基于ATmega16的无线录音系统设计与实现

发布时间：2018-01-21 13:41

本文关键词： 无线录音无线话筒单片机锁相环红外遥控 VHF　出处：《华中师范大学》2012年硕士论文　论文类型：学位论文

【摘要】：随着计算机和多媒体技术的广泛普及,多媒体教学已由高校至中学逐渐普及开来,除了教学采用多媒体以外,会议系统也引入了这一技术,借助多媒体技术,会议在传统的文字文件的基础上添加了直观的图片和数据报表,使得会议内容变得丰富多彩,明了易懂。无论是课堂教学还是会议系统,都会涉及内容记录的问题,有些重要的课堂和会议在文笔记录的同时还需要语音记录,此外在影视娱乐节目的制作过程中也需要录音,目前普通的录音笔只能凭借用户手持录音,这种方式在上述场合应用时通常距离被录者较远,录制到的声音中环境背景噪音大,距离远了噪声甚至能盖过被录者的声音,难以达到令人满意的效果。本文旨在设计一种小体积、低成本、低功耗、无失真、使用方便的无线音频录制系统以满足课堂录音之用,同时还可以应用在会议系统和影视娱乐节目的制作中,具有非常广阔的市场前景。本文针对上述场合中广泛使用的无线话筒工作原理进行深入研究,使得系统能够自动锁定并稳定接收市面上大部分主流无线话筒的音频信号,具有极强的通用性,降低了系统的应用成本。系统在硬件方面以Atemel公司的AVR系列单片机ATmega16为中央处理器,应用PHILIPS公司的TEA5767接收FM频段,索尼公司的CXA1691与锁相环MCD2005RX组合接收VHF200MHz频段,所接收到的无线话筒信号由WTV-NAND录制保存为MP3、WAV格式并通过USB接口上传至电脑,同时也可现场回放录音文件。全部操作过程可由红外遥控,增强了用户的使用便利性。在软件方面主要采用C语言编程,使系统一方面能根据已知无线话筒频率固定接收信号,另一方面在未知情况下自动搜索话筒的信号频率并锁定接收,同时将信号强弱、录音时长、话筒频率等相关信息显示在液晶屏上,增强用户的体验感。实验结果表明,本系统能够自动搜索到当前无线话筒的信号并锁定接收,同时将接收到的音频信号保存在存储卡上。整个系统达到了设计初衷,取得了令人满意的录音效果。
[Abstract]:With the wide popularization of computer and multimedia technology, multimedia teaching has been gradually popularized from university to middle school. In addition to the use of multimedia in teaching, the conference system has also introduced this technology, with the help of multimedia technology. Based on the traditional text documents, the conference adds intuitive pictures and data reports, which makes the content of the meeting colorful and easy to understand. Both classroom teaching and conference system will involve the problem of content recording, some important classes and meetings in writing records, but also need voice recording. In addition, in the production of entertainment programs in the process of recording, the current ordinary recording pen can only rely on the user hand-held recording, this way in the application of the situation is usually far away from the recorded. It is difficult to achieve satisfactory results because the background noise of the recorded sound is high, the distance is far away and the noise can even cover the voice of the recorded person. The purpose of this paper is to design a wireless audio recording system with small volume, low cost, low power consumption, no distortion and convenient use to meet the needs of classroom audio recording. At the same time, it can also be used in the production of conference system and entertainment program, which has a very broad market prospect. In this paper, the working principle of wireless microphone which is widely used in the above occasions is deeply studied, so that the system can automatically lock and receive the audio signal of most of the mainstream wireless microphone in the market. It has strong generality and reduces the application cost of the system. In the hardware aspect, the ATmega16 of AVR series of Atemel company is used as the central processor, and the TEA5767 of PHILIPS Company is used to receive FM frequency band. Sony's CXA1691 and PLL MCD2005RX are combined to receive the VHF200MHz band, and the received wireless microphone signals are recorded by WTV-NAND and saved as MP3. The WAV format is uploaded to the computer through the USB interface. At the same time, the recording file can also be replayed on the spot. The whole operation process can be controlled by infrared remote control, which enhances the convenience of the user. In the software aspect, C language is mainly used to program the system. On the one hand, the system can fix the received signal according to the known frequency of the wireless microphone, on the other hand, it can automatically search the frequency of the microphone and lock the receiver in the unknown situation. At the same time, the signal intensity, recording time, microphone frequency and other related information are displayed on the LCD screen to enhance the user's experience. The experimental results show that the system can automatically search the current wireless microphone signal and lock the receiver, while the received audio signal is stored on the memory card. The whole system achieves the design intention. Satisfactory recording effect has been obtained.
【学位授予单位】：华中师范大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TN912.2;TP368.1

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