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G.711

Index G.711

G.711 is an ITU-T standard for audio companding. [1]

36 relations: A-law algorithm, Bit numbering, Clock recovery, Comfort noise, Companding, Comparison of audio coding formats, Decibel, Discontinuous transmission, Encoder, Exponentiation, Fax, Floating-point arithmetic, G.703, H.320, H.323, ITU-T, List of codecs, Logarithmic scale, Lossless compression, Mean opinion score, Modified discrete cosine transform, Narrowband, Packet loss concealment, PSQM, Pulse-code modulation, RTP audio video profile, Signed number representations, Significand, Speech coding, T.38, Telephony, Two's complement, Voice activity detection, Voice over IP, Waveform, Wideband.

A-law algorithm

An A-law algorithm is a standard companding algorithm, used in European 8-bit PCM digital communications systems to optimize, i.e. modify, the dynamic range of an analog signal for digitizing.

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Bit numbering

In computing, bit numbering (or sometimes bit endianness) is the convention used to identify the bit positions in a binary number or a container for such a value.

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Clock recovery

In serial communication of digital data, clock recovery is the process of extracting timing information from a serial data stream to allow the receiving circuit to decode the transmitted symbols.

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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.

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Companding

In telecommunication and signal processing companding (occasionally called compansion) is a method of mitigating the detrimental effects of a channel with limited dynamic range.

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Comparison of audio coding formats

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

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Decibel

The decibel (symbol: dB) is a unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale.

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Discontinuous transmission

Discontinuous transmission (DTX) is a means by which a mobile telephone is temporarily shut off or muted while the phone lacks a voice input.

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Encoder

An encoder is a device, circuit, transducer, software program, algorithm or person that converts information from one format or code to another, for the purposes of standardization, speed or compression.

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Exponentiation

Exponentiation is a mathematical operation, written as, involving two numbers, the base and the exponent.

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Fax

Fax (short for facsimile), sometimes called telecopying or telefax (the latter short for telefacsimile), is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device.

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Floating-point arithmetic

In computing, floating-point arithmetic is arithmetic using formulaic representation of real numbers as an approximation so as to support a trade-off between range and precision.

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G.703

G.703 is a 2016 ITU-T standard for transmitting voice or data over digital carriers such as T1 and E1.

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H.320

H.320 is an umbrella recommendation by the ITU-T for running Multimedia (Audio/Video/Data) over ISDN based networks.

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H.323

H.323 is a recommendation from the ITU Telecommunication Standardization Sector (ITU-T) that defines the protocols to provide audio-visual communication sessions on any packet network.

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ITU-T

The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.

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List of codecs

The following is a list of compression formats and related codecs.

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Logarithmic scale

A logarithmic scale is a nonlinear scale used when there is a large range of quantities.

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Lossless compression

Lossless compression is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data.

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Mean opinion score

Mean opinion score (MOS) is a measure used in the domain of Quality of Experience and telecommunications engineering, representing overall quality of a stimulus or system.

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Modified discrete cosine transform

The modified discrete cosine transform (MDCT) is a lapped 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.

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Narrowband

In radio, narrowband describes a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.

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Packet loss concealment

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

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PSQM

PSQM (Perceptual Speech Quality Measure) is a computational and modeling algorithm defined in ITU Recommendation ITU-T P.861 that objectively evaluates and quantifies voice quality of voice-band (300 – 3400 Hz) speech codecs.

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Pulse-code modulation

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

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RTP audio video profile

The RTP audio/video profile (RTP/AVP) is a profile for Real-time Transport Protocol (RTP) that specifies the technical parameters of audio and video streams.

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Signed number representations

In computing, signed number representations are required to encode negative numbers in binary number systems.

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Significand

The significand (also mantissa or coefficient) is part of a number in scientific notation or a floating-point number, consisting of its significant digits.

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Speech coding

Speech coding is an application of data compression of digital audio signals containing speech.

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T.38

T.38 is an ITU recommendation for allowing transmission of fax over IP networks in real time.

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Telephony

Telephony is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties.

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Two's complement

Two's complement is a mathematical operation on binary numbers, best known for its role in computing as a method of signed number representation.

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Voice activity detection

Voice activity detection (VAD), also known as speech activity detection or speech detection, is a technique used in speech processing in which the presence or absence of human speech is detected.

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Voice over IP

Voice over Internet Protocol (also voice over IP, VoIP or IP telephony) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.

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Waveform

A waveform is the shape and form of a signal such as a wave moving in a physical medium or an abstract representation.

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Wideband

In communications, a system is wideband when the message bandwidth significantly exceeds the coherence bandwidth of the channel.

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Redirects here:

G.711.0, G.711.1, G711.

References

[1] https://en.wikipedia.org/wiki/G.711

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