| Summary: | 碩士 === 國立交通大學 === 電機與控制工程系 === 90 === Abstract
The earliest multichannel reproduction system format was brought up for theatre by Dolby Liboratories Inc in 1950s. The main difference between the conventional stereo (two or three dimension) and multichannel sound system is the setup of surround sound channel. The main purpose of surround channel is to produce the effect of liveness, sense of envelopment, and wide spatiality.
There exist many methods for audio channel separation in nowaday’s hardware and software techniques. Most of them used simple filters (low/high/band pass) to reach channel separation, but this kind of method is quite rough. In order to get a correct separation solution, we use the concept of Dolby Surround decoding in our research.
In this thesis, what we engaged is about room effect simulation. Based on the definition of surround sound referred to Dolby Liboratories Inc., we generate different quality of audio sound sources by a room effect emulator, and then turn the conventional stereo into 5.1 channel sound system by a modified Dolby Surround decoder. We further introduce the concept of room effect impulse response in different room-dimension, and use multi-bands equalizer to generate many kinds of music impression for the multichannel sound system. In this way, we can get a full and a live listening experience.
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