What is Adaptive Multi-Rate audio?
A speech audio format commonly used in mobile recordings.
Server processing uses engines we host. Availability depends on the deployed engine and supported file variant.
Technical details
AMR stores speech codec frames using defined frame types and bit rates; AMR-WB extends the codec for wider-band speech. [1]
Background and compatibility
The IETF RTP specification preserves AMR frame-type information when sending it over networks, reflecting its voice-telephony use. [1]
Sources and references
Preview on your device
Playback when the browser supports the audio codec.
Conversion support
Choose a file in the workspace to see the available output formats and options. A supported container may still contain an unsupported codec.
Read the format reference on Wikipedia ↗