A-law algorithm

A-lawPCMA
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.wikipedia
62 Related Articles

Pulse-code modulation

PCMLPCMLinear PCM
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.
This is in contrast to PCM encodings where quantization levels vary as a function of amplitude (as with the A-law algorithm or the μ-law algorithm).

Companding

compandercompandedcompandor
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.
The two most popular compander functions used for telecommunications are the A-law and μ-law functions.

G.711

G711G.711.1ITU G.711
It is one of two versions of the G.711 standard from ITU-T, the other version being the similar μ-law, used in North America and Japan.
There are two slightly different versions: μ-law, which is used primarily in North America and Japan, and A-law, which is in use in most other countries outside North America.

Μ-law algorithm

μ-lawu-lawPCMU
It is one of two versions of the G.711 standard from ITU-T, the other version being the similar μ-law, used in North America and Japan.
It is one of two versions of the G.711 standard from ITU-T, the other version being the similar A-law, used in regions where digital telecommunication signals are carried on E-1 circuits, e.g. Europe.

Europe

EuropeanEUEuropean continent
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.

Digital data

digitaldigital informationdigitally
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.

Telecommunication

telecommunicationscommunicationstelecom
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.

Dynamic range

DRdynamicdynamic and tonal range
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. The reason for this encoding is that the wide dynamic range of speech does not lend itself well to efficient linear digital encoding.

Analog signal

analoganalogueanalogue signal
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.

ITU-T

CCITTITU Telecommunication Standardization SectorTelecommunication Standardization Sector
It is one of two versions of the G.711 standard from ITU-T, the other version being the similar μ-law, used in North America and Japan.

Speech

spokenspeakingspeech communication
The reason for this encoding is that the wide dynamic range of speech does not lend itself well to efficient linear digital encoding.

Forward error correction

FECchannel codingerror correcting codes
A-law encoding effectively reduces the dynamic range of the signal, thereby increasing the coding efficiency and resulting in a signal-to-distortion ratio that is superior to that obtained by linear encoding for a given number of bits.

Distortion

distortedharmonic distortiondistort
A-law encoding effectively reduces the dynamic range of the signal, thereby increasing the coding efficiency and resulting in a signal-to-distortion ratio that is superior to that obtained by linear encoding for a given number of bits.

Voice over IP

VoIPVoice over Internet Protocolvoice-over-IP
Popular codecs include the MDCT-based AAC-LD (used in FaceTime), the LPC/MDCT-based Opus (used in WhatsApp), the LPC-based SILK (used in Skype), μ-law and A-law versions of G.711, G.722, and an open source voice codec known as iLBC, a codec that uses only 8 kbit/s each way called G.729.

NICAM

NICAM digital stereoNICAM stereoNear Instantaneous Companded Audio Multiplex
NICAM sampling more closely resembles Adaptive Differential Pulse Code Modulation, or A-law companding with an extended, rapidly modifiable dynamic range.

RTP payload formats

RTP audio video profileRTP audio video formatsRTP Audio Video Profiles

Speech coding

speech encodingspeech codecSpeech
From this point of view, the A-law and μ-law algorithms (G.711) used in traditional PCM digital telephony can be seen as an earlier precursor of speech encoding, requiring only 8 bits per sample but giving effectively 12 bits of resolution.

List of Bluetooth profiles

A2DPAVRCPBluetooth profile
It commonly uses Synchronous Connection Oriented link (SCO) to carry a monaural audio channel with continuously variable slope delta modulation or pulse-code modulation, and with logarithmic a-law or μ-law quantization.