具有检索功能的机载MP3录音机设计

An Airborne MP3 Recorder with Query Information

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。

There are shortcomings such as short recording-time, had 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.