amrnb: amrnb (AMR Narrow Band Speech Codec) amrnb: amrnb: 3GPP Adaptive Multi-Rate Floating-point (AMR) amrnb: Speech Codec Shared Library. This codec is for amrnb: example used in mobile-phones. amrnb: amrnb: Homepage: http://www.penguin.cz/~utx/amr amrnb: amrnb: amrnb: amrnb: