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Riko Arlando Saragih
Universitas Kristen Maranatha
Religion Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Journal : JURNAL TEKNOLOGI TECHNOSCIENTIA

 1 
PENGENALAN POLA SINYAL SEISMIK GUNUNG MERAPI DENGAN ALIHRAGAMGELOMBANG-SINGKAT Saragih, Riko Arlando
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.2012

Abstract

In most communication systems, speech was transmitted in narrowband frequency, mainly at frequency 300 Hz to 3400 Hz. Therefore, the frequencies outside this narrow bandwidth were lost. The lost frequencies can cause bias articulation in some speech.Bandwidth expansion is one technique to overcome this problem. Many bandwidth expansion techniques have been developed to increase the speech signal bandwidth on communication channels through envelope aliasing, nonlinear processing, and linear mo-del of human speech processing. Artificial Bandwidth Expansion (ABE) is one of the bandwidth expansion techniques to increase speech signal sampling frequency (upsampling) from 8 kHz to 16 kHz. The process annexes extra spectral components which are the images of the low frequency spectral components (narrowband) in the higher frequency segment. This method works frame by frame and each frame is 30 ms long and 5 ms overlapping with the adjacent frames. In this research, every frame was classified using Hidden Markov Model (HMM) and stated as sibilants or fricative consonants or stop consonants and treated separately (attenuated or amplified) according to the classification results.Comparison tests were done in this research based on the audio perceptions of so-me responders. Based on the results, it was acknowledged that the quality of the speech signal was significantly improved although some distortions were somewhat object-ttionable.
Co-Authors Aan Darmawan Aan Darmawan Hangkawidjaja Aan Darmawan Hangkawidjaja Agus Prijono Anang Kristianto Daniel Setiadikarunia Elia Moses Erwani Merry Sartika Herawati Yusuf Herawati Yusuf Heri Andrianto Ikuthen Gabriel Barus Judea Janoto Jarden Mohamad Hafiz Gema Takbir Akbar Moses, Elia Novie Theresia Br. Pasaribu Novie Theresia Br. Pasaribu Oktafiandi, Aulia Rashif Ilmi Nurzaman Ratnadewi . Ratnadewi, Ratnadewi Roy Rikki Hutahean Ruben Stefanus Sunoto, Tio Dewantho Tio Dewantho Sunoto Tio Dewantho Sunoto Wijaya, Kioe (Oeij) O. K. Ricky Yohana Susanthi Yosafat Aji Pranata