It makes use of phoneme lattices generated by a phoneme recognizer.Acoustic Model (AM) based CM is also introduced.For a decoded speech frame aligned to an HMM state, the CM based on AM is calculated.

• 与传统的基于整个声学模型的置信度不同的是，这种方法在解码器生成的音素网格上计算关键词的置信度，从而具有更好的拒识能力。