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通过对四路语音信号码率的计算和对现有嵌入式处理器比较,采用IMA-ADPCM压缩算法和现场可编程逻辑门阵列FPGA解决了存储容量和处理器主频过高带来的EMC问题,是多路语音记录仪单芯片实现的一个理想方案。本文还分析了USB通信协议实现了USB存储接口。本设计已成功应用于某厂数据记录系统中。
Through the calculation of the four-way voice signal bit rate and the comparison of the existing embedded processor, the IMA-ADPCM compression algorithm and the field programmable gate array FPGA solve the EMC problem caused by the storage capacity and high processor frequency , Is a multi-channel voice recorder single chip to achieve an ideal solution. This article also analyzes the USB communication protocol to achieve a USB memory interface. The design has been successfully applied to a factory data recording system.