digital audio

(redirected from waveform audio)

digital audio

(multimedia, file format)
A sequence of discrete samples taken from a continuous sound (audio) waveform. Tens of thousands of samples are taken each second. Each sample represents the intensity of the sound pressure wave at that instant. Apart from the sampling frequency, the other parameter is the digital encoding of each sample including the number of bits used. The encoding may be linear, logarithmic or mu-law.

Digital audio is typically created by taking 16-bit samples over a spectrum of 44.1 thousand cycles per second (kHz), this means that CD quality sound requires 1.4 million bits of data per second. Digital telephone systems use lower sample rates.

Filename extension: .au (Unix), .snd (MS-DOS, MS Windows).

See also Audio IFF, MP3, wav.

Usenet newsgroups: alt.binaries.sounds.*.

A FAQ on audio file formats is available. Part 1, Part 2.

digital audio

(1) Sound waves that have been sampled, digitized and stored in the computer. Common formats are music CDs, MP3, WAV and AIFF, and software-based players play the largest variety of audio formats (see media player).

Musical Instrument Digital Interface (MIDI)
Although digital, the MIDI format differs from all other digital audio formats. MIDI files contain a coded version of the musical score, not the actual sound (see MIDI). Contrast with analog audio. See CD-DA, MP3, codec examples and S/PDIF.

(2) Broadcast radio in digital format. See HD Radio, DAB and satellite radio.

(3) See digital CD audio.
References in periodicals archive ?
Waveform audio data (WAV files) can be recorded, edited, mixed and manipulated then combined with MIDI files using a "start-stop" feature.
Even as far back as 1983, Apple saw the potential of digital audio and incorporated waveform audio features into the earliest Macs.
Studio (now Windows 95-compliant) is an easy and versatile way to record, edit, arrange and print music that consists of both MIDI (Musical Instrument Digital Interface) and waveform audio (.
The new version of Studio offers the capability to record and edit waveform audio tracks.
The two most important new features in Recording Session Plus are: waveform audio (.
New waveform audio capabilities give the user the ability to easily record vocals, sound effects and acoustic instruments digitally with a standard microphone, and then integrate this digital audio along with MIDI tracks to create a song.