Digital voice storage and playback system, the system is mainly collected by the voice, gain, band-pass filter, A \ D, D \ A conversion, 51 single, external RAM storage, power amplifier, speakers of several major components. Which collected mainly by the electret microphone voice to achieve. Then gain amplification section with over tens of milliamps signal amplification to 0 ~ 8A or so. Then filtered using band-pass filter the noise with the sound field by the A \ D conversion of sound signals into digital signals stored in the microcontroller' s external memory, can be stored at 4 seconds. By the D \ A converted into analog signal filtered through the noise with the same filter, power amplifier part of the amplification power, the final output from the speaker.

数字化语音存储与回放系统报告--设计报告.doc

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