18. The electronic device of claim 15 , wherein the predetermined decoding network is associated with two or more languages of English, Chinese, Japanese, Russian, French, German and the like, and includes a subset of keywords and a subset of filler words for each of the two or more languages.
15. An electronic device, comprising: one or more processors; and memory having instructions stored thereon, which when executed by the one or more processors cause the processors to perform operations comprising: receiving a sequence of audio frames comprising a current frame and a subsequent frame that follows the current frame; determining a candidate keyword for the current frame using a predetermined decoding network that comprises keywords and filler words of multiple languages, associating the audio frame sequence with a confidence score that is partially determined according to the candidate keyword; identifying a word option for the subsequent frame using the candidate keyword and the predetermined decoding network; when the candidate keyword and the word option are associated with two distinct types of languages, updating the confidence score of the audio frame sequence based on a penalty factor that is predetermined according to the two distinct types of languages, the word option and an acoustic model of the subsequent frame; and determining that the audio frame sequence includes both the candidate keyword and the word option by evaluating the updated confidence score according to a keyword determination criterion.