基于STM32的光话机ADPCM压缩编码算法与实现

针对部分光纤铺设及维护工作是在山区、森林等无线信号差的条件下进行的情况，文中为了解决此种环境下通话困难的问题，同时降低数码率，节省光纤带宽，采用了一种简化的语音压缩编码算法，并在基于STM32单片机的光话机中实现。该压缩编码算法采用自适应差分脉冲编码调制技术，具有较高的压缩比。仿真实验表明，在压缩比为4:1的条件下，可获得较低的数码率和较高的语音通话质量。

Optical Telephone ADPCM Compression Coding Algorithm and Implementation Based on STM32

Some optical fiber laying and maintenance are carried out in poor wireless environment, such as mountain areas and forests. In order to solve the problem of call difficulties in such environments, reduce digital rate and save fiber bandwidth, a simplified speech compression coding algorithm is adopted and realized in optical telephones based on the STM32 single chip microcomputer. The speech compression coding algorithm adopts the adaptive differential pulse code modulation technology, which has high compression ratio. Simulation result shows that it can achieve high quality voice calls at a compression ratio of 4:1.