AMR is ADAPTIVE MUTIRATE IT AMY BE AMR HR/AMR FR. actually AMR is best speech coding method in which we can get more enhanced quality as comparasion to HR/FR/EFR in traffic congestion cases , it uses Link Adaption method by which we can maintain balace between capacity & quality. AMR uses less bit rate to provide better voice quality , in that case we can get more bit for error correction.
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