Intelligent audio control in home entertainment

• Main Author: Chu, Ser How.
• Other Authors: Gan Woon Seng
• Format: Final Year Project
• Language: English
• Published: 2012
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Home entertainment systems
• Online Access: http://hdl.handle.net/10356/47709
• Institution: Nanyang Technological University

Digital audio is introducing a bold new sound in consumer audio and home theater systems. Several factors are converging to bring high-end, surround sound audio to mass market buyers: the rise of the DVD and BluRay, new formats for multichannel audio, and widespread use of digital signal processors (DSPs) in audio systems. This project looks into the exciting area of using signal processing to enhance the performance of surround speakers. This system automatically measures and corrects the acoustics of the multichannel sound system for the specific room where the system is being set up, compensating for non-ideal room acoustics, loudness of program and speaker response. For many home entertainment systems that consumer use, the ability to reproduce sound quality of cinema theatre at a relatively low cost is a challenge task. Problems such as incorrect gain, incorrect frequency response and room acoustics response and poor speaker quality are some of the criteria that make a difference between home system and cinema system. For the purpose of this project, the author was more focus on controlling gain based on the noise level of the room. Two applications were developed by the user.  Intelligent Voice Dimmer (Require Items: Matlab 7.0, Microphone, Visual Basic and Comm Port wire)  Audio Location Broadcasting (Require Items: Infrared Ray/Radio Frequency/Ultrasonic Wave Sensor and Ceiling Speakers) Both the applications were developed using Analog Device’s VisualDSP++5.0 Integrated Development and Debugging Environment for Blackfin Processors. The FIR filters were designed using MATLAB’s FDATool. The applications were tested on the BF-561 EZKIT Lite board provided by Analog Devices.