The ADPCM compression and decompression of 16 bit speech signal is the classical method. In the paper,the algorithm of 8 bit mono speech signal is given to implement speech synthesis on the Chinese language teaching machine, and using the algorithm in Elan 8-bit MCU EPG3231 the real-time voice decoding and playback is realized by applying assembly language. The results show that , the correlation between the original voice data and the decoding data reach up to 0.999843 , that indicated the rate distortion of decoding data is low , attaining the expectation.%16bit语音信号的ADPCM压缩和解压是传统的经典方法,为了在汉语语言教学机上实现语音的合成,作者给出了8位单声道语音信号算法,并在ELAN 8位单片机EPG3231上使用该算法用汇编语言实现了语音的实时解码和回放.实验结果表明,原始的语音数据和解码后的数据相关性达0.999843,说明解码后的数据失真率低,达到预期要求.
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