基于功率谱估计值的数字化音乐录音系统设计

Design of digitization music recording system based on power spectrum estimation value

针对传统的数字化音乐录音系统录音质量差的问题,设计一种基于USB主机结构的数字化音乐录音系统,以解决录音质量差的问题。该系统硬件主要包括PCM编码电路和USB主机接口芯片,实现音乐信号的A/D转换和音乐数据采集功能;系统软件主要解决录音质量问题。首先对音频帧划分和音乐数据采样,其次为减少噪声数据,对音乐端点检测,并利用三角滤波器公式处理频域,最后采用谱相减法和掩蔽比较法去除背景噪声,以此完成了基于USB主机结构的数字化音乐录音系统的设计。实验对比结果表明,此次设计的系统比传统系统录音质量高,能够满足数字化音乐录音的质量要求。

A digitization music recording system based on USB host structure is designed because the recording quality of the traditional digitization music recording system is poor. The hardware of the system mainly includes PCM encoding circuit and USB host interface chip,which are used to realize the functions of music signal A/D conversion and music data acquisition.The software of the system is applied to improving the recording quality mainly. The audio frames are divided and the music data is sampled first,and then the music endpoints are detected to reduce noise data and the frequency domain is processed with the triangular filter formula. The background noises are removed by means of the spectral subtraction and masking comparison methods,so as to complete the design of the digitization music recording system based on USB host structure. The experimental comparison results show that the designed system has higher recording quality than that of the traditional system,and can meet the quality requirements of digitization music recording.