Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Adaptive Multi-Rate audio codec

The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR is a multi-rate narrowband speech codec that encodes narrowband (200–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s.

Art, Software support & Usage

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Adaptive Multi-Rate audio codec. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Software support

AudacityFFmpegAndroidMPlayerSMPlayer
17 related topics

Usage

ACELPDTXVADCNGSource coding
8 related topics

Features

Linear predictive codingLine spectral pairsG.711G.729aPSQM
6 related topics

Licensing and patent issues

PatentsNokiaEricssonNTTPatent pools
6 related topics

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Free format?
No
Initial release
23 June 1999 (1999-06-23)
Internet media type
audio/amr, audio/3gpp, audio/3gpp2
Latest release
14.0.0 17 March 2017; 9 years ago (2017-03-17)
Open format?
Yes
Type of format
Lossy audio

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Usage

Features

Licensing and patent issues

Software support

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Adaptive Multi-Rate audio codec

Nodes56
Edges55
Triples7
Avg. degree1.96
Density0.035714
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Adaptive Multi-Rate audio codec

Top relations

Filename extension · 1
Adaptive Multi-Rate audio codec → .mw-parser-output .monospaced{font-family:monospace,monospace} .amr, .3ga
Free format? · 1
Adaptive Multi-Rate audio codec → No
Initial release · 1
Adaptive Multi-Rate audio codec → 23 June 1999 (1999-06-23)
Internet media type · 1
Adaptive Multi-Rate audio codec → audio/amr, audio/3gpp, audio/3gpp2
Latest release · 1
Adaptive Multi-Rate audio codec → 14.0.0 17 March 2017; 9 years ago (2017-03-17)
Open format? · 1
Adaptive Multi-Rate audio codec → Yes
Type of format · 1
Adaptive Multi-Rate audio codec → Lossy audio

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

amr format codec speech audio rates also coding 12 used based 3gpp free media source codecs kbit using multi-rate bit

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Adaptive Multi-Rate audio codecFilename extension.mw-parser-output .monospaced{font-family:monospace,monospace} .amr, .3ga1.00infobox
Adaptive Multi-Rate audio codecFree format?No1.00infobox
Adaptive Multi-Rate audio codecInitial release23 June 1999 (1999-06-23)1.00infobox
Adaptive Multi-Rate audio codecInternet media typeaudio/amr, audio/3gpp, audio/3gpp21.00infobox
Adaptive Multi-Rate audio codecLatest release14.0.0 17 March 2017; 9 years ago (2017-03-17)1.00infobox
Adaptive Multi-Rate audio codecOpen format?Yes1.00infobox
Adaptive Multi-Rate audio codecType of formatLossy audio1.00infobox

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.