10. The method of claim 1 , further comprising: prior to operating said N neural networks, training at least one of said N neural networks using a set of speech signal feature data and a corresponding known signal feature set quality score which was obtained through subjective human testing.
10. The method of claim 1 , further comprising: prior to operating said N neural networks, training at least one of said N neural networks using a set of speech signal feature data and a corresponding known signal feature set quality score which was obtained through subjective human testing. 11. The method of claim 10 , further comprising: prior to operating said joint quality score determination neural network to generate a joint quality score, training said joint quality score determination neural network using a known set of signal feature quality scores and a corresponding predetermined joint signal feature set quality score.