Anti-Echo Amplifier Using Micro-Controller

Nurafni, Ibrahim (2005) Anti-Echo Amplifier Using Micro-Controller. Project Report. Melaka, Malaysia, UTeM. (Submitted)

	PDF (24 Pages) Anti-Echo_Amplifier_Using_Micro-Controller_-_Nurafni_bt_Ibrahim_-_TK6565.A55.N87_2005_24_Pages.pdf - Submitted Version Download (1MB)
	PDF (Full Text) Anti-Echo_Amplifier_Using_Micro-Controller_-_Nurafni_bt_Ibrahim_-_TK6565.A55.N87_2005.pdf - Submitted Version Restricted to Registered users only Download (11MB)

Abstract

This is the project of Anti-echo Amplifier Using Micro-controller. This project is purposely to eliminate or reduce the feedback from a microphone. A simple P A (public address) system consists of a microphone, an amplifier, and one or more speakers. Whenever those three components are being used, they have potential for feedback. Feedback is occurred when the sound from the speakers makes it back into the microphone and is re-amplified and sent through the speaker again. This process continues and the result is a loud noise out of the speaker. This phenomenon often happened in a Public Address (PA) System. So, this project attempts to reduce or eliminate the problem by introducing a. delay between the microphone inputs to the speaker output by means of a micro-controller. This project consists of hardware and software. The part that consists for the hardware is electronic circuits especially in amplifier design. These electronic circuits are combined with the micro-controller circuit, PIC. The PIC program is the software part. It plays the most important role in this project where the main operations are to process the voice signal, record and playback the signal through Digital-to-Analog Converter. In recording process, the operations that involved are to read the data and store the data into RAM for a period of time. At this stage, the delay is created. As a result, this project is· able to eliminate or reduces the loud echo caused by a feedback from microphone. When the microphone is placed near to the speaker, no echo sounds is produced.

Actions (login required)

View Item