Now automatic speech recognition (ASR) is not a simplex signal processing. The natural language processing is more and more regarded in Chinese ASR.
汉语语音识别的研究越来越重视与语言处理的结合，语音识别已经不是单纯的语音信号处理。
The master control chip uses AT89C51, the communication mode adopts DTMF signal with strong anti-interference and high reliability, and simplex frequency modulation.
主控芯片采用AT89C51单片机，通信方式采用抗干扰能力强、可靠性高的DTMF信号和单工调频的无线通信方式。
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