6.4 Noise time borders

26.4023GPPAdditional decoder toolsEnhanced aacPlus general audio codecGeneral audio codec audio processing functionsTS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

The number of noise floors and the start/stop borders for the noise is calculated according to [1] for left and right channel and then merged as shown below.

After this is done. It is possible that the middle noise floor border dose not coincide with any SBR envelope time border. If this is the case the middle noise floor border is set equal to the closest time envelope border in the upwards direction.