digital audio

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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 ?
With Cypress's patent-pending clock synchronization and recovery scheme, PSoC 3 ensures no samples are dropped, delivering the highest quality digital audio with minimal external components at multiple audio sample rates (at standard intervals up to 24-bit audio, 48-kHz sampling rate).
In addition to listening to audio samples, Songfreedom's site allows all users to filter, sort and search products by song attributes, such as tempo, length, rating and event genre to allow them to even more effectively match the track with a project.
In an interactive multimedia simulation, audio samples were provided in various user scenarios, including both 'standard' quality and Siemens Enterprise Communications' AudioPresence[sup.
com is joining the mobile revolution with its own app to showcase its roster of over 25,000 voice over talents by making MP3 audio samples available with the touch of a finger.
The new version also addresses the analog sunset directive, and describes a protocol for the transmission of audio and music data over IEEE Std 1394-1995 or later, including the transport of IEC 60958 digital format, raw audio samples, and MIDI data.
From press listings to photos to audio samples to reviews from previous clients, it's all there.
For more information, including audio samples, visit http://www.
The test, coordinated by Sebastian Mares and presented on a Hydrogenaudio online forum, consisted of twenty audio samples featuring a variety of voice types, tempos, instruments, and music genres.
Incorporating a database of hundreds of thousands of high-quality audio samples, users are able to personalize their songs in real-time using pre-recorded audio samples produced by some of the top professional vocalists in the Los Angeles area.
Voiceprints are not audio samples, but a matrix of numbers that measure behavioral characteristics of the way the person speaks, as well as physical characteristics of the person's vocal tract.
The software provides a detailed description of each business idiom including several examples, a pronunciation guide and audio samples.