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CELT, the Glossary

Constrained Energy Lapped Transform (CELT) is an open, royalty-free lossy audio compression format and a free software codec with especially low algorithmic delay for use in low-latency audio communication.^[1]

67 relations: Advanced Audio Coding, Audio codec, Broadcom, BSD licenses, C (programming language), Chris Montgomery, Code-excited linear prediction, Comfort noise, Comparison of audio coding formats, Compression artifact, Constant bitrate, Counter-Strike: Global Offensive, Critical band, Data compression, Data reduction, Delta encoding, Dota 2, Ekiga, Entropy coding, FFmpeg, Free software, FreeSWITCH, Frequency domain, GStreamer, Hearing range, High-Efficiency Advanced Audio Coding, Intellectual property, Internet Engineering Task Force, Intra-frame coding, JACK Audio Connection Kit, Jami (software), Joint encoding, Latency (engineering), Library (computing), Linear prediction, Lossy compression, Modified discrete cosine transform, MP3, Mumble (software), Ogg, Opus (audio format), Overlap–add method, Packet loss concealment, Pulse-code modulation, Pyramid vector quantization, Quantization (signal processing), Range coding, Real-time Transport Protocol, Reference implementation, Royalty-free, ... Expand index (17 more) »
Free audio codecs
Xiph.Org projects

Advanced Audio Coding

Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression.

See CELT and Advanced Audio Coding

Audio codec

An audio codec, or audio decoder is a device or computer program capable of encoding or decoding a digital data stream (a codec) that encodes or decodes audio.

See CELT and Audio codec

Broadcom

Broadcom Inc. is an American multinational designer, developer, manufacturer, and global supplier of a wide range of semiconductor and infrastructure software products. Broadcom's product offerings serve the data center, networking, software, broadband, wireless, storage, and industrial markets.

See CELT and Broadcom

BSD licenses

BSD licenses are a family of permissive free software licenses, imposing minimal restrictions on the use and distribution of covered software.

See CELT and BSD licenses

C (programming language)

C (pronounced – like the letter c) is a general-purpose programming language.

See CELT and C (programming language)

Chris Montgomery

Christopher "Monty" Montgomery (born June 6, 1972) is an American programmer and engineer. CELT and Chris Montgomery are Xiph.Org projects.

See CELT and Chris Montgomery

Code-excited linear prediction

Code-excited linear prediction (CELP) is a linear predictive speech coding algorithm originally proposed by Manfred R. Schroeder and Bishnu S. Atal in 1985. CELT and code-excited linear prediction are speech codecs.

See CELT and Code-excited linear prediction

Comfort noise

Comfort noise (or comfort tone) is synthetic background noise used in radio and wireless communications to fill the artificial silence in a transmission resulting from voice activity detection or from the audio clarity of modern digital lines.

See CELT and Comfort noise

Comparison of audio coding formats

The following tables compare general and technical information for a variety of audio coding formats.

See CELT and Comparison of audio coding formats

Compression artifact

A compression artifact (or artefact) is a noticeable distortion of media (including images, audio, and video) caused by the application of lossy compression.

See CELT and Compression artifact

Constant bitrate

Constant bitrate (CBR) is a term used in telecommunications, relating to the quality of service.

See CELT and Constant bitrate

Counter-Strike: Global Offensive

Counter-Strike: Global Offensive (CS:GO) is a 2012 multiplayer tactical first-person shooter developed by Valve and Hidden Path Entertainment.

See CELT and Counter-Strike: Global Offensive

Critical band

In audiology and psychoacoustics the concept of critical bands, introduced by Harvey Fletcher in 1933 and refined in 1940, describes the frequency bandwidth of the "auditory filter" created by the cochlea, the sense organ of hearing within the inner ear.

See CELT and Critical band

Data compression

In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation.

See CELT and Data compression

Data reduction

Data reduction is the transformation of numerical or alphabetical digital information derived empirically or experimentally into a corrected, ordered, and simplified form.

See CELT and Data reduction

Delta encoding

Delta encoding is a way of storing or transmitting data in the form of differences (deltas) between sequential data rather than complete files; more generally this is known as data differencing.

