Judul: Watermarking audio menggunakan metode echo hiding
Abstrak: Currently almost every aspect of life uses computers, causing the heavy use of digital data. There are several factors that cause digital data such as text, images, audio and video are widely used, partly because the data is easily and inexpensively copyed, and then easily stored for further processing, and easily distributed using either disk media or via the Internet. With such convenience is often the case in particular the use of audio digital data of illegal possession of one of the audio data such as counterfeiting or copyright infringement. Digital watermarking is one of the solution that can be used to solve the problem. Audio watermarking is a technique used in insert information or data in to audio media. Extraction can be done without affecting the audio quality. This study uses Echo Hiding watermarking method to audio file wav format. This technique works in the time domain by adding the data in a container with a raised voice signal echo. This research uses PSNR (Peak Signal to Noise Ratio) to measure the quality of the watermarked audio. From the analysis, the audio quality using this method is above 30 db and files can be extracted watermark with the BER (Bit Error Rate) = 0%. Echo hiding method in this study has successfully passed the resampling attack, the addition of noise, and multiple watermarking with the same watermark and method. Echo hiding method does not make it past cropping attack, time stretching, and multiple watermarking using the same methods and different watermark. Audio watermarking technique using echo hiding method in this study are implemented using Matlab 7.7.0.
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Judul: Implementasi Audio Watermarking Menggunakan Metode DWT-SVD dengan Teks sebagai Watermark
Abstrak: The growth of data and network communication technologies has made digital data, such as audio, easier to be distributed illegally. Therefore, copyright protection becomes an important issue. Digital audio watermarking has been proposed as one of the possible solutions. It is a process of information insertion and extraction to and from an audio file without influencing the audio quality. Digital audio watermarking has been developed in several domains, such as time domain, frequency domain, and spatial domain. In this research, the audio watermarking has been implemented using DWT-SVD method that combines the frequency and spatial domain. This method works by combining the virtue of mathematical transform: the discrete wavelet transform (DWT) and singular value decomposition (SVD). Perceptibility and robustness of this method were analyzed using variance of watermark intensity and several attacks. It was found that the watermarked audio has good perceptibility at low watermark intensity of 0.1 to 0.3. Furthermore, the watermarked audio was found to be robust to some attacks namely amplify, invert, low pass filtering, high pass filtering, and resampling attacks at higher watermark intensity. Thus, this research proved the trade-off between perceptibility and robustness in digital audio watermarking.
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Judul: Trichosanthes (Cucurbitaceae) In Malesia
Abstrak: Trichosanthes L. merupakan marga terbesar yang tergolong dalam suku Cucurbituceae. Marga tersebut beranggotakan sekitar 100 jenis, tersebar di Asia bagian timur, Malesia, Australia tropik sampai ke Fiji. Beberapa jenis anggotanya mempunyai nilai ekonomi sebagai bahan obat tradisional maupun sayuran, bahkan Cina telah mengembangkaa T. kirilowii, guna mendapatkan zat bioaktif yang dapat digunakan untuk menggugurkan kandungan bahkan sebagai bahan anti HIV.
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