Introduction
Now,with digital signal processing technology and continuous improvement,microcontroller,digital signal processors as well as the voice of progress in dealing with large-scale integrated circuits,speech synthesis,speech recognition,voice storage and playback technology more widely.In this paper,compact size,low power consumption of digital audio storage and playback system can replace traditional voice recording system.
1 Background and significance of topics
From the tapes,video tapes to CD,VCD,DVD; from black-and-white TV,color TV,high-definition TV (HDTV) to a digital TV signal processing functions; from the gramophone,tape recorder to the voice mail; now at analog information into digital information revolution,the traditional voice of the tape recording system because of its bulky,inconvenient to use in electronics and information processing limitations in use by many.Although the current system of radio and television has not yet been digitized real,I believe that in the near future,the real digital TV,digital radio,digital tape recorders will enter the family.Therefore,the study of digital audio signal storage,processing and playback system has a very important practical significance.
Among them,the key technologies are:In order to increase the voice storage time and increase the utilization of memory,using a non-lossy compression algorithm to compress voice signals and then stored again in the replay is decompressed; At the same time,the digital input voice signal filter to suppress noise and interference,so as to ensure reliable voice quality playback.