Question: In the EVS (Enhanced Voice Services) codec, what is the primary purpose of applying a non-linear transform to the input energies before FD-CNG (Fullband Continuous Noise Generator) noise estimation?
Option 1: To increase the sensitivity of the noise estimator to transient signals
Option 2: To enhance the spectral resolution of the background noise
Option 3: To reduce the dynamic range of the input energies for simplified fixed-point implementation
Option 4: To amplify low-energy components in the input spectrum
Explanation: The correct answer, Option 3, highlights a crucial aspect of efficient algorithm implementation in telecommunications. By reducing the dynamic range of input energies through a non-linear transform, the EVS codec facilitates a more straightforward and resource-efficient fixed-point implementation of the noise estimation algorithm. This approach is particularly important in telecom systems where computational resources are limited and must be utilized optimally to ensure high-quality voice services. The other options are incorrect because they do not accurately reflect the primary purpose of the non-linear transform in the context of FD-CNG noise estimation as described.