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      <FormatDescription>Adaptive Multi-Rate Wideband (AMR-WB) is a wideband speech audio coding standard based on Adaptive Multi-Rate encoding. AMR-WB provides a speech bandwidth of 50–7000 Hz compared to narrowband speech coders which in general offer around 300–3400 Hz. AMR-WB was developed by Nokia and VoiceAge.</FormatDescription>
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      <ProvenanceName>Digital Preservation Department / The National Archives</ProvenanceName>
      <ProvenanceSourceDate>14 Sep 2016</ProvenanceSourceDate>
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Format description: https://tools.ietf.org/html/rfc4867</SignatureNote>
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