Abstract: This paper focuses on the low error rate, high recognition rate, off-line speech recognition refrigerator and control system. Taking MCU as the processing center, the audio data is collected by ADC in advance, and the collected audio data are combined with the algorithm to realize speech recognition. The speech recognition system with the directional noise reduction algorithm combined with the three MIC noise reduction algorithm is used as the human-computer interaction device of the refrigerator, adding the human detection and the arousal word trigger, and combining the MCU filtering algorithm and the signal window processing to greatly reduce the interference of the periodic environment noise to the speech interaction, and reduce the false trigger rate of the speech interaction, and improve the speech interaction. The accuracy of speech recognition. The refrigerator with the speech recognition control of this scheme is very practical, brings great convenience to the operation of the user. It is a great promotion, low cost and simple system in the human computer interaction of the intelligent refrigerator. It is a breakthrough operation method after the touch button operation of the refrigerator, which greatly improves the user experience. Thus, the market competitiveness of products is enhanced and potential development and expansion prospects are possible.

Key words: Speech recognition, Intelligent control, Directional noise reduction, Three wheat array, Low false triggering, Human detection, Threshold filtering