amrnb: amrnb (3GPP AMR NarrowBand Speech Codecs) amrnb: amrnb: This is the 3GPP released AMR reference implementation. Adaptive amrnb: Multi-Rate Floating-point (AMR) Speech Codec 3GPP. This distribution amrnb: is for non-commercial purpose only. Ask http://www.3gpp.org for a amrnb: commercial license. amrnb: amrnb: amrnb: amrnb: amrnb: