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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65526

    Title: 利用離散餘弦基礎之聲音浮水印達到室內定位技術;Using DCT-Based Audio Watermark for Indoor Location System
    Authors: 高霈珊;Kao,Pei-shan
    Contributors: 通訊工程學系
    Keywords: 離散餘弦變換;音訊浮水印;室內定位;Discrete Cosine Transform;Audio Watermark;Indoor Location System
    Date: 2014-07-29
    Issue Date: 2014-10-15 17:02:45 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 隨著全球衛星定位系統 (Global Position System) 的廣泛利用,人們對於定位導航的功能日漸依賴,當所要前往的目的地或是當下所處的位置是陌生時,便會非常希望有定位導航的服務,以提供方向的指引,由於建築物的遮蔽效應,GPS的訊號在室內會有明顯的衰弱現象,定位結果也會嚴重受到影響而失去精準度。因此如何發展一套良好的室內定位系統是近來許多相關研究的目標。
    現有的室內定位技術多半使用無線接取技術 (Radio Access Technology) 做為傳輸媒介,例如:利用Wi-Fi訊號的三角定位法,或是利用藍芽技術的iBeacon等,然而這些技術都需要額外佈建相關設備,像是無線接取設備 (Access Point) 、藍芽接收裝置等,因此我們希望能夠透過另外一種傳輸媒介來完成室內定位的功能,並且避免花費額外佈建設備的成本。
    ;With the wide using of Global Positioning System, people more and more rely on positioning and navigation functions. When we want to go to somewhere we have never been to, we would like to have positioning and navigation functions for giving directions. Due to the shadowing effect of the building, GPS signals will be attenuated significantly and positioning results will be affected seriously. How to develop an accurate indoor location system is the goal of many relevant studies in recent years.
    Most of existing indoor location techniques use radio access technologies as the transmission medium, such as the Geometrical Triangulation of using Wi-Fi and iBeacon of using Bluetooth, etc. However, these techniques still exist the problem of location accuracy, as well as the need of providing additional related equipment. As the result, we hope that we can through another kind of medium to achieve accurate indoor location function and it can avoid the extra cost of devices.
    The most common medium for transmitting message in daily life is the sound. For example, the advertisement audio in the supermarket and the doorbell in the convenient store, etc. These sound are accustomed to be heard. If we can through embed information into these music, we don’t need to provide any additional devices. When users use their smart phones to record the audio, they can easily know their location by extracting the embedded information. The task of indoor location is completed.
    This thesis proposes a new technique for indoor location system. By audio watermark, we embed the longitude and latitude information into the music. After users receive the audio from their smart phones, and extract it by the application, they can get the current location information and then instantly display on their devices to complete the application of indoor location.
    Appears in Collections:[通訊工程研究所] 博碩士論文

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