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Journal : TELKOMNIKA (Telecommunication Computing Electronics and Control)

PERANCANGAN SISTEM KALENDER HIJRIAH ELEKTRONIS BERBASIS MIKROKONTROLER AT89S51 Iswanjono Iswanjono; Ahlusi Sunnah; Tole Sutikno
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 4, No 2: August 2006
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v4i2.1254

Abstract

            Sistem kalender Hijriah merupakan sistem kalender umat Islam, yang pergantian harinya terjadi pada waktu Maghrib. Sistem kalender Hijriah yang beredar di Indonesia kebanyakan berupa kertas tercetak dan sulit dijumpai yang berbasis elektronis. Penelitian ini bertujuan menyediakan sistem kalender Hijriah elektronis untuk dipergunakan di masjid, musholah dan kantor-kantor berbasis islam. Sistem kalender Hijriah elektronis yang dilakukan pada penelitian ini dirancang berbasis mikrokontroler AT89S51. Informasi waktu (berupa jam, menit, detik) dan kalender Hijriah (berupa hari, tanggal, bulan, tahun) dibangkitkan oleh sistem RTC-1287 (Real Time Clock berbasis IC DS12887) yang tetap dapat bekerja walaupun sumber daya tidak terhubung, karena adanya baterai yang bekerja di dalam chip tersebut. Berdasarkan hasil pengujian didapatkan bahwa sistem kalender Hijriah berbasis mP AT89S51 yang dirancang dapat digunakan sebagai sistem kalender Hijriah elektronis dengan keakuratan yang tinggi.
An Algorithm for Predicting the Speed of Traffic Light Violators Iswanjono Iswanjono; Bagio Budiardjo; Kalamullah Ramli
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 9, No 1: April 2011
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v9i1.645

Abstract

The tracking of vehicles using RFID was developed consider three major problems, i.e. traffic signal timing, congestion on road and theft of vehicles. This paper describes an algorithm for predicting the speed of traffic light violators. The novel algorithm is implemented in the form of a simulation program. The traffic light system is equipped RFID reader as the main tool for identifying the vehicle’s RFID tags. In the simulation, the vehicle’s ID is generated using a random number generation. The distribution of the vehicle’s numbers is uniform and the expected number of vehicles violated the traffic light is not more than 3 % of the total number generated. The timing accuracy for speed traffic lights violator is 100 milli seconds. From the simulation conducted, the algorithm has performed as expected. It is able to predict the speed of traffic light violators ranging from 5 km/h up to 80 km/h in real-time.
Feature Extraction of Musical Instrument Tones using FFT and Segment Averaging Linggo Sumarno; I. Iswanjono
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 3: September 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v15i3.3381

Abstract

A feature extraction for musical instrument tones that based on a transform domain approach was proposed in this paper. The aim of the proposed feature extraction was to get the lower feature extraction coefficients. In general, the proposed feature extraction was carried out as follow. Firstly, the input signal was transformed using FFT (Fast Fourier Transform). Secondly, the left half of the transformed signal was divided into a number of segments. Finally, the averaging results of that segments, was the feature extraction of the input signal. Based on the test results, the proposed feature extraction was highly efficient for the tones, which have many significant local peaks in the Fourier transform domain, because it only required at least four feature extraction coefficients, in order to represent every tone.