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    Analisis Perbandingan Zero Compresion Dengan Difference Coding Pada Kompresi File Audio

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    Chapter III-V (669.0Kb)
    Chapter II (888.7Kb)
    Chapter I (457.3Kb)
    Abstract (445.9Kb)
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    Date
    2014-11-22
    Author
    Triajiwati, Dessy Febriani
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    Abstract
    The Size of .wav audio file format in particular is relatively large compared with the text format file, which requires a large memory to perform in terms of storage and transmission (delivery) through the medium of communication. This greatly affects the availability of a place (space) as well as data processing, especially the audio data . so it is necessary to develop applications for data compression that aims to minimize memory by using Zero Compression Algorithm and Difference Coding. At Zero Compression method, the compression of audio files is done on the audio sample which has a value of zero sequentially .There are two main stages of compression using Zero compression method for audio data, that is reading redudance the data and coding. Reading redudance the data is representing the frequency of occurrence of each audio sample into exact numbers, while coding is to write code that contains the value of the sample with the frequency of occurrence. While the method of Difference Coding compression is data that difference is a reduction in the value of an audio sample with previous audio sample values and coding. Wav file compression Results with both algorithms above can give you a smaller file size that is used Zero Compression algorithms with an average compression ratio about 24.43% and 25.48% Difference Coding is.
     
    Ukuran file audio khususnya berformat.Wav relatif besar dibandingkan file dengan format teks,yang membutuhkan memori yang besar dalam melakukan penyimpanan maupun dalam hal transmisi (pengiriman) melalui media komunikasi. Hal ini sangat mempengaruhi ketersediaan tempat (space) maupun pengolahan data khususnya data audio.Untuk itu perlu dikembangkan aplikasi untuk kompresi data yang bertujuan untuk minimalisasi memori menggunakan algoritma Zero Compression dan Difference Coding. Pada metode Zero Compression, kompresi file audio dilakukan pada sampel audio yang bernilai nol (0) berurutan. Ada dua tahap utama kompresi dengan metode Zero Compression untuk data audio, yaitu reading redudance data dan coding. Reading redudance data adalah merepresentasikan frekuensi kemunculan setiap sampel audio kedalam bilangan eksak sedangkan Coding adalah menuliskan kode yang berisi nilai sampel dengan frekuensi kemunculannya.Sedangkan kompresi dengan metode Difference Coding adalah data difference yaitu adalah pengurangan nilai sampel audio dengan nilai sampel audio sebelumnya serta coding. Hasil kompresi file wav dengan kedua algoritma di atas dapat memberikan ukuran file yang lebih kecil yaitu dengan algoritma Zero Compression rata-rata rasio kompresi sebesar 24.43 % dan Difference Coding adalah 25.48 %.
     
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    http://repository.usu.ac.id/handle/123456789/42385
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