audio codec

(redirected from audio coder)

audio codec

(1) (audio enCOder/DECoder) Software that compresses and decompresses a digital audio signal. MP3, Windows Media Audio (WMA), Dolby Digital and DTS are examples of popular codecs that compress and decompress digital audio. The audio codec may also be a hardware circuit. See codec examples, codec, Windows Media formats, QuickTime, audio compression, perceptual audio coding and G. standards.

(2) (audio enCOder/DECoder) A hardware circuit that converts sound waves into PCM digital code and vice versa. The term may refer to only the A/D and D/A conversion, or it may include the compression technique for further reducing the signal (definition #1 above). If the codec is specialized for human voice, it is known as a "speech codec," "voice codec" or "vocoder" (see speech codec). See sampling and codec.
References in periodicals archive ?
AT&T Labs' Perceptual Soundfield Reconstruction technology was invented by James Johnston, technology leader and psychoacoustics expert at AT&T Labs and co-developer of AAC (Advanced Audio Coding) or MPEG-2 Audio-AAC, a substantially better audio coder than MP3.
ClickRadio Inc has licensed Lucent Technologies' Enhanced Perceptual Audio Coder (ePAC) for use in its Internet-based digital radio service which is expected to launch later this month.
Lucent Technologies Inc has licensed its Bell Labs-developed Enhanced Perceptual Audio Coder (ePAC) internet audio compression algorithm to Lydstrom Inc and e.
The PAC coder also offers XM's receiver manufacturing partners the industry-leading digital audio coder.
Digital plans to manufacture, will use the Lucent Enhanced Perceptual Audio Coder (EPAC) and a new class of digital signal processors (DSPs) made by Texas Instruments Inc.
Dolby will demonstrate Advanced Audio Coding (AAC), which is a next-generation perceptual audio coder that uses advanced signal processing techniques and psycho-acoustic models to faithfully reproduce audio recordings at ultra-low data rates.
AAC is the latest audio coder standardized by the International Organization for Standardization (ISO) as part of the MPEG specification.
Campbell recently left Lucent where he had been directing their efforts for its Internet audio compression format, Enhanced Perceptual Audio Coder (ePAC)(TM).
Lucent Technologies' famed research and development arm, Bell Labs, has been at the forefront of technology for the music industry for decades, with the introduction of sound for motion pictures in 1926; the invention of stereo recording in 1933; the invention of the transistor in 1947; the introduction of computer-synthesized music in the 1950s; the introduction of psychoacoustics in the 1960s; sub-band coding of audio in the 1970s; the introduction of linear predictive coding in the 1980s, and the Perceptual Audio Coder in the 1990s.
AAC is the latest audio coder standardized by the International Standards Organization (ISO) as part of the MPEG specification.
The combined solution enables music labels to encode their releases with ePAC, the highest-quality audio coder in the industry, and ensure secure distribution to Internet listeners.
The patent, entitled "Vector Excitation Speech or Audio Coder for Transmission or Storage," covers the coding of speech using a technique which dramatically increases speech quality yet is less complex than previous techniques by a substantial margin.