VS1003 是一个单片MP3/WMA/MIDI音频解码器和ADPCM编码器。它包含一个高性能，自主产权的低功 耗DSP 处理器核VS_DSP4,工作数据存储器，为用户应用提供5KB 的指令RAM 和0.5KB 的数据RAM。 串行的控制和数据接口，4 个常规用途的I/O 口，一个UART，也有一个高品质可变采样率的ADC和立体 声DAC，还有一个耳机放大器和地线缓冲器。-The VS1003 is a the monolithic MP3/WMA/MIDI audio decode

Low bit-rate speech coders are important in many critical communication systems such as military, police, fire departments, homeland security and other first responders. The need for elimination, reduction of the redundancy or irrelevant information

Abstract— We propose a simple speech compression algorithm using subband division and ADPCM (Adaptive Differential Pulse Code Modulation) algorithm. Although speech data are stored in a semiconductor memory device, its capacity and the availa