See CELT and Delta encoding

Dota 2

Dota 2 is a 2013 multiplayer online battle arena (MOBA) video game by Valve.

See CELT and Dota 2

Ekiga

Ekiga (formerly called GnomeMeeting) was a VoIP and video conferencing application for GNOME and Microsoft Windows.

See CELT and Ekiga

Entropy coding

In information theory, an entropy coding (or entropy encoding) is any lossless data compression method that attempts to approach the lower bound declared by Shannon's source coding theorem, which states that any lossless data compression method must have an expected code length greater than or equal to the entropy of the source.

See CELT and Entropy coding

FFmpeg

FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files and streams.

See CELT and FFmpeg

Free software

Free software, libre software, libreware or rarely known as freedom-respecting software is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions.

See CELT and Free software

FreeSWITCH

FreeSWITCH is a free and open-source telephony software for real-time communication protocols using audio, video, text and other forms of media.

See CELT and FreeSWITCH

Frequency domain

In mathematics, physics, electronics, control systems engineering, and statistics, the frequency domain refers to the analysis of mathematical functions or signals with respect to frequency (and possibly phase), rather than time, as in time series.

See CELT and Frequency domain

GStreamer

GStreamer is a pipeline-based multimedia framework that links together a wide variety of media processing systems to complete complex workflows.

See CELT and GStreamer

Hearing range

Hearing range describes the frequency range that can be heard by humans or other animals, though it can also refer to the range of levels.

See CELT and Hearing range

High-Efficiency Advanced Audio Coding

High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio defined as an MPEG-4 Audio profile in ISO/IEC 14496–3.

See CELT and High-Efficiency Advanced Audio Coding

Intellectual property

Intellectual property (IP) is a category of property that includes intangible creations of the human intellect.

See CELT and Intellectual property

Internet Engineering Task Force

The Internet Engineering Task Force (IETF) is a standards organization for the Internet and is responsible for the technical standards that make up the Internet protocol suite (TCP/IP).

See CELT and Internet Engineering Task Force

Intra-frame coding

Intra-frame coding is a data compression technique used within a video frame, enabling smaller file sizes and lower bitrates, with little or no loss in quality.

See CELT and Intra-frame coding

JACK Audio Connection Kit

JACK Audio Connection Kit (or JACK; a recursive acronym) is a professional sound server API and pair of daemon implementations to provide real-time, low-latency connections for both audio and MIDI data between applications.

See CELT and JACK Audio Connection Kit

Jami (software)

Jami (formerly GNU Ring, SFLphone) is a SIP-compatible distributed peer-to-peer softphone and SIP-based instant messenger for Linux, Microsoft Windows, macOS, iOS, and Android.

See CELT and Jami (software)

Joint encoding

In audio engineering, joint encoding refers to a joining of several channels of similar information during encoding in order to obtain higher quality, a smaller file size, or both.

See CELT and Joint encoding

Latency (engineering)

Latency, from a general point of view, is a time delay between the cause and the effect of some physical change in the system being observed.

See CELT and Latency (engineering)

Library (computing)

In computer science, a library is a collection of read-only resources that is leveraged during software development to implement a computer program.

See CELT and Library (computing)

Linear prediction

Linear prediction is a mathematical operation where future values of a discrete-time signal are estimated as a linear function of previous samples.

See CELT and Linear prediction

Lossy compression

In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content.

See CELT and Lossy compression

Modified discrete cosine transform

The modified discrete cosine transform (MDCT) is a transform based on the type-IV discrete cosine transform (DCT-IV), with the additional property of being lapped: it is designed to be performed on consecutive blocks of a larger dataset, where subsequent blocks are overlapped so that the last half of one block coincides with the first half of the next block.

See CELT and Modified discrete cosine transform

MP3

MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a coding format for digital audio developed largely by the Fraunhofer Society in Germany under the lead of Karlheinz Brandenburg, with support from other digital scientists in other countries.

See CELT and MP3

Mumble (software)

Mumble is a voice over IP (VoIP) application primarily designed for use by gamers and is similar to programs such as TeamSpeak.

