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Adaptive Tuning of (Wideband) AMR Codec Frames for Lookup Tables

IP.com Disclosure Number: IPCOM000019954D
Original Publication Date: 2003-Nov-25
Included in the Prior Art Database: 2003-Nov-25

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Siemens

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Abstract

In the UMTS (Universal Mobile Telecommunications System) traffic signals are generated in the Media Gateway (MGW). Some traffic generation can be performed using a lookup table as shown in figure 1 where the lookup table sends out a sequence of AMR (Adaptive Multi-Rate) codec frames y(m) that is detected at the receiver side and decoded into an audible signal z(n). Lookup tables can be easily generated using the AMR encoder and producing codec frames based on a given ideal signal x(k) as shown in figure 2. In consequence one can derive the following equation: