AMR Converter

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AMR

Adaptive Multi Rate

AMR (Adaptive Multi-Rate) is an audio compression format optimized for speech coding. Introduced in 1998, AMR was adopted for the 3GPP mobile phone standard and widely used in GSM networks. AMR is an allocation-based codec, dynamically adjusting compression bitrate based on the complexity of the audio signal. Simpler signals use lower bitrates down to 4.75 kbps, reducing transmission requirements. More complex audio pushes the bitrate higher for better fidelity. AMR can save network bandwidth overhead compared to uncompressed audio. Files encoded with AMR have a .amr file extension. The format also led to related narrowband and wideband codecs to improve speech quality and bitrate efficiency. While mainly focused on voice, newer AMR versions can handle music as well. However, newer codecs like AAC ultimately deliver better performance for music. AMR remains an important standard for efficient speech compression.

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Supported Conversions

Convert to AMR Conversions