本文關鍵詞： 無線錄音 無線話筒 單片機 鎖相環(huán) 紅外遙控 VHF　出處：《華中師范大學》2012年碩士論文　論文類型：學位論文

【摘要】：隨著計算機和多媒體技術的廣泛普及,多媒體教學已由高校至中學逐漸普及開來,除了教學采用多媒體以外,會議系統(tǒng)也引入了這一技術,借助多媒體技術,會議在傳統(tǒng)的文字文件的基礎上添加了直觀的圖片和數(shù)據(jù)報表,使得會議內(nèi)容變得豐富多彩,明了易懂。 無論是課堂教學還是會議系統(tǒng),都會涉及內(nèi)容記錄的問題,有些重要的課堂和會議在文筆記錄的同時還需要語音記錄,此外在影視娛樂節(jié)目的制作過程中也需要錄音,目前普通的錄音筆只能憑借用戶手持錄音,這種方式在上述場合應用時通常距離被錄者較遠,錄制到的聲音中環(huán)境背景噪音大,距離遠了噪聲甚至能蓋過被錄者的聲音,難以達到令人滿意的效果。 本文旨在設計一種小體積、低成本、低功耗、無失真、使用方便的無線音頻錄制系統(tǒng)以滿足課堂錄音之用,同時還可以應用在會議系統(tǒng)和影視娛樂節(jié)目的制作中,具有非常廣闊的市場前景。 本文針對上述場合中廣泛使用的無線話筒工作原理進行深入研究,使得系統(tǒng)能夠自動鎖定并穩(wěn)定接收市面上大部分主流無線話筒的音頻信號,具有極強的通用性,降低了系統(tǒng)的應用成本。 系統(tǒng)在硬件方面以Atemel公司的AVR系列單片機ATmega16為中央處理器,應用PHILIPS公司的TEA5767接收FM頻段,索尼公司的CXA1691與鎖相環(huán)MCD2005RX組合接收VHF200MHz頻段,所接收到的無線話筒信號由WTV-NAND錄制保存為MP3、WAV格式并通過USB接口上傳至電腦,同時也可現(xiàn)場回放錄音文件。全部操作過程可由紅外遙控,增強了用戶的使用便利性。 在軟件方面主要采用C語言編程,使系統(tǒng)一方面能根據(jù)已知無線話筒頻率固定接收信號,另一方面在未知情況下自動搜索話筒的信號頻率并鎖定接收,同時將信號強弱、錄音時長、話筒頻率等相關信息顯示在液晶屏上,增強用戶的體驗感。 實驗結(jié)果表明,本系統(tǒng)能夠自動搜索到當前無線話筒的信號并鎖定接收,同時將接收到的音頻信號保存在存儲卡上。整個系統(tǒng)達到了設計初衷,取得了令人滿意的錄音效果。
[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.
【學位授予單位】：華中師范大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TN912.2;TP368.1

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