10. The method of claim 9 , wherein the first criterion comprises determining whether the average frame likelihood score of the retained speech audio files satisfies a criterion β r ≥δ+Δ, where Δ is a first predetermined threshold, and wherein the second criterion comprises determining whether the phoneme recognition accuracy γ g of the retained speech audio files satisfies a criterion γ g ≥ν+μ, where μ is a second predetermined threshold.
10. The method of claim 9 , wherein the first criterion comprises determining whether the average frame likelihood score of the retained speech audio files satisfies a criterion β r ≥δ+Δ, where Δ is a first predetermined threshold, and wherein the second criterion comprises determining whether the phoneme recognition accuracy γ g of the retained speech audio files satisfies a criterion γ g ≥ν+μ, where μ is a second predetermined threshold. 12. The method of claim 10 , wherein μ=−0.2ν.