Development of the Mobile Application for Equalization of Digital Audio System

Abstract

Digital audio is technology that can be used to record, store, generate, manipulate, and reproduce sound using audio signals encoded in digital form. A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. Graphic equalizers are often included in consumer audio equipment and software which plays music on home computers. In the graphic equalizer, the input signal is sent to a bank of filters. The digital audio system for concert in opera theater or concert hall must be installed a lot of speaker units. Also, the speaker units are installed at intervals in a theater. And the audio systems must be controlled by the kinds of concert for the best sound quality. As that result, the user needs the remote control in order to play the audio system according to the kinds of concert in opera theater or concert hall efficiently in real-time. In this paper, we implement the mobile application for the remote control using wireless communications to control the digital audio system. Also, we implement the crossover and equalizer of the digital audio system. Each GEQ (Graphic EQualizer) Vertical Seek Bar is used. It has the frequency range value from -15.0 to 15.0 and the frequency range value is divided in units of 0.5 such as -15.0, -14.5, -14.0 …. 14.0, 14.5, and 15. And the 31Vertical Seek Bars are used for controlling each frequency range of volume. Also they are represented by graphic user interface for easy operation of user.