6.6 Output signal generation

26.2903GPPAudio codec processing functionsExtended Adaptive Multi-Rate - Wideband (AMR-WB+) codecRelease 17Transcoding functionsTS

The decoder output signal(s) are generated by combining the low and high band signal to produce full band signals. This operation is the inverse of the encoder band-splitting operation described in section 5.1. The following figure shows how the operation is performed.

The exact same filters used in the encoder are re-used in the decoder. Furthermore, if the desired output sampling rate is different from the internal sampling rate, then a resampling operation is preformed which is the reverse operation of that performed in the encoder.