A multimedia processing circuit is provided. The multimedia processing circuit includes a smart interpreter engine and an audio engine. The smart interpreter engine includes a noise suppression module, a vocal identification module and a speech to text converter. The noise suppression module is utilized for performing a noise suppression process on speech data corresponding to a first language. The vocal identification module is utilized for performing a vocal identification process on the noise-suppressed speech data corresponding to the first language to generate vocal identification data corresponding to the first language. The speech to text converter is utilized for converting the vocal identification data corresponding to the first language into text data corresponding to the first language. The audio engine is utilized for receiving speech data corresponding to the first language and converting the speech data corresponding to the first language into an analog speech signal corresponding to the first language.