Question: In EVS (Enhanced Voice Services) codec, as per 3GPP standards, what is the primary purpose of energy-based parameters in the context of noise energy update?
Option 1: To solely rely on pre-calculated noise estimates for all sub-bands.
Option 2: To reduce computational complexity by bypassing noise estimation altogether.
Option 3: To decrease the noise estimate sub-bands to improve voice clarity in low-SNR conditions.
Option 4: To determine when it is safe to increase the noise estimate sub-bands based on pre-calculated values.
Explanation: The correct answer highlights the key role of energy-based parameters in EVS codec - to assess the safety of increasing the noise estimate sub-bands. This process balances between noise reduction and avoiding distortion of the voice signal, especially in dynamic or variable noise environments.