具有检索功能的机载MP3录音机设计

传统的机载录音设备存在记录时间短、录音质量差、查询困难等缺点,提出了一种新的数字录音机设计方案;介绍了MP3编码原理,对混合滤波器组进行了重点分析,包括子带滤波器组、MDCT及窗口选择,介绍了系统设计方案,给出了在S3C2440A上移植开源的MP3编码器shine的过程,提出了一种简单有效的检索信息产生算法,以便于在回放时迅速找到播放点;实验结果表明达到了预期设计目标,在2G的电子盘上可连续记录23h的高质量音频信号,体积小,功耗低,是传统机载录音设备的理想替代品。

An Airborne MP3 Recorder with Query Information

There are shortcomings such as short recording-time,bad quality and hard to query exist in traditional airborne audio recorder,this paper proposed a new design of digital recorder.Introduced the principle of MP3 encoding and imposed on the Mixed filter bank including sub-band filter bank,MDCT and window switching.The open source MP3 encoder shine was imported to S3C2440A.A simple but effective query information generating algorithm was proposed for fast searching voice point in case of replay.The result shows it can record 23h high quality audio signal in a 2Gbytes E-Disk,It is an ideal replication of traditional audio recorder for its smaller size and lower power.