Tandeming analysis of perceptual pre-weighting and post-weighting Multimode Tree Coder

The perceptual pre-weighting and post-weighting Multimode Tree Coder is low delay and low complexity. Since the tandem connection of different codecs in voice calls is common today, it is also important to assess any loss in end-to-end speech quality caused by asynchronous tandem coding. We evaluate the tandeming performance of our Multimode Tree Coder when tandemed with itself, with G.727, and with the AMR-NB codec. The results show that the tandem performance of the Multimode Tree Coder is comparable to the AMR-NB coder at 12.2 kbps.