See CELT and Mumble (software)

Ogg

Ogg is a free, open container format maintained by the Xiph.Org Foundation. CELT and Ogg are Xiph.Org projects.

See CELT and Ogg

Opus (audio format)

Opus is a lossy audio coding format developed by the Xiph.Org Foundation and standardized by the Internet Engineering Task Force, designed to efficiently code speech and general audio in a single format, while remaining low-latency enough for real-time interactive communication and low-complexity enough for low-end embedded processors. CELT and Opus (audio format) are free audio codecs, speech codecs and Xiph.Org projects.

See CELT and Opus (audio format)

Overlap–add method

In signal processing, the overlap–add method is an efficient way to evaluate the discrete convolution of a very long signal x with a finite impulse response (FIR) filter h: where h.

See CELT and Overlap–add method

Packet loss concealment

Packet loss concealment (PLC) is a technique to mask the effects of packet loss in voice over IP (VoIP) communications.

See CELT and Packet loss concealment

Pulse-code modulation

Pulse-code modulation (PCM) is a method used to digitally represent analog signals.

See CELT and Pulse-code modulation

Pyramid vector quantization

Pyramid vector quantization (PVQ) is a method used in audio and video codecs to quantize and transmit unit vectors, i.e. vectors whose magnitudes are known to the decoder but whose directions are unknown.

See CELT and Pyramid vector quantization

Quantization (signal processing)

Quantization, in mathematics and digital signal processing, is the process of mapping input values from a large set (often a continuous set) to output values in a (countable) smaller set, often with a finite number of elements.

See CELT and Quantization (signal processing)

Range coding

Range coding (or range encoding) is an entropy coding method defined by G. Nigel N. Martin in a 1979 paper,, Video & Data Recording Conference, Southampton, UK, July 24–27, 1979.

See CELT and Range coding

Real-time Transport Protocol

The Real-time Transport Protocol (RTP) is a network protocol for delivering audio and video over IP networks.

See CELT and Real-time Transport Protocol

Reference implementation

In the software development process, a reference implementation (or, less frequently, sample implementation or model implementation) is a program that implements all requirements from a corresponding specification.

See CELT and Reference implementation

Royalty-free

Royalty-free (RF) material subject to copyright or other intellectual property rights may be used without the need to pay royalties or license fees for each use, per each copy or volume sold or some time period of use or sales.

See CELT and Royalty-free

Sampling (signal processing)

In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal.

See CELT and Sampling (signal processing)

SILK

SILK is an audio compression format and audio codec developed by Skype Limited, now a Microsoft subsidiary. CELT and SILK are speech codecs.

See CELT and SILK

Simple Protocol for Independent Computing Environments

In computing, SPICE (the Simple Protocol for Independent Computing Environments) is a remote-display system built for virtual environments which allows users to view a computing "desktop" environment – not only on its computer-server machine, but also from anywhere on the Internet – using a wide variety of machine architectures.

See CELT and Simple Protocol for Independent Computing Environments

Software patent

A software patent is a patent on a piece of software, such as a computer program, libraries, user interface, or algorithm.

See CELT and Software patent

Spectral band replication

Spectral band replication (SBR) is a technology to enhance audio or speech codecs, especially at low bit rates and is based on harmonic redundancy in the frequency domain.

See CELT and Spectral band replication

Speex

Speex is an audio compression codec specifically tuned for the reproduction of human speech and also a free software speech codec that may be used on voice over IP applications and podcasts. CELT and speex are free audio codecs, speech codecs and Xiph.Org projects.

See CELT and Speex

References

[1] https://en.wikipedia.org/wiki/CELT

Also known as Constrained Energy Lapped Transform, Libcelt.

, Sampling (signal processing), SILK, Simple Protocol for Independent Computing Environments, Software patent, Spectral band replication, Speex, Team Fortress 2, TeamSpeak, Transform coding, Transient (acoustics), Transparency (data compression), Variable bitrate, Vector quantization, Voice over IP, Vorbis, Window function, Xiph.Org Foundation.

CELT, the Glossary

Table of Contents

See also

Free audio codecs

Xiph.Org projects

References