audio. As
a multimedia creator, we normally use audio editor for recording audio, edit the duration and
timeline, mix multiple sound tracks, apply simple effects for audio enhancement and create
conversion between different audio file formats.
There are countless ways that digital audio editor can be used, and fortunately there are plenty
of good and free digital audio editors out there to help you with your own implementation. So
if you are thinking to purchase a license for Adobe Audition, Cool Edit or Soundforge, hold that
thought first. Not to say they are not cool, but it is always wiser to tryout free applications before
going to the pay deal.
10.4.1 for use with Music

Editors designed for use with music typically allow the user to do the following:
• Record audio from one or more inputs and store recordings in the computer’s memory as
digital audio
• Edit the start time, stop time, and duration of any sound on the audio timeline

• Fade into or out of a clip (e.g. an S-fade out during applause after a performance), or between
clips (e.g. crossfading between takes)
• Mix multiple sound sources/tracks, combine them at various volume levels and pan from
channel to channel to one or more output tracks
• Apply simple or advanced effects or filters, including compression, expansion, flanging,
reverb, audio noise reduction and equalization to change the audio
• Playback sound (often after being mixed) that can be sent to one or more outputs, such as
speakers, additional processors, or a recording medium
• Conversion between different audio file formats, or between different sound quality
levels.

Typically these tasks can be performed in a manner that is both non-linear and non-
destructive.

10.4.2 for use with speech
Editors designed for use in speech research add the ability to make measurements and perform
acoustic analyses such as extracting and displaying a fundamental frequency contour or
spectrogram. They typically lack most or all of the effects of interest to musicians.

10.5 types of sound editing tools

Some of the popular sound editing tools are as follows:
10.5.1 audacity

Audacity is free, open source software for recording and editing sounds. It allows you to record
live audio, converts tapes and records into digital recordings or CDs, edit Ogg Vorbis, mp3, wav

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