Speech recognition (Automatic Speech Recognition (ASR), whose goal is to convert the vocabulary content in human speech into IC-recognizable instructions. Among them, speech recognition can be divided into online speech recognition and offline speech recognition. It is a Chinese offline speech recognition technology. Offline speech recognition requires pre-designed script vocabulary that can be applied to the product and programmed into IC by the engineer. This speech recognition technology does not distinguish age, gender, as long as the speaker speaks the same language Can be identified.