The conditions are exclusively narrowband speech degradations but are useful for speech quality benchmarking and remain actively used for objective VoIP speech quality models, e.g., [48].
This work presents results from tests using a combination of existing databases where available and subjective tests carried out by the authors for assessing objective model performance for a range of VoIP specific and general speech degradations.
Based on such findings, an improved version of RCM, referred to as the Fixed-G1-RCM approach, is presented to achieve the aim of search load improvement in the absence of speech quality degradation.
In an arbitrary structured algebraic codebook, there is no doubt in this study, as opposed to RCM, that the G1 pulse with a higher probability of hitting one of the four optimal pulses gives rise to a less degree of speech quality degradation.
P.834.1 [15], see also [47], emphasizing the need for such a standardized method to determine wideband speech codec degradations.
When dealing with speech quality degradations that are constrained to background noise or speech enhancement algorithms attempting to counteract noise, simple SNR distance metrics may suffice.
(I am excluding hateful satire and caricature -- which is not intended to be humorous but, like hate speech, to incite degradation and violence).
